CN205579597U - Instant heating type RCO organic waste gas purification device - Google Patents

Abstract

The utility model discloses an instant heat type RCO organic waste gas purification device, which comprises a catalytic oxidation box body, a waste gas inlet pipe, a purified gas outlet pipe, a fan and a cleaning pipeline. The catalytic oxidation box body is composed of multiple sets of catalytic oxidation shells , the adjacent two sets of catalytic oxidation shells are connected through the connecting pipes at the top, the bottom of the catalytic oxidation shell is provided with an air inlet and an exhaust port, the air inlet is connected with a backflow cleaning port, and the catalytic oxidation shell The middle part is provided with a thermal storage ceramic layer, a catalyst layer and a heating layer, and the thermal storage ceramic layer is installed below the catalyst layer, and the number of catalytic oxidation casings on the catalytic oxidation box body is not less than two; the utility model will any Two catalytic oxidation shells and connecting pipes form a working unit. When a catalytic oxidation device is switched from the intake state to the idle state, part of the gas is passed through the cleaning pipeline to purge the catalytic oxidation device, which solves the problem of the catalytic oxidation device working state. VOCs leakage problem when switching.

Description

an instant heat RCO Organic waste gas purification device

technical field

The utility model relates to the technical field of environmental protection, in particular to an organic waste gas treatment device, in particular to an instant heating type RCO organic waste gas purification device.

Background technique

With the development of my country's economy, the impact of volatile organic compounds (VOCs) from industrial stationary sources on air pollution in key urban agglomerations and key regions in my country has become increasingly prominent. VOCs are involved in many industries, including coating technology, petroleum and petrochemical, packaging and printing, pharmaceutical and chemical industries, etc. In May 2010, the General Office of the State Council put forward the requirements to strengthen the prevention and control of volatile organic compounds. The Ministry of Finance, the Development and Reform Commission, and the Ministry of Environmental Protection jointly issued the "Pilot Measures for Volatile Organic Compounds Pollutant Discharge Charges", which also reflects the country's great importance to VOCs pollution control.

At present, VOCs purification treatment technology can be divided into two categories: recovery technology and destruction technology. Recovery technology is the enrichment and separation of organic pollutants through physical methods using selective adsorption or selective permeation, including adsorption, absorption, condensation and membrane separation. Destruction technology is a method of oxidizing organic pollutants into harmless small molecules such as carbon dioxide and water through oxidation reactions, including catalytic combustion, catalytic oxidation, biological oxidation, low-temperature plasma, and photocatalytic oxidation. In view of the characteristics of high emission intensity of industrial VOCs, various types of pollutants, and long duration, regenerative catalytic oxidation technology or regenerative catalytic oxidation technology integrated with adsorption and concentration technology has become the first choice for industrial VOCs pollution control.

At the same time, conventional regenerative catalytic oxidation (RCO) equipment on the market generally uses a resistance wire heating tube preheating system, and the heating rate of the resistance wire itself is low. The starting speed becomes slower, the heating inertia is large, and the starting energy consumption is high.

Currently, a two-body regenerative catalytic oxidation device is commonly used. For example, CN 102721073A discloses a regenerative catalytic oxidation device with waste heat utilization, which includes two identical catalytic oxidation devices, and each catalytic oxidation device includes an upper, a The lower regenerator, auxiliary heater, temperature sensor, catalyst is installed between the upper and lower regenerators, the reversing valve is a four-way reversing valve, and the reversing valve is connected to the bottom of the two catalytic oxidation devices through pipelines. The upper part of each catalytic oxidation device is connected, the connecting pipeline is provided with a waste heat utilization device, and the top of each catalytic oxidation device is provided with an emergency discharge valve. The device uses the heat generated in the catalytic combustion process to maintain the continuous operation of catalytic combustion, and installs the waste heat utilization device on the upper part of the two catalytic oxidation devices, and transfers the heat generated by catalytic combustion to the medium for extracting heat through a heat exchanger, and recovers excess heat. However, the device changes the airflow direction through the reversing valve. When the reversing operation is performed, part of the waste gas to be treated will inevitably flow directly to the gas outlet, causing waste gas leakage. In addition, the device needs to heat the organic waste gas first. Catalytic combustion consumes a lot of energy.

CN 103216838A discloses a non-leakage regenerative catalytic oxidation device, which includes four catalytic oxidation devices and five reversing valves, and the reversing valves are lift-type three-way stop valves, wherein every two catalytic oxidation devices and two reversing valves The reversing valves form a working unit, and the two intake lifting three-way stop valves of the two working units are respectively connected with the two nozzles of the fifth reversing valve. The catalytic oxidation device is equipped with heat storage materials and catalysts, and the working unit Inside, the air intake and air outlet lifting three-way stop valves are respectively connected to the bottom of the two catalytic oxidation devices through pipelines, and the reversing operation in each working unit is carried out in a non-working state. The device connects two two-body regenerative catalytic oxidation devices through a lift-type three-way stop valve, and the reversing operation in each working unit is carried out in a non-working state. However, the equipment utilization rate of this device is low, and the leakage problem of part of the waste gas to be treated is not fundamentally solved.

In addition, the catalytic oxidation reaction in the VOCs catalytic oxidation device is often prone to deflagration and other situations, which affect the safe production of enterprises. How to achieve high-efficiency and low-consumption removal of VOCs while ensuring the safety of the device is an important problem to be solved.

Contents of the invention

In view of the above existing problems, the purpose of this utility model is to provide a regenerative VOCs catalytic oxidation device with compact structure, convenient energy saving, high purification efficiency of VOCs waste gas, simple operation, precise control, high thermal efficiency and small thermal inertia.

In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows: an instant heat type RCO organic waste gas purification device, including a catalytic oxidation box, a waste gas inlet pipe, a purified gas outlet pipe, a fan and a cleaning pipeline, the catalytic The oxidation box is composed of multiple sets of catalytic oxidation shells, and the adjacent two sets of catalytic oxidation shells are connected through the connecting pipes at the top, and the bottom of the catalytic oxidation shells is provided with an air inlet and an exhaust port , the air inlet is connected with a backflow cleaning port, the middle part of the catalytic oxidation shell is provided with a heat storage ceramic layer, a catalyst layer and a heating layer, the heat storage ceramic layer is installed below the catalyst layer, and the waste gas The air inlet pipe is connected to the air inlet through the air inlet valve, the purified gas outlet pipe is connected to the exhaust port through the exhaust valve, and the cleaning pipeline is connected between the backflow cleaning port and the purified gas outlet pipe. The fan is set on the cleaning pipeline, and the number of catalytic oxidation shells on the catalytic oxidation box is not less than two. The regenerative VOCs catalytic oxidation device provided by the utility model connects multiple catalytic oxidation devices through connecting pipes, and has a compact structure.

The heat storage material in the utility model is one or a combination of saddle ring heat storage ceramics and honeycomb heat storage ceramics, and the catalyst in the catalyst layer is a honeycomb type noble metal catalyst, such as one or both of Pt and Pd. combination of those.

As an improvement of the utility model, the heating layer is an infrared heating tube, and the infrared heating tube is installed above the catalyst layer. The heating layer is a microwave magnetron, and the microwave magnetron is installed between the catalyst layer and the heat storage ceramic layer; the device is first heated by microwave auxiliary heating or infrared, and the heating speed is fast when it is started, the thermal efficiency is high, and the temperature control is convenient. Sensitive, small heating inertia.

As an improvement of the utility model, a cleaning valve is provided between the cleaning pipeline and the return cleaning port.

As an improvement of the utility model, manholes are provided on the connecting pipes at the top of each catalytic oxidation casing on the catalytic oxidation box; the manhole structure facilitates the operation and replacement of the catalyst layer, and at the same time facilitates the inspection of the internal parts of the device. maintain.

As an improvement of the utility model, the bottom of the catalytic oxidation housing is provided with an explosion relief valve and a sewage outlet, and each catalytic oxidation housing of the utility model is equipped with an explosion relief valve, which improves the safety of the device .

As an improvement of the present utility model, the inner surfaces of the catalytic oxidation shell and the connecting pipe are covered with a refractory material layer and a thermal insulation layer from the inside to the outside, and a temperature sensor is arranged between the refractory material layer and the thermal insulation layer.

As an improvement of the utility model, the intake valve, exhaust valve, cleaning valve, temperature sensor and heating layer are all connected to the PLC control system through lines.

The utility model has the advantage that any two catalytic oxidation devices of the regenerative VOCs catalytic oxidation device provided by the present invention and the connecting pipeline form a working unit, the organic waste gas enters from one catalytic oxidation device, and is catalyzed and oxidized by the other through the connecting pipeline. When a catalytic oxidation device is switched from the intake state to the idle state, a part of the purified gas is passed through the cleaning gas intake pipe to purge the catalytic oxidation device, and the organic waste gas remaining in the catalytic oxidation device is swept into the working unit by cleaning. degradation, which solves the problem of VOCs leakage when the catalytic oxidation device is switched.

The regenerative VOCs catalytic oxidation device provided by the utility model has high thermal efficiency, no additional heating is required after normal operation, and the operating cost is low: the regenerative VOCs catalytic oxidation device is equipped with a heat storage material, which can release VOCs during the catalytic oxidation process. The heat is stored and used to preheat the waste gas to be treated to reach a suitable oxidation temperature (about 300°C), and the oxidation reaction occurs under the action of the catalyst.

The device of the utility model adopts microwave or infrared heating, the heat penetration of the two heating methods is good, and the heat radiation range is wide; In the actual operation process, it only takes 15-25 minutes for the device to reach the temperature of purification operation, which greatly improves the working efficiency of the device itself.

Description of drawings

Fig. 1 is a schematic diagram of the device connection structure of the present utility model;

Fig. 2 is a schematic structural diagram of the infrared heating tube catalytic oxidation box of the present invention;

Fig. 3 is the structural diagram of microwave magnetron catalytic oxidation casing of the present utility model;

Fig. 4 is a schematic structural diagram of the catalytic oxidation housing of the present invention.

Among them, 1, the first-level catalytic oxidation shell; 2, the second-level catalytic oxidation shell; 3, the third-level catalytic oxidation shell; 1-1, the first-level intake valve; 1-2, the first-level outlet valve; 1- 3, primary cleaning valve; 2-1, secondary intake valve; 2-2, secondary outlet valve; 2-3, secondary cleaning valve; 3-1, tertiary intake valve; 3-2 , three-stage air outlet valve; 3-3, three-stage cleaning air valve; 4, fan; 5, connecting pipe; 6, sewage outlet; 7, explosion relief valve; 8, bolt; 9, manhole; 10, heating layer; 11, thermal insulation layer; 12, refractory material layer; 13, catalyst layer; 14, thermal storage ceramic layer; 15, air distribution grid; 16, air inlet; 17, return cleaning port; 18, exhaust port; 19, Exhaust gas inlet pipe; 20, purified gas outlet pipe; 21, cleaning pipeline.

detailed description

The utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Embodiment 1 : a kind of instantaneous RCO organic waste gas purifying device as shown in Figure 1, 2, 3 and 4, comprises catalytic oxidation casing, waste gas inlet pipe 19, purified gas outlet pipe 20, blower fan 4 and cleaning pipeline 21. The catalytic oxidation box is composed of multiple sets of catalytic oxidation shells 1, 2, and 3, and the adjacent two sets of catalytic oxidation shells 1 and 2 are connected through the connecting pipe 5 at the top. The bottom of the catalytic oxidation housing 1 or 2 or 3 is provided with an air inlet 16 and an exhaust port 18, the air inlet 16 is connected with a backflow cleaning port 17, the catalytic oxidation housing 1 or 2 or 3 The middle part is provided with a heat storage ceramic layer 14, a catalyst layer 13 and a heating layer 10, the heat storage ceramic layer 14 is installed below the catalyst layer 13, and the waste gas intake pipe 19 is connected to the air inlet 16 through an intake valve. The purified gas outlet pipe 20 is connected to the exhaust port 18 through an exhaust valve, the cleaning pipeline 21 is connected between the backflow cleaning port 17 and the purified gas outlet pipe 20, and the fan 4 is arranged in the cleaning On the pipeline 21, the number of catalytic oxidation shells 1 or 2 or 3 on the catalytic oxidation box is not less than two. The regenerative VOCs catalytic oxidation device provided by the utility model connects a plurality of catalytic oxidation casings 1 or 2 or 3 through a connecting pipe 5, and has a compact structure.

Embodiment 2 : as shown in Figure 2, 3 and 4, the thermal storage material in the utility model is a kind of or the combination in saddle ring thermal storage ceramics, honeycomb thermal storage ceramics, and the catalysis in the catalyst layer 13 is Honeycomb type noble metal catalyst, such as one of Pt, Pd or a combination of both.

Embodiment 3 : as shown in Figure 2, 3 and 4, the inner surface of catalytic oxidation housing 1 or 2 or 3 of the present utility model and connecting pipeline 5 is covered with refractory material layer 12 and insulation layer 11 from inside to outside, described A temperature sensor is arranged between the refractory material layer 12 and the thermal insulation layer 11 . The heating layer 10 is an infrared heating tube, and the infrared heating tube 10 is installed above the catalyst layer 13 . The heating layer 10 is a microwave magnetron, and the microwave magnetron 10 is installed between the catalyst layer 13 and the heat storage ceramic layer 14, and it is installed between the shell of the catalytic oxidation shell and the insulation layer 11. The device passes through Microwave auxiliary heating or infrared heating, fast heating up during start-up operation, high thermal efficiency, convenient and sensitive temperature control, and small heating inertia.

Embodiment 4 : As shown in Figures 2, 3 and 4, cleaning valves 1-3, 2-3 and 3-3 are provided between the cleaning pipeline 21 and the return cleaning port 17.

Embodiment 5 : as shown in Figure 2, 3 and 4, on the connecting pipe 5 on the top of each catalytic oxidation housing 1 or 2 or 3 on the catalytic oxidation casing, all are provided with manhole 9; Convenient operation by manhole structure 9 And replace the catalyst layer 13, and at the same time facilitate the maintenance of the inside of the device.

Embodiment 6 : as shown in Figure 2, 3 and 4, the bottom of catalytic oxidation housing 1 or 2 or 3 is provided with explosion relief valve 7 and blowdown outlet 6, all is installed on each catalytic oxidation housing of the present utility model The explosion relief valve 7 improves the safety of the device.

Embodiment 7 : as shown in Figure 2, 3 and 4, intake valve 1-1, 1-2 and 1-3, exhaust valve 1-2, 2-2 and 2-3, cleaning valve 1-3, 2-3 and 3-3, the temperature sensor and the heating layer 10 are all connected to the PLC control system through lines.

Embodiment 8 : the operation method of the utility model device as shown in Figure 1, 2 and 3 is as follows:

1) Open the valves 1-1 and 2-2 connecting the air inlet 16 of the first-stage catalytic oxidation shell 1 and the exhaust port 18 of the second-stage catalytic oxidation shell 2, and close the other valves. At this time, open the first-stage catalytic oxidation Oxidize the heating layer 10 of the housing 1, so that the reaction temperature in the catalytic oxidation housing 1 reaches the catalytic reaction temperature rapidly;

2) VOCs exhaust gas enters the first-stage catalytic oxidation shell 1 and is catalyzed and oxidized in the catalyst layer 13, and then enters the second-stage catalytic oxidation shell 2 through the connecting pipe 5, and continues in the catalyst layer 13 of the second-stage catalytic oxidation shell 2 Catalytic oxidation degradation, the heat released during the catalytic oxidation process is absorbed by the heat storage layer 14, preheating the heat storage layer 14 in the secondary catalytic oxidation shell 2, and the purified gas is exhausted from the secondary catalytic oxidation shell 2 Port 18 is discharged into the purified gas outlet pipe 20;

3) When the temperature of the heat storage layer 14 of the secondary catalytic oxidation shell 2 reaches 350~400°C, close the connection between the air inlet 16 of the primary catalytic oxidation shell 1 and the exhaust port 18 of the secondary catalytic oxidation shell 2 Valves 1-1 and 2-2, open the valves 2-1 and 3-2 connected to the air inlet 1-2 of the second-stage catalytic oxidation housing 2 and the exhaust port 18 of the third-stage catalytic oxidation housing 3 and the first-stage The valve 1-3 connected to the cleaning gas inlet 17 of the catalytic oxidation housing 1;

4) The exhaust gas enters the secondary catalytic oxidation shell 2, exchanges heat with the heat storage layer 14 in it, and the temperature reaches 250°C. After the catalyst layer 13 undergoes catalytic oxidation, it enters the third-stage catalytic oxidation shell 3 through the connecting pipe 5, and then Catalytic oxidation is carried out, and the released heat preheats the heat storage layer 14 in 3, and the purified gas flows out through the exhaust port 18 of the three-stage catalytic oxidation shell 3, and at the same time, the cleaning gas enters the first-stage catalytic oxidation shell 1. The cleaning gas and the waste gas to be treated remaining in the first-stage catalytic oxidation casing 1 enter the third-stage catalytic oxidation casing 1 through the connecting pipe 5. discharge.

When the regenerative VOCs catalytic oxidation device contains four or more catalytic oxidation devices, its use method is the same as the above-mentioned use method.

In a working cycle of the above-mentioned device, the microwave auxiliary heating is mainly reflected in the heating up to the reaction temperature when the device starts to process waste gas, and the lack of temperature auxiliary heating during the operation of the device. The waste heat generated by the device's normal catalytic oxidation of organic waste gas is exchanged through the heat storage layer, which can meet the temperature requirements of the device's self-circulating catalytic reaction without additional energy consumption.

Embodiment 8 : as shown in Figure 1, 2, 3 and 4, utilize the thermal storage type VOCs catalytic oxidation device described in embodiment 1 and 8 to degrade VOCs, the organic matter contained in the VOCs comprises benzene, toluene, xylene, diiso Propylamine, ethyl formate, tetrahydrofuran, ethanol, isobutyl isobutyrate, styrene, 1,3-bromochloropropane, methylene chloride and methanol; the concentration of organic pollutants in VOCs is 1000mg/m ³ ~5000mg/m ³ . The processing flow is as follows:

The VOCs of water washing and alkaline washing pretreatment enter the regenerative VOCs catalytic oxidation device described in catalytic oxidation embodiment 1, and its operation process is the same as the operation mode described in embodiment 1. During the operation, the casing of the catalytic oxidation device The lowest temperature is 350°C and the highest is 550°C. Organic pollutants are oxidized into harmless small molecules such as carbon dioxide and water in the catalytic oxidation device, and the purified gas is emptied through the purified gas outlet pipe.

In the process of processing, the inlet of the primary intake valve 1-1 of the catalytic oxidation unit, the interior of the primary outlet valve 1-2, the inlet of the secondary intake valve 2-1, the outlet of the secondary outlet valve 2-2, and the intake of the third stage The gas inside the valve 3-1 and the gas at the outlet of the third-stage gas outlet valve are tested for the content of organic pollutants, and the results are shown in the table below.

Catalytic combustion (RCO) treatment rate = (organic pollutant inlet concentration - organic pollutant outlet concentration) / organic pollutant inlet concentration in a working unit; catalytic combustion (RCO) treatment rate for this catalytic oxidation process The maximum degradation rate in .

It can be seen from Table 1 that the regenerative VOCs catalytic oxidation device provided in Example 1 can effectively degrade organic pollutants in organic waste gas.

It should be noted that the above are only preferred embodiments of the present utility model, and are not used to limit the protection scope of the present utility model. Any combination or equivalent transformation made on the basis of the above-mentioned embodiments belongs to the scope of the present utility model. protected range.

Claims (8)

1. null1. an Instant heating type RCO cleaning equipment for waste organic gas，Including catalysis oxidation casing、Exhaust inlet pipe、Purify gas escape pipe、Blower fan and cleaning pipeline，It is characterized in that，Described catalysis oxidation casing is made up of many group catalysis oxidation housings，It is connected by the connection pipeline at its top between two groups of adjacent catalysis oxidation housings，The bottom of described catalysis oxidation housing is provided with air inlet and air vent，Connect on described air inlet and have backflow cleanout，The middle part of described catalysis oxidation housing is provided with thermal storage ceramic layer、Catalyst layer and zone of heating，Described thermal storage ceramic layer is arranged on the lower section of catalyst layer，Described exhaust inlet pipe is connected on air inlet by intake valve，Described purification gas escape pipe is connected on air vent by air bleeding valve，Described cleaning pipeline is connected to reflux between cleanout and purification gas escape pipe，Described blower fan is arranged on cleaning pipeline，On described catalysis oxidation casing, the quantity of catalysis oxidation housing is no less than two.
2. Instant heating type RCO cleaning equipment for waste organic gas the most according to claim 1, it is characterised in that described zone of heating is infrared heating pipe, infrared heating pipe is arranged on the top of catalyst layer.
3. Instant heating type RCO cleaning equipment for waste organic gas the most according to claim 1, it is characterised in that described zone of heating is microwave magnetron, microwave magnetron is arranged between catalyst layer and thermal storage ceramic layer.
4. Instant heating type RCO cleaning equipment for waste organic gas the most according to claim 1, it is characterised in that be provided with cleaning valve between described cleaning pipeline and backflow cleanout.
5. Instant heating type RCO cleaning equipment for waste organic gas the most according to claim 1, it is characterised in that be equipped with manhole on the connection pipeline at the top of each catalysis oxidation housing on described catalysis oxidation casing.
6. Instant heating type RCO cleaning equipment for waste organic gas the most according to claim 1, it is characterised in that the bottom of described catalysis oxidation housing is provided with explosion venting valve and sewage draining exit.
7. Instant heating type RCO cleaning equipment for waste organic gas the most according to claim 1, it is characterized in that, described catalysis oxidation housing and the inner surface of connection pipeline are coated with refractory masses and heat-insulation layer from inside to outside, are provided with temperature sensor between described refractory masses and heat-insulation layer.
8. 8. according to the Instant heating type RCO cleaning equipment for waste organic gas described in claim 1 or 2 or 3 or 4 or 5 or 6 or 7, it is characterised in that described intake valve, air bleeding valve, cleaning valve, temperature sensor and zone of heating all by connection in PLC control system.