Isothermal constant-speed sampling device of fly ash

Abstract

The invention discloses an isothermal constant-speed sampling device of fly ash. A sampling head is arranged at the front end of a sampling gun; the sampling gun is arranged inside a flue; the tail part of the sampling gun is connected with a cyclone separator through a second heat-resisting metal hose; a first heat-resisting metal hose is sleeved outside the sampling gun and the second heat-resisting metal hose; one end of the first heat-resisting metal hose is communicated with the flue; the other end of the first heat-resisting metal hose is connected with an air extractor through a dust remover; a ball valve is connected to the lower end of the cyclone separator; the top part is connected with the filter; the filter is connected to a flow meter; the flow meter is connected with the air extractor; a heater is arranged outside the filter and the cyclone separator; one end of a first thermocouple is connected with a temperature transmitter; the temperature transmitter is connected with a temperature control system through a signal wire; one end of a second thermocouple is arranged inside the cyclone separator; and the other end of the second thermocouple is connected with the temperature transmitter. The heat-resisting efficient filter for isothermally sampling obtains actual particle size distribution of the fly ash in the smoke. The content of pollutants such as heavy metal in the fly ash of a sampling point is accurately reflected by the sampling device.

Description

technical field [0001] The invention relates to a detection device for a boiler and an incinerator, in particular to an isothermal and constant-velocity sampling device for fly ash in the combustion system and the dust removal system of the boiler and the incinerator. Background technique [0002] Coal-fired fly ash contains some pollutants such as heavy metals, but the content of heavy metals and other pollutants in fly ash produced during the incineration of garbage, sludge or other solid waste may be higher, which is also worthy of attention. The heavy metals and their compounds contained in coal and solid waste will be evaporated into the flue gas during the combustion / incineration process, and the flue gas enters the tail flue of the boiler or incinerator from the furnace with a relatively high temperature (800 ° C ~ 1100 ° C). During the cooling process, heavy metals in the flue gas form discrete metal particle aerosols or undergo uniform nucleation and heterogeneous d...

AI Technical Summary

Problems solved by technology

[0007] So far, there is no one that can control the temperature of the flue gas in the sampling device to be consistent with the temperature of the sampling point during the sampling process, ensure that the flow rate of the flue gas entering the sampling gun is equal to the flow rate of the surrounding flue gas, and collect fine fly ash in the flue gas. Particle Sampling Device

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