A control system for a temperature and pressure reduction station

Abstract

The present invention discloses a novel control system for a temperature and pressure reduction station, which includes a pressure reduction system, a temperature reduction system and a remote intelligent control system; the pressure reduction system and the temperature reduction system can be manually controlled individually, and can also be remotely intelligently integrated and controlled, the pressure reduction system is introduced by a gas distribution pipeline, and the gas distribution pipeline is respectively connected to an electric actuator valve and a local / remote pressure gauge, a temperature gauge and a safety valve; the temperature reduction system mainly includes an intelligent regulating valve, an atomizing temperature reducer, a water supply regulating valve, a steam trap, a water supply pump, a manual stop valve, etc.; the remote intelligent control system includes a remote monitoring terminal and a local control terminal, and the remote monitoring terminal and the local control terminal communicate through a network. On the basis of the original local control intelligent instrument function, the present invention can achieve the goal of upgrading to an intelligent factory, realize the intelligentization of production equipment, visualization of production data and unmanned production site.

Description

Technical Field

[0001] The patent of this invention relates to a control system for a temperature and pressure reduction station, which belongs to the field of intelligent production technology. Background Art

[0002] The existing cooling and pressure reduction system is controlled by local instruments, which requires designated personnel to conduct patrol inspections, meter readings and supervision and control. It cannot achieve the goal of a smart factory and cannot achieve the purpose of remote control and intelligent monitoring.

[0003] The local intelligent instrument-controlled cooling and pressure reduction system requires at least three people to conduct inspections and meter readings in three shifts around the clock, and the valves and water pumps need to be opened and closed on the local side. This has caused a great waste of manpower and various resources, and the cost cannot be reduced. Therefore, a new system that can achieve unmanned operation and remote intelligent control is urgently needed. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the current prior art and to achieve the goal of smart factory, and to propose a cooling and pressure reduction station control system with unmanned operation and remote control and meter reading functions.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A control system for a temperature and pressure reduction station, comprising a pressure reduction system, a temperature reduction system and a remote intelligent control system, wherein:

[0007] The decompression system includes a first remote pressure transmitter and a first remote temperature transmitter connected to the gas distribution pipe, the first remote pressure transmitter and the first remote temperature transmitter are connected to the electric actuator valve, the second remote pressure transmitter, and the second remote temperature transmitter in sequence through pipelines, and the rear pipeline of the electric actuator valve is connected to the temperature reduction system;

[0008] The cooling system includes a cooling branch line led from the rear pipeline of the electric actuator valve, and an intelligent regulating valve, a remote pressure gauge, a third remote temperature transmitter, an on-site steam trap, an atomizing cooler, a water supply regulating valve, a water supply pump and a manual stop valve arranged on the cooling branch line;

[0009] The remote intelligent control system comprises a remote monitoring terminal and a local control terminal, and the remote monitoring terminal and the local control terminal communicate with each other via a network.

[0010] Furthermore, a local control cabinet is provided on one side of the electric actuator valve, and the electric actuator valve, the first remote pressure transmitter, the first remote temperature transmitter, the second remote pressure transmitter, the second remote temperature transmitter, the intelligent regulating valve, the remote pressure gauge, the third remote temperature transmitter, and the atomizing desuperheater are all connected to the local control cabinet, and the local control cabinet is communicatively connected to the remote monitoring terminal.

[0011] Furthermore, the remote intelligent control system includes a monitoring layer, the monitoring layer is connected to a network switch, one end of the network switch is connected to a touch screen, and the other end is connected to a control unit, and the control unit is respectively connected to a local digital display and a local control instrument. The touch screen, the control unit, the local digital display and the local control instrument can be used as part of a local control cabinet.

[0012] Furthermore, the touch screen adopts a high-definition touch display screen.

[0013] Furthermore, one end of the cooling branch pipeline is connected to the pipeline at the rear of the electric actuator valve, and the other end is divided into two branches, one of which is connected to the water tank, and a water supply pump, a water supply regulating valve and an atomizing cooler are arranged in sequence on the branch, and a remote pressure gauge, a third remote temperature transmitter, an on-site drain valve and a manual stop valve are arranged on the other branch.

[0014] Furthermore, 3 to 5 water supply pumps are provided.

[0015] A control method for a temperature and pressure reduction station control system, the steps of which are as follows:

[0016] (1) Steam from the thermal network enters this system and is connected through the gas distribution pipeline;

[0017] (2) The first remote pressure transmitter and the first remote temperature transmitter installed at the rear end of the gas distribution pipeline collect the pressure and temperature of the thermal network and send them to the local control cabinet for real-time monitoring. The pressure and temperature signals after the electric actuator valve are collected by the second remote pressure transmitter and the second remote temperature transmitter and sent to the local control cabinet; the rear pressure reduction control is controlled by the electric actuator valve receiving the PLC control signal to adjust the steam on and off size to realize intelligent pressure control; at the same time, a safety valve is connected after the electric actuator valve to prevent overpressure. After adjustment, the steam that reaches the process pressure requirement enters the gas equipment in each plant;

[0018] (3) Take another branch pipe at the rear of the electric actuator valve, connect the branch pipe to the intelligent control valve, and install an atomizer desuperheater at the rear. The desuperheating water is supplied by the water supply pump, and the water supply amount is controlled by the water supply control valve. The steam pressure and temperature after desuperheating are collected through the remote pressure gauge and the third remote temperature transmitter. The manual stop valve is used to put the desuperheated steam into or out of service. The opening of the intelligent control valve and the water supply control valve is output after PID adjustment through the PLC to achieve precise control of the steam temperature.

[0019] In the above scheme, the control system of the desuperheating and pressure reducing station mainly realizes real-time parameter monitoring, automatic equipment control, intelligent temperature and pressure adjustment, automatic system fault diagnosis and alarm, and real-time recording of historical data. The system can monitor the temperature and pressure before and after the desuperheating and pressure reducing device in real time, and collect real-time data of each key parameter of the whole system according to the collection method set by the PLC controller. The collected real-time data is transmitted to the host computer and the touch screen for real-time display, which is convenient for managers to analyze and monitor the data.

[0020] The temperature reduction and pressure reduction control system has two control modes. One is that the PC in the central control room, the on-site touch screen and the PLC together form a control system to control the temperature reduction and pressure reduction, monitor and store data. The other is the original on-site intelligent instrument control mode. The equipment manufacturer provides intelligent instrument control. Considering the on-site conditions, the original intelligent instrument control function is retained. The local and remote switching knobs are added to the control cabinet, and a signal separator is used to divide the on-site sensor signal into two and transmit it to the on-site intelligent instrument and PLC respectively.

[0021] The PLC is used as a lower computer to complete the process control of the system. The control system uses a Siemens PLC CPU model 315-2PN / DP with two ET200 slave stations, and collects field signals through digital and analog signal input and output modules.

[0022] The field equipment mainly includes frequency converters, water pumps, electric valves and various temperature and pressure sensors.

[0023] The system host computer monitoring screen uses Siemens WINCC software to design the human-machine interface. The interface includes system overview screen, parameter setting screen, alarm screen and historical data curve screen.

[0024] The beneficial effects of the present invention are: in order to achieve the goal of building a smart factory, an intelligent control system with intelligent production equipment, visual production data, and unmanned production site is realized, which brings great economic benefits in saving energy, releasing manpower, and saving costs.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the specific system structure of the patent of this invention.

[0027] Figure 2 It is a schematic diagram of the network structure of the patented control system of the present invention.

[0028] Among them: 1-1. The first remote pressure transmitter, 1-2. The first remote temperature transmitter, 1-3. The second remote pressure transmitter, 1-4. The second remote temperature transmitter, 2. Local control cabinet, 3-1. Electric actuator valve, 3-2. Intelligent regulating valve, 3-3. Water supply regulating valve, 4. Local steam trap, 5. Safety valve, 6. Manual stop valve, 7-1. Remote pressure gauge, 7-2. The third remote temperature transmitter, 8-1. Gas distribution pipe, 8-2. Water supply pump, 9. Monitoring layer, 10. Network switch, 11. Touch screen, 12. Control unit, 13. Local digital display, 14. Local execution equipment. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 As shown, a control system for a temperature and pressure reduction station includes a pressure reduction system, a temperature reduction system and a remote intelligent control system, wherein:

[0031] The pressure reducing system includes a first remote pressure transmitter 1-1 and a first remote temperature transmitter 1-2 connected to the gas distribution pipe 8-1. The first remote pressure transmitter 1-1 and the first remote temperature transmitter 1-2 are connected to the electric actuator valve 3-1, the second remote pressure transmitter 1-3, and the second remote temperature transmitter 1-4 in sequence through pipelines. A local control cabinet 2 is arranged on the left side of the electric actuator valve 3-1, and the rear pipeline of the electric actuator valve 3-1 is connected to the cooling system.

[0032] The cooling system includes a cooling branch pipeline led out from the rear pipeline of the electric actuator valve 3-1, and an intelligent regulating valve 3-2, a remote pressure gauge 7-1, a third remote temperature transmitter 7-2, an on-site steam trap 4, an atomizing cooler 8-3, a water supply regulating valve 3-3, a water supply pump 8-2 and a manual stop valve 6 arranged on the cooling branch pipeline.

[0033] The remote intelligent control system includes a monitoring layer 9, which is connected to a network switch 10. One end of the network switch 10 is connected to a touch screen 11, which can be a high-definition type, and the other end is connected to a control unit 12. The control unit 12 is respectively connected to a local digital display 13 and a local control instrument 14.

[0034] In this system, the first remote pressure transmitter 1-1 and the first remote temperature transmitter 1-2 are connected to the gas distribution pipeline 8-1 to collect the pressure and temperature before the thermal network valve. The rear part is connected to the electric pressure reducing valve 3-1 and the safety valve 5 is installed to protect the pipeline from overpressure. The second remote pressure transmitter 1-3 and the second remote temperature transmitter 1-4 are also installed after the electric pressure reducing valve 3-1 to collect the steam pressure and temperature after the valve. At the same time, PID adjustment is performed to realize the pressure control and adjustment of the corresponding set value, and the steam that meets the process requirements is sent to the gas equipment in each plant. A branch pipeline is led out from the rear of the gas distribution pipeline 8-1 of the electric actuator 3-1 for temperature reduction control. The branch pipeline is connected to the intelligent regulating valve 3-2. The intelligent regulating valve 3-2 adjusts the steam consumption, and the condensed water in the low-temperature condensate tank is supplied by the water supply pump 8-2 to mix with the steam for cooling through the water supply regulating valve 3-3 and the atomizing cooler 8-3. The opening of the intelligent regulating valve 3-2 and the water supply regulating valve 3-3 is output after PID adjustment by the control unit to achieve the function of precise temperature control. After the steam reaching the set temperature is generated, it is transported to the user side for use.

[0035] like Figure 2 As shown, the structure configuration of the automatic control system and remote monitoring system is performed: program configuration is performed through the control unit 12 PLC, network configuration is performed using profinet and TCP / IP protocols, and communication is performed using a network switch 10, connecting the touch screen 11 of the local control cabinet and the monitoring layer 9, the local digital display 13 and the local control instrument 14 collect and control signals sent and collected by the control unit 12, and the monitoring of the monitoring layer 9 uses a configuration software to collect and monitor the on-site signals. In normal operation, no personnel adjustment is required, and the settings of various pressures and temperatures must be set in the central control room, and then the internal program is automatically controlled through PID to achieve automatic adjustment and collection of local data information, and realize unattended remote monitoring and meter reading functions.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the protection scope of the present invention in any form, and all technical solutions obtained by equivalent replacement and the like fall within the protection scope of the present invention.

[0037] The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

Claims

1. A control system for a temperature and pressure reduction station, characterized in that: It includes pressure reduction system, temperature reduction system and remote intelligent control system, among which: The decompression system comprises a first remote pressure transmitter (1-1) and a first remote temperature transmitter (1-2) connected to the gas distribution pipe (8-1); the first remote pressure transmitter (1-1) and the first remote temperature transmitter (1-2) are connected to the electric actuator valve (3-1), the second remote pressure transmitter (1-3), and the second remote temperature transmitter (1-4) in sequence through pipelines; the rear pipeline of the electric actuator valve (3-1) is connected to the decompression system; The cooling system comprises a cooling branch pipeline extending from a pipeline at the rear of the electric actuator valve (3-1), and an intelligent regulating valve (3-2), a remote pressure gauge (7-1), a third remote temperature transmitter (7-2), a local steam trap (4), an atomizing desuperheater (8-3), a water supply regulating valve (3-3), a water supply pump (8-2) and a manual stop valve (6) arranged on the cooling branch pipeline; one end of the cooling branch pipeline is connected to the pipeline at the rear of the electric actuator valve (3-1), and the other end is divided into two branches, one of which is connected to a water tank, and the water supply pump (8-2), the water supply regulating valve (3-3) and the atomizing desuperheater (8-3) are arranged on the branch in sequence, and the other branch is provided with a remote pressure gauge (7-1), a third remote temperature transmitter (7-2), a local steam trap (4) and a manual stop valve (6); The remote intelligent control system includes a remote monitoring terminal and a local control terminal, and the remote monitoring terminal and the local control terminal communicate via a network; The control system of the temperature and pressure reduction station performs the following control method, and the specific steps are: 1) Steam from the thermal network enters this system and is connected through the gas distribution pipeline; 2) The first remote pressure transmitter (1-1) and the first remote temperature transmitter (1-2) installed at the rear end of the gas distribution pipeline (8-1) collect the pressure and temperature of the thermal network and send them to the local control cabinet (2) for real-time monitoring. The pressure and temperature signals after the electric actuator valve (3-1) are collected by the second remote pressure transmitter (1-3) and the second remote temperature transmitter (1-4) and sent to the local control cabinet (2). The rear pressure reduction control is controlled by the electric actuator valve (3-1) receiving the PLC control signal to adjust the steam on and off size. At the same time, a safety valve (5) is connected after the electric actuator valve (3-1), and the steam that reaches the process pressure requirement after adjustment enters the gas-using equipment in each plant. 3) A branch pipe is taken from the rear of the electric actuator valve (3-1), and the branch pipe is connected to the intelligent control valve (3-2). An atomizing desuperheater (8-3) is installed at the rear. The desuperheating water is supplied by the water supply pump (8-2), and the water supply amount is controlled by the water supply control valve (3-3). The steam pressure and temperature after desuperheating are collected through the remote pressure gauge (7-1) and the third remote temperature transmitter (7-2). The manual stop valve (6) is used to realize the input and stop of the desuperheating steam. The opening of the intelligent control valve (3-2) and the water supply control valve (3-3) is output after PID adjustment through the PLC.

2. A temperature and pressure reduction station control system according to claim 1, characterized in that: A local control cabinet (2) is provided on one side of the electric actuator valve (3-1); the electric actuator valve (3-1), the first remote pressure transmitter (1-1), the first remote temperature transmitter (1-2), the second remote pressure transmitter (1-3), the second remote temperature transmitter (1-4), the intelligent regulating valve (3-2), the remote pressure gauge (7-1), the third remote temperature transmitter (7-2), and the atomizing desuperheater (8-3) are all connected to the local control cabinet (2); and the local control cabinet (2) is in communication connection with a remote monitoring terminal.

3. A temperature and pressure reduction station control system according to claim 1 or 2, characterized in that: The remote intelligent control system comprises a monitoring layer (9), wherein the monitoring layer (9) is connected to a network switch (10), one end of the network switch (10) is connected to a touch screen (11), and the other end is connected to a control unit (12), wherein the control unit (12) is respectively connected to a local digital display (13) and a local control instrument (14).

4. A temperature and pressure reduction station control system according to claim 3, characterized in that: The touch screen (11) adopts a high-definition touch display screen.

5. A temperature and pressure reduction station control system according to claim 1, characterized in that: The water supply pumps (8-2) are provided in 3 to 5 numbers.

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