Automatic control system and method for regional cooling and heating steam desuperheating and decompression

Abstract

The invention provides an automatic control system and method for regional cooling and heating steam desuperheating and decompression. The method comprises the steps that a regional cold / heat load demand is calculated; the number of steam devices to be operated is calculated, and the increase or decrease of the steam devices is judged to screen the devices; the steam pressure control target value,the temperature control target value, and the system pressure / temperature alarm limit are comprehensive calculated; whether the pressure / temperature of the current steam inlet is lower than the pressure / temperature low limit alarm value of the system is judged, and if so, an alarm is sent to an upper computer; when the pressure at the inlet of a steam pipe network is higher than the pressure of the system, automatic adjusting of the opening degree of a steam pressure regulating valve is realized through a PID algorithm for decompression control; when the temperature at the inlet of the steampipe network is higher than the temperature limit of the system, automatic control of the opening degree of a desuperheating valve and the operating frequency of a desuperheating pump is realized through the PID algorithm to perform desuperheating control; and if the temperature meets a requirement after desuperheating and decompression, the device is started. According to the invention, the working efficiency is improved; the operating cost is reduced; and energy is saved.

Description

technical field [0001] The invention belongs to the field of industrial production in the cooling and heating industry, and in particular relates to an automatic control system and method for reducing the temperature and pressure of steam for district cooling and heating. Background technique [0002] In district cooling and heating systems, all kinds of equipment using steam are usually distributed in different physical locations in the area, so it is necessary to configure steam desuperheating and decompression devices in various places to adjust the temperature and pressure of the steam pipe network for the second time Then send it to the steam-using equipment so that the steam can meet the use and safety requirements of various steam-consuming equipment. [0003] Traditional desuperheating and decompression devices have the following problems: [0004] 1) The traditional steam desuperheating and pressurizing devices are separated, and the pressure reducing valve, desupe...

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Problems solved by technology

[0008] The invention proposes an automatic control system and method for regional cooling and heating steam temperature reduction and pressure reduction to solve the shortcomings of traditional temperature reduction and pressure reduction devices

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