High-temperature flue gas treatment system

Abstract

The invention relates to the technical field of flue gas treatment, and provides a high-temperature flue gas treatment system which comprises a kiln, a settling chamber, a dust falling tank, a spray tower and a fan which are sequentially communicated through pipelines, and the dust falling tank is provided with a suction opening communicated with the outside; and the suction opening keeps negative pressure under the action of the fan and is used for extracting smoke escaping from the kiln. According to the system, the risk that smoke and dust carried by the smoke escape to the working environment can be reduced to the maximum extent, and the situation that the smoke and the dust carried by the smoke escape to pollute the working environment is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of flue gas treatment, and specifically to a high-temperature flue gas treatment system. Background Art

[0002] In the fields of chemical industry, petroleum, metallurgy, building materials, and bio-pyrolysis, high-temperature dusty gases are often produced. These dusts suspended in the air will have a serious impact on the health of workers. Therefore, high-temperature flue gas needs to be cooled and dusted in industry. The traditional approach is to use a dust collector to treat flue gas, but the high dust and moisture content in the high-temperature flue gas makes the pipelines and equipment of the traditional dust collector easily blocked, and there is a risk of dust explosion in the closed dust collector.

[0003] CN114956160A discloses a zinc selenide decomposition device and process, the zinc selenide decomposition device comprises a control system and a crusher electrically connected to the control system, a discharge valve, a sedimentation chamber, a rotary calcining kiln, a smoke treatment tower, and a spray tower, the sedimentation chamber, the smoke treatment tower, and the spray tower are connected in sequence by pipelines, the crusher is connected to the feed port of the rotary calcining kiln through the discharge valve, and the exhaust port of the rotary calcining kiln is connected to the air inlet of the sedimentation chamber. The above patent connects the smoke treatment tower and the spray tower in sequence after the sedimentation chamber, and the smoke treatment tower and the spray tower are continuously opened during the entire production process, so as to ensure that the tail gas in the rotary calcining kiln and the sedimentation chamber continuously enters the smoke treatment tower and the spray tower for treatment, thereby preventing the tail gas from overflowing and polluting the workshop environment, and at the same time, continuous ventilation allows the rotary calcining kiln to continuously enter air, and the purpose of rapid cooling and preventing dust explosion is achieved by continuously introducing nitrogen.

[0004] The above patent can prevent exhaust gas from overflowing and polluting the workshop environment. However, during the production process of the kiln, although most of the smoke and the dust it carries will enter the sedimentation chamber for treatment, it is inevitable that some dust will escape from the system through the gaps between the feed port and the discharge port of the kiln and cannot be collected and treated. In addition, the entire device of the above patent is closed, so in order to prevent dust explosions, nitrogen needs to be continuously introduced during its operation to increase the cooling rate and reduce the oxygen content. This method not only increases the production cost, but is also difficult to apply in practice, and requires precise control of the relationship between the amount of nitrogen introduced and the production volume.

[0005] Based on this, the technical problem solved in this case is: how to further solve the problem of dust escaping into the working environment and causing pollution. Summary of the invention

[0006] In order to solve the above technical problems, the present application provides a high-temperature flue gas treatment system, which can minimize the risk of flue gas and the dust it carries escaping into the working environment, and avoid the leakage of flue gas and the dust it carries to pollute the working environment.

[0007] The technical solution of this application is:

[0008] A high-temperature flue gas treatment system comprises a kiln, a sedimentation chamber, a dust reduction tank, a spray tower and a fan which are connected in sequence by pipelines. The dust reduction tank is provided with an exhaust port connected to the outside. The exhaust port maintains negative pressure under the action of the fan and is used to extract the smoke and dust emitted from the kiln.

[0009] When the flue gas passes through the sedimentation chamber, a large amount of flue gas and the dust it carries are cooled to form powder and fall into the sedimentation chamber. After the remaining flue gas is treated in the dust settling tank, only a small amount of pollutants remain. At the same time, under the action of the fan, the fine dust emitted from the kiln is continuously drawn into the dust settling tank through the exhaust port and sent to the spray tower for secondary treatment together with the pollutants, thereby meeting environmental protection emission standards.

[0010] In the above-mentioned high-temperature flue gas treatment system, the dust reduction tank is a water bath dust collector; the sedimentation chamber is connected to the dust reduction tank through an exhaust pipe; the exhaust pipe extends into the dust reduction tank; and the exhaust port is arranged at the top of the dust reduction tank.

[0011] In the above-mentioned high-temperature flue gas treatment system, the high-temperature flue gas treatment system also includes a cooling device for cooling the high-temperature flue gas in the sedimentation chamber; the cooling device includes a water jacket mounted on the sedimentation chamber and a chiller connected to the water jacket.

[0012] In the above-mentioned high-temperature flue gas treatment system, the sedimentation chamber is composed of a plurality of cooling chambers which are connected end to end in sequence; and the chiller is provided with a plurality of circulating water circuits corresponding to the cooling chambers one by one.

[0013] In the above-mentioned high-temperature flue gas treatment system, a partition is provided in the cooling chamber.

[0014] In the above-mentioned high-temperature flue gas treatment system, the capacities of the plurality of cooling chambers are gradually reduced.

[0015] In the above-mentioned high-temperature flue gas treatment system, the kiln and the sedimentation chamber are connected through an air inlet pipe; an insulation sleeve is provided on the outer periphery of the air inlet pipe.

[0016] In the above-mentioned high-temperature flue gas treatment system, the insulation sleeve is provided with a thermocouple and a temperature detection module for maintaining a constant temperature of the air intake pipe.

[0017] In the above-mentioned high-temperature flue gas treatment system, each cooling chamber is provided with a ash cleaning port.

[0018] One of the above technical solutions of the present application has at least one of the following advantages or beneficial effects:

[0019] The flue gas in the system of the present application is first cooled in a sedimentation chamber to recover most of the dust, thereby achieving the effect of reducing losses, and the small amount of dust remaining in the flue gas is first mixed and removed through a dust reduction tank, thereby reducing the processing capacity of the spray tower and improving the exhaust gas treatment efficiency; at the same time, in order to be able to collect and process the flue gas and the dust it carries that escape to the outside, the dust reduction tank forms a certain pressure difference with the outside world under the action of the fan, so that the flue gas and the dust it carries that escape from the kiln can be processed, which can minimize the risk of the flue gas and the dust it carries escaping to the working environment, and avoid the leakage of the flue gas and the dust it carries and polluting the working environment. Finally, the pollutants remaining in the system and the fine dust emitted by the kiln are treated for a second time by the spray tower, so that the exhaust gas of the system meets the environmental emission standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a high-temperature flue gas treatment system according to Example 1 of the present application.

[0021] Description of reference numerals:

[0022] 1. Kiln; 2. Sedimentation chamber; 21. Cooling chamber; 211. Partition; 212. Ash removal port; 3. Cooling device; 31. Water jacket; 32. Chiller; 321. Water inlet pipe; 322. Water return pipe; 4. Dust reduction tank; 41. Exhaust port; 5. Spray tower; 6. Fan; 101. Air inlet pipe; 110. Insulation jacket; 102. Exhaust pipe. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0024] Example 1

[0025] A high-temperature flue gas treatment system comprises a kiln 1, a sedimentation chamber 2, a dust reduction tank 4, a spray tower 5, and a fan 6 which are sequentially connected by pipelines. The dust reduction tank 4 is provided with an exhaust port 41 connected to the outside. The exhaust port 41 maintains negative pressure under the action of the fan 6 and is used to extract the smoke and dust emitted from the kiln 1.

[0026] In actual production, most of the flue gas and the dust carried by the flue gas will enter the sedimentation chamber 2 through the pipeline for dust sedimentation treatment, but a small part of the flue gas and the dust carried by it will escape to the outside through the gaps between the feed port and the discharge port of the kiln 1.

[0027] The flue gas in the system of this embodiment is first cooled in the sedimentation chamber 2 to recover most of the dust, thereby achieving the effect of reducing the loss, and the small amount of dust remaining in the flue gas is first mixed and removed by the dust reduction tank 4, thereby reducing the processing capacity of the spray tower 5 and improving the exhaust gas treatment efficiency; at the same time, in order to collect and process the flue gas and the dust it carries that escape to the outside, the dust reduction tank 4 forms a certain pressure difference with the outside under the action of the fan 6, so that the flue gas and the dust it carries that escape from the kiln 1 can be processed, which can minimize the risk of the flue gas and the dust it carries escaping to the working environment, and avoid the leakage of the flue gas and the dust it carries and polluting the working environment. Finally, the pollutants remaining in the system and the fine dust emitted by the kiln 1 are secondary treated by the spray tower 5, so that the exhaust gas of the system meets the environmental emission standards.

[0028] More preferably, the dust reduction tank 4 is connected with a three-way pipe so that the exhaust port of the dust reduction tank 4 is respectively located on the feed port and the discharge port of the kiln 1, thereby improving the efficiency of extracting the smoke emitted from the kiln 1 and the dust it carries.

[0029] In this embodiment, the dust reduction tank 4 is a water bath dust collector; the sedimentation chamber 2 is connected to the dust reduction tank 4 through an exhaust pipe 102; the exhaust pipe 102 extends into the dust reduction tank 4; and the exhaust port 41 is arranged on the top of the dust reduction tank 4.

[0030] In actual application, the tail gas pipe 102 is placed above the dust removal water and under the action of the fan 6, the flue gas emitted from the kiln 1 and the smoke carried by it can be continuously transported to the spray tower 5.

[0031] It should be noted that, in this embodiment Figure 1 Only the connection relationship between the components of this solution is shown, and it does not represent the spatial relationship between the various components. In actual application, the dust reduction tank 4 should be arranged at the position where the leakage of the kiln 1 and the sedimentation chamber 2 is more serious.

[0032] As a preferred embodiment of this embodiment, the high-temperature flue gas treatment system also includes a cooling device 3 for cooling the high-temperature flue gas in the sedimentation chamber 2; the cooling device 3 includes a water jacket 31 mounted on the sedimentation chamber 2 and a chiller 32 connected to the water jacket 31.

[0033] It should be noted that, in this embodiment, the chiller 32 is a closed cooling tower.

[0034] As a further preference of this embodiment, the sedimentation chamber 2 is composed of four cooling chambers 21 connected end to end in sequence and the capacities of the four cooling chambers 21 gradually decrease; the chiller 32 is provided with four circulating water circuits corresponding to the cooling chambers 21 one by one.

[0035] In this embodiment, in order to facilitate the staff to collect the dust recovered in the sedimentation chamber 2, the cooling chamber 21 is provided with a dust cleaning port 212.

[0036] Under the above-mentioned preference, the water inlet pipe 321 and the water return pipe 322 of the circulating water circuit are both arranged on the water jacket 31, and then the precipitation chamber 2 is indirectly cooled by continuously supplying cold water to the water jacket 31 through the chiller 32, and the multiple circulating water circuits can independently control the temperature of the frozen water, so that the temperature of each cooling chamber 21 can be regulated separately. In actual production, the temperature of each cooling chamber 21 is regulated according to the substances with different boiling points in the flue gas to better realize separation and collection, and the gradual reduction of the capacity of the cooling chamber 21 is a preference made according to the dust processing amount in actual production.

[0037] In practical applications, in order to increase the cooling time of the flue gas in the sedimentation chamber 2 and ensure that the high-temperature exhaust gas is fully cooled and settled, a partition 211 is provided in the cooling chamber 21, thereby lengthening the flow path of the flue gas in the sedimentation chamber 2.

[0038] As a preferred embodiment of the present invention, the kiln 1 is connected to the precipitation chamber 2 via an air inlet pipe 101; an insulation sleeve 110 is disposed on the outer periphery of the air inlet pipe 101. Specifically, in the present embodiment, the insulation sleeve 110 is composed of two semicircular components that are buckled together.

[0039] As a further preferred embodiment of this embodiment, the thermal insulation sleeve 110 is provided with a thermocouple and a temperature detection module for maintaining a constant temperature of the air intake pipe 101 .

[0040] Under the above-mentioned preference, the heating temperature of the insulation sleeve 110 is set according to the temperature of the high-temperature flue gas when it flows into the air intake pipe 101, thereby ensuring the constant temperature inside the air intake pipe 101 and preventing the flue gas from cooling in the air intake pipe 101 and generating dust that settles in the air intake pipe 101 and causes blockage of the air intake pipe 101.

[0041] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A high-temperature flue gas treatment system, comprising a kiln, a sedimentation chamber, a dust reduction tank, a spray tower, and a fan connected in sequence by pipelines, characterized in that: The dust reduction tank is provided with an air exhaust port connected to the outside; the air exhaust port maintains negative pressure under the action of the fan and is used to extract smoke and dust emitted from the kiln.

2. A high temperature flue gas treatment system according to claim 1, characterized in that: The dust reduction tank is a water bath dust collector; the sedimentation chamber is connected to the dust reduction tank through an exhaust pipe; the exhaust pipe extends into the dust reduction tank; and the air exhaust port is arranged on the top of the dust reduction tank.

3. A high temperature flue gas treatment system according to claim 1, characterized in that: The high-temperature flue gas treatment system also includes a cooling device for cooling the high-temperature flue gas in the precipitation chamber; the cooling device includes a water jacket mounted on the precipitation chamber and a chiller connected to the water jacket.

4. A high-temperature flue gas treatment system according to claim 3, characterized in that: The sedimentation chamber is composed of a plurality of cooling chambers which are connected end to end in sequence; the chiller is provided with a plurality of circulating water paths which correspond one to one with the cooling chambers.

5. A high temperature flue gas treatment system according to claim 4, characterized in that: A partition is arranged in the cooling chamber.

6. A high temperature flue gas treatment system according to claim 4, characterized in that: The capacities of the plurality of cooling chambers gradually decrease.

7. A high temperature flue gas treatment system according to claim 1, characterized in that: The kiln is connected to the precipitation chamber through an air inlet pipe; a heat preservation sleeve is arranged on the outer periphery of the air inlet pipe.

8. A high temperature flue gas treatment system according to claim 7, characterized in that: The heat preservation sleeve is provided with a thermocouple and a temperature detection module for maintaining a constant temperature of the air intake pipe.

9. A high temperature flue gas treatment system according to claim 4, characterized in that: The cooling chambers are all provided with ash cleaning ports.

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