CN208365564U - A kind of boiler smoke energy conservation disappears white device - Google Patents

A kind of boiler smoke energy conservation disappears white device Download PDF

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Publication number
CN208365564U
CN208365564U CN201820472363.9U CN201820472363U CN208365564U CN 208365564 U CN208365564 U CN 208365564U CN 201820472363 U CN201820472363 U CN 201820472363U CN 208365564 U CN208365564 U CN 208365564U
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flue gas
boiler
heat exchanger
air
waste heat
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CN201820472363.9U
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郭启刚
李爱云
郭泰�
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Beijing Xing Sheng Technology Co Ltd
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Beijing Xing Sheng Technology Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/30Technologies for a more efficient combustion or heat usage

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  • Chimneys And Flues (AREA)
  • Treating Waste Gases (AREA)

Abstract

A kind of boiler smoke energy conservation disappears white device, it includes boiler and air preheater, deduster, air-introduced machine, desulfuration absorbing tower, chimney by flue and boiler sequential connection, the air preheater is connected with the air inlet and pressure fan of the boiler by air supply duct, the entrance of the pressure fan or outlet are equipped with air-supply heater, the air-supply heater is equipped with heating agent water inlet and heating agent water out, is successively connect with the smoke gas afterheat heat exchanger and heating agent water-cooling apparatus between the heating agent water inlet and the heating agent water out by heating agent waterpipe.A kind of boiler smoke energy conservation provided by the utility model disappears white device, not only can abundant Mist heat recovering, but also there is apparent heat pump effect, the grade and utilization efficiency for recycling thermal energy can be promoted.

Description

Boiler flue gas energy-saving and white-removing device
Technical Field
The utility model relates to an energy-concerving and environment-protective field, in particular to boiler flue gas is energy-conserving to disappear white device.
Background
In the existing boiler flue gas treatment system, flue gas generated by a boiler is usually discharged into a chimney and enters the atmosphere after passing through an air preheater, a dust remover, a draught fan and a desulfurization absorption tower in sequence; can retrieve partial flue gas waste heat in the air heater who gives the boiler air supply, nevertheless receive the low temperature corrosion scheduling problem of air heater, the flue gas that is discharged from the air heater export is still high in temperature, consequently, the flue gas temperature that gets into the desulfurizing tower is still high, the desulfurization thick liquid in the absorption tower will absorb a large amount of latent heats of vaporization, partial moisture will be evaporated and is discharged into the atmosphere along with the flue gas, in addition because the flue gas temperature that discharges into atmospheric is higher, just also cause a large amount of latent heats of vaporization that vapor carried and the sensible heat that the flue gas carried to be discharged into the atmosphere, cause energy loss, and carry a large amount of moisture, cause water loss and environmental pollution, form serious chimney and emit the white cigarette phenomenon.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a boiler energy-conservation white device of receiving that disappears makes it reach the purpose of retrieving the flue gas waste heat and subducing the white cigarette of chimney.
For solving the technical problem, the utility model provides an energy-conserving white device that disappears of boiler flue gas, its include the boiler and through the flue with air heater, dust remover, draught fan, desulfurization absorption tower, chimney that the boiler is connected in proper order, air heater is connected with respectively through the supply-air duct the air intake and the forced draught blower of boiler, the entry or the export of forced draught blower are equipped with air supply heater, air supply heater is equipped with hot media water entry and hot media water export, hot media water entry with flue gas waste heat exchanger and hot media water cooling device have connected gradually through hot media water pipeline between the hot media water export, be equipped with hot media water power drive on the hot media water pipeline.
Preferably, the desulfurization absorption tower is provided with a slurry circulating pipe, and the flue gas waste heat exchanger is arranged on the slurry circulating pipe;
preferably, the flue gas waste heat exchanger is arranged on a flue at an inlet or an outlet of the desulfurization absorption tower;
preferably, the flue gas waste heat exchanger is a hybrid heat exchanger.
Preferably, the flue gas waste heat exchanger is arranged in the desulfurizing tower.
Preferably, the flue gas waste heat exchanger is a water spraying tower, and the water spraying tower is arranged on the upper part of the desulfurization absorption tower or on a flue at the outlet of the desulfurization absorption tower or in the chimney.
Preferably, the heat medium water cooling device is a mechanical draft tower, a water spray tower, an air cooling tower, a heat pump or an external cold source;
preferably, the hot water cooling device is connected with a hot water bypass and a control valve in parallel.
Preferably, the air supply heater is connected with a first hot water bypass and a control valve in parallel;
preferably, a first flue gas waste heat exchanger is arranged on a flue between the air preheater and the dust remover.
Preferably, the air preheater is provided with a second flue gas waste heat exchanger in parallel.
Preferably, a third flue gas waste heat exchanger is arranged at an inlet or an outlet of the induced draft fan.
It should be noted that the blower described herein refers to various blowers that directly or indirectly blow air to the furnace of the boiler, including blowers and primary blowers in the power industry.
The utility model provides an energy-conserving white device that disappears of boiler flue gas not only can fully retrieve the flue gas waste heat, has obvious heat pump action moreover, can promote the grade and the utilization efficiency of retrieving the heat energy, can also pass through the reduction of flue gas temperature simultaneously, improves electrostatic precipitator's dust collection efficiency, desulfurizing tower desulfurization efficiency, and the reduction moisture of discharging fume and pollutant are carried, reduces the chimney and emits the white cigarette phenomenon, reduces the water consumption, retrieves partial water, plays energy-conservation, environmental protection's effect simultaneously.
Drawings
The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein,
fig. 1 is a schematic structural diagram of a boiler flue gas energy-saving and white-eliminating device according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an improved embodiment based on FIG. 1;
FIG. 3 is a schematic structural diagram of another modified embodiment based on FIG. 1;
FIG. 4 is a schematic structural diagram of a modified embodiment based on FIG. 3;
FIG. 5 is a schematic structural diagram of another modified embodiment based on FIG. 3;
fig. 6 is a schematic structural diagram of a modified embodiment based on fig. 5.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals.
Fig. 1 is a schematic structural diagram of a boiler flue gas energy-saving and whitening device according to an embodiment of the present invention. Referring to fig. 1, the utility model provides an energy-conserving white device that disappears of boiler flue gas, it include boiler 1 and through the flue with 1 air heater 2, dust remover 3, draught fan 4, desulfurization absorption tower 5, chimney 7 that connect gradually of boiler, air heater 2 is connected with respectively through the supply-air duct air intake 101 and forced draught blower 6 of boiler 1, the entry or the export of forced draught blower 6 are equipped with air supply heater 8, air supply heater 8 is equipped with hot media water entry 81 and hot media water export 82, hot media water entry 81 with connect gradually flue gas waste heat exchanger 9 and hot media water cooling device 10 through hot media water pipeline between the hot media water export 82, be equipped with hot media water power drive unit 11 on the hot media water pipeline.
The hot water power driving unit 11 may be a circulation pump, and hot water circulates by the hot water power driving unit 11. The flue gas entering the desulfurization absorption tower 5 is subjected to mixing heat exchange by desulfurization slurry sprayed by a spraying system of the desulfurization absorption tower 5, and the desulfurization slurry absorbs the waste heat in the flue gas and then falls into a slurry tank at the bottom of the desulfurization absorption tower; desulfurization absorption tower 5 is equipped with thick liquid circulating pipe 51, flue gas waste heat exchanger 9 can set up on the thick liquid circulating pipe 51, the desulfurization thick liquid is in the thick liquid circulating pipe 51 in cycle use and pass through the absorptive heat flue gas waste heat exchanger 9 transmits for hot water, and transmits for via hot water air supply heater 8, air supply heater 8 gives air heater 2's air with heat transfer, also be the make-up air of boiler 1 to realized the follow the waste heat utilization of draught fan 4 export flue gas. After passing through the air preheater 2, the low-grade flue gas waste heat is improved into high-grade heat energy, so that the recycling efficiency of the flue gas waste heat can be improved, and the heat pump effect is realized. The heat medium water after heat exchange and temperature reduction by the air supply heater 8 flows through the heat medium water cooling device 10 for further cooling and temperature reduction and then returns to the flue gas waste heat exchanger 9. The desulfurization slurry after heat release and cooling of the heat medium water can be sprayed into the desulfurization absorption tower 5 from a spraying device, so that the temperature and the humidity of the flue gas at the outlet of the desulfurization system 5 are reduced, and the effects of strengthening desulfurization and dust removal, reducing the moisture content of the flue gas at the outlet of the desulfurization tower and the white smoke of a chimney, reducing desulfurization water supplement and wastewater discharge and the like can be achieved. The heating medium water cooling device 10 is arranged to improve the heat exchange temperature difference of the flue gas waste heat exchanger 9, strengthen the cooling effect on the desulfurization slurry and even the flue gas, further reduce the temperature and the humidity of the flue gas, and improve the white elimination effect of the chimney, which is particularly important when the cooling capacity of the air supply heater 8 is poor in the season with higher ambient temperature. The number of the desulfurization slurry circulating pipes 51 can be one or more, and the flue gas waste heat exchanger 9 can be arranged on one slurry circulating pipe 51, or on a plurality of slurry circulating pipes 51.
Of course, the flue gas waste heat exchanger 9 can also be arranged inside the desulfurization absorption tower 5, for example, in a slurry pool, the flue gas waste heat exchanger 9 absorbs the heat of the desulfurization slurry in the slurry pool in the desulfurization absorption tower 5, so that the temperature of the slurry is reduced, and the flue gas temperature and the humidity at the outlet of the desulfurization absorption tower 5 are reduced by mixing and heat exchange with the flue gas through slurry spraying.
The heat medium water cooling device 10 may be a mechanical ventilation tower, a water spray tower, an air cooling tower, a heat pump, or an external cold source, such as a river, a sea, a lake, a reservoir, etc., as long as it can cool the heat medium water.
Fig. 2 is a schematic structural diagram of an improved embodiment based on fig. 1. Referring to fig. 2, in a preferred embodiment, the hot water cooling unit 10 is coupled in parallel with a hot water bypass and control valve bank 12. The control valve group 12 may include a plurality of valves, for example, as shown in fig. 2, and may be provided on the hot water bypass and the two side pipes of the hot water cooler 10, respectively. The function is as follows: when the ambient temperature is low, the cooling capacity of the blower heater 8 is high, and the flow rate of the heating medium water passing through the heating medium water cooling device 10 can be reduced or shut off by the heating medium water bypass and the control valve group 12.
Fig. 3 is a schematic structural diagram of another modified embodiment based on fig. 1. Referring to fig. 3, in a preferred embodiment, the flue gas waste heat exchanger 9 is disposed in a flue at an outlet of the desulfurization tower 5, and the flue gas waste heat exchanger 9 directly absorbs the flue gas waste heat and reduces the temperature and humidity of the flue gas. Of course, the flue gas waste heat exchanger may also be disposed in the flue at the inlet of the desulfurization absorption tower 5. The flue gas waste heat exchanger 9 can be a dividing wall type heat exchanger, namely flue gas and heat medium water are not directly contacted, but are conducted through the wall surface of the heat exchanger; the flue gas waste heat exchanger 9 can also be a mixed heat exchanger, namely, flue gas and heat medium water are directly mixed for heat exchange, and the heat of the flue gas is directly absorbed by the heat medium water.
Fig. 4 is a schematic structural diagram of an improved embodiment based on fig. 3. Referring to fig. 4, in a preferred embodiment, the supply air heater 8 is connected in parallel with a first hot water bypass and a first control valve group 13. The first control valve group 13 may include a plurality of valves, and for example, as shown in fig. 4, may be provided on the first hot water bypass and the both side pipes of the supply air heater 8, respectively. The function is as follows: when the ambient temperature is high, the cooling capacity of the air supply heater 8 is weak, and the flow rate of the hot water passing through the air supply heater 8 can be adjusted or closed by the first hot water bypass and the first control valve group 13, so that the energy consumption of the hot water driving device 11 is reduced.
Of course, the configuration in which the blower heater 8 in the embodiment shown in fig. 4 is connected in parallel with the first hot water bypass and the first control valve group 13 may also be adopted in the system configuration of the blower heater 8 in the embodiment shown in fig. 1 and other drawings. The embodiment of fig. 2 in which the hot water cooler 10 is connected in parallel with the hot water bypass and control valve block 12 can also be used in the system configuration of the hot water cooler 10 in the embodiment of fig. 3 or in the other embodiments of the drawings.
Fig. 5 is a schematic structural diagram of another modified embodiment based on fig. 3. Referring to fig. 5, in a preferred embodiment, the flue gas waste heat exchanger 9 is a water spraying tower, and the water spraying tower 9 is disposed on an outlet flue of the desulfurization absorption tower 5. The low-temperature heat medium water from the heat medium water outlet 82 of the air supply heater 8 or the heat medium water cooling device 10 is sprayed into the water spraying tower 9 to perform mixing heat exchange with the flue gas entering the water spraying tower 9, so that the temperature of the flue gas is reduced, and the humidity is reduced; meanwhile, the heat medium water is heated, the temperature is increased, the moisture in the other part of the flue gas is condensed and separated out and falls into the bottom of the water spraying tower 9 together with the heat medium water, and the recovered water enters a heat medium water pipeline and is sent to the air supply heater 8 to heat the air supply. It should be noted that, under this kind of scheme, along with time, the flue gas comdenstion water will increase gradually, and this part of water can be used for other users, and this is not repeated here.
Fig. 6 is a schematic structural diagram of a modified embodiment based on fig. 5. Referring to fig. 6, in a preferred embodiment, the flue gas waste heat exchanger 9' is a water spray tower arranged at the upper part of the desulfurization absorption tower 5. That is, the upper body of the desulfurization absorption tower 5 may be extended partially to serve as the body of the water spray tower, which may make the overall structure more compact. In this case, the structure of the liquid collecting device 901 below the flue gas waste heat exchanger 9' may adopt the structure of the liquid collecting device adopted by the inventor in the flue gas desulfurization wastewater evaporative concentration treatment device in chinese patent ZL 2017205747458. And will not be described in detail herein.
In a preferred embodiment, the flue gas waste heat exchanger 9' may also be disposed in the chimney 7, that is, a part of the chimney 7 is used as a tower body of a water spraying tower.
In a preferred embodiment, a first flue gas waste heat exchanger 31 is arranged between the air preheater 2 and the dust remover 3. This allows recovering the residual heat of the outlet flue gas of the air preheater 2. The boiler air supply heater 8 sends low-grade heat extracted from the smoke at the outlet of the induced draft fan 4 to the hearth of the boiler 1 through a part of the air preheater 2, so that the direct fuel saving effect can be achieved, and the utilization efficiency is high; the other part of the high-grade heat is converted into high-grade heat through the increase of the temperature of the outlet flue gas of the air preheater 2, and the first flue gas waste heat exchanger 31 can transfer the high-grade heat to other heat users, such as condensed water of a heating or heating steam turbine. Therefore, conversion from low-grade heat to high-grade heat of the flue gas waste heat and gradient recycling of the flue gas waste heat are realized, the utilization efficiency of the flue gas waste heat can be improved, and the heat pump efficiency is high. Meanwhile, the inlet flue gas temperature of the dust remover 3 is reduced by the first flue gas waste heat exchanger 31, so that the specific resistance and the volume flow of the flue gas are reduced, the efficiency of the dust remover 3 can be improved, and the removal of partial vulcanization components can be facilitated.
Of course, the inlet or the outlet of the induced draft fan 4 may be provided with a third flue gas waste heat exchanger (not shown in the figure), which has the advantage that the wear of the flue gas to the heat exchanger after dust removal is greatly reduced.
In a preferred embodiment, the air preheater 2 is provided with a second flue gas waste heat exchanger 21 in parallel. That is to say, the flue gas inlet and the flue gas outlet of the second flue gas waste heat exchanger 21 are respectively connected with the flue gas inlet flue and the flue gas outlet flue of the air preheater 2, that is, the bypass flue of the air preheater 2 is provided, and the second flue gas waste heat exchanger is arranged in the bypass flue. Because the air temperature at the inlet of the air preheater 2 can be increased by the boiler air supply heater 8, the demand of high-temperature flue gas at the inlet of the air preheater 2 is reduced, the bypass flue and the second flue gas waste heat exchanger 21 can fully utilize high-grade heat, for example, the high-grade heat can be transmitted to other heat users, so that the conversion efficiency and the gradient utilization efficiency of low-grade heat of boiler flue gas to high-grade heat are further improved, and the heat pump effect is prominent.
When the supply air heater 8 is disposed at the inlet of the blower 6, the supply air heater 8 may be disposed in a detachable manner (for example, may be in a hanging manner, or may be detachably connected or turned over). That is, the blower heater 8 may be separated from the inlet of the blower 6, for the purpose of: when the blower heater 8 is normally used, the blower heater 8 can be brought into close contact with the inlet of the blower 6. When the summer ambient temperature is high, the blowing heater 8 can be separated when the blowing heating capability is poor, so that the blowing heater 8 and the inlet of the blower 6 are separated by a certain distance, and the inlet resistance of the blower 6 is reduced. The utility model provides an energy-conserving white device that disappears of boiler flue gas not only can fully retrieve the flue gas waste heat, has obvious heat pump effect moreover, can promote the grade and the utilization efficiency of retrieving the heat energy, can also pass through the reduction of flue gas temperature simultaneously, improve electrostatic precipitator's dust collection efficiency, desulfurizing tower desulfurization efficiency, it carries to reduce moisture and the pollutant of discharging fume, it emits the white cigarette phenomenon to reduce the chimney, reduce the water consumption, retrieve part water, play energy-conservation, the effect of environmental protection simultaneously.
It is to be understood by those skilled in the art that while the present invention has been described in terms of several embodiments, it is not intended that each embodiment cover a separate embodiment. The description is given for clearness of understanding only, and it is to be understood that all matters in the embodiments are to be interpreted as including all technical equivalents which are encompassed by the claims.
The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention.

Claims (12)

1. The utility model provides an energy-conserving white device that disappears of boiler flue gas, its characterized in that, its include the boiler and through the flue with air heater, dust remover, draught fan, desulfurization absorption tower, chimney that the boiler is connected in proper order, air heater has through the supply air duct connection the air intake and the forced draught blower of boiler, the entry or the export of forced draught blower are equipped with air supply heater, air supply heater is equipped with hot media water inlet and hot media water outlet, hot media water inlet with flue gas waste heat exchanger and hot media water cooling device have connected gradually through hot media water pipeline between the hot media water outlet.
2. The boiler flue gas energy-saving and whitening reduction device according to claim 1, wherein the desulfurization absorption tower is provided with a slurry circulating pipe, and the flue gas waste heat exchanger is arranged on the slurry circulating pipe.
3. The boiler flue gas energy-saving and whitening reduction device according to claim 1, wherein the flue gas waste heat exchanger is arranged on a flue of an inlet or an outlet of the desulfurization absorption tower.
4. The boiler flue gas energy-saving and whitening reduction device according to claim 3, wherein the flue gas waste heat exchanger is a hybrid heat exchanger.
5. The boiler flue gas energy-saving and whitening reduction device according to claim 1, wherein the flue gas waste heat exchanger is arranged in a desulfurizing tower.
6. The boiler flue gas energy-saving and whitening elimination device according to claim 1, wherein the flue gas waste heat exchanger is a water spray tower, and the water spray tower is arranged on the upper part of the desulfurization absorption tower or on an outlet flue of the desulfurization absorption tower or in the chimney.
7. The boiler flue gas energy-saving and whitening reduction device according to claim 1, wherein the heat medium water cooling device is a mechanical draft tower or a water spraying tower or an air cooling tower or a heat pump or an external cold source.
8. The boiler flue gas energy-saving and whitening reduction device according to claim 1, wherein the hot water cooling device is connected with a hot water bypass and a control valve in parallel.
9. The boiler flue gas energy-saving and whitening reduction device according to claim 1, wherein the supply air heater is connected with a first hot water bypass and a control valve in parallel.
10. The boiler flue gas energy-saving and whitening reduction device according to claim 1, wherein a first flue gas waste heat exchanger is arranged on a flue between the air preheater and the dust remover.
11. The boiler flue gas energy-saving and whitening reduction device according to claim 1, wherein the air preheater is provided with a second flue gas waste heat exchanger in parallel.
12. The boiler flue gas energy-saving and whitening reduction device according to claim 1, wherein a third flue gas waste heat exchanger is arranged at an inlet or an outlet of the induced draft fan.
CN201820472363.9U 2018-04-04 2018-04-04 A kind of boiler smoke energy conservation disappears white device Active CN208365564U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110145756A (en) * 2019-05-31 2019-08-20 浙江特富锅炉有限公司 Smoke whitening system of heating boiler
CN111156536A (en) * 2019-12-28 2020-05-15 南京楚卿电子科技有限公司 Waste heat recovery economizer system of thermal power plant

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110145756A (en) * 2019-05-31 2019-08-20 浙江特富锅炉有限公司 Smoke whitening system of heating boiler
CN110145756B (en) * 2019-05-31 2023-12-22 浙江特富锅炉有限公司 Flue gas whitening system of heating boiler
CN111156536A (en) * 2019-12-28 2020-05-15 南京楚卿电子科技有限公司 Waste heat recovery economizer system of thermal power plant

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