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Optimal energy-saving method for controlling surface pollutant discharge of steam boiler

A technology for surface sewage discharge and energy-saving control, which is applied in control systems, steam generation, boiler cleaning devices, etc., and can solve problems such as non-pollution control schemes and excessive emissions

Inactive Publication Date: 2011-06-01
西安交大思源科技股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this intermittent automatic sewage discharge method is improved compared with manual timed sewage discharge, the salt content always fluctuates between high and low limits, and there is still a certain amount of excessive discharge, which is not an optimal pollution control scheme.

Method used

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  • Optimal energy-saving method for controlling surface pollutant discharge of steam boiler
  • Optimal energy-saving method for controlling surface pollutant discharge of steam boiler
  • Optimal energy-saving method for controlling surface pollutant discharge of steam boiler

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specific Embodiment approach

[0017] The present invention is described in further detail below in conjunction with accompanying drawing:

[0018] The composition of the surface pollution discharge optimization energy-saving control system proposed by the present invention is as follows: figure 1 shown. The steam flow signal measured by the flowmeter installed on the steam pipe of the boiler is multiplied by the proportional coefficient according to the formula (1) in the proportional setter to obtain the theoretically calculated initial value of the blowdown flow. Temporarily assume that the other input signal is 0) output the command signal of the blowdown flow, compare the command signal with the actual flow measured by the blowdown flowmeter, if there is any difference, the controller B will push the actuator to change the blowdown valve opening Degree, the blowdown flow is corrected to make it meet the requirements of formula (1). The action speed of this proportional control is very fast, except th...

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Abstract

The invention discloses an optimal energy-saving method for controlling the surface pollutant discharge of a steam boiler. The method comprises the steps of firstly controlling the flow of pollutant discharge according to the steam flow proportionally, and continuously diluting water in the steam boiler as required; on this basis, configuring a conductivity close loop control circuit to prevent the influences, such as water supply salinity fluctuation, flow rate measurement error, boiler bottom periodic pollutant discharge and the like, and coupling the both by an addition logic unit so as to form a feedforward-feedback complex control system. The invention can prevent various interferences, stably keep the salinity of the water in the steam boiler above the desired level, and realize the optimal energy-saving and emission-reducing effects by the least pollutant discharge amount.

Description

Technical field: [0001] The invention belongs to the field of energy saving and emission reduction of boilers, and is used for the surface blowdown control of steam boilers. The goal is to control the salt concentration of the boiler water close to the allowable limit with the least amount of sewage discharge, to ensure that the quality of the steam produced meets the standard, and the boiler operates safely and economically. Background technique: [0002] When the steam boiler is in operation, the boiler water is concentrated as the steam is produced. When the salt concentration rises to a certain level, the pot water will produce bubbles, soda and water will rise together, and a large amount of water will be carried in the steam, which will cause a serious false water level and make the control of the furnace condition unstable. Therefore, the salt concentration of boiler water must be controlled to ensure steam quality and boiler operation safety. [0003] my country ha...

Claims

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Application Information

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IPC IPC(8): F22B37/54F22B35/00
Inventor 施仁张竤斌张志建李梅施乐平张卫
Owner 西安交大思源科技股份有限公司
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