Mini-type test evaluation device for integral SCR denitration catalyst reaction performance test and application method thereof

Abstract

The invention relates to a mini-type test evaluation device for integral SCR denitration catalyst reaction performance test and an application method thereof, and belongs to the technical field of catalysis. A flow control instrument and a temperature control instrument control the temperature of a reaction gas sample introduction control device and a heating furnace of a preheating-reacting device; all component gases and water vapor passing through the reaction gas sample introduction control device are converged into a gas mixing device; simulated flue gas getting out of the gas mixing device enters a gas preheating pipe of the preheating-reacting device, the simulated glue gas getting out of the gas preheating pipe enters a catalyst filling pipe of the preheating-reacting device and passes through a catalyst bed layer; the gas passing through the inlet of the gas preheating pipe of the preheating-reacting device and the gas passing through the outlet of the catalyst filling pipe are led into a flue gas composition analyzing system through a sampler. The operation temperature of the device is high, and the measured activity of the catalyst is relatively low but closer to the real value; the barrier in the heat transmitting process and the thermal loss in the process are reduced, and energy saving is facilitated; the time for achieving balance of the device is shortened.

Description

technical field [0001] The invention relates to a catalyst reaction performance evaluation device, in particular to a micro-test evaluation device for testing the reaction performance of an integral SCR denitrification catalyst and a use method thereof, belonging to the technical field of catalysis. Background technique [0002] Nitrogen oxides (NOx) are the main substances that form acid rain, photochemical smog, and smog, and are harmful to human health. Coal-fired and gas-fired boilers in thermal power plants are the main source of NOx emissions. In the "Emission Standards for Air Pollution from Thermal Power Plants" (GB13223-2011) released in 2011, the NOx emission limit was changed from 450mg / m 3 down to 100mg / m 3 , NOx control is imperative. According to the current standard, the selective catalytic reduction method (Selective Catalytic Reduction, SCR) is the most common and effective method for removing nitrogen oxides in boiler tail gas, and is widely used in var...

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Problems solved by technology

[0007] Based on the above characteristics, the current general-purpose microreactor catalyst performance testing device has the following disadvantages: (1) Since the reactor is made of stainless steel, the visibility is poor, and it is difficult to take and place the test sample in the reactor, requiring operators to have strong Experience; (2) Since the reactor and preheater are made of stainless steel, the stainless steel material will have a catalytic effect on the reaction simulated flue gas under the reaction conditions, which cannot truly reflect the reactivity of the catalyst, and the test activity is relatively high; (3) Due to the fact that the stainless steel When the temperature of the material is higher than 500 degrees Celsius, there will be obvious migration of metal atoms. After the current general-purpose micro-reaction performance test device is tested under high temperature conditions, the connecting screws of the stainless steel reactor will have thread bonding, resulting in the reaction of the reactor. Scrapped; (4) Since the stainless steel material will react with sulfur dioxide under high temperature and humidity conditions, the preheater and reactor of the current general-purpose microreactor catalyst performance test device are severely corroded, so sulfur dioxide is usually not introduced when testing the reaction performance of the catalyst , which will lead to a deviation between the catalyst test activity and the actual working condition; (5) There are two heat transfer obstacles in the water vapor evaporation device: the inner wall of the heating furnace-the outer wall of the evaporator, and the inner wall of the evaporator-the evaporation medium. In order to obtain the rated amount of water vapor, the heating The temperature of the furnace is usually set at 600 degrees Celsius, which requires a lot of energy consumption; (6) The flue gas preheating device is separated from the reactor, and the pipeline connection between them still has heat loss even if there is a good insulation layer

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