CN111715022A - Coal-fired flue gas purification method and system applying same - Google Patents
Coal-fired flue gas purification method and system applying same Download PDFInfo
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- CN111715022A CN111715022A CN202010525025.9A CN202010525025A CN111715022A CN 111715022 A CN111715022 A CN 111715022A CN 202010525025 A CN202010525025 A CN 202010525025A CN 111715022 A CN111715022 A CN 111715022A
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention relates to a coal-fired flue gas purification method, which relates to the technical field of industrial waste gas purification and comprises the following steps: measuring the smoke concentration of the gas to be exhausted and marking the smoke concentration as the concentration information of the gas to be exhausted; comparing and judging the concentration information of the gas to be discharged with the externally input standard smoke concentration information; when the concentration information of the gas to be exhausted is matched with the concentration information of the standard flue gas, controlling the gas to be exhausted from a chimney; when the concentration information of the gas to be exhausted is not matched with the concentration information of the flue gas reaching the standard, controlling the gas to be exhausted to repeatedly perform secondary dust removal treatment, and outputting new gas to be exhausted; measuring the smoke concentration of new gas to be discharged, marking the smoke concentration as new gas concentration information to be discharged, and covering the old gas concentration information to be discharged; comparing the new concentration information of the gas to be discharged with the concentration information of the gas reaching the standard again for judgment, and repeating the judgment steps; and finishing the discharge of the gas to be discharged from the chimney. The invention has the effect of monitoring the emission of the flue gas after reaching the standard.
Description
Technical Field
The invention relates to the technical field of industrial waste gas purification, in particular to a coal-fired flue gas purification method and a system applying the same.
Background
The sulfur dioxide, nitrogen oxide and dust in the waste gas generated by the coal-fired boiler cause serious pollution to the environment, which is always one of the key points of environmental management and is a difficult problem in environmental management, and particularly, the sulfur dioxide and nitrogen oxide in the waste gas are main pollutants which are difficult to control. The smoke, sulfur dioxide and nitrogen oxides generated in the production process of the coal-fired boiler cause environmental pollution to surrounding areas, and polluted equipment, particularly smoke generated by the coal-fired boiler, must be treated according to the environmental protection requirement.
The prior art can refer to the utility model patent with the grant publication number of CN204786486U, and the utility model discloses a coal fired boiler flue gas treatment system, coal fired boiler flue gas treatment system connects between coal fired boiler and chimney. The coal-fired boiler flue gas treatment system comprises an air preheater, a desulfurizing tower and a flue gas purification waste heat exchanger, wherein the air preheater is connected with a flue at the tail part of the boiler, the air preheater is connected with the desulfurizing tower through a smoke exhaust channel, and the flue gas purification waste heat exchanger is arranged between the desulfurizing tower and a chimney. The flue gas purification waste heat exchanger is used for absorbing and condensing moisture in flue gas by using flue gas waste heat, and can effectively remove dust in the flue gas and play a role in desulfurization.
The above prior art solutions have the following drawbacks: the flue gas is in above-mentioned processing system purification back, often directly discharges to the air from the chimney, generally can not monitor the flue gas before discharging, just so can't learn whether the cleanliness factor of flue gas after the purification is up to standard, if not discharge of up to standard, still can cause the atmosphere pollution.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a coal-fired flue gas purification method which has the effect of monitoring the emission of the flue gas after the flue gas reaches the standard.
The above object of the present invention is achieved by the following technical solutions:
a coal-fired flue gas purification method comprises the following steps:
discharging flue gas in the boiler, and marking the flue gas discharged in the boiler as flue gas outside the boiler;
collecting flue gas outside the furnace, carrying out denitration treatment on the flue gas outside the furnace, and outputting the denitration flue gas outside the furnace;
collecting the denitration flue gas outside the furnace, carrying out primary dust removal treatment on the denitration flue gas outside the furnace, and outputting the dust removal flue gas;
collecting the dedusting flue gas, carrying out desulfurization treatment on the dedusting flue gas, and outputting the desulfurization flue gas;
collecting the desulfurized flue gas, carrying out secondary dust removal treatment on the desulfurized flue gas, and outputting the gas to be discharged;
collecting the gas to be exhausted, measuring the smoke concentration of the gas to be exhausted, marking the smoke concentration of the gas to be exhausted as the concentration information of the gas to be exhausted, and storing the concentration information of the gas to be exhausted;
responding to externally input standard smoke concentration information, calling the concentration information of the smoke to be discharged, and comparing and judging the concentration information of the smoke to be discharged with the standard smoke concentration information;
when the concentration information of the gas to be exhausted is matched with the concentration information of the standard flue gas, controlling the gas to be exhausted from a chimney;
when the concentration information of the gas to be exhausted is not matched with the concentration information of the flue gas reaching the standard, controlling the gas to be exhausted to repeatedly perform secondary dust removal treatment, and outputting new gas to be exhausted;
collecting new gas to be discharged, measuring the smoke concentration of the new gas to be discharged, marking the smoke concentration of the new gas to be discharged as new gas concentration information to be discharged, and covering the old gas concentration information to be discharged;
comparing the new concentration information of the gas to be discharged with the concentration information of the gas reaching the standard again for judgment, and repeating the judgment steps;
and finishing the discharge of the gas to be discharged from the chimney.
By adopting the technical scheme, the flue gas outside the furnace is firstly subjected to external denitration treatment to remove nitrogen oxides in the flue gas outside the furnace and output external denitration flue gas; removing dust of 0.01-50 mu m in the denitration flue gas outside the furnace through primary dust removal treatment of the denitration flue gas outside the furnace, and outputting the dust removal flue gas; removing sulfur oxides in the dedusting flue gas through desulfurization treatment, and outputting the desulfurization flue gas; and (4) carrying out secondary dust removal treatment on the desulfurized flue gas to further remove dust in the desulfurized flue gas and outputting the gas to be discharged. At the moment, the smoke concentration of the gas to be exhausted is measured, and the measured concentration information of the gas to be exhausted is compared with the standard smoke concentration information input by a manager; if the concentration information of the gas to be exhausted is matched with the concentration information of the flue gas reaching the standard, indicating that the gas to be exhausted reaches the emission standard, controlling the gas to be exhausted through a chimney; if the concentration information of the gas to be exhausted does not match the concentration information of the gas reaching the standard, the gas to be exhausted does not reach the emission standard, the gas to be exhausted is controlled to be conveyed to secondary dust removal for repeated dust removal until the gas to be exhausted reaches the standard, and the gas to be exhausted can be exhausted through a chimney. Thereby achieving the effect of monitoring the emission of the flue gas after reaching the standard.
The present invention in a preferred example may be further configured to: marking the flue gas in the boiler as the flue gas in the boiler, carrying out denitration treatment on the flue gas in the boiler, and outputting the denitration flue gas in the boiler.
By adopting the technical scheme, the amino reducing agent is sprayed into a proper position in the boiler, and partial nitrogen oxide in the flue gas in the boiler is reduced into nitrogen gas, so that the denitration in the boiler of the flue gas in the boiler is realized.
The present invention in a preferred example may be further configured to: and collecting the denitration flue gas in the furnace, and adjusting the flame temperature and the oxygen concentration in the furnace.
By adopting the technical scheme, the nitrogen oxides generated by the combustion of the common fuel mainly come from two aspects, namely, the oxidation of nitrogen in air used for combustion; secondly, the nitride contained in the fuel is thermally decomposed and reoxidized in the combustion process. By adjusting the flame temperature and the oxygen concentration in the furnace, the generation and the discharge of oxides in the combustion process can be effectively reduced.
The present invention in a preferred example may be further configured to: and collecting the smoke outside the furnace and absorbing the heat of the smoke outside the furnace.
By adopting the technical scheme, the smoke exhaust temperature of the flue gas outside the furnace is reduced by absorbing the heat of the flue gas outside the furnace at high temperature, so that the energy is saved, and the efficiency is improved.
The present invention in a preferred example may be further configured to: and collecting the denitration flue gas outside the furnace, and preheating the denitration flue gas outside the furnace.
By adopting the technical scheme, the denitration flue gas outside the furnace is preheated to a certain temperature after being preheated, so that the heat exchange performance of the boiler is improved, and the energy consumption is reduced.
The present invention in a preferred example may be further configured to: collecting the dedusting flue gas, measuring the flue gas concentration of the dedusting flue gas, marking the flue gas concentration of the dedusting flue gas as dedusting flue gas concentration information, and storing the dedusting flue gas concentration information;
responding to externally input desulfurization flue gas concentration information, calling dedusting flue gas concentration information, and comparing and judging the dedusting flue gas concentration information with the desulfurization flue gas concentration information;
when the concentration information of the dedusting flue gas is matched with the concentration information of the desulfurization flue gas, controlling the dedusting flue gas to perform desulfurization treatment;
when the concentration information of the dedusting flue gas is not matched with the concentration information of the desulfurization flue gas, controlling the dedusting flue gas to repeatedly perform primary dedusting treatment, and outputting new dedusting flue gas;
collecting new dedusting flue gas, measuring the flue gas concentration of the new dedusting flue gas, marking the flue gas concentration of the new dedusting flue gas as new dedusting flue gas concentration information, and covering the old dedusting flue gas concentration information;
and comparing and judging the new dedusting flue gas concentration information and the desulfurization flue gas concentration information again, and repeating the judging steps until the new dedusting flue gas concentration information is matched with the desulfurization flue gas concentration information.
Through adopting above-mentioned technical scheme, when the flue gas concentration of flue gas is not up to standard just gets into the desulfurizing tower, just can increase the work burden of desulfurizing tower, shortens the life of desulfurizing tower. The method measures the flue gas concentration of the dedusting flue gas, and compares the measured dedusting flue gas concentration information with the desulfurization flue gas concentration information input by the administrator; if the concentration information of the dedusting flue gas is matched with the concentration information of the desulfurization flue gas, the flue gas concentration of the dedusting flue gas reaches the standard of entering a desulfurization tower, and then the dedusting flue gas is controlled to enter the desulfurization tower; if the concentration information of the dedusting flue gas is not matched with the concentration information of the desulfurization flue gas, the flue gas concentration of the dedusting flue gas does not reach the standard of entering the desulfurization tower, the dedusting flue gas is controlled to be conveyed to primary dedusting for repeated dedusting until the dedusting flue gas reaches the standard, and then the dedusting flue gas can enter the desulfurization tower. Therefore, the flue gas concentration of the dust-removing flue gas is monitored to meet the standard and then enters the desulfurizing tower, and the effects of reducing the workload of the desulfurizing tower and prolonging the service life of the desulfurizing tower are achieved.
The present invention in a preferred example may be further configured to: collecting the desulfurized flue gas, and carrying out demisting treatment on the desulfurized flue gas.
By adopting the technical scheme, fog with the grain diameter of 10-60 microns is easily generated in the desulfurization process, and the fog not only contains water, but also dissolves sulfuric acid, sulfate, sulfur dioxide and the like, and can cause pollution and serious corrosion to equipment. The desulfurization flue gas is subjected to demisting treatment, so that the desulfurization flue gas can be prevented from corroding equipment, and the service life of the equipment is prolonged.
Aiming at the defects in the prior art, the second purpose of the invention is to provide a flue gas purification system which has the effect of monitoring the emission of the flue gas after the flue gas reaches the standard.
The above object of the present invention is achieved by the following technical solutions:
a flue gas purification system applying a coal-fired flue gas purification method comprises:
the first input module is used for inputting the information of the concentration of the flue gas reaching the standard;
the first monitoring module is used for monitoring the concentration information of the gas to be exhausted;
the first comparison module is used for comparing the concentration information of the gas to be discharged with the concentration information of the gas reaching the standard;
the first control module is used for controlling the emission of the smoke to be exhausted.
By adopting the technical scheme, the concentration information of the gas to be exhausted is monitored, and the monitored concentration information of the gas to be exhausted is compared with the standard-reaching concentration information of the gas to be exhausted input by a manager; if the concentration information of the gas to be exhausted is matched with the concentration information of the flue gas reaching the standard, indicating that the gas to be exhausted reaches the emission standard, controlling the gas to be exhausted through a chimney; if the concentration information of the gas to be exhausted does not match the concentration information of the gas reaching the standard, the gas to be exhausted does not reach the emission standard, the gas to be exhausted is controlled to remove dust repeatedly until the gas to be exhausted reaches the emission standard, and the gas to be exhausted can be controlled to be exhausted through a chimney. Thereby achieving the effect of monitoring the emission of the gas to be exhausted after reaching the standard.
The present invention in a preferred example may be further configured to: further comprising:
the second input module is used for inputting the concentration information of the desulfurized flue gas;
the second monitoring module is used for monitoring the concentration information of the dedusting flue gas;
the second comparison module is used for comparing the concentration information of the dedusting flue gas with the concentration information of the desulfurization flue gas;
and the second control module is used for controlling the dedusting flue gas to enter the desulfurizing tower.
By adopting the technical scheme, the concentration information of the dedusting flue gas is monitored, and the monitored concentration information of the dedusting flue gas is compared with the concentration information of the desulfurization flue gas input by a manager; if the concentration information of the dedusting flue gas is matched with the concentration information of the desulfurization flue gas, the dedusting flue gas is indicated to reach the standard of entering a desulfurization tower, and the dedusting flue gas is controlled to enter the desulfurization tower; if the concentration information of the dedusting flue gas is not matched with the concentration information of the desulfurization flue gas, the dedusting flue gas does not reach the standard of entering the desulfurization tower, the dedusting flue gas is controlled to be repeatedly dedusted until the dedusting flue gas reaches the standard, and then the dedusting flue gas can be controlled to enter the desulfurization tower for desulfurization. Therefore, the flue gas concentration of the dust-removing flue gas is monitored to meet the standard and then enters the desulfurizing tower, and the effects of reducing the workload of the desulfurizing tower and prolonging the service life of the desulfurizing tower are achieved.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the monitoring of the emission of the gas to be exhausted after reaching the standard can be realized, and the possibility of atmosphere pollution caused by the direct emission of the gas to be exhausted is avoided;
2. the flue gas concentration that can monitor the dust removal flue gas just can get into the desulfurizing tower after meeting the standard, alleviates the work burden of desulfurizing tower, prolongs the life of desulfurizing tower.
Drawings
Fig. 1 is a block diagram of the entire system in embodiment 2.
In the figure, 1, a first input module; 2. a first monitoring module; 3. a first comparison module; 4. a first control module; 5. a second input module; 6. a second monitoring module; 7. a second comparison module; 8. and a second control module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1
Referring to fig. 1, the coal-fired flue gas purification method disclosed by the invention comprises the following steps:
marking the flue gas in the boiler as the flue gas in the boiler, spraying an amino reducing agent at a proper position of a hearth of the boiler by adopting an SNCR (selective non-catalytic reduction) denitration system, reducing partial nitrogen oxides in the flue gas in the boiler into nitrogen so as to finish the denitration treatment of the flue gas in the boiler, and outputting the denitration flue gas in the boiler.
The denitration flue gas in the furnace is collected, a low-nitrogen combustor is adopted, and the generation and emission of the nitrogen oxide in the combustion process are reduced by improving the combustion technology of fuel in the hearth of the boiler and adjusting the flame temperature and the oxygen concentration in the furnace according to the generation mechanism of the nitrogen oxide in the combustion process.
And discharging denitration flue gas in the boiler, and marking the flue gas discharged in the boiler as flue gas outside the boiler.
The smoke outside the furnace is collected and passes through the economizer to absorb the heat of the smoke outside the furnace, thereby reducing the smoke exhaust temperature of the smoke outside the furnace, saving energy and improving efficiency; the economizer is arranged at the lower part of a flue at the tail part of the boiler and used for recovering the waste heat of the flue gas outside the boiler.
Collecting flue gas outside the furnace, spraying ammonia gas or other suitable reducing agents into the flue gas outside the furnace at the upstream of the catalyst by adopting an SCR denitration system, reducing nitrogen oxides in the flue gas outside the furnace into nontoxic N2 and H2O at 290-400 ℃ by utilizing the catalyst (such as TiO2, V2O5 and WO 3) and hardly generating an oxidation reaction of NH3, thereby reducing the consumption of NH3, completing the denitration treatment of the flue gas outside the furnace and outputting the denitration flue gas outside the furnace.
The denitration flue gas outside the furnace is collected, the air preheater is adopted, and the denitration flue gas outside the furnace is preheated to a certain temperature through the radiating fins inside the air preheater, so that the heat exchange performance of the boiler is improved, and the energy consumption is reduced.
Collecting the denitration flue gas outside the furnace, adopting an electrostatic dust collector, ionizing the denitration flue gas outside the furnace by using a high-voltage electric field, separating dust in the gas flow from the gas flow under the action of the electric field, removing 0.01-50 mu m of dust in the denitration flue gas outside the furnace, finishing primary dust removal treatment of the denitration flue gas outside the furnace, and outputting the dust removal flue gas.
Collecting the dedusting flue gas, measuring the flue gas concentration of the dedusting flue gas through a flue gas measuring instrument, marking the flue gas concentration of the dedusting flue gas as dedusting flue gas concentration information, and storing the dedusting flue gas concentration information.
And responding to the desulfurization flue gas concentration information input by an administrator, calling the dedusting flue gas concentration information, and comparing and judging the dedusting flue gas concentration information with the desulfurization flue gas concentration information. And when the concentration information of the dedusting flue gas is matched with the concentration information of the desulfurization flue gas, controlling the dedusting flue gas to enter the next step. And when the concentration information of the dedusting flue gas is not matched with the concentration information of the desulfurization flue gas, controlling the dedusting flue gas to repeatedly perform primary dedusting treatment, and outputting new dedusting flue gas. Collecting new dedusting flue gas, measuring the flue gas concentration of the new dedusting flue gas, marking the flue gas concentration of the new dedusting flue gas as new dedusting flue gas concentration information, and covering the old dedusting flue gas concentration information. And comparing and judging the new dedusting flue gas concentration information and the desulfurization flue gas concentration information again, and repeating the judging steps until the new dedusting flue gas concentration information is matched with the desulfurization flue gas concentration information, so that the new dedusting flue gas can be controlled to enter the next step.
Through the steps, if the flue gas concentration of the flue gas does not reach the standard, the flue gas enters the desulfurizing tower, the workload of the desulfurizing tower is increased, and the service life of the desulfurizing tower is shortened; therefore, the flue gas concentration of the dust removal flue gas can be monitored and then the flue gas enters the desulfurizing tower after meeting the standard, so that the effects of reducing the workload of the desulfurizing tower and prolonging the service life of the desulfurizing tower are achieved.
Collecting the dedusting flue gas, enabling the dedusting flue gas to enter a wet absorption tower of a desulfurization system, and enabling the dedusting flue gas to be in countercurrent contact with alkaline limestone slurry droplets sprayed from top to bottom, wherein acidic oxides SO2 and other pollutants HCL, HF and the like are absorbed, SO that the dedusting flue gas is fully purified, the desulfurization treatment of the dedusting flue gas is realized, and the desulfurization flue gas is output.
Collecting the desulfurized flue gas, and demisting the fog with the particle size of 10-60 microns generated in the desulfurization process by adopting a demister. The fog not only contains water, but also dissolves sulfuric acid, sulfate, sulfur dioxide and the like, which can cause pollution and serious corrosion to equipment, and the demisting treatment is carried out on the desulfurization flue gas, so that the corrosion of the fog to the equipment can be reduced, and the service life of the equipment can be prolonged.
Collecting the desulfurized flue gas, adopting a wet electric precipitator, enabling the dust in the desulfurized flue gas to be charged by means of high-voltage corona discharge, enabling the charged dust to reach a dust collecting plate under the action of an electric field force, treating wet gas with high water content and even saturation, finishing secondary dust removal treatment on the desulfurized flue gas, and outputting the gas to be discharged.
Collecting the gas to be discharged, measuring the smoke concentration of the gas to be discharged by a smoke measuring instrument, marking the smoke concentration of the gas to be discharged as the concentration information of the gas to be discharged, and storing the concentration information of the gas to be discharged.
Responding to the standard smoke concentration information input by an administrator, calling the concentration information of the smoke to be discharged, and comparing and judging the concentration information of the smoke to be discharged with the standard smoke concentration information; when the concentration information of the gas to be exhausted is matched with the concentration information of the standard flue gas, controlling the gas to be exhausted from a chimney; when the concentration information of the gas to be exhausted is not matched with the concentration information of the flue gas reaching the standard, controlling the gas to be exhausted to repeatedly perform secondary dust removal treatment, and outputting new gas to be exhausted; collecting new gas to be discharged, measuring the smoke concentration of the new gas to be discharged, marking the smoke concentration of the new gas to be discharged as new gas concentration information to be discharged, and covering the old gas concentration information to be discharged; comparing the new concentration information of the gas to be discharged with the concentration information of the gas reaching the standard again for judgment, and repeating the judgment steps; and finishing the discharge of the gas to be discharged from the chimney.
Through the steps, the monitoring that the gas to be discharged is discharged after reaching the standard can be realized, and the possibility that the gas to be discharged is directly discharged to pollute the atmosphere is avoided.
The implementation principle of the embodiment is as follows: the flue gas outside the furnace is firstly subjected to external denitration treatment to remove nitrogen oxides in the flue gas outside the furnace, and the flue gas outside the furnace is output; removing dust of 0.01-50 mu m in the denitration flue gas outside the furnace through primary dust removal treatment of the denitration flue gas outside the furnace, and outputting the dust removal flue gas; removing sulfur oxides in the dedusting flue gas through desulfurization treatment, and outputting the desulfurization flue gas; and (4) carrying out secondary dust removal treatment on the desulfurized flue gas to further remove dust in the desulfurized flue gas and outputting the gas to be discharged. At the moment, the smoke concentration of the gas to be exhausted is measured, and the measured concentration information of the gas to be exhausted is compared with the standard smoke concentration information input by a manager; if the concentration information of the gas to be exhausted is matched with the concentration information of the flue gas reaching the standard, indicating that the gas to be exhausted reaches the emission standard, controlling the gas to be exhausted through a chimney; if the concentration information of the gas to be exhausted does not match the concentration information of the gas reaching the standard, the gas to be exhausted does not reach the emission standard, the gas to be exhausted is controlled to be conveyed to secondary dust removal for repeated dust removal until the gas to be exhausted reaches the standard, and the gas to be exhausted can be exhausted through a chimney. Thereby achieving the effect of monitoring the emission of the flue gas after reaching the standard.
Example 2
Referring to fig. 1, on the basis of embodiment 1, the flue gas purification system of the coal-fired flue gas purification method disclosed by the invention comprises:
the first input module 1 comprises input equipment such as a keyboard and the like and is used for inputting standard smoke concentration information;
the first monitoring module 2 comprises a flue gas determinator arranged at a discharge port of the wet electric precipitator and is used for determining concentration information of gas to be discharged;
the first comparison module 3 is used for comparing the concentration information of the to-be-discharged flue gas with the concentration information of the standard flue gas;
and the first control module 4 comprises a draught fan arranged at a discharge port of the wet electric dust remover and is used for controlling the discharge of the to-be-discharged smoke.
Through the system, the concentration information of the gas to be exhausted is monitored, and the monitored concentration information of the gas to be exhausted is compared with the concentration information of the smoke reaching the standard input by a manager; if the concentration information of the gas to be exhausted is matched with the concentration information of the flue gas reaching the standard, indicating that the gas to be exhausted reaches the emission standard, controlling the gas to be exhausted through a chimney; if the concentration information of the gas to be exhausted is not matched with the concentration information of the gas reaching the standard, the gas to be exhausted is controlled to be conveyed back to the wet type electric dust remover for repeated dust removal, and the gas to be exhausted can be controlled to be exhausted through a chimney until the gas to be exhausted reaches the emission standard. Thereby achieving the effect of monitoring the emission of the gas to be exhausted after reaching the standard.
Referring to fig. 1, the system further comprises:
the second input module 5 comprises input equipment such as a keyboard and the like and is used for inputting the concentration information of the desulfurized flue gas;
the second monitoring module 6 comprises a flue gas determinator arranged at the discharge port of the electrostatic dust collector and used for determining the concentration information of the dust-removing flue gas;
the second comparison module 7 is used for comparing the concentration information of the dedusting flue gas and the concentration information of the desulfurization flue gas;
and the second control module 8 comprises an induced draft fan arranged at the discharge port of the electrostatic dust collector and is used for controlling the dedusting flue gas to enter the wet absorption tower.
By the system, the concentration information of the dedusting flue gas is monitored, and the monitored concentration information of the dedusting flue gas is compared with the concentration information of the desulfurization flue gas input by a manager; if the concentration information of the dedusting flue gas is matched with the concentration information of the desulfurization flue gas, the dedusting flue gas is indicated to reach the standard of entering a wet absorption tower, and the dedusting flue gas is controlled to enter the wet absorption tower; if the concentration information of the dedusting flue gas is not matched with the concentration information of the desulfurization flue gas, the dedusting flue gas is not up to the standard of entering the wet absorption tower, the dedusting flue gas is controlled to be conveyed back to the electrostatic precipitator for repeated dedusting, and the dedusting flue gas can be controlled to enter the wet absorption tower for desulfurization until the dedusting flue gas reaches the standard. Therefore, the flue gas concentration of the dust removal flue gas is monitored to meet the standard and then enters the wet absorption tower, and the effects of reducing the workload of the wet absorption tower and prolonging the service life of the desulfurization tower are achieved.
The implementation principle of the embodiment is as follows: when the dust removal flue gas is discharged from the discharge port of the electrostatic dust collector, the second monitoring module 6 can control the flue gas determinator to determine the dust removal flue gas concentration information, the second comparison module 7 can compare and judge the dust removal flue gas concentration information and the desulfurization flue gas concentration information, and the second control module 8 can control the dust removal flue gas according to the comparison result of the second comparison module 7 so as to ensure that the flue gas concentration of the dust removal flue gas can enter the wet absorption tower after reaching the standard. When waiting to discharge fume from wet-type electrostatic precipitator's discharge port discharge, first monitoring module 2 can control the flue gas apparatus and treat that the fume concentration information of discharging fume surveys and survey, and first comparison module 3 can treat that fume concentration information and the flue gas concentration information up to standard compare the judgement, and first control module 4 can treat that the fume is discharged according to the comparison result of first comparison module 3 and control to the guarantee is treated that the fume reaches emission standard and just can pass through the chimney emission.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. A coal-fired flue gas purification method is characterized by comprising the following steps:
discharging flue gas in the boiler, and marking the flue gas discharged in the boiler as flue gas outside the boiler;
collecting flue gas outside the furnace, carrying out denitration treatment on the flue gas outside the furnace, and outputting the denitration flue gas outside the furnace;
collecting the denitration flue gas outside the furnace, carrying out primary dust removal treatment on the denitration flue gas outside the furnace, and outputting the dust removal flue gas;
collecting the dedusting flue gas, carrying out desulfurization treatment on the dedusting flue gas, and outputting the desulfurization flue gas;
collecting the desulfurized flue gas, carrying out secondary dust removal treatment on the desulfurized flue gas, and outputting the gas to be discharged;
collecting the gas to be exhausted, measuring the smoke concentration of the gas to be exhausted, marking the smoke concentration of the gas to be exhausted as the concentration information of the gas to be exhausted, and storing the concentration information of the gas to be exhausted;
responding to externally input standard smoke concentration information, calling the concentration information of the smoke to be discharged, and comparing and judging the concentration information of the smoke to be discharged with the standard smoke concentration information;
when the concentration information of the gas to be exhausted is matched with the concentration information of the standard flue gas, controlling the gas to be exhausted from a chimney;
when the concentration information of the gas to be exhausted is not matched with the concentration information of the flue gas reaching the standard, controlling the gas to be exhausted to repeatedly perform secondary dust removal treatment, and outputting new gas to be exhausted;
collecting new gas to be discharged, measuring the smoke concentration of the new gas to be discharged, marking the smoke concentration of the new gas to be discharged as new gas concentration information to be discharged, and covering the old gas concentration information to be discharged;
comparing the new concentration information of the gas to be discharged with the concentration information of the gas reaching the standard again for judgment, and repeating the judgment steps;
and finishing the discharge of the gas to be discharged from the chimney.
2. The coal-fired flue gas purification method according to claim 1, further comprising the steps of:
marking the flue gas in the boiler as the flue gas in the boiler, carrying out denitration treatment on the flue gas in the boiler, and outputting the denitration flue gas in the boiler.
3. The coal-fired flue gas purification method according to claim 2, further comprising the steps of:
and collecting the denitration flue gas in the furnace, and adjusting the flame temperature and the oxygen concentration in the furnace.
4. The coal-fired flue gas purification method according to claim 1, further comprising the steps of:
and collecting the smoke outside the furnace and absorbing the heat of the smoke outside the furnace.
5. The coal-fired flue gas purification method according to claim 1, further comprising the steps of:
and collecting the denitration flue gas outside the furnace, and preheating the denitration flue gas outside the furnace.
6. The coal-fired flue gas purification method according to claim 1, further comprising the steps of:
collecting the dedusting flue gas, measuring the flue gas concentration of the dedusting flue gas, marking the flue gas concentration of the dedusting flue gas as dedusting flue gas concentration information, and storing the dedusting flue gas concentration information;
responding to externally input desulfurization flue gas concentration information, calling dedusting flue gas concentration information, and comparing and judging the dedusting flue gas concentration information with the desulfurization flue gas concentration information;
when the concentration information of the dedusting flue gas is matched with the concentration information of the desulfurization flue gas, controlling the dedusting flue gas to perform desulfurization treatment;
when the concentration information of the dedusting flue gas is not matched with the concentration information of the desulfurization flue gas, controlling the dedusting flue gas to repeatedly perform primary dedusting treatment, and outputting new dedusting flue gas;
collecting new dedusting flue gas, measuring the flue gas concentration of the new dedusting flue gas, marking the flue gas concentration of the new dedusting flue gas as new dedusting flue gas concentration information, and covering the old dedusting flue gas concentration information;
and comparing and judging the new dedusting flue gas concentration information and the desulfurization flue gas concentration information again, and repeating the judging steps until the new dedusting flue gas concentration information is matched with the desulfurization flue gas concentration information.
7. The coal-fired flue gas purification method according to claim 1, further comprising the steps of:
collecting the desulfurized flue gas, and carrying out demisting treatment on the desulfurized flue gas.
8. A flue gas purification system to which the coal-fired flue gas purification method according to any one of claims 1 to 7 is applied, comprising:
the first input module (1) is used for inputting the information of the concentration of the flue gas reaching the standard;
the first monitoring module (2) is used for monitoring the concentration information of the gas to be exhausted;
the first comparison module (3) is used for comparing the concentration information of the to-be-discharged flue gas with the concentration information of the standard flue gas;
the first control module (4) is used for controlling the emission of the smoke to be exhausted.
9. The flue gas purification system according to claim 8, further comprising:
the second input module (5) is used for inputting the concentration information of the desulfurized flue gas;
the second monitoring module (6) is used for monitoring the concentration information of the dedusting flue gas;
the second comparison module (7) is used for comparing the concentration information of the dedusting flue gas with the concentration information of the desulfurization flue gas;
and the second control module (8) is used for controlling the dedusting flue gas to enter the desulfurizing tower.
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Application publication date: 20200929 |