Usage method of a waste heat recovery and utilization type RTO waste gas treatment device

Abstract

The invention discloses a usage method of a waste heat recovery and utilization type RTO waste gas treatment device, which includes a combustion chamber, a regenerative chamber, the regenerative chamber includes a first regenerative chamber and a second regenerative chamber, and a purging and replacement chamber; the usage method is as follows: S1: The first round of catalytic heating, the waste gas enters from the first regenerative chamber, the clean gas is discharged from the second regenerative chamber, and the heat is released to the second regenerative chamber; S2: The first round of purging, purging the pipeline of the first regenerative chamber; S3: The second round of catalytic heating, the waste gas enters from the second regenerative chamber, the clean gas is discharged from the first regenerative chamber, and the heat is released to the first regenerative chamber; S4: The second round of purging, purging the pipeline of the second regenerative chamber; S5: The third round of catalytic heating, the waste gas enters from the first regenerative chamber, the clean gas is discharged from the second regenerative chamber, and the heat is released to the second regenerative chamber; S6: Repeat S2-S5. The invention realizes the recovery and utilization of waste heat and avoids the leakage problem of the untreated tail gas staying in the ceramic being directly discharged from the system.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and particularly relates to a use method of a waste heat recovery and utilization type RTO waste gas treatment device. Background Art

[0002] The waste gas from the workshop coating production line mainly contains ethyl acetate, butyl acetate, isopropyl alcohol, n-butanol, and ethylene glycol monobutyl ether.

[0003] As an efficient organic waste gas treatment device, RTO is widely used in waste treatment. However, most general RTO devices have a large amount of heat waste, and at the same time, they cannot treat the residual organic waste gas in the pipeline, resulting in the untreated tail gas remaining in the ceramic being directly discharged from the system, and the removal efficiency of organic substances is not high. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems that most existing RTO devices have a large amount of heat waste, and at the same time, they cannot treat the residual organic waste gas in the pipeline, resulting in the untreated tail gas remaining in the ceramic being directly discharged from the system, and the removal efficiency of organic substances is not high. Therefore, a use method of a waste heat recovery and utilization type RTO waste gas treatment device is provided.

[0005] The technical solution of the present invention is as follows:

[0006] A method for using a waste heat recovery type RTO waste gas treatment device, including a waste heat recovery type RTO waste gas treatment device. The waste heat recovery type RTO waste gas treatment device includes a combustion chamber. A burner is fixed above the combustion chamber. A gas inlet pipeline is provided on the burner. A regenerator is provided at the lower end of the combustion chamber. The regenerator includes a first regenerator and a second regenerator. The upper parts of the first regenerator and the second regenerator are connected to the combustion chamber through a pipeline with a solenoid valve. A first waste gas inlet pipeline with a first inlet valve and a first clean gas discharge pipeline are provided below the first regenerator. A second waste gas inlet pipeline with a second inlet valve and a second clean gas discharge pipeline are provided below the second regenerator. Both the first waste gas inlet pipeline and the second waste gas inlet pipeline are connected to an RTO main fan. A purging and replacement chamber is provided on one side of the second regenerator. Both the first clean gas discharge pipeline and the second clean gas discharge pipeline are connected to the purging and replacement chamber. An exhaust pipeline with a solenoid valve is provided above the purging and replacement chamber. A cleaning blower is provided in the purging and replacement chamber. The cleaning blower is connected to a first cleaning pipeline and a second cleaning pipeline with control valves. The first clean gas discharge pipeline is connected to the first cleaning pipeline, and a first exhaust valve is provided on the side away from the first regenerator at the connection with the second cleaning pipeline. The second clean gas discharge pipeline is connected to the second cleaning pipeline, and a second exhaust valve is provided on the side away from the second regenerator at the connection with the second cleaning pipeline. Ceramic filter plates are provided in both the first regenerator and the second regenerator;

[0007] The method for using the waste heat recovery type RTO waste gas treatment device includes the following steps:

[0008] S1: The first round of catalytic heating. Open the first inlet valve, the second exhaust valve and the solenoid valve, and close the other valves. The organic waste gas first enters from the first regenerator. Through the heat supplemented by the burner, the temperature of the organic waste gas is raised to about 800 °C. Under the action of 3T (temperature, residence time, turbulence), the components of the organic waste gas are decomposed into CO2 and H2O. The clean gas after sufficient oxidation is discharged from the second regenerator into the purging and replacement chamber and discharged through the gas discharge pipeline, and the heat is released to the ceramic filter plate in the second regenerator;

[0009] S2: The first round of purging. Open the control valve of the first cleaning pipeline, the first inlet valve, and close the other valves. Purge the pipeline of the first regenerator to blow the remaining organic waste gas in the pipeline to the RTO main fan;

[0010] S3: Second-round catalytic heating. Open the second intake valve, the first exhaust valve, and the solenoid valve, and close the remaining valves. The organic waste gas enters from the second regenerative chamber, absorbs the heat of the ceramic filter plate in the second regenerative chamber, and then with the heat supplemented by the burner, the temperature of the organic waste gas is increased to about 800 °C. Under the action of 3T (temperature, residence time, turbulence), the components of the organic waste gas are decomposed into CO2 and H2O. The clean gas then discharges from the first regenerative chamber into the purge replacement chamber and is discharged through the gas discharge pipe, and releases heat to the ceramic filter plate in the first regenerative chamber;

[0011] S4: Second-round purge. Open the control valve of the second purge pipe, the second intake valve, and close the remaining valves to purge the pipes in the second regenerative chamber and blow the remaining organic waste gas in the pipes to the RTO main fan;

[0012] S5: Third-round catalytic heating. Open the first intake valve, the second exhaust valve, and the solenoid valve, and close the remaining valves. The organic waste gas enters from the first regenerative chamber, absorbs the heat of the ceramic filter plate in the first regenerative chamber, and then with the heat supplemented by the burner, the temperature of the organic waste gas is increased to about 800 °C. Under the action of 3T (temperature, residence time, turbulence), the components of the organic waste gas are decomposed into CO2 and H2O; The clean gas after sufficient oxidation discharges from the second regenerative chamber into the purge replacement chamber and is discharged through the gas discharge pipe, and releases heat to the ceramic filter plate in the second regenerative chamber;

[0013] S6: Repeat steps S2 - S5 until the waste gas treatment operation is completed.

[0014] In the above solution, a ceramic saddles layer is provided at the bottom of the ceramic filter plate, ultrasonic vibration plates are provided on both sides of the ceramic filter plate, the ultrasonic vibration plates are fixed on the inner walls on both sides of the regenerative chamber, and a residue collection tank is connected to the lower side of the ceramic saddles layer.

[0015] In the above solution, the vibration frequency of the ultrasonic vibration plate is 30KHZ.

[0016] In the above solution, the ceramic filter plate is of a multi-layer structure and adopts a layered design.

[0017] In the above solution, the ceramic filter plate adopts plate-type honeycomb ceramics.

[0018] In summary, the beneficial effects of the present invention are:

[0019] The present invention adopts a three-chamber structure. When in use, the first intake valve, the second exhaust valve and the solenoid valve are opened, and the remaining valves are closed. The organic waste gas first enters from the first regenerative chamber, absorbs the heat of the regenerator and the heat supplemented by the burner, and the temperature of the organic waste gas is increased to about 800 °C. Under the action of 3T (temperature, residence time, turbulence), the components of the organic waste gas are decomposed into CO2 and H2O; the clean gas after sufficient oxidation is discharged from the second regenerative chamber into the purge replacement chamber and discharged through the gas discharge pipe, and the heat is released to the regenerator of the second regenerative chamber, and the heat is recovered. Then, the circulation route is changed. The second intake valve, the first exhaust valve and the solenoid valve are opened, and the remaining valves are closed. The organic waste gas then enters from the second regenerative chamber to repeat the above decomposition process. The clean gas is then discharged from the first regenerative chamber into the purge replacement chamber and discharged through the gas discharge pipe, and then the above process is repeated; at the same time, a purge operation is added between changing the circulation routes. When changing for an odd number of times, the control valve of the first purge pipe, the first intake valve are opened, and the remaining valves are closed, and the pipes of the first regenerative chamber are purged to blow the remaining organic waste gas in the pipes to the RTO main fan. When changing for an even number of times, the control valve of the second purge pipe, the second intake valve are opened, and the remaining valves are closed, and the pipes of the second regenerative chamber are purged to blow the remaining organic waste gas in the pipes to the RTO main fan. In this way, the recovery and utilization of waste heat are realized, and at the same time, the leakage problem of the untreated tail gas staying in the ceramics and directly discharging from the system when the gas flow direction is periodically switched is avoided. The removal efficiency of organic matter is higher, and the removal efficiency reaches 99%. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be described by way of examples with reference to the accompanying drawings, wherein:

[0021] Figure 1 is a schematic structural diagram of the present invention;

[0022] The names of the components corresponding to the reference numerals in the drawings are as follows: 1 - combustion chamber, 2 - first regenerative chamber, 3 - second regenerative chamber, 4 - purge replacement chamber, 5 - RTO main fan, 6 - ceramic filter plate, 7 - ceramic saddles layer, 8 - ultrasonic vibration plate, 9 - residue collection tank, 11 - burner, 12 - gas inlet pipe, 21 - first waste gas inlet pipe, 22 - first clean gas discharge pipe, 31 - second waste gas inlet pipe, 32 - second clean gas discharge pipe, 41 - first purge pipe, 42 - second purge pipe, 43 - purge blower, 44 - exhaust pipe, 45 - control valve, 211 - first intake valve, 221 - first exhaust valve, 311 - second intake valve, 321 - second exhaust valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To better implement the present invention, the present invention will be further described in detail below with reference to specific embodiments, but the implementation manners of the present invention are not limited thereto.

[0024] Example 1

[0025] As Figure 1 shown, a method for using a waste heat recovery and utilization type RTO waste gas treatment device, which includes a waste heat recovery and utilization type RTO waste gas treatment device. The waste heat recovery and utilization type RTO waste gas treatment device includes a combustion chamber 1. A burner 11 is fixed above the combustion chamber 1, and a gas inlet pipeline 12 is provided on the burner 11. It is characterized in that: a heat storage chamber is provided at the lower end of the combustion chamber 1. The heat storage chamber includes a first heat storage chamber 2 and a second heat storage chamber 3. The upper parts of the first heat storage chamber 2 and the second heat storage chamber 3 are connected to the combustion chamber 1 through a pipeline with a solenoid valve. A first waste gas inlet pipeline 21 with a first inlet valve 211 and a first clean gas discharge pipeline 22 are provided below the first heat storage chamber 2. A second waste gas inlet pipeline 31 with a second inlet valve 311 and a second clean gas discharge pipeline 32 are provided below the second heat storage chamber 3. Both the first waste gas inlet pipeline 21 and the second waste gas inlet pipeline 31 are connected to an RTO main fan 5. A purging and replacement chamber 4 is provided on one side of the second heat storage chamber 3. Both the first clean gas discharge pipeline 22 and the second clean gas discharge pipeline 32 are connected to the purging and replacement chamber 4. An exhaust pipeline 44 with a solenoid valve is provided above the purging and replacement chamber 4. A cleaning blower 43 is provided in the purging and replacement chamber 4. The cleaning blower 41 is connected to a first cleaning pipeline 41 and a second cleaning pipeline 42 with a control valve 45. The first clean gas discharge pipeline 22 is connected to the first cleaning pipeline 41, and a first exhaust valve 221 is provided on the side away from the first heat storage chamber 2 at the connection with the second cleaning pipeline 41. The second clean gas discharge pipeline 32 is connected to the second cleaning pipeline 42, and a second exhaust valve 321 is provided on the side away from the second heat storage chamber 3 at the connection with the second cleaning pipeline 42. Ceramic filter plates 6 are provided in both the first heat storage chamber 2 and the second heat storage chamber 3;

[0026] The method for using the waste heat recovery and utilization type RTO waste gas treatment device includes the following steps:

[0027] S1: The first round of catalytic heating. Open the first inlet valve, the second exhaust valve and the solenoid valve, and close the other valves. The organic waste gas first enters from the first heat storage chamber. Through the heat supplemented by the burner, the temperature of the organic waste gas is raised to about 800 °C. Under the action of 3T (temperature, residence time, turbulence), the components of the organic waste gas are decomposed into CO2 and H2O; the clean gas after sufficient oxidation is discharged from the second heat storage chamber into the purging and replacement chamber and discharged through the gas discharge pipeline, and the heat is released to the ceramic filter plate in the second heat storage chamber;

[0028] S2: The first round of purging. Open the control valve of the first cleaning pipeline, the first inlet valve, and close the other valves. Purge the pipeline of the first heat storage chamber to blow the remaining organic waste gas in the pipeline to the RTO main fan;

[0029] S3: The second round of catalytic heating. Open the second intake valve, the first exhaust valve, and the solenoid valve, and close the remaining valves. The organic waste gas enters from the second regenerative chamber, absorbs the heat of the ceramic filter plate in the second regenerative chamber, and then with the heat supplemented by the burner, the temperature of the organic waste gas is raised to about 800 °C. Under the action of 3T (temperature, residence time, turbulence), the components of the organic waste gas are decomposed into CO2 and H2O. The clean gas then discharges from the first regenerative chamber into the purge replacement chamber and is discharged through the gas discharge pipe, and releases the heat to the ceramic filter plate in the first regenerative chamber;

[0030] S4: The second round of purging. Open the control valve of the second purge pipe, the second intake valve, and close the remaining valves to purge the pipes in the second regenerative chamber and blow the remaining organic waste gas in the pipes to the RTO main fan;

[0031] S5: The third round of catalytic heating. Open the first intake valve, the second exhaust valve, and the solenoid valve, and close the remaining valves. The organic waste gas enters from the first regenerative chamber, absorbs the heat of the ceramic filter plate in the first regenerative chamber, and then with the heat supplemented by the burner, the temperature of the organic waste gas is raised to about 800 °C. Under the action of 3T (temperature, residence time, turbulence), the components of the organic waste gas are decomposed into CO2 and H2O; The clean gas after sufficient oxidation discharges from the second regenerative chamber into the purge replacement chamber and is discharged through the gas discharge pipe, and releases the heat to the ceramic filter plate in the second regenerative chamber;

[0032] S6: Repeat steps S2 - S5 until the waste gas treatment operation is completed.

[0033] Example 2

[0034] Based on Example 1, a ceramic saddles layer 7 is provided at the bottom of the ceramic filter plate 6, and ultrasonic vibration plates 8 are provided on both sides of the ceramic filter plate 6. The ultrasonic vibration plates 8 are fixed on the inner walls on both sides of the first regenerative chamber 2 and the second regenerative chamber 3, and the lower side of the ceramic saddles layer 7 is connected to a residue collection tank 9.

[0035] Example 3

[0036] Based on Example 1 or 2, the vibration frequency of the ultrasonic vibration plate 8 is 30KHZ.

[0037] Example 4

[0038] Based on the above examples, the ceramic filter plate 6 is of a multi-layer structure and adopts a layered design.

[0039] Example 5

[0040] Based on the above examples, the ceramic filter plate 6 adopts plate-type honeycomb ceramics.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for using a waste heat recovery and utilization type RTO waste gas treatment device, characterized in that: It includes a waste heat recovery and utilization type RTO waste gas treatment device, and the waste heat recovery and utilization type RTO waste gas treatment device includes a combustion chamber (1). A burner (11) is fixed above the combustion chamber (1). A gas inlet pipeline (12) is provided on the burner (11). A regenerator is provided at the lower end of the combustion chamber (1). The regenerator includes a first regenerator (2) and a second regenerator (3). The upper parts of the first regenerator (2) and the second regenerator (3) are connected to the combustion chamber (1) through a pipeline with a solenoid valve. A first waste gas inlet pipeline (21) with a first inlet valve (211) and a first clean gas discharge pipeline (22) are provided below the first regenerator (2). A second waste gas inlet pipeline (31) with a second inlet valve (311) and a second clean gas discharge pipeline (32) are provided below the second regenerator (3). Both the first waste gas inlet pipeline (21) and the second waste gas inlet pipeline (31) are connected to an RTO main fan (5). A purge and replacement chamber (4) is provided on one side of the second regenerator (3). Both the first clean gas discharge pipeline (22) and the second clean gas discharge pipeline (32) are communicated with the purge and replacement chamber (4). An exhaust pipeline (44) with a solenoid valve is provided above the purge and replacement chamber (4). A cleaning blower (43) is provided in the purge and replacement chamber (4). The cleaning blower (41) is connected to a first cleaning pipeline (41) and a second cleaning pipeline (42) with a control valve (45). The first clean gas discharge pipeline (22) is connected to the first cleaning pipeline (41), and a first exhaust valve (221) is provided on the side far from the first regenerator (2) at the connection with the second cleaning pipeline (41). The second clean gas discharge pipeline (32) is connected to the second cleaning pipeline (42), and a second exhaust valve (321) is provided on the side far from the second regenerator (3) at the connection with the second cleaning pipeline (42). Ceramic filter plates (6) are provided in both the first regenerator (2) and the second regenerator (3); The method for using this waste heat recovery and utilization type RTO waste gas treatment device includes the following steps: S1: The first round of catalytic heating. Open the first inlet valve, the second exhaust valve and the solenoid valve, and close the other valves. The organic waste gas first enters from the first regenerator. Through the heat supplemented by the burner, the temperature of the organic waste gas is raised to about 800 °C. Under the action of temperature, residence time and turbulence, the components of the organic waste gas are decomposed into CO2 and H2O. The clean gas after sufficient oxidation is discharged from the second regenerator into the purge and replacement chamber and discharged through the gas discharge pipeline, and the heat is released to the ceramic filter plate in the second regenerator; S2: The first round of purging. Open the control valve of the first cleaning pipeline, the first inlet valve, and close the other valves. Purge the pipeline of the first regenerator to blow the remaining organic waste gas in the pipeline to the RTO main fan; S3: Second-round catalytic heating. Open the second intake valve, the first exhaust valve, and the solenoid valve, and close the remaining valves. The organic waste gas enters from the second regenerative chamber, absorbs the heat of the ceramic filter plate in the second regenerative chamber, and then with the heat supplemented by the burner, the temperature of the organic waste gas is raised to about 800 °C. Under the action of temperature, residence time, and turbulence, the components of the organic waste gas are decomposed into CO2 and H2O. The clean gas then discharges from the first regenerative chamber into the purge replacement chamber and is discharged through the gas discharge pipe, and releases the heat to the ceramic filter plate in the first regenerative chamber; S4: Second-round purge. Open the control valve of the second purge pipe, the second intake valve, and close the remaining valves to purge the pipes in the second regenerative chamber to blow the remaining organic waste gas in the pipes to the RTO main fan; S5: Third-round catalytic heating. Open the first intake valve, the second exhaust valve, and the solenoid valve, and close the remaining valves. The organic waste gas enters from the first regenerative chamber, absorbs the heat of the ceramic filter plate in the first regenerative chamber, and then with the heat supplemented by the burner, the temperature of the organic waste gas is raised to about 800 °C. Under the action of temperature, residence time, and turbulence, the components of the organic waste gas are decomposed into CO2 and H2O; The clean gas after sufficient oxidation discharges from the second regenerative chamber into the purge replacement chamber and is discharged through the gas discharge pipe, and releases the heat to the ceramic filter plate in the second regenerative chamber; S6: Repeat steps S2 - S5 until the waste gas treatment operation is completed.

2. The usage method of a waste heat recovery and utilization type RTO waste gas treatment device according to claim 1, characterized in that: A ceramic saddle ring layer (7) is provided at the bottom of the ceramic filter plate (6), and ultrasonic vibration plates (8) are provided on both sides of the ceramic filter plate (6). The ultrasonic vibration plates (8) are fixed on the inner walls on both sides of the first regenerative chamber (2) and the second regenerative chamber (3). The lower side of the ceramic saddle ring layer (7) is connected to a residue collection tank (9).

3. The usage method of a waste heat recovery and utilization type RTO waste gas treatment device according to claim 1, characterized in that: According to the integrated RTO device for anti-blocking as claimed in claim 1, wherein the vibration frequency of the ultrasonic vibration plate (8) is 30KHZ.

4. The usage method of a waste heat recovery and utilization type RTO waste gas treatment device according to claim 1, characterized in that: The ceramic filter plate (6) is of a multi-layer structure and adopts a layered design.

5. The usage method of a waste heat recovery and utilization type RTO waste gas treatment device according to claim 1, characterized in that: The ceramic filter plate (6) adopts plate-type honeycomb ceramics.

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