| Title of Invention | AN APPARATUS AND METHOD FOR GENERATION OF STEAM |
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| Abstract | There is proposed an improved boiler for generation of steam from water comprising a steam drum for storing water and provided with the conventional steam separation auxiliaries, said drum being connected to a second heat exchanger in a secondary heat exchanger so as to allow the water to flow through in natural circulation and to absorb heat from a first heat exchanger (in the said secondary heat exchanger) for circulating hot intermediate fluid in a closed loop through a primary heat exchanger thereby enabling the first heat exchanger within the secondary heat exchanger to deplete its heat to the secondary heat exchanger, the primary heat exchanger being located within the conventional combustor of furnace and a method for generating steam from water. |
| Full Text | THE PATENT ACT, 1970 COMPLETE SPECIFICATION (SECTION-10) TITLE “FAIL SAFE BOILER” APPLICANTS M/S. THERMAX LTD., D-13, MIDC Industrial Area, Chinchwad, Pune - 411 019 Maharashtra, an Indian Company. The following specification particularly describes and ascertains the nature of this invention and the manner in which it is to be performed. FAIL SAFE BOILER INTRODUCTION TO THE FIELD OF INVENTION This invention relates to novel boiler construction. This invention more particularly relates to the development of a new configuration of a boiler/steam generator in which the steam generating tubes would not fail/rupture on account of overheating due to scaling or low water condition or no water condition in the boiler. PRIOR ART AND DRAWBACKS It is already known in the prior art to generate steam, using heat in the flue gases generated due to combustion of fuels. In these conventional boilers, it is known to generate steam by exchange of heat from hot gases, produced by burning fuels, directly to either soft or de-mineralized (DM) water. It is also known that in these conventional boilers the water softener/DM plant has to be maintained and operated continuously to ensure the safety of the boiler pressure parts. Also in these conventional boilers, the steam generating heat transfer surfaces are subjected to varying heat fluxes. The main limitation of the prior art is the requirement of stringent water quality as either commercial zero hardness or DM water. Another limitation of the prior art is to maintain a desired water level to prevent dry out conditions of the boiler/steam generator. Not maintaining the same would result in tube failure due overheating on account of scaling. Yet another limitation of the prior art is that online water side cleaning is not possible. OBJECTS OF THE INVENTION It is the principal object of this invention to propose a new design of fail safe boiler. It is another object of this invention is to propose the use of an intermediate fluid which primarily absorbs/exchange the heat with the hot gas produced by combustion of fuels. It is another object of this invention is to propose such a boiler in which this intermediate fluid is in a closed loop circuit thus avoiding low water/no water conditions at any point of operation of the unit. 2 It is also an object of this invention to propose such a heat exchanger in which the heat absorbed/exchanged by the intermediate fluid is rejected to the water /steam in new heat exchanger/steam generator to generate steam. It is another object of this invention to propose a new heat exchanger/steam generator in which, the above said intermediate fluid rejects heat at a high heat transfer coefficient in the range of 400 to 3000 Kcal/m20C. It is yet another object of the invention to propose a new heat exchanger/steam generator in which the temperature of the heating media can never exceed 400 ° C and hence the metal temperature will always be under permissible limits even in case of bad water quality or low water level or no water in the boiler. BRIEF STATEMENT OF THE INVENTION According to this invention there is provided an improved boiler for generation of steam from water comprising a steam drum for storing water and provided with the conventional steam separation auxiliaries, said drum being connected to a second heat exchanger in a secondary heat exchanger so as to allow the water to flow through in natural circulation and to absorb heat from a heat exchanger (In the said secondary heat exchanger adapted) for circulating hot intermediate fluid in a closed loop through a primary heat exchanger thereby enabling the first heat exchanger within the secondary heat exchanger to deplete its heat to the medium in the secondary heat exchanger, the primary heat exchanger being located within the conventional combustor of furnace. The secondary heat exchanger is a tube in tube or shell and tube type. According to another feature of this invention there is provided a method for generating steam from water which comprises passing the water from a drum through a second heat exchanger, absorbing the heat from a first heat exchanger in the said secondary heat exchanger, from an intermediate fluid passed through the said first heat exchanger in closed loop with a primary heat exchanger, the said primary heat exchanger being adopted to absorb heat from the combustor/furnace, the said drum being provided with conventional auxiliaries to separate water from steam. 3 BRIEF DESCRIPTION OF THE DRAWINGS In accompanying figure 1 of the drawings we have described schematically the new configuration for boilers. DETAILED DESCRIPTION OF THE DRAWINGS It wilt be seen from the accompanying drawing that; Figure 1 shows the schematic of the proposed system. (1) Is the normal known combustor/furnace, capable of burning fuels. Primary heat exchanger (2) is enclosed in heat exchanger (2). The hot exhaust gases then exchanges heat in a primary heat exchanger (2), which is integral with the combustor (1). The intermediate fluid (air, water, organic/inorganic liquids) is heated in the primary heat exchanger (2). This intermediate fluid is in a closed loop circuit with another heat exchanger/boiler (3), which is natural circulation with drum (4) where it rejects heat to the water and thus generating steam. This heat exchanger (3) can be a single unit or several modular units connected in series or parallel. It will thus be seen that there is also provided a novel method for generating steam from the exhaust gas of combustion furnace. Thus a new method comprises absorbing the heat from the combustor near primary heat exchanger having intermediate fluid in closed loop, allowing said intermediate fluid to dispense the heat absorbed from the exhaust gas stem to a secondary heat exchanger or ate me generator, the intermediate fluid depleted of its heat being re circulated to the primary heat exchanger in a closed loop, the second heat exchanger positioned in the secondary heat exchanger receiving water in natural circulation from a drum such that the water from the drum flows to the second heat exchanger, absorbing the heat depleted by the intermediate fluid flowing in closed loop, said absorbed heat being capable of converting the water into steam, the resulting water steam mixture being circulated to the drum where steam is separated in a conventional manner and the separated water is re circulated in natural circulation while necessary water being fed to the drum to make up for the losses in the generation of the steam. The secondary heat exchanger is explained in more detail in figure 2 of the accompanying drawings. Thus the secondary heat exchanger has a first exchanger for passing the hot intermediate fluid to exchange heat to the common medium in the second heat exchanger, the secondary heat exchanger also having a second heat exchanger for absorbing heat form the medium in the secondary heat exchanger. 4 WE CLAIM 1) An improved boiler for generation of steam from water comprising a steam drum for storing water and provided with the conventional steam separation auxiliaries, said drum being connected to a second heat exchanger in a secondary heat exchanger so as to allow the water to flow through in natural circulation and to absorb heat from a first heat exchanger (In the said secondary heat exchanger adapted) for circulating hot intermediate fluid in a closed loop through a primary heat exchanger thereby enabling the first heat exchanger within the secondary heat exchanger, to deplete its heat to the secondary heat exchanger, the primary the primary heat exchanger being located within the conventional combustor of furnace. 2) An improved boiler for generator of steam as claimed in Claim 1 where the secondary heat exchanger is a tube in tube or shell and tube type. 3) A method for generating steam from water which comprises passing the water from a drum through a second heat exchanger in a secondary heat exchanger, absorbing the heat from a first heat exchanger in the said secondary heat exchanger from an intermediate fluid being passed through the said first heat exchanger in closed loop with a primary heat exchanger, the said primary heat exchanger being adopted to absorb heat from the combustor/furnace, the said drum being provided with conventional auxiliaries to separate water from steam. 4) An improved boiler for generation of steam from water substantially as herein described with reference to the accompanying drawings. 5) A method for generating steam from water substantially as herein described. DATED THIS THE DAY OF 2005. 5 ABSTRACT OF THE INVENTION Title: Fail Safe Boiler. There is proposed an improved boiler for generation of steam from water comprising a steam drum for storing water and provided with the conventional steam separation auxiliaries, said drum being connected to a second heat exchanger in a secondary heat exchanger so as to allow the water to flow through in natural circulation and to absorb heat from a first heat exchanger (in the said secondary heat exchanger) for circulating hot intermediate fluid in a closed loop through a primary heat exchanger thereby enabling the first heat exchanger within the secondary heat exchanger to deplete its heat to the secondary heat exchanger, the primary heat exchanger being located within the conventional combustor of furnace and a method for generating steam from water. 6 |
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549-MUM-2005-ABSTRACT(4-5-2005).pdf
549-MUM-2005-ABSTRACT(5-9-2008).pdf
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549-MUM-2005-CANCELLED PAGES(2-2-2009).pdf
549-MUM-2005-CANCELLED PAGES(5-9-2008).pdf
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549-MUM-2005-CLAIMS(CANCELLED PAGES)-(5-9-2008).pdf
549-MUM-2005-CLAIMS(GRANTED)-(9-3-2008).pdf
549-MUM-2005-CORRESPONDENCE 1(29-4-2005).pdf
549-MUM-2005-CORRESPONDENCE(2-2-2009).pdf
549-MUM-2005-CORRESPONDENCE(5-9-2008).pdf
549-MUM-2005-CORRESPONDENCE(IPO)-(30-3-2009).pdf
549-mum-2005-description (complete).pdf
549-MUM-2005-DESCRIPTION(COMPLETE)-(2-2-2009).pdf
549-MUM-2005-DESCRIPTION(COMPLETE)-(4-5-2005).pdf
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549-MUM-2005-DRAWING(5-9-2008).pdf
549-MUM-2005-DRAWING(AMENDED)-(5-9-2008).pdf
549-MUM-2005-DRAWING(GRANTED)-(9-3-2008).pdf
549-MUM-2005-FORM 1(5-9-2008).pdf
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549-MUM-2005-FORM 2(COMPLETE)-(4-5-2005).pdf
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549-MUM-2005-FORM 2(TITLE PAGE)-(4-5-2005).pdf
549-MUM-2005-FORM 2(TITLE PAGE)-(5-9-2008).pdf
549-MUM-2005-FORM 2(TITLE PAGE)-(GRANTED)-(9-3-2008).pdf
549-MUM-2005-FORM 26(5-9-2008).pdf
549-MUM-2005-SPECIFICATION(AMENDED)-(5-9-2008).pdf
| Patent Number | 231722 | ||||||||||||
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| Indian Patent Application Number | 549/MUM/2005 | ||||||||||||
| PG Journal Number | 13/2009 | ||||||||||||
| Publication Date | 27-Mar-2009 | ||||||||||||
| Grant Date | 09-Mar-2009 | ||||||||||||
| Date of Filing | 04-May-2005 | ||||||||||||
| Name of Patentee | THERMAX LIMITED | ||||||||||||
| Applicant Address | D-13,MIDC INDUSTRIAL AREA, CHINCHWAD, PUNE-411 019 | ||||||||||||
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| PCT International Classification Number | F22B37/78 | ||||||||||||
| PCT International Application Number | N/A | ||||||||||||
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