CN210993719U - White smoke-flue gas deacidification integration processing system disappears - Google Patents
White smoke-flue gas deacidification integration processing system disappears Download PDFInfo
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- CN210993719U CN210993719U CN201921797178.8U CN201921797178U CN210993719U CN 210993719 U CN210993719 U CN 210993719U CN 201921797178 U CN201921797178 U CN 201921797178U CN 210993719 U CN210993719 U CN 210993719U
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Abstract
The utility model belongs to the technical field of white smoke elimination and flue gas deacidification, and relates to a white smoke elimination-flue gas deacidification integrated treatment system and a treatment method thereof. White cigarette is with air supply system and white cigarette air heater that disappears in white cigarette-flue gas deacidification integrated processing system is connected, be provided with high temperature flue gas input pipeline, medium temperature flue gas output pipeline and preheated air output pipeline on the white cigarette air heater that disappears, flue gas deacidification system top is provided with the chimney that is used for eliminating the emission of white hot flue gas, preheated air output pipeline is linked together with the chimney, medium temperature flue gas output pipeline and flue gas deacidification headtotail, alkali lye circulation system is provided with alkali lye input pipeline, circulation alkali lye pipeline and outer alkali lye pipeline of arranging, alkali lye input pipeline and flue gas deacidification headtotail, circulation alkali lye pipeline and flue gas deacidification headtotail. The utility model discloses simple process, the operation is effectual can be stable for a long time, and operating cost is low, and equipment investment is low, and is economical feasible.
Description
Technical Field
The utility model belongs to the technical field of white smoke disappears and flue gas deacidification, a white smoke disappears-flue gas deacidification integration processing system is related to, more specifically is a white smoke disappears-flue gas deacidification integration processing system.
Background
The existing white smoke elimination technology, namely smoke condensation reheating treatment, is a process technology additionally added after a smoke wet deacidification process, and the smoke deacidification and white smoke elimination process is not integrally considered and designed. However, at present, in various enterprises in various industries, the temperature of flue gas at the outlet of a large number of conventional wet desulphurization devices is usually in the range of 50-60 ℃, because the temperature is higher, the moisture content of the flue gas is also higher, if the white smoke is treated by adopting a direct heating method, the flue gas must be heated to a very high temperature for emission, and according to calculation, the flue gas may need to be heated to 125 ℃ or even higher, which is unreasonable energy waste and is not preferable.
There is also an improved process flue gas which is cooled, condensed, dehumidified, heated to a small extent and then discharged. The quality of the discharged flue gas is improved to a certain extent, but the problems of large heat loss such as temperature reduction and temperature rise and high actual operation cost caused by overlarge power energy consumption exist in the process.
Meanwhile, in the whole process, the flue gas contains CO2、SOx、NOx、H2S, HCl, low-temperature acidic corrosion can be generated on the surface of the heat exchange element in the flue gas condensation process, and the condensation heat exchange element always works in a strong corrosion environment. If the condensing heat exchange element made of metal is adopted, the condensing heat exchange element is strongly corroded, and the safe, stable and efficient work cannot be guaranteed.
The deacidification tower is easy to separate out salt to cause scaling, the reaction effect of the alkali liquor and the acidic components in the flue gas is influenced, the operation stability of the deacidification tower is seriously reduced, and further the consumption of the alkali liquor and the treatment cost of the alkali circulating liquid are increased.
Still contain the dust in the flue gas, the dust is mixed with the condensation precipitation water, can block up the flue gas passageway, perhaps, the scale deposit on heat transfer element surface, and these all can make heat exchange efficiency worsen sharply, produce very big influence to whole condensation heat transfer. The fluoroplastic heat exchanger generally adopted in the industry has the problems of unsatisfactory heat exchange effect, high manufacturing cost, wide temperature application range and the like.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a white smoke that disappears-flue gas deacidification integration processing system solves condensation heat transfer component that exists among the prior art and is perishable, tower internals easily scale deposit, heat loss is big and the extravagant scheduling problem of energy.
The utility model discloses an implementation process as follows:
a white smoke elimination-flue gas deacidification integrated treatment system comprises a white smoke elimination air supply system, a white smoke elimination air preheater, a flue gas deacidification system and an alkali liquor circulation system; the air supply system for the white smoke that disappears is connected with white smoke air heater that disappears, it is provided with high temperature flue gas input pipeline, medium temperature flue gas output pipeline and preheated air output pipeline on the white smoke air heater to disappear, flue gas deacidification system top is provided with the chimney that is used for eliminating the emission of white hot flue gas, preheated air output pipeline is linked together with the chimney, medium temperature flue gas output pipeline and flue gas deacidification headtotail, alkali lye circulation system is provided with alkali lye input pipeline, circulation alkali lye pipeline and outer alkali lye pipeline of arranging, alkali lye input pipeline and flue gas deacidification headtotail, circulation alkali lye pipeline and flue gas deacidification headtotail.
Further, the air supply system for white smoke elimination comprises a fan and an air dust removal and purification device.
Further, the white smoke elimination air preheater is an air heat exchanger.
Further, the white smoke abatement air preheater is a tube and shell type air heat exchanger.
Further, the flue gas deacidification system comprises a circulating alkali liquor storage tank, a sprayer, a tower internal part and a demister, wherein the circulating alkali liquor storage tank is arranged at the bottom of the flue gas deacidification system, the sprayer is arranged in the middle of the flue gas deacidification system, and the demister is arranged on the upper portion of the flue gas deacidification system.
Further, the alkali liquor circulating system comprises an alkali liquor blending tank, an alkali liquor stirring circulating pump and an alkali liquor washing circulating pump.
Furthermore, temperature, pressure and flow monitoring devices are arranged on system pipelines of an air supply system for white smoke elimination, a white smoke elimination air preheater, a flue gas deacidification system and an alkali liquor circulating system; flue gas component analysis instruments are arranged on the pipelines of the high-temperature flue gas input pipeline, the medium-temperature flue gas output pipeline, the preheated air output pipeline and the chimney.
According to the treatment method of the white smoke elimination-flue gas deacidification integrated treatment system, air is conveyed to a white smoke elimination air preheater by a white smoke elimination air conveying system, preheated air is output after heat exchange, and the preheated air is conveyed to a chimney through a preheated air output pipeline and is discharged together with white smoke elimination; the high-temperature flue gas is conveyed to a white smoke elimination air preheater through a high-temperature flue gas input pipeline, medium-temperature flue gas is output after heat exchange, and the medium-temperature flue gas is conveyed to a flue gas deacidification system through a medium-temperature flue gas output pipeline; conveying alkali liquor to a flue gas deacidification system through an alkali liquor input pipeline by an alkali liquor circulating system, performing temperature reduction deacidification reaction on medium-temperature flue gas by spraying, continuously increasing the amount of circulating alkali liquor, keeping the liquid level of a circulating alkali liquor pool stable, returning the alkali liquor after temperature reduction deacidification reaction to the alkali liquor circulating system through a circulating alkali liquor pipeline, keeping the liquid level of the circulating alkali liquor pool stable, and discharging corresponding amount of alkali liquor; and the flue gas after the temperature reduction and deacidification reaction passes through a demister in a flue gas deacidification system and then is output as deacidified and demisted flue gas, and the deacidified and demisted flue gas is mixed with preheated air to form white heat eliminating flue gas which is discharged from a chimney at the top end of the flue gas deacidification system.
The treatment method of the white smoke eliminating-flue gas deacidification integrated treatment system specifically comprises the following steps:
(1) starting a fan, conveying normal-temperature and normal-pressure air into a white smoke elimination air preheater through an air dust removal purification device, exchanging heat with high-temperature smoke, and outputting preheated air, wherein the preheated air is conveyed into a chimney through a preheated air output pipeline; the high-temperature flue gas is conveyed into a white smoke elimination air preheater through a high-temperature flue gas input pipeline, and the medium-temperature flue gas is output after heat exchange with air;
(2) the medium-temperature flue gas is conveyed to the bottom of a flue gas deacidification system through a medium-temperature flue gas output pipeline, an alkali liquor circulating system conveys alkali liquor to a sprayer of the flue gas deacidification system through an alkali liquor input pipeline to carry out primary spraying rapid cooling deacidification reaction on the medium-temperature flue gas, the reaction temperature for removing polluting flue gas components is reached, the liquid level of an alkali liquor storage pool is maintained to be stable, the alkali liquor after the cooling deacidification reaction is collected in a circulating alkali liquor storage pool at the bottom of the flue gas deacidification system, and the alkali liquor returns to the alkali liquor circulating system again;
(3) the flue gas after the temperature reduction and deacidification reaction is lifted to the middle part of a flue gas deacidification system, and alkali liquor in a sprayer is used for carrying out secondary spraying on the flue gas to further reduce the temperature of the flue gas and carry out desulfurization reaction; maintaining the liquid level of the alkali liquor storage pool to be stable, collecting the alkali liquor after temperature reduction and deacidification reaction in a circulating alkali liquor storage pool at the bottom of the flue gas deacidification system, and returning the alkali liquor to the alkali liquor circulating system again through a circulating alkali liquor pipeline;
(4) and (3) continuously ascending the flue gas subjected to secondary spraying to a demister device part at the upper part of the flue gas deacidification system, demisting to ensure that the humidity of the flue gas reaches a saturated state, mixing the flue gas with the preheated air conveyed into the chimney in the step (1) through the chimney at the top of the flue gas deacidification system to ensure that the flue gas reaches an unsaturated state, and finally discharging.
Further, the temperature of the preheated air in the step (1) is 200-400 ℃, the temperature of the high-temperature flue gas is 300-500 ℃, and the mass percentage content of oxygen in the high-temperature flue gas is controlled to be 3-8%; the pressure drop of the white smoke elimination air preheater is less than 5 kPa; the temperature of the medium-temperature flue gas is 200-400 ℃; after the primary spraying and rapid cooling in the step (2), the temperature of the medium-temperature flue gas is reduced to 55 ℃.
The utility model discloses utilize the heat heating of high temperature flue gas "white cigarette of disappearing" air for, the flue gas after white cigarette of disappearing mixes with the deacidification mixes, improves the temperature to 120 ~ 150 ℃ (the temperature can be according to national, local fume emission standard requirement and decides). The utility model discloses characteristics are in the fume emission in-process, directly utilize the high temperature flue gas that needs to discharge to heat the air for white cigarette that disappears, and oxygen content control is very important in high temperature flue gas temperature control and the flue gas among the process. The utility model discloses the middle-high temperature flue gas is through preferred shell and tube type heat exchanger tube side, preheats and walks the heat exchanger shell side with the air. The temperature of the high-temperature flue gas is controlled, the inlet temperature of the flue gas in the white-removing flue gas preheater is 300-500 ℃, and the outlet temperature is 200-400 ℃. The oxygen content in the high-temperature flue gas is controlled to be 3-8%, and the oxygen content after the deacidification flue gas and the white smoke elimination air are mixed is controlled within the relevant national monitoring standard range, such as 10-12%. Air temperature control is used for white smoke elimination, ambient air is sent into a smoke preheater through a fan, exchanges heat with high-temperature smoke and is heated to 200-400 ℃. The white smoke elimination air preheater preferably adopts a shell-and-tube heat exchanger, has high pressure drop requirement,<5 kPa. The cooled flue gas temperature of the white smoke eliminating air preheater can be subjected to processes such as evaporation of concentrated brine or preheating recovery and the like for energy recovery. After the flue gas is discharged, the flue gas is quenched in a flue gas deacidification system (wet deacidification gas), and the temperature is rapidly reducedThe temperature is below 200 ℃, so that the formation of dioxin in the smoke is avoided. The flue gas deacidification system adopts circulation of alkali-containing solution with certain concentration, and CO in the alkali solution and the flue gas2、SOx、NOx、H2S, HCl, etc., to produce the corresponding salt. The alkali liquor can be prepared by adopting calcium carbonate, calcium bicarbonate or caustic soda, sodium carbonate and other medicaments. Because the flue gas has large water content, the concentration of the salt in the washing liquid can be kept stable in the washing process, the aggravation of the salt formation degree of the internal parts of the washing tower and the scale formation deterioration of the internal parts of the tower can be avoided, the absorption of the acid component of the circulating alkali liquor can be kept, the good deacidification effect can be kept, and the tower can stably run for a long time. The temperature of the circulating alkali liquor of the flue gas deacidification system is controlled to be above 35 ℃, and cannot be too low, otherwise, salt is easy to separate out, and the solubility of the salt is high when the temperature is kept at a certain temperature. The alkali liquor has good absorption effect, which needs to be determined according to the optimal reaction temperature of the alkali liquor and the optimal combination of salt solubility.
The utility model discloses an actively the effect:
(1) the flue gas deacidification and the white cigarette that disappears of white cigarette-flue gas deacidification integration processing system simple process utilize high temperature flue gas self to preheat the outer exhaust gas of arranging, simplify the deacidification greatly and disappear white cigarette process units, improve heat utilization efficiency, reduce auxiliary assembly investment cost.
(2) White smoke heat exchanger that disappears adopts conventional equipment material, reduces equipment corrosion degree, improve equipment life.
(3) Deacidify the tower among the processing system and be difficult for appearing the salinity, the difficult scale deposit of tower internals, the operation can be stable for a long time effectual.
(4) Processing system utilizes high temperature flue gas self heat, avoids the low temperature flue gas after the deacidification to heat with steam, improves process units's self heat utilization efficiency, reduces technology energy consumption.
(5) The processing system has simple and easy-to-use process design, and no longer specially sets up steam heating device to heat the low-temperature flue gas.
(6) High temperature among the processing system preheats the preferred shell and tube type heat exchanger of "white smoke disappears" air heater, belongs to conventional equipment, simple structure, and the material is with low costs, and with the flue gas heat transfer under the high temperature operating mode, acid corrosion in the reduction flue gas, the use cost who is different from the high temperature resistant fluorine plastic heat exchanger of white smoke that disappears of present industry general application greatly.
(7) The utility model discloses the high temperature flue gas that goes out behind the white smoke heat exchanger among the method can directly get into deacidification tower and carry out the rapid cooling, avoids the reformation of dioxin, reduces harmful component's in the flue gas content.
Drawings
Fig. 1 is a process schematic diagram of the white smoke abatement-flue gas deacidification integrated treatment system of the utility model.
Detailed Description
The present invention will be further described with reference to the following examples.
In order to solve the problems that condensation heat exchange elements are easy to corrode, tower internals are easy to scale, heat loss is large, energy is wasted and the like in the prior art, the utility model provides a white smoke and flue gas deacidification integrated treatment system. The white smoke-flue gas deacidification integrated treatment system has simple process, good operation effect, long-term stability, low operation cost, low equipment investment and economic feasibility.
Example 1
The white smoke abatement-flue gas deacidification integrated treatment system disclosed by the embodiment is shown in figure 1 and comprises a white smoke abatement air supply system, a white smoke abatement air preheater, a flue gas deacidification system and an alkali liquor circulation system; the air supply system for the white smoke that disappears is connected with white smoke air heater that disappears, it is provided with high temperature flue gas input pipeline, medium temperature flue gas output pipeline and preheated air output pipeline on the white smoke air heater to disappear, flue gas deacidification system top is provided with the chimney that is used for eliminating the emission of white hot flue gas, preheated air output pipeline is linked together with the chimney, medium temperature flue gas output pipeline and flue gas deacidification headtotail, alkali lye circulation system is provided with alkali lye input pipeline, circulation alkali lye pipeline and outer alkali lye pipeline of arranging, alkali lye input pipeline and flue gas deacidification headtotail, circulation alkali lye pipeline and flue gas deacidification headtotail. The air supply system for the white smoke elimination comprises a fan and an air dedusting and purifying device. The white smoke elimination air preheater is an air heat exchanger, and preferably a shell-and-tube heat exchanger. The flue gas deacidification system comprises a circulating alkali liquor storage tank, a sprayer, a tower internal part and a demister, wherein the circulating alkali liquor storage tank is arranged at the bottom of the flue gas deacidification system, the sprayer is arranged in the middle of the flue gas deacidification system, and the demister is arranged on the upper portion of the flue gas deacidification system. The alkali liquor circulating system comprises an alkali liquor blending tank, an alkali liquor stirring circulating pump and an alkali liquor washing circulating pump. Temperature, pressure and flow monitoring devices are arranged on system pipelines of an air supply system for white smoke elimination, a white smoke elimination air preheater, a flue gas deacidification system and an alkali liquor circulating system; flue gas component analysis instruments are arranged on the pipelines of the high-temperature flue gas input pipeline, the medium-temperature flue gas output pipeline, the preheated air output pipeline and the chimney.
Example 2
The treatment method of the white smoke abatement-flue gas deacidification integrated treatment system in the embodiment specifically comprises the following steps:
(1) starting a fan, conveying normal-temperature normal-pressure air into a white smoke elimination air preheater through an air dust removal and purification device, wherein the air volume of the normal-temperature normal-pressure air is 5000Nm3H, outputting preheated air with the temperature of 300 ℃ through heat exchange with the high-temperature flue gas, and conveying the preheated air into a chimney through a preheated air output pipeline; conveying high-temperature flue gas into a white smoke elimination air preheater through a high-temperature flue gas input pipeline, wherein the temperature of the high-temperature flue gas is 450 ℃, the pressure of the high-temperature flue gas is 10kPa, and the flue gas amount is 12000Nm3H, the mass percentage of oxygen is 5.5%, the water content is 5%, and medium-temperature flue gas with the temperature of 350 ℃ is output through heat exchange with air; pressure drop of the white smoke elimination air preheater<5kPa；
(2) The medium-temperature flue gas is conveyed to the bottom of a flue gas deacidification system through a medium-temperature flue gas output pipeline, an alkali liquor circulating system conveys alkali liquor to a sprayer of the flue gas deacidification system through an alkali liquor input pipeline to carry out primary spraying rapid cooling deacidification reaction on the medium-temperature flue gas, the temperature of the medium-temperature flue gas is reduced to 55 ℃, and pollution removal is achievedThe reaction temperature of the smoke components is as low as 30mg/m after the reaction of the acidic components in the medium-temperature smoke3(ii) a Maintaining the liquid level of the alkali liquor storage pool to be stable, monitoring the mass percentage concentration of the alkali liquor to be 5%, the pH value of the alkali liquor to be 6-8, and the circulation amount of the alkali liquor to be 1500m3And h, collecting the alkali liquor after the temperature reduction and deacidification reaction in a circulating alkali liquor storage pool at the bottom of the flue gas deacidification system, returning the alkali liquor to an alkali liquor preparation tank of an alkali liquor circulating system again through a circulating alkali liquor pipeline, discharging the circulating alkali liquor to a water treatment system, and discharging the circulating alkali liquor with the external discharge capacity of 600m3/h；
(3) The flue gas after temperature reduction and deacidification reaction rises to the middle part of a flue gas deacidification system, alkali liquor in a sprayer sprays the flue gas for the second time to further reduce the temperature of the flue gas to 35 ℃, and acid components in the flue gas are reduced to 10mg/m3The following; maintaining the liquid level of the alkali liquor storage tank to be stable, monitoring the mass percentage concentration of the alkali liquor to be 5%, the pH value of the alkali circulation to be 6-8, and the circulation quantity of the alkali circulation to be 400m3And h, collecting the alkali liquor after the temperature reduction and deacidification reaction in a circulating alkali liquor storage pool at the bottom of the flue gas deacidification system, returning the alkali liquor to an alkali liquor preparation tank of an alkali liquor circulating system again through a circulating alkali liquor pipeline, discharging the circulating alkali liquor to a water treatment system, and discharging the circulating alkali liquor with the external discharge capacity of 600m3/h；
(4) The flue gas after secondary spraying continuously rises to a demister device part at the upper part of the flue gas deacidification system, the flue gas humidity reaches a saturated state of 35 ℃ after demisting, the flue gas reaches an unsaturated state after being mixed with the preheated air with the temperature of 300 ℃ conveyed into the chimney in the step (1) through the chimney at the top of the flue gas deacidification system, white fog does not appear on site, and meanwhile, the acid component of the discharged flue gas is as low as that of the discharged flue gas<5mg/m3The mass percentage of the oxygen is 10.8 percent, and the requirement of corresponding smoke emission standard is met.
Example 3
The white smoke elimination-flue gas deacidification integrated treatment system comprises a white smoke elimination air supply system, a white smoke elimination air preheater, a flue gas deacidification system and an alkali liquor circulation system; the air supply system for the white smoke that disappears is connected with white smoke air heater that disappears, it is provided with high temperature flue gas input pipeline, medium temperature flue gas output pipeline and preheated air output pipeline on the white smoke air heater to disappear, flue gas deacidification system top is provided with the chimney that is used for eliminating the emission of white hot flue gas, preheated air output pipeline is linked together with the chimney, medium temperature flue gas output pipeline and flue gas deacidification headtotail, alkali lye circulation system is provided with alkali lye input pipeline, circulation alkali lye pipeline and outer alkali lye pipeline of arranging, alkali lye input pipeline and flue gas deacidification headtotail, circulation alkali lye pipeline and flue gas deacidification headtotail.
Example 4
The white smoke elimination-flue gas deacidification integrated treatment system comprises a white smoke elimination air supply system, a white smoke elimination air preheater, a flue gas deacidification system and an alkali liquor circulation system; the air supply system for the white smoke that disappears is connected with white smoke air heater that disappears, it is provided with high temperature flue gas input pipeline, medium temperature flue gas output pipeline and preheated air output pipeline on the white smoke air heater to disappear, flue gas deacidification system top is provided with the chimney that is used for eliminating the emission of white hot flue gas, preheated air output pipeline is linked together with the chimney, medium temperature flue gas output pipeline and flue gas deacidification headtotail, alkali lye circulation system is provided with alkali lye input pipeline, circulation alkali lye pipeline and outer alkali lye pipeline of arranging, alkali lye input pipeline and flue gas deacidification headtotail, circulation alkali lye pipeline and flue gas deacidification headtotail. The air supply system for the white smoke elimination comprises a fan and an air dedusting and purifying device.
Example 5
The white smoke elimination-flue gas deacidification integrated treatment system comprises a white smoke elimination air supply system, a white smoke elimination air preheater, a flue gas deacidification system and an alkali liquor circulation system; the air supply system for the white smoke that disappears is connected with white smoke air heater that disappears, it is provided with high temperature flue gas input pipeline, medium temperature flue gas output pipeline and preheated air output pipeline on the white smoke air heater to disappear, flue gas deacidification system top is provided with the chimney that is used for eliminating the emission of white hot flue gas, preheated air output pipeline is linked together with the chimney, medium temperature flue gas output pipeline and flue gas deacidification headtotail, alkali lye circulation system is provided with alkali lye input pipeline, circulation alkali lye pipeline and outer alkali lye pipeline of arranging, alkali lye input pipeline and flue gas deacidification headtotail, circulation alkali lye pipeline and flue gas deacidification headtotail. The air supply system for the white smoke elimination comprises a fan and an air dedusting and purifying device. The white smoke elimination air preheater is a shell-and-tube heat exchanger. The flue gas deacidification system comprises a circulating alkali liquor storage tank, a sprayer, a tower internal part and a demister, wherein the circulating alkali liquor storage tank is arranged at the bottom of the flue gas deacidification system, the sprayer is arranged in the middle of the flue gas deacidification system, and the demister is arranged on the upper portion of the flue gas deacidification system.
Example 6
The treatment method of the white smoke abatement-flue gas deacidification integrated treatment system in the embodiment specifically comprises the following steps:
(1) starting a fan, conveying normal-temperature and normal-pressure air into a white smoke elimination air preheater through an air dust removal purification device, exchanging heat with high-temperature smoke, and outputting preheated air, wherein the preheated air is conveyed into a chimney through a preheated air output pipeline; the high-temperature flue gas is conveyed into a white smoke elimination air preheater through a high-temperature flue gas input pipeline, and the medium-temperature flue gas is output after heat exchange with air;
(2) the medium-temperature flue gas is conveyed to the bottom of a flue gas deacidification system through a medium-temperature flue gas output pipeline, an alkali liquor circulating system conveys alkali liquor to a sprayer of the flue gas deacidification system through an alkali liquor input pipeline to carry out primary spraying rapid cooling deacidification reaction on the medium-temperature flue gas, the reaction temperature for removing polluting flue gas components is reached, the liquid level of an alkali liquor storage pool is maintained to be stable, the alkali liquor after the cooling deacidification reaction is collected in a circulating alkali liquor storage pool at the bottom of the flue gas deacidification system, and the alkali liquor returns to the alkali liquor circulating system again;
(3) the flue gas after the temperature reduction and deacidification reaction is lifted to the middle part of a flue gas deacidification system, and alkali liquor in a sprayer is used for carrying out secondary spraying on the flue gas to further reduce the temperature of the flue gas and carry out desulfurization reaction; maintaining the liquid level of the alkali liquor storage pool to be stable, collecting the alkali liquor after temperature reduction and deacidification reaction in a circulating alkali liquor storage pool at the bottom of the flue gas deacidification system, and returning the alkali liquor to the alkali liquor circulating system again through a circulating alkali liquor pipeline;
(4) and (3) continuously ascending the flue gas subjected to secondary spraying to a demister device part at the upper part of the flue gas deacidification system, demisting to ensure that the humidity of the flue gas reaches a saturated state, mixing the flue gas with the preheated air conveyed into the chimney in the step (1) through the chimney at the top of the flue gas deacidification system to ensure that the flue gas reaches an unsaturated state, and finally discharging.
Example 7
The treatment method of the white smoke abatement-flue gas deacidification integrated treatment system in the embodiment specifically comprises the following steps:
(1) starting a fan, conveying normal-temperature normal-pressure air into a white smoke elimination air preheater through an air dust removal and purification device, wherein the air volume of the normal-temperature normal-pressure air is 5000Nm3H, outputting preheated air with the temperature of 200 ℃ through heat exchange with the high-temperature flue gas, and conveying the preheated air into a chimney through a preheated air output pipeline; conveying high-temperature flue gas into a white smoke elimination air preheater through a high-temperature flue gas input pipeline, wherein the temperature of the high-temperature flue gas is 300 ℃, the pressure of the high-temperature flue gas is 10kPa, and the flue gas amount is 12000Nm3H, the mass percentage of oxygen is 3%, the water content is 5%, and the medium-temperature flue gas with the temperature of 200 ℃ is output through heat exchange with air; pressure drop of the white smoke elimination air preheater<5kPa；
(2) The medium-temperature flue gas is conveyed to the bottom of a flue gas deacidification system through a medium-temperature flue gas output pipeline, an alkali liquor circulating system conveys alkali liquor to a sprayer of the flue gas deacidification system through an alkali liquor input pipeline to carry out primary spraying rapid cooling deacidification reaction on the medium-temperature flue gas, the temperature of the medium-temperature flue gas is reduced to 55 ℃, the reaction temperature for removing polluting flue gas components is reached, and acid components in the medium-temperature flue gas after the reaction are reduced to 30mg/m3(ii) a Maintaining the liquid level of the alkali liquor storage pool to be stable, monitoring the mass percentage concentration of the alkali liquor to be 5%, the pH value of the alkali liquor to be 6-8, and the circulation amount of the alkali liquor to be 1500m3And h, collecting the alkali liquor after the temperature reduction and deacidification reaction in a circulating alkali liquor storage pool at the bottom of the flue gas deacidification system, returning the alkali liquor to an alkali liquor preparation tank of an alkali liquor circulating system again through a circulating alkali liquor pipeline, discharging the circulating alkali liquor to a water treatment system, and discharging the circulating alkali liquor with the external discharge capacity of 600m3/h；
(3) The flue gas after temperature reduction and deacidification reaction rises to the middle part of a flue gas deacidification system, alkali liquor in a sprayer sprays the flue gas for the second time to further reduce the temperature of the flue gas to 35 ℃, and acid components in the flue gas are reduced to 10mg/m3The following; maintaining the liquid level of the alkali liquor storage tank to be stable, monitoring the mass percentage concentration of the alkali liquor to be 5%, the pH value of the alkali circulation to be 6-8, and the circulation quantity of the alkali circulation to be 400m3And h, collecting the alkali liquor after the temperature reduction and deacidification reaction in a circulating alkali liquor storage pool at the bottom of the flue gas deacidification system, returning the alkali liquor to an alkali liquor preparation tank of an alkali liquor circulating system again through a circulating alkali liquor pipeline, discharging the circulating alkali liquor to a water treatment system, and discharging the circulating alkali liquor with the external discharge capacity of 600m3/h；
(4) The flue gas after secondary spraying continuously rises to a demister device part at the upper part of the flue gas deacidification system, the flue gas humidity reaches a saturated state of 35 ℃ after demisting, the flue gas reaches an unsaturated state after being mixed with the preheated air with the temperature of 200 ℃ conveyed into the chimney in the step (1) through the chimney at the top of the flue gas deacidification system, white mist does not appear on site, and meanwhile, the acid component of the discharged flue gas is as low as that of the discharged flue gas<5mg/m3The mass percentage of the oxygen is 10.8 percent, and the requirement of corresponding smoke emission standard is met.
Example 8 this example was written to check the validity of the data, as the end-point values of the value ranges presented in the claims must be present in the example.
The treatment method of the white smoke abatement-flue gas deacidification integrated treatment system in the embodiment specifically comprises the following steps:
(1) starting a fan, conveying normal-temperature normal-pressure air into a white smoke elimination air preheater through an air dust removal and purification device, wherein the air volume of the normal-temperature normal-pressure air is 5000Nm3H, outputting preheated air with the temperature of 400 ℃ through heat exchange with the high-temperature flue gas, and conveying the preheated air into a chimney through a preheated air output pipeline; conveying high-temperature flue gas into a white smoke elimination air preheater through a high-temperature flue gas input pipeline, wherein the temperature of the high-temperature flue gas is 500 ℃, the pressure of the high-temperature flue gas is 10kPa, and the flue gas amount is 12000Nm3H, 8 percent of oxygen by mass and 5 percent of water by mass, and the output temperature is 300 ℃ after heat exchange with airWarming the flue gas; pressure drop of the white smoke elimination air preheater<5kPa；
(2) The medium-temperature flue gas is conveyed to the bottom of a flue gas deacidification system through a medium-temperature flue gas output pipeline, an alkali liquor circulating system conveys alkali liquor to a sprayer of the flue gas deacidification system through an alkali liquor input pipeline to carry out primary spraying rapid cooling deacidification reaction on the medium-temperature flue gas, the temperature of the medium-temperature flue gas is reduced to 55 ℃, the reaction temperature for removing polluting flue gas components is reached, and acid components in the medium-temperature flue gas after the reaction are reduced to 30mg/m3(ii) a Maintaining the liquid level of the alkali liquor storage pool to be stable, monitoring the mass percentage concentration of the alkali liquor to be 5%, the pH value of the alkali liquor to be 6-8, and the circulation amount of the alkali liquor to be 1500m3And h, collecting the alkali liquor after the temperature reduction and deacidification reaction in a circulating alkali liquor storage pool at the bottom of the flue gas deacidification system, returning the alkali liquor to an alkali liquor preparation tank of an alkali liquor circulating system again through a circulating alkali liquor pipeline, discharging the circulating alkali liquor to a water treatment system, and discharging the circulating alkali liquor with the external discharge capacity of 600m3/h；
(3) The flue gas after temperature reduction and deacidification reaction rises to the middle part of a flue gas deacidification system, alkali liquor in a sprayer sprays the flue gas for the second time to further reduce the temperature of the flue gas to 35 ℃, and acid components in the flue gas are reduced to 10mg/m3The following; maintaining the liquid level of the alkali liquor storage tank to be stable, monitoring the mass percentage concentration of the alkali liquor to be 5%, the pH value of the alkali circulation to be 6-8, and the circulation quantity of the alkali circulation to be 400m3And h, collecting the alkali liquor after the temperature reduction and deacidification reaction in a circulating alkali liquor storage pool at the bottom of the flue gas deacidification system, returning the alkali liquor to an alkali liquor preparation tank of an alkali liquor circulating system again through a circulating alkali liquor pipeline, discharging the circulating alkali liquor to a water treatment system, and discharging the circulating alkali liquor with the external discharge capacity of 600m3/h；
(4) The flue gas after secondary spraying continuously rises to a demister device part at the upper part of the flue gas deacidification system, the flue gas humidity reaches a saturated state of 35 ℃ after demisting, the flue gas reaches an unsaturated state after being mixed with the preheated air with the temperature of 400 ℃ conveyed into the chimney in the step (1) through the chimney at the top of the flue gas deacidification system, white fog does not appear on site, and meanwhile, the acid component of the discharged flue gas is as low as that of the discharged flue gas<5mg/m3The mass percentage of the oxygen is 10.8 percent, and the requirement of corresponding smoke emission standard is met.
In the utility model, the white smoke elimination air preheater selects a shell-and-tube heat exchanger; the air dust removal and purification device, the fan and the white smoke elimination air preheater are purchased, the smoke deacidification system belongs to a common desulfurization tower comprising a circulating alkali liquor storage tank, a sprayer, tower internals, a demister and the like, an alkali liquor circulating system is also used, an alkali liquor stirring circulating pump is used for stirring alkali liquor in an alkali liquor blending tank, the alkali liquor is supplied to the smoke deacidification system for spraying through an alkali liquor washing circulating pump, the structure is simpler, and the related temperature, pressure, flow monitoring device and smoke component analysis instrument also belong to common industrial devices; in the method of the invention the polluting flue gas component comprises CO2、SOx、NOx、H2S, HCl, etc. The white smoke-flue gas deacidification integrated treatment system of the utility model can be completely repeated by the technical personnel in the field according to the records of the application document, and the treatment effect can also reach the effect of the utility model.
The utility model discloses because of containing certain water in the flue gas in the method, after the flue gas reacted with the circulation alkali lye of flue gas deacidification system, constantly increased circulation alkali lye volume, the liquid level in circulation alkali lye pond need to keep stable, arrange corresponding 600m outward3The amount of salt generated by reaction is matched with the increased water amount, the salt concentration in the circulating alkali liquor is not increased any more in the long-term and running process, less salt precipitation and scaling of the circulating liquid on the internal parts of the tower in a long running period are ensured, and the sufficient contact effect of the alkali liquor and the flue gas is ensured, so that the running and maintenance costs are greatly reduced.
Furthermore, the utility model discloses in because of the white smoke air preheater of disappearing is gaseous form with the acidic material in the flue gas under the high temperature condition, to the corruption greatly reduced of material, can select to use ordinary carbon steel material during equipment manufacturing. The high-temperature flue gas and the air exchange heat, and the metal heat exchange medium greatly improves the heat exchange effect of the flue gas and the air under the high-temperature condition and reduces the use of equipment materials. The equipment adopts the structural form of a conventional tubular heat exchanger, the equipment is mature in design, the manufacturing process is simple, the material price is low, and the investment cost of the equipment of the white smoke abatement air preheater is more economic and reliable compared with that of the conventional white smoke abatement fluoroplastic heat exchanger. The utility model discloses the method is because of this technology high temperature flue gas behind the preheated air, through the rapid cooling of flue gas deacidification system, has hindered the resynthesis of harmful components such as dioxin in the flue gas greatly, reduces the content of harmful components in the outer row flue gas of arranging.
The hot air for the white smoke is mixed with the discharged smoke of the smoke deacidification system, the temperature of the mixed smoke is controlled to be 120-150 ℃ (the temperature range is adjustable and is determined according to the national and local smoke discharge requirements), wherein special attention needs to be paid to the fact that the data conversion value of on-line analysis and monitoring meets the national environmental protection requirements due to the fact that the oxygen concentration (10-12%) in the smoke is ensured.
The foregoing is a more detailed description of the invention, taken in conjunction with the specific preferred embodiments, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of conceiving, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (7)
1. The utility model provides a white cigarette-flue gas deacidification integration processing system that disappears which characterized in that: comprises an air supply system for white smoke elimination, a white smoke elimination air preheater, a flue gas deacidification system and an alkali liquor circulation system; the air supply system for the white smoke that disappears is connected with white smoke air heater that disappears, it is provided with high temperature flue gas input pipeline, medium temperature flue gas output pipeline and preheated air output pipeline on the white smoke air heater to disappear, flue gas deacidification system top is provided with the chimney that is used for eliminating the emission of white hot flue gas, preheated air output pipeline is linked together with the chimney, medium temperature flue gas output pipeline and flue gas deacidification headtotail, alkali lye circulation system is provided with alkali lye input pipeline, circulation alkali lye pipeline and outer alkali lye pipeline of arranging, alkali lye input pipeline and flue gas deacidification headtotail, circulation alkali lye pipeline and flue gas deacidification headtotail.
2. The integrated processing system for eliminating white smoke and deacidifying flue gas according to claim 1, wherein: the air supply system for the white smoke elimination comprises a fan and an air dedusting and purifying device.
3. The integrated processing system for eliminating white smoke and deacidifying flue gas according to claim 1, wherein: the white smoke eliminating air preheater is an air heat exchanger.
4. The white smoke elimination-flue gas deacidification integrated processing system according to claim 3, wherein: the white smoke abatement air preheater is a tube and shell type air heat exchanger.
5. The integrated processing system for eliminating white smoke and deacidifying flue gas according to claim 1, wherein: the flue gas deacidification system comprises a circulating alkali liquor storage tank, a sprayer, a tower internal part and a demister, wherein the circulating alkali liquor storage tank is arranged at the bottom of the flue gas deacidification system, the sprayer is arranged in the middle of the flue gas deacidification system, and the demister is arranged on the upper portion of the flue gas deacidification system.
6. The integrated processing system for eliminating white smoke and deacidifying flue gas according to claim 1, wherein: the alkali liquor circulating system comprises an alkali liquor blending tank, an alkali liquor stirring circulating pump and an alkali liquor washing circulating pump.
7. The integrated processing system for eliminating white smoke and deacidifying flue gas according to claim 1, wherein: temperature, pressure and flow monitoring devices are arranged on system pipelines of an air supply system for white smoke elimination, a white smoke elimination air preheater, a flue gas deacidification system and an alkali liquor circulating system; flue gas component analysis instruments are arranged on the pipelines of the high-temperature flue gas input pipeline, the medium-temperature flue gas output pipeline, the preheated air output pipeline and the chimney.
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| CN110585885A (en) * | 2019-10-24 | 2019-12-20 | 陕西正本环境工程有限公司 | White smoke eliminating-flue gas deacidification integrated treatment system and treatment method thereof |
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| CN110585885A (en) * | 2019-10-24 | 2019-12-20 | 陕西正本环境工程有限公司 | White smoke eliminating-flue gas deacidification integrated treatment system and treatment method thereof |
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