CN211585963U - Purification treatment device for waste incineration flue gas - Google Patents
Purification treatment device for waste incineration flue gas Download PDFInfo
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Abstract
The utility model belongs to the technical field of msw incineration flue gas handles, concretely relates to purification unit of msw incineration flue gas. The purification treatment device of waste incineration flue gas includes: the device comprises an evaporator, a cyclone dust collector, an SCR system, an economizer, a semidry deacidification system, an active carbon injection system and a bag type dust removal system which are sequentially connected. The utility model carries out SCR denitration on the waste incineration flue gas at a specific site, namely between the evaporator and the economizer, thereby not only saving the investment and the occupied area of two-stage GGH and one-stage SGH in the existing purification treatment process, but also saving the steam consumption for heating the flue gas; in addition, the problems of scale increase and investment increase of SCR facilities are avoided, and the ammonia escape amount of the whole system is reduced, so that the process is more energy-saving and environment-friendly.
Description
Technical Field
The utility model belongs to the technical field of msw incineration flue gas handles, concretely relates to purification unit of msw incineration flue gas.
Background
With the increasing of the output of municipal solid waste, the recycling, harmlessness and reduction of the waste become more and more important. Among a plurality of garbage disposal modes such as landfill, compost and the like, the household garbage incineration power generation not only can reduce the garbage, but also can use the heat energy generated by the garbage incineration for power generation, and is an important household garbage disposal mode.
The smoke generated by burning the household garbage contains a large amount of HF, HCl and SO2、NOxAcid gases, dust, water vapor, dioxins, etc.; wherein, the dust contains metal or heavy metal oxide such as ferric oxide, thallium dioxide, aluminum oxide, etc., and the processing difficulty is very large. In order to meet the increasingly strict national and local waste incineration flue gas emission standard, reduce the harm to the surrounding environment and reduce the complaints of nearby residents, the purification treatment process adopted by the waste incineration flue gas is very complicated, and the operation and investment cost is high.
The existing purification treatment method of waste incineration flue gas mainly adopts a mode of combining selective non-catalytic reduction (SNCR) and selective catalytic reduction denitration (SCR) processes for denitration, but because the flue gas discharged from a waste heat boiler contains harmful impurities (such as heavy metals and the like) which can easily deactivate a catalyst, the flue gas is usually subjected to deacidification, dedusting and other treatments and then subjected to SCR denitration treatment, namely the SCR treatment is usually used as the tail end of the waste incineration flue gas purification treatment process.
For example, patent CN206652386U discloses a process of "selective non-catalytic reduction (SNCR) + semi-dry (rotary spray) deacidification + activated carbon spray adsorption (dioxin removal) + cloth bag dust removal + flue gas reflux device + wet deacidification + GGH (flue gas/flue gas heat exchanger) + SGH (flue gas/steam heat exchanger) + selective catalytic reduction denitration (SCR)" to purify flue gas, so as to reach national and local emission standards.
The process firstly removes 30-50% of NO in the flue gas by SNCRxThen removing acid gas in the flue gas by semidry deacidification and wet deacidification, adsorbing dioxin and partial heavy metal in the flue gas by active carbon injection, and continuously removing the dioxin and partial heavy metal by cloth bagsThe dust in the flue gas is removed by a dust collector, and the residual NO in the flue gas is finally removed by SCRxAnd discharging after reaching the standard. The process comprises the steps of adding two-stage GGH and one-stage SGH after wet deacidification, gradually increasing the temperature of flue gas at about 100 ℃ to 250-300 ℃ in a flue gas heat exchange and steam heating mode, and then entering an SCR reactor for denitration reaction.
However, the purification treatment method in which the SCR reactor is arranged at the end of the whole flue gas purification process has several problems:
(1) because two stages of GGHs and one stage of SGHs are required to be arranged, the heat exchanger and the steam heater have high investment and large occupied area, and the steam heating cost is high, so that the total power generation amount and the overall economic benefit of a waste incineration plant are influenced, and the ton treatment cost of the waste is increased by about 20%;
(2) as the process links are excessive, and the SCR reactor is arranged at the tail end of the process, the spraying of cooling water and the air leakage quantity of the system are gradually increased along with the increase of the process links, so that the total quantity of the flue gas treated at the tail end is increased by about 50 percent compared with the outlet of a hearth, and the volume, the investment, the catalyst consumption and the like of the SCR reactor are greatly increased;
(3) because the SCR reactor of the process is arranged at the tail end of the process, and the corresponding catalyst is also arranged at the tail end of the system, in order to reduce the use amount of steam (for SGH), a medium-low temperature catalyst with a temperature window of 200-300 ℃ needs to be used; the price of the medium-low temperature catalyst is about 1.5-2 times of that of the medium-high temperature catalyst (the temperature window is 300-420 ℃), so that the investment of the whole process is increased;
(4) compared with a medium-high temperature catalyst (the temperature window is 300-420 ℃), the medium-low temperature catalyst has low reactivity and efficiency, so that ammonia escapes greatly and the environment is polluted.
In addition, although the prior art also has a process of arranging the SCR between the economizer and the air preheater to carry out medium-high temperature denitration treatment on the flue gas, the prior art is mainly applied to flue gas purification of coal-fired power plants. Because the waste incineration flue gas contains a large amount of heavy metals such as GeO which are different from the components of the flue gas of a coal-fired power plant2、Y2O3And Rb2O, etc., and about 20% water vapor (electricity)The water content in the flue gas of the plant is only 6-8%), which causes great treatment difficulty and can not directly apply the high-temperature high-dust arrangement SCR process method suitable for the coal-fired power plant to the treatment of the waste incineration flue gas.
In view of this, the present application is specifically made.
SUMMERY OF THE UTILITY MODEL
In order to overcome the technical problem, the application provides a novel method for purifying and treating waste incineration flue gas.
In addition, this application still provides a purification unit of msw incineration flue gas.
The method for purifying and treating the waste incineration flue gas comprises the following steps: the flue gas is led out from the evaporator, is treated by the processes of cyclone dust removal, SCR denitration, a coal economizer, semi-dry deacidification, activated carbon adsorption and bag type dust removal, and is purified and discharged.
The utility model carries out SCR denitration reaction on the waste incineration flue gas at a specific site (between an evaporator and an economizer), and because the flue gas temperature (300-420 ℃) at the site is the most suitable temperature for medium-high temperature denitration, the investment and the occupation of land of two-stage GGH and one-stage SGH which are used for flue gas temperature rise and are arranged in the existing purification treatment process are saved, and the steam consumption for flue gas heating is also saved; in addition, the problems of scale increase and investment increase of SCR facilities are avoided, and the ammonia escape amount of the whole system is reduced, so that the process is more environment-friendly. Experiments show that the purification treatment method can obviously improve the SCR denitration efficiency.
According to some embodiments of the present application, the reaction temperature of the SCR denitration is 300-. Research shows that in the temperature interval, the SCR denitration efficiency is highest, and the flue gas treatment effect is best.
According to some embodiments of the present application, the catalyst used for SCR denitration is selected from medium-high temperature catalysts, preferably honeycomb homogeneous microporous thin-walled catalysts, characterized by the following: the number of holes is 18-50, the wall thickness is 0.4-1.3 cm, the specific surface area is 400-2/m3The pore volume is more than or equal to 0.25cm3The pore diameter is more than or equal to 35nm, the longitudinal compressive strength is 2000-2200KPa, and the transverse compressive strength is 600-700 KPa. For example, middle power saving sixA catalyst specially used for garbage incineration produced by Hetianyu (Shandong) catalyst Co. Meanwhile, in order to obtain better effect, catalyst supporting equipment can also be used, such as the equipment described in CN206622113U and CN 206604507U.
Researches show that the catalyst can exert the optimal catalytic activity at the temperature of 300-420 ℃, the denitration efficiency is obviously improved, and experience proves that the actual denitration efficiency can reach 80-95%. Meanwhile, compared with a low-temperature catalyst, in the method, the production cost of the catalyst adopted by each cube can be reduced by about 30-40%, and the investment of the whole process is obviously reduced.
According to some embodiments of the present application, NH during the SCR denitration process3With NOxThe molar ratio of (1.0-1.5) to (1); research shows that under the proportional condition, the SCR denitration efficiency is further improved.
According to some embodiments of the present application, in the SCR denitration, the reducing agent is selected from liquid ammonia, urea, or ammonia water. When liquid ammonia or urea is used as a reducing agent, the generated ammonia gas and air need to be uniformly mixed, and the ammonia gas and the air are sprayed into the flue in the form of ammonia-air mixed gas. When ammonia water is used as a reducing agent, the ammonia water can be directly sprayed into a flue by using a two-fluid spray gun.
According to some embodiments of the present application, NO in the inlet flue gas of the SCR denitration processxThe concentration is 250-500mg/Nm3NO in outlet flue gasxThe concentration is 30-100mg/Nm3(oxygen content as 11% conversion); and in the SCR denitration process, the ammonia escape rate is less than or equal to 2.5 ppm. Research shows that by adopting the purification treatment process, ammonia escape can be effectively controlled, and NO in flue gas can be remarkably reducedxThereby obtaining excellent denitration effect.
According to some embodiments of the present application, the cyclone dust removal removes dust at a high temperature of 300-400 ℃ and the dust removal efficiency is greater than or equal to 45%. Research shows that before SCR denitration, the dust content in flue gas is reduced, the service life of a catalyst can be effectively prolonged, the heat exchange efficiency of an economizer can be improved, the operation cost can be reduced, and the comprehensive benefit can be improved.
The purification treatment method is suitable for various waste incineration smoke, and is particularly suitable for smoke generated by household waste incineration. Researches find that the purification treatment difficulty of the household garbage incineration flue gas is often higher than that of other flue gas, and the main reason is that the household garbage incineration flue gas contains some special heavy metals, such as GeO2、Y2O3And Rb2O, and the like, and about 20% of water vapor (the water content in the flue gas of the power plant is only 6-8%), which cause great treatment difficulty, and the conventional high-temperature and high-dust SCR process method is difficult to effectively purify or has high cost, so that the method is not suitable for industrial treatment.
In a specific embodiment of the present application, the flue gas from incineration of domestic waste contains: the dust amount is 2500-3800mg/Nm3Containing up to 20% of water and also highly corrosive HF, HCl gas, and SO2And heavy metals (e.g. GeO)2、Y2O3And Rb2O, etc.) and the like.
As a specific embodiment of the present application, the composition of the flue gas is as follows: water content of 18-22%, dust content of 2500-3Containing HCl 1000-1500mg/Nm3Containing SO2300-700mg/Nm3Containing NOx250-500mg/Nm3Dioxin 2-5ngTEQ/Nm3(ii) a Wherein the dust in the flue gas contains CaO, MgO and TiO2、MnO、GeO2、Rb2O、Sb2O3And the like alkali metal and heavy metal oxides. Tests prove that the purification treatment method can remarkably reduce the comprehensive cost while ensuring the purification effect.
It should be noted that, for the established waste incineration plant, the purification treatment method further comprises the step of carrying out SNCR denitration in a hearth before the flue gas enters the evaporator, so that the urea injection amount required by the SNCR is reduced, and the alkali corrosion is avoided. In the process, the flue gas subjected to SNCR denitration treatment is led out of an evaporator, and is subjected to rotary dust removal, SCR denitration, economizer temperature reduction and heat exchange and semi-dry deacidification (SO)2、NOxHCl, HF and the like), and the flue gas can be removed by adsorbing and removing dioxin by active carbon and performing bag type dust removalDischarging after reaching the standard.
And for newly-built waste incineration plants, the SNCR does not need to be built, the SCR denitration process can be directly arranged between the evaporator and the economizer in the boiler, and the flue gas led out by the evaporator is subjected to SCR denitration. Research shows that the temperature interval of the point (between the evaporator and the economizer) is the interval with the highest activity and denitration efficiency of the medium-high temperature denitration catalyst, and the denitration efficiency can reach 80-95%.
The working principle of the purification treatment method is as follows: leading out the flue gas from the evaporator, removing a certain amount of smoke dust through cyclone dust removal, carrying out SCR denitration treatment at the temperature of 300-420 ℃ under the action of a medium-high temperature catalyst, and then entering an economizer for heat exchange and temperature reduction; in the process, the dedusting amount of cyclone dedusting is reasonably controlled, so that on the premise of not increasing the operation cost, the SCR denitration efficiency can be improved, on the other hand, the heat exchange efficiency of the economizer can be improved, and multiple beneficial effects are achieved; meanwhile, SCR denitration is arranged between the evaporator and the economizer, the temperature of the area can be fully utilized, and matched catalysts are used, so that the SCR denitration efficiency is obviously improved; in addition, based on cyclone dust removal and SCR denitration treatment, the dust content in the flue gas entering the economizer is relatively lower, the heat exchange efficiency is improved, and the subsequent equipment dust blockage is reduced; finally, the flue gas is led out from the economizer and deacidified by a semidry method to remove acid gas (SO)2、NOxHCl, HF and the like) and activated carbon is sprayed to adsorb and remove dioxin and remove dust in a bag type to obtain gas meeting the emission requirement.
The application still provides a purification unit of msw incineration flue gas, includes: the device comprises an evaporator, a cyclone dust collector, an SCR system, an economizer, a semidry deacidification system, an active carbon injection system and a bag type dust removal system which are sequentially connected.
According to the SCR denitration system, the SCR system is arranged between the evaporator and the economizer, and SCR denitration is carried out by utilizing a temperature area between the evaporator and the economizer, so that the denitration efficiency can be obviously improved; meanwhile, the investment and the occupied area of two-stage GGH and one-stage SGH in the existing purification treatment process are saved, and the steam consumption for heating the flue gas is reduced; in addition, the problems of scale increase and investment increase of SCR facilities are avoided, and the ammonia escape amount of the whole system is reduced, so that the process is more environment-friendly.
According to some embodiments of the application, the SCR system comprises: an SCR reactor; the denitration reducing agent storage and injection system is connected with the SCR reactor pipeline and is used for supplying and injecting the reducing agent; the ash cleaning and blowing system is connected with the SCR reactor through a pipeline and is used for cleaning dust in the SCR reactor; and a catalyst.
The denitration reducing agent storage and injection system comprises: a reductant storage system and a reductant injection system; the reducing agent may be liquid ammonia, urea, or ammonia.
Wherein, when using liquid ammonia as reductant, denitration reductant storage injection system mainly includes: the device comprises a liquid ammonia storage system, a liquid ammonia evaporation system, an ammonia-air mixer and an ammonia injection grid.
When urea is used as a reducing agent, the denitration reducing agent storage and injection system mainly comprises: the system comprises a urea solution preparation and storage system, a urea hydrolysis (pyrolysis) system, an ammonia air mixer and an ammonia spraying grid.
When using aqueous ammonia as the reductant, denitration reductant storage injection system mainly includes: ammonia water storage system, ammonia water evaporimeter system, ammonia water spray gun.
The deashing soot-blowing system includes: a sound wave ash cleaning system and a steam ash blowing system.
The catalyst is selected from medium-high temperature catalysts, preferably honeycomb homogeneous micropore thin-wall catalysts, and is characterized in that: the number of holes is 18-50, the wall thickness is 0.4-1.3 cm, the specific surface area is 400-2/m3The pore volume is more than or equal to 0.25cm3The pore diameter is more than or equal to 35nm, the longitudinal compressive strength is 2000-2200KPa, and the transverse compressive strength is 600-700 KPa. For example, a catalyst dedicated to incineration of garbage produced by Zhongjieyianghua (Shandong) catalyst Co. Meanwhile, in order to obtain better effect, catalyst supporting equipment can also be used, such as the equipment described in CN206622113U and CN 206604507U.
In addition, a main fan and a chimney are connected to a discharge port pipeline of the bag-type dust removal system; and the bottom of the semidry deacidification system, the bottom of the cyclone dust collector and the bottom of the bag type dust removal system are connected with ash bins.
Compared with the prior waste incineration flue gas purification process, the method has the following advantages:
(1) the investment and the occupied area of two stages of GGHs and one stage of SGHs are saved; taking a 400t/d waste incineration plant as an example, the investment can be saved by about 300 ten thousand, and the occupied area of a factory building can be saved by 200m2The process arrangement is more concise and compact;
(2) the GGH and SGH are saved, and the steam consumption for heating the flue gas is also saved; taking a 400t/d scale waste incineration plant as an example, the annual operating cost can be reduced by about 440 ten thousand yuan, so that the process is more energy-saving;
(3) the SCR system is arranged at the foremost end of the waste incineration flue gas purification process, so that the conditions that the scale of an SCR facility is increased and the investment is increased due to the fact that the air leakage amount is gradually increased and the flue gas treatment amount is increased along with the increase of the process length at the rear end are avoided; taking a 400t/d waste incineration plant as an example, the SCR system is arranged at the front end with the smoke treatment capacity of about 50000Nm3H, if arranged at the back end (as in patent CN206652386U), the smoke amount may reach 80000 Nm3The occupied area and the volume of the single SCR reaction can be saved by 20 to 30 percent;
(4) as the SCR denitration efficiency can reach more than 80 percent within the range of 300-420 ℃, ammonia escaping to the SCR device without SNCR reaction can continue to react with NO under the action of the catalystxThe reaction reduces the ammonia escape amount of the whole system, and the process is more environment-friendly.
(5) According to the method, the medium-high temperature denitration catalyst at 300-420 ℃ is adopted, the denitration efficiency of the catalyst is high, and the cost of each cubic catalyst is reduced by about 30-40% compared with that of a low-temperature catalyst, so that the investment of the whole process is reduced, and the method is more economical.
Drawings
FIG. 1 is a process flow diagram of the purification treatment method of waste incineration flue gas according to the present application.
In the figure: the method comprises the following steps of 1-a waste incineration boiler, 2-SNCR denitration device, 3-an evaporator, 4-a cyclone dust collector, 5-a denitration reducing agent storage and injection system, 6-an SCR system, 7-an economizer, 8-a semi-dry deacidification system, 9-an activated carbon injection system, 10-a bag type dust removal system, 11-a main fan, 12-a chimney and 13-an ash bin.
Detailed Description
The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.
Taking an existing waste incineration plant (generally, an SNCR denitration device is already built) as an example, the process flow for treating waste incineration flue gas by using the waste incineration flue gas purification treatment method and the purification treatment device described in the present application is shown in fig. 1, and includes:
(1) after being led out by an SNCR denitration device 2 and an evaporator 3, the flue gas led out from the waste incineration boiler 1 is subjected to certain amount of smoke dust removal by a cyclone dust collector 4, SCR denitration treatment is carried out at the temperature of 300-420 ℃ under the action of a medium-high temperature catalyst, and then the flue gas enters an economizer for heat exchange and temperature reduction;
in the process, the reducing agent adopted by the SCR denitration can be ammonia gas or ammonia water; the reducing agent enters the flue through a denitration reducing agent storage and injection system 5;
when ammonia is used as a reducing agent, the ammonia generated by the ammonia storage unit is mixed with air in the ammonia-air mixer, is injected into the flue from the ammonia injection grid in the form of ammonia-air mixed gas, and is mixed with the flue gas subjected to cyclone dust removal to enter the SCR system 6;
when ammonia water is used as a reducing agent, the ammonia water is provided by the ammonia water storage and supply unit, is sprayed into the flue by using a spray gun, and is mixed with the flue gas subjected to cyclone dust removal to enter the SCR system 6;
(2) the flue gas after SCR denitration enters an economizer 7 for temperature reduction and heat exchange, and acid gas (SO) is removed through a semidry deacidification system 8 in sequence2、NOxHCl, HF and the like) is sprayed into the flue through an activated carbon spraying system 9 to remove dioxin, and is dedusted through a bag type dedusting system 10 to finally obtain clean flue gas meeting the emission requirement, and the clean flue gas is emitted from a chimney 12 through a main fan 11; the smoke dust removed in the cyclone dust collector 4, the semidry deacidification system 8 and the bag type dust removal system 10 is collected by an ash bin 13 to be processed in the next step。
For a newly-built waste incineration treatment plant, denitration in an SNCR furnace can be omitted, and a denitration treatment system is directly arranged between an evaporator and an economizer, wherein the specific process flow of the purification treatment method comprises the following steps:
(1) flue gas led out from the waste incineration boiler 1 enters a cyclone dust collector 4 through an evaporator 3 to remove a certain amount of smoke dust, SCR denitration treatment is carried out at the temperature of 300-420 ℃ under the action of a medium-high temperature catalyst, and then the flue gas enters an economizer 7 for heat exchange and temperature reduction;
in the process, the reducing agent adopted by the SCR denitration can be ammonia gas or ammonia water; the reducing agent enters the flue through a denitration reducing agent storage and injection system 5;
when ammonia is used as a reducing agent, the ammonia generated by the ammonia storage unit is mixed with air in the ammonia-air mixer, is injected into the flue from the ammonia injection grid in the form of ammonia-air mixed gas, and is mixed with the flue gas subjected to cyclone dust removal to enter the SCR system 6;
when ammonia water is used as a reducing agent, the ammonia water is provided by the ammonia water storage and supply unit, is sprayed into the flue by using a spray gun, and is mixed with the flue gas subjected to cyclone dust removal to enter the SCR system 6;
(2) the flue gas after SCR denitration enters an economizer 7 for temperature reduction and heat exchange, and acid gas (SO) is removed through a semidry deacidification system 8 in sequence2、NOxHCl, HF and the like) is sprayed into the flue through an activated carbon spraying system 9 to remove dioxin, and is dedusted through a bag type dedusting system 10 to finally obtain clean flue gas meeting the emission requirement, and the clean flue gas is emitted from a chimney 12 through a main fan 11; and the smoke dust removed in the cyclone dust collector 4, the semidry deacidification system 8 and the bag type dust removal system 10 is collected by an ash bin 13 for further treatment.
Example 1
This embodiment provides a purification unit of msw incineration flue gas, includes: the device comprises an evaporator, a cyclone dust collector, an SCR system, an economizer, a semidry deacidification system, an active carbon injection system and a bag type dust removal system which are sequentially connected.
Wherein the SCR system comprises: an SCR reactor; the denitration reducing agent storage and injection system is connected with the SCR reactor pipeline and is used for supplying and injecting the reducing agent; the ash cleaning and blowing system is connected with the SCR reactor through a pipeline and is used for cleaning dust in the SCR reactor; and an SCR catalyst.
The denitration reducing agent storage and injection system comprises: a reductant storage system and a reductant injection system; the reducing agent may be liquid ammonia, urea, or ammonia.
Wherein, when using liquid ammonia as reductant, denitration reductant storage injection system mainly includes: the device comprises a liquid ammonia storage system, a liquid ammonia evaporation system, an ammonia-air mixer and an ammonia injection grid.
When urea is used as a reducing agent, the denitration reducing agent storage and injection system mainly comprises: the device comprises a urea solution preparation and storage system, a urea hydrolysis (pyrolysis) system, an ammonia-air mixer and an ammonia spraying grid.
When using aqueous ammonia as the reductant, denitration reductant storage injection system mainly includes: ammonia water storage system, ammonia water evaporimeter system, ammonia water spray gun.
The deashing soot-blowing system includes: a sound wave ash cleaning system and a steam ash blowing system.
The SCR catalyst is a special catalyst for waste incineration produced by Zhongxiao Liuhe Tianyu (Shandong) catalyst Co., Ltd and is characterized by comprising the following components in parts by weight: the number of holes is 18-50, the wall thickness is 0.4-1.3 cm, the specific surface area is 400-2/m3The pore volume is more than or equal to 0.25cm3The pore diameter is more than or equal to 35nm, the longitudinal compressive strength is 2000-2200KPa, and the transverse compressive strength is 600-700 KPa.
The bag type dust removal system is a bag type dust remover.
In addition, a main fan and a chimney are connected to a discharge port pipeline of the bag-type dust removal system; and the bottom of the semidry deacidification system, the bottom of the cyclone dust collector and the bottom of the bag type dust removal system are connected with an ash bin.
Example 2
Taking a 400t/d garbage incineration plant as an example, the smoke components are shown in Table 1.
TABLE 1
Adopt this application purification unit carry out purification treatment, concrete step is as follows:
(1) the flue gas is led out from the evaporator at the flow velocity of 13m/s, and is dedusted by the cyclone deduster, and the dedusting efficiency is 50 percent;
(2) the flue gas after dust removal enters an SCR system, and is mixed with a reducing agent to carry out SCR denitration reaction;
wherein the reaction temperature of the SCR denitration is 350 ℃;
the catalyst adopted by the SCR denitration is a special catalyst for denitration of 18-hole waste incineration flue gas produced by Zhongxiao Liuhe Tian Huai (Shandong) catalyst company;
NH in the SCR denitration process3With NOxIn a molar ratio of 1.2: 1;
in the SCR denitration process, the adopted reducing agent is ammonia water solution with the mass concentration of 20%;
NO in inlet flue gas of SCR denitration processxThe concentration is 300mg/Nm3NO in outlet flue gasxThe concentration is 50mg/Nm3(ii) a And in the SCR denitration process, the escape rate of ammonia is less than or equal to 2.5 ppm.
(3) The flue gas after SCR denitration treatment enters a coal economizer for heat exchange, and then acid gas (SO) is removed through a semidry deacidification system2、NOxHCl, HF and the like) are sprayed into the flue through an activated carbon spraying system to remove dioxin, and the flue is dedusted through a bag type dedusting system to finally obtain clean flue gas meeting the emission requirement.
Compared with CN206652386U, on the premise that the purified flue gas meets the emission standard, the purification treatment method in the embodiment 1 of the application has the following advantages:
1) can save investment by at least 300 ten thousand and can save the floor area of a factory building by 200m2Above, make the process layoutThe device is more concise and compact;
2) the annual operating cost can be reduced by at least 440 ten thousand yuan, and the process is more energy-saving;
3) the SCR system is arranged at the front end of the system, and the smoke treatment capacity is about 50000Nm3H, whereas the smoke volume of comparative example 1 may reach 80000 Nm3The occupied area and the volume of the single SCR reaction can be saved by 20 to 30 percent;
4) ammonia slip to the SCR device without SNCR reaction can continue to react with NO under the action of the catalystxThe ammonia escape amount of the whole system is reduced, so that the process is more environment-friendly;
5) compared with the low-temperature catalyst, the cost of each cubic catalyst in the embodiment 1 is reduced by about 30-40%, so that the investment of the whole process is reduced.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The utility model provides a purification unit of msw incineration flue gas which characterized in that includes: the device comprises an evaporator, a cyclone dust collector, an SCR system, an economizer, a semidry deacidification system, an active carbon injection system and a bag type dust removal system which are sequentially connected.
2. The purification treatment apparatus according to claim 1, wherein the SCR system comprises:
an SCR reactor;
the denitration reducing agent storage and injection system is connected with the SCR reactor pipeline and is used for supplying and injecting the reducing agent;
the ash cleaning and blowing system is connected with the SCR reactor through a pipeline and is used for cleaning dust in the SCR reactor;
and a catalyst.
3. The purification treatment apparatus according to claim 2, wherein the denitration reducing agent storage injection system includes: a reductant storage system and a reductant injection system; the reducing agent used by the reducing agent storage system is selected from liquid ammonia, urea or ammonia water.
4. The purification treatment apparatus according to claim 3, wherein the denitration reducing agent storage and injection system includes, when the liquid ammonia is used as the reducing agent: the device comprises a liquid ammonia storage system, a liquid ammonia evaporation system, an ammonia-air mixer and an ammonia injection grid.
5. The purification treatment apparatus according to claim 3, wherein the denitration reducing agent storage and injection system includes, when the urea is used as the reducing agent: the system comprises a urea solution preparation and storage system, a urea hydrolysis/pyrolysis system, an ammonia air mixer and an ammonia spraying grid.
6. The purification treatment apparatus according to claim 3, wherein the denitration reducing agent storage and injection system includes, when the ammonia water is used as the reducing agent: ammonia water storage system, ammonia water evaporimeter system and ammonia water spray gun.
7. The cleaning treatment apparatus of claim 2, wherein the ash removal soot blowing system comprises: a sound wave ash cleaning system and a steam ash blowing system.
8. The purification treatment apparatus of claim 2, wherein the catalyst is selected from the group consisting of honeycomb homogeneous microporous thin-walled catalysts.
9. The purification treatment apparatus according to claim 8, wherein the catalyst has the following characteristics: the number of holes is 18-50, the wall thickness is 0.4-1.3 cm, the specific surface area is 400-2/m3The pore volume is more than or equal to 0.25cm3The pore diameter is more than or equal to 35nm, the longitudinal compressive strength is 2000-grade and 2200KPa, and the transverse direction isThe compressive strength is 600 KPa and 700 KPa.
10. The purification treatment device of claim 1, wherein a main fan and a chimney are connected to an outlet pipe of the bag-type dust removal system; and the bottom of the semidry deacidification system, the bottom of the cyclone dust collector and the bottom of the bag type dust removal system are connected with ash bins.
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