CN207462994U - A kind of flue gas therrmodynamic system suitable for low temperature SCR denitration - Google Patents
A kind of flue gas therrmodynamic system suitable for low temperature SCR denitration Download PDFInfo
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- CN207462994U CN207462994U CN201721421106.4U CN201721421106U CN207462994U CN 207462994 U CN207462994 U CN 207462994U CN 201721421106 U CN201721421106 U CN 201721421106U CN 207462994 U CN207462994 U CN 207462994U
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- flue gas
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Abstract
The utility model discloses a kind of flue gas therrmodynamic systems suitable for low temperature SCR denitration, belong to boiler manfacturing and transformation field, flue gas heater is arranged on low temperature SCR denitration device portal flue, gas cooler B is arranged on low temperature SCR denitration device exhaust pass, the heat medium water that the heating agent water end (W.E.) of heat medium water reheater is connected to gas cooler B is exported on the heating agent waterpipe between the heating agent water inlet of flue gas heater, the heat medium water that the heating agent water end (W.E.) of heat medium water heat reclaim unit is connected to flue gas heater is exported on the heating agent waterpipe between the heating agent water inlet of gas cooler B.Preferably to meet the needs of low temperature SCR denitration catalyst is for flue-gas temperature, system economy is improved, this patent proposes a kind of flue gas therrmodynamic system for being applicable to low-temperature denitration catalyst, is mainly used for the desulphurization denitration processing of various industrial smokes.
Description
Technical field
The utility model belongs to boiler manfacturing and transformation field more particularly to flue gas heat recovery.
Background technology
Current most of coal fired thermal power plant tail flue gas use following flow：Boiler back end ductwork → SCR denitration device →
Air preheater → deduster → air-introduced machine → desulfurizer → chimney.As country is to various industrial smoke pollutant emissions
It is required that more and more stringenter, original environmental protection equipment has been difficult to meet the corresponding emission request of country.Due to the difference of technological process
Not, original ripe processing for being suitable for Rear of Utility Boiler flue gas flow and not applying to other industrial smokes usually.
For these reasons, a kind of low temperature SCR denitration catalyst suitable for industrial smoke flow comes into being, this low
The preference temperature section of warm SCR denitration is 200~230 DEG C, preferably to meet low temperature SCR denitration catalyst for cigarette
The demand of temperature degree, improves system economy, and the prior art needs a kind of flue gas heating power for being applicable to low-temperature denitration catalyst
System.
Utility model content
The purpose of this utility model is that：It is proposed a kind of flue gas therrmodynamic system for being applicable to low-temperature denitration catalyst, it can
Meet requirement of the tail flue gas processing environmental protection equipment to flue-gas temperature；The waste heat contained in recyclable each section of flue gas of commercial plant,
Improve the economy of entire commercial plant；The flue-gas temperature that this flue gas therrmodynamic system enters chimney can be controlled in 80 DEG C or more, can
Chimney is effectively prevent to emit the generation of white cigarette phenomenon.
The utility model aim is realized by following technical proposals：
A kind of flue gas therrmodynamic system suitable for low temperature SCR denitration including low temperature SCR denitration device, further includes composition and closes
The flue gas heater of the heating agent water circulation system of formula, gas cooler B, booster, expansion tank, heat medium water reheater and
Heat medium water heat reclaim unit, flue gas heater are arranged on low temperature SCR denitration device portal flue, gas cooler B arrangements
On low temperature SCR denitration device exhaust pass, the heating agent water end (W.E.) of heat medium water reheater is connected to the heating agent of gas cooler B
On water out to the heating agent waterpipe between the heating agent water inlet of flue gas heater, the heating agent water end (W.E.) of heat medium water heat reclaim unit
The heat medium water for being connected to flue gas heater is exported on the heating agent waterpipe between the heating agent water inlet of gas cooler B, heating agent
The heat of water heat reclaim unit recycling is provided with regulating valve for heating low-temperature receiver medium on the pipeline of low-temperature receiver medium inlet..
Alternatively, the heat medium water of flue gas heater is additionally provided with heat between being exported to the heating agent water inlet of gas cooler B
Matchmaker's water adjusts bypass, and heat medium water adjusts bypass and the heating agent water end (W.E.) of heat medium water heat reclaim unit is arranged in parallel.
As further selection, heat medium water adjusts bypass and the parallel pipeline of the heating agent water end (W.E.) of heat medium water heat reclaim unit
On be respectively equipped with regulating valve.
Alternatively, it is additionally provided with heat medium water medicine system in heating agent water circulation system.
Alternatively, expansion tank is equipped with safety valve and water supply pipe and its regulating valve.
Alternatively, gas cooler A is further included, gas cooler A is arranged in commercial plant and is exported between desulfurizing tower
Flue on, the heat of off-gas recovery is provided with regulating valve for heating low-temperature receiver medium on the pipeline of low-temperature receiver medium inlet..
As further selection, gas cooler A is arranged in before or after deduster.
As another further selection, low-temperature receiver medium is blown for low-pressure heater system condensation water or boiler.
Alternatively, heat medium water reheater reheats heat medium water using external heat source.
As further selection, external heat source is auxiliary steam, electrical heating or gas heating.
The aforementioned main scheme of the utility model and its each further selection scheme can be freely combined to form multiple schemes,
The scheme that can be used and be claimed for the utility model；And the utility model, (each non conflicting selection) selection between and and
It can also be freely combined between other selections.Those skilled in the art after the utility model is understood according to the prior art and
Common knowledge can be understood there are many combining, and be the claimed technical solution of the utility model, do not done exhaustion herein.
Each device of the utility model is act as：
Flue gas heater：It is arranged on low temperature SCR denitration device portal flue, for heating the exiting flue gas of desulfurizing tower,
By flue gas to the temperature in use of low temperature SCR denitration device low temperature catalyst.
Gas cooler A：May be arranged at before or after deduster, for recycle commercial plant outlet flue gas more than
Heat, while using the efficiency of low temperature dedusting technology raising deduster, can also reduce the water consume of desulfurization.
Gas cooler B：It is arranged on low temperature SCR denitration device exhaust pass, it is net after low-temperature denitration for recycling
The flue gas heat of flue gas.
Heat medium water reheater：It is arranged on gas cooler B to the heating agent waterpipe between expansion tank, can be used
A variety of external heat sources reheat heat medium water, such as auxiliary steam, electrical heating, gas heating, reheat and fill through heat medium water
Put the heat medium water after heating and be unlikely to that temperature is excessively high and vaporize, and guarantee it is heated after high temperature heat medium water can be by low-temperature SCR
The flue gas of denitrification apparatus entrance is to the required flue-gas temperature of low temperature catalyst.
Heat medium water heat reclaim unit：Heat medium water heat reclaim unit one end connects heating agent water end (W.E.), this end is arranged in flue gas
On heater to the heating agent waterpipe between gas cooler B, the other end can connect low-pressure heater system condensation water, boiler is sent
The low-temperature receivers medium such as wind is provided with regulating valve on cold medium inlet duct.
Expansion tank system：For the moisturizing and voltage stabilizing of heating agent water system, regulating valve is provided with, while swollen in moisturizing pipeline
Swollen water tank can absorb the swell increment of heat medium water, and expansion tank is connected on heating agent waterpipe, and the channel as heat medium water is with system
Operation, expansion tank top are provided with safety valve.
Middle pressure heating agent water-system pipeline：Main connection heat medium water booster, gas cooler B, heat medium water reheater,
Expansion tank, flue gas heater, heat medium water heat reclaim unit etc., heating agent water system uses closed circulation system, due to heating agent
Coolant-temperature gage is higher, in order to prevent the vaporization of heat medium water, and heat medium water operating pressure is generally higher, and usual operating pressure is not less than
3.5MPa。
Heat medium water booster：It is arranged on heat medium water system superintendent road, for the water side of heat medium water closed cycle to be overcome to hinder
Power, while adjust the total Water of heat medium water.
Heat medium water adjusts bypass：It is arranged in parallel with heat medium water heat reclaim unit, leads to exhaust gas volumn, cigarette for load variations
During gas temperature change, gas cooler B inlet water temperatures are adjusted in suitable range.
Heat medium water medicine system：The long-term closed cycle operation of heating agent water system, be easy to cause heating agent water ph value and conductivity
Etc. changing, heat medium water medicine system is system dosing, maintains the parameters such as heating agent water ph value and conductivity in constant range.
Safety valve：Safety valve is arranged at the top of expansion tank, when being worked due to heating agent water system, heating agent water pressure is higher,
Temperature is higher, this safety valve is set to can effectively ensure that the safe operation of system.
The beneficial effects of the utility model：
1. commercial plant can be met in different operating modes, by this patent used by flue gas therrmodynamic system, low-temperature SCR takes off
The inlet flue gas temperature of nitre system meets the requirement of low temperature catalyst；
2. the inlet flue gas temperature of low temperature SCR denitration system can be not only heated to by the flue gas therrmodynamic system described in this patent
The temperature in use of low temperature catalyst, and the flue gas heat after low-temperature denitration can be recycled, reach what residual heat integrative utilized
Purpose；
3. this patent system gas cooler A, can be disposed at before deduster, also can be disposed at after deduster, in addition to
Outside the fume afterheat of recyclable commercial plant outlet, efficiency of dust collection also is improved using low temperature dedusting technology after smoke temperature is reduced,
And desulfurization water consume can be reduced；
4. flue gas flow first passes through desulfurizing tower, then cooled down using flue gas heater, low temperature SCR denitration system, flue gas
Enter chimney after device B, flue gas reduces the risk of back-end surfaces and equipment low-temperature corrosion, while enter cigarette after desulfurization
The flue-gas temperature of chimney can be controlled in 80 DEG C or more, and chimney can be effectively prevent to emit the generation of white cigarette phenomenon.
Description of the drawings
Fig. 1 is the device flow diagram of the utility model embodiment；
Wherein 1 commercial plant, 2 dedusters, 3 gas cooler A, 4 desulfurizing towers, 5 flue gas heaters, 6 low temperature SCR denitrations dress
Put, 7 gas cooler B, 8 chimneys, 9 boosters, 10 heat medium water reheaters, 11 expansion tanks, 12 safety valves, 13 heat medium waters
Heat reclaim unit, 14 heat medium water medicine systems, 15 regulating valves, 16 heating agent waterpipes, 17 heat medium waters adjust bypass, 18 low-temperature receivers are situated between
Matter inlet duct, 19 low-temperature receiver media outlet pipelines.
Specific embodiment
Following non-limiting examples are used to illustrate the utility model.
Refering to what is shown in Fig. 1, a kind of flue gas therrmodynamic system suitable for low temperature SCR denitration, including：Commercial plant 1, deduster
2nd, gas cooler A3, desulfurizing tower 4, flue gas heater 5, low temperature SCR denitration device 6, gas cooler B7, chimney 8, heat medium water
Booster 9, heat medium water reheater 10, expansion tank 11, safety valve 12, heat medium water heat reclaim unit 13, heat medium water add
Medicine system 14, regulating valve 15, heating agent waterpipe 16, heat medium water adjust and bypass 17, low-temperature receiver medium inlet pipeline 18, low-temperature receiver medium goes out
Mouth pipeline 19 etc..Wherein heat medium water side uses closed cycle, realizes the transmission of external heat source and flue gas heat；Heating agent water system is set
Expansion tank 11 is put, expansion tank 11 is arranged in as the Tandem of heat medium water in system；Expansion tank 11 is Pressure Vessel,
Not only moisturizing voltage stabilizing, but also the thermal expansion amount of absorbable heat medium water had been played the role of, 11 top of expansion tank is provided with safety valve 12；It is whole
Heat medium water side operation with pressure when covering smoke heat exchanging system operation, operating pressure are not less than 3.5MPa, ensure that heat medium water in flue gas
It is not vaporized after absorbing heat in cooler B7 and heat medium water reheater 10；Heating agent water system is provided with moisturizing pipeline, moisturizing
Pressure has to be larger than the operating pressure of heat medium water, and regulating valve 15 is provided in moisturizing pipeline；Smoke heat exchanging system sets heat medium water
Reheater 10, it is intended in order to improve 5 inlet water temperature of flue gas heater, and the heat that temperature reduces after flue gas heater 5
Remaining heat is passed to cold medium by matchmaker's water by heat medium water heat reclaim unit 13 again；Gas cooler B7 and flue gas
The outlet smoke temperature of device 5 can be controlled freely, can control flue gas by the heating agent coolant-temperature gage that heat medium water reheater 10 exports
Heater 5 exports smoke temperature, can adjust bypass 17 by the heat exchange amount and heat medium water of heat medium water heat reclaim unit 13 to control cigarette
The inlet water temperature of Gas Cooler B7, and then adjust the outlet smoke temperature of gas cooler B7；Smoke heat exchanging system heat medium water side is set
Heat medium water adjusts bypass 17, enters for gas cooler B7 when exhaust gas volumn caused by adjusting load variations and smoke temperature change
Saliva temperature, and then adjust the smoke temperature situation of entire smoke heat exchanging system；Gas cooler B7 inlet water temperatures and flow can be passed through
It adjusts, gas cooler B to be controlled to export smoke temperature 7, can gas cooler B7 be exported by smoke temperature according to coal situation in operation
It reduces to recycle heat as possible；Heat medium water side setting heat medium water booster 9, for overcoming the system resistance of heat medium water side；Heating agent
Water closed circulation system setting heat medium water medicine system 14, heat medium water medicine system 14 is heating agent water system dosing, maintains heating agent
The parameters such as water ph value and conductivity are in constant range；It can be by the adjusting of gas cooler A3 inlet water temperatures and flow, to control
Tobacco curing Gas Cooler A3 exports smoke temperature, can be reduced gas cooler A3 outlets smoke temperature as possible according to coal situation in operation
To recycle heat, while after gas cooler A3 outlets smoke temperature reduction, desulfurization water consumption can be reduced.
A kind of workflow for flue gas therrmodynamic system suitable for low temperature SCR denitration that this patent proposes is as follows：
The flow of fume side：1 → deduster of commercial plant, 2 → gas cooler A3 → 4 → flue gas heater of desulfurizing tower 5 →
6 → gas cooler of low temperature SCR denitration device B7 → chimney 8.
The circulatory system of the heat medium water side for an enclosed, flow are as follows：9 → gas cooler of booster B7 → heat medium water is again
Heating unit 10 → expansion tank, 11 → flue gas heater, 5 → heat medium water heat reclaim unit 13 or heat medium water adjust bypass 17
→ booster 9；
Gas cooler A3 can be disposed at before or after deduster 2, can return the fume afterheat from commercial plant 1
It receives into the low-temperature receivers media such as low pressure condensation water system, boiler air-supply.
The flue gas that gas cooler A3 comes out is directly entered desulfurizing tower 4, and the flue-gas temperature after desulfurization is about 45~50
DEG C, it then carries out being warming up to 200~230 DEG C or so by flue gas heater 5, into low temperature SCR denitration device 6, after denitration
Flue gas enter back into heat release carried out in gas cooler B7, most afterwards through 8 row of chimney into air.
Heat medium water booster 9, gas cooler B7, heat medium water reheater 10, expansion tank 11, flue gas heater 5,
13/ heat medium water of heat medium water heat reclaim unit adjusts the cycle that 17 grades of bypass constitute an enclosed by heating agent waterpipe 16,
Flue gas heater 5 and gas cooler B7 carry out the transmission of heat by heat medium water.
Heat medium water reheater 10 can be used a variety of external heat sources and heat medium water reheated, such as auxiliary steam, electricity
Heating, gas heating etc..
Heat medium water side operation with pressure during a whole set of smoke heat exchanging system operation, operating pressure are not less than 3.5MPa, ensure that heat
Matchmaker's water is not vaporized after absorbing heat in gas cooler B7 and heat medium water reheater 10, and expansion tank 11 is Pressure Vessel,
Not only moisturizing voltage stabilizing, but also the thermal expansion amount of absorbable heat medium water had been played the role of, safety valve 12, expansion are provided at the top of expansion tank
Water tank is provided with moisturizing pipeline, and the pressure of moisturizing has to be larger than the operating pressure of heat medium water, regulating valve is provided in moisturizing pipeline
15。
The flue-gas temperature for each section of the smoke heat exchanging system that this patent proposes is adjustable, load strong applicability.Gas cooler
The exit gas temperature (4 inlet flue gas temperature of desulfurizing tower) of A3, can be adjusted according to this gas cooler A3 inlet water temperatures and water；
The exit gas temperature of gas cooler B7 can be adjusted according to gas cooler B7 inlet water temperatures and water；Flue gas
The exit gas temperature (6 inlet flue gas temperature of low temperature SCR denitration device) of device 5, according to the exit water temperature of gas cooler B7 and outside
The synthesis such as consumption of heat from heat source is adjusted.
The adjusting of each section of flue-gas temperature is finally all adjusted by heating agent coolant-temperature gage and flow, and this patent system
Heat medium water temperature and flow also can be adjusted.Therefore no matter what load commercial plant is under, and this patent proposes
This flue gas therrmodynamic system suitable for low temperature SCR denitration can meet the requirement of low temperature catalyst, while recyclable tail
The waste heat of portion's flue gas.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (10)
1. a kind of flue gas therrmodynamic system suitable for low temperature SCR denitration, including low temperature SCR denitration device, it is characterised in that：Also wrap
Flue gas heater, gas cooler B, booster, expansion tank, the heat medium water for including the heating agent water circulation system for forming enclosed add again
Thermal and heat medium water heat reclaim unit, flue gas heater are arranged on low temperature SCR denitration device portal flue, flue gas cooling
Device B is arranged on low temperature SCR denitration device exhaust pass, and the heating agent water end (W.E.) of heat medium water reheater is connected to gas cooler
The heat medium water of B is exported on the heating agent waterpipe between the heating agent water inlet of flue gas heater, heat medium water heat reclaim unit
The heat medium water that heating agent water end (W.E.) is connected to flue gas heater is exported to heating agent waterpipe between the heating agent water inlet of gas cooler B
On, the heat of heat medium water heat reclaim unit recycling is provided with adjusting for heating low-temperature receiver medium on the pipeline of low-temperature receiver medium inlet
Valve.
2. it is suitable for the flue gas therrmodynamic system of low temperature SCR denitration as described in claim 1, it is characterised in that：Flue gas heater
Heat medium water be exported between the heating agent water inlet of gas cooler B and be additionally provided with heat medium water and adjust bypass, heat medium water adjusts bypass
It is arranged in parallel with the heating agent water end (W.E.) of heat medium water heat reclaim unit.
3. it is suitable for the flue gas therrmodynamic system of low temperature SCR denitration as claimed in claim 2, it is characterised in that：Heat medium water is adjusted
Bypass on the parallel pipeline of the heating agent water end (W.E.) of heat medium water heat reclaim unit with being respectively equipped with regulating valve.
4. it is suitable for the flue gas therrmodynamic system of low temperature SCR denitration as described in claim 1, it is characterised in that：Heat medium water recycles
Heat medium water medicine system is additionally provided in system.
5. it is suitable for the flue gas therrmodynamic system of low temperature SCR denitration as described in claim 1, it is characterised in that：Expansion tank is set
There are safety valve and water supply pipe and its regulating valve.
6. it is suitable for the flue gas therrmodynamic system of low temperature SCR denitration as described in claim 1, it is characterised in that：Further include flue gas
Cooler A, gas cooler A are arranged on the flue that commercial plant is exported between desulfurizing tower, and the heat of off-gas recovery is used for
Low-temperature receiver medium is heated, regulating valve is provided on the pipeline of low-temperature receiver medium inlet.
7. it is suitable for the flue gas therrmodynamic system of low temperature SCR denitration as claimed in claim 6, it is characterised in that：Gas cooler A
It is arranged in before or after deduster.
8. the flue gas therrmodynamic system as described in claim 1 or 6 suitable for low temperature SCR denitration, it is characterised in that：Low-temperature receiver medium
It blows for low-pressure heater system condensation water or boiler.
9. it is suitable for the flue gas therrmodynamic system of low temperature SCR denitration as described in claim 1, it is characterised in that：Heat medium water adds again
Thermal reheats heat medium water using external heat source.
10. it is suitable for the flue gas therrmodynamic system of low temperature SCR denitration as claimed in claim 9, it is characterised in that：External heat source is
Auxiliary steam, electrical heating or gas heating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721421106.4U CN207462994U (en) | 2017-10-30 | 2017-10-30 | A kind of flue gas therrmodynamic system suitable for low temperature SCR denitration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721421106.4U CN207462994U (en) | 2017-10-30 | 2017-10-30 | A kind of flue gas therrmodynamic system suitable for low temperature SCR denitration |
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| CN207462994U true CN207462994U (en) | 2018-06-08 |
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ID=62265711
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| CN201721421106.4U Active CN207462994U (en) | 2017-10-30 | 2017-10-30 | A kind of flue gas therrmodynamic system suitable for low temperature SCR denitration |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109078468A (en) * | 2018-08-24 | 2018-12-25 | 佛山华清智业环保科技有限公司 | A kind of high-efficiency ceramic flue gas processing device |
| CN112604498A (en) * | 2020-12-31 | 2021-04-06 | 成都达奇环境科技有限公司 | Cement kiln flue gas waste heat utilization and purification system and low-temperature SCR denitration system |
-
2017
- 2017-10-30 CN CN201721421106.4U patent/CN207462994U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109078468A (en) * | 2018-08-24 | 2018-12-25 | 佛山华清智业环保科技有限公司 | A kind of high-efficiency ceramic flue gas processing device |
| CN112604498A (en) * | 2020-12-31 | 2021-04-06 | 成都达奇环境科技有限公司 | Cement kiln flue gas waste heat utilization and purification system and low-temperature SCR denitration system |
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