Heat accumulating type electric steam generating device control system

Abstract

A heat accumulating type electric steam generating device control system comprises a control module, a monitoring module connected with the control module through a signal transmission cable, and a power module connected with the control module through a signal transmission cable. According to the control system of the heat accumulating type electric steam generating device, the heat accumulating type electric steam generating device can be controlled to output steam with stable quality through real-time temperature and pressure parameter monitoring, and the safety in the operation process is ensured; and the steam outlet temperature and pressure of the heat accumulating type electric steam generating device can be changed by adjusting the working state of the pump set, so that the heat accumulating type electric steam generating device can adapt to different working condition requirements.

Description

Technical Field

[0001] The present invention relates to the field of steam generating devices, and in particular to a control system for a heat storage type electric steam generating device. Background Art

[0002] A steam generating device converts energy such as fuel or electric energy into heat energy and then heats water into steam. The heat storage type electric steam generating device is based on the traditional electric steam generating device and adds a heat storage module, so that the heat storage type electric steam generating device can utilize the electric energy during the low electricity consumption period or the part of the electric energy where the power generation exceeds the electricity consumption, convert it into heat energy and store it, and utilize the heat energy stored in the heat storage module to supply steam during the peak electricity consumption period of the power grid, thereby achieving peak shaving and valley filling, saving electric energy, and reducing the emission of carbon dioxide during industrial production.

[0003] The heat storage type electric steam generating device stores heat energy through a heat storage module, which is divided into latent heat type and sensible heat type. The latent heat type heat storage module uses a phase change type heat storage body, and utilizes the phase change latent heat absorbed or released during the phase change process of the heat storage body itself during the phase change of the heat storage body to store and release heat energy; the sensible heat type heat storage module uses a sensible heat type heat storage body, and utilizes the specific heat capacity of the heat storage body itself to store and release heat during the process of the temperature rise or fall of the heat storage body, and during the temperature change process, the physical form of the heat storage body will not change.

[0004] Regardless of whether the heat storage type electric steam generating device adopts a latent heat type heat storage module or a sensible heat type heat storage module, in order to ensure the stability of the output steam quality (with specific pressure and temperature) during use, when selecting the heat storage module, the temperature of the heat storage body needs to be appropriately higher than the steam temperature to ensure that there is a certain temperature difference between the temperature of the heat storage body and the temperature of the output steam, so as to ensure that heat energy can be transferred between the water and the heat storage body, and steam can be continuously and stably generated.

[0005] Due to the existence of the temperature difference between the heat storage body temperature and the output steam temperature, the steam generated by the heat storage type electric steam generating device during the heat release process is generally superheated steam. Since superheated steam is formed by continuously absorbing heat on the basis of saturated steam, its temperature and pressure are no longer in a one-to-one correspondence relationship. When superheated steam is used, it cannot be liquefied in time after cooling, and the vaporization enthalpy in the steam cannot be released in time, resulting in poor heat exchange effect of superheated steam. Therefore, it is necessary to adjust the superheated steam generated by the heat storage type electric steam generating device to saturated steam for use at the application end. Summary of the Invention

[0006] In view of the above problems, the present invention provides a control system for a heat storage type electric steam generating device, which can realize steam control based on steam temperature and pressure, accurately control the heat charging / discharging process of the heat storage type electric steam generating device, and achieve the output of saturated steam.

[0007] To achieve the above object, the specific technical solution of the control system of the regenerative electric steam generating device proposed by the present invention is as follows:

[0008] A control system of a regenerative electric steam generating device includes a control module, a monitoring module connected to the control module through a signal transmission cable, and a power module connected to the control module through a signal transmission cable;

[0009] The control module includes a receiving unit, a storage unit, a determination unit, and an output unit;

[0010] The receiving unit is connected to the monitoring module and is used to receive the real-time monitoring information of the monitoring module;

[0011] The storage unit is used to store the real-time monitoring information obtained by the receiving unit;

[0012] The determination unit is used to compare and analyze the obtained monitoring information with the pre-set control boundary information and determine whether to change the output signal;

[0013] The output unit is connected to the power module and is used to output the control signal of the determination unit to adjust the working state of the regenerative electric steam generating device;

[0014] The monitoring module includes a temperature monitor, a pressure monitor, a flow monitor, and a transmitter, and is used to monitor the working state of the regenerative electric steam generating device and convert it into an electrical signal and then transmit it to the receiving unit of the control module.

[0015] Further, the power module includes a pump group and an electrothermal conversion element;

[0016] The pump group is used to drive water and steam and provide power for the movement of water and steam;

[0017] The electrothermal conversion element is used to convert electrical energy into heat energy.

[0018] Further, the heat storage module of the regenerative electric steam generating device is a latent heat storage module, and the phase change heat storage material in the heat storage module stores / releases heat through phase change.

[0019] Further, a temperature monitoring element is buried in the phase change heat storage material, which is used to monitor the temperature of the phase change heat storage material in real time and transmit the temperature monitoring result to the control module in real time. The control module controls the working state of the electrothermal conversion element by controlling the opening or closing of the relay connected to the electrothermal conversion element, and further controls the heating rate of the phase change heat storage material.

[0020] Further, the control module determines the heat release cut-off condition of the regenerative electric steam generating device by analyzing the temperature monitoring data of the temperature monitoring element in real time according to the temperature data.

[0021] Further, the pump set is connected to a frequency converter, and the control module can automatically adjust the output power of the frequency converter according to the change in the steam consumption demand, thereby changing the output power of the pump set.

[0022] Further, the control module determines the output power of the frequency converter by analyzing the detection results of the pressure monitoring element in real time, and determines the output power of the frequency converter according to the negative deviation degree between the real-time pressure monitoring result of the pressure monitoring element and the set pressure. The greater the negative deviation degree, the greater the output frequency of the frequency converter.

[0023] Further, by adjusting the output power of the frequency converter, the water supply capacity of the pump set is changed, so as to adjust the temperature and pressure parameters of the steam output by the regenerative electric steam generating device, and change the steam production quality of the electric steam generating device.

[0024] The control system of the regenerative electric steam generating device of the present invention can control the regenerative electric steam generating device to output steam with stable quality through real-time temperature and pressure parameter monitoring, ensuring safety during operation; and by adjusting the working state of the pump set, the steam outlet temperature and pressure of the regenerative electric steam generating device can be changed, so that the regenerative electric steam generating device can adapt to different working conditions. Detailed Embodiment

[0025] In order to better understand the purpose, structure and function of the present invention, the control system of the regenerative electric steam generating device of the present invention will be further described in detail below in conjunction with the specific embodiments.

[0026] The control system of the regenerative electric steam generating device of the present invention includes a control module, a monitoring module connected to the control module through a signal transmission cable, and a power module connected to the control module through a signal transmission cable.

[0027] The control module includes a receiving unit, a storage unit, a determination unit and an output unit, which are used to receive, store and analyze various monitoring data obtained by the monitoring module in real time, and transmit the control signal to the power module through the transmission cable according to the analysis result to control and adjust the working parameters of the power module;

[0028] The receiving unit is connected to the monitoring module through a transmission cable, and is used to receive the real-time monitoring information of the monitoring module;

[0029] The storage unit is used to store the real-time monitoring information received by the receiving unit;

[0030] The determination unit is used to compare the obtained monitoring information with the pre-set control boundary information, and analyze and determine whether the output signal needs to be changed;

[0031] The output unit is connected to the power module and is used to output control information;

[0032] The monitoring module is used to monitor the state parameters such as temperature, pressure, and flow rate of superheated steam and saturated steam in real time. After converting the signals into electrical signals, they are transmitted to the receiving unit of the control module, including a temperature monitor, a pressure monitor, a flow monitor, and a transmitter;

[0033] The temperature monitor, pressure monitor, and flow monitor collect the temperature, pressure, and flow parameters of superheated steam and saturated steam in real time;

[0034] The transmitter is used to convert the temperature, pressure, and flow parameters collected by the temperature monitor, pressure monitor, and flow monitor in real time into electrical signals and transmit them to the receiving unit on the control module;

[0035] The power module is used to provide power for the operation of the regenerative electric steam generator, including a pump group and an electrothermal conversion element;

[0036] The pump group is used to drive water and steam and provide power for water and steam;

[0037] The electrothermal conversion element is used to convert electrical energy into heat energy, and the heat storage module absorbs and stores the heat energy.

[0038] In the regenerative electric steam generator of this embodiment, a latent heat storage module is adopted. The phase change heat storage material in the heat storage module stores / releases heat through phase change. The electric heating device converts electrical energy into heat energy and stores it in the phase change heat storage material; the pump group drives water to flow in the heat exchange component. During the process, the heat in the phase change heat storage material is conducted to the water through the heat exchange component to generate steam.

[0039] When the regenerative electric steam generator of this embodiment operates, it is divided into a heat charging process and a heat discharging process.

[0040] During the heat charging process, the temperature of the phase change heat storage material is monitored in real time through the temperature monitoring element buried in the phase change heat storage material. After the temperature signal is converted into an electrical signal by the transmitter, it is transmitted to the control module in real time; according to the temperature monitoring result, the control module controls the opening or closing of the electrothermal conversion element through a relay; during the heat charging process, if the temperature monitoring element monitors that the temperature of the phase change heat storage material is abnormal, the control module can respond in time to cut off the power supply of the electric heating device to ensure the safe use of the phase change heat storage material during the heating process.

[0041] During the exothermic process, the pump group passes water into the heat exchange component. The water obtains the thermal energy in the phase change heat storage material in the heat exchange component and vaporizes to generate steam. During the steam generation process, the temperature and pressure monitoring elements continuously monitor the temperature and pressure parameters of the steam, and convert the monitoring data into electrical signals through a transmitter and transmit them to the control module in real time. According to the monitoring results, the control module adjusts the output frequency of the frequency converter in real time, changes the output power of the pump group, and then conducts real-time regulation of the steam state. During the exothermic process, the monitoring module continuously monitors the temperature and pressure parameters, and the control module adjusts the control parameters in real time to adjust the steam state.

[0042] The temperature of the phase change heat storage material is continuously monitored by the temperature monitoring element buried in the phase change heat storage material. The transmitter converts the temperature signal into an electrical signal and transmits it to the control module in real time. The control module automatically conducts state judgment and state adjustment according to the temperature monitoring results and the initial settings. After reaching the end of the exothermic process, the pump group is automatically shut down, and the heat storage type electric steam generator can automatically stop exothermic.

[0043] In order to change the thermal energy output power of the heat storage type electric steam generator, the pump group is connected to a frequency converter. According to the steam demand, the control module automatically adjusts the output frequency of the frequency converter, changes the output power of the pump group, and then changes the water inflow rate to adjust the steam output rate of the heat storage type electric steam generator, and further changes the thermal energy output power of the heat storage type electric steam generator. By adjusting the relationship between the water inflow rate and the steam output rate, the pressure and temperature of the steam are adjusted, so as to adjust the steam quality.

[0044] It can be understood that the present invention is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present invention, various changes or equivalent replacements can be made to these features and embodiments. In addition, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A control system for a regenerative electric steam generation device, characterized in that: it includes a control module, a monitoring module connected to the control module through a signal transmission cable, and a power module connected to the control module through a signal transmission cable; the control module includes a receiving unit, a storage unit, a determination unit, and an output unit; the receiving unit is connected to the monitoring module and is used to receive the real-time monitoring information of the monitoring module; the storage unit is used to store the real-time monitoring information obtained by the receiving unit; the determination unit is used to compare and analyze the obtained monitoring information with the pre-set control boundary information and determine whether to change the output signal; the output unit is connected to the power module and is used to output the control signal of the determination unit to adjust the working state of the regenerative electric steam generation device; the monitoring module includes a temperature monitor, a pressure monitor, a flow monitor, and a transmitter, and is used to monitor the working state of the regenerative electric steam generation device and convert it into an electric signal and then transmit it to the receiving unit of the control module.

2. The control system for a regenerative electric steam generation device according to claim 1, characterized in that: the power module includes a pump group and an electrothermal conversion element; the pump group is used to drive water and steam and provide power for the movement of water and steam; the electrothermal conversion element is used to convert electrical energy into heat energy.

3. The control system for a regenerative electric steam generation device according to claim 1 or 2, characterized in that: the heat storage module of the regenerative electric steam generation device is a latent heat storage module, and the phase change heat storage material in the heat storage module stores / releases heat through phase change.

4. The control system for a regenerative electric steam generation device according to claim 3, characterized in that: a temperature monitoring element is buried in the phase change heat storage material, which is used to monitor the temperature of the phase change heat storage material in real time and transmit the temperature monitoring result to the control module in real time. The control module controls the working state of the electrothermal conversion element by controlling the opening or closing of the relay connected to the electrothermal conversion element, and further controls the heating rate of the phase change heat storage material.

5. The control system for a regenerative electric steam generation device according to claim 4, characterized in that: the control module determines the heat release cut-off condition of the regenerative electric steam generation device by analyzing the temperature monitoring data of the temperature monitoring element in real time and according to the temperature data.

6. The control system for a regenerative electric steam generation device according to claim 2, characterized in that: the pump group is connected to a frequency converter, and the control module can automatically adjust the output power of the frequency converter according to the change of the steam consumption demand and change the output power of the pump group.

7. The control system for a regenerative electric steam generation device according to claim 6, characterized in that: the control module determines the output power of the frequency converter by analyzing the detection result of the pressure monitoring element in real time and according to the negative deviation degree between the real-time pressure monitoring result of the pressure monitoring element and the set pressure. The greater the negative deviation degree, the greater the output frequency of the frequency converter.

8. The control system for a regenerative electric steam generation device according to claim 6, characterized in that: By adjusting the output power of the frequency converter, the water supply capacity of the pump set is changed, so as to adjust the temperature and pressure parameters of the steam output by the heat storage type electric steam generating device, and change the steam production quality of the electric steam generating device.