Zeolite molecular sieve runner catalytic combustion system

Abstract

The utility model relates to the technical field of waste gas treatment, in particular to a zeolite molecular sieve rotating wheel catalytic combustion system which comprises a filtering unit, a zeolite rotating wheel unit, a desorption heat exchanger, a heating area, a catalytic combustion unit and a chimney. A gas outlet is formed in the other end of the adsorption area, and a part of gas exhausted from the gas outlet is sequentially connected to the adsorption area and the chimney; the other part is sequentially connected to a cooling area, a desorption heat exchanger, a desorption area, a desorption fan and a catalytic combustion unit, and an outlet of the catalytic combustion unit is connected with a chimney; the zeolite rotating wheel unit comprises a zeolite molecular sieve rotating wheel, the zeolite molecular sieve rotating wheel is divided into eight zeolite filling modules, a rotating shaft is fixedly sleeved with a fixing shaft, each zeolite filling module is in key connection with the fixing shaft, a fence is arranged on the periphery of each zeolite filling module, and outer flanges are arranged at the two ends of each fence respectively. And the adjacent outer flanges are fixed through bolts.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a zeolite molecular sieve rotor catalytic combustion system. Background Art

[0002] In order to meet the latest national and local environmental emission standards, it is necessary to add organic waste gas treatment equipment to treat the waste gas discharged from the workshop to meet the emission standards of relevant national and local environmental regulations, and at the same time minimize the pollution of waste gas to the environment. The combustion or recovery of large-volume, low-concentration organic waste gas not only requires very large-scale equipment, but also causes huge operating costs. For this problem, by using a zeolite molecular sieve adsorption concentration device, low-concentration and large-volume organic waste gas can be concentrated into high-concentration and small-volume air, thereby reducing equipment investment costs and operating costs, thereby achieving economical and effective organic waste gas treatment. However, the zeolite molecular sieve rotor in the zeolite rotor device needs to use special equipment for desorption and regeneration after adsorption saturation, which increases the cost of air purification, and when the zeolite rotor fails locally, it is inconvenient to replace the filling zeolite, which affects the adsorption and concentration effect. Utility Model Content

[0003] In order to solve the above technical problems, the utility model specifically adopts the following technical solutions.

[0004] A zeolite molecular sieve rotor catalytic combustion system is designed, comprising a filtering unit, a zeolite rotor unit, a desorption heat exchanger, a heating zone, a catalytic combustion unit, and a chimney. The zeolite rotor unit is divided into an adsorption zone, a desorption zone, and a cooling zone. An air inlet is provided at one end of the filtering unit, and an air outlet is provided at the other end. The gas discharged from the air outlet is divided into two paths, one of which is connected to the adsorption zone and the chimney in sequence; the other is connected to the cooling zone, the desorption heat exchanger, the desorption zone, the desorption fan, and the catalytic combustion unit in sequence. The outlet of the catalytic combustion unit is connected to the chimney.

[0005] The zeolite rotor unit includes a zeolite molecular sieve rotor installed on a frame through a rotating shaft. The zeolite molecular sieve rotor is divided into eight zeolite filling modules. A fixed shaft is fixedly mounted on the rotating shaft. Each zeolite filling module is keyed to the fixed shaft, and an enclosure is provided on the periphery of each zeolite filling module. Outer flanges are respectively provided at both ends of the enclosure, and the adjacent outer flanges are fixed by bolts.

[0006] Preferably, the filter unit is a three-stage dry filter with filter grades of G4, F7 and F9 respectively.

[0007] Preferably, the three-stage dry filter includes a filter box, three filter plates are respectively arranged in the filter box, three slots corresponding to the filter plates are respectively opened at the bottom of the filter box, and three sockets corresponding to the slots are respectively opened at the top of the filter box. Each filter plate is inserted into the slot at the bottom of the filter box through the socket, and the top of each filter plate extends from the socket and is commonly connected to a pressure plate, and tightening bolts are respectively provided at both ends of the pressure plate.

[0008] Preferably, a handle is provided on the pressing plate.

[0009] Preferably, a sealing ring is sleeved on each filter plate at the insertion opening.

[0010] Preferably, the catalytic combustion unit includes a box body, in which a heat exchange chamber, a heating chamber, a catalytic chamber and a transition chamber are arranged in sequence along the direction of airflow, a heater is provided on one side of the heating chamber, an air flow inlet is provided on the top of the heat exchange chamber, the air flow inlet is connected to the outlet of the desorption fan, an air outlet chamber is provided above the transition chamber, an exhaust port is provided on the top of the air outlet chamber, the heat exchange chamber is separated from the transition chamber and the air outlet chamber by an air permeable plate, a flame arrester is provided between the catalytic chamber and the heating chamber, and a catalytic layer is provided between the transition chamber and the catalytic chamber.

[0011] Preferably, an S-shaped heat exchange channel is provided in the heat exchange cavity.

[0012] Preferably, a main fan is connected between the adsorption zone and the chimney.

[0013] The beneficial effects of the utility model are:

[0014] 1. The utility model provides a three-stage dry filter, provides a socket and a slot in the filter box, and installs three filter plates on a pressure plate. When the filter plate needs to be replaced, the bolts at both ends of the pressure plate can be loosened and the pressure plate can be pulled up by the handle to remove the three filter plates from the socket, thereby realizing the disassembly and replacement of the filter plate.

[0015] 2. The utility model divides the molecular sieve rotor into an adsorption zone, a cooling zone and a desorption zone. The VOCs adsorbed in the molecular sieve rotor are desorbed and concentrated through hot air treatment under the action of the catalytic combustion unit and the desorption blower. The zeolite molecular sieve rotor after desorption and regeneration is cooled in the cooling zone. The air passing through the cooling zone is used as regeneration air after being heated, thereby achieving energy-saving effect.

[0016] 3. The utility model divides the zeolite filling in the zeolite molecular sieve rotor into eight zeolite filling modules, and uses fixing bolts on the outer flanges at both ends of the enclosure to fix the eight zeolite filling modules together to form a rotor, and then each module is connected to a fixed shaft key. When a local fault occurs, the local zeolite module can be replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall process of the utility model;

[0018] Figure 2 and Figure 3 is a schematic diagram of the structure of a zeolite wheel unit;

[0019] Figure 4 is a schematic diagram of the structure of the filtration unit;

[0020] Figure 5 is a schematic diagram of the structure of a catalytic combustion unit;

[0021] The numbers in the figure are: 1 filter unit, 11 filter box, 12 filter plate, 13 handle, 14 pressure plate, 15 air inlet, 16 air outlet, 17 air inlet, 2 zeolite rotor unit, 20 enclosure, 21 frame, 22 rotating shaft, 23 fixed shaft, 24 zeolite molecular sieve rotor, 25 outer flange, 26 zeolite filling module, 3 desorption fan, 4 catalytic combustion unit, 40 exhaust port, 41 box, 42 transition chamber, 43 heat exchange chamber, 44 heater, 45 heating chamber, 46 flame arrester, 47 catalytic chamber, 48 catalytic layer, 401 air outlet chamber, 402 breathable plate, 5 chimney. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0023] Example 1

[0024] A zeolite molecular sieve rotary catalytic combustion system, such as Figures 1 to 5 As shown, it includes a filtering unit 1, a zeolite rotor unit 2, a desorption heat exchanger, a catalytic combustion unit 4, and a chimney 5. The zeolite rotor unit 2 is divided into an adsorption zone, a desorption zone, and a cooling zone. An air inlet 15 is provided at one end of the filtering unit 1, and an air outlet 16 is provided at the other end. The gas discharged from the air outlet 16 is divided into two parts, one part of which is connected to the adsorption zone and the chimney 5 in sequence, and a main fan is connected between the adsorption zone and the chimney 5; the other part is connected to the cooling zone, the desorption heat exchanger, the desorption zone, the desorption fan 3, and the catalytic combustion unit 4 in sequence, and the outlet of the catalytic combustion unit 4 is connected to the chimney 5 through the heat exchanger;

[0025] The zeolite rotor unit 2 includes a zeolite molecular sieve rotor 24 mounted on a frame 21 via a rotating shaft 22. The zeolite molecular sieve rotor 24 is divided into eight zeolite filling modules 26, including one cooling zone and one desorption zone, and six adsorption zones. A fixed shaft 23 is fixedly mounted on the rotating shaft 22. Each zeolite filling module 26 is keyed to the fixed shaft 23, and an enclosure 20 is provided on the periphery of each zeolite filling module 26. External flanges 25 are respectively provided at both ends of the enclosure 20, and adjacent external flanges 25 are fixed by bolts. The eight zeolite filling modules 26 in the zeolite molecular sieve rotor 24 are modular zeolite fillings. When a local failure occurs, the bolts can be removed to separate the adjacent outer flanges 25 and replace the local zeolite filling modules; the zeolite rotor unit 2 uses the continuous process of adsorption-desorption concentration-cooling to adsorb and concentrate VOCs waste gas. The zeolite molecular sieve rotor is divided into three functional areas: adsorption area, desorption area and cooling area. Each area is separated by heat-resistant and solvent-resistant sealing materials. The zeolite molecular sieve rotor operates continuously in each functional area.

[0026] After passing through the pre-filter unit, the waste gas is sent to the adsorption zone of the zeolite molecular sieve rotor. In the adsorption zone (the area of ​​the adsorption zone is S1), VOCs in the organic waste gas are adsorbed and removed by the zeolite molecular sieve, and the organic waste gas is purified and discharged from the treatment zone of the zeolite molecular sieve rotor 24. The VOCs adsorbed in the molecular sieve rotor are desorbed and concentrated in the desorption zone (the area of ​​the desorption zone is S2) by hot air treatment with a small air volume of about 200°C. The concentration multiple is generally 5 to 25 times, and the concentration multiple n = (S1×V1) / (S2×V2)), where S1 / S2 = 10:1, V2 = (0.5 to 2.5).

[0027] By using zeolite molecular sieve rotor adsorption concentration, low-concentration and large-volume organic waste gas can be concentrated into high-concentration and small-volume, thereby reducing equipment investment costs and operating costs, thereby achieving economical and effective organic waste gas treatment.

[0028] Filter unit 1 is a three-stage dry filter, which adopts a dry paint mist filter with filtration grades of G4, F7, and F9 respectively; the G4-level coarse-efficiency filter is composed of breakage-resistant glass fiber filter material, the fiber has a gradually increasing structure, the average paint mist capture rate is as high as over 95%, and the temperature resistance is 80°C; the F7 and F9 medium and high-efficiency filter materials are non-woven fabrics composed of organic synthetic fibers and microfibers, with a gradually increasing fiber structure, the average capture efficiency is as high as over 99%, and the temperature resistance is 90°C.

[0029] The three-stage dry filter includes a filter box 11, in which three filter plates 12 are arranged respectively, three slots corresponding to the filter plates 12 are respectively opened at the bottom of the filter box 11, and three sockets corresponding to the slots are respectively opened at the top of the filter box 11. Each filter plate 12 is inserted into the slot at the bottom of the filter box 11 through the socket, and the top of each filter plate 12 extends out of the socket and is connected to a pressing plate 14. The two ends of the pressing plate 14 are respectively provided with clamping bolts, and a sealing ring is respectively sleeved at the socket on each filter plate 12, and a handle 13 is provided on the pressing plate 14. An air inlet 17 is also opened above the air inlet 15 at one end of the filter box 11. The air inlet 15 is used for the introduction of exhaust gas. When exhaust gas enters, the air inlet 15 is opened and the air inlet 17 is blocked; the air inlet 17 is used to open and use the equipment during maintenance and initial adjustment, and the air inlet 15 is blocked at this time.

[0030] When the filter plates 12 need to be replaced, the bolts can be loosened, and the handle 13 can be pulled upwards to drive the three filter plates 12 to be taken out and replaced together through the pressing plate 14 .

[0031] The catalytic combustion unit 4 includes a box 41, and the box 41 uses a high-aluminum aluminum silicate fiber insulation module inside, with a maximum insulation thickness of 200mm, and the insulation effect is better than ordinary aluminum or high-purity fiber cotton. The insulation is carried out in accordance with the requirements of GB4272 "General Rules for Insulation Design of Equipment and Pipelines", and a warning sign is set at the high-temperature part.

[0032] A heat exchange chamber 43, a heating chamber 45, a catalytic chamber 47 and a transition chamber 42 are arranged in sequence in the box body 41 along the direction of the airflow. A heater 44 is arranged on one side of the heating chamber 45, an air flow inlet is arranged at the top of the heat exchange chamber 43, and an S-shaped heat exchange channel is arranged in the heat exchange chamber 43 to enhance the heat exchange effect. The air inlet is connected to the outlet of the desorption fan 3, an air outlet chamber 401 is provided above the transition chamber 42, an exhaust port 40 is provided at the top of the air outlet chamber 401, the heat exchange chamber 43 is separated from the transition chamber 42 and the air outlet chamber 401 by a breathable plate 402, a flame arrester 46 is provided between the catalytic chamber 47 and the heating chamber 45, a catalytic layer 48 is provided between the transition chamber 42 and the catalytic chamber 47, the side wall between the transition chamber 42 and the catalytic chamber 47 is inclined, so that the catalytic layer 48 is also inclined, which can maximize the contact with the exhaust gas and enhance the catalytic treatment effect of the exhaust gas. The catalyst on the catalytic layer 48 adopts a Pt and Pd noble metal catalyst with a ceramic-based carrier, which has high dispersion of noble metal active sites, high catalytic activity, long service life, small pressure loss, and reduced energy consumption. The catalyst uses a ceramic carrier treated with high temperature stabilization to ensure that the catalyst is not sintered, and maintains the catalyst's high activity specific surface area, high mechanical strength, and high thermal stability.

[0033] The working method of the utility model is as follows: after the exhaust gas passes through the filter box 11, a part of the exhaust gas is sent to the adsorption zone of the zeolite molecular sieve rotor 24 through the air outlet 16, and VOCs in the organic exhaust gas in the adsorption zone are adsorbed and removed by the zeolite molecular sieve, and the organic exhaust gas is directly discharged from the chimney 5 after being purified; another part of the exhaust gas after filtration passes through the air outlet 16 under the guidance of the desorption fan 3, and then passes through the cooling zone of the zeolite molecular sieve rotor 24, the desorption heat exchanger, and the desorption zone of the zeolite molecular sieve rotor 24 in sequence, and enters the catalytic combustion unit; and the working process of the catalytic combustion unit is as follows: first, the heater in the box body 41 heats the heating chamber, and the VOCs from the zeolite rotor unit are removed by the desorption fan 3. The attached small air volume and high concentration organic waste gas first enters the heat exchange chamber through the desorption fan for heat exchange to realize the recovery of waste heat. After the heat exchanger, the waste gas is heated and heated through the heating chamber. The heated organic waste gas is blocked by the flame arrester 46 to heat the box body 41 with sparks. The catalyst in the catalytic layer is heated to a temperature of 250 degrees to 300 degrees to catalyze the reaction of VOC into carbon dioxide and water, so that the organic components are purified. At the same time, the organic waste gas is cracked to release heat to further increase the gas temperature. The purified exhaust gas is passed through the heat exchanger to realize the recovery of waste heat. Then, the low-temperature gas after heat exchange passes through the outlet cavity 401 and is discharged from the outlet to the chimney for discharge.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A zeolite molecular sieve rotor catalytic combustion system, characterized in that: It comprises a filtering unit (1), a zeolite rotor unit (2), a desorption heat exchanger, a catalytic combustion unit (4), and a chimney (5); the zeolite rotor unit (2) is divided into an adsorption zone, a desorption zone, and a cooling zone; an air inlet (15) is provided at one end of the filtering unit (1), and an air outlet (16) is provided at the other end; the gas discharged from the air outlet (16) is divided into two parts, one part of which is connected to the adsorption zone and the chimney (5) in sequence; the other part is connected to the cooling zone, the desorption heat exchanger, the desorption zone, the desorption fan (3), and the catalytic combustion unit (4) in sequence; the outlet of the catalytic combustion unit (4) is connected to the chimney (5); The zeolite wheel unit (2) comprises a zeolite molecular sieve wheel (24) mounted on a frame (21) via a rotating shaft (22); the zeolite molecular sieve wheel (24) is divided into eight zeolite filling modules (26); a fixed shaft (23) is fixedly mounted on the rotating shaft (22); each zeolite filling module (26) is key-connected to the fixed shaft (23); and a fence (20) is provided on the periphery of each zeolite filling module (26); outer flanges (25) are respectively provided at both ends of the fence (20); and the adjacent outer flanges (25) are fixed by bolts.

2. The zeolite molecular sieve rotary catalytic combustion system according to claim 1, characterized in that: The filter unit (1) is a three-stage dry filter, and the filter grades are G4, F7, and F9 respectively.

3. The zeolite molecular sieve rotary catalytic combustion system according to claim 2, characterized in that: The three-stage dry filter comprises a filter box (11), three filter plates (12) are respectively arranged in the filter box (11), three slots corresponding to the filter plates (12) are respectively opened at the bottom of the filter box (11), and three sockets corresponding to the slots are respectively opened at the top of the filter box (11), each filter plate (12) is respectively inserted into the slot at the bottom of the filter box (11) through the socket, and the top of each filter plate (12) extends out of the socket and is commonly connected to a pressure plate (14), and clamping bolts are respectively provided at both ends of the pressure plate (14).

4. The zeolite molecular sieve rotary catalytic combustion system according to claim 3, characterized in that: A handle (13) is provided on the pressing plate (14).

5. The zeolite molecular sieve rotary catalytic combustion system according to claim 3, characterized in that: A sealing ring is sleeved on each filter plate (12) at the insertion opening.

6. The zeolite molecular sieve rotary catalytic combustion system according to claim 1, characterized in that: The catalytic combustion unit (4) comprises a housing (41), wherein a heat exchange chamber (43), a heating chamber (45), a catalytic chamber (47), and a transition chamber (42) are sequentially arranged in the housing (41) along the direction of air flow; a heater (44) is arranged on one side of the heating chamber (45); an air flow inlet is arranged at the top of the heat exchange chamber (43), and the air flow inlet is connected to the outlet of the desorption fan (3); an air outlet chamber (401) is arranged above the transition chamber (42); an exhaust port (40) is arranged at the top of the air outlet chamber (401); the heat exchange chamber (43) is separated from the transition chamber (42) and the air outlet chamber (401) by an air permeable plate (402); a flame arrester (46) is arranged between the catalytic chamber (47) and the heating chamber (45); and a catalytic layer (48) is arranged between the transition chamber (42) and the catalytic chamber (47).

7. The zeolite molecular sieve rotary catalytic combustion system according to claim 6, characterized in that: An S-shaped heat exchange channel is provided in the heat exchange cavity (43).

8. The zeolite molecular sieve rotary catalytic combustion system according to claim 1, characterized in that: A main fan is connected between the adsorption zone and the chimney (5).

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