CN212575981U

CN212575981U - Desulfurization and denitrification device based on flue gas semidry method

Info

Publication number: CN212575981U
Application number: CN202020664137.8U
Authority: CN
Inventors: 张程帅; 张元仁
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-27
Filing date: 2020-04-27
Publication date: 2021-02-23
Anticipated expiration: 2030-04-27

Abstract

The utility model relates to an environmental protection technical field, concretely relates to SOx/NOx control device based on flue gas semidry process, including desulfurizer supply unit, desulfurizer reaction absorption unit, ozone mixed reaction unit. The utility model has the advantages that: by adopting a set of devicesSimultaneously complete SO of flue gas₂、NO_XThe flue gas is purified with multi-component pollutants such as dust, and the integrated treatment of desulfurization, denitrification and dust removal of the flue gas is realized; ozone is easily decomposed into oxygen, and compared with SCR and SNCR denitration processes, the denitration process has no NH₃Escape phenomena; the desulfurization and denitrification efficiency is high, and the environmental protection requirement can be completely met; the desulfurization and denitrification adopt different configurations according to different working conditions, the application range is wide, and the flue gas quantity fluctuation and SO can be well adapted₂、NO_XFluctuation of harmful components.

Description

Desulfurization and denitrification device based on flue gas semidry method

Technical Field

The utility model relates to an environmental protection technical field, concretely relates to SOx/NOx control device based on flue gas semidry process.

Background

SO is the main component of pollutants in coal-fired boilers or smelting industries₂(including SO)₃) NOx and dust. The pollutants discharged into the atmosphere along with the flue gas can seriously affect the air quality, corrode the device and influence the normal operation of the device, so that the flue gas purification in the coal-fired boiler or the smelting industry is important in environmental protection and treatment.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the problem that exists among the prior art, provide a SOx/NOx control device based on flue gas semidry method, it can realize solving prior art's problem to a certain extent at least.

In order to realize the technical purpose, the technical effect is achieved, the utility model discloses a realize through following technical scheme:

a desulfurization and denitrification device based on a flue gas semi-dry method comprises:

the desulfurizer supply unit comprises a desulfurizer bin, a spiral metering scale, an air feeding chute, a high-pressure centrifugal blower, a star discharger, an air lifting pump, a feeder and a Roots blower, wherein the desulfurizer bin is used for storing desulfurizer, the spiral metering scale is used for weighing the desulfurizer sent out from the desulfurizer bin, conveying the desulfurizer to the upper end of the air feeding chute and then feeding the desulfurizer into a material chamber of the air feeding chute, the high-pressure centrifugal blower is used for blowing air to an air chamber positioned at the lower layer in the air feeding chute to enable powder to be in a suspended state, the air feeding chute is provided with an inclination angle, so that the desulfurizer automatically flows to the star discharger on the air feeding chute and enters the air lifting pump, the upper part of the air lifting pump is a pump body, and the lower part of the air lifting pump is a gasification chamber supplied with air by the Roots blower, the porous air-permeable plate is arranged between the upper part and the lower part, the powder in the star-shaped discharger enters an upper pump body of the air-lift pump, the gasification chamber at the lower part of the air-lift pump conveys the airflow of the Roots blower into the upper pump body through the porous air-permeable plate to fluidize the powder, and conveys the material into the feeder through the high-pressure airflow of the Roots blower through the conveying pipe, and the material is sprayed out by a nozzle in the feeder to be mixed with the flue gas;

desulfurizer reaction absorption unit, desulfurizer reaction absorption unit includes V type blender, reaction absorber, water tank, high pressure water pump, atomizing spray gun, row's sediment ware, V type blender and charging means intercommunication, the nozzle spun flue gas of charging means gets into and atomizes in the V type blender and mixes, and gets into in the reaction absorber, high pressure water pump pressurizes the running water in the water tank to spray via the atomizing spray gun who locates in the reaction absorber, make SO in the flue gas₂The slag extractor is used for collecting and removing scabs falling off from the reaction absorber;

the ozone mixing reaction unit comprises an ozone generator and an ozone mixer, wherein the ozone generator is used for generating ozone and conveying the ozone to the ozone mixer, and the ozone mixer is communicated with a feeder.

As a further optimization of the technical scheme, a bag-type dust remover at the top of the desulfurizer bin is arranged.

As a further optimization of the technical scheme, the inner wall of the reaction absorber is pasted with wear-resistant ceramics.

As a further optimization of the technical scheme, the atomizing spray gun adopts a single-fluid backflow structure.

As a further optimization of the technical scheme, the water tank is communicated with the reaction absorber through a water pipe, and a water return regulating valve is arranged on the water pipe and used for regulating the water supply pressure in the water pipe.

The utility model has the advantages that: SO of flue gas can be simultaneously finished by adopting one set of device₂、NO_XThe flue gas is purified with multi-component pollutants such as dust, and the integrated treatment of desulfurization, denitrification and dust removal of the flue gas is realized; all overThe process is dry, no waste water is discharged, and the SO in the flue gas can be removed₂、NO_XAnd dust, harmful substances such as HCl, HF, heavy metals and the like can be effectively removed, and the whole desulfurization system and the chimney do not need to be anticorrosive; ozone is easily decomposed into oxygen, and compared with SCR and SNCR denitration processes, the denitration process has no NH₃Escape phenomena; the desulfurization and denitrification efficiency is high, and the environmental protection requirement can be completely met; the desulfurization and denitrification adopt different configurations according to different working conditions, the application range is wide, and the flue gas quantity fluctuation and SO can be well adapted₂、NO_XFluctuation of harmful components.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic diagram of the ozone generation principle of the ozone generator in the embodiment of the present invention.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-2, fig. 1-2 show a desulfurization and denitrification apparatus based on a flue gas semi-dry method, comprising:

one, semidry method lime hydrate desulfurization system

1. Desulfurizing agent supply unit

Will meet the quality (Ca (OH)₂The slaked lime or carbide slag with the content more than or equal to 80 percent, the fineness of 200 meshes and the water content less than or equal to 1 percent is used as a desulfurization absorbent and is transported to the site by a tank truck 42 to be pumped into a desulfurizer bin 16, and an anti-blocking device is arranged on a cone at the bottom of the desulfurizer bin 16. The top of the desulfurizer bin 16 is provided with a bin top bag-type dust remover 36, so that the discharged gas meets the requirements of pollutant discharge standards.

After the desulfurizer in the desulfurizer bin 16 is weighed and metered to a design value by a spiral metering scale 18 at the bin bottom, the desulfurizer is put at the high end of an air conveying chute 19 and fed into a material chamber of an upper shell, the air conveying chute 19 blows air to an air chamber at the lower layer of the air conveying chute 19 by a high-pressure centrifugal blower 20, the gas with pressure passes through micropores of a ventilation layer (fluidized bed) between the upper layer and the lower layer, the fluidized desulfurizer changes the repose angle, and powder is in a suspended state. The air-supply chute 19 has a certain inclination, the desulfurizing agent flows forwards under the action of self gravity and component force, and enters the air-lift pump 21 after being conveyed to the star discharger 17, the upper part of the air-lift pump 21 is a pump body, the lower part of the air-lift pump is a gasification chamber (the air source of the gasification chamber is supplied by the Roots blower 22), and the middle part of the air-lift pump is provided with a porous air-permeable plate. The primary air outlet is equipped with a nozzle, and is aligned with the material-conveying pipe, the lower outlet of the material-conveying pipe is equipped with an expansion cabin, the secondary air outlet is connected with gasification chamber, and can be used for blowing ash to form fluidized state by means of air-permeable layer, and the conveyed material can be upwards conveyed into material-feeding device 23 by means of lifting pipe along with the compressed air flow from nozzle, and can be sprayed from nozzle 24 in material-feeding device 23 and mixed with flue gas.

2. Desulfurizing agent reaction absorption unit

The desulfurizing agent is sprayed out from the nozzle 24 and then is sufficiently and rapidly atomized and mixed with the flue gas in the V-shaped mixer 25, and then enters the reaction absorber 27, and the reaction absorber 27 is provided with a flow guide device so that the gas flow can uniformly pass through and the inner surface is adhered with wear-resistant ceramic.

Tap water enters the water tank 28 for standby, is pressurized through the high-pressure water pump 29 and is sprayed out through the atomizing spray gun 31 in the reaction absorber 27, the atomizing spray gun 31 adopts a single-fluid backflow type, the reaction absorber 27 automatically adjusts the water spraying amount of the reaction absorber 27 through the outlet flue gas temperature, the water supply loop is provided with the water return adjusting valve 30, the water supply pressure of the water channel is automatically adjusted through DCS, and the water spraying amount is reasonably adjusted to achieve total evaporation. In the reaction absorber 27, SO2 in the flue gas is dissolved in the atomized water to form sulfurous acid, and the sulfurous acid reacts with the calcium hydroxide to generate a calcium sulfite solid precipitate, thereby achieving the purpose of desulfurization.

The scabs generated in the reaction absorber 27 fall off, and then slide down into the V-shaped mixer 25, and are automatically discharged out of the system through the slag extractor 26.

The flue gas carries the reacted desulfurizing agent into a bag-type dust collector (cyclone bag-type dust collector) 32.

The bag-type dust collector (cyclone bag-type dust collector) 32 (if the air flow is small, the cyclone bag-type dust collector can be adopted) mainly comprises an ash bucket, a filter chamber, an air purifying chamber, an inlet smoke box, an outlet smoke box, a low-pressure pulse ash cleaning device, an electric control device, a valve and other parts. An upper air inlet mode is adopted, so that pre-collecting dust is performed by using the action of gravity, and the filtering load of the cloth bag is reduced.

The filter bag adopts the surface treatment of imported PPS filter material and PTFE, the continuous operation temperature is less than 150 ℃, the instant 160 ℃ resistance is realized, and the unit weight is not less than 580g/m²。

The cloth bag cage frame is made of low-carbon steel, the cage frame production line is used for one-step forming, the straightness and the torsion resistance of the cage frame are guaranteed, the electrophoresis and organic silicon spraying baking process is adopted for surface corrosion prevention, and the surface is smooth and free of burrs.

The longitudinal ribs and the back-up rings of the bag cage are uniformly distributed, so that the phenomena of desoldering, insufficient soldering and missing soldering are avoided, the strength and the rigidity are sufficient, and the damage and the deformation are prevented.

The dust remover pattern plate is processed by laser without using a punch. The filter bag and the card are matched reasonably, so that the filter bag is ensured to be installed tightly, firmly without dropping and convenient to assemble and disassemble.

The ash cleaning mode, the interval and the intensity can be adjusted by a logic control program.

The inclined wall of the ash bucket has an included angle not less than 65 with the horizontal plane, the ash bucket has good heating and heat preservation measures, the bottom of the ash bucket adopts a full-fluidized fluidization groove and is provided with a group of material level measuring devices, and an ash level signal provided by a material level meter meets the control requirements of a bag-type dust collector control system, material circulation, desulfurization ash discharge and the like.

3. Material circulation and discharge unit

The design of the ash bucket and ash discharging port of the bag-type dust remover (cyclone bag-type dust remover) 32 ensures that ash can be discharged from the ash bucket in a free flowing manner, and the elevation of the ash bucket meets the requirement of material circulation, a distributor 33 is further arranged at the lower part of a fluidization groove of the ash bucket, one path of air inlet conveying chute 34 circulates an air inlet lifting pump 21, the air inlet lifting pump enters a reaction absorber 27 through a desulfurizer supply system for recycling, the other path of air inlet lifting pump is connected with an external ash discharging interface, a bin pump 37 is connected below the interface, an external ash discharging air conveying system is matched, the air conveying system adopts a positive pressure dense phase bin pump conveying mode, the desulfurization ash is conveyed into a desulfurization ash bin 35, and a bin top bag-type dust remover 36 is arranged at the bin top of the desulfurization ash bin 35 so that discharged.

The bottom cone of the desulfurization ash bin 35 is provided with a fluidization plate anti-blocking and dry ash bulk machine 38 on the inner surface, and the desulfurization ash enters a tank truck 42 through the dry ash bulk machine 38 for outward transportation.

4. Compressed air unit

The compressed air system mainly supplies compressed air to a bin top bag-type dust collector 36, a bag-type dust collector (cyclone bag-type dust collector) 32 and a bin pump 37.

Second, VPSA air separation oxygen generation ozone denitration system

The VPSA air separation oxygen production ozone denitration system comprises the following parts: a VPSA air separation oxygen generation unit,

Ozone unit, water cooling unit, ozone mix reaction unit, electric control unit and gas unit constitute.

The principle of ozone denitration is that ozone can oxidize NO which is difficult to dissolve in water into NO which is easy to dissolve in water₂、N₂O₃、N₂O₅The high-valence nitrogen oxides are easy to dissolve in water to form nitric acid, and the nitric acid reacts with calcium hydroxide in a desulfurization system and then is discharged together with desulfurization ash.

Compared with SCR or SNCR denitration, the VPSA air separation oxygen generation ozone denitration unit has several obvious advantages:

1) strong adaptability denitration efficiency is high:the adaptability of low-temperature oxidation denitration is strong, the method can well adapt to the fluctuation of the flue gas volume and the fluctuation of the flue gas temperature in a large range of 90-200 ℃, and the denitration method is suitable for the conditions of O₃When the molar ratio of NO to eta is 0.9, eta is not less than 84 percent;

2) the equipment investment is low, the occupied area is small, the system is simple, and no wastewater is discharged;

3) the desulfurization and denitrification process has no secondary pollution: ozone is used as an oxidant to perform absorption reaction with calcium hydroxide, so that desulfurization and denitrification are performed simultaneously.

4) No NH3 escape phenomenon: ozone is easily decomposed into oxygen, and compared with SCR and SNCR denitration processes, the SCR and SNCR denitration process has no NH3 escape phenomenon.

VPSA air separation oxygen generation unit

The system removes impurities and moisture in air through an air preprocessor 1, a Roots blower in a Roots blower-vacuum pump integrated machine 2 is compressed, then the compressed Roots blower passes through a heat exchanger 3 and enters 2 adsorption tanks 5, and H of the air₂O、N₂、CO₂The components are sequentially adsorbed by a plurality of adsorbents to obtain the O-rich product with the purity of 90 percent (the purity can be arbitrarily set between 60 percent and 93 percent by a computer)₂Is output from the tower top and enters an oxygen buffer tank 6. When the front edge of the mass transfer zone (called as adsorption front edge) of the adsorbed impurities reaches a certain position of the reserved section of the bed layer outlet, the PLC program automatically switches on and off the program control pneumatic valve 4, and the raw material gas feed valve and the product gas outlet valve of the adsorption tower are closed to stop adsorption. The adsorption bed begins to shift to the regeneration process, one of the adsorption tanks 5 is pumped by a vacuum pump in the Roots blower-vacuum pump integrated machine 2 to generate negative pressure during regeneration, and N adsorbed by the molecular sieve in the adsorption tank 5₂、CO₂And the air is sucked into the vacuum pump and is discharged to the atmosphere after passing through the steam-water separator 10. The two adsorption tanks work alternately, and the adsorption tank 5 finishes a complete adsorption-regeneration cycle and prepares for the next adsorption through the processes of pressurization adsorption, pressure equalizing and reducing, negative pressure regeneration, pressure equalizing and increasing, oxygen pressurization and the like.

The two adsorption tanks 5 work alternately according to a program, so that air can be continuously separated to obtain oxygen, the oxygen is sent to an oxygen compressor 7 through a pipeline to be pressurized to a design pressure and then enters a low-pressure oxygen buffer tank 8, and the oxygen is conveyed to an ozone working section through a pipeline after being regulated by pressure stabilization according to the oxygen consumption in production.

2. Ozone preparation unit

The ozone preparation system adopts a corona discharge method in an ozone generator 9 to prepare ozone. The principle is as follows: the core of the ozone generator adopts an advanced dielectric barrier double-gap discharge technology, raw material oxygen flows through narrow gaps between an insulating medium and a high-voltage electrode and between an insulating medium layer and a tank grounding electrode of the ozone generator 9, and a high-voltage electric field between two annular gaps discharges on two sides to convert the passing oxygen into ozone.

When oxygen passes through a discharge electric field between the high-voltage alternating current electrodes, oxygen molecules are dissociated into oxygen atoms under the bombardment of high-speed electron current, and the oxygen atoms rapidly react with the oxygen molecules to generate ozone molecules. As shown in the following figures:

partial oxygen in the ozone generating chamber is changed into ozone through medium-frequency high-voltage discharge, and product gas is output from an ozone gas outlet after temperature, pressure and flow monitoring and regulation. The ozone generator 9 is provided with an ozone gas inlet, and the ozone outlet concentration of the ozone generator 9 is monitored on line through an ozone concentration detector equipped on the ozone generator 9.

3. Water cooling unit

The cooling water of the ozone generator 9 is designed into a closed-loop circulating cooling water system, the two networks provide the cooling water for the ozone generator 9 through a circulating water pump 12, heat is exchanged in a plate heat exchanger 11, heat is transferred to the circulating water of one network,

one net sends water into a cooling tower 14 through a circulating water pump 13 for heat dissipation, and the purpose of system cooling is achieved.

The cooling water outlet pipeline of the ozone generator 9 is provided with a flow switch and a temperature transmitter, and the ozone generator gives an alarm when the flow of the cooling water is insufficient and the temperature exceeds a set value.

4. Ozone mixing reaction unit

Ozone is prepared by an ozone generator 9 and is sent to an ozone mixer 15 through a stainless steel pipeline, an ozone gas is uniformly distributed on the section of a flue gas pipeline by a gas distribution device, so that the ozone and the flue gas containing NOX are fully mixed in the flue gas pipeline and generateAnd (4) carrying out oxidation reaction. NO in the smoke_XOxidation to readily absorbable NO₂And N₂O₅。

NO₂And N₂O₅Enters a reaction absorber 27 through a flue, a desulfurization feeder 23 and a V-shaped mixer 25, and NO is obtained₂And N₂O₅The sodium nitrite is easy to dissolve in water to form nitric acid or nitrous acid, and the nitric acid or nitrous acid and calcium hydroxide serving as a desulfurizing agent undergo acid-base neutralization reaction to complete absorption reaction and denitration process, and are discharged along with desulfurization ash.

Therefore, the support of the desulfurization process can not be separated in the ozone denitration, and the desulfurization and denitration can be removed together by adopting the ozone denitration.

5. Smoke and air unit

The flue gas containing NOX enters an ozone mixer 15 through a flue gas pipeline to be fully mixed with ozone and carry out oxidation reaction, and NO in the flue gas is treated_XOxidation to readily absorbable NO₂And N₂O₅The desulfurizer calcium hydroxide is added into the desulfurization feeder 23 through the flue, and is sufficiently and rapidly atomized and mixed with the flue gas in the V-shaped mixer 25, enters the reaction absorber 27, and is subjected to a dissolution reaction with water sprayed out of the atomizing spray gun 31, SO₂、NO₂And N₂O₅The water-soluble sulfur dioxide is easy to dissolve in water to form sulfuric acid or sulfurous acid, nitric acid or nitrous acid, the sulfuric acid or sulfurous acid and calcium hydroxide serving as a desulfurizing agent are subjected to acid-base neutralization reaction in a reaction absorber 27 to complete the desulfurization and denitration processes of absorption, the solid-gas separation is carried out through a bag-type dust collector (cyclone bag-type dust collector) 32, and the filtered clean gas which reaches the emission standard enters a chimney 40 through a draught fan 39 (comprising a compensator, a flue and a damper) and is discharged out of the atmosphere.

6. Electrical and meter control unit

The low-voltage component adopts a good brand product with excellent performance and stable and reliable quality, the electrical equipment is arranged in a room with clean environment, and the protection grade of the shell of the electrical equipment is IP 30; electrical and lighting equipment under the remaining environmental conditions, with a protection rating of IP 54; the protection grade of the electrical equipment in the extreme area with the severe dusty environment is IP 65.

The cable plant complies with the relevant standards and specifications. The cable adopts the laying modes of cable channels, cable bridges (hot galvanizing), underground buried pipes and cable direct burial according to the actual engineering conditions. The buried cable is provided with permanent marks on the ground every 15m or so. The 0.4kV power cable, the control cable, the signal cable and the like are laid in layers (or separated) according to relevant standards and specifications. The bridge frame adopts a step type bridge frame.

The system is controlled by a PLC or a DCS, the working modes of the equipment are divided into an automatic working state, a remote manual state and an on-site manual state, and an on-site electric control system can independently complete all functions. The instrument adopts the quality brand products with excellent performance and stable and reliable quality, and the operating state parameters of the equipment (including voltage, liquid level, temperature, pressure, flow, vibration detection, fault alarm, host current, host operation, host stop and the like) are monitored or set remotely. The electrical control requires an Ethernet interface, which is convenient for networking. The upper computer is provided with an operation station and an engineer station, data are automatically stored in a database, key data exceed the standard and automatically alarm, a report is automatically generated, and functions such as operation curves in any time period can be retrieved at any time.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a SOx/NOx control device based on flue gas semidry method which characterized in that includes:

the desulfurizer supply unit comprises a desulfurizer bin (16), a spiral metering scale (18), an air conveying chute (19), a high-pressure centrifugal blower (20), a star-shaped discharger (17), an air lifting pump (21), a feeder (23) and a Roots blower (22), wherein the desulfurizer bin (16) is used for storing desulfurizer, the spiral metering scale (18) is used for weighing desulfurizer conveyed from the desulfurizer bin (16), conveying the desulfurizer to the upper end of the air conveying chute (19) and then feeding the desulfurizer into a material chamber of the air conveying chute (19), the high-pressure centrifugal blower (20) is used for blowing air to an air chamber positioned at the lower layer in the air conveying chute (19) to enable powder to be in a suspended state, the air conveying chute (19) has an inclination to enable the desulfurizer to flow to the star-shaped discharger (17) automatically on the air conveying chute (19), the powder enters the air-lift pump (21), the upper part of the air-lift pump (21) is a pump body, the lower part of the air-lift pump is a gasification chamber supplied with air by the Roots blower (22), a porous air-permeable plate is arranged between the upper part and the lower part, the powder in the star-shaped discharger (17) enters the upper pump body of the air-lift pump (21), the gasification chamber at the lower part of the air-lift pump (21) conveys the airflow of the Roots blower (22) to the pump body at the upper part through the porous air-permeable plate, so that the powder is fluidized, the high-pressure airflow of the material passing through the Roots blower (22) is conveyed to a feeder (23) through a conveying pipe, and the high-pressure airflow is sprayed out by a nozzle (24) in the feeder (23;

desulfurizer reaction absorption unit, desulfurizer reaction absorption unit includes V type blender (25), reaction absorber (27), water tank (28), high pressure water pump (29), spray gun (31), row's sediment ware (26), V type blender (25) and charging means (23) intercommunication, the flue gas of nozzle (24) spun of charging means (23) gets into and atomizes in V type blender (25) and mixes, and gets into in reaction absorber (27), high pressure water pump (29) pressurize the running water in water tank (28) to spray through spray gun (31) of locating in reaction absorber (27), make SO in the flue gas₂The slag extractor (26) is used for collecting and removing scabs dropped from the reaction absorber (27);

the ozone mixing reaction unit comprises an ozone generator (9) and an ozone mixer (15), wherein the ozone generator (9) is used for generating ozone and conveying the ozone into the ozone mixer (15), and the ozone mixer (15) is communicated with a feeder (23).

2. The desulfurization and denitrification device based on the flue gas semi-dry method as claimed in claim 1, wherein a bag-type dust collector (36) at the top of the desulfurizing agent bin (16) is arranged.

3. The desulfurization and denitrification facility based on the flue gas semidry method as claimed in claim 1, wherein the inner wall of the reaction absorber (27) is coated with wear-resistant ceramic.

4. The desulfurization and denitrification apparatus based on the semi-dry flue gas process as claimed in claim 1, wherein the atomizing spray gun (31) is of a single-fluid backflow type structure.

5. The desulfurization and denitrification device based on the flue gas semi-dry process as claimed in claim 1, wherein the water tank (28) is communicated with the reaction absorber (27) through a water pipe, and a water return regulating valve (30) is arranged on the water pipe, and the water return regulating valve (30) is used for regulating the water supply pressure in the water pipe.