CN201827875U - Low-temperature flue gas waste heat recovery device - Google Patents
Low-temperature flue gas waste heat recovery device Download PDFInfo
- Publication number
- CN201827875U CN201827875U CN2010202163369U CN201020216336U CN201827875U CN 201827875 U CN201827875 U CN 201827875U CN 2010202163369 U CN2010202163369 U CN 2010202163369U CN 201020216336 U CN201020216336 U CN 201020216336U CN 201827875 U CN201827875 U CN 201827875U
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- water
- heat exchanger
- air
- flue gas
- gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
Abstract
The utility model discloses a low-temperature flue gas waste heat recovery device, which adopts the scheme that a gas-water heat exchanger (4) is serially or parallely connected to a flue duct at the rear part of an induced-draft fan or booster fan (3) of the traditional boiler or kiln (1), a hot-side inlet end of the gas-water heat exchanger is connected with the induced-draft fan or the booster fan (3), and a hot-side outlet end of the gas-water heat exchanger is communicated with a desulphurization absorption tower (8) or chimney (9); a cold-side inlet end of the gas-water heat exchanger is communicated with a water outlet pipeline or condensing water pipe of a hot user circulating return water or boiler softened water system, and a cold-side outlet end of the gas-water heat exchanger is communicated with a hot user circulating water supply or boiler feed pump; a waterway bypass pipeline is connected between the hot-side outlet pipeline and a cold-side inlet pipeline of the gas-water heat exchanger, and a waterway bypass regulating valve (5) is arranged on the waterway bypass pipeline; and a flue gas bypass pipeline is arranged between the induced-draft fan or booster fan and the desulphurization absorption tower (8), and a flue gas bypass regulating valve (6) is arranged on the flue gas bypass pipeline. The purpose of saving thermal energy is achieved by serially or parallely connecting the gas-water heat exchanger to the flue duct at the rear part of the induced-draft fan of the boiler or kiln.
Description
Technical field
The utility model belongs to the heat recovery technical field, and what relate generally to is a kind of low-temperature flue gas heat recovery device.
Background technology
In thermal power plant and industrial production, the exhaust smoke level of boiler is very huge.Present production technology be flue gas about 150 ℃ through the sulfur removal technology desulfurization after chimney enters atmosphere.Owing to have cryogenic condensation corrosion and consequent stickiness black dirt problem, existing heat exchanger all will avoid the exhaust gas temperature of heat exchanger exit low excessively when design, to guarantee the service life and the safety of heat exchanger.Therefore for about 150 ℃ low exhaust gas temperature, existing heat exchanger can not fundamentally solve cryogenic condensation corrosion and consequent stickiness black dirt problem, cause the flue gas that contains a large amount of heats from chimney, to be discharged into atmosphere and be not fully utilized, cause boiler thermal output to descend, gross coal consumption rate rises.
Flue gas flow with the thermal power plant is an example: the low-temperature flue gas that comes out from heated surface at the end of boiler is after deduster is handled, through air-introduced machine, the booster fan supercharging, enter the preceding hot side of gas-to-gas heat exchanger (GGH) of desulfuration absorbing tower, flue-gas temperature is reduced to below 100 ℃, (effect of this heat exchanger is the flue gas that utilizes after the preceding flue gas heat of desulfurization processing adds the thermally desulfurizing processing,) low-temperature flue gas after cooling enters desulfuration absorbing tower and carry out desulfurization and handle, about 50 ℃ of low-temperature flue gas after desulfurization is handled, be heated to 80 ℃ through the gas-to-gas heat exchanger cold side again, after chimney enters atmosphere.In this technological process, though the low-temperature flue gas of discharging from boiler tail has carried out energy exchange in gas-to-gas heat exchanger (GGH), but the energy of exchange does not obtain utilizing, and the energy part in the flue gas enters atmosphere through chimney, and a part is consumed in the desulfuration absorbing tower.The temperature of flue gas is very low herein, but exhaust gas volumn is huge, and entrained heat also is very big.This part heat all is disposed in the atmosphere at present, causes great waste.
Summary of the invention
At the UTILIZATION OF VESIDUAL HEAT IN of low-temperature flue gas, the purpose of this utility model is to provide a kind of low-temperature flue gas heat recovery device.By air-water heat exchanger of serial or parallel connection in boiler or stove air-introduced machine rear portion flue, utilize feedwater of heat heating boiler or cycling use of water through the low-temperature flue gas behind the air-introduced machine, reach the purpose of saving heat energy.
The utility model realizes that the technical scheme that above-mentioned purpose is taked is: air-water heat exchanger of serial or parallel connection in the flue at boiler or stove air-introduced machine or booster fan rear portion, the hot side-entrance end of this air-water heat exchanger is connected with air-introduced machine or booster fan, hot side outlet end is communicated with desulfuration absorbing tower or chimney, the cold side entrance point is communicated with the outlet conduit or the condensate pipe of hot user's circulating backwater or boiler water softening system, the cold side port of export is communicated with hot user's periodical feeding or boiler feed pump, between air-water heat exchanger cold side import and export pipeline, be connected with the water route by-pass line, and this pipeline is provided with the water route bypass regulator valve; Between air-introduced machine or booster fan and desulfuration absorbing tower or chimney, be provided with the flue gas by-pass line, and this flue gas by-pass line is provided with the flue bypass regulator valve.
The utility model is owing to air-water heat exchanger of serial or parallel connection in boiler or stove air-introduced machine rear portion flue, make boiler feedwater or cycling use of water fully absorb the heat in the low-temperature flue gas by this air-water heat exchanger, and heat returned in the boiler body participate in the heat circulation, or the heat in the low-temperature flue gas directly supplied with hot user, realized the saving of heat energy.
Description of drawings
Fig. 1 is used for the schematic flow sheet of heat cycles water for the utility model.
Fig. 2 is used for the schematic flow sheet of heating boiler feedwater for the utility model.
Among the figure: 1, boiler or stove, 2, deduster, 3, air-introduced machine or booster fan, 4, air-water heat exchanger, 5, the water route bypass regulator valve, 6, the flue bypass regulator valve, 7, circulating pump, 8, desulfuration absorbing tower, 9, chimney, 10, hot user, 11, low-pressure heater, 12, oxygen-eliminating device, 13, feed pump, 14, high-pressure heater.
The specific embodiment
In conjunction with the accompanying drawings, it is as follows to provide embodiment of the present utility model;
As shown in Figure 1: present embodiment is the device that is used for the heat cycles water, mainly is made of boiler or stove 1, deduster 2, air-introduced machine or booster fan 3, air-water heat exchanger 4, water route bypass regulator valve 5, flue bypass regulator valve 6, circulating pump 7, desulfuration absorbing tower 8, chimney 9, hot user 10.Each several part connects by pipeline and annex, valve etc.In the flue of air-water heat exchanger 4 (separate case is applied for a patent) serial or parallel connection between air-introduced machine or booster fan 3 and desulfuration absorbing tower 8, the hot side-entrance end of air-water heat exchanger 4 is connected with air-introduced machine or booster fan 3, hot side outlet end is connected with desulfuration absorbing tower 8 or chimney 9, the cold side entrance point is connected with hot user's 10 backwater ends through water circulating pump 7, the cold side port of export supplies water with hot user 10 and is connected, between air-water heat exchanger 4 cold sides import and export pipeline, be connected with the water route by-pass line, and this pipeline is provided with water route bypass regulator valve 5, between air-water heat exchanger 4 hot sides import and export pipelines, be connected with the gas circuit by-pass line, and this flue gas by-pass line is provided with flue bypass regulator valve 6.During use,, carry out supercharging through air-introduced machine or booster fan 3 again, enter the 4 hot side-entrances of air-water heat exchanger from low-temperature flue gas process deduster 2 dedustings of boiler or the generation of stove 1 back-end surfaces; Cycling use of water enters air-water heat exchanger 4 cold side entrance points after water circulating pump 7 pressurizations, carry out exchange heat with low-temperature flue gas, with the heat transferred cycling use of water of low-temperature flue gas.Cycling use of water is behind hot user's 10 coolings, entering air-water heat exchanger 4 cold side entrance points through the water circulating pump pressurization once more circulates, the part cycling use of water can be through water route bypass regulator valve 5, mix with the hot water of effluent gases-water-to-water heat exchanger 4 cold sides, participate in circulation directly, and needn't enter air-water heat exchanger 4 cold sides, can regulate the supply water temperature of cycling use of water with this; Low-temperature flue gas is behind cooling, and flue-gas temperature is reduced to below the dew-point temperature at air-water exchanger heat side outlet place, enters desulfuration absorbing tower again and carries out the desulfurization processing, or directly enter atmosphere through chimney; Partial fume can directly enter flue through flue bypass regulator valve 6, mixes with the low-temperature flue gas of the air-water heat exchanger 4 hot side outlets of flowing through, and can regulate the exhaust temperature of flue gas with this.
As shown in Figure 2: present embodiment is the device that the utility model is used for the heating boiler feedwater, specifically mainly is made of boiler or stove 1, deduster 2, air-introduced machine or booster fan 3, air-water heat exchanger 4, water route bypass regulator valve 5, flue bypass regulator valve 6, circulating pump 7, desulfuration absorbing tower 8, chimney 9, low-pressure heater 11, oxygen-eliminating device 12, feed pump 13 and high-pressure heater 14.Each several part connects by pipeline and annex, valve etc.Air-water heat exchanger 4 (separate case is applied for a patent) serial or parallel connection is in the flue of air-introduced machine or booster fan 3 and desulfuration absorbing tower 8 or chimney 9, and air-water heat exchanger 4 employing resistant materials or outer surface are sintering enamelled.The hot side-entrance end of air-water heat exchanger 4 is connected with air-introduced machine or booster fan 3, hot side outlet end is connected with desulfuration absorbing tower 8 or chimney 9, the cold side entrance point of air-water heat exchanger 4 is communicated with the outlet conduit or the condensate pipe of boiler water softening system, and the port of export enters boiler body through low-pressure heater 11, oxygen-eliminating device 12, feed pump 13, high-pressure heater 14 successively.Between air-water heat exchanger 4 hot sides import and export pipelines, be connected with the gas circuit by-pass line, and this flue gas by-pass line is provided with flue bypass regulator valve 6, between air-water heat exchanger 4 cold sides import and export pipeline, be connected with the water route by-pass line, and this pipeline is provided with water route bypass regulator valve 5.During use,, carry out supercharging through air-introduced machine or booster fan 3 again, enter air-water heat exchanger 4 hot sides from low-temperature flue gas process deduster 2 dedustings of boiler or the generation of stove 1 back-end surfaces; Demineralized water that boiler uses or condensed water enter the 4 cold side imports of air-water heat exchanger after feed pump 13 pressurizations, carry out exchange heat with low-temperature flue gas, with the heat transferred boiler feedwater of low-temperature flue gas; Behind boiler feedwater effluent gases-water-to-water heat exchanger 4 cold sides, enter boiler body through low-pressure heater 11, oxygen-eliminating device 12, feed pump 13, high-pressure heater 14 successively, or directly after feed pump 13 pressurizations, enter boiler body; The part boiler feedwater can mix with the hot water of effluent gases-water-to-water heat exchanger 4 cold sides outlet, and needn't enter air-water heat exchanger 4 cold sides through water route bypass regulator valve 5, can regulate the supply water temperature of boiler feedwater with this; Low-temperature flue gas is behind cooling, and flue-gas temperature is reduced to below the dew-point temperature at air-water heat exchanger exit place, enters desulfuration absorbing tower again and carries out the desulfurization processing, or directly enter atmosphere through chimney; Partial fume can directly enter flue through flue bypass regulator valve 6, mixes with the low-temperature flue gas of the air-water heat exchanger 4 hot sides of flowing through, and can regulate the exhaust temperature of flue gas with this.
Claims (4)
1. low-temperature flue gas heat recovery device, comprise boiler or stove (1), air-introduced machine or booster fan (3), it is characterized in that: an air-water heat exchanger of serial or parallel connection (4) in the flue at described boiler or stove (1) air-introduced machine or booster fan (3) rear portion, the hot side-entrance end of this air-water heat exchanger is connected with air-introduced machine or booster fan (3), hot side outlet end is communicated with desulfuration absorbing tower (8) or chimney (9), the cold side entrance point is communicated with the outlet conduit or the condensate pipe of hot user's circulating backwater or boiler water softening system, the cold side port of export is communicated with hot user's periodical feeding or boiler feed pump, between air-water exchanger heat side outlet pipeline and cold side inlet pipeline, be connected with the water route by-pass line, and this pipeline is provided with water route bypass regulator valve (5); Flue gas by-pass line between air-introduced machine or booster fan and desulfuration absorbing tower (8), and this flue gas by-pass line is provided with flue bypass regulator valve (6).
2. low-temperature flue gas heat recovery device according to claim 1 is characterized in that: the cold side entrance point of described air-water heat exchanger (4) is connected through the backwater end of water circulating pump (7) with hot user (10).
3. low-temperature flue gas heat recovery device according to claim 1 is characterized in that: the hot side outlet end of described air-water heat exchanger (4) with enter boiler body through low-pressure heater (11), oxygen-eliminating device (12), feed pump (13), high-pressure heater (14) successively.
4. low-temperature flue gas heat recovery device according to claim 1 is characterized in that: described air-water heat exchanger (4) employing resistant material or outer surface are sintering enamelled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202163369U CN201827875U (en) | 2010-06-07 | 2010-06-07 | Low-temperature flue gas waste heat recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202163369U CN201827875U (en) | 2010-06-07 | 2010-06-07 | Low-temperature flue gas waste heat recovery device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201827875U true CN201827875U (en) | 2011-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202163369U Expired - Fee Related CN201827875U (en) | 2010-06-07 | 2010-06-07 | Low-temperature flue gas waste heat recovery device |
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| CN (1) | CN201827875U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102506575A (en) * | 2011-09-21 | 2012-06-20 | 李柏荣 | Treatment process for lignite upgrading waste water and lignite upgrading system |
| CN104006399A (en) * | 2014-05-30 | 2014-08-27 | 天津大学 | Organic rankine cycle based boiler energy saving system |
| CN104390207A (en) * | 2014-11-24 | 2015-03-04 | 天津理工大学 | Heat recovering and utilizing system for low-temperature flue gas |
| US20210302096A1 (en) * | 2019-08-15 | 2021-09-30 | Tyler Player | Drying Apparatus and Method of Drying |
-
2010
- 2010-06-07 CN CN2010202163369U patent/CN201827875U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102506575A (en) * | 2011-09-21 | 2012-06-20 | 李柏荣 | Treatment process for lignite upgrading waste water and lignite upgrading system |
| CN102506575B (en) * | 2011-09-21 | 2014-06-18 | 千秋能源（上海）有限公司 | Treatment process for lignite upgrading waste water and lignite upgrading system |
| CN104006399A (en) * | 2014-05-30 | 2014-08-27 | 天津大学 | Organic rankine cycle based boiler energy saving system |
| CN104390207A (en) * | 2014-11-24 | 2015-03-04 | 天津理工大学 | Heat recovering and utilizing system for low-temperature flue gas |
| US20210302096A1 (en) * | 2019-08-15 | 2021-09-30 | Tyler Player | Drying Apparatus and Method of Drying |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110511 Termination date: 20140607 |