Title of Invention	"A DRY-TYPE DUST CATCHER WITH HEAT EXCHANGER USED FOR BLAST FURNACE"
Abstract	A dry-type dust catcher with a heat exchanger used for a blast furnace, comprises rough dust-cleaning apparatus (1), heat exchanger (2), fine dust-cleaning apparatus (3), valves and pipelines. It is equipped with pipeline (4) connected to the hot blast stove of the blast furnace or boiler system, which can transfer the heat from hot air or flue gas with high temperature to the air with dust to be removed to avoid dewing. In order to reduce the requirements on manufacturing the heat exchanger, valve (5) for mixing air is set on pipeline (4) to avoid the maximum temperature in the heat exchanger not too high by adding part of air with room temperature. Intake valve (6) and induced draught fan (7) can also be set for directing the natural wind into the heat exchanger to lower the temperature of the air with dust to be removed when necessary.

Title of Invention

"A DRY-TYPE DUST CATCHER WITH HEAT EXCHANGER USED FOR BLAST FURNACE"

Abstract

A dry-type dust catcher with a heat exchanger used for a blast furnace, comprises rough dust-cleaning apparatus (1), heat exchanger (2), fine dust-cleaning apparatus (3), valves and pipelines. It is equipped with pipeline (4) connected to the hot blast stove of the blast furnace or boiler system, which can transfer the heat from hot air or flue gas with high temperature to the air with dust to be removed to avoid dewing. In order to reduce the requirements on manufacturing the heat exchanger, valve (5) for mixing air is set on pipeline (4) to avoid the maximum temperature in the heat exchanger not too high by adding part of air with room temperature. Intake valve (6) and induced draught fan (7) can also be set for directing the natural wind into the heat exchanger to lower the temperature of the air with dust to be removed when necessary.

Full Text	Dry typo dust catcher With Heat Exchanger Uaod For Blast Furnace- Technical field The present invention relates to a dry-type dust catcher with a heat exchanger used for a blast furnace. Technology background A dry-type dust catcher used for a blast furnace earnestly needs to be widely used for its great social and economic benefits in saving water and energy. Normally, a dry-type dust catcher consists of a rough dust-cleaning apparatus, a heat exchanger and a bag dust remover as representatives of a gravitational precipitator or a cyclone dust remover, or consists of a fine dust-cleaning apparatus and valves of pipelines as representatives of an electric dust remover. The heat exchanger set for this type of dust catcher is used to heat the temperature of the air with dust to be removed to prevent the fine dust-cleaning apparatus from malfunction due to dew formation, and cool the temperature of the air with dust to be removed to prevent the bag from being burned or the electric dust remover from over deformed and thus resulting in malfunction. The main shortcomings of the present device lie in that the high temperature heat source heating the air with dust to be removed is especially to be set and may definitely raise costs of investment, operation and maintenance as well as energy consumption. Besides, the device is used only when the blast furnace works under unusual conditions, which also means a higher cost, but in order to ensure the normal work of the system, employing the device is little more economic than running a wet method dust catcher. Contents of the invention The purpose of the invention is to provide a dry-type dust catcher used for a blast furnace, equipped with a heat exchanger but not an especially fixed high temperature heat source. The basic principle of the present invention is that the heat energy taken directly from a hot blast stove system of a blast furnace or a flue gas system of a boiler is provided to a heat exchanger. More specifically, a pipeline is set to connect said heat exchanger with the blast furnace and/or the flue gas system of the boiler, i.e., the pipeline connects to both the flue gas system of the boiler and the channel of exhaust flue gas of the blast furnace, in addition to connect to the hot air passage of the blast furnace, moreover, it can connect to two parts from the three at the same time and connections get controlled by valves. Certainly, it is feasible to connect the pipeline with all three parts, but it is not necessary for the sake of economy. The heat from hot air or flue gas with high temperature is transferred to the air with dust to be removed through the heat exchange in the heat exchanger. In order to avoid the operation of the device being influenced by the too low flue gas temperature or the abnormal running of the heat source, a combustion apparatus can be attached thereon and the produced flue gas with high temperature can enter pipelines so as to ensure the temperature of the supplied air entering the heat exchanger to be maintained within a rational range through controlling the combustion intensity of the combustion apparatus. When the hot air from the hot blast stove is used as a heat source, a valve for mixing air can be set in the hot air passage to mix part of the air with the room temperature and control the maximum temperature in the heat exchanger not to go too high, in order to lower the requirements on manufacturing the heat exchanger. Meanwhile, when the hot air is used as a heat source, the remaining heat of the tail gas from the heat exchanger can also be utilized, e.g., to sent it into the combustion-supporting air pipeline for further use, etc.. When the temperature of the air with dust to be removed needs to be lowered, the natural air is added to the heat exchanger through a induced draught fan. Certainly, the water-cooled mode is another option. Merits of the present invention are: 1. the especially set high-temperature heat source is omitted for saving the investment, space, costs of the operation and maintenance, and the energy source, especially when the device is rarely used; 2. the potentialities of the hot blast stove can be fully utilized; 3. fast start-up, short temperature lagging time and rapid response, etc., are other advantages of the device. Description of drawings The present invention is attached with two pages of drawings and four figures in total, wherein, Fig. 1, Fig. 2 and Fig. 3 are schematic diagrams for showing structures of Embodiment 1, Embodiment 2 and Embodiment 3 respectively; Fig. 4 is a schematic diagram showing the heat supply passage connecting with two heat sources simultaneously. Further explanation is given below in combination with the attached drawings: Fig. 1 represents Embodiment 1 of a dry-type dust catcher with a heat exchanger used for a blast furnace, wherein, [1] is the rough dust-cleaning apparatus of the present dry-type dust catcher, which can be a gravitational precipitator or a cyclone dust remover, etc.; [2] is the heat exchanger in the present dry-type dust catcher; [3] is the fine dust-cleaning apparatus in the present dry-type dust catcher, which can be a bag dust remover or an electric dust remover; [4] is the pipeline leading to heat exchanger [2] and supplying it with heat; [5] is the control valve in pipeline [4]; [6] and [7] are the entrance and exit of the air with dust to be removed in the present dry-type dust catcher, respectively; [8] and [9] are valves to control the flow direction of the air with dust to be removed of the present dry-type dust catcher; [10] is the exit of the remaining gas from the hot air supplying the heat exchanger with heat. When the control system in the dry-type dust catcher warns the dew formation, valve [9] must be closed immediately and valve [8] should be opened. Meanwhile, valve [5] should also be opened to make the hot air or the pressurized flue gas or the flue gas from the boiler be provided with heat to heat exchanger [2] through pipeline [4], so as to complete heating the air with dust to be removed. Embodiment 2 shown in Fig.2 is improved Embodiment 1. Combustion apparatus [18] is set on pipeline [4] leading to heat exchanger [2] and supplying it with heat to make the produced flue gas with high temperature enter said pipeline [4], so as to ensure the temperature of the air entering the heat exchanger for supplying heat to be kept within a rational range through controlling the combustion intensity of the combustion apparatus. Setting a combustion apparatus can be applied to various embodiments in the present invention. It can heat the exhaust air in the hot blast stove or the boiler when the temperature of it is too low, in addition to deal with the stop supplying of hot air because of the dysfunction of the heat source. Embodiment 3 shown in Fig. 3 is also improved Embodiment 1. It adds with valve [11] for mixing air, through which part of cold air can be supplied to pipeline [4] to control the maximum temperature of the hot air in heat exchanger [2] not to exceed a certain predetermined value when the hot air is provided, and thus to avoid additional manufacturing requirements and higher cost due to adding a heat exchanger and related elements. A cold air entrance and its valve [12], and induced draught fan [14] and its valve [13], are also added with for lowering the temperature of the air with dust to be removed. In this way, cooling the air with dust to be removed can be implemented through opening valves [12] and [13], closing exit [10] for exhaust gas and starting up induced draught fan [14] after the control system in the dry-type dust catcher warns a high temperature. The addition of induced draught fan [14] can bring about another effect, i.e., when the flue gas from the hot blast stove or the flue gas from the boiler supply the heat to the heat exchanger, said flue gas can be taken out directly from the induced draught fan so as to avoid a pressurization toward it. Fig. 3 is a schematic diagram of pipelines showing the heat-supply pipe connecting with two heat sources simultaneously, wherein, pipeline [4] has branch point [17]: one branched pipeline from it connects to a heat source through valve through valve [15] and the other connects to the another heat source through valve [16]. In this way, it is possible to determine the point of taking air through the opening and closing of valve [15] and valve [16]. In other words, it is easy to select a heat source to supply heat in a flexible way. Moreover, part of pipelines can be in a common use, thereby resulting in a lower cost. Concrete implementing modes When implementing the present invention, it is suggested only using its function of heating the air with dust to be removed, and connecting the pipeline transferring the thermal media with the hot air pipeline; using the higher temperature of the hot air to reduce the size of the heat exchanger, which may help to save the investment. Further, when the temperature of the air with dust to be removed is too high, other modes such as, spraying water, can also be used for the resolution. WE CLAIM: 1. A dry-type dust catcher with a heat exchanger used for a blast furnace, comprises: a rough dust-cleaning apparatus, a heat exchanger, a fine dust-cleaning apparatus, valves and pipelines, characterized in that said heat exchanger (2) is equipped with pipeline (4) connected to a hot blast stove system of a blast furnace and / or a flue gas system of a boiler. 2. The dry-type dust catcher as claimed in claim 1, wherein said pipeline (4) connects to a hot air pipeline of said blast furnace. 3. The dry-type dust catcher as claimed in claim 2, wherein said pipeline (4) is provided with valve (11) for mixing air. 4. The dry-type dust catcher as claimed in claim 1, wherein said pipeline (4) connects to a flue gas passage of the hot blast stove and is provided with induced draught fan (14). 5. The dry-type dust catcher as claimed in claim 1, wherein said pipeline (4) connects to a flue gas passage of the boiler and is provided with induced draught fan (14). 6. The dry-type dust catcher as claimed in claims 1, 2 or 3, wherein it is provided with valve (12) for controlling the entrance of the natural air and induced draught fan (14). 7. The dry-type dust catcher as claimed in claim 4 or 5, wherein it is provided with valve (12) for controlling the entrance of natural air. 8. The dry-type dust catcher as claimed in claims 1, 2, 3, 4 or 5, wherein said pipeline (4) has branch point (17) and is provided with valves (15) and (16). 9. The dry-type dust catcher as claimed in claims 1, 2, 3, 4 or 5, wherein said pipeline (4) is provided with combustion apparatus (18).

Full Text

Dry typo dust catcher With Heat Exchanger Uaod For Blast Furnace-
Technical field
The present invention relates to a dry-type dust catcher with a heat exchanger used
for a blast furnace.
Technology background
A dry-type dust catcher used for a blast furnace earnestly needs to be widely used for its great social and economic benefits in saving water and energy. Normally, a dry-type dust catcher consists of a rough dust-cleaning apparatus, a heat exchanger and a bag dust remover as representatives of a gravitational precipitator or a cyclone dust remover, or consists of a fine dust-cleaning apparatus and valves of pipelines as representatives of an electric dust remover. The heat exchanger set for this type of dust catcher is used to heat the temperature of the air with dust to be removed to prevent the fine dust-cleaning apparatus from malfunction due to dew formation, and cool the temperature of the air with dust to be removed to prevent the bag from being burned or the electric dust remover from over deformed and thus resulting in malfunction. The main shortcomings of the present device lie in that the high temperature heat source heating the air with dust to be removed is especially to be set and may definitely raise costs of investment, operation and maintenance as well as energy consumption. Besides, the device is used only when the blast furnace works under unusual conditions, which also means a higher cost, but in order to ensure the normal work of the system, employing the device is little more economic than running a wet method dust catcher.
Contents of the invention
The purpose of the invention is to provide a dry-type dust catcher used for a blast furnace, equipped with a heat exchanger but not an especially fixed high temperature heat source.
The basic principle of the present invention is that the heat energy taken directly from a hot blast stove system of a blast furnace or a flue gas system of a boiler is provided to a heat exchanger. More specifically, a pipeline is set to connect said heat exchanger with the blast furnace and/or the flue gas system of the boiler, i.e., the pipeline connects to both the flue gas system of the boiler and the channel of exhaust flue gas of the blast furnace, in addition to connect to the hot air passage of the blast furnace, moreover, it can connect to two parts from the three at the same time and connections get controlled by valves. Certainly, it is feasible to connect the pipeline with all three parts, but it is not necessary for the sake of economy. The heat from hot air or flue gas with high temperature is transferred to the air with dust to be removed through the heat exchange in the heat exchanger. In order to avoid the operation of the device being influenced by the too low flue gas temperature or the abnormal running of the heat source, a combustion apparatus can be attached thereon and the produced flue gas with high temperature can enter pipelines so as to ensure the temperature of the supplied air entering the heat exchanger to be maintained within a rational range through controlling the combustion intensity of the combustion apparatus. When the hot air from the hot blast stove is used as a heat source, a valve for mixing air can be set in the hot air passage to mix part of the air with the room temperature and control the maximum temperature in the heat exchanger not to go too high, in order to lower the requirements on manufacturing the heat exchanger. Meanwhile, when the hot air is used as a heat source, the remaining heat of the tail gas from the heat exchanger can also be utilized, e.g., to sent it into the combustion-supporting air pipeline for further use, etc.. When the temperature of the air with dust to be removed needs to be lowered, the natural air is added to the heat exchanger through a induced draught fan. Certainly, the water-cooled mode is another option.
Merits of the present invention are: 1. the especially set high-temperature heat source is omitted for saving the investment, space, costs of the operation and maintenance, and the energy source, especially when the device is rarely used; 2.
the potentialities of the hot blast stove can be fully utilized; 3. fast start-up, short temperature lagging time and rapid response, etc., are other advantages of the device.
Description of drawings
The present invention is attached with two pages of drawings and four figures in total, wherein, Fig. 1, Fig. 2 and Fig. 3 are schematic diagrams for showing structures of Embodiment 1, Embodiment 2 and Embodiment 3 respectively; Fig. 4 is a schematic diagram showing the heat supply passage connecting with two heat sources simultaneously. Further explanation is given below in combination with the attached drawings:
Fig. 1 represents Embodiment 1 of a dry-type dust catcher with a heat exchanger used for a blast furnace, wherein, [1] is the rough dust-cleaning apparatus of the present dry-type dust catcher, which can be a gravitational precipitator or a cyclone dust remover, etc.; [2] is the heat exchanger in the present dry-type dust catcher; [3] is the fine dust-cleaning apparatus in the present dry-type dust catcher, which can be a bag dust remover or an electric dust remover; [4] is the pipeline leading to heat exchanger [2] and supplying it with heat; [5] is the control valve in pipeline [4]; [6] and [7] are the entrance and exit of the air with dust to be removed in the present dry-type dust catcher, respectively; [8] and [9] are valves to control the flow direction of the air with dust to be removed of the present dry-type dust catcher; [10] is the exit of the remaining gas from the hot air supplying the heat exchanger with heat.
When the control system in the dry-type dust catcher warns the dew formation, valve [9] must be closed immediately and valve [8] should be opened. Meanwhile, valve [5] should also be opened to make the hot air or the pressurized flue gas or the flue gas from the boiler be provided with heat to heat exchanger [2] through pipeline [4], so as to complete heating the air with dust to be removed.
Embodiment 2 shown in Fig.2 is improved Embodiment 1. Combustion
apparatus [18] is set on pipeline [4] leading to heat exchanger [2] and supplying it with heat to make the produced flue gas with high temperature enter said pipeline [4], so as to ensure the temperature of the air entering the heat exchanger for supplying heat to be kept within a rational range through controlling the combustion intensity of the combustion apparatus. Setting a combustion apparatus can be applied to various embodiments in the present invention. It can heat the exhaust air in the hot blast stove or the boiler when the temperature of it is too low, in addition to deal with the stop supplying of hot air because of the dysfunction of the heat source.
Embodiment 3 shown in Fig. 3 is also improved Embodiment 1. It adds with valve [11] for mixing air, through which part of cold air can be supplied to pipeline [4] to control the maximum temperature of the hot air in heat exchanger [2] not to exceed a certain predetermined value when the hot air is provided, and thus to avoid additional manufacturing requirements and higher cost due to adding a heat exchanger and related elements.
A cold air entrance and its valve [12], and induced draught fan [14] and its valve [13], are also added with for lowering the temperature of the air with dust to be removed. In this way, cooling the air with dust to be removed can be implemented through opening valves [12] and [13], closing exit [10] for exhaust gas and starting up induced draught fan [14] after the control system in the dry-type dust catcher warns a high temperature.
The addition of induced draught fan [14] can bring about another effect, i.e., when the flue gas from the hot blast stove or the flue gas from the boiler supply the heat to the heat exchanger, said flue gas can be taken out directly from the induced draught fan so as to avoid a pressurization toward it.
Fig. 3 is a schematic diagram of pipelines showing the heat-supply pipe connecting with two heat sources simultaneously, wherein, pipeline [4] has branch point [17]: one branched pipeline from it connects to a heat source through valve through valve [15] and the other connects to the another heat source through valve
[16]. In this way, it is possible to determine the point of taking air through the opening and closing of valve [15] and valve [16]. In other words, it is easy to select a heat source to supply heat in a flexible way. Moreover, part of pipelines can be in a common use, thereby resulting in a lower cost.
Concrete implementing modes
When implementing the present invention, it is suggested only using its function of heating the air with dust to be removed, and connecting the pipeline transferring the thermal media with the hot air pipeline; using the higher temperature of the hot air to reduce the size of the heat exchanger, which may help to save the investment. Further, when the temperature of the air with dust to be removed is too high, other modes such as, spraying water, can also be used for the resolution.

WE CLAIM:
1. A dry-type dust catcher with a heat exchanger used for a blast furnace, comprises:
a rough dust-cleaning apparatus, a heat exchanger, a fine dust-cleaning apparatus,
valves and pipelines, characterized in that said heat exchanger (2) is equipped with pipeline (4) connected to a hot blast stove system of a blast furnace and / or a flue gas system of a boiler.
2. The dry-type dust catcher as claimed in claim 1, wherein said pipeline (4) connects to a hot air pipeline of said blast furnace.
3. The dry-type dust catcher as claimed in claim 2, wherein said pipeline (4) is provided with valve (11) for mixing air.
4. The dry-type dust catcher as claimed in claim 1, wherein said pipeline (4) connects to a flue gas passage of the hot blast stove and is provided with induced draught fan (14).
5. The dry-type dust catcher as claimed in claim 1, wherein said pipeline (4) connects to a flue gas passage of the boiler and is provided with induced draught fan (14).
6. The dry-type dust catcher as claimed in claims 1, 2 or 3, wherein it is provided with valve (12) for controlling the entrance of the natural air and induced draught fan (14).
7. The dry-type dust catcher as claimed in claim 4 or 5, wherein it is provided with valve (12) for controlling the entrance of natural air.
8. The dry-type dust catcher as claimed in claims 1, 2, 3, 4 or 5, wherein said pipeline (4) has branch point (17) and is provided with valves (15) and (16).
9. The dry-type dust catcher as claimed in claims 1, 2, 3, 4 or 5, wherein said pipeline (4) is provided with combustion apparatus (18).

Documents:

3817-DELNP-2006-Abstract-(01-09-2011).pdf

3817-delnp-2006-abstract.pdf

3817-DELNP-2006-Claims-(01-09-2011).pdf

3817-delnp-2006-Claims-(26-09-2014).pdf

3817-delnp-2006-claims.pdf

3817-DELNP-2006-Correspondence Others-(01-09-2011).pdf

3817-delnp-2006-Correspondence Others-(07-08-2014).pdf

3817-delnp-2006-Correspondence Others-(20-06-2011).pdf

3817-DELNP-2006-Correspondence-Others-(13-05-2010).pdf

3817-delnp-2006-Correspondence-Others-(26-09-2014).pdf

3817-delnp-2006-correspondence-others.pdf

3817-delnp-2006-description (complete).pdf

3817-DELNP-2006-Drawings-(01-09-2011).pdf

3817-delnp-2006-drawings.pdf

3817-DELNP-2006-Form-1-(01-09-2011).pdf

3817-delnp-2006-Form-13 (01-09-2011).pdf

3817-delnp-2006-Form-13 (13-05-2010).pdf

3817-delnp-2006-Form-13-(26-09-2014).pdf

3817-delnp-2006-form-18.pdf

3817-DELNP-2006-Form-2-(01-09-2011).pdf

3817-delnp-2006-form-2.pdf

3817-DELNP-2006-Form-3-(01-09-2011).pdf

3817-delnp-2006-Form-3-(20-06-2011).pdf

3817-DELNP-2006-Form-5-(01-09-2011).pdf

3817-delnp-2006-form-5.pdf

3817-delnp-2006-pct-210.pdf

3817-delnp-2006-pct-304.pdf

3817-DELNP-2006-Petition 137-(01-09-2011).pdf

6817-delnp-2006-correspondence-others.pdf

6817-delnp-2006-form-1.pdf

6817-delnp-2006-form-3.pdf

6817-delnp-2006-gpa.pdf

6817-delnp-2006-pct-237.pdf

6817-delnp-2006-pct-326.pdf

6817-delnp-2006-pct-373.pdf

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Patent Number

263750

Indian Patent Application Number

3817/DELNP/2006

PG Journal Number

47/2014

Publication Date

21-Nov-2014

Grant Date

18-Nov-2014

Date of Filing

03-Jul-2006

Name of Patentee

SHANDONG PROVINCE METALLURGICAL ENGINEERING CO. LTD.

Applicant Address

NO. 1969 SHUNHUA STREET, HIGH NEW TECH ZONE, JINAN CITY, SHANDONG PROVINCE, 250101, CHINA

Inventors:

#	Inventor's Name	Inventor's Address
1	YAO, CHAOSHENG	NO. 134, LISHAN ROAD, LIXIA DISTRICT, JINAN, SHANGDONG 250014, CHINA
2	HUANG, DONGSHENG	NO. 134, LISHAN ROAD, LIXIA DISTRICT, JINAN, SHANGDONG 250014, CHINA
3	YI, ZHONGDE	NO. 134, LISHAN ROAD, LIXIA DISTRICT, JINAN, SHANGDONG 250014, CHINA
4	LIU, ZHONGQUAN	NO. 134, LISHAN ROAD, LIXIA DISTRICT, JINAN, SHANGDONG 250014, CHINA
5	QIAN, GANG	NO. 134, LISHAN ROAD, LIXIA DISTRICT, JINAN, SHANGDONG 250014, CHINA
6	WEI, XINMIN	NO. 134, LISHAN ROAD, LIXIA DISTRICT, JINAN, SHANGDONG 250014, CHINA

PCT International Classification Number

B01D 50/00

PCT International Application Number

PCT/CN2005/000515

PCT International Filing date

2005-04-18

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	200420052933.7	2004-08-16	China