Sampling device and sampling method for pumping gas sample in self-negative-pressure pipeline

Abstract

The invention relates to a sampling device and a sampling method for pumping a gas sample in a self-negative-pressure pipeline, which can be widely applied to a sampling step of checking front coal gas of draught fans of steel, coking and chemical industries. According to the sampling device, a coal gas pipeline is externally connected with a first gas conveying pipe and one end of the first gas conveying pipe is inserted into a liquid level in an absorption liquid bottle; a water injection pipe and a gas inlet pipe are arranged at the top of a sealed water tank; one end of a second gas conveying pipe is guided out from the top of the absorption liquid bottle and is connected onto the gas inlet pipe; a water discharging pipe is arranged at the bottom of the sealed water tank; the first gas conveying pipe, the second gas conveying pipe, the water injection pipe and a water discharging pipe are provided with valves respectively; a measuring cylinder with scales is arranged below the water discharging pipe. The invention introduces the sampling method based on the device. The invention explores a new way for a negative-pressure sampling manner of the coal gas so as to effectively avoid inaccurate measurement of a sampling volume and avoid mixing air. The accuracy of the negative-pressure sampling of the coal gas is guaranteed.

Description

technical field [0001] The invention provides a gas sampling point which can be widely used in the steel, coking and chemical industries, where the gas pipeline pressure is less than or equal to the atmospheric pressure. Background technique [0002] In the coking industry, it is necessary to sample the gas samples in the gas pipeline in order to detect the hydrogen sulfide content in the gas. The sampling point is generally located in front of the blower, and the pressure of the gas pipeline in front of the blower is generally negative pressure (about negative 5KPa) , At this stage, most of the samples are taken by negative pressure pumps. The negative pressure pump pumps out the gas by rotating, and needs to cooperate with the gas flow meter to calculate the volume of the gas pumped out. [0003] In actual use, due to the low pressure and low suction force of the portable negative pressure sampling pump, the flow rate of the sample drawn is unstable, resulting in the fact...

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Problems solved by technology

[0003]In actual use, due to the low pressure and low suction force of the portable negative pressure sampling pump, the flow rate of the sample drawn is unstable, and objectively, the gas flowmeter has been unable to Accurate counting directly affects the test results of the hydrogen sulfide content in the gas, and the data deviation is large, which does not meet the actual production

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