RU2659644C1 - Condensation heat exchanger - Google Patents

Condensation heat exchanger Download PDF

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Publication number
RU2659644C1
RU2659644C1 RU2017131443A RU2017131443A RU2659644C1 RU 2659644 C1 RU2659644 C1 RU 2659644C1 RU 2017131443 A RU2017131443 A RU 2017131443A RU 2017131443 A RU2017131443 A RU 2017131443A RU 2659644 C1 RU2659644 C1 RU 2659644C1
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RU
Russia
Prior art keywords
heat exchanger
water
contact
contact heat
flue gases
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Application number
RU2017131443A
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Russian (ru)
Inventor
Игорь Львович Ионкин
Виктор Сергеевич Бороздин
Лунинг Бьёрн
Павел Макарович Сверчков
Петр Кириллович Смирнов
Original Assignee
Игорь Львович Ионкин
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Priority to RU2017131443A priority Critical patent/RU2659644C1/en
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Publication of RU2659644C1 publication Critical patent/RU2659644C1/en

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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
    • 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
    • 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: proposed technical solution refers to the field of energy conservation and can be used in heat power engineering, metallurgy, chemical and other industries, where steam and hot water boilers burning organic fuels are used, as a result of which flue gases containing a significant volume of water vapor are formed. One of the highly effective energy-saving technologies is the utilization of low-potential heat of outgoing flue gases by condensing part of the water vapor contained therein. In the condensation heat exchanger, which includes the first contact heat exchanger 1, connected in series, comprising a drip trap 2, a dispenser 3, a divider 4, a second contact heat exchanger 18 containing a drip trap 23, a dispenser 24, a divider 25, a first recuperative heat exchanger 20, pumps, a water-to-water heat exchanger 10, flues 11–16, a chimney 17, the tank-neutralizer 19, according to the invention, the first contact heat exchanger 1 is additionally provided with a second and third series-connected heat recovery exchangers 33, 34, connected respectively to the first input of the first contact heat exchanger 1 and to the first output thereof, and it is provided with a multi-injector injector 5 connected between the output of the second recuperative heat exchanger 33 and the first input of the first contact heat exchanger 1.
EFFECT: technical problem solved by the proposed technical proposal is to utilize the low-potential heat of the outgoing flue gases and to avoid the condensation of water vapor in flues and chimneys by using a multi-injector injector, combining the functions of the pre-cooler and the exhaust fan, and heating the flue gases at the outlet of the condensing heat exchanger.
1 cl, 2 dwg

Description

The proposed technical solution relates to the field of energy conservation and can be used in the power industry, metallurgy, chemical and other industries where steam and hot water boilers burning organic fuel are used, plants that produce flue gases containing a significant amount of water vapor. One of the highly efficient energy-saving technologies is the utilization of low-grade heat of the exhaust flue gases by condensation of part of the water vapor contained in them.
A known device "Heat exchanger" (RF patent No. 2323384, publ. 04/27/2008) containing a contact heat exchanger, drip trap, gas-gas heat exchanger, flues, pipelines and a pump, there is a bypass channel along the return water of the contact heat exchanger, water-water heat exchanger and water-air heat exchanger with a bypass along the air. This device has the following disadvantages: the presence of a gas-gas heat exchanger, in which the dried combustion products are heated, causes additional losses with flue gases. The blast air in the known device is not humidified, which does not reduce nitrogen oxide emissions. In addition, the life of the chimney, subject to changes in temperature of the flue gases, may be short-lived. All these circumstances reduce the efficiency and economy of the heat exchanger.
A device is known "Condensing heat exchanger (options)" (RF patent No. 150285, publ. 02/10/2015), containing a first contact heat exchanger, a droplet eliminator, a dispenser, a divider, a preliminary heat exchanger-cooler, pumps, a water-water heat exchanger, flues, chimney , a second contact heat exchanger, a neutralizing tank, the first contact heat exchanger is equipped with a preliminary contact heat exchanger-cooler, an anti-icing device. This device has the following disadvantages: the chimney and flues must be made of waterproof materials and an anti-icing device is installed at the outlet of the chimney, and it is necessary to use a high-power smoke exhauster to overcome aerodynamic drag.
The technical problem solved by the proposed technical proposal is to utilize the low potential heat of the exhaust flue gases and to prevent condensation of water vapor in the flues and chimney by using a multi-nozzle injector that combines the functions of a pre-cooler and smoke exhauster, and heating the flue gases at the outlet of the condensing heat exchanger.
The technical effect that arises when solving this technical problem, which consists in the absence of the need to protect the chimney and gas duct from condensation, is achieved by the fact that in the known condensation heat exchanger including a first contact heat exchanger connected in series, comprising a droplet eliminator, a dispenser, a divider, and a second contact heat exchanger containing droplet eliminator, dispenser, divider, first recuperative heat exchanger, pumps, water-water heaters According to the invention, the first contact heat exchanger is additionally equipped with a second and third recuperative heat exchangers connected in series to each other, respectively, to the first inlet of the first contact heat exchanger and to its first outlet, and it is equipped with a multi-injector connected between the output of the second recuperative heat exchanger and the first input of the first contact heat exchanger.
In addition, the first contact heat exchanger can be made two-stage and is equipped with an additional distributing device and an additional divider.
In FIG. 1 shows a structural diagram of the proposed device, in FIG. 2 shows a structural diagram of the proposed device in the case of the first contact heat exchanger with two stages.
The device comprises (Fig. 1) a first contact heat exchanger (condenser) 1 connected in series, containing a droplet eliminator 2, a dispenser 3, a divider 4, a multi-nozzle injector 5, pumps 6, 7, 8, 9, a water-water heat exchanger 10, flues 11, 12, 13, 14, 15, 16, a chimney 17, a second contact heat exchanger (humidifier) 18, a catalytic converter 19. The second contact heat exchanger 18 is equipped with a first recuperative heat exchanger 20 located at its first output, and connected to the first contact by a second output heat exchanger 1, and ne its outlet is connected to the first outlet of the water-to-water heat exchanger 10. There are pipelines 21, 22 respectively at the second entrance and the second output of the water-water heat exchanger 10. The second contact heat exchanger 18 contains a droplet eliminator 23, a dispenser 24, a divider 25. The first exit is a water the water heat exchanger 10 by a pipe 26 is connected to the dispenser 3 of the first contact heat exchanger, the pipe 27 is connected to the dispenser 24 of the second contact heat exchanger 18. The second output of the second contact heat exchanger Ennik 18 is connected by a pipe 28 to the second input of the first contact heat exchanger 1. On the gas duct 15, after the recuperative heat exchanger 20, gates 29, 30 are installed. The tank-converter 19 is provided with pipelines 31, 32. The second recuperative heat exchanger 33 is connected to the flues 11 by the first input and the first output 38 respectively. The third recuperative heat exchanger 34 is connected with the first input to the first contact heat exchanger 1 and the first outlet to the gas duct 12. The second output of the recuperative heat exchanger 33 is connected to the second input of the recuperative heat exchanger 34 by a pipe 36. The second output of the recuperative heat exchanger 34 is connected to the second input of the recuperative heat exchanger 34 by a pipe 37.
Condensation heat exchanger operates as follows. The leaving combustion products after the boiler through the gas duct 11 (see Fig. 1) are fed to a recuperative heat exchanger 33, where their temperature decreases, and the multi-nozzle injector 5 is fed to the first contact heat exchanger (condenser) 1 through the gas duct 38. In the multi-nozzle injector 5, there is a decrease their temperature to an acceptable value (according to the operating conditions of the contact heat exchanger 1). Cooling occurs due to the contact of the combustion products and the condensate obtained in the condenser 1 supplied by the circulation pump 7. If the multi-nozzle injector 5 does not provide the required consumption of combustion products, an additional smoke exhauster can be used 6. The cooled combustion products enter the first contact heat exchanger (condenser) , 1 where they pass through a plastic divider 4, which is washed with circulating water supplied from above through a distributing device 3. The divider 4 serves to divide it into small drops, increasing the contact surface of water and combustion products. The combustion products are cooled below the dew point, giving off the heat obtained by cooling the combustion products and condensation of part of the water vapor contained in them. In the circulating water, part of the carbon dioxide and nitrogen oxides contained in the combustion products dissolve. Then, the cooled and partially dried combustion products pass through a droplet eliminator 2, where drops are separated by the entrained water gas stream. The combustion products are fed into a recuperative heat exchanger 34, connected to a recuperative heat exchanger 33 by pipelines 36, 37, where they are heated by circulation of the non-freezing coolant provided by the pump 35, and then through the duct 12 are fed into the chimney 17 and released into the atmosphere. The heating of the combustion products avoids the condensation of part of the remaining water vapor in the gas duct 12 and the chimney 17. The circulating pump 8 heated in the first contact heat exchanger (condenser) 1 is fed to the water-water heat exchanger 10, where the cold water supplied by pipeline 21. Heated water through pipeline 22 enters the heat supply system or other consumers (bringing to the required temperature is carried out by known methods - not shown in the diagram). The cooled circulating water through the pipe 27 enters the second contact heat exchanger (humidifier) 18 through the distributing device 24, where the air is heated and humidified in the divider 25 (similar to the divider 4), supplied through the gas duct 13. Then cooled (by heating the air and partial evaporation ) circulating water through a pipe 28 is supplied to the dispensing device 3 of the first contact heat exchanger (condenser) 1. Heated and humidified air passes drip eliminator 23, where it is freed from entrained drops of water, through the gas duct 14 enters recuperative heat exchanger 20 where it is heated by a few degrees to exclude the possibility of subsequent condensation. After the heat exchanger with a pump (blower fan) 9, air is supplied to the boiler. Additional air humidification allows to reduce the formation of nitrogen oxides, as well as the temperature of the recycled water entering the first contact heat exchanger (condenser) 1 through the distributing device 3. During summer operation, the temperature of the return network water can be low and additional cooling of the recycled water in the second contact heat exchanger (humidifier) 18 is not required. In this case, it is possible to operate the heat exchanger without a second contact heat exchanger (humidifier) 18. Return water after the heat exchanger 10 along line 26 (shown by a dotted line) is immediately supplied to the distributing device 3 of the first contact heat exchanger (condenser) 1, and the supply line to the humidifier 24 is closed (valves not shown in the diagram), air is supplied directly from the atmosphere through the gas duct 15 by closing the gate 30 and opening the gate 29. Excess condensate formed during the operation of the heat exchanger is discharged into the neutralization tank torus 19, where its acidity is brought to the required level due to the introduction of chemicals in the pipeline 32. The neutralized water is removed through the pipeline 31 and then can be used as make-up water or disposed of.
In addition, the first contact heat exchanger can be made two-stage (Fig. 2). The second stage is formed by an additional dispensing device 39 and an additional divider 40. The second output of the second contact heat exchanger 18 is connected to the additional dispensing device 39 of the first contact heat exchanger 1. The operation is performed in this way. Water from the second contact heat exchanger 18 is supplied to an additional dispensing device 39 of the second stage of the first contact heat exchanger 1. Thus, only part of the recycled water passes through the additional divider 40, which, after passing through the humidifier 18, has a reduced temperature. This allows you to further reduce the temperature of the flue gases behind the heat exchanger. The rest of the recycled water is supplied through a dispenser 3 of the first stage of the first contact heat exchanger 1.

Claims (2)

1. Condensation heat exchanger, which includes a series-connected first contact heat exchanger containing a droplet eliminator, a dispenser, a divider, a second contact heat exchanger containing a droplet eliminator, a distributor, a divider, a first recuperative heat exchanger, pumps, a water-water heat exchanger, flues, a chimney, neutralizing tank, characterized in that the first contact heat exchanger is additionally equipped with a second and third recuperator connected in series tive heat exchangers that are connected respectively to the first input of the first contact to the first heat exchanger and its output, and it is provided with an injector mnogoforsunochnym connected between the output of the second regenerative heat exchanger and the first input of the first contact heat exchanger.
2. The condensation heat exchanger according to claim 1, characterized in that the first contact heat exchanger is made in two stages and is equipped with an additional distributing device and an additional divider.
RU2017131443A 2017-09-07 2017-09-07 Condensation heat exchanger RU2659644C1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2735042C1 (en) * 2020-05-26 2020-10-27 Михаил Евгеньевич Пузырев Condensation heat recovery unit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4012191A (en) * 1975-06-18 1977-03-15 Foster Wheeler Energy Corporation System for recovering heat from the exhaust gases of a heat generator
SU1430666A1 (en) * 1987-01-07 1988-10-15 Научно-Исследовательский Институт Санитарной Техники И Оборудования Зданий И Сооружений Heat recovery installation
SU1557417A1 (en) * 1988-02-12 1990-04-15 Научно-Исследовательский Институт Санитарной Техники И Оборудования Зданий И Сооружений Heat utilization plant
RU2323384C1 (en) * 2006-08-30 2008-04-27 Сергей Леонидович Торопов Heat waste recover
RU150285U1 (en) * 2014-09-05 2015-02-10 Александр Викторович Рагуткин Condensation heat recovery (options)

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4012191A (en) * 1975-06-18 1977-03-15 Foster Wheeler Energy Corporation System for recovering heat from the exhaust gases of a heat generator
SU1430666A1 (en) * 1987-01-07 1988-10-15 Научно-Исследовательский Институт Санитарной Техники И Оборудования Зданий И Сооружений Heat recovery installation
SU1557417A1 (en) * 1988-02-12 1990-04-15 Научно-Исследовательский Институт Санитарной Техники И Оборудования Зданий И Сооружений Heat utilization plant
RU2323384C1 (en) * 2006-08-30 2008-04-27 Сергей Леонидович Торопов Heat waste recover
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
RU2735042C1 (en) * 2020-05-26 2020-10-27 Михаил Евгеньевич Пузырев Condensation heat recovery unit

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