CN111495136A - Full-flow low-temperature dry-method deep treatment system for waste heat treatment flue gas - Google Patents

Full-flow low-temperature dry-method deep treatment system for waste heat treatment flue gas Download PDF

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CN111495136A
CN111495136A CN202010326539.1A CN202010326539A CN111495136A CN 111495136 A CN111495136 A CN 111495136A CN 202010326539 A CN202010326539 A CN 202010326539A CN 111495136 A CN111495136 A CN 111495136A
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flue gas
dry
tower
temperature
low
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CN111495136B (en
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陈雄波
刘莹
岑超平
方平
陈定盛
谭玉菲
陆鹏
陈冬瑶
石小霞
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South China Institute of Environmental Science of Ministry of Ecology and Environment
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South China Institute of Environmental Science of Ministry of Ecology and Environment
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Abstract

The invention discloses a full-flow low-temperature dry-method deep treatment system for waste heat treatment flue gas, which is designed according to the characteristics of the waste heat treatment flue gas and is formed by combining an indirect cold and hot circulating system, a dry-method deacidification tower, a dry-method adsorption tower, a bag type dust collector, a low-temperature vulcanization-catalysis tower and other units. In the treatment process, energy is recycled, the treatment of waste by waste is realized among pollutants, the treatment function is circularly buckled, and the particulate matters, NOx, CO and SO in the flue gas are deeply purified at low temperature (250-2VOCs, HCl, heavy metals and dioxins, the purification rate reaches more than 95 percent, and the requirement of ultralow emission standard is met. The system has the advantages of no waste water, low energy consumption, low investment cost, stable and reliable operation, high emission reduction efficiency, simple and easily-controlled process and the like, and is suitable for deep treatment of heat treatment flue gas of waste incineration, pyrolysis, gasification and the like.

Description

Full-flow low-temperature dry-method deep treatment system for waste heat treatment flue gas
Technical Field
The invention belongs to the technical field of air pollution control, and particularly relates to a full-flow low-temperature dry-method deep treatment system for waste heat treatment flue gas.
Background
The garbage heat treatment is to utilize the heat value of the garbage to make the garbage harmless through incineration, pyrolysis, gasification and other modes. Due to the complex composition of the garbage, a great amount of smoke, NOx and SO are generated in the heat treatment process2CO, HCl, VOCs, dioxins and heavy metals. At present, each pollutant in the heat treatment smoke is largeSome have more mature treatment technologies. Treating the particulate matters by using a bag type dust collector according to the regulation (CJJ 90-2009); SO (SO)2The treatment technology of acid gases such as HCl and the like comprises a wet method, a semi-dry method and a dry method, compared with the wet method and the semi-dry method, the removal rate of deacidification by the dry method is lower, but the method has the advantages of low operation cost, low energy consumption, no waste water production, difficult scaling and the like, and is suitable for a low-temperature flue gas treatment process; the NOx treatment technology is divided into a dry method and a wet method, the Selective Catalytic Reduction (SCR) technology in the dry method treatment has the highest NOx removal rate, and the SCR can be divided into NH according to different reducing gases3-SCR、CO-SCR、H2-SCR, etc. In the face of increasingly stringent NOx emission standards, NH is added to a portion of the heat treatment flue gas treatment process3-SCR technology units, such as: the processes of semi-dry deacidification, activated carbon powder injection adsorption of dioxin and heavy metals, cloth bag dedusting, wet deacidification and SCR denitration, the processes of semi-dry deacidification, activated carbon powder injection adsorption of dioxin and heavy metals, cloth bag dedusting, wet deacidification and SCR denitration and the like are adopted, but NH is added3SCR in the Presence of a reducing agent NH in practical applications3Large consumption, high operation and maintenance cost, easy corrosion equipment and the like. CO is one of main pollutants in the flue gas of the garbage heat treatment, and no mature treatment technology can effectively remove CO, so that the technical feasibility and the economic efficiency of CO-SCR using CO as a reducing agent are the most excellent. CO-SCR is widely applied in the field of automobile exhaust gas treatment, and is different from garbage heat treatment flue gas in that main pollutants in automobile exhaust gas comprise CO, NOx and HC, and SO in the automobile exhaust gas2The content is less, and the temperature of the exhaust gas under the common working conditions (low speed and medium speed) is between 400-600 ℃, so the treatment process applied to the automobile exhaust gas and the three-way catalyst are designed according to the characteristics of the exhaust gas, and NOx, HC and CO in the high-temperature exhaust gas are oxidized and reduced into CO under the action of the three-way catalyst2、H2O、N2And the synergistic removal efficiency is higher, but the flue gas temperature and pollutant characteristics of the garbage heat treatment are greatly different from those of the automobile exhaust, so that the existing automobile exhaust treatment technology is not suitable for treating the garbage heat treatment flue gas.
In recent years, the dry treatment technology has low investment and operation cost, and is gradually applied to flue gas treatment of garbage heat treatmentIn the processing technology. Patent CN201710266670.1 discloses a domestic waste pyrolysis burns device gas cleaning system, its system mainly comprises quench tower + electromagnetic pulse dust remover + waste heat utilization and cooling device + carbon fiber filter equipment + dioxin chemical catalysis device, can get rid of CO, SO in the burning gas fume2Pollutants such as NOx, dioxin and the like, and the emission concentration of the dioxin meets the national standard. Patent CN201710494988.5 discloses a novel msw incineration flue gas processing system, this system adopt flue gas recirculation + SNCR + full dry process deacidification + activated carbon absorption + high-efficient sack cleaner, have that the treatment cost is low, occupation space is little, high standard discharge to reach standard of flue gas etc. advantage. However, the existing dry treatment process has the following defects: in the aspect of process design, each technical unit is simply connected in series, and the unit combination is too complex; in terms of treatment efficiency, low-temperature treatment efficiency of pollutants is low, and CO is not effectively treated. Therefore, the development of a dry method synergistic treatment process for deeply treating various pollutants at low temperature has great significance for realizing ultralow emission of flue gas in garbage heat treatment.
Disclosure of Invention
In order to solve the defects and shortcomings of the prior art, the invention provides a full-flow low-temperature dry-method deep treatment system for waste heat treatment flue gas. The system is designed according to the characteristics of the temperature and the components of the pollutants, the whole process adopts a dry treatment technology, and the interaction between the pollutants and the treatment link is utilized to deeply purify the particulate matters, NOx, CO and SO in the flue gas2VOCs, HCl, heavy metals and dioxins, so as to achieve the purposes of recycling energy and treating wastes with wastes. The method has the advantages of low investment cost, stable and reliable operation, high emission reduction efficiency, simple and easily-controlled process and the like, and is suitable for deep treatment of heat treatment flue gas of waste incineration, pyrolysis, gasification and the like.
The purpose of the invention is realized by the following technical scheme:
a full-flow low-temperature dry-method deep treatment system for waste heat treatment flue gas is formed by combining an indirect cold and hot circulating system, a dry-method deacidification tower, a dry-method adsorption tower, a bag type dust collector, a low-temperature vulcanization-catalysis tower and other units, and comprises the following treatment steps:
(1) sending the flue gas into an indirect cooling and heating circulation system for cooling, and supplying the heat after cooling and heat exchange to a low-temperature vulcanization-catalysis tower;
(2) sending the cooled flue gas into a dry-method deacidification tower, and purifying acid gas in the flue gas by using a deacidification agent;
(3) feeding the flue gas purified by the dry deacidification tower into a dry adsorption tower, and removing heavy metals and dioxins in the flue gas through an adsorption bed layer;
(4) feeding the flue gas purified by the dry adsorption tower into a bag type dust collector, and trapping particulate matters, deacidifying agents and adsorbents in the flue gas;
(5) the flue gas purified by the bag type dust collector is sent into a low-temperature vulcanization-catalysis tower, and after the catalyst in the low-temperature vulcanization-catalysis tower is vulcanized by the residual acid gas in the flue gas, NOx is reduced and purified by CO and VOCs in the flue gas under the action of the vulcanization catalyst, so that the deep treatment of the flue gas is realized.
And (1) the indirect cooling and heating circulating system consists of a water return pump, a water return pipe, an upper water pool, a condensation pipe, a lower water pool, a heat supply pipe and a water supply pump. Condensed water is injected into the condensing pipe from the upper water tank, the temperature of the flue gas is rapidly reduced to 170-200 ℃ through the condensing pipe, and secondary synthesis of dioxins is inhibited; the condensed water after heat exchange enters a heat supply pipe through a lower water tank and a water supply pump, enters the heat supply pipe (heat supply pipe in the tower) of the low-temperature vulcanization-catalysis tower through the water supply pump, raises the temperature of the flue gas in the tower to 250-280 ℃, and after heat is released, the condensed water enters an upper water tank through a water return pump and a water return pipe so as to circulate.
The dry deacidification tower in the step (2) comprises a storage bin and an injection pipe; for storage and spraying of deacidification agents;
the deacidification agent in the step (2) is Ca (OH)2One or more of CaO and MgO; the acid gas is SO2And HCl.
The adsorbent in the adsorption bed layer in the dry adsorption tower in the step (3) is one or more of activated carbon, molecular sieve and titanium-based adsorbent of patent publication CN 106824044A.
And (4) arranging a filter bag and a corresponding continuous pulse ash removal system in the bag type dust collector.
And (5) the low-temperature vulcanization-catalysis tower comprises a heat supply pipe in the tower.
Preferably, the preparation method of the catalyst in the step (5) is one of an impregnation method, a coprecipitation method and a citric acid method; more preferably, the active component composed of one or more metal oxides of Ce, Mn, Fe and Cu is loaded on TiO2、ZrO2、Al2O3On a carrier of (a); after the preparation, the catalyst is molded into one of an integral honeycomb catalyst, a strip catalyst and a plate catalyst.
Preferably, the sulfidation in step (5) is carried out by SO in flue gas at a temperature of 250 ℃ and 280 DEG C2Sulfiding, thereby forming a sulfided catalyst.
The purpose of the dry deacidification tower is to remove HCl and reduce SO2To SO in flue gas2The HCl removal efficiency is respectively between 35 and 50 percent and 85 to 95 percent, and the removal efficiency to SO is between2High purification is not required as in wet and semi-dry deacidification.
In the low-temperature sulfurizing-catalyzing tower, the unpurified SO in the dry deacidifying tower2Plays a key role in reducing NOx at low temperature by CO. At low temperature (250-280 ℃), unpurified SO in the flue gas2Part of the metal sulfate is preferentially adsorbed on the surface of the catalyst and generates metal sulfate with the metal oxide on the surface of the catalyst; part of SO2Reducing the S into simple substance, generating metal sulfide with metal oxide on the surface of the catalyst or in crystal lattice on one hand, and generating COS gas with stronger reducibility by reacting with CO on the other hand. As the reaction proceeds, the catalyst becomes gradually sulfided. The NO is adsorbed on the surface of the sulfurized catalyst, and is reacted with CO and O2Reduction to N by reaction2Or N2And O. The metal sulfate and the metal sulfide enhance the acidity of the catalyst, so that NO is more easily decomposed on the vulcanized catalyst; COS produced in the reaction is more susceptible to reduction of NO and SO than CO2. Unpurified SO in flue gas2Ensures the sulfur circulation in the whole reaction process, maintains the continuous regeneration of the metal sulfate, the metal sulfide and the COS gas in the catalyst, and ensures that the catalyst is kept vulcanized. The sulfuration catalyst provides for CO-SCR reactionRich oxygen vacancy and surface acid site, CO and NO are easier to be adsorbed on the surface of the catalyst for oxidation reduction reaction, and the purification efficiency of NOx is greatly improved. Therefore, the SO in the flue gas is not removed2Is necessary to maintain the cycle and catalyst life of the low temperature CO-SCR reaction. In addition, VOCs and O2Oxidation reaction is carried out under the action of an acidification catalyst to generate CO2And H2And benzene and alkane in O and VOCs also have a function of purifying NOx.
The dry deacidification tower, the dry adsorption tower and the low-temperature vulcanization-catalysis tower complement each other. The arrangement of the dry method deacidification tower avoids the over-high concentration of SO2The adsorbent is deactivated after entering a dry adsorption tower; the defect of low deacidification efficiency of the dry deacidification tower is converted into advantages in the low-temperature vulcanization-catalysis tower, and the advantages promote CO, NOx and SO2And pollutants such as VOCs are synergistically and deeply purified.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention designs a treatment process according to the characteristics of the temperature of the flue gas and the components of pollutants, the energy is recycled in the treatment process, the treatment of wastes by wastes is realized among the pollutants, the treatment functions are linked, and the particle matters, NOx, CO and SO in the flue gas are deeply purified at low temperature (250 ℃ C.) and 280 ℃ C2VOCs, HCl, heavy metals and dioxins, the purification rate reaches more than 95 percent, and the requirement of ultralow emission standard is met.
2. The whole process of the invention adopts a dry treatment technology, and has the advantages of no waste water, low energy consumption, low investment cost, stable and reliable operation, high emission reduction efficiency, simple and easily controlled process and the like.
Drawings
FIG. 1 is a full-flow low-temperature dry-process deep treatment system for flue gas generated by heat treatment of garbage, wherein 1 is an indirect cooling and heating circulation system, 1-1 is an upper water tank, 1-2 is a lower water tank, 1-3 is a condensation pipe, 1-4 is a water return pipe, 1-5 is a heat supply pipe, 1-6 is a water supply pump, 1-7 is a water return pump, 2 is a dry-process deacidification tower, 2-1 is a storage bin, 2-2 is an injection pipe, 3 is a dry-process adsorption tower, 3-1 is an adsorption bed layer, 4 is a bag type dust collector, 4-1 is a filter bag, 4-2 is a continuous pulse ash removal system, 5 is a low-temperature vulcanization-catalysis tower, 5-1 is a vulcanization catalyst, 5-2 is a heat supply pipe in the tower, 6 is a discharge pipe, and 6-1 is an exhaust fan.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
The working steps of the full-flow low-temperature dry-method deep treatment system for the waste heat treatment flue gas are as follows: high-temperature (more than 500 ℃) flue gas discharged by the garbage heat treatment enters an indirect cold and hot circulating system 1; condensed water is injected into the condensing pipe 1-3 from the upper water pool 1-1, the temperature of the flue gas is rapidly reduced to 170-200 ℃ through the condensing pipe 1-3, and secondary synthesis of dioxins is inhibited; the condensed water after heat exchange enters a heat supply pipe 1-5 through a lower water pool 1-2, enters a heat supply pipe 5-2 in the tower through a water supply pump 1-6, raises the temperature of the flue gas in the tower to 250 plus 280 ℃, and enters an upper water pool 1-1 through a return water pump 1-7 and a return water pipe 1-4 after heat release so as to circulate; introducing the flue gas subjected to temperature reduction and heat exchange by the indirect cold and hot circulating system 1 into a dry deacidification tower 2, wherein the dry deacidification tower 2 comprises a storage bin 2-1 and an injection pipe 2-2; the flue gas reacts with a deacidification agent in a dry deacidification tower 2 to reduce the concentration of acid gas in the flue gas, then enters a dry adsorption tower 3, the flue gas passes through an adsorption bed layer 3-1 in the tower from top to bottom, heavy metals and dioxins are adsorbed and fixed in the adsorption bed layer 3-1 by an adsorbent, the flue gas after adsorption and purification enters a bag type dust collector 4, a filter bag 4-1 collects particulate matters and fly ash in the flue gas and deacidification agent, adsorbent and the like which are reacted and remained in a front end treatment link, a continuous pulse ash removal system 4-2 works together during collection, the flue gas after dust collection enters a low-temperature vulcanization-catalysis tower 5, the reaction temperature in the tower is supplied by an indirect cold and heat circulation system, and the temperature of CO, NOx, VOCs and SO are stably maintained at 280 ℃ in an2And (3) reacting and purifying the pollutants under the action of a vulcanization catalyst 5-1 in the tower, and discharging the purified flue gas from a discharge pipe 6 through an exhaust fan 6-1.
Example 1
The temperature of introduced flue gas is 600 ℃, and the initial concentration of pollutants is CO 3000mg/m3、NOx 300mg/m3、SO2600mg/m3、HCl 50mg/m30.2ng TEQ of dioxinsm3、VOCs 50mg/m3150mg/m of particulate matter3Heavy metal 20mg/m3The waste incinerator flue gas passes through an indirect cold and hot circulating system, a dry deacidification tower, a dry adsorption tower, a bag type dust collector and a low-temperature vulcanization-catalysis tower in sequence. The temperature of the flue gas is reduced to 200 ℃ after the flue gas passes through an indirect cold and hot circulating system, and the flue gas is Ca (OH) in a dry deacidification tower after the temperature is reduced2After reaction, the flue gas enters a dry adsorption tower, the flue gas which is adsorbed and purified by a titanium-based adsorbent enters a low-temperature vulcanization-catalysis tower, and pollutants and Mn-Ce/TiO at the temperature of 270 ℃ in the tower2The discharge concentration of the purified flue gas is CO 60mg/m3、NOx 20mg/m3、SO210mg/m3、HCl 0mg/m3Dioxins 0.01ng TEQ/m3、VOCs 5mg/m310mg/m of particulate matter30mg/m of heavy metal3。
Example 2
The temperature of the introduced flue gas is 500 ℃, and the initial concentration of pollutants is CO 1000mg/m3、NOx 250mg/m3、SO2400mg/m3、HCl 50mg/m3Dioxins 0.1ng TEQ/m3、VOCs 60mg/m3200mg/m of particulate matter3Heavy metal 25mg/m3The waste pyrolysis furnace flue gas sequentially passes through an indirect cooling and heating circulating system, a dry deacidification tower, a dry adsorption tower, a bag type dust collector and a low-temperature vulcanization-catalysis tower. Cooling the flue gas to 170 ℃ after the flue gas passes through an indirect cooling and heating circulation system, allowing the cooled flue gas to react with CaO in a dry-method deacidification tower, allowing the cooled flue gas to enter a dry-method adsorption tower, allowing the flue gas purified by activated carbon adsorption to enter a low-temperature vulcanization-catalysis tower, and allowing pollutants and Fe-Ce/ZrO in the tower to react at 260 DEG C2The reaction of the acidification bar-shaped catalyst, the emission concentration of the purified flue gas is CO 30mg/m3、NOx 10mg/m3、SO25mg/m3、HCl 0mg/m3Dioxins 0.01ng TEQ/m3、VOCs10mg/m315mg/m of particulate matter30mg/m of heavy metal3。
Example 3
The temperature of the introduced flue gas is 550 ℃, and the pollution is causedThe initial concentration of the substance is CO 5000mg/m3、NOx 350mg/m3、SO2570mg/m3、HCl 40mg/m3Dioxins 0.17ng TEQ/m3、VOCs 35mg/m3250mg/m of particulate matter3Heavy metal 15mg/m3The waste gasification furnace flue gas passes through an indirect cold-hot circulating system, a dry deacidification tower, a dry adsorption tower, a bag type dust collector and a low-temperature vulcanization-catalysis tower in sequence. Cooling the flue gas to 190 ℃ after the flue gas passes through an indirect cooling and heating circulation system, allowing the cooled flue gas to enter a dry adsorption tower after MgO reaction in a dry deacidification tower, allowing the flue gas purified by molecular sieve adsorption to enter a low-temperature vulcanization-catalysis tower, and allowing pollutants and Cu/Al in the tower to react at the temperature of 280 DEG C2O3The reaction of acidification plate type catalyst, the emission concentration of the purified flue gas is 100mg/m of CO3、NOx 25mg/m3、SO210mg/m3、HCl 0mg/m3Dioxins 0.01ng TEQ/m3、VOCs0mg/m315mg/m of particulate matter30mg/m of heavy metal3。
Example 4
The temperature of the introduced flue gas is 700 ℃, and the initial concentration of the pollutants is 3500mg/m of CO3、NOx 450mg/m3、SO2520mg/m3、HCl 40mg/m3Dioxins 0.12ng TEQ/m3、VOCs 25mg/m3250mg/m of particulate matter3Heavy metal 5mg/m3The waste incinerator flue gas passes through an indirect cold and hot circulating system, a dry deacidification tower, a dry adsorption tower, a bag type dust collector and a low-temperature vulcanization-catalysis tower in sequence. Cooling the flue gas to 180 ℃ after the flue gas passes through an indirect cooling and heating circulation system, allowing the cooled flue gas to react with CaO in a dry-method deacidification tower, allowing the cooled flue gas to enter a dry-method adsorption tower, allowing the flue gas purified by activated carbon adsorption to enter a low-temperature vulcanization-catalysis tower, and allowing pollutants and Ce/TiO to react at the temperature of 250 ℃ in the tower2The discharge concentration of the purified flue gas is CO 50mg/m3、NOx 10mg/m3、SO210mg/m3、HCl 5mg/m3Dioxins 0.01ng TEQ/m3、VOCs 0mg/m310mg/m of particulate matter30mg/m of heavy metal3。
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (10)

1. A full-flow low-temperature dry-method deep treatment system for waste heat treatment flue gas is characterized by being formed by combining an indirect cold and hot circulating system, a dry-method deacidification tower, a dry-method adsorption tower, a bag type dust collector and a low-temperature vulcanization-catalysis tower, and comprising the following treatment steps of:
(1) sending the flue gas into an indirect cooling and heating circulation system for cooling, and supplying the heat after cooling and heat exchange to a low-temperature vulcanization-catalysis tower;
(2) sending the cooled flue gas into a dry-method deacidification tower, and purifying acid gas in the flue gas by using a deacidification agent;
(3) feeding the flue gas purified by the dry deacidification tower into a dry adsorption tower, and removing heavy metals and dioxins in the flue gas through an adsorption bed layer;
(4) feeding the flue gas purified by the dry adsorption tower into a bag type dust collector, and trapping particulate matters, deacidifying agents and adsorbents in the flue gas;
(5) the flue gas purified by the bag type dust collector is sent into a low-temperature vulcanization-catalysis tower, and after the catalyst in the low-temperature vulcanization-catalysis tower is vulcanized by the residual acid gas in the flue gas, NOx is reduced and purified by CO and VOCs in the flue gas under the action of the vulcanization catalyst, so that the deep treatment of the flue gas is realized.
2. The full-flow low-temperature dry-process deep treatment system for flue gas generated in heat treatment of garbage according to claim 1, which is characterized in that:
and (1) the indirect cooling and heating circulating system consists of a water return pump, a water return pipe, an upper water pool, a condensation pipe, a lower water pool, a heat supply pipe and a water supply pump.
3. The full-flow low-temperature dry-process deep treatment system for flue gas generated in heat treatment of garbage according to claim 2, characterized in that:
condensed water is injected into the condensing pipe from the upper water tank, the temperature of the flue gas is rapidly reduced to 170-200 ℃ through the condensing pipe, and secondary synthesis of dioxins is inhibited; the condensed water after heat exchange enters a heat supply pipe through a lower water tank and a water supply pump, enters the heat supply pipe of the low-temperature vulcanization-catalysis tower through the water supply pump, raises the temperature of the flue gas in the tower to 250-280 ℃, and after heat is released, the condensed water enters an upper water tank through a water return pump and a water return pipe so as to circulate.
4. The full-flow low-temperature dry-process deep treatment system for flue gas generated in heat treatment of garbage according to claim 1, 2 or 3, characterized in that:
the dry deacidification tower in the step (2) comprises a storage bin and an injection pipe; for storage and spraying of deacidification agents;
the deacidification agent in the step (2) is Ca (OH)2One or more of CaO and MgO.
5. The full-flow low-temperature dry-process deep treatment system for flue gas generated in heat treatment of garbage according to claim 1, which is characterized in that:
the adsorbent in the adsorption bed layer in the dry adsorption tower in the step (3) is one or more of activated carbon, molecular sieve and titanium-based adsorbent of patent publication CN 106824044A.
6. The full-flow low-temperature dry-process deep treatment system for flue gas generated in heat treatment of garbage according to claim 1, which is characterized in that: and (4) arranging a filter bag and a corresponding continuous pulse ash removal system in the bag type dust collector.
7. The full-flow low-temperature dry-process deep treatment system for flue gas generated in heat treatment of garbage according to claim 1, which is characterized in that:
and (5) the low-temperature vulcanization-catalysis tower comprises a heat supply pipe in the tower.
8. The full-flow low-temperature dry-process deep treatment system for flue gas generated in heat treatment of garbage according to claim 1, which is characterized in that:
the preparation method of the catalyst in the step (5) is one of an impregnation method, a coprecipitation method and a citric acid method.
9. The full-flow low-temperature dry-process deep treatment system for flue gas generated in heat treatment of garbage according to claim 8, characterized in that:
the catalyst is an active component composed of one or more metal oxides of Ce, Mn, Fe and Cu and loaded on TiO2、ZrO2、Al2O3On a carrier of (a); after the preparation, the catalyst is molded into one of an integral honeycomb catalyst, a strip catalyst and a plate catalyst.
10. The full-flow low-temperature dry-process deep treatment system for flue gas generated in heat treatment of garbage according to claim 1, which is characterized in that: the step (5) of sulfurizing is to ensure that the catalyst is subjected to SO in the flue gas at the temperature of 250 ℃ and 280 DEG C2Sulfiding, thereby forming a sulfided catalyst.
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