CN202274502U - System for heating purified flue gas exhausted after desulfurization by extracting steam with boiler unit - Google Patents
System for heating purified flue gas exhausted after desulfurization by extracting steam with boiler unit Download PDFInfo
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- CN202274502U CN202274502U CN2011203753067U CN201120375306U CN202274502U CN 202274502 U CN202274502 U CN 202274502U CN 2011203753067 U CN2011203753067 U CN 2011203753067U CN 201120375306 U CN201120375306 U CN 201120375306U CN 202274502 U CN202274502 U CN 202274502U
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Abstract
The utility model discloses a system for heating purified flue gas exhausted after desulfurization by extracting steam with a boiler unit. The system comprises a boiler flue, a condensate pipeline and a unit steam extraction pipeline, wherein a desulfurizing absorption tower is arranged in the boiler flue; a purified flue gas heater is arranged in the boiler flue behind the desulfurizing absorption tower; a flue gas residual heat absorbing device is arranged in the boiler flue in front of the desulfurizing absorption tower; the condensate pipeline is partitioned into two paths: a first condensate branch is directly connected with a low-pressure heater, and a second condensate branch is connected with the low-pressure heater after passing through a steam desuperheater and the flue gas residual heat absorbing device; and a unit steam extraction pipeline is connected with the low-pressure heater, and is connected with the purified flue gas heater after passing through the steam desuperheater. In the system, purified flue gas exhausted after wet desulfurization is heated by extracting steam with the boiler unit, and thermal compensation is performed by absorbing flue gas residual heat, so that thermal balance of the boiler unit is ensured, and acid dew corrosion of each piece of equipment is avoided.
Description
Technical field
The utility model relates to that clean flue gas heats the field again after the wet desulphurization, particularly a kind of system that utilizes the boiler unit to draw gas to add clean flue gas behind the thermally desulfurizing.
Background technology
Contain sulfur dioxide in the flue gas of boiler, directly discharging can form acid rain, causes serious environmental to pollute; Especially the sulfur dioxide improvement work of thermal power plant has caused extensive concern, and present domestic power plant all adopts efficient apparatus to carry out sulfur dioxide at present and administers.At present, it is smoke-gas wet desulfurization that power plant uses maximum, and it is to adopt lime stone (or lime)-gypsum wet sulfur removal technology that wet flue gas desulfurizer is used maximum at present.Make absorbent washing sulfur in smoke with lime stone (or lime) and generate calcium sulfite, carry out oxidation reaction with the air that adds again and generate gypsum at last, remove sulfur dioxide, flue.Entire reaction course is all accomplished in desulfuration absorbing tower, and reaction temperature is generally about 50 ℃.
Be low temperature wet flue gas corrosion flue and the inner wall of stack of avoiding desulfuration absorbing tower to discharge; Improve chimney simultaneously and discharge the diffusion that the rising height of flue gas is beneficial to pollutant; Avoid smoke evacuation landing drop, standing gas-to-gas heat exchanger (being called for short GGH) device, gas-to-gas heat exchanger is generally two; One be arranged on desulfuration absorbing tower before, one be arranged on desulfuration absorbing tower after.The concrete effect of gas-to-gas heat exchanger is: the one, reduce the flue-gas temperature that gets into desulfuration absorbing tower, and satisfy the requirement of sulfur removal technology; The 2nd, utilize the flue gas heat that absorbs to heat the clean flue gas at desulfuration absorbing tower rear; Improve exhaust gas temperature (the general requirement is not less than 80 ℃); Alleviate flue and chimney and suffer the corrosion of low temperature wet flue gas; Make the flue gas of chimney breast that enough rising heights are arranged simultaneously, thereby improve the environmental quality of ambient atmosphere.
Yet as containing sulfur dioxide in the aforesaid flue gas; Water vapour in it and the flue gas can form sulfuric acid when flue-gas temperature is lower than a certain temperature; No matter therefore the meeting etching apparatus be the cooling heat exchanger of desulfuration absorbing tower upstream side or the heater in downstream, all exists acid to reveal the problem of corrosion.And after GGH is installed,, increase the maintenance cost of GGH because the obstruction of the corrosion of GGH parts and heat exchange element can reduce the availability of wet desulfurization system.
For improving the efficient of whole boiler unit, be provided with multistage heater on the general supply line before advancing economizer in the power plant of boiler or power plant for self-supply of the large and medium-sized enterprise therrmodynamic system, the heating boiler feedwater, higher because of the feed pressure of heating, be referred to as high-pressure heater; For some large medium-size boiler units, advancing on the preceding condensate line of oxygen-eliminating device (also being a heater) itself also to be provided with multistage heater, heat-setting water, for the pressure of feedwater, the pressure of condensate is lower, is referred to as low-pressure heater.Comprise that their used thermals source of oxygen-eliminating device and high and low pressure heater are drawing gas of boiler unit, according to the difference of each unit, the steam parameter that draws gas also is not quite similar, and in general is superheated steam.At present, boiler unit extraction line is mainly used in the thermal cycle of boiler self.
The utility model content
The utility model technical problem to be solved provides a kind of system that utilizes the boiler unit to draw gas to add clean flue gas behind the thermally desulfurizing, overcomes the problems referred to above that exist in the prior art.
The utility model is a kind of to utilize the boiler unit to draw gas to add the system of clean flue gas behind the thermally desulfurizing; Comprise boiler flue, condensing water conduit and unit extraction line; Be provided with desulfuration absorbing tower in the said boiler flue; In the boiler flue at said desulfuration absorbing tower rear, be provided with clean flue gas heater, in the boiler flue in desulfuration absorbing tower the place ahead, be provided with the fume afterheat absorption plant; Said condensing water conduit is divided into two-way: the first condensed water branch road directly is connected with low-pressure heater; The second condensed water branch road is connected with low-pressure heater behind steam attemperator and fume afterheat absorption plant; The unit extraction line is connected with said low-pressure heater, and the unit extraction line is also through being connected with said clean flue gas heater behind the steam attemperator.
The utility model also comprises the control system, and said fume afterheat absorption plant is provided with temperature sensor, also is provided with water regulating valve on the said second condensed water branch road, and temperature sensor all links to each other with the control system with water regulating valve.
The utility model is through also being provided with steam control valve on the bleed steam pipework of said steam attemperator, and steam control valve links to each other with said control system.
The said fume afterheat absorption plant of the utility model is indirect type heat exchanger or direct-type heat exchanger.
The utility model also is provided with low corrosion flue gas heat exchange device in the boiler flue in said desulfuration absorbing tower the place ahead; Low corrosion flue gas heat exchange device comprises the absorber portion heat release section outer with being located at boiler flue that is located in the boiler flue; Absorber portion links to each other through circulating line with heat release section; Be provided with cycle fluid in the circulating line; The flow through heat release section of fume afterheat absorption plant of the said second condensed water branch road, the second condensed water branch road is successively through getting into low-pressure heater behind said steam attemperator, low corrosion flue gas heat exchange device heat release section and the fume afterheat absorption plant.
The utility model also is provided with low corrosion flue gas heat exchange device in the boiler flue in said desulfuration absorbing tower the place ahead; Low corrosion flue gas heat exchange device comprises the absorber portion heat release section outer with being located at boiler flue that is located in the boiler flue; Absorber portion links to each other through circulating line with heat release section; Be provided with cycle fluid in the circulating line, the flow through heat release section of fume afterheat absorption plant of the said second condensed water branch road, the second condensed water branch road is divided into two-way through behind the said steam attemperator; One the tunnel gets into low-pressure heater through heat release section, and one the tunnel gets into low-pressure heater behind the low corrosion of fume afterheat absorption plant flue gas heat exchange device.
Cycle fluid in the said circulating line of the utility model is the steam of forced circulation water, conduction oil or Natural Circulation.
The said low-pressure heater of the utility model comprises first low-pressure heater and second low-pressure heater, and the first condensed water branch road is connected with second low-pressure heater behind first low-pressure heater; The second condensed water branch road is connected with second low-pressure heater behind steam attemperator and fume afterheat absorption plant.
Be provided with chimney in the boiler flue at the said clean flue gas heater of the utility model rear.
The utility model also is provided with deduster in the boiler flue in said desulfuration absorbing tower the place ahead.
Through above technical scheme; The utility model utilizes the boiler unit to draw gas to add the system of clean flue gas behind the thermally desulfurizing; Utilize drawing gas of boiler unit to heat the clean flue gas of discharging after the wet desulphurization; And carry out the thermodynamic equilibrium that thermal compensation guarantees boiler unit self through absorbing fume afterheat; Direct fume afterheat that absorbs with flue gas heat exchange device endotherm section that it is different from traditional GGH is passed to the clean flue gas after clean flue gas heater heats wet desulphurization, has solved the etching problem of original GGH system, has improved the unstability of traditional GGH system.
Description of drawings
Fig. 1 is the first embodiment concrete structure figure of the utility model.
Fig. 2 is the second embodiment concrete structure figure of the utility model.
Fig. 3 is the 3rd embodiment concrete structure figure of the utility model.
Among the figure, 1-fume afterheat absorption plant; The 2-deduster; The 3-desulfuration absorbing tower; The clean flue gas heater of 4-; The 5-air-introduced machine;
The 6-chimney; 7-steam attemperator; The 8-steam control valve; 9-first low-pressure heater; 10-second low-pressure heater;
The 11-water regulating valve; 12-controls system; The 13-temperature sensor; The 14-endotherm section; The 15-heat release section.
The specific embodiment
As shown in Figure 1; The utility model is a kind of to utilize the boiler unit to draw gas to add first embodiment of clean flue gas system behind the thermally desulfurizing; Comprise boiler flue, condensing water conduit and unit extraction line; Be provided with desulfuration absorbing tower 3 in the boiler flue, in the boiler flue at desulfuration absorbing tower rear, be provided with clean flue gas heater 4, in the boiler flue in desulfuration absorbing tower the place ahead, be provided with fume afterheat absorption plant 1; Condensing water conduit is divided into two-way: the first condensed water branch road directly is connected with low-pressure heater; The second condensed water branch road is connected with low-pressure heater behind steam attemperator 7 and fume afterheat absorption plant 1; The unit extraction line is connected with low-pressure heater, and the unit extraction line also is connected with clean flue gas heater 4 through steam attemperator 7 backs.The utility model utilizes the clean flue gas after drawing gas of boiler unit adds thermally desulfurizing, prevents each equipment of the excessively low and sour dew corrosion of cigarette temperature; Utilize the fume afterheat absorption plant to come the heating boiler feedwater simultaneously, guarantee the thermodynamic equilibrium of boiler unit self.
Also comprise control system 12; Fume afterheat absorption plant 1 is provided with temperature sensor 13; On the second condensed water branch road, be provided with water regulating valve 11; Bleed steam pipework through the steam attemperator is provided with steam control valve 8, and temperature sensor 13, water regulating valve 11 and steam control valve 8 all link to each other with control system 12.This control system measures the wall temperature of fume afterheat absorption plant in real time; And through steam control valve 8 regulate the heating clean flue gas quantity of steam; Regulate the water yield of condensed water through water regulating valve 11, prevent that the fume afterheat absorption plant receives acid to reveal corrosion through the fume afterheat absorption plant.
Above-mentioned low-pressure heater comprises that first low-pressure heater 9 and second low-pressure heater, 10, the first condensed water branch roads are connected with second low-pressure heater 10 behind first low-pressure heater 9; The second condensed water branch road is connected with second low-pressure heater 10 behind steam attemperator 7 and fume afterheat absorption plant 1.
The operation principle of the utility model is following:
In the boiler flue in desulfurizing tower the place ahead, be provided with deduster 2; And deduster 2 is between fume afterheat absorption plant 1 and desulfurizing tower 3; And in the boiler flue at clean flue gas heater rear, be provided with chimney 6; Flue gas from boiler flue is flowed through and is in proper order: fume afterheat absorption plant 1, deduster 2, air-introduced machine 5, desulfuration absorbing tower 3, clean flue gas heater 4, go chimney 6 to drain at last.Draw gas in the boiler unit extraction line to flow to and be: go drawing gas of second low-pressure heater 10; Go drawing gas of first low-pressure heater 9, go the part of drawing gas of first low-pressure heater 9 can pass through steam control valve 8, steam attemperator 7, remove clean flue gas heater 4 at last, in clean flue gas heater 4, become to be condensed into water and discharge; Also can from boiler unit extraction line, directly tell a part draw gas devaporation control valve 8, steam attemperator 7, remove the clean flue gas of clean flue gas heater 4 heating at last.
Go the part of first low-pressure heater 9 to draw gas and pass through steam control valve 8, steam attemperator 7 successively, get into clean flue gas heater 4 again, its objective is the degree of superheat that reduces steam earlier, make that the steam that gets into clean flue gas heater 4 is saturated vapor as far as possible; So not only improve the heat transfer efficiency of clean flue gas heater; Importantly the heat exchange mode of clean flue gas heater is an in-tube condensation---manage outer flue gas convection current; Make the wall surface temperature of clean flue gas heater near in-tube condensation side (in-tube condensation exothermic coefficient far above pipe outer flue gas convective heat-transfer coefficient), avoided the acid dew etching problem of clean flue gas heater.
The utility model draws gas a part of removing first low-pressure heater 9 in order to the clean flue gas after the heating wet desulphurization, must cause the heat output of first low-pressure heater 9 to reduce; For guaranteeing the therrmodynamic system balance of boiler unit, the utility model carries out thermal compensation through fume afterheat absorption plant 1, the thermal loss that draws gas of the clean flue gas of outlet after the compensation heating wet desulphurization.
General 130 ℃ of the exhaust gas temperature of domestic station boiler; The acid dew point of flue gas is about 80 ℃; Our desirable 85 ℃ of wall surface temperatures are avoided acid and are revealed corrosion like this, consider certain heat transfer temperature difference; Exhaust gas temperature through behind the fume afterheat absorption plant is about 100 ℃, has reclaimed the waste heat of 30 ℃ of flue gas temperature difference; And the temperature that the clean flue gas heater in back heats clean flue gas is for from 50 ℃ to 80 ℃ (Europe, relevant criterion are for being not less than 75 ℃), and the heat that flue gas reclaims satisfies the heat of clean flue gas heating needs, so has guaranteed the thermodynamic equilibrium of whole unit.
Above-mentioned fume afterheat absorption plant 1 is indirect type heat exchanger or direct-type heat exchanger.
As shown in Figure 2; The utility model is a kind of to utilize the boiler unit to draw gas to add second specific embodiment of clean flue gas system behind the thermally desulfurizing; Except that structure same as the previously described embodiments; When the acid dew point of flue gas was higher than 80 ℃ or exhaust gas temperature and is lower than 130 ℃, this moment was if will guarantee flue gas waste heat recovery apparatus avoids acid and reveal corrosion, and the required heat of clean flue gas heating is constant; At this moment the utility model is provided with low corrosion flue gas heat exchange device in the boiler flue in desulfurizing tower the place ahead, and flue gas waste heat recovery apparatus 1 is selected the heat exchanger of economizer form at this moment.Low corrosion flue gas heat exchange device can further reduce flue-gas temperature, and the heat that reclaims is used to heat the water inlet that gets into condensing water conduit, guarantees the thermodynamic equilibrium of whole unit.
The low corrosion of the utility model heat exchanger comprises absorber portion 14 heat release section 15 outer with being located at boiler flue that is located in the boiler flue, and absorber portion 14 links to each other with heat release section 15 through circulating line, is provided with cycle fluid in the circulating line; Condensing water conduit is divided into two-way: the first condensed water branch road is connected with second low-pressure heater 10 behind first low-pressure heater 9; The second condensed water branch road is connected with second low-pressure heater 10 behind steam attemperator 7, heat release section 13 and fume afterheat absorption plant 1; The unit extraction line is connected with first low-pressure heater 9, second low-pressure heater 10 respectively, and the unit extraction line also is connected with flue gas heaters 4 only through steam attemperator 7 backs.
Be provided with cycle fluid in absorber portion 14 and the circulating line that heat release section 15 links to each other; This cycle fluid can be the steam of Natural Circulation; Also can be forced circulation water or conduction oil; When for forced circulation water or conduction oil, on circulating line, be provided with circulating pump, as the power of forced circulation water or conduction oil.
The exhaust gas temperature of boiler is 130 ℃～160 ℃; The boiler feed temperature of heating is generally between 20 ℃～60 ℃, if flue gas is direct and its heat exchange, the heat exchanger wall surface temperature is near the flue gas acid dew point temperature; Possibly cause the acid of heat transmission equipment to reveal corrosion; For avoiding this problem, the low corrosion of the utility model heat exchanger adopts absorber portion 14 and 15 two parts of heat release section, and (or behind deduster) boiler flue absorption flue gas heat passed to circulatory mediator before absorber portion 14 placed deduster; Circulatory mediator passes to boiler feedwater or condensed water in heat release section again; The circulatory mediator working mechanism is generally high temperature forced circulation water, conduction oil or Natural Circulation steam, so its heat transfer coefficient makes wall surface temperature determined by working media side temperature far above fume side; Its control system can make it be higher than the flue gas acid dew point temperature all the time with the change regulated at will wall temperature of boiler load, at utmost reclaims smoke discharging residual heat.
As shown in Figure 3; The 3rd embodiment concrete structure figure of the utility model; Similar its difference with second example structure is: the heat release section 15 that will hang down corrosion flue gas heat exchange device is connected in parallel on the second condensed water branch road with fume afterheat absorption plant 1; Promptly be divided into two-way behind the second condensed water branch road process steam attemperator 7, the one tunnel gets into second low-pressure heater 10, a tunnel through heat release section 15 gets into second low-pressure heater 10 behind fume afterheat absorption plant 1.
Claims (10)
1. a system that utilizes the boiler unit to draw gas to add clean flue gas behind the thermally desulfurizing comprises boiler flue, condensing water conduit and unit extraction line, is provided with desulfuration absorbing tower (3) in the said boiler flue, it is characterized in that,
In the boiler flue at said desulfuration absorbing tower rear, be provided with clean flue gas heater (4), in the boiler flue in desulfuration absorbing tower the place ahead, be provided with fume afterheat absorption plant (1);
Said condensing water conduit is divided into two-way: the first condensed water branch road directly is connected with low-pressure heater; The second condensed water branch road is connected with low-pressure heater behind steam attemperator (7) and fume afterheat absorption plant (1);
The unit extraction line is connected with said low-pressure heater, and the unit extraction line also passes through steam attemperator (7) back and is connected with said clean flue gas heater (4).
2. according to the said system that utilizes the boiler unit to draw gas to add clean flue gas behind the thermally desulfurizing of claim 1; It is characterized in that; Also comprise control system (12); Said fume afterheat absorption plant is provided with temperature sensor (13), also is provided with water regulating valve (11) on the second condensed water branch road, and temperature sensor (13) all links to each other with control system (12) with water regulating valve (11).
3. according to the said system that utilizes the boiler unit to draw gas to add clean flue gas behind the thermally desulfurizing of claim 2, it is characterized in that be provided with steam control valve (8) through the extraction line of said steam attemperator, steam control valve (8) links to each other with said control system (12).
4. according to the said system that utilizes the boiler unit to draw gas to add clean flue gas behind the thermally desulfurizing of claim 1, it is characterized in that said fume afterheat absorption plant is indirect type heat exchanger or direct-type heat exchanger.
5. according to the said system that utilizes the boiler unit to draw gas to add clean flue gas behind the thermally desulfurizing of claim 1; It is characterized in that; In the boiler flue in said desulfuration absorbing tower (3) the place ahead, also be provided with low corrosion flue gas heat exchange device; Low corrosion flue gas heat exchange device comprises the absorber portion (14) that is located in the boiler flue and is located at boiler flue heat release section (15) outward; Absorber portion (14) links to each other through circulating line with heat release section (15), is provided with cycle fluid in the circulating line, and the second condensed water branch road passes through said steam attemperator (7), heat release section (15) and fume afterheat absorption plant (1) back successively and gets into low-pressure heater.
6. according to the said system that utilizes the boiler unit to draw gas to add clean flue gas behind the thermally desulfurizing of claim 1; It is characterized in that; In the boiler flue in said desulfuration absorbing tower (3) the place ahead, also be provided with low corrosion flue gas heat exchange device, low corrosion flue gas heat exchange device comprises absorber portion (14) that is located in the boiler flue and the heat release section (15) that is located at outside the boiler flue, and absorber portion (14) links to each other through circulating line with heat release section (15); Be provided with cycle fluid in the circulating line; Be divided into two-way behind the second condensed water branch road said steam attemperator of process (7), the one tunnel through heat release section (15) entering low-pressure heater, and one the tunnel gets into low-pressure heater behind fume afterheat absorption plant (1).
7. according to claim 5 or the 6 said systems that utilize the boiler unit to draw gas to add clean flue gas behind the thermally desulfurizing, it is characterized in that the cycle fluid in the said circulating line is the steam of forced circulation water, conduction oil or Natural Circulation.
8. according to the said system that utilizes the boiler unit to draw gas to add clean flue gas behind the thermally desulfurizing of claim 1; It is characterized in that; Said low-pressure heater comprises first low-pressure heater (9) and second low-pressure heater (10), and the first condensed water branch road is connected with second low-pressure heater (10) behind first low-pressure heater (9); The second condensed water branch road is connected with second low-pressure heater (10) behind steam attemperator (7) and fume afterheat absorption plant (1).
9. according to the said system that utilizes the boiler unit to draw gas to add clean flue gas behind the thermally desulfurizing of claim 1, it is characterized in that, be provided with chimney (6) in the boiler flue at said clean flue gas heater (4) rear.
10. according to the said system that utilizes the boiler unit to draw gas to add clean flue gas behind the thermally desulfurizing of claim 1, it is characterized in that, in the boiler flue in said desulfuration absorbing tower the place ahead, also be provided with deduster (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203753067U CN202274502U (en) | 2011-09-30 | 2011-09-30 | System for heating purified flue gas exhausted after desulfurization by extracting steam with boiler unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203753067U CN202274502U (en) | 2011-09-30 | 2011-09-30 | System for heating purified flue gas exhausted after desulfurization by extracting steam with boiler unit |
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| Publication Number | Publication Date |
|---|---|
| CN202274502U true CN202274502U (en) | 2012-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203753067U Withdrawn - After Issue CN202274502U (en) | 2011-09-30 | 2011-09-30 | System for heating purified flue gas exhausted after desulfurization by extracting steam with boiler unit |
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| CN (1) | CN202274502U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032881A (en) * | 2011-09-30 | 2013-04-10 | 上海伏波环保设备有限公司 | System using extraction steam of boiler unit to heat clean smoke after desulfurization |
| WO2014048089A1 (en) * | 2012-09-26 | 2014-04-03 | 上海伏波环保设备有限公司 | Natural circulation indirect type flue gas reheater |
-
2011
- 2011-09-30 CN CN2011203753067U patent/CN202274502U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032881A (en) * | 2011-09-30 | 2013-04-10 | 上海伏波环保设备有限公司 | System using extraction steam of boiler unit to heat clean smoke after desulfurization |
| CN103032881B (en) * | 2011-09-30 | 2015-04-01 | 上海伏波环保设备有限公司 | System using extraction steam of boiler unit to heat clean smoke after desulfurization |
| WO2014048089A1 (en) * | 2012-09-26 | 2014-04-03 | 上海伏波环保设备有限公司 | Natural circulation indirect type flue gas reheater |
| KR20150052300A (en) | 2012-09-26 | 2015-05-13 | 상하이 푸보 이피 이큅프먼트 컴퍼니 리미티드 | Natural circulation indirect type flue gas reheater |
| KR101668969B1 (en) | 2012-09-26 | 2016-10-28 | 상하이 푸보 이피 이큅프먼트 컴퍼니 리미티드 | Natural circulation indirect type flue gas reheater |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120613 Effective date of abandoning: 20150401 |
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| RGAV | Abandon patent right to avoid regrant |