Continuous monitoring and sampling system for flue gas emission

Abstract

The invention relates to a continuous monitoring and sampling system for flue gas emission. A plurality of flue gas sampling branch pipes are uniformly arranged on the side wall of the chimney; one ends of the flue gas sampling branch pipes extend into the chimney; the other ends of the flue gas sampling branch pipes penetratesthrough the top surface of the mixing tank and extend to the lower partof the mixing tank; a mixed gas outlet is formed in the top surface of the mixing tank; the mixed gas outlet is connected with one end of a mixed gas pipe; the other end of the mixed gas pipe is connected with a sampling tank gas inlet in the top surface of the sampling tank; a flue gas discharge port is formed in the bottom of the sampling tank, a sampling port is formed in the side surface of the sampling tank, the sampling port is connected with an inlet of an air exhaust sampling pump, an outlet of the air exhaust sampling pump is connected with a flue gas analyzer, the flue gas dischargeport is connected with an inlet of an air intake pump, and an outlet of the air intake pump is connected with a downstream discharge port of a chimney. Multi-point sampling is achieved, multi-point sampling is guaranteed, and meanwhile the problems that due to the fact that branch pipelines are switched back and forth in the multi-point sampling process, the total sampling time is too long, and the detection result does not conform to the overall situation in a flue can be solved.

Description

technical field [0001] The invention belongs to the technical field of engineering measurement and relates to a flue gas sampling method, in particular to a flue gas emission continuous monitoring and sampling system. Background technique [0002] As my country's emphasis on environmental protection and related industries has gradually increased, the unit concentration and total amount of pollutant emissions have also been greatly reduced, and the requirements for continuous monitoring capabilities and technical levels of environmental protection and emission reduction equipment are also getting higher and higher. In the flue where the flue gas is continuously discharged, the concentration of pollutants is not uniform, and the flue gas sampling method in my country is still based on the single-point sampling method in accordance with GB / T16157-1996 "Determination of Particulate Matter in Exhaust from Stationary Pollution Sources and Sampling of Gaseous Pollutants". Sampling i...

AI Technical Summary

Problems solved by technology

[0005] The problem with this patent is that the patent is single-point sampling. In the flue where the flue gas is continuously discharged, the concentration of pollutants is not uniform. The single-point sampling is affected by the sampling position, and the sampling results have great limitations and Uncertainty

[0007] The problem of this patent is: ①Although the patent has a grid layout, the branch pipes directly enter the flue gas analyzer after they merge, which cannot ensure that the mixing of each branch is uniform, which makes the detection structure deviate greatly from the real value ;②This patent does not set up a thermal insulation and heat tracing system. Since the tail flue is basically saturated wet flue gas, the extracted flue gas will have a large amount of condensed water after the flue gas is mixed due to the temperature drop, resulting in SO2 and other easily soluble in water. The concentration of pollutants is distorted, and the error of the detection result is large

Images