A thermal oil filter draining device system for a trough type solar thermal power station

Abstract

The present invention belongs to the technical field of trough solar thermal power generation, and in particular, relates to a thermal oil filter emptying device system for a trough solar thermal power station. The present invention includes a thermal oil filter I, a thermal oil pump II, a power generation module III and an expansion tank IV, and also includes a discharge tank, which is connected to the thermal oil filter I through a pipeline. The newly added thermal oil filter emptying device system equipment of the present invention adopts a low-position arrangement. After the thermal oil filter emptying device and the filter pressure are balanced, the high-temperature thermal oil in the thermal oil filter I is accelerated to be discharged into the emptying device by gravity and an exhaust fan, thereby facilitating the rapid removal and maintenance of the thermal oil pump inlet filter, saving the filter replacement time during the unit commissioning, and also saving the filter and thermal oil main pump maintenance time during the normal operation of the unit, thereby shortening the unit shutdown maintenance time and improving the thermal economy of the unit.

Description

Technical Field

[0001] The present invention belongs to the technical field of trough type solar thermal power generation, and in particular relates to a heat transfer oil filter emptying device system for a trough type solar thermal power station. Background Art

[0002] During the initial startup and operation of the thermal oil system of the trough solar thermal power station, impurities in the system will accumulate on the inlet filter of the thermal oil pump during the circulation process. Since the thermal oil solidifies at a temperature below 12°C and is slightly toxic, and the temperature of the thermal oil is in the range of 50°C-398°C during normal operation, when the thermal oil inlet filter is blocked, it is necessary to wait until the thermal oil temperature drops to a lower temperature and discharge the thermal oil in the filter before cleaning the filter. The filter cleaning and maintenance time is relatively long. This prolongs the commissioning time of the unit oil circulation process, and at the same time, during normal operation, prolongs the maintenance time of the main equipment of the unit.

[0003] Therefore, how to safely and effectively discharge the thermal oil in the inlet filter of the thermal oil pump is a technical problem that urgently needs to be solved. Summary of the invention

[0004] In view of the shortcomings of the above-mentioned prior art, the present invention provides a thermal oil filter emptying device system for a trough-type solar thermal power station. Its purpose is to achieve rapid discharge of thermal oil before cleaning the filter at the inlet of the thermal oil pump, and at the same time, maintain a slight negative pressure in the filter before opening the filter by switching the exhaust fan exhaust pipeline, thereby achieving the dual functions of rapid oil discharge and slight negative pressure to open the filter, solving the danger of thermal oil gas discharge to the staff due to positive pressure in the inlet filter of the high-temperature thermal oil pump, and also greatly shortening the replacement time of the inlet filter of the high-temperature thermal oil pump, and shortening the maintenance time of the thermal oil pump.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0006] A thermal oil filter emptying device system for a trough type solar thermal power station comprises a thermal oil filter I, a thermal oil pump II, a power generation module III and an expansion tank IV, wherein the thermal oil expansion tank IV is connected to the thermal oil filter I through a pipeline provided with a manual butterfly valve A, and the other end of the thermal oil filter I is connected to the thermal oil pump II through a pipeline provided with a manual butterfly valve B; the other end of the thermal oil pump II is connected to the power generation module III through a pipeline provided with a check valve C and a pneumatic regulating butterfly valve A; the other end of the power generation module III is connected to the expansion tank IV through a pipeline provided with a pneumatic regulating butterfly valve B; and also includes a discharge tank, which is connected to the thermal oil filter I through a pipeline.

[0007] Furthermore, the discharge tank is connected to the thermal oil filter I through a pipeline provided with a fifth manual stop valve and a fourth manual stop valve.

[0008] Furthermore, the discharge tank is connected to the thermal oil filter 1 in sequence through a pipeline which is provided with a twelfth manual stop valve, an exhaust fan, a third manual stop valve and a first manual stop valve 1 in sequence.

[0009] Furthermore, the discharge tank is connected to the activated carbon filter through a pipeline which is provided with a twelfth manual stop valve, an exhaust fan, a check valve A, and a second manual stop valve in sequence.

[0010] Furthermore, the discharge tank is connected to the thermal oil filter I through a pipeline provided with a fifteenth manual stop valve.

[0011] Furthermore, the discharge tank is connected to the thermal oil filter I through a pipeline which is sequentially provided with a ninth manual stop valve, a thermal oil return pump, a check valve B, a pneumatic regulating valve and an eleventh manual stop valve.

[0012] Furthermore, the discharge tank is connected to the pressure instrument through a pipeline provided with a sixth manual stop valve; the discharge tank is also connected to the liquid level instrument through a pipeline provided with a seventh manual stop valve; the discharge tank is also connected to the nitrogen filling interface through a pipeline provided with an eighth manual stop valve.

[0013] Furthermore, a heater installation insertion hole is provided on one side of the discharge tank body, and the electric heating device is inserted into the heater installation insertion hole and connected via a flange.

[0014] Furthermore, the method for a thermal oil filter emptying device system for a trough type solar thermal power station comprises the following steps:

[0015] Step 1. Quick oil drainage step of the filter;

[0016] Step 2. The step of opening the thermal oil filter with slight negative pressure after the oil is drained;

[0017] Step 3. Nitrogen replacement step after cleaning the thermal oil filter;

[0018] Step 4. Heat transfer oil injection step after nitrogen replacement is completed.

[0019] Furthermore, the filter screen rapid oil drainage step in step 1 includes:

[0020] Open the first manual stop valve, the third manual stop valve, the fourth manual stop valve, and the fifth manual stop valve to balance the pressure of the thermal oil pump II and the discharge tank, and the thermal oil in the thermal oil filter I begins to flow into the discharge tank by gravity; start the exhaust fan, and draw the gas in the discharge tank into the upper part of the thermal oil filter I at the inlet of the thermal oil pump II. The discharge tank is negatively pressurized, and the upper part of the thermal oil filter I is positively pressurized, thereby accelerating the discharge of the thermal oil in the thermal oil filter I into the discharge tank; when the thermal oil level in the discharge tank remains unchanged, the thermal oil in the thermal oil filter I is completely discharged;

[0021] The step of opening the heat transfer oil filter under slight negative pressure after the oil is drained in step 2 comprises:

[0022] After the heat transfer oil in the heat transfer oil filter I is emptied, adjust the second manual stop valve and close the third manual stop valve at the same time to maintain a slight negative pressure in the discharge tank, and open the heat transfer oil filter I at the inlet of the heat transfer oil pump II;

[0023] The nitrogen replacement step after the heat transfer oil filter screen I is cleaned in step 3 includes:

[0024] After the thermal oil filter screen I is cleaned, the filter screen is installed, and the inspection flange is closed; the exhaust fan is turned off, and the eighth manual stop valve of the nitrogen injection interface is opened, the first manual stop valve, the second manual stop valve, the third manual stop valve, the fourth manual stop valve, the fifth manual stop valve, and the eighth manual stop valve are opened, and the twelfth manual stop valve is closed to replace the thermal oil filter screen I with nitrogen, and the nitrogen replacement is completed;

[0025] The step of injecting heat transfer oil after nitrogen replacement is completed in step 4 includes:

[0026] After nitrogen replacement is completed, close the first manual stop valve, the second manual stop valve, the third manual stop valve, the fourth manual stop valve, the fifth manual stop valve and the eighth manual stop valve, open the ninth manual stop valve, the pneumatic regulating valve, the eleventh manual stop valve 11 and the fifteenth manual stop valve, start the heat transfer oil return pump, and discharge the heat transfer oil in the discharge tank into the heat transfer oil filter I at the inlet of the heat transfer oil pump II, start the heat transfer oil return pump, and pump the heat transfer oil discharged from the heat transfer oil filter I into the discharge tank into the heat transfer oil filter I.

[0027] The present invention has the following beneficial effects and advantages:

[0028] The newly added thermal oil filter screen emptying device system equipment of the present invention adopts a low-position arrangement. After the thermal oil filter screen emptying device and the filter screen pressure are balanced, the high-temperature thermal oil in the thermal oil filter screen I is accelerated to be discharged into the emptying device through gravity and the exhaust fan, thereby facilitating the rapid removal and maintenance of the thermal oil pump inlet filter screen. Since the thermal oil pump inlet filter screen discharge device of the present invention is provided with a dual-slave function exhaust fan, the temperature of the thermal oil does not need to be considered during the cleaning or replacement of the thermal oil pump inlet filter screen, which saves the filter screen replacement time during the unit commissioning period, and also saves the filter screen and the thermal oil main pump maintenance time during the normal operation of the unit; thereby shortening the unit shutdown maintenance time and improving the thermal economy of the unit.

[0029] The system of the present invention is flexible in layout, and different sizes of discharge tanks can be selected according to the capacity of the filter screen at the inlet of the main pump of the trough-type solar thermal power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0031] Figure 1 It is a schematic diagram of the structure of the system of the present invention.

[0032] In the figure:

[0033] The first manual stop valve 1, the second manual stop valve 2, the third manual stop valve 3, the fourth manual stop valve 4, the fifth manual stop valve 5, the sixth manual stop valve 6, the seventh manual stop valve 7, the eighth manual stop valve 8, the ninth manual stop valve 9, the pneumatic control valve 10, the eleventh manual stop valve 11, the twelfth manual stop valve 12, the check valve A13, the check valve B14, the fifteenth manual stop valve 15, the manual butterfly valve A16, the manual butterfly valve B17, the check valve C18, the pneumatic control butterfly valve A19, the pneumatic control butterfly valve B20, the discharge tank 21, the electric heating control device 22, the thermal oil return pump 23, the activated carbon filter 24, the exhaust fan 25, the pressure instrument 26, the liquid level instrument 27, the nitrogen charging interface 28, the temperature measuring instrument 29, the thermal oil filter I, the thermal oil pump II, the power generation module III, the expansion tank IV. DETAILED DESCRIPTION

[0034] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0036] Refer to the following Figure 1 The technical solutions of some embodiments of the present invention are described.

[0037] Example 1

[0038] The present invention is a heat transfer oil filter emptying device system for a trough type solar thermal power station, such as Figure 1 As shown, Figure 1 It is a schematic diagram of the structure of the system of the present invention.

[0039] The system of the present invention mainly includes a heat transfer oil discharge tank 21, a discharge tank heat transfer oil return pump 23, an exhaust fan 25, a discharge tank electric heating control device 22, a discharge tank liquid level meter 27, a discharge tank temperature measuring instrument 29, a discharge tank pressure meter 26, an activated carbon filter 24, and pipes and valves connecting the equipment.

[0040] The original system equipment of the present invention includes: a thermal oil filter I, a thermal oil pump II, a power generation module III and an expansion tank IV, and the connection relationship thereof is as follows:

[0041] The heat transfer oil expansion tank IV is connected to the heat transfer oil filter I through a pipeline, a manual butterfly valve A16, and a pipeline.

[0042] The other end of the heat transfer oil filter screen I is connected to the heat transfer oil pump II through a pipeline, a manual butterfly valve B17, and a pipeline.

[0043] The other end of the heat transfer oil pump II is connected to the power generation module III through a pipeline, a check valve C18, a pipeline, a pneumatic regulating butterfly valve A19, and a pipeline.

[0044] The other end of the power generation module III is connected to the expansion tank IV through a pipeline, a pneumatic regulating butterfly valve B20, and a pipeline.

[0045] The present invention also includes a newly added thermal oil filter screen emptying device system equipment, which is arranged at a low position. After the thermal oil filter screen emptying device and the filter screen pressure are balanced, the high-temperature thermal oil in the thermal oil filter screen I is accelerated to be discharged into the emptying device by gravity and an exhaust fan. This facilitates the rapid removal and maintenance of the thermal oil pump inlet filter screen.

[0046] Specifically include: discharge tank 21, electric heating control device 22, heat transfer oil return pump 23, activated carbon filter 24, exhaust fan 25, pressure instrument 26, liquid level instrument 27, nitrogen filling interface 28, temperature measuring instrument 29 and connecting pipes and valves.

[0047] The newly added thermal oil filter emptying device system of the present invention includes:

[0048] 1. Filter oil drainage process equipment;

[0049] 2. Heat transfer oil accelerated oil discharge process equipment;

[0050] 3. Discharge tank micro-negative pressure process equipment;

[0051] 4. The pressure balance pipeline of the heat transfer oil return filter process;

[0052] 5. Heat transfer oil return filter process equipment;

[0053] 6. Discharge tank pressure instrument;

[0054] 7. The discharge tank liquid level instrument;

[0055] 8. The discharge tank temperature instrument;

[0056] 9. The discharge tank temperature control device;

[0057] 10. Discharge tank negative pressure control device.

[0058] Furthermore, the installation and connection methods of the various devices of the thermal oil filter emptying device system are as follows:

[0059] 1. The filter oil drainage process equipment is connected as follows:

[0060] The thermal oil filter screen 1 is connected to the discharge tank 21 in sequence through a pipeline provided at the bottom of the thermal oil filter screen 1, a fourth manual stop valve 4, a pipeline, and a fifth manual stop valve 5. Among them, the sewage discharge pipeline at the bottom of the thermal oil filter screen 1 is connected to the discharge tank 21 through the fourth manual stop valve 4 and the fifth manual stop valve 5. The thermal oil in the thermal oil filter screen 1 at the inlet of the thermal oil pump is discharged into the discharge tank 21 by opening the fourth manual stop valve 4 and the fifth manual stop valve 5. The thermal oil filter screen 1 is an existing commercially available product.

[0061] 2. Heat transfer oil accelerated oil discharge process equipment connection:

[0062] The discharge tank 21 is connected to the thermal oil filter 1 in sequence through the pipeline connected at the top, the twelfth manual stop valve 12, the pipeline, the exhaust fan 25, the pipeline, the third manual stop valve 3, the pipeline, the first manual stop valve 1, and the pipeline. During the oil discharge process of the thermal oil filter 1, the exhaust fan 25 is started to pump the gas in the discharge tank 21 into the upper part of the thermal oil filter 1 for pressurization, thereby accelerating the discharge speed of the thermal oil in the thermal oil filter 1. When the valve is opened and the fan is not running, the pressure balance between the filter and the discharge tank is achieved, and when the fan is running, the pressurized discharge of the thermal oil in the filter is achieved.

[0063] The exhaust fan 25 is a dual-function exhaust fan, including a pressurization function when the filter screen is draining oil and a slight negative pressure adjustment function when the filter screen is opened. The exhaust fan 25 is connected to the pipeline through a flange and bolts, and the exhaust fan 25 is a commercially available product.

[0064] 3. The connection of the discharge tank micro-negative pressure process equipment is as follows:

[0065] The discharge tank 21 is connected in sequence through the top-connected pipeline, the twelfth manual stop valve 12, the pipeline, the exhaust fan 25, the pipeline, the check valve A13, the pipeline, the second manual stop valve 2, the pipeline and the activated carbon filter 24. The activated carbon filter 24 prevents the exhaust fan from discharging the oil-gas mixture and polluting the atmosphere when the exhaust circuit is switched to the atmosphere. The activated carbon filter 24 is connected to the pipeline flange through a flange.

[0066] When the thermal oil filter 1 is opened, the gas in the discharge tank 21 and the thermal oil filter 1 is discharged into the atmosphere through the exhaust fan 25. After the thermal oil in the filter is emptied, the exhaust outlet of the exhaust fan is switched to the atmosphere, and the outlet valve is adjusted to maintain a slight negative pressure in the thermal oil filter 1 to prevent the spraying of high-temperature oil and gas when the thermal oil filter 1 cover is opened, thereby ensuring the safety of the staff.

[0067] 4. The pressure balance pipeline of the heat transfer oil return process is connected as follows:

[0068] The discharge tank 21 is connected to the fifteenth manual stop valve 15, the pipeline and the pressure balance pipeline tee on the thermal oil filter I through the pipeline connected at the top.

[0069] When the heat transfer oil in the discharge tank 21 is pumped into the heat transfer oil filter 1, the pressure in the heat transfer oil filter 1 and the discharge tank 21 is balanced by opening the fifteenth manual stop valve 15.

[0070] 5. The heat transfer oil return process equipment is connected as follows:

[0071] The discharge tank 21 is connected to the thermal oil filter I in sequence through a pipeline connected at the bottom, the ninth manual stop valve 9, a pipeline, a thermal oil return pump 23, a pipeline, a check valve B14, a pipeline, a pneumatic regulating valve 10, a pipeline, an eleventh manual stop valve 11, and a pipeline.

[0072] The heat transfer oil return pump 23 is used to return the heat transfer oil discharged from the filter to the heat transfer oil pump inlet filter after the heat transfer oil filter is discharged and cleaned. The inlet and outlet ends of the heat transfer oil return pump 23 are connected to the return pump inlet and outlet pipes through flanges.

[0073] When the heat transfer oil filter screen 1 is cleaned, the heat transfer oil in the discharge tank 21 is injected into the heat transfer oil filter screen 1 through the return pump.

[0074] 6. The discharge tank pressure instrument is connected as follows:

[0075] The discharge tank 21 is connected in sequence through a pipe connected at the top, a sixth manual stop valve 6, and a pipe and a pressure instrument 26. The discharge tank pressure instrument 26 is used to monitor the discharge and return process of the thermal oil and the pressure in the discharge tank 21 when the thermal oil filter 1 is opened.

[0076] 7. The discharge tank level instrument is connected as follows:

[0077] The discharge tank 21 is connected in sequence through a pipeline connected at the top, a seventh manual stop valve 7, a pipeline and a liquid level meter 27.

[0078] The discharge tank level meter 27 is used to monitor whether the heat transfer oil in the heat transfer oil filter screen 1 is completely drained or full. The level meter 27 is used to monitor the heat transfer oil level of the discharge tank during the discharge process and during the heat transfer oil return to the filter screen.

[0079] When the heat transfer oil in the heat transfer oil filter 1 is completely drained, the liquid level in the discharge tank 21 no longer rises, and when the heat transfer oil in the heat transfer oil filter 1 is full of heat transfer oil, the liquid level in the discharge tank 21 no longer decreases.

[0080] 8. The discharge tank temperature instrument is installed as follows:

[0081] The temperature measuring instrument 29 is directly inserted into the temperature measuring sleeve at the bottom of the discharge tank 21 to measure the temperature. The temperature measuring instrument 29 is used to monitor the temperature of the heat transfer oil during the discharge process and the process of the heat transfer oil returning to the filter screen.

[0082] 9. The discharge tank temperature control device is installed as follows:

[0083] The electric heating device 22 is directly inserted into the discharge tank 21 through a heater installation insertion hole provided on the side of the discharge tank 21, and is connected to the discharge tank heater insertion hole flange through a flange on the heater.

[0084] The start and stop control of the electric heating is performed by measuring the signal of the temperature measuring instrument 29, so as to realize the control of the temperature of the heat transfer oil in the discharge tank 21. This prevents the heat transfer oil in the discharge tank from being too low and causing the heat transfer oil to solidify, thereby realizing automatic temperature control.

[0085] 10. The nitrogen filling device is installed as follows:

[0086] A nitrogen charging interface is reserved at the top of the discharge tank 21 , and the discharge tank 21 is flange-connected to the eighth manual stop valve 8 through a pipeline and a flange; the eighth manual stop valve 8 is connected to the nitrogen charging interface 28 through a flange and a pipeline.

[0087] Example 2

[0088] The present invention further provides an embodiment, which is a method for discharging heat transfer oil using a heat transfer oil filter emptying device system for a trough type solar thermal power station, which specifically includes the following steps:

[0089] Step 1. Quick oil drainage through the filter.

[0090] The first manual stop valve 1, the third manual stop valve 3, the fourth manual stop valve 4, and the fifth manual stop valve 5 are opened to balance the pressure of the thermal oil pump II and the discharge tank 21, and the thermal oil in the thermal oil filter I begins to flow into the discharge tank 21 by gravity; the exhaust fan 25 is started, and the gas in the discharge tank 21 is drawn out and discharged into the upper part of the thermal oil filter I at the inlet of the thermal oil pump II. The discharge tank 21 is negative pressure, and the upper part of the thermal oil filter I is positive pressure, so that the thermal oil in the thermal oil filter I is accelerated to be discharged into the discharge tank 21. When the thermal oil liquid level in the discharge tank 21 remains unchanged, the thermal oil in the thermal oil filter I is completely discharged.

[0091] Step 2: Open the thermal oil filter under slight negative pressure after draining the oil.

[0092] After the heat transfer oil in the heat transfer oil filter I is drained, adjust the second manual stop valve 2 and close the third manual stop valve 3 at the same time so that the pressure in the discharge tank 21 maintains a slight negative pressure. At this time, the heat transfer oil filter I at the inlet of the heat transfer oil pump II can be opened.

[0093] Step 3. Nitrogen replacement step after the thermal oil filter I is cleaned.

[0094] After the heat transfer oil filter screen 1 is cleaned, the filter screen is installed, and the inspection flange is closed. At this time, the exhaust fan 25 is turned off, and the eighth manual stop valve 8 of the nitrogen injection interface is opened, the first manual stop valve 1, the second manual stop valve 2, the third manual stop valve 3, the fourth manual stop valve 4, the fifth manual stop valve 5, the eighth manual stop valve 8 are opened, and the twelfth manual stop valve 12 is closed to replace the heat transfer oil filter screen 1 with nitrogen, and the nitrogen replacement is completed.

[0095] Step 4. Heat transfer oil injection step after nitrogen replacement is completed.

[0096] After nitrogen replacement is completed, close the first manual stop valve 1, the second manual stop valve 2, the third manual stop valve 3, the fourth manual stop valve 4, the fifth manual stop valve 5 and the eighth manual stop valve 8, open the ninth manual stop valve 9, the pneumatic regulating valve 10, the eleventh manual stop valve 11 and the fifteenth manual stop valve 15, start the thermal oil return pump 23, and discharge the thermal oil in the discharge tank 21 into the thermal oil filter I at the inlet of the thermal oil pump II, start the thermal oil return pump 23, and discharge the thermal oil in the discharge tank 21 into the thermal oil filter I through the thermal oil filter I.

[0097] In the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The terms "connected" and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0098] In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0099] In the description of this specification, the description of the terms "one embodiment", "some embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0100] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for a thermal oil filter emptying device system for a trough type solar thermal power station, which is implemented by using a thermal oil filter emptying device system for a trough type solar thermal power station, the system comprising a thermal oil filter I, a thermal oil pump II, a power generation module III and an expansion tank IV, wherein the thermal oil expansion tank IV is connected to the thermal oil filter I through a pipeline provided with a manual butterfly valve A (16), and the other end of the thermal oil filter I is connected to the thermal oil pump II through a pipeline provided with a manual butterfly valve B (17); the other end of the thermal oil pump II is connected to the power generation module III through a pipeline provided with a check valve C (18) and a pneumatic regulating butterfly valve A (19); the other end of the power generation module III is connected to the expansion tank IV through a pipeline provided with a pneumatic regulating butterfly valve B (20); the method is characterized in that: The system also comprises a discharge tank (21), the discharge tank (21) being connected to the heat transfer oil filter screen I through a pipeline; the discharge tank (21) being connected to the heat transfer oil filter screen I through a pipeline provided with a fifth manual stop valve (5) and a fourth manual stop valve (4); the discharge tank (21) being connected to the heat transfer oil filter screen I through a pipeline provided with a twelfth manual stop valve (12), an exhaust fan (25), a third manual stop valve (3) and a first manual stop valve 1 in sequence; the discharge tank (21) being connected to the activated carbon filter (24) through a pipeline provided with a twelfth manual stop valve (12), an exhaust fan (25), a check valve A (13) and a second manual stop valve (2); the discharge tank (21) being connected to the heat transfer oil filter screen I through a pipeline provided with a fifteenth manual stop valve (15); The discharge tank (21) is connected to the thermal oil filter screen I through a pipeline provided with a ninth manual stop valve (9), a thermal oil return pump (23), a check valve B (14), a pneumatic regulating valve (10) and an eleventh manual stop valve (11) in sequence; the discharge tank (21) is connected to the pressure instrument (26) through a pipeline provided with a sixth manual stop valve (6); the discharge tank (21) is also connected to the liquid level instrument (27) through a pipeline provided with a seventh manual stop valve (7); the discharge tank (21) is also connected to the nitrogen charging interface (28) through a pipeline provided with an eighth manual stop valve (8); a heater installation insertion hole is provided on one side of the discharge tank (21), and the electric heating device (22) is inserted into the heater installation insertion hole and connected via a flange; A method for a thermal oil filter emptying device system for a trough type solar thermal power station, comprising: step 1. a filter quick oil draining step; step 2. a micro-negative pressure opening step after the thermal oil filter is drained; step 3. a nitrogen replacement step after the thermal oil filter is cleaned; and step 4. a thermal oil injection step after the nitrogen replacement is completed.

2. A method for a thermal oil filter emptying device system for a trough type solar thermal power station according to claim 1, characterized in that: The filter screen quick oil drainage step in step 1 includes: Open the first manual stop valve, the third manual stop valve, the fourth manual stop valve, and the fifth manual stop valve to balance the pressure of the thermal oil pump II and the discharge tank, and the thermal oil in the thermal oil filter I begins to flow into the discharge tank by gravity; start the exhaust fan, and draw the gas in the discharge tank into the upper part of the thermal oil filter I at the inlet of the thermal oil pump II. The discharge tank is negatively pressurized, and the upper part of the thermal oil filter I is positively pressurized, thereby accelerating the discharge of the thermal oil in the thermal oil filter I into the discharge tank; when the thermal oil level in the discharge tank remains unchanged, the thermal oil in the thermal oil filter I is completely discharged; The step of opening the heat transfer oil filter under slight negative pressure after the oil is drained in step 2 comprises: After the heat transfer oil in the heat transfer oil filter I is emptied, adjust the second manual stop valve and close the third manual stop valve at the same time to maintain a slight negative pressure in the discharge tank, and open the heat transfer oil filter I at the inlet of the heat transfer oil pump II; The nitrogen replacement step after the thermal oil filter screen 1 is cleaned in step 3 comprises: After the thermal oil filter screen I is cleaned, the filter screen is installed, and the inspection flange is closed; the exhaust fan is turned off, and the eighth manual stop valve of the nitrogen injection interface is opened, the first manual stop valve, the second manual stop valve, the third manual stop valve, the fourth manual stop valve, the fifth manual stop valve, and the eighth manual stop valve are opened, and the twelfth manual stop valve is closed to replace the thermal oil filter screen I with nitrogen, and the nitrogen replacement is completed; The step of injecting heat transfer oil after nitrogen replacement is completed in step 4 includes: After nitrogen replacement is completed, close the first manual stop valve, the second manual stop valve, the third manual stop valve, the fourth manual stop valve, the fifth manual stop valve and the eighth manual stop valve, open the ninth manual stop valve, the pneumatic regulating valve, the eleventh manual stop valve and the fifteenth manual stop valve, start the thermal oil return pump, and discharge the thermal oil in the discharge tank into the thermal oil filter I at the inlet of the thermal oil pump II, start the thermal oil return pump, and pump the thermal oil discharged from the thermal oil filter I into the discharge tank into the thermal oil filter I.

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