CN211753781U - Smoke multi-pollutant cooperative purification device - Google Patents
Smoke multi-pollutant cooperative purification device Download PDFInfo
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- CN211753781U CN211753781U CN201921889704.3U CN201921889704U CN211753781U CN 211753781 U CN211753781 U CN 211753781U CN 201921889704 U CN201921889704 U CN 201921889704U CN 211753781 U CN211753781 U CN 211753781U
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Abstract
A smoke multi-pollutant cooperative purification device comprises: a desulfurization adsorption treatment device, an SCR denitration treatment device, a CO catalytic oxidation treatment device and an ammonia spraying device; the original flue gas conveying pipeline is connected to the gas inlet of the desulfurization adsorption treatment device, the gas outlet of the desulfurization adsorption treatment device is connected to the gas inlet of the SCR denitration treatment device through the flue gas conveying pipeline after fine desulfurization, and the gas outlet of the SCR denitration treatment device is connected to the gas inlet of the CO catalytic oxidation treatment device through the denitration flue gas conveying pipeline; the ammonia spraying device is arranged in the original flue gas conveying pipeline, and the ammonia gas is connected to the ammonia spraying device through the ammonia gas conveying pipeline. The utility model provides a technical scheme through desulfurization adsorption treatment, before the flue gas carries out the denitration, with flue gas fine desulphurization, prevents that sulfur dioxide from letting the SCR catalyst be poisoned, improves SOx/NOx control's efficiency, reduces manufacturing enterprise's manufacturing cost, improves product quality.
Description
Technical Field
The utility model relates to a flue gas purification device, concretely relates to flue gas multi-pollutant is purifier in coordination belongs to sintering device technical field.
Background
For industrial flue gas, especially for flue gas of sintering machine in steel industry, the flue gas desulfurization and denitration technology is a flue gas purification technology applied to chemical industry for generating multi-nitrogen oxide and sulfur oxide. Nitrogen oxides and sulfur oxides are one of the main sources of air pollution. The simultaneous desulfurization and denitration technology for flue gas is mostly in research and industrial demonstration stages at present, but because the simultaneous desulfurization and denitration can be realized in one set of system, particularly along with the simultaneous desulfurization and denitration of NOXThe control standard is becoming more and more strict, and the desulfurization and denitrification technology is receiving increasing attention from various countries.
The sintering technology is widely applied to the production process of mineral smelting. In the prior art, the flue gas generated by sintering basically meets the emission standard of the sintering flue gas, but researches show that in the sintering process, the flue gas has low sulfur dioxide concentration and high nitrogen oxide and carbon monoxide concentration. In the desulfurization process, the desulfurization is not thorough, so that the flue gas to be denitrated contains a certain amount of sulfur dioxide, and the sulfur dioxide in the flue gas can inactivate an SCR catalyst, so that a large amount of the SCR catalyst is consumed in the denitration process, the sulfur dioxide causes the SCR catalyst to be blocked and poisoned, and the denitration efficiency is seriously influenced; the production cost of enterprises is also improved.
Therefore, the technical problem to be solved by the technical staff in the field is needed to provide a process method for the synergistic purification of multiple pollutants in flue gas, which can realize the fine desulfurization of sulfur oxides in the sintering flue gas, thereby reducing the use of SCR catalysts in the denitration process and reducing the production cost of enterprises.
SUMMERY OF THE UTILITY MODEL
Not enough to above-mentioned prior art, the utility model discloses an aim at passes through desulfurization adsorption treatment, before the flue gas carries out the denitration, with flue gas fine desulfurization, prevents that sulfur dioxide from letting the SCR catalyst be poisoned, improves SOx/NOx control's efficiency, reduces manufacturing enterprise's manufacturing cost, improves product quality. The utility model provides a flue gas multi-pollutant cooperative purification process method, which comprises the following steps: 1) spraying ammonia gas into the raw flue gas, and mixing the ammonia gas with the raw flue gas; 2) performing desulfurization adsorption treatment on the mixed gas of ammonia gas and raw flue gas to realize desulfurization and fine treatment on the raw flue gas to obtain fine-desulfurized flue gas; 3) after the fine desulfurization in the step 2), carrying out SCR denitration treatment on the flue gas to realize flue gas denitration treatment; 4) and (3) enabling the flue gas subjected to the denitration treatment in the step 3) to pass through a CO catalytic oxidation treatment device, so as to realize CO removal treatment of the flue gas. Compared with the content of sulfur dioxide in the flue gas, the sprayed ammonia is greatly excessive, so that a small amount of sulfur dioxide is removed by the excessive ammonia, and the effect of fine desulfurization removal is realized. Meanwhile, the adsorption layer is adopted to remove the reaction product (ammonium sulfate or ammonium bisulfate) of sulfur dioxide and ammonia gas in the flue gas, so that the content of sulfur dioxide in the flue gas is very low before the flue gas enters the SCR treatment system, and the denitration efficiency of the flue gas is ensured.
According to the first embodiment of the utility model, a flue gas multi-pollutant cooperative purification process is provided:
a process method for cooperatively purifying multiple pollutants in flue gas comprises the following steps:
1) spraying ammonia gas into the raw flue gas, and mixing the ammonia gas with the raw flue gas;
2) performing desulfurization adsorption treatment on the mixed gas of ammonia gas and raw flue gas to realize desulfurization and fine treatment on the raw flue gas to obtain fine-desulfurized flue gas;
3) after the fine desulfurization in the step 2), carrying out SCR denitration treatment on the flue gas to realize flue gas denitration treatment;
4) and (3) enabling the flue gas subjected to the denitration treatment in the step 3) to pass through a CO catalytic oxidation treatment device, so as to realize CO removal treatment of the flue gas.
Preferably, the method further comprises:
5) and (4) carrying out SCR denitration treatment on the flue gas subjected to CO removal treatment in the step 4) again to realize denitration fine treatment so as to obtain clean flue gas.
Preferably, the content of sulfur oxides in the raw flue gas is lower than 100mg/m3Preferably less than 80mg/m3More preferably less than 50mg/m3(ii) a After the desulfurization and fine treatment in the step 2), the content of sulfur oxides in the flue gas after fine desulfurization is lower than 10mg/m3Preferably less than 8mg/m3More preferably less than 5mg/m3。
Preferably, the raw flue gas is flue gas obtained by desulfurizing sintering flue gas; the temperature of the raw flue gas is less than 320 ℃, preferably less than 300 ℃, more preferably less than 280 ℃.
Preferably, the amount of ammonia injected in step 1) is 1 to 2 times, preferably 1.05 to 1.5 times, more preferably 1.1 to 1.2 times the total amount of ammonia required for removing sulfur oxides and nitrogen oxides from the raw flue gas.
Preferably, the step 1) of injecting ammonia gas is specifically as follows: mixing ammonia gas and a heat medium, spraying the mixture into the original flue gas, and mixing the mixed gas of the ammonia gas and the heat medium with the original flue gas.
Preferably, the heat medium is hot air or the clean flue gas obtained in step 5).
Preferably, the heat exchangers are arranged on the raw flue gas conveying pipeline and the clean flue gas conveying pipeline, the raw flue gas is subjected to heat exchange and temperature rise through the heat exchangers and then is treated in the step 1), and the clean flue gas is subjected to heat exchange and temperature reduction through the heat exchangers and then is discharged or mixed with ammonia gas.
Preferably, the heat exchanger is a GGH heat exchanger.
Preferably, the method further comprises:
6) detecting the concentration of sulfur oxides in the original flue gas, and marking the concentration as CSulfur oxidesAnd (c); detecting the concentration of nitrogen oxides in the raw flue gas, marked as CNitrogen oxidesAnd (c); detecting the concentration of ammonia in the emission of clean flue gas, marked CAmmonia slipAnd (c); detecting the flow of the original smokeIs recorded as QFlue gas(ii) a The injection amount of the ammonia gas in the step 1) is
Wherein: a is the reaction coefficient of sulfur dioxide consuming ammonia in the flue gas, the value of a is 0.4-1.5, preferably the value of a is 0.5-1.2, and more preferably the value of a is 0.6-1; b is the reaction coefficient of nitrogen oxide in the flue gas for consuming ammonia, and the value of b is 0.5-2; preferably, b has a value of 0.6 to 1.5; more preferably, b has a value of 0.7 to 1.2.
According to the utility model discloses a second kind of embodiment provides a flue gas multi-pollutant is purifier in coordination:
a smoke multi-pollutant cooperative purification device comprises: a desulfurization adsorption treatment device, an SCR denitration treatment device, a CO catalytic oxidation treatment device and an ammonia spraying device; the original flue gas conveying pipeline is connected to the gas inlet of the desulfurization adsorption treatment device, the gas outlet of the desulfurization adsorption treatment device is connected to the gas inlet of the SCR denitration treatment device through the flue gas conveying pipeline after fine desulfurization, and the gas outlet of the SCR denitration treatment device is connected to the gas inlet of the CO catalytic oxidation treatment device through the denitration flue gas conveying pipeline; the ammonia spraying device is arranged in the original flue gas conveying pipeline, and the ammonia gas is connected to the ammonia spraying device through the ammonia gas conveying pipeline.
Preferably, the apparatus further comprises a second SCR denitration treatment apparatus; the exhaust port of the CO catalytic oxidation treatment device is connected to the air inlet of the second SCR denitration treatment device through a CO-removal flue gas conveying pipeline, and the exhaust port of the second SCR denitration treatment device is connected with a clean flue gas conveying pipeline.
Preferably, the device also comprises an ammonia mixer, the ammonia conveying pipeline and the heat medium conveying pipeline are connected to the air inlet of the ammonia mixer, and the air outlet of the ammonia mixer is connected to the ammonia spraying device through the ammonia and heat medium mixed gas conveying pipeline.
Preferably, the device also comprises a heat exchanger, the heat exchanger is respectively connected with the raw flue gas conveying pipeline and the clean flue gas conveying pipeline, and the connection position of the heat exchanger and the raw flue gas conveying pipeline is positioned at the upstream of the ammonia injection device.
Preferably, the clean flue gas supply line is connected upstream of the heat medium supply line.
Preferably, a desulfurization adsorption layer or a molecular sieve is arranged in the desulfurization adsorption treatment device; the desulfurization adsorption layer or the molecular sieve is calcium oxide and/or activated carbon.
Preferably, the heat exchanger is a GGH heat exchanger.
Preferably, the raw flue gas conveying pipeline is provided with: a flue gas flow monitoring sensor, a sulfur oxide concentration monitoring sensor and a nitrogen oxide concentration monitoring sensor; an ammonia gas flow monitoring sensor is arranged on the ammonia gas conveying pipeline; an ammonia gas concentration detection device is arranged on the clean flue gas conveying pipeline; the flue gas flow monitoring sensor detects the flow of the original flue gas and is marked as QFlue gas(ii) a The sulfur oxide concentration monitoring sensor detects the concentration of the sulfur oxide in the original flue gas and is marked as CSulfur oxidesAnd (c); the nitrogen oxide concentration monitoring sensor detects the concentration of nitrogen oxide in the original smoke and is marked as CNitrogen oxidesAnd (c); the ammonia concentration detection device detects the concentration of ammonia in the emission of the purified flue gas and is marked as CAmmonia slip，％；
By calculating:
wherein: a is the reaction coefficient of sulfur dioxide consuming ammonia in the flue gas, the value of a is 0.4-1.5, preferably the value of a is 0.5-1.2, and more preferably the value of a is 0.6-1; b is the reaction coefficient of nitrogen oxide in the flue gas for consuming ammonia, and the value of b is 0.5-2; preferably, b has a value of 0.6 to 1.5; more preferably, b has a value of 0.7 to 1.2; the reading of the ammonia gas flow monitoring sensor is controlled to be
The utility model discloses the people discovers through the research, and the desorption of nitrogen oxide in the flue gas is seriously influenced to the existence of sulfur oxide (for example sulfur dioxide) in the flue gas. In the prior art, the content of sulfur oxides in flue gas generated by partial processes is low, but the content of nitrogen oxides is high; the content of sulfur oxides in the flue gas meets the emission standard, and the flue gas can reach the emission standard only by denitration treatment. However, utility model people find in engineering practice that the denitration efficiency of this type of flue gas is lower. Researches find that the main factor influencing the denitration efficiency of the flue gas is the existence of sulfur oxides in the flue gas, and the sulfur oxides seriously influence the removal of nitrogen oxides in the flue gas.
The reaction equation of ammonia and sulfur dioxide is as follows:
2NH3+SO2+2H2O＝(NH4)2SO3
the technical scheme of the utility model, to the flue gas that oxysulfide content is low, nitrogen oxide content is high, provided a multiple pollutants purification treatment's in coordination process. Excessive ammonia gas (compared with the content of sulfur oxides in flue gas) is sprayed into the raw flue gas, then the mode of adsorption treatment is adopted, the content of sulfur oxides in flue gas is greatly reduced through desulfurization fine treatment, and then denitration treatment is carried out. Through the technical scheme of this application, because the content of sulfur oxide is lower in former flue gas itself, through spouting into a large amount of ammonia, utilize the sulfur oxide of low concentration in the ammonia desorption flue gas of high concentration, then handle through the desulfurization adsorbed layer, the sulfur oxide is present in the adsorbed layer with ammonium bisulfate or ammonium sulfate, and the flue gas can the fine desulfurization, and the content of sulfur oxide further reduces in the flue gas after the fine desulfurization to the denitration efficiency of flue gas has been guaranteed.
The required amount of ammonia gas
In order to realize the purpose,
q is obtained by detectionFlue gas、CSulfur oxides、CNitrogen oxidesAnd CAmmonia slipThe required excessive ammonia gas amount can be obtained by calculating according to the formula
In addition, among the technical scheme of this application, if the content of sulfur oxide is higher in former flue gas, spout into a large amount of ammonia, will cause a large amount of escapes of ammonia, influence the desulfurization effect of itself moreover, will also influence subsequent denitration efficiency. Therefore, the technical scheme of the application is particularly suitable for low content (lower than 100 mg/m) of sulfur oxides3Preferably less than 80mg/m3More preferably less than 50mg/m3) The content of nitrogen oxides is higher (generally between 100 mg/m)3～1000mg/m3) The flue gas of (1).
According to the technical scheme, aiming at the flue gas with low content of oxysulfide, firstly, a large amount of ammonia gas is sprayed into the original flue gas, and then the flue gas is subjected to desulfurization and fine treatment through an adsorption layer; and then carrying out denitration treatment. Greatly reduces the temperature of denitration treatment and improves the efficiency of denitration treatment. By adopting the technical scheme, the denitration treatment temperature is 150-220 ℃; the content of nitrogen oxides in the flue gas after denitration treatment is lower than 30mg/m3。
In addition, through research, a small amount of sulfur oxide can also cause rapid inactivation of the CO catalytic oxidant; the content of sulfur oxides in the flue gas is high, and the removal effect of CO in the flue gas is seriously influenced. The technical proposal of the utility model is that the sulfur oxide in the flue gas is finely processed, and the content of the sulfur oxide in the flue gas is controlled to be lower than 10mg/m3(preferably less than 8 mg/m)3More preferably less than 5mg/m3) The influence of sulfur oxides in the flue gas on the CO catalytic oxidant is avoided.
The utility model discloses an at first carry out the technical scheme of desulfurization fine treatment to the flue gas, avoided the influence of sulfur oxide in whole denitration decarbonization process to guarantee the denitration decarbonization efficiency of flue gas, reduced the content of pollutant among the exhaust gas, alleviateed the cost that the flue gas was handled greatly. Researches show that the denitration efficiency of the flue gas is seriously influenced due to the existence of sulfur dioxide in the flue gas. The higher the sulfur dioxide content in the flue gas is, the lower the SCR denitration rate is, and the easier the SCR catalyst is poisoned. On the contrary, the lower the sulfur dioxide content in the flue gas, the higher the SCR denitration rate, and the more stable the SCR catalyst. If sulfur dioxide content is higher in the flue gas, at the denitration in-process, sulfur dioxide and ammonia reaction in the flue gas generate a large amount of ammonium sulfate or ammonium bisulfate, and ammonium sulfate or ammonium bisulfate very easily block up the reaction channel of SCR catalyst, therefore, before carrying out the SCR denitration, sulfur dioxide's content in the flue gas as far as possible reduces, will be favorable to subsequent denitration process greatly.
In addition, studies have found that the CO catalytic oxidant is a more sensitive catalyst, and a small amount of sulfur dioxide can cause rapid deactivation of the CO catalyst. Experiments show that the content of sulfur dioxide in the flue gas is more than 10mg/m3In time, the CO catalytic oxidizer is more affected. The utility model discloses a processing of adsorbed layer to the flue gas, sulfur dioxide's content is less than 10mg/m in the flue gas before control entering SCR reactor3Thereby ensuring the safety of the CO catalytic oxidant and further ensuring the decarbonization effect on the flue gas.
The utility model discloses the flue gas that technical scheme handled can spout excessive ammonia (compare in the content of oxysulfide in the flue gas) according to the technology needs because oxysulfide content itself is lower, realizes the desulfurization fine processing of oxysulfide in the flue gas. Preferably, the injected ammonia gas can be mixed with the heat medium and then the raw flue gas, so that the reaction efficiency of the flue gas and the sulfur oxides in the raw flue gas is improved, and the removal effect of the sulfur oxides in the flue gas is ensured. Further preferably, the heat medium adopts the completely processed clean flue gas, and the heat in the clean flue gas is utilized to realize the comprehensive utilization of resources.
The utility model discloses in, be equipped with the heat exchanger on former flue gas pipeline and clean flue gas pipeline, heat in the flue gas after the make full use of denitration treatment because the denitration reaction is an exothermic reaction, the temperature of flue gas is higher after the denitration treatment, utilizes this part heat for the temperature of flue gas before the heating denitration, the effect of flue gas fine desulfurization, denitration treatment has further been guaranteed.
The utility model discloses in, will be through taking off the flue gas after CO handles again through SCR denitration treatment, the nitrogen oxide in the further desorption flue gas realizes the denitration fine processing, obtains clean flue gas.
In the utility model, the concentration of the oxynitride in the original flue gas, the concentration of the ammonia gas in the emission of the clean flue gas and the flow of the original flue gas are detected by accurately detecting the concentration of the oxynitride in the original flue gas; the ammonia amount sprayed into the original flue gas can be accurately controlled, so that the effects of desulfurization fine treatment and denitration treatment are ensured, the escape of ammonia gas is reduced, the occurrence of dangerous accidents is avoided, and the pollution to the environment is also reduced.
In the second scheme of the application, a desulfurization adsorption treatment device, an SCR denitration treatment device and a CO catalytic oxidation treatment device are communicated in sequence; the ammonia spraying device sprays ammonia gas into the raw flue gas conveying pipeline to obtain mixed gas of the ammonia gas and the raw flue gas; and then the raw flue gas conveying pipeline guides the mixed gas of the ammonia gas and the raw flue gas into an air inlet of the desulfurization adsorption treatment device for fine desulfurization treatment. Enabling the flue gas subjected to fine desulfurization treatment to enter an SCR denitration treatment device for denitration treatment; and (4) enabling the flue gas after the fine denitration treatment to enter a CO catalytic oxidation treatment device for CO removal treatment. Through the many pollutants of flue gas purifier in coordination that this application provided, can be in order deviate from oxysulfide, nitrogen oxide and oxycarbide in the sintering flue gas, and handle the oxysulfide of low concentration through letting in excessive ammonia, ensure to deviate from the oxysulfide totally, prevent to cause the SCR catalyst to be poisoned. The device has improved the efficiency of desulfurization, denitration and decarbonization effectively, has reduced the manufacturing cost of enterprise.
In the second scheme of the application, the flue gas treated by the CO catalytic oxidation treatment device is introduced into a second SCR denitration treatment device. And the second SCR denitration treatment device is used for treating residual nitrogen oxides in the flue gas and finally discharging the flue gas through the clean flue gas conveying pipeline. Improve the utility model discloses a denitration efficiency.
In the second scheme of the application, the ammonia-containing gas sprayed by the ammonia spraying device is from an ammonia mixer. High-purity ammonia gas is mixed into a heat medium (the heat medium is preferably hot air) through an ammonia gas mixer to form mixed gas of the ammonia gas and the heat medium. And is connected with an ammonia spraying device through an ammonia gas and heat medium mixed gas conveying pipeline.
In the mixed gas of ammonia and the heat medium, the concentration of ammonia is safe, and the ammonia can be effectively prevented from exploding. The temperature of the mixed gas of the ammonia gas and the thermal medium is basically consistent with that of the sintering flue gas through mixing, so that the ammonia gas can be prevented from suddenly entering a high-temperature environment to explode, or the sintering flue gas is prevented from condensing when encountering cold ammonia gas. The high-acidity sulfide liquid is generated after the sintering flue gas is condensed, and the flue gas pipeline is corroded.
In the second scheme of this application, through the heat exchanger with the heat conversion of the gas in the clean flue gas pipeline to in the former flue gas pipeline to the heat that produces among the recovery utilization SCR denitration treatment device.
In the second scheme of the application, the gas of the clean flue gas conveying pipeline is introduced into the heat medium conveying pipeline again to be mixed with the ammonia gas. Reducing the heat generation energy consumption of the produced gas.
In the second scheme of the application, calcium oxide or active carbon is arranged in the desulfurization adsorption treatment device, so that elemental sulfur in the flue gas can be effectively removed.
In the second scheme of this application, through the flow that detects former flue gas, the content of oxysulfide and nitrogen oxide, the injected amount of control ammonia that can be accurate.
The utility model discloses in, through setting up the adsorbed layer, can also detach the dust granule in the flue gas through the adsorbed layer. That is, the adsorption layer also functions as a dust removing means. The dust content in the flue gas is further reduced by the arrangement of the adsorption layer, so that the influence of dust on the SCR catalyst and the CO catalytic oxidizer is avoided, the phenomenon that the SCR catalyst and the CO catalytic oxidizer are blocked by dust is avoided, and the denitration and decarburization effects on the flue gas are further ensured.
In the present invention, the height of the desulfurization adsorption treatment device is 1 to 50m, preferably 2 to 30m, and more preferably 3 to 20 m.
In the present invention, the height of the SCR denitration treatment apparatus is 1 to 50m, preferably 2 to 30m, and more preferably 3 to 20 m.
In the present invention, the height of the CO catalytic oxidation treatment apparatus is 1 to 50m, preferably 2 to 30m, and more preferably 3 to 20 m.
In the utility model, the ammonia spraying device is an ammonia gas atomizer.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the technical scheme provided by the application can improve the desulfurization rate of the sintering flue gas, prevent the SCR catalyst from being deactivated, and greatly reduce the production cost of enterprises;
2. the application provides a technical scheme can realize smart denitration, improves denitration decarbonization rate, reduces the cost of enterprises.
Drawings
FIG. 1 is a schematic flow chart of an ammonia injection fine desulfurization process according to an embodiment of the present invention;
FIG. 2 is a schematic view of the overall process of the flue gas multi-pollutant cooperative purification process in the embodiment of the present invention;
FIG. 3 is a schematic view of the connection structure of the smoke multi-pollutant cooperative purification device in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a second SCR denitration treatment device provided in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a heat exchanger provided in an embodiment of the present invention;
fig. 6 is a schematic structural diagram of the second SCR denitration treatment device and the heat exchanger provided in the embodiment of the present invention.
Reference numerals:
1: a desulfurization adsorption treatment device; 2: an SCR denitration treatment device; 3: a CO catalytic oxidation treatment device; 4: an ammonia injection device; 5: a second SCR denitration treatment device; 6: an ammonia mixer; 7: a heat exchanger;
l1: an original flue gas conveying pipeline; l4: an ammonia gas delivery line; l5: a CO flue gas conveying pipeline; l6: a clean flue gas delivery duct; l7: a thermal medium delivery conduit; l8: a heat medium mixed gas delivery pipe;
q1: a flue gas flow monitoring sensor; c1: a sulfur oxide concentration monitoring sensor; c2: a nitrogen oxide concentration monitoring sensor; q3: an ammonia gas flow monitoring sensor; c3: ammonia concentration detection device.
Detailed Description
According to the first embodiment of the utility model, a flue gas multi-pollutant cooperative purification process is provided:
a process method for cooperatively purifying multiple pollutants in flue gas comprises the following steps:
1) and (3) spraying ammonia gas into the raw flue gas, wherein the ammonia gas is mixed with the raw flue gas.
2) And (3) carrying out desulfurization adsorption treatment on the mixed gas of the ammonia gas and the raw flue gas to realize desulfurization and fine treatment on the raw flue gas so as to obtain the flue gas subjected to fine desulfurization.
3) And (3) carrying out SCR denitration treatment on the flue gas subjected to the fine desulfurization in the step 2) to realize flue gas denitration treatment.
4) And (3) enabling the flue gas subjected to the denitration treatment in the step 3) to pass through a CO catalytic oxidation treatment device, so as to realize CO removal treatment of the flue gas.
Preferably, the method further comprises:
5) and (4) carrying out SCR denitration treatment on the flue gas subjected to CO removal treatment in the step 4) again to realize denitration fine treatment so as to obtain clean flue gas.
Preferably, the content of sulfur oxides in the raw flue gas is lower than 100mg/m3Preferably less than 80mg/m3More preferably less than 50mg/m3. After the desulfurization and fine treatment in the step 2), the content of sulfur oxides in the flue gas after fine desulfurization is lower than 10mg/m3Preferably less than 8mg/m3More preferably less than 5mg/m3。
Preferably, the raw flue gas is flue gas obtained by desulfurizing sintering flue gas. The temperature of the raw flue gas is less than 320 ℃, preferably less than 300 ℃, more preferably less than 280 ℃.
Preferably, the amount of ammonia injected in step 1) is 1 to 2 times, preferably 1.05 to 1.5 times, more preferably 1.1 to 1.2 times the total amount of ammonia required for removing sulfur oxides and nitrogen oxides from the raw flue gas.
Preferably, the step 1) of injecting ammonia gas is specifically as follows: mixing ammonia gas and a heat medium, spraying the mixture into the original flue gas, and mixing the mixed gas of the ammonia gas and the heat medium with the original flue gas.
Preferably, the heat medium is hot air or the clean flue gas obtained in step 5).
Preferably, the heat exchangers are arranged on the raw flue gas conveying pipeline and the clean flue gas conveying pipeline, the raw flue gas is subjected to heat exchange and temperature rise through the heat exchangers and then is treated in the step 1), and the clean flue gas is subjected to heat exchange and temperature reduction through the heat exchangers and then is discharged or mixed with ammonia gas.
Preferably, the heat exchanger is a GGH heat exchanger.
Preferably, the method further comprises:
6) detecting the concentration of sulfur oxides in the original flue gas, and marking the concentration as CSulfur oxides% of the amount of the compound (b). Detecting the concentration of nitrogen oxides in the raw flue gas, marked as CNitrogen oxides% of the amount of the compound (b). Detecting the concentration of ammonia in the emission of clean flue gas, marked CAmmonia slip% of the amount of the compound (b). Detecting the flow of raw flue gas, marked as QFlue gas. The injection amount of the ammonia gas in the step 1) is
Wherein: a is the reaction coefficient of sulfur dioxide consuming ammonia in the flue gas, and the value of a is 0.4-1.5, preferably the value of a is 0.5-1.2, and more preferably the value of a is 0.6-1. b is the reaction coefficient of nitrogen oxide in the flue gas to consume ammonia, and the value of b is 0.5-2. Preferably, b has a value of 0.6 to 1.5. More preferably, b has a value of 0.7 to 1.2.
According to the utility model discloses a second kind of embodiment provides a flue gas multi-pollutant is purifier in coordination:
a smoke multi-pollutant cooperative purification device comprises: the device comprises a desulfurization adsorption treatment device (1), an SCR denitration treatment device (2), a CO catalytic oxidation treatment device (3) and an ammonia spraying device (4). Former flue gas pipeline (L1) is connected to the air inlet of desulfurization adsorption treatment device (1), and the flue gas pipeline is connected to the air inlet of SCR denitration treatment device (2) after the fine desulfurization in the gas outlet of desulfurization adsorption treatment device (1), and the gas outlet of SCR denitration treatment device (2) is connected to the air inlet of CO catalytic oxidation treatment device (3) through denitration flue gas pipeline. The ammonia injection device (4) is arranged in the raw flue gas conveying pipeline (L1), and the ammonia gas is connected to the ammonia injection device (4) through the ammonia gas conveying pipeline (L4).
Preferably, the apparatus further comprises a second SCR denitration treatment apparatus (5). An exhaust port of the CO catalytic oxidation treatment device (3) is connected to an air inlet of the second SCR denitration treatment device (5) through a CO-removal flue gas conveying pipeline (L5), and an exhaust port of the second SCR denitration treatment device (5) is connected with a clean flue gas conveying pipeline (L6).
Preferably, the device also comprises an ammonia gas mixer (6), wherein an ammonia gas conveying pipeline (L4) and a heat medium conveying pipeline (L7) are connected to the gas inlet of the ammonia gas mixer (6), and the gas outlet of the ammonia gas mixer (6) is connected to the ammonia spraying device (4) through an ammonia gas and heat medium mixed gas conveying pipeline (L8).
Preferably, the device also comprises a heat exchanger (7), the heat exchanger (7) is respectively connected with the raw flue gas conveying pipeline (L1) and the clean flue gas conveying pipeline (L6), and the connection position of the heat exchanger (7) and the raw flue gas conveying pipeline (L1) is positioned at the upstream of the ammonia spraying device (4).
Preferably, a clean flue gas duct (L6) is connected upstream of the heat medium duct (L7).
Preferably, a desulfurization adsorption layer or a molecular sieve is arranged in the desulfurization adsorption treatment device (1). The desulfurization adsorption layer or the molecular sieve is calcium oxide and/or activated carbon.
Preferably, the heat exchanger (7) is a GGH heat exchanger.
Preferably, the raw flue gas duct (L1) is provided with: a flue gas flow monitoring sensor (Q1), a sulfur oxide concentration monitoring sensor (C1) and a nitrogen oxide concentration monitoring sensor (C2). An ammonia gas flow monitoring sensor (Q3) is arranged on the ammonia gas conveying pipeline (L4). An ammonia gas concentration detection device (C3) is arranged on the clean flue gas conveying pipeline (L6). A flue gas flow monitoring sensor (Q1) detects the flow of raw flue gas, marked as QFlue gas. A sulfur oxide concentration monitoring sensor (C1) detects the concentration of sulfur oxides in the raw flue gas, labeled CSulfur oxides% of the amount of the compound (b). The nitrogen oxide concentration monitoring sensor (C2) detects the concentration of nitrogen oxide in the raw smoke and is marked as CNitrogen oxides% of the amount of the compound (b). An ammonia gas concentration detecting means (C3) for detecting the concentration of ammonia gas in the purified exhaust gas, denoted by CAmmonia slip，％。
By calculating:
wherein: a is the reaction coefficient of sulfur dioxide consuming ammonia in the flue gas, and the value of a is 0.4-1.5, preferably the value of a is 0.5-1.2, and more preferably the value of a is 0.6-1. b is the reaction coefficient of nitrogen oxide in the flue gas to consume ammonia, and the value of b is 0.5-2. Preferably, b has a value of 0.6 to 1.5. More preferably, b has a value of 0.7 to 1.2. The ammonia gas flow rate monitoring sensor (Q3) is controlled to read as
Example 1
A process method for cooperatively purifying multiple pollutants in flue gas comprises the following steps:
1) and (3) spraying ammonia gas into the raw flue gas, wherein the ammonia gas is mixed with the raw flue gas.
2) And (3) carrying out desulfurization adsorption treatment on the mixed gas of the ammonia gas and the raw flue gas to realize desulfurization and fine treatment on the raw flue gas so as to obtain the flue gas subjected to fine desulfurization.
3) And (3) carrying out SCR denitration treatment on the flue gas subjected to the fine desulfurization in the step 2) to realize flue gas denitration treatment.
4) And (3) enabling the flue gas subjected to the denitration treatment in the step 3) to pass through a CO catalytic oxidation treatment device, so as to realize CO removal treatment of the flue gas.
Example 2
Example 1 is repeated except that the method further comprises:
5) and (4) carrying out SCR denitration treatment on the flue gas subjected to CO removal treatment in the step 4) again to realize denitration fine treatment so as to obtain clean flue gas.
Example 3
Example 2 was repeated, except that the content of sulphur oxides in the raw flue gas was less than 100mg/m3. After the desulfurization and fine treatment in the step 2), the content of sulfur oxides in the flue gas after fine desulfurization is lower than 5mg/m3. The raw flue gas is flue gas obtained by desulfurizing sintering flue gas. The temperature of the original smoke is lower than 280 ℃. The injection amount of the ammonia gas in the step 1) is 1.2 times of the total amount of the ammonia gas required for removing sulfur oxides and nitrogen oxides in the raw flue gas.
Example 4
Example 3 was repeated, except that the ammonia injection described in step 1) was specifically: mixing ammonia gas and a heat medium, spraying the mixture into the original flue gas, and mixing the mixed gas of the ammonia gas and the heat medium with the original flue gas. The heat medium is hot air or the clean smoke obtained in the step 5).
Example 5
Example 4 is repeated, except that the heat exchangers are arranged on the raw flue gas conveying pipeline and the clean flue gas conveying pipeline, the raw flue gas is subjected to heat exchange and temperature rise by the heat exchangers and then is treated in the step 1), and the clean flue gas is subjected to heat exchange and temperature reduction by the heat exchangers and then is discharged or mixed with ammonia gas. The heat exchanger is a GGH heat exchanger.
Example 6
Example 5 was repeated except that the method further included:
6) detecting the concentration of sulfur oxides in the original flue gas, and marking the concentration as CSulfur oxides% of the amount of the compound (b). Detecting the concentration of nitrogen oxides in the raw flue gas, marked as CNitrogen oxides% of the amount of the compound (b). Detecting the concentration of ammonia in the emission of clean flue gas, marked CAmmonia slip% of the amount of the compound (b). Detecting the flow of raw flue gas, marked as QFlue gas. The injection amount of the ammonia gas in the step 1) is
Wherein: a is the reaction coefficient of sulfur dioxide in the flue gas to consume ammonia, and the value of a is 0.8. b is the reaction coefficient of nitrogen oxides in the flue gas for consuming ammonia, and the value of b is 1.1.
Example 7
A smoke multi-pollutant cooperative purification device comprises: the device comprises a desulfurization adsorption treatment device (1), an SCR denitration treatment device (2), a CO catalytic oxidation treatment device (3) and an ammonia spraying device (4). Former flue gas pipeline (L1) is connected to the air inlet of desulfurization adsorption treatment device (1), and the flue gas pipeline is connected to the air inlet of SCR denitration treatment device (2) after the fine desulfurization in the gas outlet of desulfurization adsorption treatment device (1), and the gas outlet of SCR denitration treatment device (2) is connected to the air inlet of CO catalytic oxidation treatment device (3) through denitration flue gas pipeline. The ammonia injection device (4) is arranged in the raw flue gas conveying pipeline (L1), and the ammonia gas is connected to the ammonia injection device (4) through the ammonia gas conveying pipeline (L4).
Example 8
Example 7 was repeated except that the apparatus further included a second SCR denitration treatment apparatus (5). An exhaust port of the CO catalytic oxidation treatment device (3) is connected to an air inlet of the second SCR denitration treatment device (5) through a CO-removal flue gas conveying pipeline (L5), and an exhaust port of the second SCR denitration treatment device (5) is connected with a clean flue gas conveying pipeline (L6).
Example 9
Example 8 was repeated except that the apparatus further included an ammonia gas mixer (6), an ammonia gas supply line (L4) and a heat medium supply line (L7) were connected to the gas inlet of the ammonia gas mixer (6), and the gas outlet of the ammonia gas mixer (6) was connected to the ammonia spraying apparatus (4) through an ammonia gas and heat medium mixed gas supply line (L8).
Example 10
Example 9 was repeated except that the apparatus further included a heat exchanger (7), the heat exchanger (7) was connected to the raw flue gas feed line (L1) and the clean flue gas feed line (L6), respectively, and the connection of the heat exchanger (7) to the raw flue gas feed line (L1) was located upstream of the ammonia injection apparatus (4). The upstream of the heat medium conveying pipeline (L7) is connected with a clean smoke conveying pipeline (L6).
Example 11
Example 10 was repeated except that the desulfurization adsorption treatment apparatus (1) was provided with a desulfurization adsorption layer or a molecular sieve. The desulfurization adsorption layer or the molecular sieve is calcium oxide and/or activated carbon. The heat exchanger (7) is a GGH heat exchanger.
Example 12
Example 11 was repeated except that the raw flue gas duct (L1) was provided with: a flue gas flow monitoring sensor (Q1), a sulfur oxide concentration monitoring sensor (C1) and a nitrogen oxide concentration monitoring sensor (C2). An ammonia gas flow monitoring sensor (Q3) is arranged on the ammonia gas conveying pipeline (L4). An ammonia gas concentration detection device (C3) is arranged on the clean flue gas conveying pipeline (L6). A flue gas flow monitoring sensor (Q1) detects the flow of raw flue gas, marked as QFlue gas. A sulfur oxide concentration monitoring sensor (C1) detects the concentration of sulfur oxides in the raw flue gas, labeled CSulfur oxides% of the amount of the compound (b). The nitrogen oxide concentration monitoring sensor (C2) detects the concentration of nitrogen oxide in the raw smoke and is marked as CNitrogen oxides% of the amount of the compound (b). An ammonia gas concentration detecting means (C3) for detecting the concentration of ammonia gas in the purified exhaust gas, denoted by CAmmonia slip，％。
By calculating:
wherein: a is the reaction coefficient of sulfur dioxide in the flue gas to consume ammonia, and the value of a is 0.8. b is the reaction coefficient of nitrogen oxides in the flue gas for consuming ammonia, and the value of b is 1.1. The ammonia gas flow rate monitoring sensor (Q3) is controlled to read as
Experiments were performed according to the examples:
the method comprises the following steps of quantitatively obtaining simulated smoke containing different substance concentrations, wherein the simulated smoke comprises: sulfur dioxide, nitrogen oxides and carbon monoxide. Detecting NO under the conditions of fine desulfurization treatment and NO fine desulfurization treatment under the condition of applying sufficient ammonia gas to different simulated flue gasXAnd CO removal efficiency.
NOXExperimental comparison data for removal are as follows:
note:
experiments show that by adopting the technical scheme of the application, before SCR denitration treatment, the adsorption layer is arranged, so that fine desulfurization treatment of flue gas is realized, and the denitration rate of SCR is greatly improved; meanwhile, the denitration effect of the SCR can be ensured under the condition of relatively low temperature, so that the denitration reaction temperature can be reduced, and the denitration cost is greatly reduced.
Experimental comparison data for CO removal are as follows:
note:
from experimental data it can be derived: after ammonia gas is introduced in advance and sulfur dioxide in the flue gas is removed through a fine desulfurization process, the poisoning of a CO catalytic oxidizing agent can be prevented, and the concentration of CO in the sintering flue gas entering a CO catalytic oxidation device is relatively increased, so that the decarburization efficiency of the CO catalytic oxidation device is improved; on the premise of adopting a low-temperature CO catalytic oxidant, higher decarburization efficiency can be realized in a low-temperature environment.
Claims (12)
1. The utility model provides a flue gas multi-pollutant is purifier in coordination which characterized in that: the device includes: a desulfurization adsorption treatment device (1), an SCR denitration treatment device (2), a CO catalytic oxidation treatment device (3) and an ammonia spraying device (4); an original flue gas conveying pipeline (L1) is connected to a gas inlet of the desulfurization adsorption treatment device (1), a gas outlet of the desulfurization adsorption treatment device (1) is connected to a gas inlet of the SCR denitration treatment device (2) through a flue gas conveying pipeline after fine desulfurization, and a gas outlet of the SCR denitration treatment device (2) is connected to a gas inlet of the CO catalytic oxidation treatment device (3) through a denitration flue gas conveying pipeline; the ammonia spraying device (4) is arranged in the raw flue gas conveying pipeline (L1), and the ammonia gas is connected to the ammonia spraying device (4) through the ammonia gas conveying pipeline (L4); wherein: the height of the desulfurization adsorption treatment device (1) is 1-50 m.
2. The apparatus of claim 1, wherein: the device also comprises a second SCR denitration treatment device (5); an exhaust port of the CO catalytic oxidation treatment device (3) is connected to an air inlet of the second SCR denitration treatment device (5) through a CO-removal flue gas conveying pipeline (L5), and an exhaust port of the second SCR denitration treatment device (5) is connected with a clean flue gas conveying pipeline (L6).
3. The apparatus of claim 2, wherein: the device also comprises an ammonia mixer (6), wherein an ammonia gas conveying pipeline (L4) and a heat medium conveying pipeline (L7) are connected to the air inlet of the ammonia mixer (6), and the air outlet of the ammonia mixer (6) is connected to the ammonia spraying device (4) through an ammonia gas and heat medium mixed gas conveying pipeline (L8).
4. The apparatus of claim 2 or 3, wherein: the device also comprises a heat exchanger (7), wherein the heat exchanger (7) is respectively connected with the raw flue gas conveying pipeline (L1) and the clean flue gas conveying pipeline (L6), and the connection position of the heat exchanger (7) and the raw flue gas conveying pipeline (L1) is positioned at the upstream of the ammonia spraying device (4).
5. The apparatus of claim 3, wherein: the upstream of the heat medium conveying pipeline (L7) is connected with a clean smoke conveying pipeline (L6).
6. The apparatus of claim 4, wherein: the upstream of the heat medium conveying pipeline (L7) is connected with a clean smoke conveying pipeline (L6).
7. The apparatus of any one of claims 1-3, 5-6, wherein: a desulfurization adsorption layer or a molecular sieve is arranged in the desulfurization adsorption treatment device (1); the desulfurization adsorption layer or the molecular sieve is a calcium oxide layer and/or an activated carbon layer.
8. The apparatus of claim 4, wherein: a desulfurization adsorption layer or a molecular sieve is arranged in the desulfurization adsorption treatment device (1); the desulfurization adsorption layer or the molecular sieve is a calcium oxide layer and/or an activated carbon layer.
9. The apparatus of claim 4, wherein: the heat exchanger (7) is a GGH heat exchanger.
10. The apparatus of claim 6, wherein: the heat exchanger (7) is a GGH heat exchanger.
11. The apparatus of any one of claims 2-3, 5-6, 8-10, wherein: the original flue gas conveying pipeline (L1) is provided with: a flue gas flow monitoring sensor (Q1), a sulfur oxide concentration monitoring sensor (C1) and a nitrogen oxide concentration monitoring sensor (C2); an ammonia gas flow monitoring sensor (Q3) is arranged on the ammonia gas conveying pipeline (L4); an ammonia gas concentration detection device (C3) is arranged on the clean flue gas conveying pipeline (L6); a flue gas flow monitoring sensor (Q1) detects the flow of raw flue gas, marked as QFlue gas(ii) a A sulfur oxide concentration monitoring sensor (C1) detects the concentration of sulfur oxides in the raw flue gas, labeled CSulfur oxidesAnd (c); the nitrogen oxide concentration monitoring sensor (C2) detects the concentration of nitrogen oxide in the raw smoke and is marked as CNitrogen oxidesAnd (c); an ammonia gas concentration detecting means (C3) for detecting the concentration of ammonia gas in the purified exhaust gas, denoted by CAmmonia slip，％。
12. The apparatus of claim 4, wherein: the original flue gas conveying pipeline (L1) is provided with: a flue gas flow monitoring sensor (Q1), a sulfur oxide concentration monitoring sensor (C1) and a nitrogen oxide concentration monitoring sensor (C2); ammonia gas transportationAn ammonia gas flow monitoring sensor (Q3) is arranged on the delivery pipeline (L4); an ammonia gas concentration detection device (C3) is arranged on the clean flue gas conveying pipeline (L6); a flue gas flow monitoring sensor (Q1) detects the flow of raw flue gas, marked as QFlue gas(ii) a A sulfur oxide concentration monitoring sensor (C1) detects the concentration of sulfur oxides in the raw flue gas, labeled CSulfur oxidesAnd (c); the nitrogen oxide concentration monitoring sensor (C2) detects the concentration of nitrogen oxide in the raw smoke and is marked as CNitrogen oxidesAnd (c); an ammonia gas concentration detecting means (C3) for detecting the concentration of ammonia gas in the purified exhaust gas, denoted by CAmmonia slip，％。
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