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Correction method for multi-point measurement of steam drum liquid level of high pressure boiler

A steam drum liquid level and multi-point measurement technology, which is applied in the direction of liquid/fluid solid measurement, measuring devices, liquid level indicators, etc., can solve the problem of affecting the control of the steam drum liquid level, large deviation of liquid level measurement, and inability to guarantee Problems such as the accuracy and consistency of multi-point liquid level measurement values, to achieve the effect of eliminating system errors, solving difficulties in accuracy and consistency, and ensuring consistency

Inactive Publication Date: 2011-07-06
TIANJI COAL CHEM IND GROUP
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Problems solved by technology

[0004] When using multi-point monitoring of the liquid level on the steam drum, due to the different structure and installation position of the measuring device, and the measurement medium water and steam are in a state of high temperature and high pressure, they are greatly affected by temperature and pressure, resulting in relatively large deviations in liquid level measurement. Large, can not guarantee the accuracy and consistency of multi-point liquid level measurement, which seriously affects the control of the drum liquid level

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  • Correction method for multi-point measurement of steam drum liquid level of high pressure boiler
  • Correction method for multi-point measurement of steam drum liquid level of high pressure boiler

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[0022] Due to installation reasons, the h of each pressure taking device 1 and h 2 It's all different. refer to figure 1 Measure and record the installation position of the liquid level measuring device 2, after measurement, the height h between the two connecting ports of the liquid level measuring device 2 and the steam drum 1 1 =700mm, the height h between the liquid level measuring device 2 and the lower connection port of the steam drum 1 to the differential pressure transmitter 3 2 =250mm.

[0023] According to the working conditions, determine the saturated water density ρ in the steam drum 1 液 =675.3kg / m 3 , saturated steam density ρ 汽 =60.94kg / m 3 , and the condensate density ρ in the liquid level measuring device 2 冷 =915.8kg / m 3 ; The pressure P in the steam drum 1 and the liquid level measuring device 2 1 = 11.0 MPa.

[0024] Calculate the range ΔP and migration P of the differential pressure transmitter 3 of the liquid level measuring device 2:

[0025...

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Abstract

The invention discloses a correction method for multi-point measurement of a steam drum liquid level of a high pressure boiler. The method comprises the following steps of: calculating a range and migration of a differential pressure transmitter according to height between a liquid level measurement device and two connecting ports of a steam drum, height from the liquid level measurement device and the lower connecting port of the steam drum to the differential pressure transmitter, saturated water density and saturated steam density in the steam drum and condensate density in the liquid level measurement device; inputting the range and the migration to the differential pressure transmitter to serve as an original zero point and an original range; actually measuring a thermal-state zero value PA and a thermal-state range value PR of the differential pressure transmitter; calculating effective measuring ranges in PA and PR; establishing polygonal function relation; corresponding an effective thermal-state zero value Pr and an effective thermal-state range value Pr to a zero value La and a range value Lr of liquid level indication respectively; displaying according to linear relation; and performing temperature and pressure compensation calculation on La, Lr, steam drum temperature Tsteam and steam drum pressure Psteam to acquire a corrected value of the steam drum liquid level Ldelta so as to play a role in three-impulse adjustment and interlocking control of the steam drum liquid level.

Description

technical field [0001] The invention belongs to the technical field of liquid level measurement, and relates to a liquid level measurement correction method, in particular to a high pressure boiler steam drum liquid level multi-point correction method. Background technique [0002] Coal chemical production is inseparable from high-temperature and high-pressure boilers. Due to the complexity of the coal chemical process, the steam load demand for high-temperature and high-pressure boilers changes frequently, resulting in the phenomenon of "false liquid level" in high-temperature and high-pressure boilers from time to time. [0003] In order to ensure the safe operation of the boiler and steam drum, in the steam drum liquid level control scheme, more than three steam drum liquid level detection points are usually set up to meet the requirements of three-impulse liquid level adjustment and three-take-two liquid level interlock protection . [0004] When using multi-point monit...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/00
Inventor 万法臣刘金亮李录彦李剑川师润平秦诚孝
Owner TIANJI COAL CHEM IND GROUP
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