An ultra-high pressure steam boiler system utilizing off-peak electricity for heat storage and a regulation method thereof

Abstract

The application discloses a kind of superhigh pressure steam boiler system and regulation and control method using valley electricity heat storage, the system generates steam using electric heating self-pressurization, flash evaporation method, the system is six parts: water treatment module, high-pressure water heating, heat storage module, temperature and pressure reducing module, steam generation module, compensation heating module, pipeline connection and information transmission module;The application uses circulating water as energy storage medium, and stores the excess electric energy in the form of heat energy by electrically heating water, and produces industrial steam by controlling solenoid valve and steam flash valve.The application can be used as an electric energy transfer terminal, and converts valley electricity into heat energy and stores it in multiple parallel electric heating boilers.According to actual demand, the valve of the boiler is adjusted to obtain industrial steam, which is flexible to use.

Description

TECHNICAL FIELD

[0001] The application relates to an ultra-high pressure steam boiler system and a regulation method using valley electricity heat storage, and belongs to the field of industrial steam production. BACKGROUND

[0002] With the gradual increase of the proportion of wind and light in the power system, the importance and economic value of energy storage are gradually reflected. At present, the main force of industrial steam supply is still coal-fired boilers, and a small part is gas-fired boilers. Under the new energy policy of the country, the future tightening of carbon indicators is an inevitable trend, and the use of cleaner ways to supply industrial steam is the most challenging technical difficulty. As an energy-saving and efficiency-improving technology, heat pumps can use various industrial waste heat, air source, water source, soil, etc. as heat sources to produce 120 DEG C or so steam, and have high energy efficiency. In the field of small capacity and low parameter steam supply, it has certain development potential. However, for large-scale industrial applications, it is limited by the energy density and quality of the heat source of the heat pump, and when producing higher temperature steam, the energy efficiency is low and there are many technical bottlenecks. Therefore, large-scale steam supply or higher parameter (150 DEG C-200 DEG C) steam supply needs new technical approaches. At the same time, considering the future transfer of new energy consumption cost to industrial users and the gradual increase of peak-valley electricity difference, efficient use of valley electricity energy storage to produce industrial steam has economic and environmental value. SUMMARY

[0003] The application aims to provide an ultra-high pressure (4-16.5 MPa) steam boiler system using valley electricity heat storage, which involves user-side energy storage and replaces high-emission steam boilers using coal and gas as raw materials. The equipment, system and regulation method provided by the application store valley electricity in the latent heat of water in the form of high-temperature and high-pressure water (250 DEG C-350 DEG C), and release industrial steam of a given parameter through flash evaporation during peak electricity. The system provided by the application can realize modularization and integration, and the energy storage density can reach 560 kJ . kg –1 –1260 kJ . kg –1 , which is higher than that of general phase change energy storage (energy storage density is generally 200 kJ . kg –1 – 500 kJ . kg –1 ).

[0004] In the application, water is used as energy storage medium, surplus electric energy in low electricity consumption period is converted into heat energy, water in superhigh pressure boiler is heated to achieve energy storage effect, through electric heating self-pressurizing and flash evaporation method, water is converted into industrial steam, aiming at surplus electric energy of thermal power, nuclear power and hydroelectric power in power grid, the application is applied to deep peak regulation field of power grid, and peak regulation pressure of power grid can be reduced; aiming at fluctuation characteristics of wind power and light power in power grid, the variable power electric heating device can effectively consume wind power and light power, reduce abandonment rate of wind power and light power, and realize reasonable utilization of energy.

[0005] The application provides a superhigh pressure steam boiler system for storing heat by valley electricity, which comprises a water treatment module (A), a temperature and pressure reducing module (B), a high pressure water heating and storing module (C), a steam generating module (D), a compensation heating module (E) and a pipeline connection and information transmission module.

[0006] The pipeline connection and information transmission module is a connection and control module of the whole heat storage boiler system, and the module comprises a water channel, a steam channel, a signal channel, a common water pump, a high pressure pump, an electromagnetic valve, a flash evaporation electromagnetic valve, a liquid flowmeter, a gas flowmeter and a safety pressure relief valve, and the whole system is attached with a heat preservation layer. The common water pump is respectively arranged between a common water tank and a water treatment device and between the water treatment module and the temperature and pressure reducing module. The high pressure pump is a high pressure boiler feed water pump, wherein a first high pressure pump is arranged between the water treatment module and the high pressure water heating and storing module, and a second high pressure pump is arranged between the high pressure water heating and storing module and the steam generating module. The electromagnetic valve, the safety pressure relief valve, the flash evaporation electromagnetic valve and the flowmeter are more, and the distribution thereof will be introduced below. The valve, the flowmeter and the pump are connected with the water channel and the steam channel through flanges. The water channel and the steam channel are used for conveying water and steam, the signal channel is used for connecting pressure sensors, temperature sensors, liquid level gauges, pumps, electric heating devices and electromagnetic valves in the modules with a computer terminal, the computer terminal obtains data signals and controls opening and closing of the electromagnetic valves, starting and stopping of the pumps and the electric heating devices through the channel, and normal operation of the whole system is maintained.

[0007] The water treatment module comprises a common water tank, a water treatment device and a purified water tank. Municipal water is arranged in the common water tank, the water tank is connected with the water treatment device through a first electromagnetic valve and a first common water pump, the water treatment device is connected with the purified water tank, the purified water tank has two outlets and one inlet, the right outlet is connected with a second electromagnetic valve, the water treatment module is connected with the high pressure water heating and storing module through the electromagnetic valve and a first high pressure water pump, the lower outlet of the purified water tank is connected with a third electromagnetic valve, and the water treatment module is connected with the temperature and pressure reducing module through the electromagnetic valve, a first liquid flowmeter and a second common pump; and the left inlet is connected with the temperature and pressure reducing module through a third common water pump.

[0008] The high-pressure water heating and heat storage module contains N groups of electric heating units (N is 3-10000), and all the electric heating units are connected in parallel. The electric heating unit is composed of an electric heating boiler and its supporting equipment. Each unit of the electric heating boiler is connected with the supporting equipment in the same way. Taking one of the electric heating units as an example, the structure is described as follows: the electric heating boiler contains an electric heater inside, and the boiler body is wrapped with a heat preservation layer. The upper right part of the boiler body is connected with an electronic liquid level meter, a pressure sensor, a first temperature sensor and a second temperature sensor in sequence from top to bottom. The left side of the boiler body is connected with an in-situ liquid level meter. The upper part of the boiler body has a purified water inlet and a steam outlet. The purified water inlet is connected with a first liquid flow meter of the first electric heating boiler and a first electromagnetic valve of the first electric heating boiler. The electromagnetic valve controls the water supply of the first electric heating boiler. The purified water enters the electric heating boiler through a water channel composed of a first high-pressure pump, a second liquid flow meter, the electromagnetic valve, the first liquid flow meter of the first electric heating boiler and the water channel connected therewith. The steam outlet is connected with a first electromagnetic valve of the first electric heating boiler. The electromagnetic valve is used to control the discharge of the remaining steam in the boiler. The steam discharge passage of the first electric heating boiler is composed of the electromagnetic valve, a gas flow meter of the first electric heating boiler and a steam channel connected therewith. The lower part of the boiler body has a pressure relief port, a water outlet and a water inlet. The pressure relief port is controlled by a safety pressure relief valve. When overpressure occurs in the heating process, part of the water in the boiler can be discharged through the pressure relief valve, a third liquid flow meter and a first electronic flash evaporation valve to enter a temperature and pressure reducing module. The lower water outlet is connected with a third electromagnetic valve of the electric heating boiler. The water enters a steam generation module through a channel formed by the electromagnetic valve, a third liquid flow meter of the first electric heating boiler and a second flash evaporation electromagnetic valve. The lower water inlet is connected with a second liquid flow meter of the first electric heating boiler. The water in the steam generation module enters the electric heating boiler through a second high-pressure pump, a fourth electromagnetic valve of the first electric heating boiler and the flow meter. The first electronic liquid level meter is used to monitor the liquid level in the boiler. The first pressure meter is used to monitor the pressure in the boiler. The first temperature sensor is used to monitor the temperature in the boiler. The second temperature sensor is used to monitor the temperature outside the heat preservation layer to check the heat preservation effect. The in-situ liquid level meter can directly understand the liquid level condition in the tank.

[0009] The temperature and pressure reducing module includes a spraying device, a spraying tank liquid level meter and a spraying tank. The spraying device is installed in the top of the spraying tank body and is connected with a second ordinary water pump. The left side of the spraying tank is a water inlet, and the right side is a water outlet. The water inlet is connected with a first flash evaporation electromagnetic valve, and the water outlet is connected with a fourth electromagnetic valve. The water enters a purified water tank through the fourth electromagnetic valve and a third ordinary water pump. The lower side of the tank has a drain port connected with a fifth electromagnetic valve.

[0010] The water of the spray tank comes from a purified water tank and enters through a spraying device; the pressure relief water of the heating and heat storage module is flashed through a third liquid flow meter and a first flash electromagnetic valve to enter the spray tank in the form of steam.

[0011] A spray tank liquid level gauge is connected to the left side of the tank wall.

[0012] The steam generation module includes a flash tank, a flash tank insulation layer, a steam-water separator, a flash tank in-situ liquid level gauge, a flash tank electronic liquid level gauge, a first and a second flash tank temperature sensors and a flash tank pressure sensor. The upper outlet of the flash tank is provided with a steam-water separator for improving the steam dryness (dryness controlled at about 1), and the outside of the outlet is connected with a gas flow meter; the lower left side of the tank is sequentially provided with a water outlet and a drain (water in the water outlet enters the furnace body through a pipeline for the next heating cycle; when the system stops running, the water at the drain is discharged from the system through a seventh electromagnetic valve); the entire flash tank is wrapped with an insulation layer, and the side wall is provided with an in-situ liquid level gauge and an electronic liquid level gauge, a first and a second temperature sensors and a pressure sensor. Further, the electronic liquid level gauge transmits signals to a control end, and the electronic liquid level gauge is used for monitoring the liquid level in the tank; the in-situ liquid level gauge can directly understand the liquid level condition in the tank.

[0013] The compensation heating module includes a compensation heating tank, a compensation heating tank insulation layer, a compensation heating tank electric heater, a first and a second compensation heating tank temperature sensors and a compensation heating tank pressure sensor. The tank is provided with an electric heater, and the outside is wrapped with an insulation layer, and the left side wall surface is connected with the first and the second temperature sensors and the pressure sensor. The lower part of the flash tank is connected with the flash tank gas flow meter, and the upper part is connected with the electric compensation heating tank gas flow meter. Further, all the temperature sensors and the pressure sensor transmit signals to the control end, and the pressure meter is used for monitoring the pressure in the tank; the first temperature sensor is used for monitoring the temperature in the tank; the second temperature sensor is used for monitoring the temperature outside the insulation layer to check the insulation effect. The in-situ liquid level gauge can directly understand the liquid level condition in the tank.

[0014] The present application provides a control method of the above-mentioned ultra-high pressure steam boiler system using valley electricity heat storage, the working pressure of the electric heating boiler is 4 MPa - 16.5 MPa, the working pressure of the flash tank is 0.2 MPa - 2 MPa, and 120 ℃ - 220 ℃ industrial steam is generated. The water storage capacity of the electric heating boiler needs water, which needs to be calculated according to the volume of the furnace and the density of the target working condition saturated water, and 3% margin is left for operation safety.

[0015] The present application is applied to power plant peak shaving, converts excess electricity during valley electricity into heat energy form storage, and can provide industrial steam, realizes the consumption of clean energy, and saves energy.

[0016] The present application has the following beneficial effects:

[0017] (1) The excess electric energy during the valley electricity is stored in the form of heat energy, and the peak shaving demand of the power plant is met;

[0018] (2) The system can realize the consumption of clean energy, and save energy;

[0019] (4) The system can provide industrial steam to meet the demand of various industries for steam;

[0020] (5) The functions of each part of the system are controlled by the on-off of the electromagnetic valve, and the automatic operation is easy to realize;

[0021] (6) The system is a high-temperature and high-pressure working condition, and the energy storage density is much higher than that of general phase change energy storage. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the ultrahigh pressure steam boiler system of the embodiment 1.

[0023] In the figure: 1 - ordinary water tank 2 - municipal water 3 - first solenoid valve 4 - first ordinary water pump 5 - water treatment device 6 - purified water tank 7 - purified water 8 - third solenoid valve 9 - first liquid flowmeter 10 - second ordinary water pump 11 - sprinkling device 12 - sprinkling tank 13 - sprinkling tank level gauge 14 - steam desuperheating water 15 - first flash solenoid valve 16 - fourth solenoid valve 17 - third ordinary water pump 18 - first high pressure feed water pump 19 - second liquid flowmeter 20 - third liquid flowmeter 21 - first electric heating boiler gas flowmeter 22 - first electric heating boiler first solenoid valve 23 - first electric heating boiler second solenoid valve 24 - first electric heating boiler first liquid flowmeter 25 - first electric heating boiler local level gauge 26 - first electric heating boiler electronic level gauge 27 - first electric heating boiler pressure sensor 28 - first electric heating boiler first temperature sensor 29 - first electric heating boiler second temperature sensor 30 - first electric heating boiler insulation layer 31 - first electric heating boiler 32 - first electric heater 33 - first safety pressure relief valve 34 - first electric heating boiler third solenoid valve 35 - first electric heating boiler second liquid flowmeter 36 - first electric heating boiler third liquid flowmeter 37 - first electric heating boiler fourth solenoid valve 38 - second electric heating boiler gas flowmeter 39 - second electric heating boiler first solenoid valve 40 - second electric heating boiler second solenoid 41 - second electric heating boiler first liquid flowmeter 42 - second electric heating boiler local level gauge 43 - second electric heating boiler electronic level gauge 44 - second electric heating boiler pressure sensor 45 - second electric heating boiler first temperature sensor 46 - second electric heating boiler second temperature sensor 47 - second electric heating boiler insulation layer 48 - second electric heating boiler 49 - second electric heater 50 - second safety pressure relief valve 51 - second electric heating boiler third solenoid valve 52 - second electric heating boiler second liquid flowmeter 53 - second electric heating boiler third liquid flowmeter 54 - second electric heating boiler fourth solenoid valve 55 - third electric heating boiler gas flowmeter 56 - third electric heating boiler first solenoid valve 57 - third electric heating boiler second solenoid 58 - third electric heating boiler first liquid flowmeter 59 - third electric heating boiler local level gauge 60 - third electric heating boiler electronic level gauge 61 - third electric heating boiler pressure sensor 62 - third electric heating boiler first temperature sensor 63 - third electric heating boiler second temperature sensor 64 - third electric heating boiler insulation layer 65 - third electric heating boiler 66 - third electric heater 67 - third safety pressure relief valve 68 - third electric heating boiler third solenoid valve 69 - third electric heating boiler second liquid flowmeter 70 - third electric heating boiler third liquid flowmeter 71 - third electric heating boiler fourth solenoid valve 72 - Nth electric heating boiler gas flowmeter 73 -74 – First solenoid valve of the Nth electric heating boiler; 75 – Second solenoid valve of the Nth electric heating boiler; 76 – First liquid flow meter of the Nth electric heating boiler; 77 – Local liquid level gauge of the Nth electric heating boiler; 78 – Electronic liquid level gauge of the Nth electric heating boiler; 79 – Pressure sensor of the Nth electric heating boiler; 80 – First temperature sensor of the Nth electric heating boiler; 81 – Second temperature sensor of the Nth electric heating boiler; 82 – Insulation layer of the Nth electric heating boiler; 83 – Electric heater of the Nth electric heating boiler; 84 – Electric heater of the Nth electric heating boiler; 85 – Safety relief valve of the Nth electric heating boiler; 86 – Third solenoid valve of the Nth electric heating boiler; 87 – Second liquid flow meter of the Nth electric heating boiler; 88 – Third liquid flow meter of the Nth electric heating boiler. 89 – Fourth solenoid valve of the Nth electric heating boiler; 90 – Second flash solenoid valve; 91 – Gas flow meter of flash tank; 92 – Flash tank; 93 – Insulation layer of flash tank; 94 – Steam-water separator; 95 – Local level gauge of flash tank; 96 – Electronic level gauge of flash tank; 97 – Second high-pressure water pump; 98 – Gas flow meter of compensating heating tank; 99 – Pressure sensor of compensating heating tank; 100 – First temperature sensor of compensating heating tank; 101 – Electric heater of compensating heating tank; 102 – Second temperature sensor of compensating heating tank; 103 – Compensating heating tank; 104 – Insulation layer of compensating heating tank; 105 – Terminal controller; 106 – Fifth solenoid valve; 107 – Sixth solenoid valve; 108 – Seventh solenoid valve. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings, but is not limited to the following embodiments. The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention. The present invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise proportions, only for the purpose of conveniently and clearly illustrating the embodiments of the present invention. The operating parameters of the embodiments are shown in Table 1, the high-voltage energy storage property calculation table.

[0025] Example 1:

[0026] like Figure 1 As shown, the ultra-high pressure steam boiler system utilizing off-peak electricity for heat storage comprises six parts: a water treatment module (A), a desuperheating and pressure reduction module (B), a high-pressure water heating and heat storage module (C), a steam generation module (D), a compensating heating module (E), and a pipeline connection and information transmission module. Figure 1 As shown, the ultra-high pressure steam boiler system utilizing off-peak electricity for heat storage provided by this invention has the following detailed structural description:

[0027] The pipeline connection and information transmission module is a connection and control module of the whole heat storage boiler system, and the module comprises a water channel, a steam channel, a signal channel, a common water pump, a high-pressure pump, an electromagnetic valve, a flash electromagnetic valve, a liquid flow meter, a gas flow meter and a safety pressure relief valve. The whole system is attached with a heat preservation layer. The common water pump is respectively located between the common water tank and the water treatment equipment and between the water treatment module and the temperature and pressure reducing module. The high-pressure pump is a high-pressure boiler feed pump, wherein the first high-pressure pump is located between the water treatment module and the high-pressure water heating and heat storage module, and the second high-pressure pump is located between the high-pressure water heating and heat storage module and the steam generation module. The electromagnetic valve, the safety pressure relief valve, the flash electromagnetic valve and the flow meter are more, and their distribution will be introduced below. The valve, the flow meter and the pump are connected with the water channel and the steam channel by flanges. The water channel and the steam channel are used for conveying water and steam, the signal channel is used for connecting the pressure sensor, the temperature sensor, the liquid level meter, the pump, the electric heating device and the electromagnetic valve in each module with the computer terminal, the computer terminal obtains data signals and controls the opening and closing of the electromagnetic valve, the start and stop of the pump and the electric heating device through the channel, and the normal operation of the whole system is maintained.

[0028] The water treatment module A comprises a common water tank 1, a water treatment equipment 5 and a purified water tank 6. The common water tank 1 contains municipal water, and is connected with the water treatment equipment 5 through the first electromagnetic valve 3 and the first common water pump 4. The other end of the water treatment equipment 5 is connected with the purified water tank 6. The purified water tank 6 has two outlets and one inlet. The right outlet is connected with the second electromagnetic valve 7, and the water treatment module is connected with the high-pressure water heating and heat storage module C through the electromagnetic valve 7 and the first high-pressure water pump 19. The lower outlet of the purified water tank 6 is connected with the third electromagnetic valve 9, and is connected with the temperature and pressure reducing module B through the third electromagnetic valve 9, the first liquid flow meter 10 and the second common pump 11. The left inlet is connected with the temperature and pressure reducing module through the third common water pump.

[0029] The high-pressure water heating and heat storage module C contains N groups of electric heating units (N is 3-10000), all of which are connected in parallel. The electric heating unit is composed of an electric heating boiler and its supporting equipment. Each unit of electric heating boiler and supporting equipment is connected in the same way. Take the first electric heating boiler of the first electric heating unit as an example to describe the structure as follows: the first electric heating boiler 32 contains a first electric heater 33 inside, and the boiler body is wrapped with a heat preservation layer 31. The upper right part of the boiler body is connected to the first electric heating boiler electronic liquid level meter 27, the first electric heating boiler pressure sensor 28, the first electric heating boiler first temperature sensor 29, and the first electric heating boiler second temperature sensor 30 in turn. The left side of the boiler body is connected to the first electric heating boiler in-situ liquid level meter 26. There is a purified water inlet and a steam outlet above the boiler body. The purified water inlet is connected to the first electric heating boiler first liquid flow meter 25 and the first electric heating boiler first electromagnetic valve 23. The electromagnetic valve controls the water supply of the first electric heating boiler. The purified water enters the electric heating boiler through the first high-pressure water pump 19, the second liquid flow meter 20, the electromagnetic valve 23, the first electric heating boiler first liquid flow meter 25, and the water channel connected thereto. The steam outlet is connected to the first electric heating boiler second electromagnetic valve 24. The electromagnetic valve is used to control the discharge of the remaining steam in the boiler. The first electric heating boiler steam discharge passage is composed of the electromagnetic valve, the first electric heating boiler gas flow meter 22, and the steam channel connected thereto. There is a pressure relief port, a water outlet, and a water inlet below the electric heating boiler. The pressure relief port is controlled by the first safety relief valve 34. When overpressure occurs in the boiler body during the heating process, part of the water in the boiler can be discharged through the first safety relief valve 34, the third liquid flow meter 21, and the first electric heating boiler first flash electromagnetic valve 16 to enter the temperature and pressure reducing module. The lower water outlet is connected to the first electric heating boiler third electromagnetic valve 35. The water enters the steam generation module through the electromagnetic valve, the first electric heating boiler third liquid flow meter 37, and the second flash electromagnetic valve 90. The lower water inlet is connected to the first electric heating boiler second liquid flow meter 36. The water in the steam generation module enters the electric heating boiler through the second high-pressure water pump 97, the first electric heating boiler fourth electromagnetic valve 38, and the flow meter. Closing the second flash electromagnetic valve and opening the sixth electromagnetic valve 107 can discharge the water in the electric heating boiler. Further, all temperature sensors, pressure sensors, and electronic liquid level meters will transmit signals to the control end. The first electronic liquid level meter is used to monitor the liquid level in the tank. The first pressure meter is used to monitor the pressure in the tank. The first temperature sensor is used to monitor the temperature in the tank. The second temperature sensor is used to monitor the temperature outside the heat preservation layer to check the heat preservation effect. The in-situ liquid level meter can directly understand the liquid level condition in the tank.

[0030] The temperature and pressure reducing module comprises a spraying device 12, a spraying tank liquid level meter 14 and a spraying tank 13. The spraying device 12 is installed at the top of the spraying tank body and is connected with the second ordinary water pump 11. The right side of the spraying tank is a water inlet and the left side is a water outlet. The water inlet is connected with the first flash electromagnetic valve 16 and the water outlet is connected with the fourth electromagnetic valve 17. The water enters the purified water tank 6 through the fourth electromagnetic valve 17 and the third ordinary water pump 18. The lower side of the tank has a water outlet connected with the fifth electromagnetic valve 106.

[0031] The water of the spraying tank comes from the purified water tank and enters through the spraying device. The pressure relief water of the heating and heat storage module is flashed through the third liquid flow meter and the first flash electromagnetic valve to enter the spraying tank in the form of steam. The right side of the tank wall is connected with the spraying tank liquid level meter 14.

[0032] The steam generating module comprises a flash tank 92, a flash tank insulation layer 93, a steam-water separator 94, a flash tank in-situ liquid level meter 95, a flash tank electronic liquid level meter 96, a first and second temperature sensor of the flash tank and a flash tank pressure sensor. The upper outlet of the flash tank is provided with the steam-water separator 94 for improving the steam dryness (the dryness is controlled at about 1). The outlet is connected with the flash tank gas flow meter 91. The lower left side of the tank has a water outlet and a water outlet (the water of the water outlet enters the furnace body through the pipeline for the next heating cycle. When the system stops running, the water at the water outlet is discharged from the system through the seventh electromagnetic valve 108). The whole flash tank 92 is wrapped with the insulation layer. The side wall has the in-situ liquid level meter and the electronic liquid level meter, the first and second temperature sensors and the pressure sensor. Further, the electronic liquid level meter transmits signals to the control end. The electronic liquid level meter is used for monitoring the liquid level in the tank. The in-situ liquid level meter can directly understand the liquid level condition in the tank.

[0033] The compensation heating module comprises a compensation heating tank 103, a compensation heating tank insulation layer 104, a compensation heating tank electric heater 101, a first and second temperature sensor of the compensation heating tank and a pressure sensor 99. The tank is provided with an electric heater. The outside is wrapped with the insulation layer. The left side wall surface is connected with the first and second temperature sensors and the pressure sensor. The lower inlet of the flash tank is connected with the flash tank gas flow meter and the upper part is connected with the electric compensation heating tank gas flow meter. Further, all the temperature sensors and the pressure sensor transmit signals to the control end. The pressure meter is used for monitoring the pressure in the tank. The first temperature sensor is used for monitoring the temperature in the tank. The second temperature sensor is used for monitoring the temperature outside the insulation layer to check the insulation effect. The in-situ liquid level meter can directly understand the liquid level condition in the tank.

[0034] Before starting the whole system, make sure that all solenoid valves in the system are in the closed state. Table 1 is the high-pressure energy storage property calculation table. The working pressure of the electric heating boiler is 4 MPa - 16.5 MPa, the working pressure of the flash tank is 0.2 MPa - 2 MPa, and 120 ℃ - 220 ℃ industrial steam is generated. The water capacity of the electric heating boiler needs water, which needs to be calculated according to the volume of the tank and the density of the saturated water at the target working condition, and 3% margin is left for safe operation.

[0035] Table 1 High-pressure energy storage property calculation table

[0036]

[0037] The ultra-high pressure steam boiler system provided in the embodiment has the following regulation process:

[0038] (1) Open the first solenoid valve and the first ordinary water pump. The municipal water in the ordinary water tank enters the water treatment equipment through the first solenoid valve and the first ordinary water pump, and is transported to the purified water tank for standby after being purified to meet the boiler use requirements. After the purified water tank is fully replenished, close the first solenoid valve and the first ordinary water pump, open the second solenoid valve, the first solenoid valve of the first to N electric heating boilers and the first high-pressure feed water pump, and replenish water to all electric heating boilers. Monitor through the flow meter, and when the water quantity in each tank body reaches the full load mass of the corresponding working condition, close the above-mentioned solenoid valves and stop the first high-pressure pump.

[0039] (2) Open the fourth solenoid valve and the first flash solenoid valve, start the electric heating boiler to heat the water, and strictly control the pressure in the tank body at the target working condition. If overpressure occurs in the tank body, part of the water in the tank will be discharged into the spray tank through the safety relief valve connected thereto, the third liquid flow meter and the first flash valve, the spray device sprays according to the amount of high-pressure water discharged, and the flashed water vapor is quickly cooled to low-temperature water, which is then transported back to the purified water tank by the second ordinary water pump.

[0040] (3) When the water temperature in the electric heating boiler is the target working condition saturation temperature, stop heating, open the first electric heating boiler third solenoid valve, second flash evaporation solenoid valve, the saturated water in the first electric heating boiler passes through the first electric heating boiler third solenoid valve, the first electric heating boiler second liquid flowmeter, the second flash evaporation solenoid valve and enters the flash tank to start evaporation, the steam passes through the steam-water separator and the flash tank gas flowmeter and enters the electric compensation heating module, and the steam is heated to become industrial steam along the way. When the water in the first electric heating boiler is exhausted, close the first electric heating boiler third solenoid valve, open the first electric heating boiler second and fourth solenoid valves and the second electric heating boiler third solenoid valve, control the saturated water in the second electric heating boiler to flow out, pass through the solenoid valve, the second electric heating boiler second liquid flowmeter and the second flash valve and enter the flash tank to generate steam. To keep the liquid level in the flash tank constant, start the second high-pressure feed water pump to transport the saturated water in the flash tank into the first electric heating boiler. With the increase of the liquid level in the boiler, the residual steam in the tank is combined with the steam generated by the flash tank through the first electric heating boiler second solenoid valve and the first electric heating boiler gas flowmeter, and enters the compensation heating module to become industrial steam. When the second electric heating boiler exhausts the water in the tank, close the first electric heating boiler fourth solenoid valve and the second electric heating boiler third solenoid valve, open the first electric heating boiler first solenoid valve, the second electric heating boiler second and fourth solenoid valves and the third electric heating boiler third solenoid valve, stop the flash tank from supplementing water to the first electric heating boiler, and record the mass of the water in the first electric heating boiler at this time. Start the first high-pressure feed water pump to supplement water to the first electric heating boiler through the first electric heating boiler first solenoid valve and the first liquid flowmeter. When the mass of the water in the first electric heating boiler is 97% of the mass of the target working condition full load state (3% space margin), close the first electric heating boiler first and second solenoid valves and the first high-pressure feed water pump, and the water supplementing of the first electric heating boiler is completed. At the same time, the water in the third electric heating boiler enters the flash tank through the third electric heating boiler third solenoid valve, the third electric heating boiler second liquid flowmeter and the second flash solenoid valve, the second high-pressure feed water pump transports the saturated water in the flash tank into the second electric heating boiler, the residual steam in the tank is combined with the steam generated by the flash tank through the tenth solenoid valve and the second gas flowmeter, and enters the electric compensation heating module to become industrial steam. The subsequent operation logic is consistent with the above. When the water in the Nth electric heating boiler is exhausted, close all solenoid valves and the second high-pressure feed water pump, open the Nth electric heating boiler first and second solenoid valves, start the first high-pressure feed water pump, supplement water to the Nth electric heating boiler, and discharge the steam in the tank through the Nth electric heating boiler first solenoid valve and the Nth gas flowmeter to enter the compensation heating module to generate industrial steam. Monitor through the flowmeter until the mass of the water in the boiler is 97% of the mass of the target working condition full load state, close all solenoid valves and the first high-pressure feed water pump, and the water supplementing of the Nth electric heating boiler is completed. At this time, all tank bodies are supplemented with water, and the next heating begins.

[0041] (4) When the system is shut down, stop heating first, then close all valves.

[0042] (5) When draining, open all the fourth solenoid valve, fifth to seventh solenoid valves of the electric heating boiler to drain the water in the flash tank, electric heating boiler and flash tank.

[0043] The above is only the preferred embodiment of the present application, and does not limit the present application in any form; any person skilled in the art can easily implement the present application according to the drawings and the above; however, any slight modification, modification and evolution of the equivalent changes made by the person skilled in the art without departing from the technical solution of the present application, using the above disclosed technical content, are equivalent embodiments of the present application; at the same time, any equivalent change, modification and evolution of the above embodiments according to the essence of the present application are still within the protection scope of the technical solution of the present application.

Claims

1. A superhigh-pressure steam boiler system utilizing off-peak electricity for heat storage, characterized by: The system can be applied to power plant peak shaving, adopts circulating water as energy storage medium, stores the excess power during valley power period in the form of heat energy by electrically heating water, and generates industrial steam by controlling electromagnetic valve and steam flash valve; the system as a power transfer terminal converts valley power into heat energy and stores in multiple parallel electric heating boilers, and adjusts the valve of the boiler according to actual demand to obtain industrial steam; The super-high pressure steam boiler system comprises a water treatment module (A), a temperature and pressure reducing module (B), a high-pressure water heating and storing module (C), a steam generating module (D), a compensation heating module (E) and a pipeline connection and information transmission module; The pipeline connection and information transmission module is a connection and control module of the whole heat storage boiler system, and comprises a water channel, a steam channel, a signal channel, an ordinary water pump, a high-pressure pump, an electromagnetic valve, a flash electromagnetic valve, a liquid flowmeter, a gas flowmeter and a safety pressure relief valve, and the whole system is attached with an insulation layer; the pipeline connection and information transmission module is used for transmitting water and steam, so that the whole system can stably operate; The water treatment module processes tap water into water meeting the water quality requirement for entering the boiler system; the water treatment module comprises an ordinary water tank, a water treatment device and a purified water tank; The high-pressure water heating and storing module is used for heating the purified water into high-temperature and high-pressure water of a target working condition; the high-pressure water heating and storing module comprises N groups of electric heating units, and N is 3-10000; all the electric heating units are connected in parallel; the electric heating unit is composed of an electric heating boiler and matched devices, and each unit electric heating boiler and matched device are connected in the same way; The temperature and pressure reducing module is used for reducing the temperature of the super-pressure and high-temperature water generated by the high-pressure water heating and storing module; the temperature and pressure reducing module comprises a spraying device, a spraying tank liquid level meter and a spraying tank; The steam generating module is used for flashing the water generated by the high-pressure water heating and storing module into steam; the steam generating module comprises a flash tank, a flash tank insulation layer, a steam-water separator, a flash tank in-situ liquid level meter, a flash tank electronic liquid level meter, first and second temperature sensors of the flash tank and a flash tank pressure sensor; The compensation heating module is used for compensating the heat loss of steam during transportation to become required industrial steam; the compensation heating module comprises a compensation heating tank, a compensation heating tank insulation layer, a compensation heating tank electric heater, first and second temperature sensors of the compensation heating tank and a compensation heating tank pressure sensor; The system can be applied to power plant peak shaving, adopts circulating water as energy storage medium, stores the excess power during valley power period in the form of heat energy by electrically heating water, and generates industrial steam by controlling electromagnetic valve and steam flash valve; the system as a power transfer terminal converts valley power into heat energy and stores in multiple parallel electric heating boilers, and adjusts the valve of the boiler according to actual demand to obtain industrial steam; The pipeline connection and information transmission module, ordinary water pump is located between ordinary water tank and water treatment equipment and water treatment module and pressure reducing module between; High pressure pump is used high pressure boiler feed water pump, wherein the first high pressure pump is located between water treatment module and high pressure water heating, heat storage module, the second high pressure pump is located between high pressure water heating, heat storage module and steam generation module;Valve, flow meter and pump and water channel and steam channel adopt flange connection;Water channel and steam channel are used for conveying water and steam, signal channel ensures that the pressure, temperature sensor, liquid level meter, pump, electric heating device and solenoid valve in each module are connected with computer terminal, computer terminal obtains data signal and controls solenoid valve opening and closing, start and stop of pump and electric heating device, maintains normal operation of the whole system; The water treatment module, the ordinary water tank is municipal water, the water tank is connected with water treatment equipment through the first electromagnetic valve and the first ordinary water pump, the other end of the water treatment equipment is connected with the purified water tank, the purified water tank has two outlets and one inlet, the right outlet is connected with the second electromagnetic valve, and the water treatment module is connected with the high pressure water heating and heat storage module through the electromagnetic valve and the first high pressure water pump;The lower outlet of the purified water tank is connected with the third electromagnetic valve, and the water treatment module is connected with the pressure reducing module through the electromagnetic valve, the first liquid flow meter and the second ordinary pump;The left inlet is connected with the pressure reducing module through the third ordinary water pump; The pressure reducing module, the spraying device is installed in the top of the spraying tank, and is connected with the second ordinary water pump;The left side of the spraying tank is the water inlet, and the right side is the water outlet, the water inlet is connected with the first flash electromagnetic valve, and the water outlet is connected with the fourth electromagnetic valve, and the water enters the purified water tank through the fourth electromagnetic valve and the third ordinary water pump;The lower side of the tank has a drain, which is connected with the fifth electromagnetic valve;The water of the spraying tank comes from the purified water tank and enters through the spraying device;The pressure relief water of the heating and heat storage module is flashed through the third liquid flow meter and the first flash electromagnetic valve, and enters the spraying tank in the form of steam;The left side of the tank wall is connected with the spraying tank liquid level meter.

2. The ultra-high pressure steam boiler system utilizing off-peak heat storage according to claim 1, characterized by: The high-pressure water heating, heat storage module, one electric heating unit structure as follows: electric heating boiler contains electric heater, the furnace body is outside with heat preservation layer, the furnace body right upper portion is connected with electronic liquid level meter, pressure sensor, first temperature sensor, second temperature sensor in turn from top to bottom; the furnace body left side is connected with just-in-place liquid level meter; the furnace body top has a purified water inlet and steam outlet, the purified water inlet is connected with first electric heating boiler first liquid flow meter and first electric heating boiler first electromagnetic valve, this electromagnetic valve controls first electric heating boiler water replenishment, the purified water enters the electric heating boiler through first high-pressure pump, second liquid flow meter, this electromagnetic valve, first electric heating boiler first liquid flow meter group and the water channel connected therewith; the steam outlet is connected with first electric heating boiler first electromagnetic valve, this electromagnetic valve is used for controlling the remaining steam in the furnace to be discharged, the first electric heating boiler steam discharge passage is composed of the electromagnetic valve, first electric heating boiler gas flow meter and the steam channel connected therewith; the furnace body lower portion has pressure relief port, water outlet and water inlet, the pressure relief port is controlled by safety pressure relief valve, when overpressure occurs in the heating process, part of the water in the furnace is discharged from the first pressure relief valve, enters the temperature and pressure reducing module through the passage composed of the pressure relief valve, third liquid flow meter and first electric heating boiler first electronic flash evaporation valve; the lower water outlet is connected with the third electromagnetic valve of the electric heating boiler, enters the steam generation module through the passage formed by the electromagnetic valve, first electric heating boiler third liquid flow meter and second flash evaporation electromagnetic valve; the lower water inlet is connected with the second liquid flow meter of the first electric heating boiler, the water in the steam generation module enters the electric heating boiler through the second high-pressure pump, first electric heating boiler fourth electromagnetic valve and the flow meter, closes the second steam flash evaporation valve, and opens the sixth electromagnetic valve to discharge the water in the electric heating boiler.

3. The ultra-high pressure steam boiler system utilizing off-peak heat storage according to claim 1, characterized by: In the steam generation module, the upper outlet of the flash tank is provided with a steam-water separator for improving steam dryness, and the outside of the outlet is connected with a gas flow meter; the left lower side of the tank is sequentially provided with a water outlet and a drain outlet, and the water outlet is connected with a pipeline to enter the furnace body for the next heating cycle; when the system stops running, the water at the drain outlet is discharged from the system through the seventh electromagnetic valve; the entire flash tank is wrapped with a heat preservation layer, and the side wall is provided with a just-in-place liquid level meter and an electronic liquid level meter, first and second temperature sensors and a pressure sensor.

4. The ultra-high pressure steam boiler system utilizing off-peak heat storage according to claim 1, characterized by: In the compensation heating module, an electric heater is arranged in the compensation heating tank, and the outside is wrapped with a heat preservation layer, and the left side wall surface is connected with first and second temperature sensors and a pressure sensor; the lower inlet of the compensation heating tank is connected with the gas flow meter of the flash tank, and the upper portion is connected with the gas flow meter of the electric compensation heating tank.

5. The ultra-high pressure steam boiler system utilizing off-peak heat storage according to any one of claims 2 to 4, characterized in that: The temperature sensor, pressure sensor and electronic liquid level meter all transmit signals to the control end, the first electronic liquid level meter is used for monitoring the liquid level in the furnace; the first pressure gauge is used for monitoring the pressure in the furnace; the first temperature sensor is used for monitoring the temperature in the furnace; the second temperature sensor is used for monitoring the temperature outside the heat preservation layer to check the heat preservation effect; the just-in-place liquid level meter can directly understand the liquid level condition in the tank.

6. The method of regulating the ultra-high pressure steam boiler system using off-peak electricity for heat storage according to any one of claims 1 to 5, characterized in that The method comprises the following steps: (1) open the first electromagnetic valve, the first ordinary water pump, the municipal water in the ordinary water tank into the water treatment equipment through the first electromagnetic valve and the first ordinary water pump, the water is purified to meet the requirements of the boiler and transported to the purified water tank for standby, after the purified water tank is replenished, the first electromagnetic valve and the first ordinary water pump are closed, the second electromagnetic valve, the first to N electric heating boiler first electromagnetic valve and the first high pressure feed water pump are opened, water is supplied to all electric heating boilers, and the flow meter is monitored. When the water quantity in each tank reaches the full load mass of the corresponding working condition, the above-mentioned electromagnetic valve is closed and the first high pressure pump is stopped; (2) open the fourth electromagnetic valve and the first flash evaporation electromagnetic valve, start the electric heating boiler to heat the water, and strictly control the pressure in the tank body at the target working condition. If overpressure occurs in the tank body, part of the water in the tank will be discharged into the spray tank through the safety relief valve connected thereto, the third liquid flow meter and the first flash evaporation valve. The spraying device sprays according to the amount of high pressure water discharged, the flashed water vapor is rapidly cooled into low temperature water, and then is transported back to the purified water tank through the second ordinary water pump. (3) When the water temperature in the electric heating boiler is the target working condition saturation temperature, stop heating, open the first electric heating boiler third solenoid valve, second flash evaporation solenoid valve, the saturated water in the first electric heating boiler passes through the first electric heating boiler third solenoid valve, the first electric heating boiler second liquid flowmeter, the second flash evaporation solenoid valve and enters the flash tank to start evaporation, the steam passes through the steam-water separator and the flash tank gas flowmeter and enters the electric compensation heating module, and the steam is heated to become industrial steam after compensating for the heat loss along the way; when the water in the first electric heating boiler is exhausted, close the first electric heating boiler third solenoid valve, open the first electric heating boiler second and fourth solenoid valves and the second electric heating boiler third solenoid valve, control the saturated water in the second electric heating boiler to flow out, pass through the solenoid valve, the second electric heating boiler second liquid flowmeter and the second flash valve and enter the flash tank to generate steam; in order to keep the liquid level in the flash tank constant, the second high-pressure feed water pump is started at the same time of the flash evaporation to transport the saturated water in the flash tank into the first electric heating boiler; with the increase of the liquid level in the boiler, the residual steam in the tank is combined with the steam generated by the flash tank through the first electric heating boiler second solenoid valve and the first electric heating boiler gas flowmeter, and enters the compensation heating module to become industrial steam; when the second electric heating boiler exhausts the water in the tank, close the first electric heating boiler fourth solenoid valve and the second electric heating boiler third solenoid valve, open the first electric heating boiler first solenoid valve, the second and fourth solenoid valves of the second electric heating boiler and the third solenoid valve of the third electric heating boiler, stop the flash tank from supplementing water to the first electric heating boiler, and the system records the mass of the water in the first electric heating boiler at this time; start the first high-pressure feed water pump to supplement water to the first electric heating boiler through the first electric heating boiler first solenoid valve and the first liquid flowmeter, and monitor through the flowmeter; when the mass of the water in the first electric heating boiler is 97% of the mass of the target working condition full load state, close the first electric heating boiler first and second solenoid valves and the first high-pressure feed water pump, and the first electric heating boiler is fully watered; at the same time, the water in the third electric heating boiler enters the flash tank for flash evaporation through the third electric heating boiler third solenoid valve, the third electric heating boiler second liquid flowmeter and the second flash solenoid valve, the second high-pressure feed water pump transports the saturated water in the flash tank into the second electric heating boiler, the residual steam in the tank is combined with the steam generated by the flash tank through the tenth solenoid valve and the second gas flowmeter, and enters the electric compensation heater heating module to become industrial steam, and the subsequent operation logic is consistent with the above; when the water in the Nth electric heating boiler is exhausted, close all solenoid valves and the second high-pressure feed water pump, open the first and second solenoid valves of the Nth electric heating boiler, start the first high-pressure feed water pump, supplement water to the Nth electric heating boiler, and discharge the steam in the tank, enter the compensation heating module to generate industrial steam through the Nth electric heating boiler first solenoid valve and the Nth gas flowmeter, and monitor through the flowmeter; when the mass of the water in the boiler is 97% of the mass of the target working condition full load state, close all solenoid valves and the first high-pressure feed water pump, and the Nth electric heating boiler is fully watered; at this time, all tanks are fully watered, and the next heating starts. (4) When the system is shut down, stop heating first, then close all valves; (5) When draining, open the fourth solenoid valve of the electric heating boiler, the fifth to seventh solenoid valves to drain the flash tank, the electric heating boiler and the water in the flash tank. 7.The method for regulating a superhigh-pressure steam boiler system using off-peak heat storage according to claim 6, characterized in that: The working pressure of the electric heating boiler is 4 MPa - 16.5 MPa, and the working pressure of the flash tank is 0.2 MPa - 2 MPa, producing 120 ℃ - 220 ℃ industrial steam.

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