CN103418234A - Exhaust gas treatment system and method of using same - Google Patents

Abstract

The invention provides an exhaust gas treatment system and a using method thereof, which comprises a circulating fluidized bed semi-dry type deacidification device and an inert substance in the circulating fluidized bed semi-dry type deacidification device. The invention utilizes the design that the waste gas treatment system contains inert substances, when the waste gas treatment system is used, the inert substances and an alkaline agent form a fluidized composition for removing dioxin, thereby solving the problem that the alkaline agent is adhered to the inner wall of a reactor when a gas suspension absorption device (GSA) is applied to the treatment of waste gas for a long time, improving the practical operation possibility that the GSA and the alkaline agent are used for removing acid gas, and proving that the fluidized composition for removing dioxin can be utilized to achieve the aim of effectively treating gas-phase dioxin in the waste gas.

Description

Exhaust gas treatment system and method of use thereof

technical field

The invention relates to a waste gas treatment system, in particular to a high-efficiency system for treating gas-phase dioxins in waste gas. The invention also relates to methods of using exhaust gas treatment systems.

Background technique

Colorless and odorless dioxin is the poison of the century. It is produced in the waste gas caused by combustion. Dioxin exists in animals or fruits and vegetables, and then enters the human body through the food chain and is absorbed by the human body, causing many liver, immune system, muscle and joint diseases. Pain, miscarriage, deformed children, visual impairment and other diseases, so the treatment of dioxin is one of the most attention-grabbing problems now.

The exhaust gas produced by incinerators or other combustion systems contains acid gases and toxic gases of dioxins. Generally, an alkaline agent absorption tower is used to remove acid gases, and activated carbon is used to absorb dioxins, and then the bag filter (bag filter) Activated carbon to remove particulate matter and adsorbed pollutants.

Alkaline agent absorption towers generally use dry or semi-dry absorption towers, and the gas suspension absorber (GSA) is a type of semi-dry absorption tower, which includes a reactor, A storage tank (storage) and a cyclone dust collector (cyclone), wherein the alkaline agent used is calcium hydroxide (Ca(OH) ₂ ), the use process of GSA is that the alkaline agent is injected into the reactor from the alkaline agent storage tank, The alkaline agent reacts with the acid gas in the reactor to achieve the purpose of removing the acid gas. At this time, the alkaline agent in the reactor will show "flowing with air flow", "fluidization" and "fluidization" according to the particle size of small, medium and large in the reactor Falling" and other three states. Part of the small particle size alkali agent flowing with the airflow will be collected by the cyclone dust collector and returned to the alkali agent storage tank for reuse, while part of the small particle size alkali agent flowing with the airflow will be discharged from the gas suspension absorption device. The fluidized medium-sized alkaline agent will not remain fluidized for a long time, because it will agglomerate with other granular materials or alkaline agents to form a large particle size and then fall naturally, and the dropped large particle size will be discharged from the pipe below the reactor .

The exhaust gas that removes acid gas through the GSA system then enters the activated carbon injection pipeline (active carbon injector, ACI) to remove gaseous dioxins in the exhaust gas, and the exhaust gas then flows through the bag filter (BF) system to remove particulates in the exhaust gas. Activated carbon for substances and adsorbed pollutants.

This GSA has been developed for decades. Compared with other systems for treating dioxin in waste gas, it has the advantages of simple device and cheap equipment, but its biggest disadvantage is that in actual operation, when the alkali agent is injected into the reactor, the alkali The agent is easy to stick to the tube wall of the reactor, causing the inner diameter of the tube wall of the reactor to become smaller, which leads to an increase in the pressure loss of the GSA system. The alkali agent on the pipe wall of the reactor, and because the alkali agent is easy to stick, it causes the problem of unstable granulation of the alkali agent in the reactor, that is, the small particle size alkali agent that the alkali agent flows with the airflow in the reactor It will be greatly reduced, which will affect the efficiency of acid gas removal by alkaline agents. In addition, gas-phase dioxins in dioxins were previously removed by adsorption with activated carbon, so a large amount of activated carbon was required to remove gas-phase dioxins in the ACI system. In addition, because activated carbon is injected into the activated carbon pipeline and flows through the pipeline in a steady flow, the efficiency of activated carbon to adsorb dioxin in the exhaust gas is not good, so even if an excessive amount of activated carbon is used, the gaseous dioxin in the exhaust gas cannot be effectively removed , while increasing the cost of activated carbon.

Contents of the invention

In order to make the GSA and ACI system more widely and more efficiently used to remove acid gas, and at the same time treat the dioxin in the waste gas, especially the gaseous dioxin. The purpose of the present invention is to provide an exhaust gas treatment system that can be used in an exhaust gas treatment system, which has a stable and high acid removal efficiency, effectively removes dioxins, and can reduce the consumption of activated carbon at the same time.

An exhaust gas treatment system of the present invention, comprising:

A circulating fluidized bed semi-dry scrubber equipment (circulating fluidized bed semi-dry scrubber equipment), which includes a reactor, a dust collection equipment connected to the reactor, a dust collection equipment connected to the reactor and the A circulation storage tank and an alkali agent injection device connected to the reactor, the reactor can be used for inputting a waste gas, and the alkali agent injection device can be used for input of alkali agent;

An inert substance is accommodated in the circulation storage tank.

According to the present invention, the inert substance mentioned in the present invention refers to any substance that does not react with the alkali agent.

According to the present invention, the density of the inert substance described in the present invention is, for example but not limited to, between 1.5 and 2.8 g/cm2. More preferably, the density of the inert substance is, for example but not limited to, between 2.5 and 2.6 g/cm2.

According to the present invention, the particle size of the inert substance in the present invention is, for example but not limited to, between 0.01 millimeter (mm) and 5 mm.

According to the present invention, the dust collection equipment described in the present invention refers to a device that can separate the inert substances and alkali agents in the airflow from the gas after the air flow containing gas, inert substances and alkali agents passes through the dust collection equipment, such as , but not limited to gravity dust collectors, inertial dust collectors or cyclone dust collectors.

According to the present invention, the inertial dust collector described in the present invention is, for example but not limited to, an elbow type inertial dust collector, a louver type inertial dust collector or a multi-layer type inertial dust collector. Preferably, the waste gas contains gas phase dioxin.

Preferably, the alkaline agent is selected from the group consisting of calcium hydroxide, magnesium hydroxide, calcium carbonate and combinations thereof.

Preferably, the inert material is particulate material.

Preferably, wherein the particulate matter is mineral sand.

Preferably, the ore sand is selected from the group consisting of iron sand, quartz sand and combinations thereof.

According to the present invention, the main component of the quartz sand in the present invention is silicate, such as but not limited to calcium silicate.

Preferably, the mineral sand is quartz sand.

Preferably, the particle size of the inert substance is between 0.01 mm and 5 mm. More preferably, the particle size of the inert substance is between 0.05 millimeter (mm) and 0.15 mm.

Preferably, the dust collection device is selected from the group consisting of: gravity dust collector, inertial dust collector and cyclone dust collector.

More preferably, the dust collecting device is a cyclone dust collector.

Preferably, it also includes an activated carbon adsorption device connected to the dust collection device, the activated carbon adsorption device includes a conveying pipe connected to the dust collecting device, an injection pipe connected to the conveying pipe, and an injection pipe connected to the injection pipe. An activated carbon warehouse connected by pipes, wherein the conveying pipe has an activated carbon injection port and at least one flow disturbance structure, the activated carbon injection port is located between the dust collection equipment and the at least one flow disturbance structure, and the part has the at least one flow disturbance structure The passage cross-sectional area of the conveying pipe of a disturbing flow structure is smaller than the passage cross-sectional area of the conveying pipe in other parts.

Preferably, the at least one flow turbulence structure is formed by part of the pipe wall of the conveying pipe protruding toward the channel of the conveying pipe.

Preferably, the at least one flow disturbing structure is a protrusion, and the protrusion is arranged on the inner wall of the delivery pipe.

Preferably, the ratio of the inner diameter of the narrowest channel of the part of the delivery pipe having the at least one flow turbulence structure to the inner diameter of the other part of the delivery pipe is between 0.5 and 0.8.

Preferably, it also includes a bag-type dust collector connected to the conveying pipe of the activated carbon adsorption device, wherein the at least one disturbing structure is located between the activated carbon inlet and the bag-type dust collector.

According to the present invention, the bag dust collector described in the present invention is, for example but not limited to, a mechanical vibration bag dust collector, an air backwash bag dust collector, or a pulse bag dust collector.

The present invention also provides a method of using an exhaust gas treatment system, comprising the steps of:

Complete the aforementioned waste gas treatment system;

A dioxin-removing composition is passed into the reactor, the dioxin-removing composition contains the inert substance and the alkali agent, and the dioxin-removing composition is circulated in the circulating fluidized bed for semi-dry acid removal inside the device;

An exhaust gas is input into the reactor, and the exhaust gas is mixed with the dioxin-removing composition in the reactor to remove the dioxin in the exhaust gas.

According to the present invention, the dioxin-removing composition of the present invention is formed by the collision of alkaline agent and inert substance in the reactor, which includes but not limited to: alkaline agent particles, inert substance particles, and alkali sticking to the surface of the inert substance particle.

Preferably, introducing a dioxin-removing composition into the reactor also includes circulating an inert substance in the reactor, the circulation storage tank and the dust collection equipment;

An alkaline agent is input into the reactor from the alkaline agent injection device, and mixed with the inert substance to form the dioxin-removing composition.

According to the present invention, the method of using the exhaust gas treatment system of the present invention can adjust the pressure loss of the two devices of the circulating fluidized bed semi-dry acid removal device and the activated carbon adsorption device by using the addition amount of the inert substance.

According to the present invention, the method of using the exhaust gas treatment system of the present invention can utilize adjusting the pressure loss of the two devices of the circulating fluidized bed semi-dry acid removal device and the activated carbon adsorption device, adjusting the wind speed of the reactor, adjusting the inert material The size of the particle size and the adjustment of parameters such as the density of the inert substance allow the inert substance to circulate in the reactor, the circulation storage tank and the dust collection equipment.

According to the present invention, the waste gas is mixed with the dioxin-removing composition in the reactor to remove dioxin in the waste gas, and the dioxin-removing waste gas and the dioxin-removing composition pass through the dust collection equipment of the present invention to remove dioxin The waste gas will be separated from part of the small-sized dioxin-removing composition, and the small-sized dioxin-removing composition will enter the circulation storage tank and continue to circulate in the reactor, the circulation storage tank and the dust collection equipment.

According to the present invention, the addition amount of the alkaline agent of the present invention is, for example but not limited to, 1 to 5 grams/cubic meter (g/m ³ ), more preferably, for example but not limited to, 1 to 3 g/m ³ .

Preferably, the pressure loss of the two devices of the circulating fluidized bed semi-dry acid removal device and the activated carbon adsorption device is maintained between 160 and 320 millimeters of water column (mmAq), and the wind speed of the reactor is 6 Between 10 m/s and 10 m/s, the residence time of exhaust gas in the reactor is between 1 second and 3 seconds.

More preferably, the wind speed of the reactor is between 6 and 10 m/s, and the particle size of the inert substance is between 0.02 and 5 mm. More preferably, the wind speed of the reactor is 7-9 m/s, and the particle size of the inert substance is between 0.05-0.15 mm.

The advantage of the present invention is that, utilizing the design in which the inert substance is accommodated in the circulation storage tank, when the exhaust gas treatment system of the present invention is in use, the inert substance and the alkali agent provided by the alkali agent injection device form a fluidized removal The dioxin-removing composition makes it difficult for the alkaline agent in the dioxin-removing composition to stick to the inner wall of the reactor in the reactor, so that the dioxin-removing composition of the present invention is easy to circulate in the reactor, circulation storage tank and In the dust collection equipment, the probability of collision with the exhaust gas will be increased, and the efficiency of removing dioxins in the exhaust gas will be greatly improved, especially the efficiency of removing gas phase dioxins will be greatly improved. Reduce the amount of activated carbon used, thereby greatly reducing the cost, and the composition for removing dioxin, especially the inert substance particles, is not easily cracked because it does not react with the alkali agent in the circulating fluidized bed semi-dry acid removal device It can be turned into a fine powder, which can be recycled in the fluidized bed semi-dry acid removal device for continuous use, and it can also respond to the concept of environmental protection and reduce costs. The present invention utilizes the design of the inert substance contained in the circulating storage tank, so that when the exhaust gas treatment system of the present invention is in use, the inert substance and the alkali agent provided by the alkali agent injection device form a fluidized composition for removing dioxin , to solve the long-standing problem that the alkali agent sticks to the inner wall of the reactor when the GSA system is used to treat waste gas, which can greatly reduce the frequency of the overall device shutdown, and improve the possibility of the GSA system being applied to the practical operation of waste gas treatment, and remove dioxin The composition also has the effect of treating gaseous dioxins in exhaust gas. The waste gas treatment system of the present invention has the advantage of using the GSA system for low cost when treating waste gas, and improves the biggest shortcoming that the alkali agent sticks to the inner wall of the reactor when it is used, so when treating waste gas, the cost is greatly reduced, and Its removal efficiency of dioxin is good, especially the removal efficiency of gas phase dioxin.

In addition, the present invention utilizes the design of the turbulence structure in the activated carbon adsorption device. Because the channel cross-sectional area of the delivery pipe with the turbulence structure in this part is smaller than the channel sectional area of the delivery pipe in other parts, the waste gas and the activated carbon pass through the turbulence. When the structure is formed, the probability of collision between the two increases, which increases the efficiency of activated carbon to adsorb gas-phase dioxins in waste gas, so that activated carbon can maximize its effectiveness, and the efficiency of treating gas-phase dioxins in waste gas is greatly improved.

Furthermore, the present invention utilizes the design of a bag filter in the exhaust gas treatment system to remove solid-phase dioxins in the exhaust gas, so that the total concentration of dioxins in the exhaust gas after final treatment is much lower than 0.1ngI-TEQ/ Nm ³ .

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Fig. 1 is the schematic diagram of a preferred embodiment of the present invention;

Fig. 2 is the schematic diagram of another preferred embodiment of the present invention;

Fig. 3 is the schematic diagram of the use state of the present invention;

Fig. 4 is a schematic diagram of another preferred embodiment of the present invention.

Among them, reference signs

1 Exhaust gas treatment system

10 Circulating fluidized bed semi-dry acid removal device

11 reactors

12 Dust collection equipment 13 Circulation storage tank

14 Alkali injection device

20 inert substances

30 Activated carbon adsorption device 31 Delivery pipe

311 activated carbon injection port

312 spoiler structure 32 injection pipe

33 Activated carbon bin 40 Bag type dust collector

50 conduction tube 60 boiler

70 induced fan 80 chimney

P1 sampling point P2 sampling point

P3 sampling point

Detailed ways

In order to understand the technical features and practical functions of the present invention in detail, and implement them according to the contents of the description, please refer to the preferred embodiments to illustrate the technical means used by the present invention to achieve the purpose.

Exhaust gas treatment system of the present invention

Example 1

Referring to Fig. 1, the waste gas treatment system 1 of the present embodiment includes a circulating fluidized bed semi-dry acid removal device 10 (circulating fluidized bed semi-dry scrubber equipment), an inert substance 20, an activated carbon adsorption device ( active carbon absorber equipment, ACAE) 30, and a bag dust collector 40.

The aforementioned circulating fluidized bed semi-dry acid removal device 10 includes a reactor 11, a collection equipment dust 12 connected with the reactor 11, a circulation storage tank 13 connected with the reactor 11 and the dust collection equipment 12 And an alkali agent injection device 14 connected with the reactor 11, the reactor 11 can be used to import a waste gas, and the alkali agent injection device 14 can be used to import an alkali agent. In the present embodiment, the dust collection equipment 12 is It is a cyclone dust collector.

The aforementioned inert substance 20 is contained in the circulation storage tank 13 and is quartz sand with a particle size between 0.2 millimeters (mm) and 3 mm.

The aforementioned active carbon adsorption device 30 is connected with the dust collection equipment 12 of the circulating fluidized bed semi-dry acid removal device 10, and it includes a delivery pipe 31 connected with the dust collection equipment 12, a delivery pipe connected with the delivery pipe 31 connected to the injection pipe 32 and an activated carbon storehouse 33 connected to the injection pipe 32, the delivery pipe 31 has two ends, an activated carbon injection port 311 and two spoiler structures 312, wherein one end of the delivery pipe 31 is connected to The dust collection device 12 is connected, the activated carbon injection port 311 is the interface where the delivery pipe 31 and the injection pipe 32 are connected, and the activated carbon injection port 311 is located at the dust collection device 12 and the two spoiler structures 312 Between, the two turbulence structures 312 are formed by part of the pipe wall of the delivery pipe 31 protruding toward the channel of the delivery pipe 31, and there is a distance between the two turbulence structures 312, wherein the part has one of The passage cross-sectional area of the delivery pipe 31 of the spoiler structure 312 is smaller than the passage cross-sectional area of the delivery pipe 31 of other parts, and this part has the narrowest passage inner diameter of the delivery pipe 31 of one of the spoiler structures 312 and the other parts The ratio of the inner diameter of the delivery tube 31 is 0.7.

The aforementioned bag-type dust collector 40 is connected to the other end of the delivery pipe 31 of the activated carbon adsorption device 30 away from the dust collection device 12, so that the two spoiler structures 312 are located at the activated carbon injection port 311 and the bag dust collector 40.

Example 2

Please refer to Fig. 2, the difference between the exhaust gas treatment system of this embodiment and Embodiment 1 is that the inner wall of the conveying pipe 31 is provided with a plurality of spoiler structures 312, and these spoiler structures 312 are protrusions, and the The channel cross-sectional area of the part of the delivery pipe 31 with the bump is smaller than the channel sectional area of the other part of the delivery pipe 31 .

Example 3

The waste gas treatment system of this embodiment is different from that of Embodiment 1 in that the dust collection device 12 is a louver type inertial dust collector.

Application of the waste gas treatment system of the present invention

Please refer to Fig. 3, when the exhaust gas treatment system 1 of Embodiment 1 of the present invention is used in an incinerator, the circulating fluidized bed semi-dry acid removal device 10 is connected with a boiler 60 by a conduction pipe 50, and a The induced fan 70 is connected with the bag dust collector 40 , and a chimney 80 is connected with the induced fan 70 .

Method of using exhaust gas treatment system of the present invention

Example 1

Please refer to shown in Fig. 4, complete the aforesaid incinerator that waste gas treatment system 1 of the present invention is equipped with, the quartz sand that will be positioned at circulation storage tank 13 injects wind speed and is 6 to 10 meters per second (m/s) and temperature Reactor 11 between about 140 DEG C to 180 DEG C, make quartz sand circulate in this reactor 11, dust collection equipment 12 and circulating storage tank 13, wherein the addition amount of quartz sand is to make the waste gas of the present invention The circulating fluidized bed semi-dry acid removal device 10 in the treatment system 1 and the pressure loss of the activated carbon adsorption device 30 are maintained between 160 to 330 millimeters of water column (mmAq), and the alkali agent is input into the reaction by the alkali agent injection device 14 Device 11, wherein the alkali agent is calcium hydroxide, its water content is 20%, and its addition is 1 to 3 grams/cubic meter (g/m ³ ), quartz sand and the alkali agent in reactor 11 internal mixing to form a dioxin-removing composition, and then the waste gas is discharged from the boiler 60 through the conduction pipe 50, and then flows into the reactor 11. At this time, the waste gas and the dioxin-removing composition are mixed in the reactor 11, and the dioxin-removing composition The waste gas collides with the waste gas in the reactor 11 to remove the dioxin in the waste gas to achieve the effect of treating acid gas such as hydrogen chloride and sulfide and dioxin in the waste gas, wherein the residence time of the waste gas in the reactor is between 1 second and 3 seconds.

In addition, the dioxin-removing composition collides with the exhaust gas in the reactor 11 , so that the dioxin-removing composition includes alkali agent particles of different sizes, quartz sand particles, and alkali-adhered particles on the surface of the quartz sand. Among them, the large-sized dioxin-removing composition will be discharged through the bottom of the reactor 11 due to gravity, and part of the medium-sized dioxin-removing composition, especially quartz sand particles, will show a fluidization phenomenon during the waste gas treatment. The circulating fluidized bed semi-dry acid removal device 10 of system 1 circulates inside, and some of the medium-sized dioxin-removing components collide with the waste gas and other dioxin-removing components of various sizes to form large-sized dioxin-removing components. The dioxin-removing composition is then discharged through the bottom of the reactor 11, and part of the medium-sized dioxin-removing composition collides with the exhaust gas and other dioxin-removing compositions of various sizes and will be fragmented into small-sized dioxin-removing compositions Part of the small-sized dioxin-removing components, especially quartz sand particles, will flow with the airflow and be collected by the cyclone dust collector, and in the circulating fluidized bed half of the waste gas treatment system 1 The dry acid removal device 10 is circulated, and part of the small-sized dioxin-removed composition will be discharged by the dust collection device 12 into the circulating fluidized bed semi-dry acid removal device 10 .

The exhaust gas treated by removing the composition of dioxin enters the delivery pipe 31 in the activated carbon adsorption device 30 through the cyclone dust collector 12, and the activated carbon in the activated carbon storehouse 33 is 50 to 200 mg/m3. The amount of addition enters the delivery pipe 31 by the activated carbon injection port 311 through the injection pipe 32, wherein the wind speed in the delivery pipe 31 is 20 meters per second (m/sec), and the waste gas and activated carbon are just carried out in the delivery pipe 31. Collision, when the two pass through the turbulence structure 312 provided in the delivery pipe 31, since the passage cross-sectional area of the delivery pipe 31 here is smaller than that of other delivery pipes 31, the collision probability of the two will increase, and then Increase the effect of activated carbon to adsorb gaseous dioxins in exhaust gas.

The exhaust gas adsorbed by the activated carbon flows through the bag filter 40 to remove solid-phase dioxins in the exhaust gas, and finally is discharged from the chimney 80 through the induced fan 70 .

Embodiment 2 Using the method of using the exhaust gas treatment system in Embodiment 1 to treat waste 1

The source of exhaust gas in this embodiment is combustion waste 1 .

Please refer to Fig. 3, in this embodiment, a sampling point is set in the conduction pipe 50, its number is P1, another sampling point is set in the delivery pipe 31 and in front of the turbulence structure 312, its number is P2, in Another sampling point is set in the chimney 80, and its number is P3.

The sampling method of this embodiment is to set filter screens at these sampling points, collect solid phase samples at the filter screens, and collect gas phase samples behind the filter screens. The samples of this embodiment are based on NIEA A807.75C "discharge pipe Sampling method for dioxins and furans in the sample, and tested according to A808.74B "Detection method for dioxins and furans in discharge pipes". The test results for dioxins are shown in Table 1 below.

Table 1 Sampling and testing results of treatment waste 1

It can be seen from Table 1 that the gas phase dioxin concentration of sampling point number P1 is 5.95

ngI-TEQ/Nm ³ , the solid-phase dioxin concentration was 24.2ngI-TEQ/Nm ³ , and the total dioxin concentration was 30.2ngI-TEQ/Nm ³ . Sampling point number P2, that is, after the exhaust gas has been treated by the circulating fluidized bed semi-dry acid removal device 10 in the exhaust gas treatment system 1 of the present invention and the composition for removing dioxin, the concentration of dioxin in the gas phase has been reduced to 0.127ngI-TEQ /Nm ³ , and the solid-phase dioxin concentration has been reduced to 6.04ngI-TEQ/Nm ³ , it can be seen that the composition for removing dioxin has a very good effect on gas-phase dioxin in the circulating fluidized bed semi-dry acid removal device 10 The removal efficiency is as high as 98%. Sampling point number P3, that is, the gas-phase dioxin concentration of the waste gas treated by the activated carbon adsorption device 30 and the bag filter 40 in the waste gas treatment system 1 of the present invention has been reduced to 0.0256ngI-TEQ/Nm ³ , The solid-phase dioxin concentration has been reduced to 0.0158ngI-TEQ/Nm ³ , and the final total dioxin concentration is 0.0414ngI-TEQ/Nm ³ . Accordingly, the waste gas treatment system 1 of the present invention has a treatment efficiency of 99.5% for gas-phase dioxins in waste gas, and a removal efficiency of 99.5% for gas-phase dioxins and solid-phase dioxins.

Embodiment 3 Utilize the method of the exhaust gas treatment system of embodiment 1 to process waste 2

The difference between this embodiment and embodiment 2 is that the source of waste gas in this embodiment is waste 2, and the detection results of dioxin are shown in Table 2 below.

Table 2 Sampling and testing results of treatment waste 2

It can be seen from Table 2 that the gas phase dioxin concentration of sampling point number P1 is 6.87

ngI-TEQ/Nm ³ , the solid-phase dioxin concentration was 17.7ngI-TEQ/Nm ³ , and the total dioxin concentration was 24.6ngI-TEQ/Nm ³ . Sampling point number P2, that is, after the exhaust gas has been treated by the circulating fluidized bed semi-dry acid removal device 10 in the exhaust gas treatment system 1 of the present invention and the composition for removing dioxin, the concentration of dioxin in the gas phase has been reduced to 0.360ngI-TEQ /Nm ³ , and the solid-phase dioxin concentration has been reduced to 5.45ngI-TEQ/Nm ³ , it can be known that the dioxin-removing composition has a fairly good effect on gas-phase dioxin in the circulating fluidized bed semi-dry acid removal device 10 The removal efficiency is as high as 95%. Sampling point number P3, that is, the gas phase dioxin concentration of the waste gas treated by the activated carbon adsorption device 30 and the bag filter 40 in the waste gas treatment system 1 of the present invention has been reduced to 0.0350ngI-TEQ/Nm ³ , The solid-phase dioxin concentration has been reduced to 0.0184ngI-TEQ/Nm ³ , and the final total dioxin concentration is 0.0533ngI-TEQ/Nm ³ . Accordingly, the waste gas treatment system 1 of the present invention has a treatment efficiency of 99.5% for gas-phase dioxins in waste gas, and a removal efficiency of 99.5% for gas-phase dioxins and solid-phase dioxins.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (25)

1. A waste gas treatment system, characterized in that, comprising: A circulating fluidized bed semi-dry acid removal device, which includes a reactor, a dust collection device connected to the reactor, a circulation storage tank connected to the reactor and the dust collection device, and a reactor connected to the reactor The connected alkali agent injection device, the reactor can be used to input a waste gas, and the alkali agent injection device can be used to input alkali agent; An inert substance is contained in the circulation storage tank. 2. The waste gas treatment system according to claim 1, characterized in that the waste gas contains gaseous dioxins. 3. The exhaust gas treatment system according to claim 1, wherein the alkaline agent is selected from the group consisting of calcium hydroxide, magnesium hydroxide, calcium carbonate and combinations thereof. 4. The exhaust gas treatment system according to claim 1, wherein the inert substance is particulate matter. 5. The exhaust gas treatment system of claim 4, wherein the particulate matter is mineral sand. 6 . The waste gas treatment system according to claim 5 , wherein the ore sand is selected from the group consisting of iron sand, quartz sand, and combinations thereof. 7. The exhaust gas treatment system according to claim 5, wherein the mineral sand is quartz sand. 8. The exhaust gas treatment system according to any one of claims 1-7, characterized in that the particle size of the inert substance is between 0.01 mm and 5 mm. 9. The exhaust gas treatment system according to claim 8, wherein the dust collecting device is selected from the group consisting of gravity dust collector, inertial dust collector and cyclone dust collector. 10. The exhaust gas treatment system according to claim 9, characterized in that the dust collecting device is a cyclone dust collector. 11. The exhaust gas treatment system according to claim 1, further comprising an activated carbon adsorption device connected to the dust collection device, the activated carbon adsorption device comprising a delivery pipe connected to the dust collection device, a An injection pipe connected to the delivery pipe and an activated carbon chamber connected to the injection pipe, wherein the delivery pipe has an activated carbon injection port and at least one spoiler structure, the activated carbon injection port is located at the dust collection equipment and the at least Between a flow turbulence structure, the channel cross-sectional area of the conveying pipe with the at least one flow disturbing structure in this part is smaller than the channel cross-sectional area of the conveying pipe in other parts. 12 . The exhaust gas treatment system according to claim 11 , wherein the at least one flow turbulence structure is formed by part of the pipe wall of the conveying pipe protruding toward the channel of the conveying pipe. 13 . 13 . The exhaust gas treatment system according to claim 11 , wherein the at least one flow disturbing structure is a protrusion, and the protrusion is disposed on the inner wall of the delivery pipe. 14 . 14. The exhaust gas treatment system according to any one of claims 11 to 13, wherein the part has the narrowest channel inner diameter of the delivery pipe of the at least one flow turbulence structure and the inner diameter of the delivery pipe of the other part The ratio is between 0.5 and 0.8. 15. The exhaust gas treatment system according to claim 14, further comprising a bag filter connected to the conveying pipe of the activated carbon adsorption device, wherein the at least one disturbance structure is located at the activated carbon injection between the inlet and the baghouse. 16. A method of using an exhaust gas treatment system, comprising the steps of: Prepare a waste gas treatment system as described in any one of claims 1 to 10; A dioxin-removing composition is passed into the reactor, the dioxin-removing composition includes the inert substance and the alkali agent, and the dioxin-removing composition is circulated in the circulating fluidized bed semi-dry acid removal device ; An exhaust gas is input into the reactor, and the exhaust gas is mixed with the dioxin-removing composition in the reactor to remove the dioxin in the exhaust gas. 17. The method of using an exhaust gas treatment system according to claim 16, wherein the introduction of a dioxin-removing composition into the reactor further includes making an inert substance in the reactor and the dust collection equipment and circulation in the circulation storage tank; An alkaline agent is input into the reactor from the alkaline agent injection device, and mixed with the inert substance to form the dioxin-removing composition. 18. The method of using the exhaust gas treatment system according to claim 17, characterized in that, in the exhaust gas treatment system according to any one of claims 1 to 8, the exhaust gas treatment system further comprises a An activated carbon adsorption device connected to dust collection equipment, the activated carbon adsorption device includes a delivery pipe connected to the dust collection equipment, an injection pipe connected to the delivery pipe, and an activated carbon chamber connected to the injection pipe, wherein the The delivery pipe has an activated carbon injection port and at least one spoiler structure, the activated carbon injection port is located between the dust collection equipment and the at least one spoiler structure, and this part has the channel of the transport pipe with the at least one spoiler structure The cross-sectional area is smaller than the channel cross-sectional area of the delivery pipe in other parts. 19. The method for using an exhaust gas treatment system according to claim 18, characterized in that, the at least one turbulence structure in the exhaust gas treatment system is formed by part of the pipe wall of the delivery pipe protruding toward the channel of the delivery pipe 20 . The method for using an exhaust gas treatment system according to claim 18 , wherein the at least one flow disturbance structure in the exhaust gas treatment system is a protrusion, and the protrusion is disposed on the inner wall of the delivery pipe. 21 . 21. The method of using an exhaust gas treatment system according to any one of claims 18 to 20, characterized in that the narrowest channel inner diameter of the conveying pipe with the at least one turbulence structure in the exhaust gas treatment system is equal to The ratio of the inner diameter of the delivery pipe in the other part is between 0.5 and 0.8. 22. The method of using an exhaust gas treatment system according to claim 21, characterized in that, the exhaust gas treatment system further comprises a bag filter connected to the delivery pipe of the activated carbon adsorption device, wherein the at least one disturber A flow structure is located between the activated carbon injection port and the baghouse. 23. The method of using an exhaust gas treatment system according to any one of claims 18 to 20, wherein the pressure loss of the circulating fluidized bed semi-dry acid removal device and the activated carbon adsorption device is It is maintained between 160 and 320 mm water column, the wind speed of the reactor is between 6 and 10 m/s, and the residence time of exhaust gas in the reactor is between 1 second and 3 seconds. 24. The method of using an exhaust gas treatment system according to claim 21, characterized in that the pressure loss of the circulating fluidized bed semi-dry acid removal device and the activated carbon adsorption device is maintained at 160 to 320 mm Between the water column, the wind speed of the reactor is between 6 and 10 m/s, and the residence time of the waste gas in the reactor is between 1 second and 3 seconds. 25. The method of using an exhaust gas treatment system according to claim 22, characterized in that the pressure loss of the circulating fluidized bed semi-dry acid removal device and the activated carbon adsorption device is maintained at 160 to 320 mm Between the water column, the wind speed of the reactor is between 6 and 10 m/s, and the residence time of the waste gas in the reactor is between 1 second and 3 seconds.

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