Organic waste gas purification system

Abstract

The utility model relates to the technical field of waste gas treatment, and discloses an organic waste gas purification system which comprises an adsorption column, an adsorption device and a rotary heat storage reaction device, an adsorption liquid is arranged in the adsorption column; the adsorption device is provided with a first end and a second end which are oppositely arranged, and an activated carbon filler adsorption layer is arranged between the first end and the second end; the rotary heat storage reaction device comprises a first rotary valve, a second rotary valve, a preheating cavity, a heat exchange cavity and an oxidation cavity, a heater and a temperature sensor are arranged in the preheating cavity, a catalyst is arranged in the oxidation cavity, the heat exchange cavity comprises at least two heat storage chambers, heat storage bodies are arranged in the heat storage chambers, and the preheating cavity is communicated with the heat exchange cavity through the first rotary valve; and the heat exchange cavity is communicated with the oxidation cavity through a second rotary valve. The device can solve the problems of low waste gas purification efficiency when mixed organic waste gas with complex components is treated by single catalytic oxidation, high energy consumption of single external source heating and heat loss in the purification process.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to an organic waste gas purification system. Background Art

[0002] The existing organic waste gas treatment technologies are mainly physical and chemical methods. Physical methods include adsorption, physical absorption, condensation, membrane separation, etc.; chemical methods mainly include combustion, photocatalytic oxidation, low-temperature plasma, etc. Among them, the electric heating catalytic oxidation method is to pre-treat the tail gas to remove dust, and then send it to the heating chamber to make the gas reach the combustion reaction temperature, and then through the action of the catalytic bed, the organic waste gas is decomposed into carbon dioxide and water, and then enters the heat exchanger to exchange heat with the low-temperature gas, so that the temperature of the incoming gas is raised to the reaction temperature. Using the catalyst as an intermediate, the organic gas is converted into harmless water and carbon dioxide gas at a lower temperature.

[0003] However, this technology has the following disadvantages:

[0004] 1. The mixed exhaust gas has complex components and low exhaust purity, which can easily lead to reduced efficiency of catalytic oxidation reaction;

[0005] 2. Single catalytic oxidation technology is difficult to ensure the purification effect of mixed exhaust gas;

[0006] 3. The exhaust gas is arranged separately in the catalytic reaction and heat exchange systems, resulting in high heat loss and low heat recovery efficiency during the exhaust gas circulation process, and a large amount of insulation materials are used;

[0007] 4. The system relies on electric heating system for heating, which has high energy consumption. Utility Model Content

[0008] The purpose of the utility model is to design an organic waste gas purification system which can solve the above problems.

[0009] In order to achieve the above-mentioned purpose, the utility model provides an organic waste gas purification system, including: an adsorption column, an adsorption device and a rotary heat storage reaction device;

[0010] The adsorption column is provided with an adsorption liquid, the middle part of the adsorption column is connected with a liquid inlet pipe for introducing the adsorption liquid, the bottom of the adsorption column is connected with a liquid discharge pipe for discharging the adsorption liquid and a first air inlet pipe for introducing the waste gas to be treated, and the upper part of the adsorption column is connected with a first exhaust pipe for discharging the waste gas;

[0011] The adsorption device has a first end and a second end that are arranged opposite to each other, an activated carbon filler adsorption layer is arranged between the first end and the second end, the first end is connected to the first exhaust pipe, and the second end is connected to the second intake pipe;

[0012] The rotary heat storage reaction device includes a first rotary valve, a second rotary valve, a preheating chamber, a heat exchange chamber and an oxidation chamber. The preheating chamber is connected to the second air intake pipe. A heater and a temperature sensor are provided in the preheating chamber. A catalyst is provided in the oxidation chamber. The heat exchange chamber includes at least two heat storage chambers. Each of the heat storage chambers is provided with a heat storage body. The preheating chamber is connected to the heat exchange chamber through the first rotary valve, and the first rotary valve can control the connection state of each of the heat storage chambers and the preheating chamber; the heat exchange chamber is connected to the oxidation chamber through the second rotary valve, and the second rotary valve can control the connection state of each of the heat storage chambers and the oxidation chamber; the oxidation chamber is connected to a second exhaust pipe for discharging exhaust gas.

[0013] Furthermore, the rotary heat storage reaction device also includes a purge chamber, which is communicated with each of the heat storage chambers respectively and can remove residual exhaust gas in the heat storage chambers.

[0014] Furthermore, the heat exchange chamber includes 10 heat storage chambers and 2 purge chambers.

[0015] Furthermore, the heat exchange chamber has a cylindrical cavity, and a plurality of partitions are provided along the radial direction of the heat exchange chamber to evenly divide the heat exchange chamber into a plurality of the heat storage chambers and the purge chambers.

[0016] Furthermore, the second exhaust pipe is provided with a reflux branch pipe connected to the preheating chamber.

[0017] Furthermore, the exhaust gas temperature in the preheating chamber is 150-200° C., and the exhaust gas intake flow rate is 0.5-1 m / s.

[0018] Furthermore, at least two layers of mesh are provided in the oxidation chamber, and the catalyst is loaded on each of the meshes.

[0019] Furthermore, the activated carbon filler adsorption layer can be detachably mounted on the adsorption device.

[0020] Furthermore, it also includes a shell, the adsorption column, the adsorption device and the rotary heat storage reaction device are arranged in the shell from left to right in sequence, and the preheating chamber, the heat exchange chamber and the oxidation chamber are arranged in sequence from bottom to top.

[0021] Furthermore, the adsorption liquid is composed of 1% of oligomeric surfactant, 0.6% of inorganic salt, 30% of non-polar organic matter, 0.1% of defoaming agent and 68.3% of water.

[0022] Compared with the prior art, the organic waste gas purification system of the utility model has the following beneficial effects:

[0023] The organic waste gas purification system of the embodiment of the utility model can use the absorption liquid to pre-treat and absorb the mixed waste gas by arranging the adsorption column and the adsorption device as the waste gas absorption and purification zone before the reaction device, so as to improve the purity of the waste gas entering the reaction device, and solve the problem of low waste gas purification efficiency when the mixed organic waste gas with complex components is treated by single catalytic oxidation; at the same time, the heat storage body is used to improve the thermal efficiency of the catalytic reaction, and the problem of high energy consumption of single external heating source is solved; a rotary heat storage reaction device is also adopted, which is divided into multiple heat storage chambers. After preheating at the initial start-up, the heating of the heat storage body in different heat storage chambers and the heat recovery cycle are used to solve the heat loss problem of the conventional separate heat exchange system in the circulation process, and the use cost of the insulation material is also reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an organic waste gas purification system according to an embodiment of the utility model;

[0025] Figure 2 It is a structural schematic diagram of a rotary heat storage reaction device in an organic waste gas purification system of an embodiment of the utility model.

[0026] In the figure, 1, adsorption column; 10, adsorption liquid; 11, liquid inlet pipe; 12, liquid discharge pipe; 13, first air inlet pipe; 14, first exhaust pipe; 2, adsorption device; 21, first end; 22, second end; 23, activated carbon filler adsorption layer; 3, rotary heat storage reaction device; 31, second air inlet pipe; 32, second exhaust pipe; 33, first rotary valve; 34, second rotary valve; 35, preheating chamber; 351, heater; 352, temperature sensor; 36, heat exchange chamber; 361, heat storage chamber; 362, purge chamber; 363, heat storage body; 364, partition; 37, oxidation chamber; 371, catalyst; 372, mesh body; 38, reflux branch pipe; 4, shell. DETAILED DESCRIPTION

[0027] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present invention, it should be understood that the terms "connected", "connected", "fixed" and the like used in the present invention should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or a welding connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The present invention uses the terms "first", "second", etc. to describe various information, but these information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information.

[0031] like Figure 1 As shown, an organic waste gas purification system of a preferred embodiment of the utility model includes: an adsorption column 1, an adsorption device 2 and a rotary heat storage reaction device 3; an adsorption liquid 10 is provided in the adsorption column 1, the middle part of the adsorption column 1 is connected with a liquid inlet pipe 11 for introducing the adsorption liquid 10, the bottom of the adsorption column 1 is connected with a liquid discharge pipe 12 for discharging the adsorption liquid 10 and a first air inlet pipe 13 for introducing the waste gas to be treated, and the upper part of the adsorption column 1 is connected with a first exhaust pipe 14 for discharging the waste gas.

[0032] The adsorption device 2 has a first end 21 and a second end 22 that are oppositely disposed. An activated carbon filler adsorption layer 23 is disposed between the first end 21 and the second end 22 . The first end 21 is connected to the first exhaust pipe 14 , and the second end 22 is connected to the second intake pipe 31 .

[0033] The rotary heat storage reaction device 3 includes a first rotary valve 33, a second rotary valve 34, a preheating chamber 35, a heat exchange chamber 36 and an oxidation chamber 37. The preheating chamber 35 is connected to the second air intake pipe 31. A heater 351 and a temperature sensor 352 are arranged in the preheating chamber 35. A catalyst 371 is arranged in the oxidation chamber 37. The heat exchange chamber 36 includes at least two heat storage chambers 361. Each of the heat storage chambers 361 is provided with a heat storage body 363. The preheating chamber 35 is connected to the heat exchange chamber 36 through the first rotary valve 33. The first rotary valve 33 can control the connection state of each of the heat storage chambers 361 and the preheating chamber 35. The heat exchange chamber 36 is connected to the oxidation chamber 37 through the second rotary valve 34. The second rotary valve 34 can control the connection state of each of the heat storage chambers 361 and the oxidation chamber 37. The oxidation chamber 37 is connected to the second exhaust pipe 32 for discharging exhaust gas.

[0034] The absorption column is a quartz glass absorption column, and each pipeline is equipped with a high temperature resistant valve to control its opening and closing. After the mixed exhaust gas enters the purification system, it is first passed into the adsorption liquid 10 through the first intake pipe 13, and then passed into the activated carbon filler adsorption layer 23 through the first exhaust pipe 14. The activated carbon filler adsorption layer 23 can further adsorb pollutants in the mixed exhaust gas, improve the purity of the exhaust gas, and absorb moisture in the exhaust gas to prevent moisture from affecting the efficiency of subsequent catalytic oxidation reactions.

[0035] The exhaust gas purified by the activated carbon filler adsorption layer 23 enters the rotary heat storage reaction device 3. The preheating chamber 35 uses a temperature sensor 352 to monitor the temperature change. When the temperature is lower than the designed reaction temperature, the exhaust gas is preheated by the heater 351 to ensure the subsequent reaction efficiency, wherein the heater 351 can be an electric heater 351.

[0036] The heat storage chamber 361 is divided into an air intake chamber and an exhaust chamber. The air intake chamber is connected to the preheating chamber 35 for introducing the uncatalytically oxidized exhaust gas; the exhaust chamber is not connected to the preheating chamber 35 and is used to introduce the catalytically oxidized exhaust gas. During operation, the exhaust gas first enters the air intake chamber from the preheating chamber 35 through the first rotary valve 33 and is heated to 400°C~450°C by the heat storage body 363 in the air intake chamber, and then enters the oxidation chamber through the second rotary valve 34, fully contacts with the catalyst 371 in the oxidation chamber, and an oxidation reaction occurs under high temperature conditions. After oxidative degradation, the exhaust gas enters the exhaust chamber through the second rotary valve 34 and transfers the heat back to the heat storage body 363 in the exhaust chamber. The cooled exhaust gas is discharged from the system through the second exhaust pipe 32, completing a cycle of purification process. Then the exhaust chamber is converted into the air intake chamber, and the air intake chamber is converted into the exhaust chamber to carry out the next cycle of exhaust gas purification. The system cycles alternately, effectively improving the heat recovery rate, ensuring internal heat circulation, and reducing heat loss.

[0037] Among them, the material of the heat storage body 363 can be ceramic, and the catalyst 371 can be Pt-Pd / γ-Al2O3; in the specific embodiment of the present application, one cycle period is controlled within 50~90s.

[0038] In some improved solutions of the present application, the rotary heat storage reaction device 3 further includes a purge chamber 362 , which is communicated with each of the heat storage chambers 361 , respectively, and can remove residual exhaust gas in the heat storage chambers 361 .

[0039] Specifically, the purge chamber 362 can be connected to each of the heat storage chambers 361 through the first rotary valve 33 or the second rotary valve 34. After the exhaust gas is discharged, the first rotary valve 33 or the second rotary valve 34 controls the connection of the purge chamber 362, and fresh air is introduced to discharge the residual exhaust gas in each heat storage chamber 361, so as to improve the purification process within a cycle and avoid mutual contamination of exhaust gas during the heat exchange process.

[0040] like Figure 2 As shown, in some improved solutions of the present application, the heat exchange chamber 36 includes 10 heat storage chambers 361 and 2 purge chambers 362. Specifically, during operation, 5 heat storage chambers 361 are defined as air intake chambers connected to the preheating chamber 35, and the other 5 heat storage chambers 361 are defined as exhaust chambers not connected to the preheating chamber 35.

[0041] In some improved solutions of the present application, the heat exchange chamber 36 is cylindrical, and a plurality of partitions 364 are provided along the radial direction of the heat exchange chamber 36 to evenly divide the heat exchange chamber 36 into a plurality of heat storage chambers 361 and the purge chamber 362. The connection between the heat storage chamber 361 and the preheating chamber 35 and the oxidation chamber 37 can be controlled by rotation, which has a simple structure and convenient operation; at the same time, the entire catalytic oxidation process is controlled to be carried out in the same container, reducing heat loss and improving heat utilization efficiency.

[0042] In some improved schemes of the present application, a reflux branch pipe 38 connected to the preheating chamber 35 is provided on the second exhaust pipe 32, and a valve is provided on the reflux branch pipe 38. The reflux branch pipe 38 is used to return part of the treated exhaust gas to the preheating chamber 35, thereby realizing heat recovery and improving the exhaust gas purification effect.

[0043] In some improved schemes of the present application, the exhaust gas temperature in the preheating chamber 35 is 150~200°C, and the exhaust gas intake flow rate is 0.5~1m / s, so as to ensure that the heating efficiency of the heater 351 can enable the preheating chamber 35 to reach the temperature required for the reaction, wherein the exhaust gas intake flow rate is the exhaust gas flow rate entering the preheating chamber 35 through the second intake pipe 31.

[0044] In some improved solutions of the present application, at least two layers of mesh 372 are provided in the oxidation chamber 37, and the catalyst 371 is loaded on each of the mesh 372. Specifically, the mesh 372 can be provided with multiple layers and arranged in intervals up and down, so that the catalyst 371 is evenly arranged in the oxidation chamber 37, which helps the catalytic reaction to be more uniform, reduces the temperature required for the catalytic reaction, reduces the overall heat loss, and improves the efficiency of catalytic degradation of exhaust gas.

[0045] In some improved solutions of the present application, the activated carbon filler adsorption layer 23 can be detachably installed on the adsorption device 2, so that it can be easily replaced.

[0046] In some improved solutions of the present application, a shell 4 is further included, wherein the adsorption column 1, the adsorption device 2 and the rotary thermal storage reaction device 3 are sequentially arranged in the shell 4 from left to right, and the preheating chamber 35, the heat exchange chamber 36 and the oxidation chamber 37 are sequentially arranged from bottom to top. The shell 4 is used to form an integrated reactor for the purification system, so that the entire purification process is controlled in the shell 4, reducing heat loss and improving heat utilization efficiency.

[0047] In some improved solutions of the present application, the adsorption liquid 10 is composed of 1% oligomeric surfactant, 0.6% inorganic salt, 30% non-polar organic matter, 0.1% defoaming agent and 68.3% water. Specifically, the inorganic salt can be sodium chloride or potassium chloride, the non-polar organic matter can be dimethylacetamide or propylene glycol, and the concentration of the adsorption liquid 10 can be controlled at 1500-2000 mg / m 3 within the range.

[0048] In summary, the embodiment of the utility model provides an organic waste gas purification system, which has the following advantages:

[0049] 1. By adding an adsorption column 1 in front of the reaction device, the mixed waste gas is treated and absorbed by the new adsorption liquid 10 in the adsorption column 1, and the activated carbon filler adsorption layer 23 is set to reduce the concentration of organic waste gas in the catalytic oxidation stage, so that the waste gas is more thoroughly removed and the removal efficiency is improved.

[0050] 2. The heat exchange chamber 36 in the reaction device is divided into a heat storage chamber 361 by a partition 364, and a rotary valve is used to adopt a sequential batch catalytic reaction process so that the entire catalytic oxidation process is controlled in the same container, thereby reducing heat loss and improving heat utilization efficiency.

[0051] 3. The catalyst 371 is evenly arranged in the oxidation chamber 37 by using a mesh 372 loaded with multiple layers of catalyst 371, so that the exhaust gas is in full and even contact with the catalyst 371 in the oxidation chamber 37, making the catalytic reaction more uniform, reducing the temperature required for the catalytic reaction, reducing heat loss, and improving the catalytic degradation efficiency of the exhaust gas.

[0052] 4. A reflux branch pipe 38 is provided on the second exhaust pipe 32 to reflux part of the exhaust gas, thereby realizing heat recovery and improving the exhaust gas purification effect.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An organic waste gas purification system, characterized in that: include: Adsorption column, adsorption device and rotary thermal storage reaction device; The adsorption column is provided with an adsorption liquid, the middle part of the adsorption column is connected with a liquid inlet pipe for introducing the adsorption liquid, the bottom of the adsorption column is connected with a liquid discharge pipe for discharging the adsorption liquid and a first air inlet pipe for introducing the waste gas to be treated, and the upper part of the adsorption column is connected with a first exhaust pipe for discharging the waste gas; The adsorption device has a first end and a second end that are arranged opposite to each other, an activated carbon filler adsorption layer is arranged between the first end and the second end, the first end is connected to the first exhaust pipe, and the second end is connected to the second intake pipe; The rotary heat storage reaction device includes a first rotary valve, a second rotary valve, a preheating chamber, a heat exchange chamber and an oxidation chamber. The preheating chamber is connected to the second air intake pipe. A heater and a temperature sensor are provided in the preheating chamber. A catalyst is provided in the oxidation chamber. The heat exchange chamber includes at least two heat storage chambers. Each of the heat storage chambers is provided with a heat storage body. The preheating chamber is connected to the heat exchange chamber through the first rotary valve, and the first rotary valve can control the connection state of each of the heat storage chambers and the preheating chamber; the heat exchange chamber is connected to the oxidation chamber through the second rotary valve, and the second rotary valve can control the connection state of each of the heat storage chambers and the oxidation chamber; the oxidation chamber is connected to a second exhaust pipe for discharging exhaust gas.

2. The organic waste gas purification system according to claim 1, characterized in that: The rotary heat storage reaction device also includes a purge chamber, which is communicated with each of the heat storage chambers and can remove residual exhaust gas in the heat storage chambers.

3. The organic waste gas purification system according to claim 2, characterized in that: The heat exchange chamber includes 10 heat storage chambers and 2 purge chambers.

4. The organic waste gas purification system according to claim 2, characterized in that: The heat exchange chamber has a cylindrical body, and a plurality of partitions are arranged along the radial direction of the heat exchange chamber to evenly divide the heat exchange chamber into a plurality of heat storage chambers and the purge chambers.

5. The organic waste gas purification system according to claim 1, characterized in that: The second exhaust pipe is provided with a reflux branch pipe which is in communication with the preheating chamber.

6. The organic waste gas purification system according to claim 1, characterized in that: The exhaust gas temperature in the preheating chamber is 150-200°C, and the exhaust gas intake flow rate is 0.5-1m / s.

7. The organic waste gas purification system according to claim 1, characterized in that: At least two layers of mesh bodies are arranged in the oxidation chamber, and the catalyst is loaded on each of the mesh bodies.

8. The organic waste gas purification system according to claim 1, characterized in that: The activated carbon filler adsorption layer can be detachably mounted on the adsorption device.

9. The organic waste gas purification system according to claim 1, characterized in that: It also includes a shell, the adsorption column, the adsorption device and the rotary heat storage reaction device are arranged in the shell from left to right in sequence, and the preheating chamber, the heat exchange chamber and the oxidation chamber are arranged in sequence from bottom to top.

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