CN204730177U - Residual heat from boiler fume cascade utilization device - Google Patents
Residual heat from boiler fume cascade utilization device Download PDFInfo
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- CN204730177U CN204730177U CN201520241866.1U CN201520241866U CN204730177U CN 204730177 U CN204730177 U CN 204730177U CN 201520241866 U CN201520241866 U CN 201520241866U CN 204730177 U CN204730177 U CN 204730177U
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- heat exchanger
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- air preheater
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The utility model relates to a kind of residual heat from boiler fume cascade utilization device, comprises flue gas system, air system and closed circle water system.Flue gas system comprises First Heat Exchanger and the air preheater connected successively, the second heat exchanger, deduster, the 3rd heat exchanger and desulfurizer, First Heat Exchanger and air preheater are connected in parallel, air system comprises the preposition air preheater and air preheater that connect successively, closed circle water system comprises closed cycle water pump, and the water inlet of the delivery port of closed cycle water pump, the 3rd heat exchanger, the second heat exchanger, preposition air preheater and closed cycle water pump is in turn connected to form water closed cycle loop.The utility model by after First Heat Exchanger, the second heat exchanger and the 3rd heat exchanger fume afterheat is reclaimed, not only complete three grades of utilizations to fume afterheat, improve the energy conversion efficiency of coal unit, also help and reduce the dust emission concentration of deduster and the water consumption of desulfurizer, improve productivity effect.
Description
Technical field
The utility model relates to boiler afterheat recovery technology field, particularly relates to a kind of residual heat from boiler fume cascade utilization device.
Background technology
Along with expanding economy, society constantly increases the demand of electric power.Power plant about more than 70% is coal fired power plant, and the capacity usage ratio of current coal fired power plant is low, and most waste heat energy is discharged in environment, and in boiler heat loss, power plant's heat loss due to exhaust gas accounts for very large proportion.In the actual motion of boiler, due to the impact of the factors such as heating surface ash dirt, exhaust gas temperature, often higher than design temperature, not only can reduce boiler efficiency, and coa consumption rate is raised; Also can increase the dust emission concentration of deduster, cause environmental pollution; And injection flow rate when also can increase wet desulphurization, cause the significantly waste of water resource.
Utility model content
The purpose of this utility model is to provide a kind of residual heat from boiler fume cascade utilization device, can reduce flue gas discharge temperature, realize the utilization to fume afterheat, improves the energy conversion efficiency of coal unit.
For realizing the purpose of this utility model, the technical scheme taked is:
A kind of residual heat from boiler fume cascade utilization device, comprise flue gas system, air system and closed circle water system, flue gas system comprises First Heat Exchanger, and the air preheater connected successively, second heat exchanger, deduster, 3rd heat exchanger and desulfurizer, First Heat Exchanger and air preheater are connected in parallel, air system comprises the preposition air preheater and air preheater that connect successively, closed-loop water system comprises closed cycle water pump, 3rd heat exchanger, second heat exchanger and preposition air preheater, the delivery port of closed cycle water pump, 3rd heat exchanger, second heat exchanger, the water inlet of preposition air preheater and closed cycle water pump is in turn connected to form closed-up water closed circuit.
Boiler high-temperature flue gas out enters First Heat Exchanger and air preheater, after First Heat Exchanger and air preheater carry out heat exchange cooling to high-temperature flue gas, low-temperature flue gas enters the second heat exchanger, second heat exchanger carries out heat exchange cooling by closed-up water closed circuit one step to flue gas, flue gas enters deduster and carries out dedusting afterwards, flue gas after dedusting enters the 3rd heat exchanger, 3rd heat exchanger carries out heat exchange cooling to flue gas further by water-flow circuit, flue gas enters desulfurizer and carries out desulfurization afterwards, and the flue gas after desulfurization enters in atmospheric environment; The air that boiler combustion needs then is introduced into preposition air preheater with carrying out preheating by closed-up water closed circuit, and then enters air preheater, and under the effect of high-temperature flue gas, air is heated further, finally enters boiler again and burns; The aqueous medium of closed-up water closed circuit by flue gas, is heated the normal temperature air entering preposition air preheater by the aqueous medium heated, fume afterheat is reasonably used after the 3rd heat exchanger and the second heat exchanger.Preheating is carried out to the air entering air preheater, improve the air themperature of air preheater air intlet end, then under ensureing that air themperature that air preheater is discharged meets the prerequisite that boiler combustion requires, the flue gas heat demand of air preheater reduces, and when the high-temperature flue gas of air preheater import is certain, make unnecessary flue gas heat enter First Heat Exchanger, complete and the first order of fume afterheat is utilized; Flue gas is also made to enter deduster again after the second heat exchanger, the flue-gas temperature of ACTIVE CONTROL deduster gas approach, be conducive to the concentration reducing dust emission, and utilize the aqueous medium of flue gas to closed-up water closed circuit entering the second heat exchanger to heat, complete and the second level of fume afterheat is utilized; Flue gas is finally made to enter desulfurizer again after the 3rd heat exchanger, the flue-gas temperature of ACTIVE CONTROL desulfurizer import, reduce the water consumption of desulfurizer, and utilize the aqueous medium of flue gas to closed-up water closed circuit of the 3rd heat exchanger to heat, complete and the third level of fume afterheat is utilized, substantially increase the energy conversion efficiency of coal unit.
Below technical scheme is further illustrated:
Be further, residual heat from boiler fume cascade utilization device also comprises economizer and oxygen-eliminating device, First Heat Exchanger comprises high temperature cigarette water-to-water heat exchanger and low temperature cigarette water-to-water heat exchanger, the water side delivery port of high temperature cigarette water-to-water heat exchanger is connected with the water inlet of economizer, and the water side delivery port of low temperature cigarette water-to-water heat exchanger is connected with the water inlet of oxygen-eliminating device.By high temperature cigarette water-to-water heat exchanger, feedwater is heated, by low temperature cigarette water-to-water heat exchanger, condensate water is heated, improve the energy conversion efficiency of unit, increase productivity effect.
Further, residual heat from boiler fume cascade utilization device also comprises feed-regulating valve and high-pressure heater, is connected in parallel after feed-regulating valve and high-pressure heater series connection with the water side of high temperature cigarette water-to-water heat exchanger.The confluent entering high temperature cigarette water-to-water heat exchanger is controlled by feed-regulating valve, make the feed temperature that the outlet feed temperature of high temperature cigarette water-to-water heat exchanger exports higher than high-pressure heater, improve the feed temperature entering economizer, make the structural design of residual heat from boiler fume cascade utilization device more reasonable.
Further, residual heat from boiler fume cascade utilization device also comprises condensate water control valve and low-pressure heater, is connected in parallel after condensate water control valve and low-pressure heater are connected, with the water side of low temperature cigarette water-to-water heat exchanger.The condensing capacity entering low temperature cigarette water-to-water heat exchanger is controlled by condensate water control valve, make the condensing water temperature that the outlet condensing water temperature of low temperature cigarette water-to-water heat exchanger exports higher than low-pressure heater, improve the condensing water temperature entering oxygen-eliminating device, make the structural design of residual heat from boiler fume cascade utilization device more reasonable.
Further, flue gas system also comprises the first smoke regulating valve, is connected with the first smoke regulating valve between First Heat Exchanger and boiler.Regulated the flue gas heat entering First Heat Exchanger by the first smoke regulating valve, namely have adjusted the flue gas heat entering air preheater simultaneously, make air preheater outlet air temperature meet the combustion requirements of boiler, adjustment simple and flexible.
Further, flue gas system also comprises the second smoke regulating valve, and the second smoke regulating valve and the 3rd heat exchanger are connected in parallel.The flue-gas temperature of desulfurizer gas approach is regulated by the second smoke regulating valve and the 3rd heat exchanger.
Further, flue gas system also comprises air-introduced machine, and the import of air-introduced machine is connected with the outlet of deduster, and the outlet of air-introduced machine is connected with the second smoke regulating valve and the 3rd heat exchanger respectively.Air-introduced machine carries out supercharging to the flue gas entered, and flue gas is delivered to desulfurizer and carries out desulfurization.
Further, closed-up water closed circuit is also connected with expansion tank.In expansion tank buffering closed-up water closed circuit, water is heated the volumetric expansion caused.
Further, closed cycle water pump is variable frequency pump.Variable frequency pump controls the size of discharge in closed-up water closed circuit, regulates the flue-gas temperature of the second heat exchanger and the 3rd heat exchanger exit.
Further, air system also comprises pressure fan, and pressure fan one end is air intake, and the other end is connected with preposition air preheater.By pressure fan, air is delivered in preposition air preheater.
Compared with prior art, the utility model has following beneficial effect:
The utility model is by carrying out preheating to the air entering air preheater, improve the air themperature of air preheater air intlet end, then under ensureing that the air themperature of air preheater outlet meets the prerequisite that boiler combustion requires, the flue gas heat demand of air preheater reduces, and when the high-temperature flue gas of air preheater import is certain, make unnecessary flue gas heat enter First Heat Exchanger, complete and the first order of fume afterheat is utilized; Flue gas is also made to enter deduster again after the second heat exchanger, the flue-gas temperature of ACTIVE CONTROL deduster gas approach, be conducive to the concentration reducing dust emission, and utilize the flue gas entering the second heat exchanger to heat air, complete and the second level of fume afterheat is utilized; Flue gas is finally made to enter desulfurizer again after the 3rd heat exchanger, the flue-gas temperature of ACTIVE CONTROL desulfurizer import, reduce the water consumption of desulfurizer, and utilize the flue gas of the 3rd heat exchanger to heat air, complete and the third level of fume afterheat is utilized, improve the energy conversion efficiency of coal unit.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment residual heat from boiler fume cascade utilization device.
Description of reference numerals:
10. closed cycle water pump, 210. First Heat Exchanger, 211. high temperature cigarette water-to-water heat exchangers, 212. low temperature cigarette water-to-water heat exchangers, 220. second heat exchangers, 230. deduster, 240. the 3rd heat exchangers, 250. desulfurizer, 260. first smoke regulating valves, 270. second smoke regulating valves, 280. air-introduced machine, 310. preposition air preheaters, 320. pressure fan, 50. air preheaters, 610. feed-regulating valve, 620. high-pressure heater, the water inlet of 630. economizers, 640. feed pump, 710. condensate water control valves, 720. low-pressure heater, 730. oxygen-eliminating device, 80. expansion tanks.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail:
As shown in Figure 1, a kind of residual heat from boiler fume cascade utilization device, comprise flue gas system, air system and closed circle water system, flue gas system comprises First Heat Exchanger 210, and the boiler 40 connected successively, air preheater 50, second heat exchanger 220, deduster 230, 3rd heat exchanger 240 and desulfurizer 250, First Heat Exchanger 210 and air preheater 50 are connected in parallel layout, air system comprises the preposition air preheater 310 connected successively, air preheater 50 and boiler 40, closed circle water system comprises closed cycle water pump 10, 3rd heat exchanger 240, second heat exchanger 220 and preposition air preheater 310, the delivery port of closed cycle water pump 10, 3rd heat exchanger 240, second heat exchanger 220, the water inlet of preposition air preheater 310 and closed cycle water pump 10 is in turn connected to form closed-up water closed circuit.
Boiler 40 high-temperature flue gas out enters First Heat Exchanger 210 and air preheater 50, after First Heat Exchanger 210 and air preheater 50 pairs of high-temperature flue gas carry out heat exchange cooling, flue gas enters the second heat exchanger 220, second heat exchanger 220 carries out heat exchange cooling to flue gas further by closed-up water closed circuit, flue gas enters deduster 230 and carries out dedusting afterwards, flue gas after dedusting enters the 3rd heat exchanger 240, 3rd heat exchanger 240 carries out heat exchange cooling to flue gas further by closed-up water closed circuit, flue gas enters desulfurizer 250 and carries out desulfurization afterwards, flue gas after desulfurization enters in atmospheric environment, the air that boiler 40 burns to be needed then is introduced into preposition air preheater 310 and carries out preheating, and then enters air preheater 50, and under the effect of high-temperature flue gas, air is heated further, finally enters boiler 40 again and burns, the aqueous medium of closed-up water closed circuit by flue gas, is heated the normal temperature air entering preposition air preheater 310 by the aqueous medium heated, fume afterheat is reasonably used after the 3rd heat exchanger 240 and the second heat exchanger 220.Preheating is carried out to the air entering air preheater 50, improve the air themperature of air preheater 50 air intlet, then under ensureing that the air themperature of air preheater 50 outlet meets the prerequisite of boiler 40 combustion requirements, the flue gas heat demand of air preheater 50 reduces, and when the high-temperature flue gas of air preheater 50 entrance is certain, make unnecessary flue gas heat enter First Heat Exchanger 210, complete and the first order of fume afterheat is utilized; Flue gas is also made to enter deduster 230 again after the second heat exchanger 220, the flue-gas temperature of ACTIVE CONTROL deduster 230 gas approach, be conducive to the concentration of dust emission, and utilize the flue gas entering the second heat exchanger 220 to heat air, complete and the second level of fume afterheat is utilized; Flue gas is finally made to carry out desulfurizer 250 again after the 3rd heat exchanger 240, the flue-gas temperature of ACTIVE CONTROL desulfurizer 250 import, reduce the water consumption of desulfurizer 250, and utilize the flue gas of the 3rd heat exchanger 240 to heat air, complete and the third level of fume afterheat is utilized, greatly improve the energy conversion efficiency of coal unit.
In the present embodiment, as shown in Figure 1, air system also comprises pressure fan 320, and pressure fan 320 one end is air intake, and the other end is connected with preposition air preheater 310.By pressure fan 320, air is delivered in preposition air preheater 310.And the second heat exchanger 220 and the 3rd heat exchanger 240 are low temperature cigarette water-to-water heat exchanger.
As shown in Figure 1, flue gas system also comprises the first smoke regulating valve 260, is connected with after the first smoke regulating valve 260, first smoke regulating valve 260 is connected with First Heat Exchanger 210 and is arranged in parallel with air preheater 50 between First Heat Exchanger 210 and boiler 40.Regulated the flue gas heat entering First Heat Exchanger 210 by the first smoke regulating valve 260, namely have adjusted the flue gas heat entering air preheater 50, the air themperature that air preheater 50 is exported meets the combustion requirements of boiler 40 simultaneously, adjustment simple and flexible.
As shown in Figure 1, First Heat Exchanger 210 comprises high temperature cigarette water-to-water heat exchanger 211.The water side delivery port of high temperature cigarette water-to-water heat exchanger 211 is connected with the water inlet 630 of economizer, feed-regulating valve 610 and high-pressure heater 620 are arranged in parallel with high temperature cigarette water-to-water heat exchanger 211 after connecting, and the water side water inlet of high temperature cigarette water-to-water heat exchanger 211 also exports female pipe with feed pump 640 and is connected.By high temperature cigarette water-to-water heat exchanger 211, feedwater is heated, and the confluent entering high temperature cigarette water-to-water heat exchanger 211 is controlled by feed-regulating valve 610, make the feed temperature that the outlet feed temperature of high temperature cigarette water-to-water heat exchanger 211 exports higher than high-pressure heater 620, improve the feed temperature entering economizer, make the structural design of residual heat from boiler fume cascade utilization device more reasonable.
As shown in Figure 1, First Heat Exchanger 210 also comprises low temperature cigarette water-to-water heat exchanger 212, the exhanst gas outlet of high temperature cigarette water-to-water heat exchanger 211 is connected with the gas approach of low temperature cigarette water-to-water heat exchanger, residual heat from boiler fume cascade utilization device also comprises condensate water control valve 710 and low-pressure heater 720, the water side delivery port of low temperature cigarette water-to-water heat exchanger 212 is connected with the water inlet of oxygen-eliminating device 730, and condensate water control valve 710 and afterbody low-pressure heater 720 are arranged in parallel with low temperature cigarette water-to-water heat exchanger 212 after connecting.By low temperature cigarette water-to-water heat exchanger 212, the condensate water entering oxygen-eliminating device 730 is heated, and the condensing capacity entering low temperature cigarette water-to-water heat exchanger 212 is controlled by condensate water control valve 710, make the condensing water temperature of outlet condensing water temperature higher than low-pressure heater 720 of low temperature cigarette water-to-water heat exchanger 212, improve the condensing water temperature entering oxygen-eliminating device 730, make the structural design of residual heat from boiler fume cascade utilization device more reasonable.
As shown in Figure 1, flue gas system also comprises the second smoke regulating valve 270, second smoke regulating valve 270 and the 3rd heat exchanger 240 is connected in parallel layout.The flue-gas temperature of desulfurizer 250 import is regulated by the second smoke regulating valve 270 and the 3rd heat exchanger 240.
As shown in Figure 1, flue gas system also comprises air-introduced machine 280, and the import of air-introduced machine 280 is connected with the outlet of deduster 230, and the outlet of air-introduced machine 280 is connected with the second smoke regulating valve 270 and the 3rd heat exchanger 240 respectively.Air-introduced machine 280 carries out supercharging to the flue gas entered, and flue gas is delivered to desulfurizer 250 and carries out desulfurization.
As shown in Figure 1, closed-up water closed circuit is also connected with expansion tank 80.Expansion tank 80 cushions water in closed-up water closed circuit and to be heated the volumetric expansion caused.
In the present embodiment, closed cycle water pump 10 is variable frequency pump.Variable frequency pump controls the size of discharge in closed-up water closed circuit, regulates the flue-gas temperature of the second heat exchanger 220 and the outlet of the 3rd heat exchanger 240.Closed cycle water pump 10 can also be set to other forms of water pump according to actual needs.
Flue-gas temperature is reduced to suitable temperature in boiler tail parallel connection and the multiple heating surface of series connection by the utility model, the high-temperature flue gas heat wherein obtained from fume afterheat one-level utilizes is heated feedwater by high temperature cigarette water-to-water heat exchanger 211, in obtaining from fume afterheat secondary utilizes, warm flue gas heat is heated by low temperature cigarette water-to-water heat exchanger 212 pairs of condensate water, the low-temperature flue gas heat obtained from fume afterheat three grades utilizes is heated by the second heat exchanger 220 and the 3rd heat exchanger 240 pairs of air, complete three grades of utilizations to fume afterheat, improve the energy conversion efficiency of coal unit.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this description is recorded.
The above embodiment only have expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (10)
1. a residual heat from boiler fume cascade utilization device, it is characterized in that, comprise flue gas system, air system and closed circle water system, described flue gas system comprises First Heat Exchanger, and the air preheater connected successively, second heat exchanger, deduster, 3rd heat exchanger and desulfurizer, described First Heat Exchanger and described air preheater are connected in parallel, described air system comprises the preposition air preheater and described air preheater that connect successively, described closed circle water system comprises closed cycle water pump, described 3rd heat exchanger, described second heat exchanger and described preposition air preheater, the delivery port of described closed cycle water pump, described 3rd heat exchanger, described second heat exchanger, the water inlet of described preposition air preheater and described closed cycle water pump is in turn connected to form closed-up water closed circuit.
2. residual heat from boiler fume cascade utilization device according to claim 1, it is characterized in that, also comprise economizer and oxygen-eliminating device, described First Heat Exchanger comprises high temperature cigarette water-to-water heat exchanger and low temperature cigarette water-to-water heat exchanger, the water side delivery port of described high temperature cigarette water-to-water heat exchanger is connected with the water inlet of described economizer, and the water side delivery port of described low temperature cigarette water-to-water heat exchanger is connected with the water inlet of described oxygen-eliminating device.
3. residual heat from boiler fume cascade utilization device according to claim 2, it is characterized in that, also comprise feed-regulating valve and high-pressure heater, be connected in parallel after described feed-regulating valve and described high-pressure heater are connected, with the water side of described high temperature cigarette water-to-water heat exchanger.
4. residual heat from boiler fume cascade utilization device according to claim 2, it is characterized in that, also comprise condensate water control valve and low-pressure heater, be connected in parallel after described condensate water control valve and described low-pressure heater are connected, with the water side of described low temperature cigarette water-to-water heat exchanger.
5. residual heat from boiler fume cascade utilization device according to claim 1, is characterized in that, described flue gas system also comprises the first smoke regulating valve, and described first smoke regulating valve is connected between described First Heat Exchanger and described boiler.
6. residual heat from boiler fume cascade utilization device according to claim 1, is characterized in that, flue gas system also comprises the second smoke regulating valve, and described second smoke regulating valve and described 3rd heat exchanger are connected in parallel.
7. residual heat from boiler fume cascade utilization device according to claim 6, it is characterized in that, described flue gas system also comprises air-introduced machine, the import of described air-introduced machine is connected with the outlet of described deduster, and the outlet of described air-introduced machine is connected with described second smoke regulating valve and described 3rd heat exchanger respectively.
8. residual heat from boiler fume cascade utilization device according to claim 1, is characterized in that, described closed-up water closed circuit is also connected with expansion tank.
9. residual heat from boiler fume cascade utilization device according to claim 1, is characterized in that, described closed cycle water pump is variable frequency pump.
10. the residual heat from boiler fume cascade utilization device according to any one of claim 1 to 9, it is characterized in that, described air system also comprises pressure fan, and described pressure fan one end is provided with air intake, and the other end is connected with the air intlet of described preposition air preheater.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520241866.1U CN204730177U (en) | 2015-04-20 | 2015-04-20 | Residual heat from boiler fume cascade utilization device |
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| CN201520241866.1U CN204730177U (en) | 2015-04-20 | 2015-04-20 | Residual heat from boiler fume cascade utilization device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104791761A (en) * | 2015-04-20 | 2015-07-22 | 广州粤能电力科技开发有限公司 | Step utilization device for boiler flue gas waste heat |
| CN105371291A (en) * | 2015-11-09 | 2016-03-02 | 华电电力科学研究院 | System capable of utilizing smoke waste heat in gradient mode for assisting in removing SO3 and improving dust removing efficiency |
-
2015
- 2015-04-20 CN CN201520241866.1U patent/CN204730177U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104791761A (en) * | 2015-04-20 | 2015-07-22 | 广州粤能电力科技开发有限公司 | Step utilization device for boiler flue gas waste heat |
| CN105371291A (en) * | 2015-11-09 | 2016-03-02 | 华电电力科学研究院 | System capable of utilizing smoke waste heat in gradient mode for assisting in removing SO3 and improving dust removing efficiency |
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