Device for deeply deodorizing malodorous waste gas

Abstract

The utility model provides a device for deeply deodorizing malodorous waste gas and belongs to the technical field of malodorous waste gas treatment and environmental protection equipment. The device comprises a guide pipe, a zeolite adsorption device, a valve, a heat exchanger, a temperature transmitter and a catalytic combustion furnace, and is characterized in that the valve and the temperature transmitter are arranged on the guide pipe, the guide pipe is sequentially connected with the zeolite adsorption device, the heat exchanger and the catalytic combustion furnace, and the heat exchanger and the catalytic combustion furnace are in two-way connection through the guide pipe. The whole device can carry out the following processes: an odor adsorption process, a desorption process of the adsorption device and a cooling process of the adsorption device. The three processes can be switched at will through the valves and do not interfere with one another, the treatment effect of a traditional deodorization process can be further improved, and the requirement for unorganized emission of the factory boundary is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of malodorous waste gas treatment and environmental protection equipment, and particularly relates to a fixed-bed zeolite adsorption and desorption system device for deep deodorization. Background Technique

[0002] At present, in the municipal field, the commonly used treatment processes for malodorous waste gas are: chemical washing, ion method, UV photocatalytic oxidation, activated carbon adsorption and biological deodorization. According to the requirements of the "Emission Standard of Odor Pollutants GB14554-93", the odor concentration of the organized emission at a 15-meter exhaust stack is <2000 (dimensionless, the same below), and the odor concentration of the secondary standard at the factory boundary is <20, and the primary standard is <10. Tianjin, Shanghai and other places have issued local standards for the emission of odor pollutants, setting the requirement for the odor concentration of the organized emission at a 15-meter exhaust stack to <1000, and the odor concentration at the factory boundary to <10 (non-industrial area). The emission requirements for odor pollution are constantly increasing, and the efficiency of the commonly used processes in treating malodorous waste gas has been exploited to the extreme.

[0003] At present, usually 2-3 deodorization processes are used in combination. Even so, the odor concentration of the waste gas discharged after being treated by the deodorization system is still about 300-500, which can meet the requirements of organized emission. However, for many municipal facilities close to residential areas, considering the NIMBY effect, the exhaust stack is designed to be cancelled and changed to unorganized emission. The existing deodorization processes and equipment cannot meet the requirements of unorganized emission, and it is easy to cause problems such as excessive emissions and complaints from surrounding residents. Adding activated carbon adsorption can further reduce the odor concentration, but considering that the activated carbon needs to be replaced frequently after adsorption saturation, and the waste activated carbon removed needs to be managed as hazardous waste, the requirements and costs for the operation and maintenance management of the deodorization equipment will increase. Content of the Utility Model

[0004] In order to solve the above technical problems, the utility model provides a device for deep deodorization of malodorous waste gas, which can further improve the treatment effect of the traditional deodorization process and meet the requirements of unorganized emission at the factory boundary.

[0005] In order to solve the above problems, the technical solution adopted by the utility model is as follows:

[0006] A device for deep deodorization of malodorous waste gas includes a conduit, a zeolite adsorption device, a valve, a heat exchanger, a temperature transmitter and a catalytic combustion furnace. The valve and the temperature transmitter are arranged on the conduit. The conduit is sequentially connected to the zeolite adsorption device, the heat exchanger and the catalytic combustion furnace. Among them, the heat exchanger and the catalytic combustion furnace are connected bidirectionally through the conduit.

[0007] Further, one end of the conduit is connected to the outlet of the conventional deodorization, and the other end is connected to the exhaust stack.

[0008] Furthermore, there are 5 groups of the zeolite adsorption devices, and the 5 groups of zeolite adsorption devices are arranged in parallel between the conventional deodorization outlet and the exhaust stack. An adsorption inlet valve, an adsorption outlet valve, a desorption inlet valve, and a desorption outlet valve are arranged around each group of zeolite adsorption devices through conduits.

[0009] Furthermore, the valves include: an adsorption inlet valve, an adsorption outlet valve, a desorption inlet valve, a desorption outlet valve, a desorption switching valve a, a desorption switching valve b, a cooling discharge valve, a desorption discharge valve, and a temperature reduction mixing air ratio valve; the adsorption inlet valve and the adsorption outlet valve are respectively arranged on the left and right sides of the zeolite adsorption device; the desorption inlet valve and the desorption outlet valve are respectively arranged on the lower and upper sides of the zeolite adsorption device; the desorption switching valve a and the desorption switching valve b are sequentially arranged at the rear end of the conduit provided with the desorption outlet valve; the cooling discharge valve is arranged on the conduit between the desorption switching valve a and the adsorption fan.

[0010] Furthermore, the adsorption system of the device for deep deodorization of malodorous exhaust gas is composed of connecting the adsorption inlet valve, the zeolite adsorption device, the adsorption outlet valve, and the adsorption fan in sequence through conduits.

[0011] Furthermore, the desorption system of the device for deep deodorization of malodorous exhaust gas is composed of a fresh air filter, a temperature reduction mixing air ratio valve, a high-temperature resistant pipeline mixer + flame arrester, a desorption fan, a desorption inlet valve, a desorption outlet valve, a desorption switching valve a, a desorption switching valve b, a heat exchanger, a catalytic combustion furnace, and a desorption discharge valve connected through conduits.

[0012] Furthermore, the cooling system of the device for deep deodorization of malodorous exhaust gas is composed of a fresh air filter, a temperature reduction mixing air ratio valve, a high-temperature resistant pipeline mixer + flame arrester, a desorption fan, a desorption inlet valve, a desorption outlet valve, a desorption switching valve a, a cooling discharge valve, and an adsorption fan connected through conduits.

[0013] Furthermore, a high-temperature resistant heat insulation material layer is coated outside between each adsorption unit module and outside the catalytic combustion furnace.

[0014] Compared with the prior art, the advantages of the present utility model are as follows:

[0015] 1) The process of the present utility model can further improve the treatment effect of the traditional deodorization process and meet the requirements of factory boundary unorganized emissions;

[0016] 2) The equipment of the present utility model has a high integration degree and an integrated design, reducing the on-site installation workload;

[0017] 3) A catalytic combustion desorption system is added to desorb and regenerate the adsorbent online, prolonging the service life of the adsorbent. The adsorption service life is more than 3 years, reducing the operation cost;

[0018] 4) The adsorption and desorption processes of the present utility model can operate automatically, and are automatically controlled by instruments and valves, reducing the difficulty of operation and maintenance.

[0019] 5) The interior of the equipment and the housing of the present utility model are heat-insulated with multiple layers of new materials, and the surface temperature is below 50 °C, ensuring the safety of operation and maintenance. Description of the Drawings

[0020] Figure 1 is the process diagram of the system operation of the present utility model;

[0021] Figure 2 is the elevation view of the system operation process of the present utility model;

[0022] Figure 3 is the plan view of the system operation process of the present utility model;

[0023] Among them, the reference numerals are: 1, adsorption inlet valve; 2, temperature transmitter; 3, zeolite adsorption device; 4, adsorption outlet valve; 5, desorption inlet valve; 6, desorption outlet valve; 7, desorption switching valve a; 8, cooling discharge valve; 9, desorption discharge valve; 10, desorption switching valve b; 11, heat exchanger; 12, catalytic combustion furnace; 13, fresh air filter; 14, cooling and mixing air ratio valve; 15, high-temperature pipeline mixer + flame arrester; 16, desorption fan; 17, adsorption fan. Detailed Embodiments

[0024] In order to make the above objects, features, and advantages of the present utility model more obvious and understandable, the following detailed description of the specific embodiments of the present utility model will be given in conjunction with specific embodiments.

[0025] Please refer to the attached Figures 1-3 , the present utility model provides a technical solution:

[0026] A deep deodorization zeolite adsorption and desorption system device includes an adsorption system, a desorption system, a cooling system, and a catalytic combustion system; as Figure 1 shown, the adsorption system includes an adsorption inlet valve 1, a zeolite adsorption device 3, an adsorption outlet valve 4, and an adsorption fan 17. Multiple zeolite adsorption devices 3 are arranged in parallel, preferably 5; an adsorption inlet valve 1 is provided on the left side of each zeolite adsorption device 3 through a pipeline, and an adsorption outlet valve 4 is provided on the right side of each zeolite adsorption device 3 through a pipeline. The pipelines where all the adsorption inlet valves 1 are located are connected to the conventional deodorization outlet, and the pipelines where all the adsorption outlet valves 4 are located are connected to the adsorption fan 17.

[0027] As Figure 1As shown in the figure, the desorption system includes a fresh air filter 13, a cooling air mixing ratio valve 14, a high-temperature resistant pipeline mixer + flame arrester 15, a desorption fan 16, a desorption inlet valve 5, a zeolite adsorption device 3, a temperature transmitter 2, a desorption outlet valve 6, a desorption switching valve a 7, a desorption switching valve b 10, a heat exchanger 11, and a catalytic combustion furnace 12. The fresh air filter 13, the cooling air mixing ratio valve 14, and the high-temperature resistant pipeline mixer + flame arrester 15 are sequentially connected to one side of the desorption fan 16 through conduits. Five groups of parallel zeolite adsorption devices 3 are connected to the conduits provided with desorption inlet valves 5 at the lower ends, and five groups of parallel zeolite adsorption devices 3 are connected to the conduits provided with desorption outlet valves 6 at the upper ends. All the conduits provided with desorption inlet valves 5 are connected to the other side of the desorption fan 16, and all the conduits provided with desorption outlet valves 6 are connected to the desorption switching valve a 7. The other end of the desorption switching valve a 7 is connected to a desorption switching valve b 10 through a conduit, and the desorption switching valve b 10 is further connected to the heat exchanger 11 through a conduit. The heat exchanger 11 and the catalytic combustion furnace 12 are connected bidirectionally through conduits, and the heat exchanger 11 is also connected to the conduit between the cooling air mixing ratio valve 14 and the high-temperature resistant pipeline mixer + flame arrester 15 through a conduit. The fresh air blown from the fresh air filter 13 by the desorption fan 16 enters the desorption pipeline through the cooling air mixing ratio valve 14 and the high-temperature resistant pipeline mixer + flame arrester 15, and then enters the zeolite adsorption device 3 through the desorption inlet valve 5 for desorption. The desorbed waste gas is discharged into the desorption pipeline through the desorption outlet valve 6, enters the heat exchanger 11 through the desorption switching valve a 7 and the desorption switching valve b 10. The temperature of the waste gas rises through the heating of the heat exchanger 11, and then the waste gas is discharged into the catalytic combustion furnace 12. The organic matter in the waste gas is decomposed into water and carbon dioxide through catalytic combustion, and the high-temperature gas is introduced into the heat exchanger 11 for heat exchange and cooling. The cooled gas is then recycled through the conduit to the conduit between the cooling air mixing ratio valve 14 and the high-temperature resistant pipeline mixer + flame arrester 15, and is injected into the desorption pipeline together with the fresh air through the desorption fan 16 for cyclic desorption.

[0028] The cooling system includes a fresh air filter 13, a cooling air mixing ratio valve 14, a high-temperature resistant pipeline mixer + flame arrester 15, a desorption fan 16, a desorption inlet valve 5, a zeolite adsorption device 3, a temperature transmitter 2, a desorption outlet valve 6, a desorption switching valve a 7, a cooling discharge valve 8, and an adsorption fan 17. The fresh air filter 13, the cooling air mixing ratio valve 14, and the high-temperature resistant pipeline mixer + flame arrester 15 are sequentially connected to one side of the desorption fan 16 through conduits. Five groups of parallel zeolite adsorption devices 3 are connected to the conduits provided with desorption inlet valves 5 at the lower ends, and five groups of parallel zeolite adsorption devices 3 are connected to the conduits provided with desorption outlet valves 6 at the upper ends. All the conduits provided with desorption inlet valves 5 are connected to the other side of the desorption fan 16, and all the conduits provided with desorption outlet valves 6 are connected to the desorption switching valve a 7. The other end of the desorption switching valve a 7 is connected to the adsorption fan 17 through a pipeline provided with a cooling discharge valve 8.

[0029] As Figure 1 shown, the catalytic combustion system includes a heat exchanger 11 and a catalytic combustion furnace 12. The heat exchanger 11 and the catalytic combustion furnace 12 are connected bidirectionally through a conduit. The heat exchanger 11 is divided into a heat exchange section and a heating section. The heating section first heats the desorbed waste gas. After reaching the predetermined temperature of the catalytic combustion furnace 12, the waste gas is discharged into the catalytic combustion furnace 12 for catalytic combustion, degrading the organic matter in the waste gas into water and carbon dioxide. The high-temperature gas after removing the organic matter is then guided back into the heat exchanger 11, and heat recovery is completed in the heat exchange section. The cooled gas flows back through the conduit to the conduit between the cooling air mixing ratio valve 14 and the high-temperature resistant pipeline mixer + flame arrester 15, and is injected into the desorption pipeline together with fresh air through the desorption fan 16 for the next round of desorption.

[0030] The working principle of the present utility model is as follows: When the odor concentration is still around 300 - 500 after deodorization by the conventional deodorization system, the odor enters the adsorption system through the conventional deodorization outlet. At this time, all the adsorption inlet valves 1 and adsorption outlet valves 4 are opened, other valves are closed, and the adsorption fan 17 is started. The odor will enter the corresponding zeolite adsorption device 3 through each adsorption inlet valve 1 via the conduit. Under the action of the air guiding plate, it passes through the zeolite adsorption layer from bottom to top. The odor component molecules in the waste gas enter the voids of the zeolite and are adsorbed, removed from the air, achieving the effect of deep deodorization. The purified air is discharged into the atmosphere under the action of the adsorption fan 17.

[0031] As the adsorption process progresses, when the zeolite adsorption device 3 is saturated with adsorption, hot air is used for desorption and regeneration, and the 5 adsorption units are desorbed in sequence (4 adsorption and 1 desorption). When the 1# adsorption unit is desorbed, the corresponding desorption air valve is opened, the adsorption air valve is closed, the desorption switching valve a 7 and the desorption switching valve b 10 are opened, the desorption discharge valve 9 and the cooling air mixing ratio valve 14 are opened to the set opening degrees respectively, and the cooling discharge valve 8 is closed. The heating system of the catalytic combustion furnace 12 is started. The high-concentration waste gas (100 °C) desorbed comes to about 150 °C after being heated by the heat exchanger 11 and enters the catalytic combustion furnace 12. It is first heated to 250 - 300 °C by the heater, and then under the action of the catalyst, the malodorous components are oxidized and decomposed into carbon dioxide and water. The high-temperature gas discharged from the catalytic combustion furnace 12 is cooled to about 200 °C by the heat exchanger 11. At the high-temperature resistant pipeline mixer 15, it is mixed and cooled with the filtered fresh air to about 150 °C, and then enters the 1# adsorption module to heat and desorb the zeolite. The high-temperature and high-concentration waste gas desorbed enters the catalytic combustion furnace 12, and this process is carried out in a cycle to realize the regeneration of the zeolite adsorption module. The desorption discharge valve 9 discharges the excess gas to maintain the balance of the desorption air volume of the system. The thermocouples in the desorption pipeline and the adsorption module feedback the temperature information to the PLC controller, and the temperature during the desorption process is maintained stable and controllable by controlling the opening degrees of the cooling air mixing ratio valve 14 and the desorption discharge valve 9. The desorption fan 16 provides power for the desorption process.

[0032] After the zeolite adsorption module is regenerated by hot air desorption, its temperature is between 100 - 150 °C and it cannot be directly put into the adsorption work. It needs to be cooled first to normal temperature before continuing the adsorption work. To save energy, only the adsorption module is cooled and the catalytic combustion furnace is not cooled. When the 1# adsorption unit is cooled, the corresponding desorption air valve is opened, the adsorption air valve is closed, the desorption switching valve a 7 is opened, the desorption switching valve b 10 is closed, the cooling air mixing ratio valve 14 is fully opened, the desorption discharge valve 9 is closed, the cooling discharge valve 8 is opened, and the desorption fan 16 is opened. Under the action of the desorption fan 16, fresh air enters the adsorption module to cool the zeolite, and then is discharged into the atmosphere through the cooling discharge valve 8. The zeolite adsorption module is cooled by continuous fresh air blowing. After the cooling is completed, it is put back into the adsorption work, and at the same time, the desorption work of the next module is started.

[0033] The utility model can be directly connected to the rear end of the existing deodorization system to deeply deodorize the waste gas to meet the requirements of odorless waste gas unorganized emission. The designed treatment air volume of the whole module is 6000 m 3 / h, and it is internally divided into 5 zeolite adsorption units. The designed treatment air volume of each unit is 1500 m 3 / h, 4 for adsorption and 1 for desorption, and the switching is alternately controlled by valves. The module integrates a desorption system (air volume 400 m 3 / h): The desorption fan 16, temperature transmitter 2, air valve, heat exchanger 11, heater (40kw), and catalytic combustion furnace 12. Between the adsorption unit modules and outside the catalytic furnace, a new type of high-temperature resistant thermal insulation material is coated to avoid the influence of high temperature during desorption on the adsorption system.

[0034] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An apparatus for deeply deodorizing malodorous waste gas, comprising a conduit, a zeolite adsorption device (3), a valve, a heat exchanger (11), a temperature transmitter (2) and a catalytic combustion furnace (12), characterized in that, The valve and the temperature transmitter (2) are arranged on the conduit, and the conduit is sequentially connected to a zeolite adsorption device (3), a heat exchanger (11), and a catalytic combustion furnace (12), wherein the heat exchanger (11) and the catalytic combustion furnace (12) are connected bidirectionally through a conduit.

2. The device for deep deodorization of malodorous waste gas according to claim 1, characterized in that, One end of the conduit is connected to a conventional deodorization outlet, and the other end is connected to an exhaust stack.

3. The device for deep deodorization of malodorous exhaust gas according to claim 1, characterized in that, There are 5 groups of the zeolite adsorption devices (3), and the 5 groups of zeolite adsorption devices (3) are arranged in parallel between the conventional deodorization outlet and the exhaust stack. An adsorption inlet valve (1), an adsorption outlet valve (4), a desorption inlet valve (5), and a desorption outlet valve (6) are arranged around each group of zeolite adsorption devices (3) through conduits.

4. The device for deep deodorization of malodorous exhaust gas according to claim 1, wherein, The valves include: an adsorption inlet valve (1), an adsorption outlet valve (4), a desorption inlet valve (5), a desorption outlet valve (6), a desorption switching valve a (7), a desorption switching valve b (10), a cooling discharge valve (8), a desorption discharge valve (9), and a temperature reduction mixing ratio valve (14); the adsorption inlet valve (1) and the adsorption outlet valve (4) are respectively arranged on the left and right sides of the zeolite adsorption device (3); the desorption inlet valve (5) and the desorption outlet valve (6) are respectively arranged on the lower and upper sides of the zeolite adsorption device (3); the desorption switching valve a (7) and the desorption switching valve b (10) are sequentially arranged at the rear end of the conduit provided with the desorption outlet valve (6); the cooling discharge valve (8) is arranged on the conduit between the desorption switching valve a (7) and the adsorption blower (17).

5. The device for deep deodorization of malodorous waste gas according to claim 1, wherein, An adsorption system of the device for deep deodorization of malodorous waste gas is composed of an adsorption inlet valve (1), a zeolite adsorption device (3), an adsorption outlet valve (4), and an adsorption blower (17) connected in sequence through a conduit.

6. The device for deep deodorization of malodorous waste gas according to claim 1, wherein, A desorption system of the device for deep deodorization of malodorous waste gas is composed of a fresh air filter (13), a temperature reduction mixing ratio valve (14), a high-temperature resistant pipeline mixer + flame arrester (15), a desorption blower (16), a desorption inlet valve (5), a desorption outlet valve (6), a desorption switching valve a (7), a desorption switching valve b (10), a heat exchanger (11), a catalytic combustion furnace (12), and a desorption discharge valve (9) connected through a conduit.

7. The device for deep deodorization of malodorous waste gas according to claim 1, characterized in that, A cooling system of the device for deep deodorization of malodorous waste gas is composed of a fresh air filter (13), a temperature reduction mixing ratio valve (14), a high-temperature resistant pipeline mixer + flame arrester (15), a desorption blower (16), a desorption inlet valve (5), a desorption outlet valve (6), a desorption switching valve a (7), a cooling discharge valve (8), and an adsorption blower (17) connected through a conduit.

8. The device for deep deodorization of malodorous exhaust gas according to claim 1, wherein, High-temperature resistant heat insulation material layers are coated outside between each adsorption unit module and outside the catalytic combustion furnace (12).

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