PID regulator for pressure regulation control applied to waste heat generator set in cement industry

Abstract

The invention provides a PID regulator for pressure regulation control applied to a waste heat generator set in the cement industry. The PID regulator for pressure regulation control applied to the waste heat generator set in the cement industry comprises a shell, and an assembly cavity, a water storage cavity and an air cavity are formed in the shell; the water storage cavity is located between the assembly cavity and the air cavity and used for storing cooling liquid. An opening is formed in the side, away from the water storage cavity, of the assembly cavity, a control panel convenient to operate is fixedly installed on the side, away from the water storage cavity, of the assembly cavity, a control module used for processing information and controlling operation is installed in the assembly cavity, and the control module is matched with the control panel; the air cavity is located on the side, away from the assembling cavity, of the water storage cavity and used for processing cooling air. The PID regulator for pressure regulation control applied to the waste heat generator set in the cement industry has the advantages that the heat dissipation effect of the PID controller is improved, the use condition is optimized, and the damage condition caused by high temperature can be reduced.

Description

technical field [0001] The invention relates to the technical field of waste heat generating sets in the cement industry, in particular to a PID regulator for pressure regulation and control applied to waste heat generating sets in the cement industry. Background technique [0002] Waste heat power generation has been widely used in today's cement industry. But the process design scheme is quite different, basically can be divided into; Integrated bottom air intake, U-shaped boiler, superheater with separate flue arrangement, etc. According to the inlet pressure of the steam turbine, there are basically three types: 0.689mpa, 1.05mpa, and 1.25mpa. According to the exhaust gas temperature, there are three kinds of 83 degrees, 95 degrees, and 116 degrees. [0003] The impact of the increase of the main steam pressure on the operation is mainly as follows: when the main steam temperature is constant, the main steam pressure increases, the enthalpy drop of the whole unit incr...

AI Technical Summary

Problems solved by technology

However, when the main steam pressure rises beyond the limit of the specified variation range, it will directly threaten the safety of the unit. The main points are as follows: (1) The humidity of the steam at the last stages of the unit increases, which deteriorates the working conditions of the moving blades at the last stages , severe water erosion

(2) Increase the enthalpy drop of the regulating stage, which will cause the overload of the moving blades of the regulating stage

(3) It will cause the stress of the main steam pressure-bearing parts to increase, which will shorten the service life of the parts, and may cause deformation of these parts, so as to damage the parts

(3) If the power generated by the unit does not decrease after the main steam pressure is reduced, or even the rated power is still required, the steam flow of the whole machine will inevitably exceed the rated value. At this time, if the pressure of each monitoring section exceeds the maximum allowable value, it will cause Excessive axial thrust is dangerous and not allowed

[0006] However, no matter how it is divided, there are several common problems in the operation of the current waste heat power generation: the pressure control of the steam turbine is too low, and the deviation from the design value is large

Traditional units mostly use 505 controllers. 505 controllers have no main steam pressure control function, and usually use valve position control. The steam pressure is low, the steam loss is large, the steam consumption is high, and the economic benefit is low. Not only does it not save energy, but it also damages production and equipment. For example, steam turbines cause potential safety hazards, so people gradually began to use PID controllers to control the opening of the regulating valve by calculating the difference between the given main steam and the main steam pressure of the system to control the opening of the regulating valve and keep the pressure constant

[0007] However, since the PID controller currently used is relatively traditional, the original heat dissipation effect is greatly reduced due to the environment of the steam unit in use, and it is prone to overheating damage.

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