CN112604470A - Tail gas desulfurization method for thermal power plant - Google Patents
Tail gas desulfurization method for thermal power plant Download PDFInfo
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- CN112604470A CN112604470A CN202011425088.3A CN202011425088A CN112604470A CN 112604470 A CN112604470 A CN 112604470A CN 202011425088 A CN202011425088 A CN 202011425088A CN 112604470 A CN112604470 A CN 112604470A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/58—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/007—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 by irradiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/80—Type of catalytic reaction
- B01D2255/802—Photocatalytic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/91—Bacteria; Microorganisms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/804—UV light
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Abstract
The invention relates to a tail gas desulfurization method for a thermal power plant, which comprises the following steps of S1: firstly, intensively conveying tail gas generated by a thermal power plant into a waste heat recovery device through a tail gas collecting pipe; s2: connecting a cold water inlet pipe of the waste heat recovery device to a cold water source, connecting a hot water outlet pipe to a water storage barrel, and exchanging heat for tail gas to remove most heat in the tail gas; s3: the tail gas after heat exchange passes through the filtering structure, and the first metal filter screen, the activated carbon filter screen and the photocatalyst filter screen are arranged in the filtering structure.
Description
Technical Field
The invention relates to the technical field of tail gas desulfurization, in particular to a tail gas desulfurization method for a thermal power plant.
Technical Field
A thermal power plant, referred to as a thermal power plant, is a plant that produces electric energy using a combustible (e.g., coal) as a fuel. The basic production process is as follows: the fuel heats water to generate steam during combustion, chemical energy of the fuel is converted into heat energy, the steam pressure drives a steam turbine to rotate, the heat energy is converted into mechanical energy, then the steam turbine drives a generator to rotate, and the mechanical energy is converted into electric energy. They generate electricity by taking advantage of the pressure drop during the conversion of high temperature, high pressure steam or gas through a turbine to low pressure air or condensate.
The thermal power factory contains more sulphide at a certain amount of tail gas of dust in the power generation process in these tail gases, if do not pass through desulfurization treatment, can cause the formation of atmosphere pollution and acid rain, for solving the problem of tail gas desulfurization, through adopting wet limestone method desulfurization in the current technology, nevertheless there are some weak points through the method of carrying out desulfurization through wet limestone method:
1) the wet desulphurization can not recycle the heat of the tail gas, so that the heat of the tail gas is directly transferred to the surface of equipment, the temperature of the surface of hot equipment is easily overhigh, and the temperature of the whole environment is increased, so that the use is inconvenient;
2) during wet desulphurization, fresh air needs to be fed, but air is directly pumped into the desulphurization tower, dust and bacteria contained in the air easily cause the limestone slurry to deteriorate, and a good desulphurization effect cannot be achieved;
3) the tail gas is directly discharged through a chimney after being desulfurized, and the sulfide in the tail gas directly rises to a tail gas clean pipe due to the fact that the tail gas flowing speed is high, so that the tail gas with the directly discharged content exceeding the standard pollutes the environment, and the tail gas is poor in environmental protection and does not accord with the environmental protection idea.
Disclosure of Invention
The invention aims to solve the problems that the heat of the tail gas cannot be recycled in the existing wet desulphurization, so that the heat of the tail gas is directly transferred to the surface of equipment, and the surface temperature of the hot equipment is easily overhigh, and simultaneously, the tail gas is convenient to detect, so that the tail gas completely reaches the emission standard.
The aim of the invention is achieved by the following measures: a tail gas desulfurization method for a thermal power plant comprises the following steps:
s1: firstly, intensively conveying tail gas generated by a thermal power plant into a waste heat recovery device through a tail gas collecting pipe;
s2: connecting a cold water inlet pipe of the waste heat recovery device to a cold water source, connecting a hot water outlet pipe to a water storage barrel, and exchanging heat for tail gas to remove most heat in the tail gas;
s3: the tail gas after heat exchange passes through the filtering structure, and the first metal filter screen, the activated carbon filter screen and the photocatalyst filter screen are arranged in the filtering structure, so that the tail gas is conveniently filtered, impurities contained in the tail gas are removed, the purity of a hydrolysis solution is improved, the desulfurization efficiency is improved, and the use is convenient;
s4: the tail gas after being filtered enters a desulfurizing tower, the tail gas is converted into CaSO3 through wet lime water prepared in advance, and fresh air is sent through a blower, SO that CaSO3 is oxidized into CaSO4, and a byproduct of CaSO4 desulfurization is gypsum;
s5: the desulfurized tail gas enters a packing layer in the middle of the desulfurization tower, and the tail gas is sprayed by a spraying pipe, so that gas and liquid are distributed more uniformly, and removal of sulfides in the tail gas is facilitated;
s6: the sprayed tail gas enters a tail gas cleaning pipe through a demisting layer, and enters sulfide detection equipment through the tail gas cleaning pipe to detect sulfides;
s7: when the content of the sulfide in the tail gas is detected to be not up to the standard, the three-way valve is opened, so that the tail gas enters the desulfurizing tower again through the gas return pipe, and the sulfide in the tail gas is further removed through the oxidation crystallization of the lime water slurry;
s8: and when the content of the sulfide is detected to reach the standard, closing the three-way valve, enabling the tail gas to enter the chimney along the exhaust pipe, and discharging the tail gas into the external atmosphere along the chimney after heat absorption and infrared sterilization.
The lime water adjusting steps are as follows:
a 1: conveying limestone to a crushing device for crushing, and conveying limestone powder to a stirring box through a conveying device;
a 2: then, conveying the heat exchange water flow in the water storage barrel to a stirring box, and mechanically stirring uniformly for use;
a 3: and finally, conveying the lime water slurry to the inside of the desulfurization tower through a pumping pump.
When the air blower sends fresh air, the fresh air is filtered by the efficient filter screen and purified by the ultraviolet lamp sterilizing lamp, so that dust and bacteria in the fresh air are removed, and deterioration of lime water slurry is prevented.
The matrix infrared lamp is installed at the top of chimney inner chamber, the heat absorbing sheet is installed to the bottom of chimney inner chamber.
The catalyst component in the filler layer is a titanium dioxide catalyst.
The invention has the beneficial effects that:
according to the tail gas desulfurization method for the thermal power plant, before the tail gas enters the desulfurization tower, cold water is conveyed into the waste heat recovery device through the waste heat recovery device and the cold water inlet pipe, the cold water is conveyed into the water storage barrel through the hot water outlet pipe, heat exchange is carried out on the tail gas, the temperature of the tail gas is reduced, meanwhile, lime water slurry is prepared by utilizing the hot water, and the tail gas is sprayed, so that the reaction rate of the flue gas is promoted, heating is not needed, electric energy is saved, and the tail gas desulfurization method is convenient to use.
According to the tail gas desulfurization method for the thermal power plant, the first metal filter screen, the activated carbon filter screen and the photocatalyst filter screen are arranged in the tail gas filter structure subjected to cooling and heat exchange, so that the tail gas is conveniently filtered, impurities contained in the tail gas are removed, the purity of a hydrolysis solution is improved, the desulfurization efficiency is improved, and the use is convenient.
The invention relates to a tail gas desulfurization method for a thermal power plant, which is provided with sulfide detection equipment for detecting sulfides, wherein when the content of the sulfides in the detected tail gas is not up to the standard, a three-way valve is opened, so that the tail gas enters a desulfurization tower again through an air return pipe and is oxidized and crystallized again through lime water slurry, the sulfides in the tail gas are further removed, when the content of the sulfides is up to the standard, the three-way valve is closed, so that the tail gas enters the interior of a chimney along an exhaust pipe, and is discharged into the external atmosphere along the chimney after heat absorption and infrared sterilization, and the problem of reduction of desulfurization efficiency caused by over-fast rising of the tail gas can be effectively avoided.
Detailed Description
Example one
The first step is as follows: firstly, intensively conveying tail gas generated by a thermal power plant into a waste heat recovery device through a tail gas collecting pipe;
the second step is that: connecting a cold water inlet pipe of the waste heat recovery device to a cold water source, connecting a hot water outlet pipe to a water storage barrel, and exchanging heat for tail gas to remove most heat in the tail gas;
the third step: the tail gas after heat exchange passes through the filtering structure, and the first metal filter screen, the activated carbon filter screen and the photocatalyst filter screen are arranged in the filtering structure, so that the tail gas is conveniently filtered, impurities contained in the tail gas are removed, the purity of a hydrolysis solution is improved, the desulfurization efficiency is improved, and the use is convenient;
the fourth step: the tail gas after being filtered enters a desulfurizing tower, the tail gas is converted into CaSO3 through wet lime water prepared in advance, and fresh air is sent through a blower, SO that CaSO3 is oxidized into CaSO4, and a byproduct of CaSO4 desulfurization is gypsum;
the fifth step: the desulfurized tail gas enters a packing layer in the middle of the desulfurization tower, and the tail gas is sprayed by a spraying pipe, so that gas and liquid are distributed more uniformly, and removal of sulfides in the tail gas is facilitated;
and a sixth step: the sprayed tail gas enters a tail gas cleaning pipe through a demisting layer, and enters sulfide detection equipment through the tail gas cleaning pipe to detect sulfides;
the seventh step: when the content of the sulfide in the tail gas is detected to be not up to the standard, the three-way valve is opened, so that the tail gas enters the desulfurizing tower again through the gas return pipe, and the sulfide in the tail gas is further removed through the oxidation crystallization of the lime water slurry;
eighth step: and when the content of the sulfide is detected to reach the standard, closing the three-way valve, enabling the tail gas to enter the chimney along the exhaust pipe, and discharging the tail gas into the external atmosphere along the chimney after heat absorption and infrared sterilization.
Example two
The lime water adjusting steps are as follows:
a 1: conveying limestone to a crushing device for crushing, and conveying limestone powder to a stirring box through a conveying device;
a 2: then, conveying the heat exchange water flow in the water storage barrel to a stirring box, and mechanically stirring uniformly for use;
a 3: and finally, conveying the lime water slurry to the inside of the desulfurization tower through a pumping pump.
EXAMPLE III
The power is switched on, the air blower pumps air into the air blower, then the air is sent to the high-efficiency filter screen of the fresh air duct and the ultraviolet lamp sterilizing lamp through the pipeline, dust and bacteria in fresh air are removed through the filtration of the high-efficiency filter screen and the purification of the ultraviolet lamp sterilizing lamp, and the deterioration of lime water slurry is prevented.
Example four
Matrix infrared lamp is installed at the top of chimney inner chamber, and the heat absorbing sheet is installed to the bottom of chimney inner chamber, carries out the heat transfer to tail gas through the heat absorbing sheet earlier, reduces the temperature of tail gas, avoids the too high influence surrounding environment of tail gas temperature, simultaneously through arranging the infrared lamp that distributes, carries out germicidal treatment to tail gas, reduces the bacterial composition that contains in the tail gas, optimizes the environment.
EXAMPLE five
The catalyst component in the packing layer is titanium dioxide catalyst, and the titanium dioxide is used as the desulfurization catalyst, so that the desulfurization efficiency of the sulfuration in the tail gas is improved, and the use is convenient.
In conclusion, the beneficial effects of the invention are as follows:
before tail gas enters into the desulfurizing tower inside, through waste heat recovery device, inside waste heat recovery device is carried with cold water to rethread cold inlet tube, carries the water storage bucket with cold water through hot outlet pipe, carries out the heat transfer to tail gas, reduces the temperature of tail gas, utilizes hot water preparation lime water thick liquid simultaneously to spray tail gas, promote the reaction rate of flue gas, need not to heat, save the electric energy, convenient to use.
Inside first metal filters, active carbon filter screen and the photocatalyst filter screen of being equipped with of tail gas filtration structure through the cooling heat transfer, be convenient for filter tail gas, get rid of the impurity that contains in the tail gas, improve the purity of hydrolysis solution, improve desulfurization efficiency, convenient to use.
The sulphide check out test set that is equipped with, detect the sulphide, when detecting tail gas sulphide content and can't reach the standard, the three-way valve is opened, make tail gas enter into the desulfurizing tower again through the muffler, pass through the oxidation crystallization of lime wash thick liquid once more, further get rid of the sulphide in the tail gas, when detecting that sulphide content reaches the standard, the three-way valve is closed, make tail gas enter into the inside of chimney along the blast pipe, after heat absorption and infrared sterilization, discharge in the external atmosphere along the chimney, can effectively avoid the problem that the tail gas rises and leads to desulfurization efficiency to reduce too fast.
Matrix infrared lamp and heat sink that are equipped with carry out the heat transfer to tail gas through the heat sink earlier, reduce the temperature of tail gas, avoid the too high influence surrounding environment of tail gas temperature, simultaneously through arranging the infrared lamp that distributes, carry out germicidal treatment to tail gas, reduce the bacterial composition that contains in the tail gas, optimize the environment.
Claims (5)
1. A tail gas desulfurization method for a thermal power plant is characterized by comprising the following steps: the method comprises the following steps:
s1: firstly, intensively conveying tail gas generated by a thermal power plant into a waste heat recovery device through a tail gas collecting pipe;
s2: connecting a cold water inlet pipe of the waste heat recovery device to a cold water source, connecting a hot water outlet pipe to a water storage barrel, and exchanging heat for tail gas to remove most heat in the tail gas;
s3: the tail gas after heat exchange passes through the filtering structure, and the first metal filter screen, the activated carbon filter screen and the photocatalyst filter screen are arranged in the filtering structure, so that the tail gas is conveniently filtered, impurities contained in the tail gas are removed, the purity of a hydrolysis solution is improved, the desulfurization efficiency is improved, and the use is convenient;
s4: the tail gas after being filtered enters a desulfurizing tower, the tail gas is converted into CaSO3 through wet lime water prepared in advance, and fresh air is sent through a blower, SO that CaSO3 is oxidized into CaSO4, and a byproduct of CaSO4 desulfurization is gypsum;
s5: the desulfurized tail gas enters a packing layer in the middle of the desulfurization tower, and the tail gas is sprayed by a spraying pipe, so that gas and liquid are distributed more uniformly, and removal of sulfides in the tail gas is facilitated;
s6: the sprayed tail gas enters a tail gas cleaning pipe through a demisting layer, and enters sulfide detection equipment through the tail gas cleaning pipe to detect sulfides;
s7: when the content of the sulfide in the tail gas is detected to be not up to the standard, the three-way valve is opened, so that the tail gas enters the desulfurizing tower again through the gas return pipe, and the sulfide in the tail gas is further removed through the oxidation crystallization of the lime water slurry;
s8: and when the content of the sulfide is detected to reach the standard, closing the three-way valve, enabling the tail gas to enter the chimney along the exhaust pipe, and discharging the tail gas into the external atmosphere along the chimney after heat absorption and infrared sterilization.
2. The method for desulfurizing tail gas of a thermal power plant according to claim 1, wherein the method comprises the following steps: the lime water adjusting steps are as follows:
a 1: conveying limestone to a crushing device for crushing, and conveying limestone powder to a stirring box through a conveying device;
a 2: then, conveying the heat exchange water flow in the water storage barrel to a stirring box, and mechanically stirring uniformly for use;
a 3: and finally, conveying the lime water slurry to the inside of the desulfurization tower through a pumping pump.
3. The method for desulfurizing tail gas of a thermal power plant according to claim 1, wherein the method comprises the following steps: when the air blower sends fresh air, the fresh air is filtered by the efficient filter screen and purified by the ultraviolet lamp sterilizing lamp, so that dust and bacteria in the fresh air are removed, and deterioration of lime water slurry is prevented.
4. The method for desulfurizing tail gas of a thermal power plant according to claim 1, wherein the method comprises the following steps: the matrix infrared lamp is installed at the top of chimney inner chamber, the heat absorbing sheet is installed to the bottom of chimney inner chamber.
5. The method for desulfurizing tail gas of a thermal power plant according to claim 1, wherein the method comprises the following steps:
the catalyst component in the filler layer is a titanium dioxide catalyst.
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| CN202011425088.3A CN112604470A (en) | 2020-12-08 | 2020-12-08 | Tail gas desulfurization method for thermal power plant |
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| CN202011425088.3A CN112604470A (en) | 2020-12-08 | 2020-12-08 | Tail gas desulfurization method for thermal power plant |
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2020
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| CN103341305A (en) * | 2013-06-26 | 2013-10-09 | 哈尔滨工程大学 | Preparation method of packing used for improving efficiency of ship waste gas absorption tower |
| CN204637897U (en) * | 2015-05-22 | 2015-09-16 | 海诺尔环保产业股份有限公司 | A kind of incineration of garbage furnace exhaust gas intelligence harmless treatment chimney |
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