CN209415493U

CN209415493U - The absorption boiler flue gas treatment system of twin-stage

Info

Publication number: CN209415493U
Application number: CN201822042819.0U
Authority: CN
Inventors: 李震; 张晓跃; 吴俊达; 何智光
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2018-12-06
Filing date: 2018-12-06
Publication date: 2019-09-20
Anticipated expiration: 2028-12-06

Abstract

The utility model provides a kind of absorption boiler flue gas treatment system of twin-stage, including condensing unit, first absorber, first regenerator, second absorber and Second reactivator, boiler sequentially concatenates the first regenerator of connection by flue, condensing unit, first absorber, second absorber, first regenerator is connected to by the first inlet tube and the first drain pipe with the first absorber, first regenerator is connected to by jet chimney with Second reactivator, Second reactivator is connected to by the second inlet tube and the second drain pipe with the second absorber, Second reactivator is connected to by combustion-aid air pipe with boiler.The utility model can achieve the effect that with lower cost-effective Mist heat recovering and moisture, the content for avoiding soluble nitrogen oxide in flue gas that nitrogen oxides in smoke evacuation is polluted, reduced to hygroscopic solution.

Description

The absorption boiler flue gas treatment system of twin-stage

Technical field

The utility model relates to boiler smoke processing technology fields, refer in particular to a kind of absorption boiler smoke processing of twin-stage System.

Background technique

With the propulsion of gas replacing coal project, gas fired-boiler in heating using more and more extensive.The row of gas fired-boiler Cigarette water capacity (water vapour content) is significantly larger than the water capacity of coal-burning boiler, and vapor carries a large amount of latent heat, waste heat recycling Potentiality are very big.Existing flue gas waste heat recovery mode mainly has condensing waste heat recycling (condensing boiler), electric compression heat pump waste heat Recycling, the recycling of enclosed absorption heat pump waste heat, the open type absorbent formula residual neat recovering system based on solution dehumidification technology.

But it finds in existing waste heat and moisture removal process, using pure electric compression heat pump, need to will be heated back by heat pump Coolant-temperature gage is reduced to the dew-point temperature of flue gas hereinafter, since the electricity charge are higher, causes the operating cost of Mist heat recovering higher.It closes Formula/open absorption heat pump often uses natural gas direct combustion as heat source, needs additionally to lay natural gas line and flue, system Complicated and cost is higher.And flue gas and circulation are situated between currently based on the open type absorbent formula residual neat recovering system of solution dehumidification technology Matter (solution) directly contacts, and more serious pollution can be caused to solution, and nitrogen oxides emission reduction is not also significant.Therefore how to have Effect Mist heat recovering and moisture under the premise of reduce cost, reduce flue gas in nitrogen oxides opposite opened absorption system in inhale Wet solution pollutes and improves nitrogen oxides emission reduction effect as those skilled in the art's urgent problem to be solved.

Utility model content

The purpose of the utility model is to provide a kind of absorption boiler flue gas treatment systems of twin-stage, to solve at existing flue gas Manage that at high cost, nitrogen oxides in effluent opposite opened absorption system hygroscopic solution pollutes and nitrogen oxides emission reduction effect is bad The problem of.

A kind of in order to achieve the above object, the utility model provides absorption boiler flue gas treatment system of twin-stage, wherein institute Stating the absorption boiler flue gas treatment system of twin-stage includes condensing unit, the first absorber, the first regenerator, the second absorber and Two regenerators, boiler sequentially concatenate connection first regenerator, the condensing unit, first absorption by flue Device, second absorber, first regenerator are connected by the first inlet tube and the first drain pipe and first absorber Logical, first regenerator is connected to by jet chimney with the Second reactivator, and the Second reactivator passes through the second feed liquor Pipe and the second drain pipe are connected to second absorber, and the Second reactivator is connected by combustion-aid air pipe and the boiler It is logical.

The absorption boiler flue gas treatment system of twin-stage as described above, wherein the condensing unit includes that condensing tower, water follow Endless tube, First Heat Exchanger and lye tank, the both ends of the water-circulating pipe respectively with the top of the condensing tower, the condensing tower Bottom connection, the First Heat Exchanger is set on the water-circulating pipe, and the First Heat Exchanger is changed with the first back-flowing and branched pipe It is thermally connected, the first back-flowing and branched pipe is connected to the water return pipeline of the boiler, and the water-circulating pipe is equipped with energy will be described Liquid in condensing tower is delivered to first pump housing at the top of the condensing tower by the bottom of the condensing tower, and the lye tank is logical It crosses lye supply pipe to be connected to the bottom of the condensing tower, the lye supply pipe is equipped with can be by the lye in the lye tank It is delivered to second pump housing of the condensing tower, and the lye supply pipe is equipped with the liquid in the condensing tower can be prevented along institute The check-valves that lye supply pipe flow to the lye tank is stated, the check-valves is located at the lye supply pipe and the condensing tower Between connectivity part and second pump housing；Liquid discharging tube, the liquid discharging tube and the water-circulating pipe are communicated on the water-circulating pipe Between connectivity part be located between the water-circulating pipe and the connectivity part and the First Heat Exchanger of the condensing tower, the tapping Pipe is equipped with bleeder valve.

The absorption boiler flue gas treatment system of twin-stage as described above, wherein the first end of first drain pipe and institute The bottom connection of the first absorber is stated, the second end of first drain pipe is connected to the top of first regenerator, described The first end of first inlet tube is connected to the bottom of first regenerator, the second end of first inlet tube and described first The top of absorber is connected to, and first drain pipe, which is equipped with, to be delivered to described first for the liquid in first absorber The third pump housing of regenerator, first inlet tube, which is equipped with, to be delivered to described first for the liquid in first regenerator 4th pump housing of absorber, first inlet tube are equipped with the second heat exchanger, second heat exchanger and second back-flowing and branched Pipe heat exchange connection, the second back-flowing and branched pipe are connected to the water return pipeline of the boiler.

The absorption boiler flue gas treatment system of twin-stage as described above, wherein first regenerator and described first is inhaled It receives and is equipped with regenerator between device, the second end of first drain pipe runs through the top of the regenerator and first regenerator The first end of connection, first inlet tube is connected to through the regenerator with the bottom of first regenerator, and described first Drain pipe and first inlet tube are in the internal heat of the regenerator.

The absorption boiler flue gas treatment system of twin-stage as described above, wherein first drain pipe with described first into Between liquid pipe by liquid back pipe be connected to, between the liquid back pipe and first drain pipe or the liquid back pipe with described first into It is connected between liquid pipe by triple valve.

The absorption boiler flue gas treatment system of twin-stage as described above, wherein the first end of second drain pipe and institute The bottom connection of the second absorber is stated, the second end of second drain pipe is connected to the top of the Second reactivator, described The first end of second inlet tube is connected to the bottom of the Second reactivator, the second end of second inlet tube and described second The top of absorber is connected to, and second drain pipe, which is equipped with, to be delivered to described second for the liquid in second absorber 5th pump housing of regenerator, second inlet tube, which is equipped with, to be delivered to described second for the liquid in the Second reactivator 6th pump housing of absorber, second inlet tube are equipped with third heat exchanger, the third heat exchanger and the combustion air Pipe heat exchange connection, the combustion-aid air pipe concatenation are connected to the Second reactivator and are connected to the boiler.

The absorption boiler flue gas treatment system of twin-stage as described above, wherein the Second reactivator connection, which is equipped with, takes out very Blank pipe, the vacuum-pumping tube are equipped with vacuum pump.

The absorption boiler flue gas treatment system of twin-stage as described above, wherein the Second reactivator connection is equipped with condensate Delivery pipe, the condensate delivery pipe are equipped with the 7th pump housing.

The absorption boiler flue gas treatment system of twin-stage as described above, wherein the bottom connection of first absorber is set There is the first sewage pipe, first sewage pipe is equipped with the first blowdown valve, and the bottom connection of second absorber is equipped with second Sewage pipe, second sewage pipe are equipped with the second blowdown valve.

The absorption boiler flue gas treatment system of twin-stage as described above, wherein first regenerator is shell-and-tube regeneration Device, the Second reactivator are the board-like regenerator of interior heat type.

Compared with prior art, as follows the advantages of the utility model:

1, the absorption boiler flue gas treatment system of twin-stage provided by the utility model is not needed using electric compression heat pump or day Right heat pump of the gas direct combustion as heat source, does not need additionally to be laid with natural gas line, and can effectively reach reduces fume afterheat and moisture The effect of cost recovery, while by setting condensing unit, it can be before flue gas enters the first absorber to solvable in flue gas Property nitrogen oxides is absorbed, and effectively prevents pollution of the soluble nitrogen oxide to hygroscopic solution in flue gas, while improving nitrogen Oxide emission reduction effect, therefore, in the flue gas of the absorption boiler flue gas treatment system discharge of twin-stage provided by the utility model, nitrogen Oxide content and smoke evacuation humidity are reduced, and facilitate Tuo Bai and alleviation haze is formed, bring ecological benefits.

2, the absorption boiler flue gas treatment system of twin-stage provided by the utility model, by the way that the first absorber and second is arranged Absorber two-stage absorber can carry out step recycling to moisture in flue gas and waste heat, and make the first absorber and the second absorber It is possibly realized using different solution, it is molten that the solution of the first absorber can be used that wettability power is weaker but cheap, corrosivity is weak Liquid；The solution of second absorber can be regenerated using the strong solution of wettability power and using non-boiling formula again.

3, the absorption boiler flue gas treatment system of twin-stage provided by the utility model, by the way that the first regenerator and second is arranged Regenerator two-stage regenerator can utilize twice fume afterheat, under the premise of the power of regeneration for guaranteeing two-stage regenerator, be mentioned High flue gas waste heat recovery effect.

4, the absorption boiler flue gas treatment system of twin-stage provided by the utility model, by the way that combustion-aid air pipe is arranged, and it is right Combustion air warming and humidifying in combustion-aid air pipe, advantageously reduces the production quantity of nitrogen oxides during fuel gas buring, from root Achieve the effect that nitrogen oxides emission reduction on source.

Detailed description of the invention

Following drawings are only intended to schematically illustrate and explain the present invention, does not limit the model of the utility model It encloses.Wherein:

Fig. 1 is the structural schematic diagram of the absorption boiler flue gas treatment system of twin-stage provided by the utility model；

Fig. 2 is another structural schematic diagram of the absorption boiler flue gas treatment system of twin-stage provided by the utility model.

Drawing reference numeral explanation:

1, condensing unit；

11, condensing tower；

12, water-circulating pipe；

121, first pump housing；

13, First Heat Exchanger；

131, the first back-flowing and branched pipe；

14, lye tank；

15, lye supply pipe；

151, second pump housing；

152, check-valves；

16, liquid discharging tube；

161, bleeder valve；

2, the first absorber；

21, the first inlet tube；

211, the 4th pump housing；

212, the second heat exchanger；

2121, the second back-flowing and branched pipe；

22, the first drain pipe；

221, the third pump housing；

23, liquid back pipe；

231, triple valve；

24, the first sewage pipe；

241, the first blowdown valve；

3, the first regenerator；

31, jet chimney；

4, the second absorber；

41, the second inlet tube；

411, the 6th pump housing；

412, third heat exchanger；

42, the second drain pipe；

421, the 5th pump housing；

43, the second sewage pipe；

431, the second blowdown valve；

5, Second reactivator；

51, vacuum-pumping tube；

511, vacuum pump；

52, condensate delivery pipe；

521, the 7th pump housing；

6, regenerator；

7, boiler；

71, flue；

72, combustion-aid air pipe；

8, chimney；

9, air-introduced machine

Specific embodiment

In order to have clearer understanding to the technical solution of the utility model, purpose and effect, now in conjunction with Detailed description of the invention sheet The specific embodiment of utility model.

As shown in Figures 1 and 2, the utility model provides a kind of absorption boiler flue gas treatment system of twin-stage, wherein double The absorption boiler flue gas treatment system of grade includes condensing unit 1, the first absorber 2, the first regenerator 3, the second absorber 4 and the Two regenerators 5, boiler 7 sequentially concatenates by flue 71 and are connected to the first regenerator 3, condensing unit 1, the first absorber 2, the Two absorbers 4, the first regenerator 3 are connected to by the first inlet tube 21 and the first drain pipe 22 with the first absorber 2, the first regeneration Device 3 is connected to by jet chimney 31 with Second reactivator 5, and Second reactivator 5 passes through the second inlet tube 41 and the second drain pipe 42 It is connected to the second absorber 4, Second reactivator 5 is connected to by combustion-aid air pipe 72 with boiler 7.

To flue gas, in the process of processing, flue gas initially enters the first regenerator 3, the heat as the first regenerator 3 Part of waste heat in flue gas is supplied to the hygroscopic solution that the first regenerator 3 is used to heat the first regenerator 3, again by first by source Hygroscopic solution in raw device 3, which is heated to boiling, is concentrated by evaporation hygroscopic solution, and hygroscopic solution heats steaming in the first regenerator 3 The vapor that hair generates enters the concentrating regenerative that Second reactivator 5 is hygroscopic solution in Second reactivator 5 by jet chimney 31 Heat is provided, so can effectively realize the recycling of fume afterheat, while not needing setting electric compression heat pump or natural gas straight The heat pump as heat source is fired, does not need additionally to be laid with natural gas line, reduces cigarette while effective Mist heat recovering can be reached The purpose of gas waste heat cost recovery；

Then flue gas is entered in condensing unit 1 by flue 71, is contacted simultaneously in condensing unit 1 with recirculated cooling water Condensation realizes the preliminary water removal of flue gas and further cools down, while passing through recirculated cooling water for the soluble nitrogen oxygen in flue gas Compound absorbs, and prevents flue gas from polluting to the hygroscopic solution in the first absorber 2 and the second absorber 4, while reaching nitrogen oxygen The effect of compound emission reduction；

Then, flue gas is entered in the first absorber 2 by flue 71, and the hygroscopic solution in the first absorber 2 is to cigarette Moisture in gas is absorbed, and the hygroscopic solution in the first absorber 2 is diluted after absorbing the moisture in flue gas, diluted suction Wet solution by the first drain pipe 22 enter the first regenerator 3 in, by flue gas as regenerator heat source to diluted moisture absorption Solution carries out ebuillition of heated concentration, and the hygroscopic solution after concentration is returned in the first absorber 2 by the first inlet tube 21；And pass through The flue gas of first absorber 2 recycling moisture then passes through flue 71 and enters in the second absorber 4, then by the second absorber 4 Interior hygroscopic solution further absorbs the moisture in flue gas, and the hygroscopic solution in the second absorber 4 is in flue gas Moisture absorbed after be diluted, the hygroscopic solution being diluted by the second drain pipe 42 enter Second reactivator 5 in, with The vapor that first regenerator 3 generates interior heat diluted hygroscopic solution and makes to inhale as the Second reactivator 5 of heat source The direct counter current contacting in Second reactivator 5 is dense by hygroscopic solution with combustion air dry in combustion-aid air pipe 72 for wet solution Contracting, the combustion air in combustion-aid air pipe 72 is heated humidification at the same time, and the hygroscopic solution after concentration passes through the second inlet tube 41 return in the second absorber 4, and the hygroscopic solution in such first absorber 2 and the second absorber 4 is recycled successively to cigarette Moisture in gas is absorbed, and effectively reduces smoke evacuation humidity, the white effect that disappears is obvious；Finally by the second absorber 4 The flue gas of recycling moisture enters chimney 8 by air-introduced machine 9 and is emitted into atmosphere.

Further, as shown in Figures 1 and 2, the absorption boiler flue gas treatment system of twin-stage provided by the utility model, In, condensing unit 1 includes condensing tower 11, water-circulating pipe 12, First Heat Exchanger 13 and lye tank 14, and condensing tower 11 is directly to contact Formula condenser, specially spray (filler) tower, the both ends of water-circulating pipe 12 bottom with the top of condensing tower 11, condensing tower 11 respectively Portion's connection, sprays the recirculated cooling water in condensing tower 11 downwards by the top of condensing tower 11, and logical in the bottom of condensing tower 11 The top that water-circulating pipe 12 flows back into condensing tower 11 again is crossed, realizes the circulation of recirculated cooling water, in recirculated cooling water circulation In the process, solubility nox adsorption contained in the flue gas of condensing tower 11 will be entered, simultaneously because recirculated cooling water is cold But effect makes flue gas cool-down, while the part vapor condensation in flue gas and flowing away circulation with recirculated cooling water, so reaches Part polluted gas, the purpose that cooling is carried out to flue gas and is tentatively removed water into removal flue gas；First Heat Exchanger 13 is followed set on water On endless tube 12, and First Heat Exchanger 13 and the first back-flowing and branched heat exchange of pipe 131 connect, the first back-flowing and branched pipe 131 and boiler 7 Water return pipeline connection, recirculated cooling water can absorb the heat of flue gas and rise during from top to bottom spray in condensing tower 11 Temperature, by the way that First Heat Exchanger 13 is arranged on water-circulating pipe 12, the heat that can absorb recirculated cooling water is in a manner of heat exchange The boiler blow-down water in the first back-flowing and branched pipe 131 is passed to, realizes the recycling of fume afterheat；Water-circulating pipe 12 is equipped with energy Liquid in condensing tower 11 is delivered to first pump housing 121 at the top of condensing tower 11 by the bottom of condensing tower 11, to guarantee to follow Ring cooling water smooth circulation；Lye tank 14 is connected to by lye supply pipe 15 with the bottom of condensing tower 11, in lye supply pipe 15 Equipped with second pump housing 151 that the lye in lye tank 14 can be delivered to condensing tower 11, by conveying lye into condensing tower 11, Recirculated cooling water can be made in alkalinity, so as to further improve recirculated cooling water to the assimilation effect of nitrogen oxides, as It is preferred that lye is wet chemical, potassium carbonate, which absorbs the potassium nitrate generated after soluble nitrogen oxide, can be used for the life of chemical fertilizer It produces；And lye supply pipe 15 is equipped with the non-return that the liquid in condensing tower 11 can be prevented to flow to lye tank 14 along lye supply pipe 15 Valve 152, check-valves 152 are located between the connectivity part of lye supply pipe 15 and condensing tower 11 and second pump housing 151, are stopped by setting Returning valve 152 can prevent the liquid reflux in condensing tower 11 from polluting into lye tank 14 to the lye in lye tank 14；Water follows Liquid discharging tube 16 is communicated on endless tube 12, the connectivity part between liquid discharging tube 16 and water-circulating pipe 12 is located at water-circulating pipe 12 and condensing tower Between 11 connectivity part and First Heat Exchanger 13, liquid discharging tube 16 is equipped with bleeder valve 161, by setting liquid discharging tube 16 and in tapping Bleeder valve 161 is set on pipe 16, periodically the recirculated cooling water in condensing tower 11 can be discharged for staff, to guarantee The alkalinity for guaranteeing recirculated cooling water under the premise of liquid measure, avoids because part condensate moisture keeps the circulation in condensing tower 11 cold in flue gas But water increases accumulation；In addition, the connectivity part between liquid discharging tube 16 and water-circulating pipe 12 can also be located at water-circulating pipe 12 and condensation Between the connectivity part and First Heat Exchanger 13 at the top of tower 11, make recirculated cooling water after the outflow of the bottom of condensing tower 11 with first Heat exchanger 13 is discharged again after exchanging heat, further raising fume afterheat utilization efficiency.

Further, as shown in Figures 1 and 2, the absorption boiler flue gas treatment system of twin-stage provided by the utility model, In, the first end of the first drain pipe 22 is connected to the bottom of the first absorber 2, the second end of the first drain pipe 22 and the first regeneration The top of device 3 is connected to, and the first end of the first inlet tube 21 is connected to the bottom of the first regenerator 3, and the second of the first inlet tube 21 End is connected to the top of the first absorber 2, and the hygroscopic solution in the first absorber 2 is absorbed after absorbing the moisture in flue gas by first The bottom of device 2 is flowed by the first drain pipe 22 to be heated to boiling in first regenerator 3 and is concentrated, the moisture absorption of obtained concentration Solution is entered in the first absorber 2 by the first inlet tube 21 from the top of the first absorber 2 by the bottom of the first regenerator 3 Portion, and spray from top to bottom, the hygroscopic solution and smoke contacts after being concentrated during spray simultaneously absorb the water in flue gas again Point, it so recycles, the moisture in flue gas is recycled；First drain pipe 22 is equipped with can be by the liquid in the first absorber 2 It is delivered to the third pump housing 221 of the first regenerator 3, the first inlet tube 21 is equipped with and can convey the liquid in the first regenerator 3 To the 4th pump housing 211 of the first absorber 2, the first absorber 2 can guarantee by the setting third pump housing 221 and the 4th pump housing 211 The smooth circulation of interior hygroscopic solution；First inlet tube 21 is equipped with the second heat exchanger 212, the second heat exchanger 212 and second time The heat exchange connection of moisture branch pipe 2121, the second back-flowing and branched pipe 2121 is connected to the water return pipeline of boiler 7, hygroscopic solution first again There is very high temperature after heating in raw device 3, will can effectively be inhaled after flowing into the first inlet tube 21 by the second heat exchanger 212 The heat of wet solution exchanges the recycling benefit that the heat of hygroscopic solution is realized to the boiler blow-down water in the second back-flowing and branched pipe 2121 With.

Further, as shown in Figures 1 and 2, the absorption boiler flue gas treatment system of twin-stage provided by the utility model, Wherein, regenerator 6 is equipped between the first regenerator 3 and the first absorber 2, the second end of the first drain pipe 22 runs through regenerator 6 It is connected to the top of the first regenerator 3, the first end of the first inlet tube 21 connects through the bottom of regenerator 6 and the first regenerator 3 Logical, the first drain pipe 22 and the first inlet tube 21 are in the internal heat of regenerator 6.It can be to the first drain by setting regenerator 6 Diluted hygroscopic solution in pipe 22 is preheated, and diluted hygroscopic solution is made to enter the first regenerator 3 progress heating evaporation Before it is temperature with higher, the burden of heating evaporation is carried out to reduce the first regenerator 3 to diluted hygroscopic solution, simultaneously The temperature of the hygroscopic solution after being concentrated in the first regenerator 3 can also tentatively be reduced.

Further, as shown in Fig. 2, the absorption boiler flue gas treatment system of twin-stage provided by the utility model, wherein It is connected between first drain pipe 22 and the first inlet tube 21 by liquid back pipe 23, between liquid back pipe 23 and the first drain pipe 22 or is returned It is connected between liquid pipe 23 and the first inlet tube 21 by triple valve 231.It can to lead to triple valve 231 by setting liquid back pipe 23 The first drain pipe 22 is crossed to enter in the first regenerator 3 from the diluted hygroscopic solution only a fraction being discharged in the first absorber 2 It is heated to boiling and is concentrated, can so reduce the first regenerator 3 for solution and be heated to boiling institute's calorific requirement, effectively improve twin-stage Burden is concentrated in the power of regeneration of absorption boiler flue gas treatment system, the heating for reducing the first regenerator 3, to reduce first again The size of raw device 3, while the heat exchange burden of the second heat exchanger 212 is reduced, reduce the size of the second heat exchanger 212.

Further, as shown in Figures 1 and 2, the absorption boiler flue gas treatment system of twin-stage provided by the utility model, In, the first end of the second drain pipe 42 is connected to the bottom of the second absorber 4, the second end of the second drain pipe 42 and the second regeneration The top of device 5 is connected to, and the first end of the second inlet tube 41 is connected to the bottom of Second reactivator 5, and the second of the second inlet tube 41 End is connected to the top of the second absorber 4, and the hygroscopic solution in the second absorber 4 is absorbed after absorbing the moisture in flue gas by second The bottom of device 4 is flowed into Second reactivator 5 by the second drain pipe 42 and carries out concentrating regenerative, the hygroscopic solution of obtained concentration by The bottom of Second reactivator 5 enters the inside of the second absorber 4 by the second inlet tube 41 from the top of the second absorber 4, and It sprays from top to bottom, the hygroscopic solution and smoke contacts after being concentrated during spray simultaneously absorb the moisture in flue gas again, such as This circulation, the moisture in flue gas is recycled；Second drain pipe 42, which is equipped with, to be delivered to second for the liquid in the second absorber 4 5th pump housing 421 of regenerator 5, the second inlet tube 41, which is equipped with, to be delivered to the second absorption for the liquid in Second reactivator 5 6th pump housing 411 of device 4 can guarantee the smooth circulation of hygroscopic solution by the 5th pump housing 421 of setting and the 6th pump housing 411；The Two inlet tubes 41 are equipped with third heat exchanger 412, and third heat exchanger 412 and the heat exchange of combustion-aid air pipe 72 connect, combustion-aid air pipe 72 concatenation connection Second reactivators 5 are simultaneously connected to, hygroscopic solution temperature with higher after Second reactivator 5 with boiler 7, The heat of hygroscopic solution can be exchanged to helping in combustion-aid air pipe 72 after flowing into the second inlet tube 41 by third heat exchanger 412 Air is fired, the temperature of the hygroscopic solution in the second absorber 4 is lowered into, promotes the wettability power of hygroscopic solution.

Further, as shown in Figures 1 and 2, the absorption boiler flue gas treatment system of twin-stage provided by the utility model, Wherein, the connection of Second reactivator 5 is equipped with vacuum-pumping tube 51, and vacuum-pumping tube 51 is connected to the heating plate inner cavity of Second reactivator 5, takes out Vacuum tube 51 is equipped with vacuum pump 511, since the heating plate inner cavity of the first regenerator 3 and Second reactivator 5 passes through jet chimney 31 connections can be such that the hygroscopic solution in the first regenerator 3 contains low-pressure low-temperature is low by setting vacuum-pumping tube 51 and vacuum pump 511 It is regenerated in the state of oxygen, reduces corrosion of the hygroscopic solution to the first regenerator 3, while passing through vacuum-pumping tube 51 and vacuum pump 511 Take the fixed gas in the heating plate inner cavity of Second reactivator 5 in heat source vapor away, in time to promote vapor in the second regeneration Condensation effect in device 5 improves the heat exchange efficiency of Second reactivator 5 and maintains the vacuum degree in the first regenerator 3；Boiler 7 Return water is latter with boiler 7 is entered by the preheating of First Heat Exchanger 13 and the second heat exchanger 212, reduces combustion gas in boiler 7 Consumption, the connection of Second reactivator 5 are equipped with condensate delivery pipe 52, and condensate delivery pipe 52 is equipped with the 7th pump housing 521, in addition to this Condensation tank can also be arranged to be connected to condensate delivery pipe 52, the condensed water obtained after condensation is high-quality condensate, can be by solidifying Water discharge spout 52 is discharged into condensation tank directly as the moisturizing of boiler 7.

Further, as shown in Figures 1 and 2, the absorption boiler flue gas treatment system of twin-stage provided by the utility model, In, the connection of the bottom of the first absorber 2 is equipped with the first sewage pipe 24, and the first sewage pipe 24 is equipped with the first blowdown valve 241, and second The bottom connection of absorber 4 is equipped with the second sewage pipe 43, and the second sewage pipe 43 is equipped with the second blowdown valve 431.Pass through setting the One sewage pipe 24, the first blowdown valve 241, the second sewage pipe 43 and the second blowdown valve 431 can inhale the first absorber 2 and second The hygroscopic solution received in device 4 carries out discharge replacement, to guarantee the cleaning of hygroscopic solution.

Preferably, the absorption boiler flue gas treatment system of twin-stage provided by the utility model, wherein the first regenerator 3 For shell-and-tube regenerator, the hygroscopic solution of the first absorber 2 absorbs in flue gas itself to be diluted after moisture, and the moisture absorption being diluted is molten The shell-side that liquid enters the first regenerator of shell-and-tube 3 after the preheating of regenerator 6 is concentrated after being boiled by the high-temperature flue gas of pipe side, after concentration Solution further cooled down in the second heat exchanger 212 by boiler blow-down water after regenerator 6 is tentatively cooling, absorbed subsequently into first Device 2 absorbs the moisture in flue gas, completes a circulation；Second reactivator 5 is the board-like regenerator of interior heat type, board-like again from interior heat type The hygroscopic solution being concentrated that raw device comes out enters the second absorber by spray after cold air cooling in third heat exchanger 412 4 directly contact with flue gas, and it is dense that the hygroscopic solution being diluted after moisture in absorption flue gas is again introduced into the board-like regenerator of interior heat type A circulation is completed in contracting regeneration.In the interior board-like Second reactivator 5 of heat type, hygroscopic solution is in the form of falling liquid film in heating plate plate On flow from above to below, hygroscopic solution of the heat source vapor in the inner cavity of heating plate to flow on heating plates exchanges heat in third The hygroscopic solution that combustion air after being preheated in device 412 by hygroscopic solution is flowed from bottom to top between plate and flowed on plate is direct It contacts and concentrating regenerative is carried out to hygroscopic solution and itself be heated humidification simultaneously, the combustion air after warming and humidifying enters boiler 7 In it is combustion-supporting.

Preferably, the absorption boiler flue gas treatment system of twin-stage provided by the utility model, wherein since flue gas enters Water capacity is also higher when the first absorber 2 and the first regenerator 3 is boiling type regeneration (etching problem is more prominent), and first The hygroscopic solution recycled between absorber 2 and the first regenerator 3 can choose slightly weak but cheap, corrosivity the is weak suction of wettability power Wet solution, to mitigate corrosion of the hygroscopic solution to the first regenerator 3, since water capacity is lower when flue gas enters the second absorber 4 And Second reactivator 5 selects the board-like countercurrent falling-film regeneration of interior heat type, recycles between the second absorber 4 and Second reactivator 5 Hygroscopic solution excessively can not scruple solution corrosion and the solution of selecting wettability power strong, to improve flue gas moisture and waste heat recycling Effect reduces final smoke evacuation water capacity.

Preferably, the absorption boiler flue gas treatment system of twin-stage provided by the utility model, wherein first is back-flowing and branched Pipe 131 and the second back-flowing and branched pipe 2121 be connected to respectively with water return pipeline in parallel or the first back-flowing and branched pipe 131 and Second back-flowing and branched pipe 2121 sequentially connects in series and is connected to water return pipeline, the utility model not as Limit.

It should be noted that in the present invention, flue gas in the first absorber 2 with the flowing in the second absorber 4 Direction can be passes through the first absorber 2 and the second absorber 4 (adverse current) from bottom to top, or can also be horizontally through the first suction Device 2 and the second absorber 4 (distributary) are received, the utility model is not limited thereto.

Compared with prior art, as follows the advantages of the utility model:

The above descriptions are merely exemplary embodiments of the present utility model, the model being not intended to limit the utility model It encloses.Any those skilled in the art, it is made etc. under the premise of not departing from the conceptions and principles of the utility model With variation and modification, the range of the utility model protection should belong to.

Claims

1. a kind of absorption boiler flue gas treatment system of twin-stage, which is characterized in that the absorption boiler smoke processing system of twin-stage System includes that condensing unit, the first absorber, the first regenerator, the second absorber and Second reactivator, boiler pass through flue Sequentially concatenation is connected to first regenerator, the condensing unit, first absorber, second absorber, and described the One regenerator is connected to by the first inlet tube and the first drain pipe with first absorber, and first regenerator passes through steam Pipeline is connected to the Second reactivator, and the Second reactivator is inhaled by the second inlet tube and the second drain pipe and described second Device connection is received, the Second reactivator is connected to by combustion-aid air pipe with the boiler.

2. the absorption boiler flue gas treatment system of twin-stage according to claim 1, which is characterized in that the condensing unit packet Include condensing tower, water-circulating pipe, First Heat Exchanger and lye tank, the both ends of the water-circulating pipe top with the condensing tower respectively The bottom connection in portion, the condensing tower, the First Heat Exchanger is set on the water-circulating pipe, and the First Heat Exchanger and the One back-flowing and branched pipe heat exchange connection, the first back-flowing and branched pipe are connected to the water return pipeline of the boiler, the water-circulating pipe It is equipped with the first pump that the liquid in the condensing tower can be delivered to the top of the condensing tower by the bottom of the condensing tower Body, the lye tank are connected to by lye supply pipe with the bottom of the condensing tower, and the lye supply pipe is equipped with can be by institute Second pump housing that the lye in lye tank is delivered to the condensing tower is stated, and the lye supply pipe is described cold equipped with that can prevent Liquid in solidifying tower flow to the check-valves of the lye tank along the lye supply pipe, and the check-valves is located at lye supply Between pipe and the connectivity part and second pump housing of the condensing tower；Liquid discharging tube, the tapping are communicated on the water-circulating pipe The connectivity part that connectivity part between pipe and the water-circulating pipe is located at the water-circulating pipe and the condensing tower is changed with described first Between hot device, the liquid discharging tube is equipped with bleeder valve.

3. the absorption boiler flue gas treatment system of twin-stage according to claim 1, which is characterized in that first drain pipe First end be connected to the bottom of first absorber, the second end of first drain pipe is upper with first regenerator Portion's connection, the first end of first inlet tube are connected to the bottom of first regenerator, and the second of first inlet tube End is connected to the top of first absorber, and first drain pipe is equipped with can be defeated by the liquid in first absorber It send to the third pump housing of first regenerator, first inlet tube is equipped with can be defeated by the liquid in first regenerator Send to the 4th pump housing of first absorber, first inlet tube is equipped with the second heat exchanger, second heat exchanger with Second back-flowing and branched pipe heat exchange connection, the second back-flowing and branched pipe are connected to the water return pipeline of the boiler.

4. the absorption boiler flue gas treatment system of twin-stage according to claim 1, which is characterized in that first regenerator Regenerator is equipped between first absorber, the second end of first drain pipe runs through the regenerator and described first The top of regenerator is connected to, and the first end of first inlet tube connects through the bottom of the regenerator and first regenerator Logical, first drain pipe and first inlet tube are in the internal heat of the regenerator.

5. the absorption boiler flue gas treatment system of twin-stage according to claim 1, which is characterized in that first drain pipe It is connected between first inlet tube by liquid back pipe, between the liquid back pipe and first drain pipe or the liquid back pipe It is connected between first inlet tube by triple valve.

6. the absorption boiler flue gas treatment system of twin-stage according to claim 1, which is characterized in that second drain pipe First end be connected to the bottom of second absorber, the second end of second drain pipe is upper with the Second reactivator Portion's connection, the first end of second inlet tube are connected to the bottom of the Second reactivator, and the second of second inlet tube End is connected to the top of second absorber, and second drain pipe is equipped with can be defeated by the liquid in second absorber It send to the 5th pump housing of the Second reactivator, second inlet tube is equipped with can be defeated by the liquid in the Second reactivator Send to the 6th pump housing of second absorber, second inlet tube is equipped with third heat exchanger, the third heat exchanger with The combustion-aid air pipe heat exchange connection, the combustion-aid air pipe concatenation are connected to the Second reactivator and are connected to the boiler.

7. the absorption boiler flue gas treatment system of described in any item twin-stages according to claim 1~6, which is characterized in that described Second reactivator connection is equipped with vacuum-pumping tube, and the vacuum-pumping tube is equipped with vacuum pump.

8. the absorption boiler flue gas treatment system of described in any item twin-stages according to claim 1~6, which is characterized in that described Second reactivator connection is equipped with condensate delivery pipe, and the condensate delivery pipe is equipped with the 7th pump housing.

9. the absorption boiler flue gas treatment system of described in any item twin-stages according to claim 1~6, which is characterized in that described The bottom connection of first absorber is equipped with the first sewage pipe, and first sewage pipe is equipped with the first blowdown valve, and described second inhales The bottom connection for receiving device is equipped with the second sewage pipe, and second sewage pipe is equipped with the second blowdown valve.

10. the absorption boiler flue gas treatment system of described in any item twin-stages according to claim 1~6, which is characterized in that described First regenerator is shell-and-tube regenerator, and the Second reactivator is the board-like regenerator of interior heat type.