SCR denitrification system multi-branch flue gas sampling device and sampling method

Abstract

The invention discloses an SCR denitration system multi-branch smoke gas sampling device and method. The device comprises a smoke gas analyzer, a plurality of smoke gas sampling pipes, sampled smoke gas channels, a three-way plug valve, a small header and a large header. The multiple smoke gas sampling pipes form a multi-branch smoke gas sampling pipeline. Each smoke gas sampling pipe is connected with the corresponding branch smoke gas channel. The branch smoke gas channels are connected with the small header and the large header through valves and middle pipelines. The small header is connected with a small-flow sucking pump. The small-flow sucking pump is connected with the smoke gas analyzer. The large header is connected with a large-flow sucking pump. The three-way plug valve, the large header, the small header and the middle pipelines are integrated into a portable switching device box. According to the SCR denitration system multi-branch smoke gas sampling device and method, frequent connection and disconnection of the smoke gas channels, the sucking pumps and the smoke gas analyzer in the multi-branch smoke gas analyzing working process are avoided, and a large amount of manpower and time is saved; the smoke gas sampling process is simplified, and the working efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of SCR denitrification equipment, in particular to a multi-branch flue gas sampling device and sampling method of an SCR denitrification system. Background technique [0002] SCR (Selective Catalytic Reduction) is the mainstream method in the existing denitrification technology of coal-fired boilers in power stations. In the prior art, during the optimization test and performance test of the SCR system, it is necessary to manually measure the distribution field of flue gas nitrogen oxides (NOx) on the cross section of the SCR reactor. Since the cross-sectional area of ​​the SCR reactor is usually greater than 100m 2 , in order to obtain the flue gas distribution field, 60-100 flue gas sampling tubes need to be arranged in a matrix in the SCR flue section. In actual work, since flue gas analyzers are expensive instruments, it is impossible to connect each flue gas sampling pipe to a flue gas analyzer. Gas ...

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Problems solved by technology

In this process, it is necessary to repeatedly connect and disconnect each branch flue gas channel with the flue gas analyzer, which consumes a lot of time and manpower

And every time it is connected to a branch flue gas sampling pipe for analysis, it is often necessary to suck the flue gas from the measuring point in the SCR flue to the flue gas analyzer through a transmission pipeline that is tens of meters long. It takes several minutes to wait for the measurement point, so 60-100 sampling measurement points will take several hours in total, and the work efficiency will be greatly reduced

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