Waste gas treatment device for explosion-proof diesel engine

Abstract

The invention relates to the field of waste gas treatment of a diesel engine, and particularly relates to a waste gas treatment device for an explosion-proof diesel engine. The waste gas treatment device for the explosion-proof diesel engine comprises a waste gas solid particle treatment pipe, a harmful gas treatment pipe and a waste gas cooling pipe, wherein an oxidation catalyst device and a particulate filter are arranged inside an inner cavity of the waste gas solid particle treatment pipe; a selective catalyst reducer is arranged inside the inner cavity of the harmful gas treatment pipe. Solid particles of waste gas are processed by using the particulate filter; the regeneration of the particulate filter is assisted by using the oxidization catalyst device; the content of nitric oxide in the waste gas is reduced by using the selective catalyst reducer; the waste gas is cooled through the cooling pipe. The device is simple and practical in structure, and easy to popularize.

Description

technical field [0001] The invention relates to an exhaust gas treatment device, in particular to an exhaust gas treatment device for an explosion-proof diesel engine. Background technique [0002] Explosion-proof diesel engines are mainly for diesel engines used in the environment of flammable and explosive gases or solid dust particles. "MT 990-2006 General Technical Conditions for Mining Explosion-proof Diesel Engines" stipulates that in the undiluted exhaust of explosion-proof diesel engines, the volume concentrations of the harmful gas components carbon monoxide (CO) and nitrogen oxides (NOx) should not exceed 0.1% respectively and 0.08%; the exhaust temperature of the explosion-proof diesel engine should not exceed 70°C; the surface temperature of the explosion-proof diesel engine should not exceed 150°C. Although the regulations only give quantitative standards for CO and NOx, currently users also have requirements for the emission of solid particles (PM), so ...

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Problems solved by technology

Oxidation catalysis (DOC) is mostly a flow-through catalytic converter with a ceramic carrier. This device is mainly to reduce flammable gases and soluble organic components in the exhaust gas, but the main problems of oxidation catalysis (DOC) are high temperature aging and catalyst poisoning. In addition, excessive sulfur content in the fuel will also cause the oxidation catalyst (DOC) to fail; Selective Catalytic Reduction (SCR) uses ammonia (NH3) as the reducing agent, and under the action of the catalyst, the nitrogen in the exhaust gas of the diesel engine Oxide (NOx) is converted into harmless ammonia and water vapor, but ammonia leakage, transportation and supply issues have always been the limiting factors for the promotion of selective catalytic reduction (SCR); adsorption reduction (LNT) is based on periodic engine The method of purifying nitrogen oxides (NOx) with lean-burn and rich-burn operations has the disadvantages of weak anti-sulfur aging performance and the need for low-sulfur fuel oil, while the adsorption reduction (LNT) catalyst requires periodic desulfurization treatment

The particle filter (DPF) separates fine particles (PM) from the air flow by means of inertial collision, interception, diffusion and gravity sedimentation, but the filtered particles gradually block the filter holes due to accumulation, increasing the exhaust resistance, resulting in The power and economy of diesel engines are deteriorating; the washing box is the mainstream use form of explosion-proof diesel engines at present. Its advantages include effectively depositing carbon particles, dissolving and diluting hydrocarbons, aldehydes, carbides and other pungent gases Exhaust gas temperature, but its complex structure, large space occupation, and short coolant supply cycle limit its popular use in explosion-proof diesel engines; the use of jet-type smoke diluters in mining scrapers has been mentioned in domestic literature, but there is no discussion specific implementation rules

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