RU2610355C1 - Tpp flue gases heat and condensate utilizer - Google Patents

Tpp flue gases heat and condensate utilizer Download PDF

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RU2610355C1
RU2610355C1 RU2015141086A RU2015141086A RU2610355C1 RU 2610355 C1 RU2610355 C1 RU 2610355C1 RU 2015141086 A RU2015141086 A RU 2015141086A RU 2015141086 A RU2015141086 A RU 2015141086A RU 2610355 C1 RU2610355 C1 RU 2610355C1
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Russia
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heat exchanger
flue gases
heat
jacket
utilizer
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RU2015141086A
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Russian (ru)
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Олег Семенович Горфин
Борис Федорович Зюзин
Максим Сергеевич Назаров
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Федеральное государственное бюджетное образовательное учреждение высшего образования "Тверской государственный технический университет"
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00Methods of steam generation characterised by form of heating method
    • F22B1/02Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines

Abstract

FIELD: energy.
SUBSTANCE: invention relates to industrial heat power engineering and can be used in TPP boiling rooms, operating on high humidity solid fuels. Utilizer of heat and condensate of TPP flue gases comprises heat exchanger in form of reservoir, filled with running water, inside of which parallel rows of horizontal tubes are arranged for flue gases movement along them in one direction, connected with jackets, arranged on reservoir end sides, each of which is divided by horizontal flanges into sections, wherein one jacket section upper part is connected with jacket section lower part by pipes, located on reservoir opposite. Utilizer also has gas ducts, smoke exhauster, condensate collector and pipelines. According to invention for tail flue gases temperature control utilizer is equipped with additional second heat exchanger, identical to first one, which reservoirs are interconnected via feeder, wherein output of cooled down, dried flue gases of first heat exchanger from jacket upper section through outlet branch pipe by gas duct is connected to second heat exchanger jacket lower section, and second heat exchanger jacket upper section is connected to stack by gas duct.
EFFECT: technical effect of invention consists in improvement of TPP economic performance and increasing of operation efficiency due to increase efficiency of using recovered "hidden" fuel moisture steam generation heat.
1 cl, 1 dwg

Description

The invention relates to industrial power engineering and can be used in boiler plants of thermal power plants operating on solid fuel of high humidity.
A device for averaging temperature when mixing gas streams with a significant temperature difference. The chimney contains a gas outlet, hot and cold flue gas ducts, a mixing chamber with nozzles located on the side surface, a bypass line with a side flow intake and nozzles. With a decrease in the flow of cold gases through the bypass line, part of the hot flue gas enters an additional collector, from where it goes through the nozzles to the mixing chamber.
The disadvantage of this device is that the hot flue gases entering through the bypass duct contain a pair of sulfuric and sulfuric acids. The temperature of the flue gas mixture is below the dew point of the acids, so condensation of sulfuric and sulfuric acid vapors will occur, which will negatively affect the corrosion resistance of the chimneys and the chimney (SU No. 1799103, Cl. F23J 11/00, 1995).
A condensing boiler plant is known, including a steam boiler with a main gas duct and a bypass gas duct inserted into it, installed on the main gas duct of the boiler, a water economizer, a condensing heat exchanger-utilizer of the heat of the products of fuel combustion, a smoke exhauster and a chimney, as well as a surface heat exchanger, thermal feed water deaerator with a branch pipe for venting the main gas duct. The installation also includes a contact blast heat exchanger-humidifier installed on the blast air supply line to the boiler and connected to a thermal feed water deaerator via a deaerated feed water supply pipe. A surface heat exchanger-utilizer of fuel combustion products is installed on the main gas duct in front of a condensing heat exchanger-utilizer of heat of the combustion products of fuel. The evaporator is connected by pipelines to a condensing heat exchanger-utilizer of heat of the products of combustion of fuel and is installed on the main gas duct in front of it by a surface heat exchanger-utilizer of products of combustion of fuel, forming a circulating circuit of the cooling medium, which is driven by the circulation pump of the cooling medium. The generator is connected by pipelines to the water economizer, forming a circulation circuit of the heating medium, driven by a circulation pump of the heating medium. The absorber and condenser are connected in series with the heated return water pipe of the heating system to the surface heat exchanger. (RU No. 2489643, IPC F22B 33/1, 2013).
The disadvantage of this installation is that the flue gases passing through the bypass duct take away part of the heat of vaporization of the moisture of the fuel, reducing the efficiency of the utilizer. In addition, flue gases contain harmful impurities, such as nitrogen oxides. When chilled flue gases are mixed with gases passing through a bypass duct, the temperature of the mixture rises excluding the possibility of condensation of the remaining moisture vapor of the fuel in the chimney, but it is below the dew point of the acids, upon condensation of which the gases acquire corrosive properties.
The prototype of the claimed is a heat exchanger for the deep utilization of the heat of flue gases of a surface type (RU 2555919, IPC F22B 1/18, 2015), containing gas ducts, a smoke exhauster, a utilizing surface heat exchanger, a condensate collector, pipelines and a bypass duct for regulating the temperature of the tail flue gases. An isolated tank with running water is located in front of the chimney, having shirts on its two end faces, horizontal sections divided into sections. Inside the tank there are horizontal parallel rows of pipes, isolated from the tank and uniting the volumes of the shirts, consisting of separate bundles of pipes in which the flue gases move in one direction. Bundles of pipes alternate with each other in large volumes of sections of shirts that change the direction of movement of flue gases in adjacent bundles. Consistently, the upper part of the section of one shirt is connected by a bundle of pipes to the lower part of the section of the second shirt, and the upper part of this section is connected by a bundle of pipes to the lower part of the next section of the first shirt, thus forming a coil in which bundles of pipes located in the volume of the tank are periodically alternated with large volumes of shirt sections. The bundles of pipes and jacket sections between them form a continuous coil of variable cross-section to move the flue gas flow towards the running water that fills the tank in the upper part and is removed from it from below.
Hot flue gases with a temperature of 150-160 ° C are fed into the heat exchanger in the lower part, moved through the pipes of a coil immersed in a tank with running cooling water, and transfer all the utilized thermal energy of vaporization of fuel moisture contained in them through the metal wall of the pipes of the cooling coil water washing pipes. Cooling water does not come into contact with flue gases; therefore, it can be used without further treatment in the steam turbine cycle. The coil pipes are located directly in the volume of the coolant; therefore, the flue gases are deeply cooled to a temperature of 40-45 ° C. When flue gases are cooled to a temperature of 130-140 ° C, condensation of sulfuric and sulfuric acid vapors occurs. The design of the heat exchanger ensures the condensation of acids and the removal of condensate through a condensate collector of acids into an industrial sewer. The bulk of the condensate - the condensate of water vapor is released during further cooling of the flue gas to a temperature of 60-70 ° C and is sent to the consumers of hot water through the steam trap without additional processing. To increase the temperature of the cooled flue gases and eliminate the possibility of condensation of water vapor residues in the tail sections of the system, hot flue gases are added to the gases through a bypass duct,
This design has obvious disadvantages. The added flue gases pass through the bypass duct bypassing the heat exchanger, and therefore, they take away part of the energy of vaporization of the fuel moisture, which reduces the heat recovery effect. In addition, the added hot flue gas contains residues of sulfuric and sulfuric acid fumes. The average temperature of the gas mixture is above the dew point of water vapor, but below the dew point of acids, which will inevitably cause condensation of their residues.
The objective of the invention is the cleaning of sulfuric and sulfuric acids of the entire volume of flue gases, eliminating the possibility of condensation of sulfuric and sulfuric acids in the tail elements of the flue gas removal system.
The technical result of the invention is to increase the economic performance of the CHP and increase the efficiency by increasing the efficiency of the utilized "hidden" heat of vaporization of the moisture of the fuel.
The task and, as a consequence, the specified technical result are achieved by the fact that the heat and condensate heat exchanger of the fossil fuel power plant contains a heat exchanger in the form of a tank filled with running water, inside which parallel rows of horizontally arranged pipes are located to move flue gases along them in one direction, connected with shirts located on the ends of the tank, each of which is divided into sections by horizontal shelves, while the upper part of the section of one shirt is connected t rub with the bottom of the shirt section located on the opposite side of the tank. The utilizer also has flues, a smoke exhaust, a condensate collector and pipelines. According to the invention, for regulating the temperature of the tail flue gases, the utilizer is equipped with an additional second heat exchanger identical to the first one, the reservoirs of which are connected to each other through the feeder, while the outlet of the cooled, dried flue gases of the first heat exchanger from the upper section of the jacket is connected through the outlet pipe to the lower section of the second jacket heat exchanger, and the upper section of the shirt of the second heat exchanger flue connected to the chimney.
In the proposed utilizer of heat and condensate of flue gases, all flue gases enter the first heat exchanger through the inlet pipe, where they move through the pipes of the coil located in the coolant volume. The temperature of the gases decreases, condensation of the moisture vapor of the fuel occurs. Due to the condensation energy, the temperature of the cooling water rises. The flue gas is cooled to a temperature that ensures the efficiency of heat exchange between the flue gas and the cooling water and sufficient utilization of the heat of vaporization of the fuel moisture.
The second additional heat exchanger is installed behind the first one for heating and, accordingly, eliminating the possibility of condensation of sulfuric and sulfurous acids in the tail section of the flue gas removal system and increasing the degree of utilization of the heat of vaporization of the fuel moisture. The second heat exchanger uses part of the utilized heat of vaporization of the moisture of the fuel.
The second heat exchanger is located in close proximity to the first. The cooled dried flue gases coming from the first heat exchanger into the lower single section of the second heat exchanger, moving along the coil, are heated to a temperature that excludes the possibility of condensation of the remaining moisture vapor in the chimney, and are sent to the chimney through the upper single section of the heat exchanger. The flue gas temperature is recorded at the outlet of the heat exchanger. The temperature is controlled by the flow rate of the coolant using the feeder of the first heat exchanger.
To heat the flue gases in the second heat exchanger, water heated in the first heat exchanger enters its upper part of the tank. The flue gas is heated to a temperature that eliminates the condensation of the residual moisture vapor of the fuel in the tail sections of the system. The tail gases are heated due to the part of the utilized heat in the first heat exchanger, and the efficiency increases.
The heat and condensate utilizer of the flue gas of the CHP plant is illustrated in the drawing.
The utilizer comprises a first heat exchanger 1 including a reservoir 2 filled with running water. Inside the tank 2 there are parallel rows of horizontal pipes 3 for moving flue gases along them in one direction. The horizontal pipes 3 are connected to the shirts 4 and 5 located on the end sides of the tank 2. Each shirt 4 and 5 is divided into sections 6 by horizontal shelves 7. The upper part of the section 6 of the shirt 4 is connected by pipes 3 to the lower part of the section 6 of the shirt 5, located on the opposite side side of the tank 2. The second heat exchanger 8 is identical to the first heat exchanger 1. The tank 2 of the first heat exchanger is connected through the feeder 9 to the tank 10 of the second heat exchanger 8. The exit of the cooled flue gases of the first heat exchanger 1 through the outlet pipe 11 of the upper section 6 of the jacket 4 of the duct 12 is connected to the lower section 13 of the jacket 14 of the second heat exchanger 8. The upper section 15 of the jacket 14 of the second heat exchanger 8 by the duct 16 is connected to a chimney (not shown). Condensed moisture is drained from the heat exchanger 1 into a condensate collector (not shown). Temperature control is carried out in the first heat exchanger 1 using a feeder 9. From the second heat exchanger 8, water is removed by the pump 17.
The heat and condensate of flue gases works as follows.
Flue gases enter the heat exchanger 1 with a temperature of 150-160 ° C. Condensation of sulfuric and sulfuric acids occurs at a temperature of 130-140 ° C. When moving through the pipes 3 of the heat exchanger, the temperature of the flue gas decreases and acid condensation occurs. The removal of condensate from the flue gas stream is caused by a decrease in the gas velocity in large volumes of the jacket sections 4 and 5 compared with the volumes of the pipes 3, an increase in the density of the condensate compared to the density in the gaseous state, and a multiple change in the direction of gas movement.
The entire volume of flue gases enters the heat exchanger 1 and, therefore, all flue gases are purified from sulfuric and sulfuric acids. And also the heat of vaporization of the moisture of the fuel to the temperature is utilized, which ensures the feasibility of using a heat exchanger 8. Part of the utilized heat is spent on raising the temperature of the flue gases, which excludes condensation of the remaining moisture vapor in the tail sections of the gas removal system.
All the utilized heat of vaporization of the moisture of the fuel is used to heat cooling water in the heat exchanger 1, which, due to the lack of contact with flue gases, can be used in the steam turbine cycle, condensate purified from sulfuric and sulfuric acids as hot water.
The cooled dried flue gases from the heat exchanger 1 enter the lower single section 13 of the heat exchanger 8. Moving along the coil of the heat exchanger 8, the flue gases are heated to a temperature that precludes the possibility of condensation of the remaining moisture vapor in the chimney, and are sent to the chimney through the upper single section 15 of the heat exchanger 8 . At the outlet of the heat exchanger 8, the temperature of the flue gases is recorded. Temperature control is carried out by the flow of coolant using feeder 9.
To heat the flue gases in the heat exchanger 8, the cooling water heated in the heat exchanger 1 enters the upper part of the tank 10. The flue gas is heated to a temperature that eliminates the condensation of residual steam of moisture in the fuel at the outlet of the flue gas removal system. Heating is carried out due to the part of the heat utilized in the heat exchanger 1.
Water is removed from the heat exchanger 8 by the pump 17. The cooling water in the process of cooling the flue gases does not come into contact with them anywhere, therefore, it can be used without additional processing in the steam turbine cycle.
Based on heat engineering calculations obtained
Figure 00000001
At present, the heat and condensate utilizer of the flue gas of the thermal power station is at the stage of the technical proposal.

Claims (1)

  1. A heat and condensate flue gas heat exchanger of a thermal power station containing a heat exchanger in the form of a tank filled with running water, inside which there are parallel rows of horizontally arranged pipes to move flue gases along them in one direction, connected to shirts located on the ends of the tank, each of which is divided on the section by horizontal shelves, while the upper part of the section of one shirt is connected by pipes to the lower part of the section of the shirt located on the opposite side of the tank RA, as well as gas ducts, smoke exhaust, condensate collector and pipelines, characterized in that the heat exchanger is equipped with an additional second heat exchanger identical to the first one, the reservoirs of which are connected to each other through a feeder, and the outlet of the cooled flue gases of the first heat exchanger from the upper section jacket through the outlet pipe flue connected to the lower section of the shirt of the second heat exchanger, and the upper section of the shirt of the second heat exchanger flue connected to the chimney.
RU2015141086A 2015-09-25 2015-09-25 Tpp flue gases heat and condensate utilizer RU2610355C1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU179851U1 (en) * 2017-05-24 2018-05-28 Федеральное государственное бюджетное образовательное учреждение высшего образования "Тверской государственный технический университет" Sub-arctic flue gas heat recovery unit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4753784A (en) * 1986-03-03 1988-06-28 Neverman Duane C Process to remove SOX and NOX from exhaust gases
SU1667639A3 (en) * 1984-10-02 1991-07-30 Вакер-Хеми Гмбх (Фирма) Method of recovering flue gas heat
RU65618U1 (en) * 2007-05-16 2007-08-10 Степан Иванович ВАСИЛЕВСКИЙ Waste heater of gas-fuel combustion products
RU150285U1 (en) * 2014-09-05 2015-02-10 Александр Викторович Рагуткин Condensation heat recovery (options)
RU2555919C1 (en) * 2014-04-08 2015-07-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тверской государственный технический университет" Surface-mounted heat recovery unit for deep heat recovery of flue gases, and its operation method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1667639A3 (en) * 1984-10-02 1991-07-30 Вакер-Хеми Гмбх (Фирма) Method of recovering flue gas heat
US4753784A (en) * 1986-03-03 1988-06-28 Neverman Duane C Process to remove SOX and NOX from exhaust gases
RU65618U1 (en) * 2007-05-16 2007-08-10 Степан Иванович ВАСИЛЕВСКИЙ Waste heater of gas-fuel combustion products
RU2555919C1 (en) * 2014-04-08 2015-07-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тверской государственный технический университет" Surface-mounted heat recovery unit for deep heat recovery of flue gases, and its operation method
RU150285U1 (en) * 2014-09-05 2015-02-10 Александр Викторович Рагуткин Condensation heat recovery (options)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU179851U1 (en) * 2017-05-24 2018-05-28 Федеральное государственное бюджетное образовательное учреждение высшего образования "Тверской государственный технический университет" Sub-arctic flue gas heat recovery unit

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