Green power full-absorption type solid electric heat storage boiler-electrode boiler composite system and method

Abstract

The invention discloses a green power full-absorption type solid electric heat storage boiler-electrode boiler composite system and method, relates to the technical field of oil production engineering, and aims to solve the problems of insufficient green power absorption, equipment scaling corrosion and system capacity configuration. The system comprises a solid heat storage preheating section, an evaporation section, a solid heat storage overheating section, a heat preservation water tank, a steam heat accumulator and the like, the medium flow is monitored through a flow controller and a flow meter, and a fan set cooling system guarantees fan heat dissipation of the solid heat storage preheating section and the solid heat storage overheating section. According to the establishment method, the power proportion, the heat exchange amount, the mass of a heat accumulator and the volumes of a heat preservation water tank and a steam heat accumulator are determined based on a green power output curve; according to the working method, multiple modes are switched according to the input power of the green power system. The system can fully consume green electricity, provides stable steam, avoids scaling corrosion, and is adaptive to green electricity fluctuation scenes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil production engineering, in particular to a green electricity full consumption and absorption type solid electric heat storage boiler-electrode boiler composite system and method. BACKGROUND

[0002] When heavy oil (viscosity at room temperature is 10 4 -10 6 mPa・s) is exploited, the conventional exploitation recovery rate is less than 10% due to poor flowability. The existing process injects high-temperature steam (pressure 10-25 MPa, temperature 280-350℃ of superheated steam) into the bottom layer, and through heat conduction and viscosity shear thinning effect, the viscosity of heavy oil can be reduced to below 100 mPa・s, so as to greatly improve the flowability. The traditional steam generation relies on natural gas, which causes serious waste of oil and gas resources. With the development of new energy, the mode of generating high-temperature steam by using solid heat storage boiler in the way of green electricity such as wind power generation and photovoltaic power generation gradually replaces the traditional mode.

[0003] However, the electric energy generated by the green electricity system is unstable, and the existing solid heat storage boiler system can only use the green electricity after peak shaving, but cannot be directly connected with the green electricity system, and can only use part of the electric energy generated by the green electricity system during the time period when the green electricity output is high, and cannot fully consume and absorb the electric energy generated by the green electricity system.

[0004] In addition, the water used in oilfield heating is usually produced water or underground water, which can meet the basic use after conventional purification, but the content of ions such as calcium, magnesium and silicate in the water body is high. Under high temperature and high pressure conditions, ions can accelerate equipment corrosion and easily crystallize to form scale, which adheres to the inner wall of the steam generator and the injection steam pipe network, reduces the heat exchange efficiency, blocks the injection channel, and even causes safety accidents, which seriously affects the stability and economy of heavy oil thermal recovery. In the process of water becoming superheated steam, the scaling and corrosion problem in the superheated section is the most serious. In order to solve this problem, the existing technology of solid heat storage boiler adopts a superheated steam back-mixing process, the principle of which is that the purified and softened water is heated to a saturated state (water + water vapor), the water vapor is separated from the water by a steam-water separator, the water vapor is further heated to be superheated, mixed with water by a mixing device, and then injected into the steam pipe. However, this process only avoids the scaling and corrosion problem in the superheated section, reduces the plugging and pipe explosion problem during the operation of the boiler, but does not reduce the ion content in the outlet steam, resulting in structure and corrosion problems of the injection pipe and downhole insulation pipe. SUMMARY

[0005] In view of the problems in the prior art, the present application provides a green electricity full consumption type solid electric heat storage boiler-electrode boiler composite system and method, which provides continuous and stable steam while fully consuming electric energy of the green electricity-electric boiler system, solves the problems of blockage of the solid heat storage boiler and the gas injection pipeline due to scale in the superheating section, affects the efficiency, and even causes safety accidents, and solves the capacity configuration problem in the scenario of simultaneous use of the solid heat storage boiler and the electrode boiler.

[0006] The following technical solutions are specifically adopted: A green electricity full consumption type solid electric heat storage boiler-electrode boiler composite system, comprising: a solid heat storage preheating section, a vaporization section, a solid heat storage superheating section, a heat preservation water tank, a steam accumulator, a fan group cooling system, a plurality of flow controllers, a plurality of flow meters, and a three-way control valve. The inlet of the solid heat storage preheating section is connected with an external water supply pipe, the outlet of the solid heat storage preheating section is connected with the inlet of the heat preservation water tank, the outlet of the heat preservation water tank is connected with the inlet of the electrode boiler, the vaporization section is the electrode boiler, the outlet of the electrode boiler is communicated with the three-way control valve, the two outlets of the three-way control valve are respectively connected with the inlet of the steam accumulator and the inlet of the solid heat storage superheating section, the outlet of the steam accumulator is connected with the outlet of the electrode boiler, for storing excess steam generated by the electrode boiler, the outlet of the solid heat storage superheating section outputs superheated steam and injects into a gas injection pipeline; the fan group cooling system is used for cooling and dissipating heat of the fans in the solid heat storage preheating section and the solid heat storage superheating section. The plurality of flow meters and the plurality of flow controllers are used for monitoring and controlling the water flow and the steam flow in the system.

[0007] Further, the plurality of flow controllers comprise: a first flow controller, a second flow controller, a third flow controller, and a fourth flow controller, the first flow controller is arranged at the inlet of the solid heat storage preheating section and is used for controlling the water flow entering the solid heat storage preheating section; the second flow controller is arranged on a pipeline communicated between the heat preservation water tank and the electrode boiler and is used for controlling the water flow entering the electrode boiler; the third flow controller is arranged on a pipeline communicated between the electrode boiler and the three-way control valve and is used for controlling the steam flow delivered by the electrode boiler to the solid heat storage superheating section; and the fourth flow controller is arranged on a pipeline communicated between the steam accumulator and the three-way control valve and is used for controlling the steam flow delivered by the steam accumulator to the superheating heat exchanger. The several flow meters include: a first flow meter, a second flow meter, a third flow meter and a fourth flow meter, the first flow meter is arranged at the inlet of the solid heat storage preheating section, and is used for recording the water flow entering the solid heat storage preheating section, the second flow meter is arranged on the pipeline communicated between the heat preservation water tank and the electrode boiler, and is used for recording the water flow entering the electrode boiler, the third flow meter is arranged on the pipeline communicated between the steam heat accumulator and the electrode boiler, and is used for recording the steam flow of the steam heat accumulator entering the electrode boiler, and the fourth flow meter is arranged on the pipeline communicated between the three-way control valve and the solid heat storage superheating section.

[0008] Further, the solid heat storage preheating section includes: a preheating heat exchanger, a first fan and a preheating section solid electric heat storage boiler, the preheating section solid electric heat storage boiler is connected with the air side inlet and outlet of the preheating heat exchanger through two high-temperature air conveying pipelines, the first fan is connected in series on one of the high-temperature air conveying pipelines, and is used for blowing the heated air of the preheating section solid electric heat storage boiler into the preheating heat exchanger, the medium side inlet of the preheating heat exchanger is connected with an external water pipe, and the medium side outlet of the preheating heat exchanger is connected with the heat preservation water tank. The solid heat storage superheating section includes: a superheating heat exchanger, a second fan and a superheating section solid electric heat storage boiler, the superheating section solid electric heat storage boiler is connected with the air side inlet and air side outlet of the superheating heat exchanger through two high-temperature air conveying pipelines, the second fan is connected in series on one of the high-temperature air conveying pipelines, and is used for blowing the high-temperature air of the superheating section solid electric heat storage boiler into the superheating heat exchanger, the medium side inlet of the superheating heat exchanger is connected with the three-way control valve, and the medium side outlet of the superheating heat exchanger is connected with an external steam pipe network.

[0009] Further, the fan group cooling system includes: a radiator, a liquid cooling pipeline and a circulating pump, the first fan, the second fan, the radiator and the circulating pump are connected in series on the liquid cooling pipeline, and are used for cooling and cooling the first fan and the second fan.

[0010] A method for establishing a green electricity full consumption and absorption type solid electric heat storage boiler-electrode boiler composite system, based on any of the composite systems, the steps include: S1, collecting the green electricity power supplied to the boiler system in a typical day 0-24 h under a unified time interval, and fitting a green electricity output curve , obtaining the green electricity daily power generation in the oil area , according to the green electricity daily power generation in the oil area , obtaining the average output of the green electricity system in a day , combining the initial state specific enthalpy , the final state specific enthalpy and the thermal efficiency of the composite system to obtain the mass flow of the required water ; S2, according to the green electricity output curve , get the green electricity output fluctuation coefficient within a day , or , or and the proportion of photovoltaic power output in green electricity is greater than 50%, the composite system is adopted; S3, if , the power ratio of the solid heat storage preheating section, the electrode boiler and the solid heat storage superheating section is set to 3:2:1, if and the proportion of photovoltaic power output in green electricity is greater than 50%, the power ratio of the solid heat storage preheating section, the evaporation section and the solid heat storage superheating section is set to 3:3:1; based on the maximum value of green electricity output and the power ratio, the heat exchange capacity of the preheating section solid electric heat storage boiler, the superheating section solid electric heat storage boiler and the electrode boiler is obtained respectively, and , the rated power of the evaporation section is , if and the proportion of photovoltaic power output in green electricity is greater than 50%, the rated power of the evaporation section is ; S4, according to the heat exchange capacity of the preheating section, the superheating section and the electrode boiler, the specific heat capacity of the heat storage material and the temperature change range of the heat storage material, the mass of the solid heat storage preheating section and the solid heat storage superheating section is obtained respectively. According to the average power of the electrode boiler, the rated volume of the heat preservation water tank and the steam accumulator is obtained, and the composite system is finally completed.

[0011] Further, in S1, the daily power generation of green electricity in the oil area is: ; In the formula, is the real-time output power function of the green electricity system, unit: kW, is time, unit: h; The average output of the green electricity system within a day is: ; The mass flow of water is: ; In S2, the green electricity output fluctuation coefficient within a day is: ; ; In the formula, is the standard deviation of the daily output.

[0012] Further, in S3, the heat exchange capacity of the preheating section solid electric heat storage boiler, the superheating section solid electric heat storage boiler and the evaporation section is: When , the green electricity output curve is selected , and , wherein , the heat exchange capacity of the preheating section solid electric heat storage boiler is: ; The green electricity output curve is selected , obtaining and , wherein , the heat exchange capacity of the superheating section solid electric heat storage boiler is: ; The heat exchange capacity of the evaporation section is: ; Since the electrode boiler of the evaporation section needs to participate in 0-100% power regulation, the rated power of the electrode boiler is: ; When , the rated power of the electrode boiler is , according to the power ratio of the solid heat storage preheating section, the solid heat storage evaporation section and the solid heat storage superheating section being 3:3:1.

[0013] Further, in S4, the mass of the heat storage body of the solid heat storage preheating section and the solid heat storage superheating section is specifically: ; ; In the formula, is the mass of the heat storage body required by the preheating section solid electric heat storage boiler, in kg, is the mass of the heat storage body required by the superheating section solid electric heat storage boiler, in kg, is the specific heat capacity of the heat storage body, in , is the temperature change range of the heat storage body, in , is the heat exchange capacity of the preheating section solid electric heat storage boiler, is the heat exchange capacity of the superheating section solid electric heat storage boiler; The rated volume of the heat preservation water tank and the steam accumulator according to the average power of the electrode boiler is specifically: In the non-heat storage stage of For: ; Average power of electrode boiler in full phase evaporation section For: ; Take , ; Let the water taking coefficient For: ; The storage volume of the heat preservation water tank is: ; The steam accumulator stores the water generated by the electrode boiler in the evaporation section but not consumed by the superheating section, and due to the overall water balance, the volume of the steam accumulator is equal to the volume of the heat preservation water tank.

[0014] A working method of a green electricity full consumption and storage type solid electric heat storage boiler-electrode boiler composite system, based on any of the composite systems, the process includes: Real-time detection of the output power of the green electricity system, real-time adjustment of the working mode of the current system according to the output power of the green electricity system, preheating of water by the solid heat storage preheating section to reach the required preheating temperature, and entering the heat preservation water tank; the evaporation section evaporates the water in the heat preservation water tank to form steam, adjusts the third flow controller to output steam according to the preset processing capacity of the solid heat storage superheating section, temporarily stores the excess steam in the steam accumulator, and the solid heat storage superheating section reheats the steam to form superheated steam, which is finally output to the steam injection pipeline.

[0015] Further, the working mode includes: evaporation section working mode, solid heat storage preheating section heat storage and heat release mode, solid heat storage preheating section and solid heat storage superheating section heat storage and heat release mode; The evaporation section working mode is specifically: when the output power of the green electricity system is not greater than the power demand of the solid heat storage preheating section, the solid heat storage preheating section and the solid heat storage superheating section in the system are in heat release mode, and the evaporation section remains working; The solid heat storage preheating section heat storage and heat release mode is specifically: when the output power of the green electricity system is greater than the power demand of the solid heat storage preheating section but not greater than the total power demand of the solid heat storage preheating section and the solid heat storage superheating section, the solid heat storage preheating section in the system is in heat storage and heat release mode, the solid heat storage superheating section is in heat release mode, and the evaporation section remains working; The specific solid heat storage preheating section and solid heat storage superheating section are both in the mode of heat storage and heat release, that is, when the output power of the green electricity system is greater than the total power demand of the solid heat storage preheating section and the solid heat storage superheating section, the solid heat storage preheating section and the solid heat storage superheating section in the system are both in the mode of heat storage and heat release, and the evaporation section keeps working. The system and method provided by the application can realize full consumption of green electricity, provide continuous and stable steam, solve the problem of blockage of the solid heat storage boiler and the gas injection pipeline in the superheating section caused by water scale, improve efficiency, avoid safety accidents, and solve the capacity configuration problem in the scenario of simultaneous use of the solid heat storage boiler and the electrode boiler in the preheating section and the superheating section. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The application provides a green electricity full consumption type solid electric heat storage boiler-electrode boiler composite system. Figure 2 The application provides a typical daily green electricity output curve. In the figure, 1 is a solid heat storage preheating section, 101 is a preheating section solid electric heat storage boiler, 102 is a preheating heat exchanger, 103 is a first fan, 2 is a solid heat storage superheating section, 201 is a superheating section solid electric heat storage boiler, 202 is a superheating heat exchanger, 203 is a second fan, 3 is an electrode boiler, 4 is a heat preservation water tank, 5 is a steam heat accumulator, 6 is a fan group cooling system, 601 is a radiator, 602 is a liquid cooling pipeline, 603 is a circulating pump, 7 is a first flow controller, 8 is a second flow controller, 9 is a third flow controller, 10 is a fourth flow controller, 11 is a first flow meter, 12 is a second flow meter, 13 is a third flow meter, 14 is a fourth flow meter, and 15 is a three-way control valve. DETAILED DESCRIPTION

[0017] The technical scheme of the application will be described in detail below with reference to the drawings and specific embodiments. It should be understood that the embodiments and specific features in the embodiments are detailed descriptions of the technical scheme of the application, rather than limitations of the technical scheme of the application. In the case of no conflict, the technical features in the embodiments and the embodiments can be combined with each other.

[0018] Embodiment 1 As Figure 1 The application provides a green electricity full consumption type solid electric heat storage boiler-electrode boiler composite system, which comprises a solid heat storage preheating section 1, an evaporation section, a solid heat storage superheating section 2, a heat preservation water tank 4, a steam heat accumulator 5, a fan group cooling system 6, four flow controllers, four flow meters, and a three-way control valve 15. The inlet of the solid heat storage preheating section 1 is connected with an external water supply pipe, the outlet of the solid heat storage preheating section 1 is connected with the inlet of the heat preservation water tank 4, the outlet of the heat preservation water tank 4 is connected with the inlet of the electrode boiler 3, the evaporation section is the electrode boiler 3, the outlet of the electrode boiler 3 is communicated with the three-way control valve 15, two outlets of the three-way control valve 15 are respectively connected with the steam heat accumulator 5 and the inlet of the solid heat storage superheating section 2, the outlet of the steam heat accumulator 5 is connected with the outlet of the electrode boiler 3, for storing the excess steam generated by the electrode boiler 3, the outlet of the solid heat storage superheating section 2 outputs superheated steam and is injected into a gas injection pipeline; the fan group cooling system 6 is used for cooling and dissipating heat of the fans in the solid heat storage preheating section 1 and the solid heat storage superheating section 2. The four flow controllers include: a first flow controller 7, a second flow controller 8, a third flow controller 9 and a fourth flow controller 10, the first flow controller 7 is arranged at the inlet of the solid heat storage preheating section 1, for controlling the water flow entering the solid heat storage preheating section 1; the second flow controller 8 is arranged on the pipeline communicated between the heat preservation water tank 4 and the electrode boiler 3, for controlling the water flow entering the electrode boiler 3; the third flow controller 9 is arranged on the pipeline communicated between the electrode boiler 3 and the three-way control valve 15, for controlling the steam flow delivered by the electrode boiler 3 to the solid heat storage superheating section 2; the fourth flow controller 10 is arranged on the pipeline communicated between the steam heat accumulator 5 and the three-way control valve 15, for controlling the steam flow delivered by the steam heat accumulator 5 to the superheating heat exchanger 202. The four flow controllers include: a first flow controller 7, a second flow controller 8, a third flow controller 9 and a fourth flow controller 10, the first flow controller 7 is arranged at the inlet of the solid heat storage preheating section 1, for controlling the water flow entering the solid heat storage preheating section 1; the second flow controller 8 is arranged on the pipeline communicated between the heat preservation water tank 4 and the electrode boiler 3, for controlling the water flow entering the electrode boiler 3; the third flow controller 9 is arranged on the pipeline communicated between the electrode boiler 3 and the three-way control valve 15, for controlling the steam flow delivered by the electrode boiler 3 to the solid heat storage superheating section 2; the fourth flow controller 10 is arranged on the pipeline communicated between the steam heat accumulator 5 and the three-way control valve 15, for controlling the steam flow delivered by the steam heat accumulator 5 to the superheating heat exchanger 202.

[0019] The solid heat storage preheating section 1 comprises a preheating heat exchanger 102, a first fan 103 and a preheating section solid electric heat storage boiler 101, the preheating section solid electric heat storage boiler 101 is connected with the air side inlet and outlet of the preheating heat exchanger 102 through two high-temperature air conveying pipelines, the first fan 103 is connected in series on one of the high-temperature air conveying pipelines, and is used for blowing the heated air of the preheating section solid electric heat storage boiler 101 into the preheating heat exchanger 102, the medium side inlet of the preheating heat exchanger 102 is connected with an external water pipe, and the medium side outlet of the preheating heat exchanger 102 is connected with a heat preservation water tank 4, and the principle of heating of the solid heat storage preheating section 1 is explained, when the green electricity output meets the power of the solid electric heat storage boiler, the electric energy is converted into heat energy and stored in the heat storage body in the solid heat storage furnace through resistance heating, high-temperature air is formed after heat exchange between air and the heat storage body, the high-temperature air is circulated through the fan, and the liquid is heat-exchanged in the preheating heat exchanger 102 to heat the liquid; The solid heat storage superheating section 2 comprises a superheating heat exchanger 202, a second fan 203 and a superheating section solid electric heat storage boiler 201, the superheating section solid electric heat storage boiler 201 is connected with the air side inlet and air side outlet of the superheating heat exchanger 202 through two high-temperature air conveying pipelines, the second fan 203 is connected in series on one of the high-temperature air conveying pipelines, and is used for blowing the high-temperature air of the superheating section solid electric heat storage boiler 201 into the superheating heat exchanger 202, the medium side inlet of the superheating heat exchanger 202 is connected with a three-way control valve 15, and the medium side outlet of the superheating heat exchanger 202 is connected with an external steam pipe network.

[0020] The fan group cooling system 6 comprises a radiator 601, a liquid cooling pipeline 602 and a circulating pump 603, the liquid cooling pipeline 602 constitutes a ring-shaped pipeline, and the first fan 103, the second fan 203, the radiator 601 and the circulating pump 603 are connected in series, and are used for cooling and cooling the first fan 103 and the second fan 203; The electrode boiler 3 adopts the prior art (201922412343x) to remove scale of the electrode boiler 3.

[0021] Embodiment 2: Based on the system of embodiment 1, a system establishment method is provided, and specifically: As Figure 2 , by collecting the daily green electricity power of a certain area, the typical daily green electricity output curve of the area is obtained , so that the daily power generation is quickly calculated .

[0022] According to the daily power generation , the average power of the green electricity system is calculated .

[0023] According to the steam parameters required by the region, the initial state of water is ( , ), the specific enthalpy ; the final state of water is ( , , superheated 9 degrees), the specific enthalpy , the system thermal efficiency is taken as , the mass flow of water is calculated .

[0024] ; According to the green electricity output curve , the green electricity output fluctuation coefficient is calculated , , applicable to the system given in Example 1: ; ; When , the power ratio of the preheating section, the evaporation section and the superheating section is set to 3:2:1, according to the following formula, the is 12:15, is 18:15: ; According to the following formula, the is 12:45, is 17:30: According to the calculation, the power of the electrode boiler 3 is: ; Thus, the preheating section and the superheating section heat exchange capacity : ; ; ； The mass of the regenerator required for the preheating section and the superheating section is calculated, magnesium bricks ( ) are selected as the regenerator material, and the temperature variation range of the magnesium bricks is selected as 500-800 , At this point, we can obtain and : ; ; Calculate the volumes of the insulated water tank 4 and the steam accumulator 5, in order to As for the density of water, During the non-heat storage stage, the average power of the evaporation section is, ; Average power of electrode boiler in the entire evaporation section for: ; Pick , ; ; Therefore, the water storage capacity of insulated water tank 4 is: ; Steam accumulator 5 stores water generated in the evaporation section but not consumed by the superheating section. Due to overall water balance, The volume of tank 5 is equal to the volume of insulated water tank 4. .

[0025] Example 3: Based on the system in Example 1, the working method of the system is given. The output power of the green power system is detected in real time. According to the output power of the green power system, the working mode of the current system is adjusted in real time. External water (softened water, recycled water) is preheated in the solid heat storage preheating section 1 to reach the required preheating temperature and enters the insulated water tank 4. The evaporation section evaporates the water in the insulated water tank 4 to form steam. The third flow controller 9 is adjusted to output steam according to the preset processing capacity of the solid heat storage superheating section 2. Excess steam is temporarily stored in the steam accumulator 5. The solid heat storage superheating section 2 reheats the steam to form superheated steam and finally outputs it to the steam injection pipeline.

[0026] The operating modes include: evaporation section operating mode, solid heat storage preheating section heat storage and heat release mode, and solid heat storage preheating section and solid heat storage superheating section heat storage and heat release mode. The specific operating mode of the evaporation section is as follows: when the output power of the green electricity system is not greater than the power requirement of the solid thermal storage preheating section 1, such as... Figure 2 During 0-t1 and t2-24, the solid heat storage preheating section 1 and solid heat storage superheating section 2 in the system are in heat release mode, while the evaporation section remains operational. The solid heat storage preheating section edge heat storage and heat release mode is specifically as follows: when the output power of the green electricity system is greater than the power demand of the solid heat storage preheating section 1 but is not greater than the total power demand of the solid heat storage preheating section 1 and the solid heat storage overheating section, such as Figure 2 In the time period t1-t3 and t2-t4, the solid heat storage preheating section 1 in the system is in the edge heat storage and heat release mode, the solid heat storage overheating section 2 is in the heat release mode, and the evaporation section keeps working. The solid heat storage preheating section and the solid heat storage overheating section are both in the edge heat storage and heat release mode, and the evaporation section keeps working. Figure 2 In the time period t3-t4, the solid heat storage preheating section 1 and the solid heat storage overheating section 2 in the system are both in the edge heat storage and heat release mode, and the evaporation section keeps working.

[0027] Specifically, At the moment, the evaporation section is in the working mode, the solid heat storage furnace preheating section and the overheating section are in the heat release mode only, the power of the electrode boiler 3 is adjusted according to the power of the green electricity, so that the green electricity is used for the electrode furnace entirely. At this time, the power of the electrode boiler 3 is small, the steam amount generated by the electrode boiler 3 is less than the rated steam amount of the overheating section, the steam is less, the water consumption is also less, and is less than the water flow rate through the preheating heat exchanger 102. The second flow controller is controlled according to the power of the electrode furnace to control the water amount entering the electrode boiler 3. The three-way control valve 15 is controlled so that the left and right channels thereof are closed, and the steam of the electrode boiler 3 is led to the steam heat accumulator 5. At this time, the steam generated by the electrode boiler 3 is entirely led into the steam heat accumulator 5, and is led into the overheating heat exchanger 202 through the fourth flow controller 10 and the three-way control valve 15. At this time, in the heat preservation water tank 4, the water amount generated by the preheating section is greater than the water consumption of the electrode boiler 3, and the overall water amount of the heat preservation water tank 4 increases; in the steam heat accumulator 5, the steam amount generated by the electrode boiler 3 is less than the steam consumption amount of the overheating section, and the overall steam amount of the steam heat accumulator 5 decreases.

[0028] At time t2, the solid heat storage preheating section and the solid heat storage superheating section are in the mode of heat storage and heat release at the same time. According to the output power of green electricity, the electric power of the solid heat storage boiler preheating section and the superheating section, the power of the electrode boiler 3 is controlled and adjusted to realize full consumption of green electricity. At this time, the steam quantity generated by the electrode boiler 3 is greater than the rated steam quantity of the superheating section, and the water consumption is relatively large. The second flow controller is controlled according to the power of the electrode boiler 3 to control the water quantity entering the electrode boiler 3. The third flow controller 9 is controlled, so that the steam quantity of the electrode boiler 3 entering the superheating heat exchanger 202 is a preset value. The three-way control valve 15 is controlled to be connected to the left and right channels, and the channel to the steam storage device 5 is closed. The excess steam generated by the electrode furnace directly enters the steam storage device 5 through the connecting pipeline between the electrode boiler 3 and the steam storage device 5 for storage. At this time, in the heat preservation water tank 4, the water quantity generated by the preheating section is less than the water quantity consumed by the electrode boiler 3, and the overall water quantity of the heat preservation water tank 4 decreases. In the steam storage device 5, the steam quantity generated by the electrode boiler 3 is greater than the steam consumption quantity of the superheating section, and the overall steam quantity of the steam storage device 5 increases.

[0029] At time t2, the solid heat storage preheating section and the solid heat storage superheating section are in the mode of heat storage and heat release at the same time. According to the output power of green electricity, the electric power of the solid heat storage boiler preheating section and the superheating section, the power of the electrode boiler 3 is controlled and adjusted to realize full consumption of green electricity. At this time, the steam quantity generated by the electrode boiler 3 is greater than the rated steam quantity of the superheating section, and the water consumption is relatively large. The second flow controller is controlled according to the power of the electrode boiler 3 to control the water quantity entering the electrode boiler 3. The third flow controller 9 is controlled, so that the steam quantity of the electrode boiler 3 entering the superheating heat exchanger 202 is a preset value. The three-way control valve 15 is controlled to be connected to the left and right channels, and the channel to the steam storage device 5 is closed. The excess steam generated by the electrode furnace directly enters the steam storage device 5 through the connecting pipeline between the electrode boiler 3 and the steam storage device 5 for storage. At this time, in the heat preservation water tank 4, the water quantity generated by the preheating section is less than the water quantity consumed by the electrode boiler 3, and the overall water quantity of the heat preservation water tank 4 decreases. In the steam storage device 5, the steam quantity generated by the electrode boiler 3 is greater than the steam consumption quantity of the superheating section, and the overall steam quantity of the steam storage device 5 increases.

[0030] At this moment, the working mode of the evaporating section is the working mode of the electrode furnace, the preheating section and the superheating section of the solid heat accumulator are in the heat releasing mode only, the control device adjusts the power of the electrode furnace according to the power of the green electricity, so that the green electricity is used in the electrode furnace completely. At this moment, the steam quantity generated by the electrode boiler 3 is greater than the rated steam quantity of the superheating section, and the water consumption is relatively large. The second flow controller is controlled according to the power of the electrode boiler 3, so that the water quantity entering the electrode boiler 3 is controlled. The third flow controller 9 is controlled, so that the steam quantity of the electrode boiler 3 entering the superheating heat exchanger 202 is the preset value. The three-way control valve 15 is controlled, so that the left and right channels are connected, and the channel leading to the steam accumulator 5 is closed. The excess steam generated by the electrode furnace will directly enter the steam accumulator 5 through the connecting pipeline between the electrode boiler 3 and the steam accumulator 5 for storage. At this moment, in the heat preservation water tank 4, the water quantity generated by the preheating section is less than the water quantity consumed by the electrode boiler 3, and the overall water quantity of the heat preservation water tank 4 is reduced. In the steam accumulator 5, the steam quantity generated by the electrode boiler 3 is greater than the steam consumption quantity of the superheating section, and the overall steam quantity of the steam accumulator 5 is increased.

[0031] The embodiments of the present application are described above with reference to the drawings; however, the present application is not limited to the specific embodiments described above, and the specific embodiments described above are merely illustrative rather than restrictive. Those skilled in the art can make many modifications to the present application without departing from the spirit and scope of the present application and the scope of protection of the claims, and all these modifications are within the scope of protection of the present application.

Claims

1. A green electricity full-absorption type solid-state electric thermal storage boiler-electrode boiler composite system, characterized in that, include: Solid heat storage preheating section, evaporation section, solid heat storage superheating section, insulated water tank, steam accumulator, fan unit cooling system, several flow controllers, several flow meters and three-way control valves; The inlet of the solid thermal storage preheating section is connected to an external water supply pipe, and the outlet of the solid thermal storage preheating section is connected to the inlet of an insulated water tank. The outlet of the insulated water tank is connected to the inlet of an electrode boiler. The evaporation section is an electrode boiler, and the outlet of the electrode boiler is connected to a three-way control valve. The two outlets of the three-way control valve are respectively connected to the inlets of a steam accumulator and a solid thermal storage superheating section. The outlet of the steam accumulator is connected to the outlet of the electrode boiler and is used to store excess steam generated by the electrode boiler. The outlet of the solid thermal storage superheating section outputs superheated steam and injects it into the gas injection pipeline. The fan unit cooling system is used to cool and dissipate heat from the fans in the solid thermal storage preheating section and the solid thermal storage superheating section. The flow meters and flow controllers are used to monitor and control the water flow and steam flow in the system.

2. The green electricity full-absorption type solid-state electric thermal storage boiler-electrode boiler composite system according to claim 1, characterized in that, The plurality of flow controllers includes: a first flow controller, a second flow controller, a third flow controller, and a fourth flow controller. The first flow controller is installed at the inlet of the solid thermal storage preheating section and is used to control the water flow rate entering the solid thermal storage preheating section. The second flow controller is installed on the pipeline connecting the insulated water tank and the electrode boiler and is used to control the water flow rate entering the electrode boiler. The third flow controller is installed on the pipeline connecting the electrode boiler and the three-way control valve and is used to control the steam flow rate delivered by the electrode boiler to the solid thermal storage superheating section. The fourth flow controller is installed on the pipeline connecting the steam accumulator and the three-way control valve and is used to control the steam flow rate delivered by the steam accumulator to the superheated heat exchanger. The plurality of flow meters includes: a first flow meter, a second flow meter, a third flow meter, and a fourth flow meter. The first flow meter is installed at the inlet of the solid thermal storage preheating section and is used to record the water flow rate entering the solid thermal storage preheating section. The second flow meter is installed on the pipeline connecting the insulated water tank and the electrode boiler and is used to record the water flow rate entering the electrode boiler. The third flow meter is installed on the pipeline connecting the steam accumulator and the electrode boiler and is used to record the steam flow rate from the steam accumulator to the electrode boiler. The fourth flow meter is installed on the pipeline connecting the three-way control valve and the solid thermal storage superheating section.

3. The green electricity fully-absorbed solid-state electric thermal storage boiler-electrode boiler composite system according to claim 1, characterized in that, The solid thermal storage preheating section includes: a preheating heat exchanger, a first fan, and a preheating section solid electric thermal storage boiler. The preheating section solid electric thermal storage boiler is connected to the air-side inlet and outlet of the preheating heat exchanger via two high-temperature air delivery pipelines. The first fan is connected in series on one of the high-temperature air delivery pipelines to blow the heated air from the preheating section solid electric thermal storage boiler into the preheating heat exchanger. The medium-side inlet of the preheating heat exchanger is connected to an external water pipe, and the medium-side outlet of the preheating heat exchanger is connected to an insulated water tank. The solid-state thermal storage superheating section includes a superheater heat exchanger, a second fan, and a superheater section solid-state electric thermal storage boiler. The superheater section solid-state electric thermal storage boiler is connected to the air-side inlet and air-side outlet of the superheater heat exchanger via two high-temperature air delivery pipelines. The second fan is connected in series on one of the high-temperature air delivery pipelines to blow high-temperature air from the superheater section solid-state electric thermal storage boiler into the superheater heat exchanger. The medium-side inlet of the superheater heat exchanger is connected to a three-way control valve, and the medium-side outlet of the superheater heat exchanger is connected to an external steam network.

4. The green electricity full-absorption type solid-state electric thermal storage boiler-electrode boiler composite system according to claim 3, characterized in that, The fan unit cooling system includes a radiator, liquid cooling pipelines and a circulating pump. The liquid cooling pipelines are connected in series with a first fan, a second fan, a radiator and a circulating pump, for cooling the first fan and the second fan.

5. A method for establishing a green electricity-fully-absorbable solid-state electric thermal storage boiler-electrode boiler composite system, characterized in that, Based on the composite system as described in any one of claims 1-4, the steps include: S1. Collect the green electricity power supplied to the boiler system for a typical day from 0 to 24 hours at a uniform time interval, and fit the green electricity output curve. The daily green electricity generation in the oilfield was obtained. Based on the daily green electricity generation in the oilfield The average daily output of the green power system was obtained. Combined with the initial specific enthalpy of the steam required by the oil field Final enthalpy and thermal efficiency of composite systems Obtain the required water mass flow rate ; S2. Based on the green electricity output curve The daily green power output fluctuation coefficient was obtained. ,when Sometimes, or Furthermore, this composite system is adopted when the proportion of photovoltaic power output in the green electricity composition is greater than 50%. S3, if Then the power ratio of the solid thermal storage preheating section, electrode boiler, and solid thermal storage superheating section is set to 3:2:

1. Furthermore, when photovoltaic power output accounts for more than 50% of the green electricity composition, the power ratio of the solid-state thermal storage preheating section, evaporation section, and solid-state thermal storage superheating section is set to 3:3:1; based on the maximum green electricity output. Based on the power ratio, the heat exchange rates of the preheating section solid-state electric thermal storage boiler, the superheating section solid-state electric thermal storage boiler, and the evaporation section electrode boiler were obtained, and the results were determined. At that time, the rated power of the evaporation section is ,like Furthermore, when photovoltaic power output accounts for more than 50% of the green electricity composition, the rated power of the evaporation section is... ; S4. Based on the heat exchange capacity of the electrode boiler in the preheating section, superheating section, and evaporation section, the specific heat capacity of the heat storage material, and the temperature change range of the heat storage material, the mass of the heat storage body in the solid heat storage preheating section and the solid heat storage superheating section are obtained respectively. The rated volumes of the insulated water tank and steam accumulator are obtained based on the average power of the electrode boiler, and the composite system is finally constructed.

6. The method for establishing a green electricity full-absorption type solid-state electric thermal storage boiler-electrode boiler composite system according to claim 5, characterized in that, In S1, the daily power generation of green electricity in the oil field for: ； In the formula, This is the real-time output power function of the green electricity system, in kW. Time, in hours (h); The average daily output of the green power system for: ； The mass flow rate of the water for: ； In S2, the intraday green power output fluctuation coefficient for: ； ； In the formula, The standard deviation of daily output.

7. The method for establishing a green electricity full-absorption type solid-state electric thermal storage boiler-electrode boiler composite system according to claim 5, characterized in that, In S3, the heat exchange capacity of the preheating section solid-state electric thermal storage boiler, the superheating section solid-state electric thermal storage boiler, and the evaporation section is: when When selecting a green electricity output curve , and ,in The heat exchange capacity of the preheating section solid-state electric thermal storage boiler is: ； Select green electricity output curve ,get and ,in The heat exchange capacity of the superheated section solid-state electric thermal storage boiler is: ； The heat exchange in the evaporation section is: ； Since the electrode boiler in the evaporation section needs to participate in 0-100% power regulation, the rated power of the electrode boiler is: ； when Similarly, based on the power ratio of the solid thermal storage preheating section, evaporation section, and solid thermal storage superheating section being set at 3:3:1, the rated power of the electrode boiler can be obtained as follows: .

8. The method for establishing a green electricity full-absorption type solid-state electric thermal storage boiler-electrode boiler composite system according to claim 7, characterized in that, In S4, the specific mass of the heat storage body obtained in the solid heat storage preheating section and the solid heat storage superheating section is as follows: ； ； In the formula, This refers to the required mass of thermal storage material for the preheating section of the solid-state electric thermal storage boiler, expressed in kg. This refers to the required mass of thermal storage material for a solid-state electric thermal storage boiler in the superheated section, expressed in kg. Specific heat capacity of the heat storage body, per unit , The temperature range of the heat storage body, in units , For the heat exchange of the solid-state electric thermal storage boiler in the preheating section, For the heat exchange of the superheated section of the solid-state electric thermal storage boiler; The specific details of obtaining the rated volume of the insulated water tank and steam accumulator based on the average power of the electrode boiler are as follows: In the non-heat storage stage, the average power of the electrode boiler in the evaporation section for: ； Average power of electrode boiler in the entire evaporation section for: ； Pick , ; Let the water extraction coefficient for: ； The water storage capacity of the insulated water tank is: ； The steam accumulator stores water generated by the electrode boiler in the evaporation section but not consumed by the superheating section. Due to the overall water balance, the volume of the steam accumulator is equal to the volume of the insulated water tank.

9. A working method for a green electricity fully-absorbed solid-state electric thermal storage boiler-electrode boiler composite system, characterized in that, Based on the composite system described in any one of claims 1-4, the process includes: The output power of the green power system is monitored in real time, and the current system working mode is adjusted in real time according to the output power of the green power system. External water is preheated in the solid heat storage preheating section to reach the required preheating temperature and enters the insulated water tank. The evaporation section evaporates the water in the insulated water tank to form steam. The third flow controller adjusts the output of steam according to the preset processing capacity of the solid heat storage superheating section. Excess steam is temporarily stored in the steam accumulator. The solid heat storage superheating section reheats the steam to form superheated steam, which is finally output to the steam injection pipeline.

10. The working method of a green electricity full-absorption type solid-state electric thermal storage boiler-electrode boiler composite system according to claim 9, characterized in that, The operating modes include: evaporation section operating mode, solid heat storage preheating section heat storage and heat release mode, and solid heat storage preheating section and solid heat storage superheating section heat storage and heat release mode. The specific operating mode of the evaporation section is as follows: when the output power of the green electricity system is not greater than the power requirement of the solid thermal storage preheating section, the solid thermal storage preheating section and the solid thermal storage superheating section in the system are in heat release mode, while the evaporation section remains operational. The solid thermal storage preheating section's simultaneous heat storage and heat release mode is as follows: when the output power of the green power system is greater than the power demand of the solid thermal storage preheating section but not greater than the total power demand of the solid thermal storage preheating section and the solid thermal storage superheating section, the solid thermal storage preheating section in the system is in simultaneous heat storage and heat release mode, the solid thermal storage superheating section is in heat release mode, and the evaporation section remains operational. The solid thermal storage preheating section and the solid thermal storage superheating section are both in a simultaneous heat storage and heat release mode. Specifically, when the output power of the green power system is greater than the total power demand of the solid thermal storage preheating section and the solid thermal storage superheating section, both the solid thermal storage preheating section and the solid thermal storage superheating section in the system are in a simultaneous heat storage and heat release mode, while the evaporation section continues to operate.

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