CN210180987U

CN210180987U - Catalyst activity evaluation device for catalytic degradation of dioxin

Info

Publication number: CN210180987U
Application number: CN201920389023.4U
Authority: CN
Inventors: Shouxiang Sheng; 盛守祥; Hengfei Chen; 陈恒飞; Hao Wu; 吴昊; Haisheng Liu; 刘海生; Weilong Rong; 荣卫龙; Deqing Ma; 马德庆; Jianguang Sun; 孙建光
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-27
Filing date: 2019-03-27
Publication date: 2020-03-24
Anticipated expiration: 2029-03-27

Abstract

The utility model provides a catalytic degradation dioxin's catalyst activity evaluation device, include by evaporation unit, catalytic unit, sample unit, tail gas processing unit and constitute, substitute the index thing by HCB as the dioxin, react with the catalyst, there is corresponding relation between HCB's catalytic degradation efficiency A and the catalytic degradation effect B of dioxin, and B = A95%, the device simple structure, and use the lower HCB of toxicity to replace the higher dioxin of toxicity, can effectual protection experimenter's safety.

Description

Catalyst activity evaluation device for catalytic degradation of dioxin

Technical Field

The utility model belongs to catalyst evaluation field, especially an evaluation device to catalyst of catalytic degradation dioxin.

Background

The traditional process for removing the dioxin in the flue gas is to remove the dioxin through a cloth bag and an activated carbon adsorption process, but the process only converts the dioxin in the flue gas into solid fly ash and does not eliminate the dioxin. The catalytic degradation process thus produced, in V₂O₅/WO₃-TiO₂、V₂O₅/MoO₃-TiO₂The catalysts can degrade dioxin in the flue gas, the dioxin is thoroughly oxidized in the catalytic reaction process, and the final product is H₂O、CO₂And HCl. The technology is gradually applied industrially as a new technology for catalyzing and degrading dioxin.

Dioxin is a persistent organic pollutant, the concentration of the dioxin in flue gas is low, and the emission value of the dioxin concentration in the flue gas generated by burning various fields such as garbage burning, dangerous waste burning, sintering flue gas and the like in China at present has emission limit value requirements. Because the requirement for collecting the sample of the dioxin is high, and the laboratory analysis flow of the dioxin is complex and the period is long, a large amount of manpower, material resources and financial resources are consumed for analyzing the sample of the dioxin. Because of the high toxicity and difficult volatility of dioxin, a catalytic degradation experiment is not directly carried out by adopting dioxin-containing gas or dioxin standard gas at the current pilot plant stage. If the efficiency of the catalyst for degrading dioxin is evaluated in a pilot plant or industrial application stage, a large amount of labor and material cost is spent, and the development of catalysis is not facilitated.

If the degradation effect of the catalyst on dioxin can be evaluated in a small test, the formula of the catalyst can be adjusted in time, and the method is the research target of people at present. And a substitute with lower toxicity is adopted to simulate the degradation efficiency of the target catalyst on the dioxin in a pilot plant, so that the method and the technical trend for evaluating the degradation activity of the target catalyst on the dioxin are provided.

Disclosure of Invention

The utility model provides a catalyst activity evaluation device of catalytic degradation dioxin, the device can be used for evaluating the degradation efficiency of catalyst to dioxin.

For realizing the purpose of the utility model, the following technical proposal is adopted:

a catalytic activity evaluation device for catalytic degradation of dioxin comprises: the device comprises an evaporation unit, a catalytic unit, a sample unit and a tail gas treatment unit.

(1) The evaporation unit comprises a gas generator 1, a standard sample 2, a heater 3, a carrier gas 4 and a gas mixer 5.

In the step (1), the HCB standard sample is contained in the standard sample 2, the temperature of the gas generator 1 is controlled by the heater 3, and the HCB standard sample is gasified under a specific temperature condition in the gas generator 1 to form HCB gas;

in the above (1), N is contained in the carrier gas 4₂Bottle and O₂Gas cylinder, N₂And O₂Mixed in a mixer 5, and then enters a catalytic unit together with HCB gas to control N₂And 0₂The amount of production and flow rate are adjusted to adjust the HCB gas concentration and flow rate.

(2) The catalytic unit comprises a catalytic reactor 6 and a temperature controller 7.

The catalyst to be evaluated was contained in the catalytic reactor 6 in the above (2);

HCB gas generated in the middle of the above (1) to be in N₂And O₂Under the protection of (3), the reaction product enters a catalytic reactor 6 to react with a catalyst to be evaluated;

the temperature in the catalytic reactor 6 in (2) above is controlled by the temperature controller 7, and the optimum temperature condition for the reaction of the HCB gas and the catalyst to be evaluated is continuously tested.

(3) The sample unit comprises an adsorption device 8.

After the catalytic reaction in (2) above, unreacted HCB gas was adsorbed by XAD2 resin in the adsorption apparatus 8, and the content of HCB adsorbed in the XAD2 resin was experimentally analyzed to calculate the catalytic degradation efficiency a of HCB.

(4) The tail gas purification unit comprises a primary filter (9) and a secondary filter (10).

The tail gas purification unit in the above (4) is used for treating the residual gas in the above (3), and the purified gas is directly discharged after the n-hexane and the activated carbon which pass through the primary filter 9 and the secondary filter 10 are saturated, and the n-hexane and the activated carbon which adsorb the residual gas are treated as dangerous substances.

A large number of experiments prove that the catalytic degradation efficiency A of HCB and the catalytic degradation effect B of dioxin have a corresponding relation, and B = A × 95%. The catalyst activity evaluation device can analyze and evaluate the catalytic degradation effect of the catalyst on dioxin without the need of contacting the dioxin, which is a highly toxic article, by experimenters, and has the advantages of simple device and easy operation.

Drawings

Fig. 1 is a schematic structural diagram of a device for evaluating activity of a catalyst for catalytic degradation of dioxin according to the present embodiment.

Detailed Description

(1) Putting a certain amount of HCB standard sample into a gas generator 1, controlling the temperature of a heater 3, under the corresponding temperature condition, gasifying the HCB standard sample in the gas generator 1 after gas-solid phase distribution balance, and carrying N in a carrier gas 4₂And O₂In cooperation, the concentration and flow rate of HCB in the gas is controlled into the catalytic generator 6.

(2) N in the carrier gas 4 in the above (1)₂And O₂The gas flow of (2) was controlled at 300 ml/min.

(3) The size of the catalytic generator 6 in the step (1) is 20 x 300mm, the catalytic generator is composed of a quartz tube, and the temperature controller is composed of a heating belt and a heating furnace; catalyst particles to be evaluated and quartz wool are placed in the catalytic generator 6 to form a catalyst bed layer. The temperature controller 7 controls the temperature of the catalytic generator 6 to be 80-400 ℃.

(4) After the HCB gas and the catalyst to be evaluated are subjected to the catalytic degradation reaction in the above step (3), the HCB gas which is not degraded enters the adsorption device 8, is adsorbed by the XAD2 resin placed in the adsorption device 8, the XAD2 resin is carried into a laboratory to analyze the HCB content, and the catalytic degradation efficiency a of the HCB is calculated.

(5) The gases generated in the above (1) to (4) are not adsorbed and reacted, and finally discharged after being purified by n-hexane and activated carbon adsorption and filtration in the first filter 9 and the second filter 10.

(6) The catalytic degradation efficiency a of HCB and the catalytic degradation effect B of dioxin are correlated, and B = a × 95%.

By controlling N in the carrier gas 4₂And O₂The HCB concentration in the gas before entering the catalytic generator 6 is 20ppm, the gas flow rate is 5000h < -1 >, 200mg of the catalyst to be evaluated is put into the catalytic generator 6, and the whole reaction duration is 8 h. A =97% was measured, and according to B = a × 95%, the catalytic degradation efficiency B =92% for dioxin was found for this catalyst.

Claims

1. A catalytic activity evaluation device for catalytic degradation of dioxin is characterized by comprising: the device comprises an evaporation unit, a catalytic unit, a sample unit and a tail gas purification unit;

the evaporation unit comprises a gas generator (1), a standard sample (2), a heater (3), a carrier gas (4) and a gas mixer (5);

the catalytic unit comprises a catalytic reactor (6) and a temperature controller (7);

the sample unit comprises an adsorption device (8);

the tail gas purification unit comprises a primary filter (9) and a secondary filter (10).

2. The apparatus for evaluating the activity of a catalyst for catalytic degradation of dioxin according to claim 1, characterized in that the standard sample (2) is HCB standard sample.

3. The apparatus for evaluating the activity of a catalyst for catalytic degradation of dioxin according to claim 1, wherein n-hexane is placed in the primary filter (9) and activated carbon is placed in the secondary filter (10).