CN202700347U - Smoke selective non-catalytic reduction (SNCR) denitration complete plant - Google Patents
Smoke selective non-catalytic reduction (SNCR) denitration complete plant Download PDFInfo
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- CN202700347U CN202700347U CN 201220325552 CN201220325552U CN202700347U CN 202700347 U CN202700347 U CN 202700347U CN 201220325552 CN201220325552 CN 201220325552 CN 201220325552 U CN201220325552 U CN 201220325552U CN 202700347 U CN202700347 U CN 202700347U
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Abstract
The utility model discloses a smoke selective non-catalytic reduction (SNCR) denitration complete plant which is formed by a solid urea automatic feeding machine, a urea dissolving tank, a centrifugal pump, a filter, a 50% urea liquid storage tank, an electric heater, a dilution water tank, a dilution water pump, a metering pump, a static mixer, a circulation cooling water pool, a circulation cooling water pump, an NOx online monitoring system, a programmable logic control (PLC) central control system, a urea spraying device and a liquid delivery pipeline. By means of the smoke SNCR denitration complete plant, urea solution is atomized completely and then sprayed into a hearth from a temperature window, the system automation is efficient and reliable, operation cost is reduced, and secondary pollution is avoided.
Description
[technical field]
The utility model relates to the NOx treatment facility of flue gas, and is particularly a kind of for flue gas SNCR denitration complete set of equipments.
[background technology]
The gas pollutant of combustion apparatus discharging mainly is sulfur and nitrogen oxides.For the NOx in the purifying smoke, realize the selective catalytic reduction method of main method (SCR) and SNCR method (SNCR) that the denitration discharging is taked.In the SCR method, catalyst costs accounts for about half of SCR system initial outlay usually, and catalyst in use can because of poison, that abrasion was lost efficacy etc. was former thereby need to change, thereby exist the shortcoming that operating cost is high, equipment investment is large, therefore current most employing technology maturation, economic SNCR denitrating flue gas method.
The SNCR method is in the situation that catalyst-free sprays into the reducing agent aqueous solution such as ammonia or urea in the middle of 850-1150 ℃ the flue gas, realizes the reduction reaction of NOx, and NOx is reduced into N
2And H
2O realizes the denitrating flue gas effect.Because the urea good stability is nontoxic, safe, be convenient to storage, therefore adopting urea is optimal selection as the reducing agent of SNCR method.
SNCR method performance is subjected to the impact of the factors such as mixability, thermograde, additive and flue gas atmosphere of temperature window, the time of staying, reactant and flue gas.Spray gun atomizing effect used in the current SNCR method denitrating system is poor, aqueous solution of urea mixes inhomogeneously with flue gas, and denitration efficiency is low; Again because the NOx on-line monitoring system not being installed, cause in the spraying system addition of aqueous solution of urea to be failed according to the NOx change in concentration and corresponding change, so that aqueous solution of urea adds not enough and do not reach best denitration effect when NOx concentration is higher, when NOx concentration is on the low side, then cause the waste of aqueous solution of urea.
[utility model content]
The utility model is in order to solve the above-mentioned deficiency of prior art, a kind of flue gas SNCR denitration complete set of equipments take urea as reducing agent is provided, it has solved the problems such as dissolving, mixing and injection of solid urea particle, the automatical and efficient reliably working of SNCR device can not only be realized, and the effect that denitration efficiency is high, reduce operating cost can be reached.
Above-mentioned purpose of the present utility model realizes by following technical scheme: a kind of flue gas SNCR denitration complete set of equipments is characterized in that: be made of solid urea automatic feeder, urea dissolving tank, centrifugal pump, filter, 50% urea fluid reservoir, electric heater, dilution water pot, dilution water pump, measuring pump, static mixer, circulating cooling pond, circulating cooling water pump, NOx on-line monitoring system, PLC central control system, urea-spray device and liquid-transport pipe-line; Described urea dissolving tank is made of tank body, agitator, the hot device of companion, liquid level gauge, thermometer and densimeter; The input port of described dilution water pump is connected with the dilution water pot, and delivery outlet is connected with described dilution water pipe; The input port of described centrifugal pump I is connected with the urea dissolving tank, and delivery outlet is connected with described liquid-transport pipe-line; Described centrifugal pump II entrance is connected with 50% urea fluid reservoir, and delivery outlet is connected with described liquid-transport pipe-line; By measuring pump frequency conversion dosing, described static mixer has three ports, is connected with the delivery outlet pipeline that is connected water pump with measuring pump respectively, after mixing, is connected with the spray gun liquid-transport pipe-line; The input port of described cooling water pump is connected with the circulating cooling pond, and delivery outlet is connected with the injection apparatus coolant intake pipe; Described urea-spray device is made of spray gun, air compressor machine and compressed air piping, and spray gun directly embeds the boiler side wall.
Described urea dissolving tank upper end is connected with solid urea automatic feeder, deionization water pipe; The urea dissolving tank is provided with the hot device of companion, agitator, thermometer, densimeter and liquid level gauge; When liquid level dropped to assigned scale in the dissolving tank, the urea automatic feeder added quantitative solid urea particle in dissolving tank, and the deionized water control valve is opened in dissolving tank and added quantitative deionized water.
Described centrifugal pump I front end is provided with filter, prevents that atomizer from stopping up, and 50% urea liquid after filtering is transported in the 50% urea fluid reservoir and stores.
Described 50% urea fluid reservoir is provided with the hot device of companion, thermometer, liquid level gauge, when urea liquid level in the fluid reservoir drops to when a certain amount of, information is fed back to the PLC central control system, middle control receives that the backward centrifugal pump of information sends instruction, centrifugal pump starts and begins the urea liquid in the dissolving tank is transported to the urea fluid reservoir, and centrifugal pump cuts out when liquid level in the tank arrives assigned scale.
Described 50% urea fluid reservoir rear end liquid-transport pipe-line is provided with filter, centrifugal pump II, return duct, motor-driven valve, dilution water pump, measuring pump, static mixer.
Described centrifugal pump II front end is provided with filter, and the rear end is provided with electric heater, return duct, motor-driven valve, and the setting of filter is to prevent that atomizer from stopping up, and the setting of electric heater is to prevent the urea liquid crystallisation by cooling for urea liquid being heated to assigned temperature.
Described measuring pump, NOx on-line monitoring instrument are used for accurate measurement and the urea solution jet amount that independently controls to each inlet zone in the boiler; Adopt independently urea flow-control, by the NOx on-line monitoring system NOx change in concentration information is fed back to the PLC central control system, middle control is sent instruction again and is regulated metering pump discharge, urea guality control flow.
Described static mixer one end is connected with the measuring pump delivery outlet, and an end is connected with dilution water pump delivery outlet, and an end is connected with the urea liquid-transport pipe-line.
Described urea-spray device, by the air compressor machine input compressed-air, compressed air and the urea liquid range of atomization in spray gun mixes, and urea liquid is by high atomisation, and the urea liquid after the atomizing sprays into burner hearth.
The valve that arranges on described deionized water liquid-transport pipe-line, dilution water liquid-transport pipe-line, reflux line and the urea liquid liquid-transport pipe-line is motor-driven valve, and the valve that arranges on the gas pipeline of spraying urea liquid injection device is magnetic valve.
Be provided with cooling sea water regulating valve on the described cooling water liquid-transport pipe-line, the control cooling water flow.
Solid urea automatic feeder described in above-mentioned the utility model, urea dissolving tank, centrifugal pump, 50% urea fluid reservoir, dilution water pot, dilution water pump, measuring pump, static mixer, circulating cooling water pump, cooling sea water regulating valve, motor-driven valve, magnetic valve, spraying urea liquid injection device all can adopt known technology of the prior art, relevant above-mentioned known solution, those skilled in the art all understands, does not repeat them here.
Operation principle of the present utility model is; When liquid level dropped to assigned scale in the urea dissolving tank, liquid level gauge fed back to the PLC central control system with information, and central control system receives that the backward demineralized water control valve of information sends instruction, began to add in dissolving tank the demineralized water of fixed amount; Then the automatic feeder solid urea particle that begins to add uniformly, the urea concentration meter is used for measuring the dissolving tank urea concentration and feeds back to central control system after urea concentration reaches 50%, stops to add urea granules; The urea liquid temperature will remain on about 50 ℃ in the dissolving tank, therefore accompanies hot device to begin heating, stopped heating when temperature reaches 60 ℃ when the thermometer displays temperature is lower than 45 ℃.
When liquid level drops to certain scale in the fluid reservoir, liquid level gauge feeds back to the PLC central control system with information, central control system receives that the backward centrifugal pump of information sends instruction, centrifugal pump starts and begins the urea liquid in the dissolving tank is transported to the urea fluid reservoir, and centrifugal pump cuts out when liquid level in the tank arrives assigned scale; Fluid temperature will remain on about 50 ℃, therefore accompanies hot device to begin heating, stopped heating when temperature reaches 60 ℃ when the thermometer displays temperature is lower than 45 ℃.
NOx on-line monitoring instrument is monitored out smoke road junction NOx concentration, information is fed back to the PLC central control system, central control system receives that the backward measuring pump of information sends instruction, 50% urea liquid is quantitatively squeezed in the static mixer by centrifugal pump and measuring pump, with mix from the deionized dilution water of dilution in the water pot, with configuration urea weak solution, the compressed air that urea weak solution and air compressor machine produce sprays into boiler furnace after urea solution jet device high atomisation, the urea liquid of high atomisation fully mixes with flue gas, and the NOx in the flue gas is reduced into CO
2And H
2O, thus reach the denitrating flue gas effect.In running, open the circulating cooling water pump of urea-spray dress device, prevent that injector from high temperature damaging for a long time.
The utility model advantage compared with prior art is: the utility model has improved the NOx removal effect by the optimal design to system, has realized increasingly automated operation, has reduced investment and operation operating cost, and the non-secondary pollution problem.
[description of drawings]
Fig. 1 is structural representation of the present utility model.
[specific embodiment]
Below in conjunction with accompanying drawing the utility model is described in further detail:
As shown in Figure 1, consisted of by solid urea automatic feeder 1, urea dissolving tank 4, centrifugal pump 6, centrifugal pump 10, filter 5, filter 9,50% urea fluid reservoir 8, electric heater 12, dilution water pot 15, dilution water pump 16, measuring pump 19, static mixer 20, circulating cooling pond 26, circulating cooling water pump 27, NOx on-line monitoring system 31, PLC central control system 32, urea-spray device and liquid-transport pipe-line 7, liquid-transport pipe-line 11, liquid-transport pipe-line 21; Described urea dissolving tank 4 is made of tank body, agitator 33, the hot device 34 of companion, liquid level gauge 35, thermometer 36 and densimeter 37; The input port of described dilution water pump 16 is connected with dilution water pot 15, and delivery outlet is connected with described dilution water pipe 18; The input port of described centrifugal pump 6 is connected with urea dissolving tank 8, and delivery outlet is connected with described liquid-transport pipe-line 7; Described centrifugal pump 10 entrances are connected with 50% urea fluid reservoir 8, and delivery outlet is connected with described liquid-transport pipe-line 12; By measuring pump 19 frequency conversion dosings, described static mixer 20 has three ports, is connected with the delivery outlet pipeline that is connected water pump 16 with measuring pump 19 respectively, after mixing, is connected with spray gun liquid-transport pipe-line 21; The input port of described cooling water pump 27 is connected with circulating cooling pond 26, and delivery outlet is connected with injection apparatus coolant intake pipe 28; Described urea-spray device is made of spray gun 30, air compressor machine 22 and compressed air piping 23, and spray gun directly embeds the boiler side wall.
Described urea dissolving tank 4 upper ends are connected with solid urea automatic feeder 1, demineralized water water inlet pipe 2; Urea dissolving tank 4 is provided with the hot device 34 of companion, agitator 33, thermometer 36, densimeter 37 and liquid level gauge 35; When liquid level dropped to assigned scale in the dissolving tank 4, urea automatic feeder 1 added quantitative solid urea particle in dissolving tank, and deionized water control valve 3 is opened in dissolving tank and added quantitative deionized water.
Described centrifugal pump 6 front ends are provided with filter 5, prevent that atomizer from stopping up, and 50% urea liquid after filtering is transported in the 50% urea fluid reservoir 8 and stores.
Described 50% urea fluid reservoir 8 is provided with the hot device 38 of companion, thermometer 40, liquid level gauge 39, when urea liquid level in the fluid reservoir 8 drops to when a certain amount of, information is fed back to PLC central control system 32, middle control receives that the backward centrifugal pump of information sends instruction, centrifugal pump 6 starts and begins the urea liquid in the dissolving tank 4 is transported to urea fluid reservoir 8, and centrifugal pump cuts out when liquid level in the tank arrives assigned scale.
Described 50% urea fluid reservoir, 8 rear end liquid-transport pipe-lines are provided with filter 9, centrifugal pump 10, return duct 14, motor-driven valve 13, dilution water pump 16, measuring pump 19, static mixer 20.
Described centrifugal pump 10 front ends are provided with filter 9, the rear end is provided with electric heater 12, return duct 14, motor-driven valve 13, the setting of filter is to prevent that atomizer from stopping up, and the setting of electric heater is to prevent the urea liquid crystallisation by cooling for urea liquid being heated to assigned temperature.
Described measuring pump 19, NOx on-line monitoring instrument 31 are used for accurate measurement and the urea solution jet amount that independently controls to each inlet zone in the burner hearth; Adopt independently urea flow-control, by the NOx on-line monitoring system NOx change in concentration information is fed back to PLC central control system 32, middle control is sent instruction again and is regulated metering pump discharge, urea guality control flow.
Described static mixer 20 1 ends are connected with measuring pump 19 delivery outlets, and an end is connected with dilution water pump 16 delivery outlets, and an end is connected with urea liquid-transport pipe-line 21.
Described urea-spray device, by air compressor machine 22 input compressed-airs, compressed air and the urea liquid range of atomization in spray gun mixes, and urea liquid is by high atomisation, and the urea liquid after the atomizing sprays into burner hearth.
The valve that arranges on described demineralized water inlet channel 2, dilution water liquid-transport pipe-line 18, reflux line 14 and urea liquid liquid-transport pipe-line 7, liquid-transport pipe-line 11, the liquid-transport pipe-line 21 is motor-driven valve 3, motor-driven valve 13, motor-driven valve 17, motor-driven valve 25, and the valve that arranges on the gas pipeline 23 of spraying urea liquid injection device is magnetic valve 24.
Be provided with cooling sea water regulating valve 29 on the described cooling water liquid-transport pipe-line 28, the control cooling water flow.
Operation principle of the present utility model is: when liquid level drops to assigned scale in the urea dissolving tank, liquid level gauge feeds back to the PLC central control system with information, central control system receives that the backward demineralized water control valve of information sends instruction, begins to add in dissolving tank the demineralized water of fixed amount; Then the automatic feeder solid urea particle that begins to add uniformly, the urea concentration meter is used for measuring the dissolving tank urea concentration, feeds back to central control system after urea concentration reaches 50%, stops to add urea granules; The urea liquid temperature will remain on about 50 ℃ in the dissolving tank, therefore accompanies hot device to begin heating, stopped heating when temperature reaches 60 ℃ when the thermometer displays temperature is lower than 45 ℃.
When liquid level drops to certain scale in the fluid reservoir, liquid level gauge feeds back to the PLC central control system with information, central control system receives that the backward centrifugal pump of information sends instruction, centrifugal pump starts and begins the urea liquid in the dissolving tank is transported to the urea fluid reservoir, and centrifugal pump cuts out when liquid level in the tank arrives assigned scale; Fluid temperature will remain on about 50 ℃, therefore accompanies hot device to begin heating, stopped heating when temperature reaches 60 ℃ when the thermometer displays temperature is lower than 45 ℃.
NOx on-line monitoring instrument is monitored out smoke road junction NOx concentration, information is fed back to the PLC central control system, central control system receives that the backward measuring pump of information sends instruction, 50% urea liquid is quantitatively squeezed in the static mixer by centrifugal pump and measuring pump, with mix from the deionized dilution water of dilution in the water pot, with configuration urea weak solution, the compressed air that urea weak solution and air compressor machine produce sprays into burner hearth after urea solution jet device high atomisation, the urea liquid of high atomisation fully mixes with flue gas, NOx in the flue gas is reduced into CO2 and H2O, thereby reaches the denitrating flue gas effect.In running, open the circulating cooling water pump of urea-spray dress device, prevent that injector from high temperature damaging for a long time.
It should be noted that at last: above-described embodiment only is for the utility model example clearly is described; and be not restriction to embodiment; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here need not also can't give all embodiments exhaustive, and the apparent variation of being amplified out thus or the change still be among the protection domain of the present utility model.
Claims (8)
1. a flue gas SNCR denitration complete set of equipments is made of solid urea automatic feeder, urea dissolving tank, centrifugal pump, filter, 50% urea fluid reservoir, electric heater, dilution water pot, dilution water pump, measuring pump, static mixer, circulating cooling pond, circulating cooling water pump, NOx on-line monitoring system, PLC central control system, urea-spray device and liquid-transport pipe-line; Described urea dissolving tank is made of tank body, agitator, the hot device of companion, liquid level gauge, thermometer and densimeter; The input port of described dilution water pump is connected with the dilution water pot, and delivery outlet is connected with described dilution water pipe; The input port of described centrifugal pump I is connected with the urea dissolving tank, and delivery outlet is connected with described liquid-transport pipe-line; Described centrifugal pump II entrance is connected with 50% urea fluid reservoir, and delivery outlet is connected with described liquid-transport pipe-line; By measuring pump frequency conversion dosing, described static mixer has three ports, is connected with the delivery outlet pipeline that is connected water pump with measuring pump respectively, after mixing, is connected with the spray gun liquid-transport pipe-line; The input port of described cooling water pump is connected with the circulating cooling pond, and delivery outlet is connected with the injection apparatus coolant intake pipe; Described urea-spray device is made of spray gun, air compressor machine and compressed air piping, and spray gun directly embeds the boiler side wall.
2. a kind of flue gas SNCR denitration complete set of equipments according to claim 1 is characterized in that: described urea dissolving tank is provided with the hot device of companion, agitator, thermometer, densimeter and liquid level gauge.
3. a kind of flue gas SNCR denitration complete set of equipments according to claim 1, it is characterized in that: described centrifugal pump I front end is provided with filter, prevents that atomizer from stopping up.
4. a kind of flue gas SNCR denitration complete set of equipments according to claim 1 is characterized in that: described 50% urea fluid reservoir is provided with the hot device of companion, thermometer, liquid level gauge.
5. a kind of flue gas SNCR denitration complete set of equipments according to claim 1, it is characterized in that: described 50% urea fluid reservoir rear end liquid-transport pipe-line is provided with filter, centrifugal pump II, return duct, motor-driven valve, dilution water pump, measuring pump, static mixer.
6. a kind of flue gas SNCR denitration complete set of equipments according to claim 1, it is characterized in that: described centrifugal pump II front end is provided with filter, and the rear end is provided with electric heater, reflux line, motor-driven valve.
7. a kind of flue gas SNCR denitration complete set of equipments according to claim 1, it is characterized in that: described static mixer one end is connected with the measuring pump delivery outlet, and an end is connected with dilution water pump delivery outlet, and an end is connected with the urea liquid-transport pipe-line.
8. a kind of flue gas SNCR denitration complete set of equipments according to claim 1, it is characterized in that: the valve that arranges on described deionized water liquid-transport pipe-line, dilution water liquid-transport pipe-line, reflux line and the urea liquid liquid-transport pipe-line is motor-driven valve, and the valve that arranges on the gas pipeline of spraying urea liquid injection device is magnetic valve.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103691292A (en) * | 2013-12-25 | 2014-04-02 | 太原锅炉集团有限公司 | SNCR denitration system of circulating fluidized bed boiler based on flow-state reconstruction |
| CN103691291A (en) * | 2013-12-25 | 2014-04-02 | 华纺股份有限公司 | Process for carrying out denitration on incineration flue gas generated by printing and dyeing sludge |
| CN103977705A (en) * | 2014-04-23 | 2014-08-13 | 浙江省环境保护科学设计研究院 | Reducing agent metering for cement clinker production line SNCR flue gas denitration and control system and method thereof |
| CN104307338A (en) * | 2014-10-29 | 2015-01-28 | 成都快典科技有限公司 | Urea SNCR (Selective Non-Catalytic Reduction) system |
| CN105797548A (en) * | 2016-05-07 | 2016-07-27 | 南京帝艾环境科技工程有限公司 | Integrated system for denitration of oil-burning and gas-burning boiler |
| CN105903331A (en) * | 2016-06-18 | 2016-08-31 | 杭州新际能源科技有限公司 | Full-automatic SNCR flue gas denitration system and flue gas denitration control method |
| CN106215647A (en) * | 2016-08-30 | 2016-12-14 | 中国华能集团公司 | A kind of built-in SNCR spray gun |
| CN106958820A (en) * | 2017-03-23 | 2017-07-18 | 李学良 | A kind of solid combustible reclaims power generation and heat supply system |
| CN108159869A (en) * | 2018-01-15 | 2018-06-15 | 中国华电科工集团有限公司 | Flue gas denitrification system urea measuring and injecting device and method |
| CN109569246A (en) * | 2018-12-27 | 2019-04-05 | 河南海力特机电制造有限公司 | Heavy pressure fine spray desulfurization device |
| CN111482067A (en) * | 2020-03-05 | 2020-08-04 | 华电电力科学研究院有限公司 | Method for adding active substances to improve efficiency in SNCR (selective non-catalytic reduction) denitration technology |
| CN114733336A (en) * | 2022-04-08 | 2022-07-12 | 华润电力(宁武)有限公司 | System for preventing urea solution conveying pipeline from being blocked |
| CN114887483A (en) * | 2022-04-16 | 2022-08-12 | 无锡迅德环保工程有限公司 | Treatment-based nuclear spent fuel tail gas treatment system |
| CN116025852A (en) * | 2023-03-28 | 2023-04-28 | 国能龙源环保有限公司 | Method for reducing urea solution temperature in urea solution storage tank |
-
2012
- 2012-06-29 CN CN 201220325552 patent/CN202700347U/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103691292A (en) * | 2013-12-25 | 2014-04-02 | 太原锅炉集团有限公司 | SNCR denitration system of circulating fluidized bed boiler based on flow-state reconstruction |
| CN103691291A (en) * | 2013-12-25 | 2014-04-02 | 华纺股份有限公司 | Process for carrying out denitration on incineration flue gas generated by printing and dyeing sludge |
| CN103977705A (en) * | 2014-04-23 | 2014-08-13 | 浙江省环境保护科学设计研究院 | Reducing agent metering for cement clinker production line SNCR flue gas denitration and control system and method thereof |
| CN104307338A (en) * | 2014-10-29 | 2015-01-28 | 成都快典科技有限公司 | Urea SNCR (Selective Non-Catalytic Reduction) system |
| CN105797548A (en) * | 2016-05-07 | 2016-07-27 | 南京帝艾环境科技工程有限公司 | Integrated system for denitration of oil-burning and gas-burning boiler |
| CN105903331B (en) * | 2016-06-18 | 2018-05-01 | 杭州新际能源科技有限公司 | Full-automatic SNCR flue gas denitrification systems and its denitrating flue gas control method |
| CN105903331A (en) * | 2016-06-18 | 2016-08-31 | 杭州新际能源科技有限公司 | Full-automatic SNCR flue gas denitration system and flue gas denitration control method |
| CN106215647A (en) * | 2016-08-30 | 2016-12-14 | 中国华能集团公司 | A kind of built-in SNCR spray gun |
| CN106215647B (en) * | 2016-08-30 | 2019-05-17 | 中国华能集团公司 | A kind of built-in SNCR spray gun |
| CN106958820A (en) * | 2017-03-23 | 2017-07-18 | 李学良 | A kind of solid combustible reclaims power generation and heat supply system |
| CN108159869A (en) * | 2018-01-15 | 2018-06-15 | 中国华电科工集团有限公司 | Flue gas denitrification system urea measuring and injecting device and method |
| CN109569246A (en) * | 2018-12-27 | 2019-04-05 | 河南海力特机电制造有限公司 | Heavy pressure fine spray desulfurization device |
| CN111482067A (en) * | 2020-03-05 | 2020-08-04 | 华电电力科学研究院有限公司 | Method for adding active substances to improve efficiency in SNCR (selective non-catalytic reduction) denitration technology |
| CN114733336A (en) * | 2022-04-08 | 2022-07-12 | 华润电力(宁武)有限公司 | System for preventing urea solution conveying pipeline from being blocked |
| CN114887483A (en) * | 2022-04-16 | 2022-08-12 | 无锡迅德环保工程有限公司 | Treatment-based nuclear spent fuel tail gas treatment system |
| CN116025852A (en) * | 2023-03-28 | 2023-04-28 | 国能龙源环保有限公司 | Method for reducing urea solution temperature in urea solution storage tank |
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