A high-efficiency energy-saving combined catalytic combustion treatment device for rotating wheels

Abstract

The application relates to a high-efficiency energy-saving rotating wheel combined catalytic combustion treatment device, in particular to the technical field of organic waste gas treatment equipment. The application comprises a washing tower, a demisting filter, a temperature and humidity increasing device, a zeolite rotating wheel, an exhaust chimney, a first fire barrier, a catalytic combustion bed, a primary heat exchanger, a secondary heat exchanger and a second fire barrier. High-temperature tail gas after catalytic combustion is recycled in the form of multi-stage heat exchange, the tail gas is led back to the front end of adsorption, and after pretreatment, the tail gas is discharged after adsorption and purification by the zeolite rotating wheel, so that the purification efficiency of the system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of organic waste gas treatment equipment, in particular to a high-efficiency and energy-saving rotary wheel combined catalytic combustion treatment device. BACKGROUND

[0002] With the increasingly stringent environmental protection requirements, the state's emission limit value requirements for air pollution are becoming higher and higher, causing the organic waste gas treatment process to be continuously upgraded. In recent years, the zeolite rotary wheel / zeolite rotary drum has become the mainstream technology for large-volume and low-concentration organic waste gas treatment due to its high purification efficiency, small footprint, high safety and other advantages.

[0003] In recent years, the rotary wheel adsorption concentration combined catalytic oxidation process has been favored by the majority of users due to its small footprint and low investment cost. However, due to the influence of the catalyst, the purification efficiency of the catalytic combustion process is generally not high, causing the tail gas concentration after catalytic combustion to be unable to meet the emission standard. The existing technology generally adopts a method of mixing and discharging the tail gas after catalytic combustion with the large-volume and low-concentration tail gas discharged by the rotary wheel adsorption, which may cause the tail gas to be discharged beyond the standard. In addition, since the catalytic combustion bed is different from the regenerative high-temperature combustion process (RTO) and the regenerative catalytic oxidation process (RCO) in that it does not have built-in heat accumulators to directly reuse heat, its operating cost is relatively high. Therefore, how to reduce the operating cost of the rotary wheel combined catalytic oxidation waste gas treatment system and improve its purification efficiency has been the research direction of many environmental protection workers. SUMMARY

[0004] (1) Technical problem to be solved

[0005] The present application provides a high-efficiency and energy-saving rotary wheel combined catalytic combustion treatment device, which not only overcomes the problem of tail gas discharge beyond the standard caused by the method of mixing and discharging the tail gas after catalytic combustion with the large-volume and low-concentration tail gas discharged by the rotary wheel adsorption, but also overcomes the disadvantage of high operating cost of the rotary wheel combined catalytic combustion treatment device.

[0006] (2) Technical scheme

[0007] In order to solve the above technical problems, the present application provides a high-efficiency and energy-saving rotary wheel combined catalytic combustion treatment device, which comprises a scrubbing tower, a demisting filter, a temperature and humidity regulator, a zeolite rotary wheel, a discharge chimney, a first fire barrier, a catalytic combustion bed, a primary heat exchanger, a secondary heat exchanger, and a second fire barrier. The inlet of the scrubbing tower is connected with a waste gas inlet pipe. The outlet of the scrubbing tower is connected with the inlet of the demisting filter through a pipeline. The outlet of the demisting filter is connected with the inlet of the temperature and humidity regulator through a pipeline. The zeolite rotary wheel is divided into an adsorption zone, a cooling zone, and a desorption zone. The outlet of the temperature and humidity regulator is connected with the inlet of the adsorption zone through a first pipeline. The outlet of the adsorption zone is connected with the discharge chimney through a pipeline.

[0008] The first pipeline is connected with the cooling zone inlet through a second pipeline, the cooling zone outlet is connected with the primary heat exchanger inlet through a pipeline, the primary heat exchanger outlet is connected with the desorption zone inlet through a pipeline, the desorption zone outlet is connected with the secondary heat exchanger inlet through a pipeline, the secondary heat exchanger outlet is connected with the first fire arrester inlet through a pipeline, the first fire arrester outlet is connected with the catalytic combustion bed inlet through a pipeline, the catalytic combustion bed outlet is connected with one end of the primary heat exchanger through a pipeline, the other end of the primary heat exchanger is connected with one end of the secondary heat exchanger through a pipeline, the other end of the secondary heat exchanger is connected with the second fire arrester inlet, the second fire arrester outlet is connected with one end of the third pipeline, the third pipeline is connected with the temperature and humidity regulator through a fourth pipeline, and the other end of the third pipeline is connected with the exhaust gas inlet pipe through a fifth pipeline.

[0009] Preferably, an adsorption fan is arranged on the connecting pipeline between the adsorption zone outlet and the exhaust chimney.

[0010] Preferably, a desorption fan is arranged on the connecting pipeline between the desorption zone outlet and the secondary heat exchanger inlet.

[0011] Preferably, an analog quantity regulating valve is arranged on the fourth pipeline.

[0012] (3) Beneficial effects

[0013] The present application provides a high-efficiency energy-saving rotary combined catalytic combustion treatment device, which not only overcomes the problem of tail gas exceeding the standard caused by the mixing and discharging of tail gas after catalytic combustion and large wind volume and low concentration tail gas discharged by the rotary adsorption in the prior art, but also overcomes the disadvantage of high operation cost of the rotary combined catalytic combustion treatment device. The present application aims at these problems, realizes heat energy reuse through multi-stage heat exchange for high-temperature tail gas after catalytic combustion, and introduces the tail gas back to the front end of adsorption, and discharges after purification by zeolite rotary adsorption after pretreatment, thereby improving the purification efficiency of the system. Compared with the prior art, the present application has the following beneficial effects:

[0014] 1. The high-temperature tail gas discharged by the catalytic combustion bed is fully utilized, heat is reused through multi-stage heat exchange, and the operation cost is greatly reduced.

[0015] 2. The exhaust gas of the catalytic combustion bed is introduced back to the front end of adsorption, mixed with the front end exhaust gas, and discharged after rotary adsorption, thereby ensuring the purification effect of the system and realizing continuous standard discharge. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The figure is a structural schematic diagram of the present application.

[0017] The attached diagram is labeled as follows: 1-Scrubber, 2-Demisting filter, 3-Heating and humidifying device, 4-Zeolite rotor, 41-Adsorption zone, 42-Cooling zone, 43-Desorption zone, 5-Adsorption fan, 6-Emission chimney, 7-Desorption fan, 8-First flame arrester, 9-Catalytic combustion bed, 10-First stage heat exchanger, 11-Second stage heat exchanger, 12-Second stage flame arrester, 13-Analog quantity regulating valve, 14-First pipeline, 15-Second pipeline, 16-Third pipeline, 17-Fourth pipeline, 18-Fifth pipeline. Detailed Implementation

[0018] The present invention will be further described in conjunction with the accompanying drawings and embodiments.

[0019] like Figure 1 As shown, the present invention discloses a high-efficiency and energy-saving rotary combined catalytic combustion treatment device, comprising a scrubbing tower 1, a demisting filter 2, a temperature and humidity regulator 3, a zeolite rotor 4, an exhaust chimney 6, a first flame arrester 8, a catalytic combustion bed 9, a primary heat exchanger 10, a secondary heat exchanger 11, and a second flame arrester 12. The inlet of the scrubbing tower 1 is connected to the exhaust gas inlet pipe, and the outlet of the scrubbing tower 1 is connected to the inlet of the demisting filter 2 through a pipe. The outlet of the demisting filter 2 is connected to the inlet of the temperature and humidity regulator 3 through a pipe. The zeolite rotor 4 is divided into an adsorption zone 41, a cooling zone 42, and a desorption zone 43. The outlet of the temperature and humidity regulator 3 is connected to the inlet of the adsorption zone 41 through a first pipe 14, and the outlet of the adsorption zone 41 is connected to the exhaust chimney 6 through a pipe.

[0020] The first pipe 14 is connected to the inlet of the cooling zone 42 via the second pipe 15. The outlet of the cooling zone 42 is connected to the inlet of the first-stage heat exchanger 10 via a pipe. The outlet of the first-stage heat exchanger 10 is connected to the inlet of the desorption zone 43 via a pipe. The outlet of the desorption zone 43 is connected to the inlet of the second-stage heat exchanger 11 via a pipe. The outlet of the second-stage heat exchanger 11 is connected to the inlet of the first flame arrester 8 via a pipe. The outlet of the first flame arrester 8 is connected to the inlet of the catalytic combustion bed 9 via a pipe. The outlet of the catalytic combustion bed 9 is connected to one end of the first-stage heat exchanger 10 via a pipe. The other end of the first-stage heat exchanger 10 is connected to one end of the second-stage heat exchanger 11 via a pipe. The other end of the second-stage heat exchanger 11 is connected to the inlet of the second flame arrester 12. The outlet of the second flame arrester 12 is connected to one end of the third pipe 16. The third pipe 16 is connected to the temperature and humidity regulator 3 via the fourth pipe 17. The other end of the third pipe 16 is connected to the exhaust gas inlet pipe via the fifth pipe 18.

[0021] The connecting pipe between the outlet of the adsorption area 41 and the exhaust chimney 6 is provided with an adsorption fan 5, the connecting pipe between the outlet of the desorption area 43 and the inlet of the secondary heat exchanger 11 is provided with a desorption fan 7, and the fourth pipe 17 is provided with an analog quantity regulating valve 13.

[0022] The washing tower 1 belongs to a front-end pretreatment system. It is mainly used for removing large-particle suspended matters, particulate impurities and acid and alkaline gases in waste gas;

[0023] The dehumidification filter 2 aims to remove liquid droplets taken out from the washing tower and intercept fine particles in waste gas, so as to protect the service life and purification efficiency of a zeolite rotary in a rear-end system;

[0024] The temperature and humidity regulator 3 controls the relative humidity of waste gas by adjusting the temperature of waste gas, improves the adsorption performance of a zeolite rotary, and improves the purification efficiency;

[0025] The primary heat exchanger 10 / secondary heat exchanger 11 realizes the cyclic utilization of heat energy of the system, and reduces the operation cost;

[0026] The catalytic combustion bed 9 catalytically oxidizes and decomposes medium-high-concentration waste gas after being concentrated by a rotary, to produce carbon dioxide and water;

[0027] The process route is composed of a purification system and a treatment system;

[0028] The purification system adopts zeolite rotary to process. The waste gas to be treated enters the scrubber 1 first by the traction of the adsorption fan 5, removes the large particle dust and acid and alkali gas in the waste gas through the scrubber 1, enters the rear mist filter 2, removes the liquid droplets and fine dust in the waste gas through the mist filter 2, and removes the liquid droplets and fine dust in the waste gas from the scrubber 1. The waste gas discharged from the scrubber is intercepted by two-stage mist removal layer, and the relative humidity is still high, which greatly affects the purification efficiency of the zeolite rotary, so the relative humidity of the waste gas entering the zeolite rotary 4 needs to be strictly controlled below 80%RH, and the temperature of the gas is increased to be the most effective way to reduce the humidity. The high-temperature tail gas discharged from the catalytic combustion bed 9 is used as the heat source of the temperature and humidity regulator 3, and the temperature before and after the temperature and humidity regulator 3 is controlled by the interlocking of the temperature sensor and the analog quantity adjusting valve 13, so that the temperature of the waste gas is increased by 3-5℃, thereby achieving the purpose of humidity adjustment. The waste gas treated by dust removal and humidity removal is introduced into the zeolite rotary 4 by the adsorption fan. The rotary can rotate at a speed of 1-6 revolutions / hour according to the waste gas treatment capacity. The VOCs contained in the waste gas are intercepted in the molecular sieve inside the adsorption zone, and the purified gas meeting the standard is directly discharged into the atmosphere. The rotary continuously rotates to adsorb VOCs, and gradually tends to be saturated. When the rotary rotates into the desorption zone, the high-temperature hot air of about 180-220℃ is continuously blown by the desorption fan 7, the VOCs adsorbed in the molecular sieve are desorbed and taken away at high temperature, and the rotary restores the adsorption capacity. After the desorption, the rotary rotates into the cooling zone, is blown by the cooling air, and is cooled to room temperature again, and then rotates into the adsorption zone to start the next adsorption. The desorption air volume of the rotary is small, which can greatly reduce the size of the rear-end treatment system.

[0029] The high-concentration waste gas after concentration is treated by the catalytic combustion bed;

[0030] The working process is as follows:

[0031] The front-end waste gas to be treated first removes the large particle dust, acid and alkali components in the waste gas through the scrubber 1;

[0032] The waste gas treated by the scrubber 1 is introduced into the rear-end mist filter 2, removes the liquid droplets and fine dust in the waste gas through the baffle mist removal layer, wire mesh mist removal layer and F9 filter bag in the mist filter 2, and ensures the service life of the rear-end zeolite rotary 4;

[0033] The waste gas treated by the mist filter 2 is adjusted in humidity by the temperature and humidity regulator 3. The high-temperature tail gas discharged from the catalytic combustion bed 9 is used as the heat source of the temperature and humidity regulator 3, and the temperature before and after the temperature and humidity regulator 3 is controlled by the interlocking of the temperature sensor and the analog quantity adjusting valve 13, so that the temperature of the waste gas is increased by 3-5℃, thereby adjusting the humidity of the waste gas to be within 80%RH;

[0034] The organic waste gas after dust removal and dehumidification treatment is flowed through the zeolite runner adsorption area 41 by the traction of the adsorption fan 5, wherein the organic components are intercepted, and the purified gas meeting the standard is discharged into the atmosphere through a chimney.

[0035] The continuous rotation of the runner delivers the volatile organic compounds adsorbed on the molecular sieve to the desorption area 43, and a small amount of gas (about 5% to 15% of the treatment air volume) at 180 to 220 DEG C continuously sweeps, the volatile organic compounds are desorbed from the molecular sieve, and are sent to the rear-end waste gas treatment system, and the molecular sieve in the desorption area 43 is regenerated;

[0036] The regenerated molecular sieve rotates into the cooling area 42, and the refrigerant can use external fresh air or the front-end organic waste gas. The cooling air is introduced into the desorption system by the desorption fan 7, and exchanges heat with the molecular sieve in the cooling area 42 of the runner, on the one hand, the cooling air is heated, and on the other hand, the cooling area 42 of the molecular sieve is cooled, and is rotated to the adsorption area 41 to continuously adsorb the organic components.

[0037] The cooling air is preliminarily heated after flowing through the molecular sieve in the cooling area 42, and is heated to 180 to 220 DEG C by the primary heat exchanger 10, and then sweeps the molecular sieve in the desorption area 43; the heat source of the primary heat exchanger 10 uses the high-temperature gas (450 to 550 DEG C) discharged by the catalytic combustion bed 9;

[0038] The gas desorbed from the zeolite runner desorption area 43 at a high temperature of about 100 to 120 DEG C is sent into the secondary heat exchanger 11 by the desorption fan 7, is heated, and is discharged into the catalytic combustion bed 9 through the first fire arrester 8. The organic waste gas is catalytically oxidized and decomposed in the catalytic combustion bed 9, the high-temperature tail gas generated after decomposition is discharged from the catalytic combustion bed 9, and is heat-exchanged after being the heat source of the primary heat exchanger 10 and the secondary heat exchanger 11, and is discharged through the second fire arrester 12;

[0039] The tail gas discharged after heat exchange by the two-stage heat exchanger has a temperature of about 100 DEG C, and is sent into the front-end adsorption pipeline through a pipeline: part of the tail gas is introduced into the temperature and humidity regulator 3 through the fourth pipeline 17 and the analog quantity adjusting valve 13 as a heat source to heat the waste gas to be treated; and part of the tail gas is discharged into the front-end pipeline of the scrubbing tower 1 through the fifth pipeline 18, is mixed with the large air volume and low concentration waste gas to be treated, and is discharged through the runner adsorption chimney, so that the tail gas is ensured to be discharged in a standard manner.

[0040] The whole process is automatically controlled by the PLC control program system through analysis and processing of the detection data such as temperature and pressure of the system.

[0041] The above-described embodiments only express the preferred embodiments of the present application, which are described in a more specific and detailed manner, but the present application is not limited to these embodiments. It should be pointed out that any improvement made by those skilled in the art without departing from the spirit of the present application falls within the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A high-efficiency energy-saving rotary combined catalytic combustion treatment device, characterized in that, The application relates to a waste gas treatment device, which comprises a washing tower (1), a mist filter (2), a temperature and humidity regulator (3), a zeolite rotary wheel (4), an exhaust chimney (6), a first fire barrier (8), a catalytic combustion bed (9), a first heat exchanger (10), a second heat exchanger (11), a second fire barrier (12), the inlet of the washing tower (1) is connected with a waste gas inlet pipe, the outlet of the washing tower (1) is connected with the inlet of the mist filter (2) through a pipeline, the outlet of the mist filter (2) is connected with the inlet of the temperature and humidity regulator (3) through a pipeline, the zeolite rotary wheel (4) is divided into an adsorption area (41), a cooling area (42) and a desorption area (43), the outlet of the temperature and humidity regulator (3) is connected with the inlet of the adsorption area (41) through a first pipeline (14), the outlet of the adsorption area (41) is connected with the exhaust chimney (6) through a pipeline; the first pipeline (14) is connected with the inlet of the cooling area (42) through a second pipeline (15), the outlet of the cooling area (42) is connected with the inlet of the first heat exchanger (10) through a pipeline, the outlet of the first heat exchanger (10) is connected with the inlet of the desorption area (43) through a pipeline, the outlet of the desorption area (43) is connected with the inlet of the second heat exchanger (11) through a pipeline, the outlet of the second heat exchanger (11) is connected with the inlet of the first fire barrier (8) through a pipeline, the outlet of the first fire barrier (8) is connected with the inlet of the catalytic combustion bed (9) through a pipeline, the outlet of the catalytic combustion bed (9) is connected with one end of the first heat exchanger (10) through a pipeline, the other end of the first heat exchanger (10) is connected with one end of the second heat exchanger (11) through a pipeline, the other end of the second heat exchanger (11) is connected with the inlet of the second fire barrier (12), the outlet of the second fire barrier (12) is connected with one end of a third pipeline (16), the third pipeline (16) is connected with the temperature and humidity regulator (3) through a fourth pipeline (17), and the other end of the third pipeline (16) is connected with the waste gas inlet pipe through a fifth pipeline (18).

2. A high efficiency energy saving combined catalytic combustion treatment device for rotating wheels as claimed in claim 1, wherein An adsorption fan (5) is arranged on the connecting pipeline between the outlet of the adsorption area (41) and the exhaust chimney (6).

3. The high-efficiency energy-saving rotary combined catalytic combustion treatment device according to claim 1, characterized in that, A desorption fan (7) is arranged on the connecting pipeline between the outlet of the desorption area (43) and the inlet of the second heat exchanger (11).

4. The high-efficiency energy-saving rotary combined catalytic combustion treatment device according to claim 1, characterized in that, An analog quantity adjusting valve (13) is arranged on the fourth pipeline (17).

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