Steam output system of ultrahigh-temperature solid heat storage device and control method

Abstract

The invention discloses a steam output system of an ultrahigh-temperature solid-state heat storage device and a control method, and relates to a flow control device and method. In order to solve the problems that according to an existing double-air-valve control method, control over the opening degrees of two air valves is not accurate enough, and normal and stable operation of a system cannot be guaranteed, the double-air-valve control system comprises a steam generation device, an air supply device, a temperature control device and a control device, and the steam generation device is used for outputting low-temperature air to a draught fan and used for outputting steam and recycling hot air; the fan is used for conveying low-temperature air to the main air valve and the air mixing valve; the main air valve is used for outputting low-temperature air to the ultrahigh-temperature solid heat storage device at a first flow; the ultrahigh-temperature solid heat storage device is used for heating low-temperature air and outputting high-temperature air; the air mixing valve is used for outputting low-temperature air at a second flow; the low-temperature air and the high-temperature air are converged and mixed to obtain hot air; the steam output pressure sensor is used for collecting steam output pressure; the hot air temperature sensor is used for collecting hot air temperature; the adjusting module is used for adjusting the opening degree of the air mixing valve; and the hot air keeps constant temperature.

Description

Technical Field

[0001] The invention relates to a flow control device and method. Background Art

[0002] In ultra-high temperature solid-state heat storage devices, the temperature range of the output hot air is large, and the highest hot air temperature reaches above 750°C. Therefore, the material requirements for the back-end steam generation equipment are extremely high, which increases the cost of the steam generation equipment and shortens the service life of the equipment. In addition, when the medium temperature changes in the range, the medium flow rate needs to change synchronously to ensure the stability of the system output enthalpy value. Therefore, it is difficult to control and it is not easy to maintain the stability of the output steam.

[0003] The dual air valve mixed air structure design can generate constant temperature and constant volume of hot air, reduce the material requirements for steam generation equipment, increase the service life of the equipment, and ensure the stability of the output steam. However, as the temperature of the heat storage body of the solid-state heat storage device decreases, the opening of the two air valves needs to be controlled at the same time, and the existing dual air valve control method is not accurate enough to control the opening of the two air valves, and cannot ensure the normal and stable operation of the system. Summary of the invention

[0004] The purpose of the present invention is to overcome the problem that the existing dual air valve control method is not accurate enough in controlling the opening of the two air valves and cannot ensure the normal and stable operation of the system, and to provide a steam output system and control method for an ultra-high temperature solid-state heat storage device.

[0005] The present invention provides a steam output system for an ultra-high temperature solid-state heat storage device, comprising a steam generating device, a fan, a main air valve, an ultra-high temperature solid-state heat storage device, an air mixing valve, a steam output pressure sensor, a hot air temperature sensor and a regulating module;

[0006] Steam generating equipment, used to output low-temperature air to the fan, and used to output steam and recover hot air;

[0007] A fan is used to deliver low-temperature air to the main air valve and the mixing air valve respectively;

[0008] A main air valve, used for outputting low-temperature air to the ultra-high temperature solid-state heat storage device at a first flow rate;

[0009] The first flow rate is determined by the main air valve opening;

[0010] Ultra-high temperature solid-state heat storage device, used to heat low-temperature air and output high-temperature air;

[0011] an air mixing valve, used for outputting low-temperature air at a second flow rate;

[0012] The second flow rate is determined by the opening of the air mixing valve; the low-temperature air and the high-temperature air are mixed to obtain hot air;

[0013] Steam output pressure sensor, used to collect steam output pressure;

[0014] Hot air temperature sensor, used to collect hot air temperature;

[0015] The regulating module is used to compare the steam output pressure with the preset pressure threshold and adjust the main air valve opening according to the comparison result; and compare the hot air temperature with the preset temperature threshold and adjust the mixing air valve opening according to the comparison result; so as to keep the hot air at a constant temperature.

[0016] The present invention also provides a method for controlling a steam output system of an ultra-high temperature solid-state heat storage device, the steps of which are as follows:

[0017] Collect steam output pressure and hot air temperature;

[0018] The steam output pressure P1 and the pressure threshold P G Compare;

[0019] When the steam output pressure P1 is greater than the pressure threshold P G When the temperature is high, the main air valve opening is reduced; and a temperature comparison trigger signal is sent;

[0020] Or, when the steam output pressure P1 is less than the pressure threshold P G When the temperature is high, the main air valve opening is increased; and a temperature comparison trigger signal is sent;

[0021] After receiving the temperature comparison trigger signal, calculate the hot air temperature T1 and the temperature threshold T G The deviation of the temperature is obtained by ΔT.

[0022] The temperature deviation ΔT is the difference between the hot air temperature T1 and the temperature threshold T G The absolute value of the difference;

[0023] When the temperature deviation ΔT is greater than the preset temperature adjustment threshold ΔT G , and the hot air temperature T1 is greater than the temperature threshold T G When the temperature is high, increase the opening of the air mixing valve to keep the hot air at a constant temperature;

[0024] Alternatively, when the temperature deviation ΔT is greater than the preset temperature adjustment threshold ΔT G , and the hot air temperature T1 is less than the temperature threshold T G When heating, reduce the opening of the air mixing valve to keep the hot air at a constant temperature.

[0025] The beneficial effects of the present invention are:

[0026] The steam output system and control method of the ultra-high temperature solid-state heat storage device of the present invention utilizes a double air valve mixing air structure to convert the ultra-high temperature hot air output by the solid-state heat storage device into low-temperature constant temperature and constant volume hot air, thereby reducing the requirements on the material of the steam generating equipment, increasing the service life, and ensuring the stability of the output steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the steam output system of the ultra-high temperature solid-state heat storage device of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the electrical part of the steam output system of the ultra-high temperature solid-state heat storage device of the present invention;

[0029] Figure 3 This is a flow chart of a method for controlling a steam output system of an ultra-high temperature solid-state heat storage device of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention. Specific implementation method 1

[0034] The steam output system of the ultra-high temperature solid-state heat storage device of this embodiment includes a steam generating device 1, a fan 2, a main air valve 3, an ultra-high temperature solid-state heat storage device 4, an air mixing valve 5, a steam output pressure sensor 6, a hot air temperature sensor 7 and a regulating module 8;

[0035] The steam generating device 1 is used to output low-temperature air to the fan 2, and is also used to output steam and recover hot air;

[0036] The fan 2 is used to deliver low-temperature air to the main air valve 3 and the mixing air valve 5 respectively;

[0037] A main air valve 3, used for outputting low-temperature air at a first flow rate to the ultra-high temperature solid-state heat storage device 4;

[0038] The first flow rate is determined by the main air valve opening;

[0039] The ultra-high temperature solid-state heat storage device 4 is used to heat low-temperature air and output high-temperature air;

[0040] The air mixing valve 5 is used to output low-temperature air at a second flow rate;

[0041] The second flow rate is determined by the opening of the air mixing valve; the low-temperature air and the high-temperature air are mixed to obtain hot air;

[0042] Steam output pressure sensor 6, used to collect steam output pressure;

[0043] Hot air temperature sensor 7, used to collect hot air temperature;

[0044] The regulating module 8 is used to compare the steam output pressure with the preset pressure threshold and adjust the main air valve opening according to the comparison result; and compare the hot air temperature with the preset temperature threshold and adjust the mixing air valve opening according to the comparison result; so as to keep the hot air at a constant temperature.

[0045] Specifically, Figure 1 , 2 As shown, this embodiment includes a steam generating device 1, a fan 2, a main air valve 3, an ultra-high temperature solid-state heat storage device 4, an air mixing valve 5, a steam output pressure sensor 6, a hot air temperature sensor 7 and a regulating module 8.

[0046] The steam generating equipment 1, the fan 2, the main air valve 3, the ultra-high temperature solid-state heat storage device 4 and the air mixing valve 5 are connected by air ducts.

[0047] The low-temperature air output by the steam generating device 1 is divided into two paths after passing through the fan 2. The first path passes through the main air valve 3 and enters the ultra-high temperature solid-state heat storage device 4 to be heated into high-temperature air. The second path passes through the air mixing valve 5 and merges with the first path to form a constant temperature and constant amount of low-temperature air, i.e., hot air. The steam output pressure sensor 6 is arranged on the steam output pipeline of the steam generating device, and the hot air temperature sensor 7 at the steam generating device inlet is arranged on the hot air input pipeline of the steam generating device after the confluence. Specific implementation method 2

[0049] This embodiment is a further description of the first embodiment. In this embodiment, the regulating module 8 includes a pressure regulating unit and a temperature regulating unit:

[0050] The pressure regulating unit is used to adjust the steam output pressure P1 to the pressure threshold P G Compare;

[0051] When the steam output pressure P1 is greater than the pressure threshold P G When the temperature is high, the main air valve opening is reduced; and a temperature comparison trigger signal is sent to the temperature adjustment unit;

[0052] Or, when the steam output pressure P1 is less than the pressure threshold P G When the temperature is high, the main air valve opening is increased; and a temperature comparison trigger signal is sent to the temperature adjustment unit;

[0053] The temperature adjustment unit is used to calculate the hot air temperature T1 and the temperature threshold T after receiving the temperature comparison trigger signal.G The deviation of the temperature is obtained by ΔT.

[0054] The temperature deviation ΔT is the difference between the hot air temperature T1 and the temperature threshold T G The absolute value of the difference;

[0055] When the temperature deviation ΔT is greater than the preset temperature adjustment threshold ΔT G , and the hot air temperature T1 is greater than the temperature threshold T G When the temperature is high, increase the opening of the air mixing valve to keep the hot air at a constant temperature;

[0056] Alternatively, when the temperature deviation ΔT is greater than the preset temperature adjustment threshold ΔT G , and the hot air temperature T1 is less than the temperature threshold T G When heating, reduce the opening of the air mixing valve to keep the hot air at a constant temperature.

[0057] The other technical features of this embodiment are exactly the same as those of the first embodiment. Specific implementation method three

[0059] This embodiment is a further explanation of the second embodiment. In this embodiment, the pressure regulating unit is also used to calculate the steam output pressure P1 and the pressure threshold P G The deviation of the pressure is obtained by ΔP.

[0060] The pressure deviation ΔP is the difference between the steam output pressure P1 and the pressure threshold P G The absolute value of the difference;

[0061] When the pressure deviation ΔP is greater than the preset pressure regulation threshold ΔP G , and the steam output pressure P1 is greater than the pressure threshold P G When the temperature is high, the main air valve opening is reduced; and a temperature comparison trigger signal is sent to the temperature adjustment unit;

[0062] Alternatively, when the pressure deviation ΔP is greater than the preset pressure regulation threshold ΔP G , and the steam output pressure P1 is less than the pressure threshold P G When the temperature is low, the main air valve opening is increased; and a temperature comparison trigger signal is sent to the temperature adjustment unit.

[0063] Specifically, Figure 3 As shown, the steam output pressure sensor 6 is used to ensure the quality of the output steam. When the steam output pressure P1 is equal to the pressure threshold P G When the steam output pressure P1 is not equal to the pressure threshold P G The absolute value of the pressure difference ΔP exceeds the pressure regulation threshold ΔP G When the air is in high temperature, adjust the main air valve opening, otherwise keep the air valve opening unchanged.

[0064] Steam output pressure P1 and pressure threshold P G Adjustment can be made based on the difference, or according to the steam output pressure P1 and the pressure threshold P G The pressure adjustment threshold ΔP G Set up quite small.

[0065] The hot air temperature sensor 7 at the inlet of the steam generating device is used to ensure the hot air temperature. When the hot air temperature T1 is equal to the temperature threshold T G The temperature difference ΔT obtained by taking the absolute value of the difference exceeds the temperature adjustment threshold ΔT G When the air mixing valve is in low pressure, adjust the opening of the air mixing valve, otherwise keep the opening of the air mixing valve unchanged.

[0066] The overall process is:

[0067] When the system output steam demand does not change, fan 2 runs at a fixed frequency.

[0068] When the steam output pressure sensor 6 detects the output steam pressure deviation (the steam output pressure P1 is different from the pressure threshold P G The absolute value of the difference between G When the temperature of the air flow is high, the opening of the main air valve 3 is adjusted to change the heat output by the ultra-high temperature solid-state heat storage device 4, thereby affecting the temperature of the air after confluence. Otherwise, the opening of the main air valve 3 is kept unchanged.

[0069] When the hot air temperature sensor 7 at the steam generating device inlet detects the hot air temperature deviation after confluence (hot air temperature T1 and temperature threshold T G The absolute value of the difference) exceeds the temperature adjustment threshold ΔT G When the air mixing valve 5 is opened, adjust the opening of the air mixing valve 5 to ensure the air temperature after confluence, otherwise keep the opening of the air mixing valve 5 unchanged. Specific implementation method four

[0071] The control method of the steam system of the ultra-high temperature solid-state heat storage device of this embodiment is a further description of the steam system of the ultra-high temperature solid-state heat storage device of the third embodiment. In this embodiment, the steps are as follows:

[0072] Collect steam output pressure and hot air temperature;

[0073] The steam output pressure P1 and the pressure threshold P G Compare;

[0074] When the steam output pressure P1 is greater than the pressure threshold P G When the temperature is high, the main air valve opening is reduced; and a temperature comparison trigger signal is sent;

[0075] Or, when the steam output pressure P1 is less than the pressure threshold P G When the temperature is high, the main air valve opening is increased; and a temperature comparison trigger signal is sent;

[0076] After receiving the temperature comparison trigger signal, calculate the hot air temperature T1 and the temperature threshold T G The deviation of the temperature is obtained by ΔT.

[0077] The temperature deviation ΔT is the difference between the hot air temperature T1 and the temperature threshold T G The absolute value of the difference;

[0078] When the temperature deviation ΔT is greater than the preset temperature adjustment threshold ΔT G , and the hot air temperature T1 is greater than the temperature threshold T G When the temperature is high, increase the opening of the air mixing valve to keep the hot air at a constant temperature;

[0079] Alternatively, when the temperature deviation ΔT is greater than the preset temperature adjustment threshold ΔT G , and the hot air temperature T1 is less than the temperature threshold T G When heating, reduce the opening of the air mixing valve to keep the hot air at a constant temperature.

[0080] The other technical features of this embodiment are exactly the same as those of the third embodiment. Specific implementation method five

[0082] This embodiment is a further description of the fourth embodiment, and this embodiment also includes:

[0083] Calculate the steam output pressure P1 and the pressure threshold P G The deviation of the pressure is obtained by ΔP.

[0084] The pressure deviation ΔP is the difference between the steam output pressure P1 and the pressure threshold P G The absolute value of the difference;

[0085] When the pressure deviation ΔP is greater than the preset pressure regulation threshold ΔP G , and the steam output pressure P1 is greater than the pressure threshold P G When the temperature is high, the main air valve opening is reduced; and a temperature comparison trigger signal is sent;

[0086] Alternatively, when the pressure deviation ΔP is greater than the preset pressure regulation threshold ΔP G , and the steam output pressure O1 is less than the pressure threshold P G When the temperature reaches 0.05°C, the main air valve opening is increased and a temperature comparison trigger signal is sent.

[0087] The other technical features of this embodiment are exactly the same as those of embodiment 4. Specific implementation method 6

[0089] This embodiment is a further description of the fourth or fifth embodiment, and this embodiment also includes:

[0090] When the steam output pressure P1 is not equal to the pressure threshold P G When the alarm is triggered,

[0091] The other technical features of this embodiment are exactly the same as those of embodiment four or five. Specific implementation method seven

[0093] This embodiment is a further explanation of the sixth embodiment. In this embodiment, the pressure threshold P G 0.2Mpa~14Mpa, pressure adjustment threshold ΔP G 0.001Mpa~0.01Mpa;

[0094] Temperature threshold T G The temperature adjustment threshold ΔT is 180℃~600℃ G is 5℃.

[0095] The other technical features of this embodiment are exactly the same as those of embodiment six.

[0096] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the features of the various dependent claims and herein may be combined in a manner different from that described in the original claims. It should also be understood that the features described in conjunction with the individual embodiments may be used in other embodiments.

Claims

1. The steam output system of the ultra-high temperature solid-state heat storage device is characterized in that: It comprises a steam generating device (1), a fan (2), a main air valve (3), an ultra-high temperature solid-state heat storage device (4), an air mixing valve (5), a steam output pressure sensor (6), a hot air temperature sensor (7) and a regulating module (8); The steam generating device (1) is used to output low-temperature air to the fan (2), and is also used to output steam and recover hot air; The fan (2) is used to deliver low-temperature air to the main air valve (3) and the air mixing valve (5) respectively; The main air valve (3) is used to output low-temperature air to the ultra-high temperature solid-state heat storage device (4) at a first flow rate; The first flow rate is determined by the opening of the main air valve; The ultra-high temperature solid-state heat storage device (4) is used to heat low-temperature air and output high-temperature air; The air mixing valve (5) is used to output low-temperature air at a second flow rate; The second flow rate is determined by the opening of the air mixing valve; the low-temperature air and the high-temperature air are mixed to obtain hot air; The steam output pressure sensor (6) is used to collect the steam output pressure; The hot air temperature sensor (7) is used to collect the hot air temperature; The regulating module (8) is used to compare the steam output pressure with a preset pressure threshold and adjust the main air valve opening according to the comparison result; and to compare the hot air temperature with a preset temperature threshold and adjust the mixing air valve opening according to the comparison result, so as to maintain the hot air at a constant temperature.

2. The steam output system of the ultra-high temperature solid state heat storage device according to claim 1, characterized in that: The regulating module (8) includes a pressure regulating unit and a temperature regulating unit: The pressure regulating unit is used to adjust the steam output pressure P1 to the pressure threshold P G Compare; When the steam output pressure P1 is greater than the pressure threshold P G When the temperature is high, the main air valve opening is reduced; and a temperature comparison trigger signal is sent to the temperature adjustment unit; Alternatively, when the steam output pressure P1 is less than the pressure threshold P G When the temperature is high, the main air valve opening is increased; and a temperature comparison trigger signal is sent to the temperature adjustment unit; The temperature adjustment unit is used to calculate the hot air temperature T1 and the temperature threshold T after receiving the temperature comparison trigger signal. G The deviation of the temperature is obtained by ΔT. The temperature deviation ΔT is the difference between the hot air temperature T1 and the temperature threshold T G The absolute value of the difference; When the temperature deviation ΔT is greater than the preset temperature adjustment threshold ΔT G , and the hot air temperature T1 is greater than the temperature threshold T G When the temperature is high, increase the opening of the air mixing valve to keep the hot air at a constant temperature; Alternatively, when the temperature deviation ΔT is greater than the preset temperature adjustment threshold ΔT G , and the hot air temperature T1 is less than the temperature threshold T G When heating, reduce the opening of the air mixing valve to keep the hot air at a constant temperature.

3. The steam output system of the ultra-high temperature solid state heat storage device according to claim 2, characterized in that: The pressure regulating unit is also used to calculate the steam output pressure P1 and the pressure threshold P G The deviation of the pressure is obtained by ΔP. The pressure deviation ΔP is the pressure difference between the steam output pressure P1 and the pressure threshold P G The absolute value of the difference; And, when the pressure deviation ΔP is greater than the preset pressure regulation threshold ΔP G , and the steam output pressure P1 is greater than the pressure threshold P G When the temperature is high, the main air valve opening is reduced; and a temperature comparison trigger signal is sent to the temperature adjustment unit; Alternatively, when the pressure deviation ΔP is greater than the preset pressure regulation threshold ΔP G , and the steam output pressure P1 is less than the pressure threshold P G When the temperature reaches 0.040°C, the main air valve opening is increased; and a temperature comparison trigger signal is sent to the temperature adjustment unit.

4. The control method of the steam output system of the ultra-high temperature solid-state heat storage device according to claim 3 is characterized in that: Here are the steps: Collect steam output pressure and hot air temperature; The steam output pressure P1 and the pressure threshold P G Compare; When the steam output pressure P1 is greater than the pressure threshold P G When the temperature is high, the main air valve opening is reduced; and a temperature comparison trigger signal is sent; Alternatively, when the steam output pressure P1 is less than the pressure threshold P G When the temperature is high, the main air valve opening is increased; and a temperature comparison trigger signal is sent; After receiving the temperature comparison trigger signal, calculate the hot air temperature T1 and the temperature threshold T G The deviation of the temperature is obtained by ΔT. The temperature deviation ΔT is the difference between the hot air temperature T1 and the temperature threshold T G The absolute value of the difference; When the temperature deviation ΔT is greater than the preset temperature adjustment threshold ΔT G , and the hot air temperature T1 is greater than the temperature threshold T G When the temperature is high, increase the opening of the air mixing valve to keep the hot air at a constant temperature; Alternatively, when the temperature deviation ΔT is greater than the preset temperature adjustment threshold ΔT G , and the hot air temperature T1 is less than the temperature threshold T G When heating, reduce the opening of the air mixing valve to keep the hot air at a constant temperature.

5. The control method according to claim 4, characterized in that: Also includes: Calculate the steam output pressure P1 and the pressure threshold P G The deviation of the pressure is obtained by ΔP. The pressure deviation ΔP is the pressure difference between the steam output pressure P1 and the pressure threshold P G The absolute value of the difference; When the pressure deviation ΔP is greater than the preset pressure regulation threshold ΔP G , and the steam output pressure P1 is greater than the pressure threshold P G When the temperature is high, the main air valve opening is reduced; and a temperature comparison trigger signal is sent; Alternatively, when the pressure deviation ΔP is greater than the preset pressure regulation threshold ΔP G , and the steam output pressure P1 is less than the pressure threshold P G When the temperature reaches 0.05°C, the main air valve opening is increased and a temperature comparison trigger signal is sent.

6. The control method according to claim 4 or 5, characterized in that: Also includes: When the steam output pressure P1 is not equal to the pressure threshold P G When the alarm is triggered, 7. The control method according to claim 6, characterized in that: Pressure threshold P G 0.2Mpa~14Mpa, pressure adjustment threshold ΔP G 0.001Mpa~0.01Mpa; Temperature threshold T G The temperature adjustment threshold ΔT is 180℃~600℃ G is 5℃.

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