CN112774436A - Device and method for preparing SCR denitration reducing agent with flue gas heating system - Google Patents
Device and method for preparing SCR denitration reducing agent with flue gas heating system Download PDFInfo
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- CN112774436A CN112774436A CN202110112309.XA CN202110112309A CN112774436A CN 112774436 A CN112774436 A CN 112774436A CN 202110112309 A CN202110112309 A CN 202110112309A CN 112774436 A CN112774436 A CN 112774436A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/82—Combinations of dissimilar mixers
- B01F33/821—Combinations of dissimilar mixers with consecutive receptacles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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Abstract
A device and a method for preparing an SCR denitration reducing agent with a flue gas heating system are provided, and the flue gas heating system is utilized to complete the preparation of the SCR denitration reducing agent. And directly spraying a reducing agent solution into a high-temperature flue of the flue gas heating system, mixing ammonia gas evaporated by the high-temperature flue gas with the high-temperature flue gas, and then sending the mixture into the original flue gas flue through the high-temperature flue gas to be mixed with the original flue gas to provide a reducing agent required by denitration, wherein the reducing agent solution can be ammonia water or a urea solution. Compared with the traditional SCR denitration reducing agent preparation system, the system does not need to be provided with an evaporator, an ammonia-air mixer, a dilution fan, a dilution air heating device, an ammonia spraying grid and the like, and has the advantages of simple system, easiness in control, low investment and the like.
Description
Technical Field
The invention relates to a device and a method for preparing an SCR denitration reducing agent with a flue gas heating system, which are particularly suitable for the technical field of low-temperature flue gas SCR denitration.
Background
At present, the SCR denitration reducing agent preparation method mainly comprises three methods, namely a liquid ammonia method, an ammonia water method and a urea method, wherein the liquid ammonia method or the ammonia water method usually uses steam or hot flue gas as a heat source and generates ammonia gas through an evaporator. The urea method can be divided into a hydrolysis method and a pyrolysis method, wherein the hydrolysis method uses high-pressure steam as a heat source and generates ammonia gas through a hydrolyzer; pyrolysis generally uses fuel gas or fuel oil as fuel, and ammonia gas is generated through a pyrolysis furnace. The ammonia gas prepared in the process is mixed with the dilution air to form mixed gas with the volume concentration of the ammonia gas being less than 5%, then the mixed gas is sent into a flue through an ammonia spraying grid AIG to be mixed with the original flue gas, and the mixed gas enters an SCR reactor to complete denitration reaction.
The three methods are bulky, particularly the urea method, the system is very complex, and the system needs an external heat source or fuel, and an evaporator pyrolyzer, an ammonia-air mixer, a dilution fan, a dilution air heating device, an ammonia injection grid and the like.
For flue gas with lower temperature, when a mature SCR denitration process is adopted, a flue gas heating system is required to heat the flue gas to raise the temperature. The reducing agent can be directly sprayed into the flue at the outlet of the heating furnace, evaporated into ammonia gas under the action of hot flue gas, mixed with high-temperature flue gas, and mixed into the original flue gas through a hot air distribution device to achieve the denitration condition. An evaporator, an ammonia-air mixer, a dilution fan, a dilution air heating device, an ammonia spraying grid and the like are not required to be arranged, so that the system is greatly simplified, and the investment and the occupied area are saved.
Disclosure of Invention
The invention provides a device and a method for preparing an SCR denitration reducing agent with a flue gas heating system. And arranging an ammonia spraying device in a high-temperature flue at the outlet of the heating furnace, spraying a reducing agent solution into the high-temperature flue, evaporating the hot flue gas into ammonia gas, mixing the ammonia gas and the flue gas into the original flue gas, and providing a reducing agent required by denitration.
A SCR denitration reducing agent preparation device with a flue gas heating system comprises: a reducing agent solution storage tank 1, a reducing agent solution delivery pump 2, a reducing agent solution regulating valve 3, a reducing agent solution flow meter 4, an atomizing spray gun 5, a compressed air regulating valve 6, a compressed air flow meter 7, a heating furnace 8, a high-temperature flue gas pipeline 9, a hot air bellow 10, a hot air distribution pipe 11, a denitration inlet flue 12, a GGH flue gas heat exchanger raw flue gas side 13, a vertical flue 14, a static mixer 15, an SCR reactor 16, a GGH flue gas heat exchanger clean flue gas side 17, a denitration outlet flue 18 and a high-temperature flue gas mixer (19);
a hole is formed in a high-temperature flue gas flue 9 at the outlet of the heating furnace 8, and an atomizing spray gun 5 is installed; a reducing agent solution regulating valve 3 and a reducing agent solution flow meter 4 are arranged on a reducing agent solution pipeline connected with an atomizing spray gun 5; a compressed air regulating valve 6 and a compressed air flow meter 7 are arranged on a compressed air pipeline connected with the atomizing spray gun 5; the reducing agent solution storage tank 1 is sequentially connected with a reducing agent solution delivery pump 2, a reducing agent solution regulating valve 3, a reducing agent solution flowmeter 4 and an atomizing spray gun 5 through a reducing agent solution pipeline; a high-temperature flue gas mixer (19) is arranged on the high-temperature flue (9) at the downstream of the atomizing spray gun (5); the high-temperature flue gas pipeline 9 is connected with a hot air bellow 10; the hot air bellows 10 is connected with a hot air distributing pipe 11, and the hot air distributing pipe 11 is arranged in a vertical flue 14; the denitration inlet flue 12 is connected with a vertical flue 14 through a raw flue gas side 13 of the GGH heat exchanger; the hot air distribution pipe 11 is positioned above the original flue gas side 13 of the GGH heat exchanger, and the static mixer 15 is arranged in the vertical flue 14 and positioned above the hot air distribution pipe 11; the upper end of the vertical flue 14 is connected with an SCR denitration reactor 16, and the SCR denitration reactor 16 is connected with a denitration outlet flue 18 through a GGH heat exchanger clean flue gas side 17.
A denitration catalyst is arranged in the SCR reactor 16, and a soot blower is arranged on the SCR reactor 16.
The atomizing spray guns (5) are arranged on the same section or a plurality of sections of the high-temperature flue gas flue (9), and each atomizing spray gun is independently provided with a reducing agent solution regulating valve (3) and a reducing agent solution flow meter (4).
A preparation method of an SCR denitration reducing agent with a flue gas reheating system comprises the following steps:
step one, opening a hole in a flue at the outlet of a heating furnace, and installing an atomizing spray gun;
secondly, the atomizing spray gun adopts a mode of combining direct atomization of a reducing agent solution and secondary atomization of compressed air; a reducing agent solution and a compressed air pipeline connected with the atomizing spray gun are respectively provided with a flow regulating valve and a metering device, and the atomizing effect of the reducing agent solution and the metering device is ensured by regulating the flow;
spraying the reducing agent solution into a high-temperature flue at the outlet of the heating furnace through an atomizing spray gun, gasifying the reducing agent solution into ammonia gas in the high-temperature flue, and conveying the ammonia gas and the high-temperature flue gas to a hot air bellows through a high-temperature flue gas pipeline;
fourthly, mixed gas containing ammonia gas in the hot air bellows is sent into the vertical flue through a hot air distribution pipe;
step five, enabling the raw flue gas to enter the raw flue gas side of the GGH heat exchanger from the denitration inlet flue, and enabling the raw flue gas to enter a vertical flue after heat exchange;
mixing the high-temperature flue gas containing ammonia gas fed through the hot air distribution pipe in the fourth step with the raw flue gas fed in the fifth step in the vertical flue, uniformly mixing the ammonia gas and the flue gas through the disturbance action of a static mixer and a flow guide device, and simultaneously increasing the temperature of the mixed high-temperature flue gas and the raw flue gas;
and step seven, the flue gas in the step six enters an SCR denitration reactor, enters the clean flue gas side of the GGH heat exchanger after the denitration reaction is finished in the reactor, and enters a flue gas denitration outlet flue after heat exchange.
Compared with the prior art, the invention has the beneficial effects that:
1. the reducing agent required by SCR denitration is prepared by utilizing the high-temperature flue gas of the flue gas heating system, and equipment such as an evaporator pyrolysis furnace, a dilution fan, an ammonia air mixer, an ammonia spraying grid and the like is not required to be arranged, so that the system is simplified, and the investment and the occupied area are saved.
2. The ammonia gas that evaporates in high temperature flue directly mixes with the flue gas, can dilute below the safe concentration fast, and high temperature flue is in under the negative pressure environment, has avoided revealing of ammonia, and the security is higher.
3. The flue gas temperature is high, the flue gas volume is large, sufficient heat is provided to ensure that the reducing agent solution is completely evaporated, and the problem of treatment of residual liquid is solved.
4. The evaporated ammonia gas is firstly mixed with the high-temperature flue gas, and is secondly mixed with the original flue gas after being sent into the vertical flue through the hot air distribution pipe, so that the mixing uniformity is improved, and the denitration reaction efficiency is favorably improved.
5. The reducing agent solution can adopt ammonia water or urea solution, and the application range is wider.
Drawings
Fig. 1 is a schematic diagram of a method for preparing an SCR denitration reducing agent with a flue gas heating system according to the present invention.
Fig. 2 is a schematic view of the mounting position of the atomizing spray gun.
The reference numbers illustrate:
1-reducing agent solution storage tank, 2-reducing agent solution delivery pump, 3-reducing agent solution regulating valve, 4-reducing agent solution flowmeter, 5-atomizing spray gun, 6-compressed air regulating valve, 7-compressed air flowmeter, 8-heating furnace, 9-high temperature flue gas pipeline, 10-hot air bellow, 11-hot air distribution pipe, 12-denitration inlet flue, 13-GGH flue gas heat exchanger raw flue gas side, 14-vertical flue, 15-static mixer, 16-SCR reactor, 17-GGH flue gas heat exchanger clean flue gas side, 18-denitration outlet flue, and 19-high temperature flue gas mixer.
Detailed Description
A preparation method of an SCR denitration reducing agent with a flue gas heating system mainly comprises the following steps: the system comprises a reducing agent solution storage tank 1, a reducing agent solution delivery pump 2, a reducing agent solution regulating valve 3, a reducing agent solution flow meter 4, an atomizing spray gun 5, a compressed air regulating valve 6, a compressed air flow meter 7, a heating furnace 8, a high-temperature flue gas pipeline 9, a hot air bellow 10, a hot air distribution pipe 11, a denitration inlet flue 12, a GGH flue gas heat exchanger raw flue gas side 13, a vertical flue 14, a static mixer 15, an SCR reactor 16, a GGH flue gas heat exchanger clean flue gas side 17, a denitration outlet flue 18 and a high-temperature flue gas mixer (19). .
An atomizing spray gun 5 is arranged on a high-temperature flue gas pipeline 9 at the outlet of a heating furnace 8, a reducing agent solution is directly sprayed into the high-temperature flue gas pipeline 9, the high-temperature flue gas is evaporated into ammonia gas, the evaporated ammonia gas and the high-temperature flue gas are mixed and then are sent into a vertical flue 14 through the high-temperature flue gas pipeline 9, a hot air bellows 10 and a hot air distribution pipe 11, the mixture is mixed with the original flue gas and then is uniformly mixed through the mixing action of a static mixer 15, and finally the mixture enters an SCR reactor 16 to complete denitration reaction.
The atomizing spray gun 5 is made of high-temperature-resistant, corrosion-resistant and wear-resistant materials and is provided with a cooling system to protect the atomizing spray gun from being damaged due to high temperature.
The quantity and the position of atomizing spray gun 5, spray angle etc. are confirmed according to flue size, flue gas temperature etc. should adopt in the same direction as spouting the form, can set up at the same cross-section or a plurality of cross-sections of high temperature flue gas flue (9) to the accessible is adjusted atomizing spray gun (5) and is inserted the degree of depth regulation of high temperature flue gas flue (9) and spout the homogeneity of ammonia, and simultaneously, the low reaches of atomizing spray gun 5 set up high temperature flue gas blender 19 in high temperature flue gas pipeline 9, with the help of CFD analog computation auxiliary design, guarantee the homogeneity of mixing.
The spray angle of the atomizing spray gun 5 should ensure that the sprayed liquid is not directly sprayed to the inner wall (refractory material) of the high-temperature flue gas pipeline 9, so as to avoid cracking of the refractory material.
The atomizing spray gun 5 is provided with a reducing agent solution regulating valve 3, the flow is regulated according to the required ammonia spraying amount, the uniformity of ammonia spraying can be controlled by controlling the flow of different atomizing spray guns 5, and the utilization rate of the reducing agent is improved.
In order to clearly understand the technical features and effects of the present invention, the detailed description will be given with reference to the accompanying drawings.
Step 1: the high-temperature flue gas flue 9 at the outlet of the heating furnace 8 is provided with a hole, the atomizing spray gun 5 is installed, the number and the position of the spray guns, the spray angle and the like are determined according to the flue size, the flue gas temperature and the like, a forward spray form is adopted, the same section or a plurality of sections of the high-temperature flue gas flue (9) can be arranged, the uniformity of ammonia spraying can be adjusted by adjusting the depth of the atomizing spray gun (5) inserted into the high-temperature flue gas flue (9), meanwhile, the downstream of the atomizing spray gun 5 in the high-temperature flue gas pipeline 9 is provided with a high-temperature flue gas mixer 19, and the mixing uniformity is ensured by means of CFD.
Step 2: a reducing agent solution regulating valve 3 and a reducing agent solution flow meter 4 are arranged on a reducing agent solution pipeline connected with an atomizing spray gun 5; install compressed air governing valve 6 and compressed air flowmeter 7 on the compressed air pipeline of being connected with atomizing spray gun 5, through adjusting flow, guarantee its atomization effect, improve the homogeneity of mixing.
And step 3: the reducing agent solution from the reducing agent solution storage tank 1 is conveyed to the atomizing spray gun 5 through the reducing agent solution conveying pump 2, is sprayed into a high-temperature flue gas flue 9 at the outlet of the heating furnace 8 through the atomizing spray gun 5, is gasified into ammonia gas in the high-temperature flue gas flue, and is conveyed to a hot air bellows 10 together with the high-temperature flue gas through a high-temperature flue gas pipeline 9.
And 4, step 4: the mixed gas containing ammonia in the hot air bellows 10 is sent into the vertical flue 14 through the hot air distribution pipe 11.
And 5: raw flue gas enters a raw flue gas side 13 of the GGH heat exchanger from a denitration inlet flue 12, and enters a vertical flue 14 after heat exchange.
Step 6: the high-temperature flue gas containing ammonia gas and fed by the hot air distribution pipe 11 in the step 4 is mixed with the original flue gas fed by the step 5 in the vertical flue 14, the ammonia gas and the flue gas are uniformly mixed under the disturbance action of the static mixer 15 and the flow guide device, meanwhile, the temperature of the mixed high-temperature flue gas and the original flue gas is increased, the temperature distribution also reaches a certain uniform degree, and the denitration requirement is met.
And 7: the flue gas in the step 6 enters an SCR denitration reactor 16, enters a clean flue gas side 17 of a GGH heat exchanger after denitration reaction is completed in the reactor, and enters a flue gas denitration outlet flue 18 after heat exchange.
Further: the atomizing spray gun 5 in the step 1 is made of high-temperature-resistant, corrosion-resistant and wear-resistant materials, is provided with a cooling system, and is cooled by cooling water or cooling air to prevent the atomizing spray gun from being damaged due to high temperature.
Further: in the above steps, the arrangement forms and positions of the atomizing spray gun 5, the hot air distribution pipe 11, the static mixer 15 and the flow guide device are determined by simulation analysis and calculation of CFD fluid calculation software, and finally the flue gas at the outlet of the SCR denitration reactor 16 is ensured to reach the emission standard.
Claims (4)
1. The utility model provides a take flue gas heating system's SCR denitration reductant preparation facilities which characterized in that: the device comprises: the system comprises a reducing agent solution storage tank (1), a reducing agent solution delivery pump (2), a reducing agent solution regulating valve (3), a reducing agent solution flow meter (4), an atomizing spray gun (5), a compressed air regulating valve (6), a compressed air flow meter (7), a heating furnace (8), a high-temperature flue gas pipeline (9), a hot air bellow (10), a hot air distribution pipe (11), a denitration inlet flue (12), a GGH flue gas heat exchanger raw flue gas side (13), a vertical flue (14), a static mixer (15), an SCR reactor (16), a GGH flue gas heat exchanger clean flue gas side (17), a denitration outlet flue (18) and a high-temperature flue gas mixer (19);
a hole is formed in a high-temperature flue gas flue (9) at the outlet of the heating furnace (8), and an atomizing spray gun (5) is installed; a reducing agent solution regulating valve (3) and a reducing agent solution flowmeter (4) are arranged on a reducing agent solution pipeline connected with the atomizing spray gun (5); a compressed air regulating valve (6) and a compressed air flowmeter (7) are arranged on a compressed air pipeline connected with the atomizing spray gun (5); the reducing agent solution storage tank (1) is sequentially connected with a reducing agent solution delivery pump (2), a reducing agent solution regulating valve (3), a reducing agent solution flowmeter (4) and an atomizing spray gun (5) through a reducing agent solution pipeline; a high-temperature flue gas mixer (19) is arranged on the high-temperature flue (9) at the downstream of the atomizing spray gun (5); the high-temperature flue gas pipeline (9) is connected with a hot air bellow (10); the hot air bellows (10) is connected with a hot air distribution pipe (11), and the hot air distribution pipe (11) is arranged in the vertical flue (14); the denitration inlet flue (12) is connected with a vertical flue (14) through a raw flue gas side (13) of the GGH heat exchanger; the hot air distribution pipe (11) is positioned above the original flue gas side (13) of the GGH heat exchanger, and the static mixer (15) is arranged in the vertical flue (14) and positioned above the hot air distribution pipe (11); the upper end of the vertical flue (14) is connected with an SCR denitration reactor (16), and the SCR denitration reactor (16) is connected with a denitration outlet flue (18) through a GGH heat exchanger clean flue gas side (17).
2. The SCR denitration reducing agent preparation device with a flue gas heating system according to claim 1, characterized in that: denitration catalysts are arranged in the SCR reactor (16), and a soot blower is installed on the SCR reactor (16).
3. The SCR denitration reducing agent preparation device with a flue gas heating system according to claim 1, characterized in that: the atomizing spray gun (5) is arranged on the same section or a plurality of sections of the high-temperature flue gas flue (9), and the uniformity of ammonia spraying is adjusted by adjusting the depth of the atomizing spray gun (5) inserted into the high-temperature flue gas flue (9).
4. A preparation method of an SCR denitration reducing agent with a flue gas reheating system is characterized by comprising the following steps:
step one, opening a hole in a flue at the outlet of a heating furnace, and installing an atomizing spray gun;
secondly, the atomizing spray gun adopts a mode of combining direct atomization of a reducing agent solution and secondary atomization of compressed air; a reducing agent solution and a compressed air pipeline connected with the atomizing spray gun are respectively provided with a flow regulating valve and a metering device, and the atomizing effect of the reducing agent solution and the metering device is ensured by regulating the flow;
thirdly, spraying the reducing agent solution into a high-temperature flue at the outlet of the heating furnace through an atomizing spray gun, gasifying the ammonia gas in the high-temperature flue, uniformly mixing the ammonia gas with the high-temperature flue gas, and conveying the mixture and the high-temperature flue gas to a hot air bellows through a high-temperature flue gas pipeline;
fourthly, mixed gas containing ammonia gas in the hot air bellows is sent into the vertical flue through a hot air distribution pipe;
step five, enabling the raw flue gas to enter the raw flue gas side of the GGH heat exchanger from the denitration inlet flue, and enabling the raw flue gas to enter a vertical flue after heat exchange;
mixing the high-temperature flue gas containing ammonia gas fed through the hot air distribution pipe in the fourth step with the raw flue gas fed in the fifth step in the vertical flue, uniformly mixing the ammonia gas and the flue gas through the disturbance action of a static mixer and a flow guide device, and simultaneously increasing the temperature of the mixed high-temperature flue gas and the raw flue gas;
and step seven, the flue gas in the step six enters an SCR denitration reactor, enters the clean flue gas side of the GGH heat exchanger after the denitration reaction is finished in the reactor, and enters a flue gas denitration outlet flue after heat exchange.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110112309.XA CN112774436A (en) | 2021-01-27 | 2021-01-27 | Device and method for preparing SCR denitration reducing agent with flue gas heating system |
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| CN202110112309.XA CN112774436A (en) | 2021-01-27 | 2021-01-27 | Device and method for preparing SCR denitration reducing agent with flue gas heating system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113975834A (en) * | 2021-11-26 | 2022-01-28 | 安徽恒夏环保科技有限公司 | Hot-blast aqueous ammonia vaporization system for SCR denitration |
| CN114950061A (en) * | 2022-05-30 | 2022-08-30 | 北京龙源环保工程有限公司 | Oil-fired boiler tail gas ultralow emission treatment system and treatment method |
-
2021
- 2021-01-27 CN CN202110112309.XA patent/CN112774436A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113975834A (en) * | 2021-11-26 | 2022-01-28 | 安徽恒夏环保科技有限公司 | Hot-blast aqueous ammonia vaporization system for SCR denitration |
| CN114950061A (en) * | 2022-05-30 | 2022-08-30 | 北京龙源环保工程有限公司 | Oil-fired boiler tail gas ultralow emission treatment system and treatment method |
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