An automatically adjustable medium-pressure steam device

Abstract

The utility model discloses a kind of automatically adjustable medium-pressure steam devices, including PLC control system and steam pipeline system, further including temperature control probe, pressure transmitter and electric regulating valve being arranged in steam pipeline system, and temperature pressure control instrument being arranged on PLC control system.The utility model realizes the real-time monitoring of oven temperature and the automatic adjustment of steam pressure by the closed-loop control of PLC and temperature pressure control instrument, avoid temperature fluctuation (such as within ±5 ℃), while reducing steam waste, energy-saving rate reaches 5-10%, compact structure, easy to integrate into existing setting machine system, reduce steam pressure difference (conventional 2.5MPa-0.8MPa, after adjustment 0.8MPa-1.0MPa), extend the service life of electric regulating valve, manual bypass valve is connected in steam pipeline bypass, for emergency operation, steam pipeline is closed in time when finding safety hazard, improve safety factor, by collecting and reusing backwater generated to annular gas supply pipe, improve water resource utilization, reduce water consumption.

Description

Technical Field

[0001] This utility model relates to the field of printing and dyeing steam heating technology, and in particular to an automatically adjustable medium-pressure steam device. Background Technology

[0002] In the dyeing and printing industry, equipment such as setting machines often rely on medium-pressure steam (2.0MPa-2.8MPa) for heating to control oven temperature. Currently, steam pressure regulation mainly relies on manual operation or simple mechanical valve control, which presents the following problems: First, the oven process temperature (e.g., 120℃) is easily affected by steam pressure fluctuations, leading to temperature instability, causing dripping of water and oil from the fabric, severely reducing product quality; second, manual pressure adjustment has slow response and poor accuracy, failing to achieve real-time matching of process temperature and pressure, resulting in large steam emissions and energy waste; finally, existing devices lack intelligent control. Although some have proposed the concepts of PLC control systems and temperature and pressure controllers, a complete and efficient automatic regulation system has not yet been formed.

[0003] A steam automatic pressure regulating device is disclosed in Chinese patent document CN203286284U. This device sequentially includes a pressure reducing valve, a steam regulating valve, a safety valve, and an air conditioning unit. A steam pressure sensor and a steam flow sensor, connected to a central processing unit, are installed on the pipeline between the safety valve and the air conditioning unit. The steam regulating valve is electrically connected to the central processing unit, which is also connected to a display unit. The display unit includes a steam pressure signal display unit, a steam flow signal display unit, and a steam regulating valve opening signal display unit. This invention can achieve automatic steam regulation during air conditioning use, ensuring production process standards and reducing frequent safety valve activation, thus minimizing energy waste. However, the large temperature fluctuations in the medium-pressure steam setting machine oven and low steam pressure control accuracy of this automatic steam pressure regulating device lead to decreased fabric quality and energy waste.

[0004] To address the shortcomings of the existing technology, providing an automatically adjustable medium-pressure steam device is a problem worthy of research. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of large temperature fluctuations and steam waste, and to provide an automatic medium-pressure steam device that achieves the technical effect of real-time acquisition of process temperature and automatic adjustment of steam pressure to the set value.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] An automatically adjustable medium-pressure steam device includes a PLC control system and a steam pipeline system, and further includes a temperature control probe, a pressure transmitter and an electric regulating valve installed in the steam pipeline system, as well as a temperature and pressure controller installed on the PLC control system.

[0008] The steam pipeline system includes a ring-shaped steam supply pipe and a return water pipe located below the ring-shaped steam supply pipe, used for the supply and recovery of medium-pressure steam (0.5-1.5MPa).

[0009] The end of the annular steam supply pipe is connected to a main steam supply pipe, and several styling machines are fixedly connected to the return water pipe. The end of the return water pipe is connected to the same main return water pipe, and the drain outlet of the styling machine is fixedly connected to a drain pipe. By collecting and reusing the return water generated by the annular steam supply pipe, the water resource utilization rate is improved and the water consumption is reduced. The heat in the return water is collected by the styling machine, thereby improving the energy utilization rate.

[0010] A drain valve is provided at the end of the drain pipe, and the drain pipe is connected to the drainage system;

[0011] Furthermore, a water quality testing device is installed at the end of the drain pipe to test the water quality of the discharged hot water. If the water quality meets the standards, it is discharged into the water body; if the water quality does not meet the standards, it is treated.

[0012] The steam pipeline system also includes a manual bypass valve installed between the main steam supply pipe and the annular steam supply pipe; the manual bypass valve is connected to the steam pipeline bypass for emergency operation, and can promptly shut off the steam pipeline when a safety hazard is detected, thereby improving the safety factor.

[0013] The PLC control system is communicatively connected to the temperature and pressure controller. After receiving the temperature signal from the temperature control probe, the PLC control system calculates and outputs the set pressure signal to the temperature and pressure controller. Through the closed-loop control between the PLC and the temperature and pressure controller, real-time monitoring of the oven temperature and automatic adjustment of the steam pressure are achieved, avoiding temperature fluctuations (e.g., within ±5℃), reducing steam waste, and achieving an energy saving rate of 5-10%. The system has a compact structure, is easy to integrate into existing stenter systems, is simple to operate, reduces steam pressure difference (conventional 2.5MPa-0.8MPa, adjusted 0.8MPa-1.0MPa), and extends the service life of the electric regulating valve.

[0014] The temperature control probe is model PT100. It is installed in the fifth oven of the setting machine and is used to collect process temperature reference values ​​(such as 120℃).

[0015] Furthermore, the PLC system and the temperature and pressure controller are connected via RS485 or Ethernet communication to achieve real-time data exchange.

[0016] The pressure transmitter collects the actual pressure value of the steam pipeline system, and the temperature and pressure controller compares the set pressure signal with the actual pressure signal and outputs a control signal to the electric regulating valve to regulate the steam pressure balance.

[0017] The electric regulating valve is linked with the PLC control system to achieve proportional regulation.

[0018] Furthermore, the model number of the electric regulating valve is DN40PN4.0.

[0019] Positive and beneficial effects:

[0020] This automatically adjustable medium-pressure steam device, through closed-loop control of PLC and temperature and pressure controller, achieves real-time monitoring of oven temperature and automatic adjustment of steam pressure, avoiding temperature fluctuations (e.g., within ±5℃), while reducing steam waste and achieving an energy saving rate of 5-10%. It features a compact structure, easy integration into existing stenter systems, simple operation, reduced steam pressure difference (conventional 2.5MPa-0.8MPa, adjusted 0.8MPa-1.0MPa), and extended service life of the electric regulating valve. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] In the diagram: 1-PLC control system, 2-temperature probe, 3-temperature and pressure controller, 4-pressure transmitter, 5-electric regulating valve, 6-steam pipeline system, 601-ring steam supply pipe, 602-return water pipe, 603-steam supply main pipe, 604-styling machine, 605-return water main pipe, 606-drain pipe, 607-drain valve, 608-manual bypass valve. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. Example 1

[0024] like Figure 1 As shown, an automatically adjustable medium-pressure steam device includes a PLC control system 1 and a steam pipeline system 6, and also includes a temperature control probe 2, a pressure transmitter 4 and an electric regulating valve 5 installed in the steam pipeline system 6, as well as a temperature and pressure controller 3 installed on the PLC control system 1.

[0025] like Figure 1 As shown, the steam pipeline system 6 includes a ring-shaped steam supply pipe 601 and a return water pipe 602 located below the ring-shaped steam supply pipe 601, which is used for the supply and recovery of medium-pressure steam (0.5-1.5MPa).

[0026] like Figure 1As shown, the end of the annular steam supply pipe 601 is connected to the steam supply main pipe 603, and several stenters 604 are fixedly connected to the return water pipe 602. The end of the return water pipe 602 is connected to the same return water main pipe 605, and the drain outlet of the stenter 604 is fixedly connected to the drain pipe 606. By collecting and reusing the return water generated by the annular steam supply pipe 601, the water resource utilization rate is improved and the water consumption is reduced. The heat in the return water is collected by the stenter 604, thereby improving the energy utilization rate.

[0027] like Figure 1 As shown, a drain valve 607 is provided at the end of the drain pipe 606, and the drain pipe 606 is connected to the drainage system;

[0028] Furthermore, a water quality testing device is installed at the end of the drain pipe 606 to test the water quality of the discharged hot water. If the water quality meets the standards, it is discharged into the water body; if the water quality does not meet the standards, it is treated.

[0029] like Figure 1 As shown, the steam pipeline system 6 also includes a manual bypass valve 608 installed between the main steam supply pipe 603 and the annular steam supply pipe 601; the manual bypass valve 608 is connected to the steam pipeline bypass for emergency operation, and can close the steam pipeline in time when a safety hazard is found, thereby improving the safety factor.

[0030] like Figure 1 As shown, the PLC control system 1 is communicatively connected to the temperature and pressure controller 3. After receiving the temperature signal from the temperature control probe 2, the PLC control system calculates and outputs the set pressure signal to the temperature and pressure controller 3. Through the closed-loop control between the PLC and the temperature and pressure controller, real-time monitoring of the oven temperature and automatic adjustment of the steam pressure are achieved, avoiding temperature fluctuations (e.g., within ±5℃), reducing steam waste, and achieving an energy saving rate of 5-10%. The structure is compact, easy to integrate into existing stenter systems, simple to operate, reduces steam pressure difference (conventional 2.5MPa-0.8MPa, adjusted 0.8MPa-1.0MPa), and extends the service life of the electric regulating valve.

[0031] The temperature control probe 2 is model PT100. It is installed in the fifth oven of the setting machine and is used to collect process temperature reference values ​​(such as 120℃).

[0032] Furthermore, the PLC system and the temperature and pressure controller are connected via RS485 or Ethernet communication to achieve real-time data exchange.

[0033] like Figure 1 As shown, the pressure transmitter 4 collects the actual pressure value of the steam pipeline system 6, the temperature and pressure controller 3 compares the set pressure signal with the actual pressure signal, and outputs a control signal to the electric regulating valve 5 to regulate the steam pressure balance.

[0034] like Figure 1 As shown, the electric regulating valve 5 is linked with the PLC control system 1 to achieve proportional regulation;

[0035] Furthermore, the model number of the electric regulating valve 5 is DN40PN4.0. Example 2

[0036] During installation, the PT100 temperature probe is placed inside the oven to collect the process temperature (set reference value 120℃). The PLC control system receives the temperature signal, calculates the set pressure signal (e.g., 0.8MPa) using its internal algorithm (PID control), and sends it to the temperature and pressure controller. The pressure transmitter monitors the actual pressure of the steam pipeline in real time (e.g., 2.0MPa-2.8MPa). The temperature and pressure controller compares the set value (0.8MPa) with the collected value (2.0MPa-2.8MPa). If the collected value is higher than the set value, it outputs a control signal to decrease the opening of the electric regulating valve; conversely, it increases the opening to achieve pressure balance. The PLC and the temperature and pressure controller are connected via RS485 communication to ensure data synchronization.

[0037] Operation process:

[0038] 1. After the process temperature has stabilized for 5 minutes, start the system. The PLC will collect the oven process temperature (reference value 120℃) through the PT100 temperature control probe.

[0039] 2. The PLC calculates and outputs a signal (set value 0.8MPa) to the temperature and pressure controller.

[0040] 3. The temperature and pressure controller acquires the pressure transmitter signal (actual value 2.0MPa-2.8MPa).

[0041] 4. The temperature and pressure controller compares the set value (0.8MPa) with the collected value (2.0MPa-2.8MPa), calculates the deviation, and outputs a signal to control the opening of the electric regulating valve to adjust the steam pressure to the equilibrium point.

[0042] In this embodiment, the pressure control accuracy reaches ±0.1MPa, the oven temperature is stabilized at 120±2℃, effectively preventing water dripping and saving 5-10% energy.

[0043] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. An automatically adjustable medium-pressure steam device, comprising a PLC control system (1) and a steam pipeline system (6), characterized in that: It also includes a temperature control probe (2), a pressure transmitter (4) and an electric regulating valve (5) installed in the steam pipeline system (6), and a temperature and pressure controller (3) installed on the PLC control system (1).

2. The automatically adjustable medium-pressure steam device according to claim 1, characterized in that: The steam pipeline system (6) includes an annular steam supply pipe (601) and a return water pipe (602) located below the annular steam supply pipe (601).

3. The automatically adjustable medium-pressure steam device according to claim 2, characterized in that: The end of the annular steam supply pipe (601) is connected to a steam supply main pipe (603), a number of styling machines (604) are fixedly connected to the return water pipe (602), the end of the return water pipe (602) is connected to the same return water main pipe (605), and the drain outlet of the styling machine (604) is fixedly connected to a drain pipe (606).

4. The automatically adjustable medium-pressure steam device according to claim 3, characterized in that: The drain pipe (606) is provided with a drain valve (607) at its end, and the drain pipe (606) is connected to the drainage system.

5. The automatically adjustable medium-pressure steam device according to claim 3, characterized in that: The steam pipeline system (6) also includes a manual bypass valve (608) located between the main steam supply pipe (603) and the annular steam supply pipe (601).

6. The automatically adjustable medium-pressure steam device according to claim 1, characterized in that: The PLC control system (1) is connected to the temperature and pressure controller (3) for communication. After receiving the temperature signal from the temperature control probe (2), the PLC control system calculates and outputs the set pressure signal to the temperature and pressure controller (3).

7. The automatically adjustable medium-pressure steam device according to claim 1, characterized in that: The pressure transmitter (4) collects the actual pressure value of the steam pipeline system (6), and the temperature and pressure controller (3) compares the set pressure signal with the actual pressure signal and outputs a control signal to the electric regulating valve (5) to regulate the steam pressure balance.

8. The automatically adjustable medium-pressure steam device according to claim 1, characterized in that: The electric regulating valve (5) is linked with the PLC control system (1) to achieve proportional regulation.

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