Prefabricated septic tank for transformer substation and control method

Abstract

The invention provides a prefabricated septic tank for a transformer substation, and belongs to the technical field of septic tank leakage prevention. Comprising a septic tank, a biogas purification tank connected with the septic tank, a biogas collection chamber connected with the biogas purification tank, a leakage protection chamber arranged outside the biogas collection chamber and a leakage concentration chamber connected with the leakage protection chamber, marsh gas generated by the septic tank is collected by the marsh gas collection chamber after passing through the marsh gas purification chamber and being purified; a biogas detection module and a ventilation system are arranged in the leakage protection chamber; and the ventilation system is connected with the leakage concentration chamber. According to the prefabricated septic tank for the transformer substation, provided by the invention, when the detection module detects that biogas leakage occurs in the biogas collection chamber, the air exchange system concentrates biogas in the leakage protection chamber into the leakage concentration chamber, so that maintenance personnel are prevented from entering the leakage protection chamber to be poisoned.

Description

Technical Field

[0001] The present invention belongs to the technical field of septic tank leakage prevention, and more specifically, relates to a prefabricated septic tank for a transformer substation and a control method thereof. Background Art

[0002] In places such as substations, septic tanks are usually required to treat domestic sewage. Traditional septic tank construction methods often have problems such as long construction period and high labor intensity, which not only affects the overall construction progress of the substation, but also increases construction costs. In order to improve the construction efficiency of septic tanks, prefabricated panels are usually used to build septic tanks.

[0003] Septic tanks constructed with prefabricated panels have the following defects: the walls of the septic tanks are not cast in one piece, and there are many joints on the walls constructed with prefabricated panels, and the structural strength of the joints is different from that of other locations. The joints are prone to defects under high pressure, and there is a potential risk of biogas leakage, which will not only pollute the environment, such as releasing greenhouse gases such as methane and affecting air quality, but may also cause safety hazards, such as explosions caused by fire when biogas accumulation reaches the explosion limit, which seriously threatens the normal operation of the substation and the lives of the staff. Summary of the invention

[0004] The purpose of the present invention is to provide a prefabricated septic tank for a substation and a control method, aiming to solve the potential safety hazard of methane leakage in existing prefabricated septic tanks.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] In a first aspect, a prefabricated septic tank for a substation is provided, comprising: a septic tank, a biogas purification tank connected to the septic tank, a biogas collection chamber connected to the biogas purification tank, a leakage protection chamber arranged outside the biogas collection chamber, and a leakage concentration chamber connected to the leakage protection chamber; biogas generated by the septic tank is collected by the biogas collection chamber after passing through the biogas purification chamber and being purified;

[0007] A biogas detection module and a ventilation system are provided inside the leakage protection chamber; the ventilation system is connected to the leakage concentration chamber; when the biogas detection module detects biogas leakage in the leakage protection chamber, the ventilation system concentrates the gas in the leakage protection chamber into the leakage concentration chamber.

[0008] In a possible implementation, the ventilation system includes a fresh air inlet arranged in the leakage protection chamber, a centralized channel connecting the leakage protection chamber and the leakage concentration chamber, and a fan device; the fan device is used to drive the gas in the leakage protection chamber into the leakage concentration chamber through the centralized channel and to allow the outside air to enter the leakage protection chamber through the fresh air inlet.

[0009] In a possible implementation, a one-way valve is provided at the fresh air inlet, and the one-way valve only allows air outside the leakage protection chamber to enter the interior of the leakage protection chamber through the fresh air inlet.

[0010] In a possible implementation, the biogas detection module includes:

[0011] a detection module, arranged in the leakage protection chamber, for detecting whether biogas leakage occurs in the biogas concentration chamber; if the detection module detects that biogas leakage occurs in the biogas concentration chamber, a leakage signal is output; and

[0012] The control module is in communication connection with the detection module and the fan device; after receiving the leakage signal, the control module controls the fan device to operate.

[0013] In a possible implementation, the detection module includes a biogas sensor disposed inside the leakage protection chamber, the biogas sensor is communicatively connected to the control module, and when the biogas sensor detects the presence of biogas inside the leakage protection chamber, the biogas sensor outputs a leakage signal to the control module.

[0014] In a possible implementation, the detection module also includes warp threads and weft threads and a strain sensor arranged on the outer side of the biogas collection chamber; the warp threads are arranged along the vertical direction on the side of the biogas collection chamber; the weft threads are arranged along the horizontal direction on the side of the biogas collection chamber; the warp threads and the weft threads correspond to the strain sensor one by one, and the strain sensor is used to detect the deformation of the warp threads or the weft threads; the strain sensor is communicatively connected to the control module; the strain sensor transmits the deformation information of the warp threads or the weft threads to the control module so that the control module can judge the biogas.

[0015] In a possible implementation, an inspection door is provided on the leakage protection chamber to facilitate maintenance of the biogas collection chamber.

[0016] The beneficial effect of the prefabricated septic tank for a substation provided by the present invention is that: compared with the prior art, the prefabricated septic tank for a substation of the present invention purifies the biogas generated in the septic tank through a biogas purification tank, removes impurities in the biogas, and then collects and concentrates the purified biogas in a biogas concentration chamber. If a leak occurs in the biogas concentration chamber, the leaked biogas will be collected together by the leakage protection chamber. The biogas leakage chamber will prevent the diffusion of biogas, thereby ensuring the safety of the substation. When the detection module detects a biogas leak in the biogas collection chamber, the ventilation system concentrates the biogas in the leakage protection chamber into the leakage concentration chamber, thereby keeping the air in the leakage protection chamber fresh and preventing maintenance personnel from entering the leakage protection chamber and being poisoned.

[0017] In a second aspect, a control method for a prefabricated septic tank for a substation is provided, which is applied to the prefabricated septic tank for a substation as described in the first aspect, and comprises the following steps:

[0018] Determine whether there is leakage in the biogas collection chamber; and

[0019] If leakage occurs in the biogas collecting tank, the ventilation system is controlled to operate so as to concentrate the biogas in the leakage protection chamber into the leakage concentration chamber.

[0020] In a possible implementation, determining whether a biogas collection chamber leaks includes:

[0021] Determine whether there is biogas in the biogas collection chamber; and

[0022] Determine whether the biogas collection chamber is deformed; if there is biogas in the biogas collection chamber or the biogas collection chamber.

[0023] In a possible implementation, determining whether the biogas collection chamber is deformed includes:

[0024] Collecting deformation information on the side wall of the biogas collection chamber;

[0025] The deformation information is compared with a deformation threshold. If the deformation information exceeds the deformation threshold, it is determined that the deformation of the biogas collection chamber is too large and leakage occurs.

[0026] The beneficial effect of the control method for the prefabricated septic tank for the substation provided by the present invention is that compared with the prior art, the control method for the prefabricated septic tank for the substation provided by the present invention, when a biogas leakage is detected in the biogas collection chamber, concentrates the biogas in the leakage protection chamber into the leakage concentration chamber, thereby keeping the air in the leakage protection chamber fresh and preventing maintenance personnel from entering the leakage protection chamber and being poisoned. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structure of a prefabricated septic tank for a substation provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the main steps of a control method for a prefabricated septic tank for a substation provided by an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of the main steps of determining whether a biogas collection chamber is leaking provided by an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of the main steps of determining whether a biogas collection chamber is deformed provided in an embodiment of the present invention.

[0032] Description of reference numerals:

[0033] 1. Septic tank; 2. Biogas purification tank; 3. Biogas collection room; 4. Leakage protection room; 5. Leakage concentration room; 6. Fresh air outlet; 7. Concentrated channel; 8. Fan device; 9. One-way valve. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] Reference Figure 1 and Figure 4 Now, the prefabricated septic tank for substation and the control method provided by the present invention are described.

[0036] Reference Figure 1 In a first aspect, a prefabricated septic tank 1 for a substation is provided, comprising: a septic tank 1, a biogas purification tank 2 connected to the septic tank 1, a biogas collection chamber 3 connected to the biogas purification tank 2, a leakage protection chamber 4 arranged outside the biogas collection chamber 3, and a leakage concentration chamber 5 connected to the leakage protection chamber 4; biogas generated by the septic tank 1 is collected by the biogas collection chamber 3 after passing through the biogas purification chamber and being purified;

[0037] The leakage protection chamber 4 is provided with a biogas detection module and a ventilation system; the ventilation system is connected to the leakage concentration chamber 5; when the biogas detection module detects biogas leakage in the leakage protection chamber 4, the ventilation system concentrates the gas in the leakage protection chamber 4 into the leakage concentration chamber 5.

[0038] The main process of biogas formation in septic tank 1 is as follows: organic matter in septic tank 1 is fermented and decomposed by anaerobic bacteria and other microorganisms under anaerobic conditions to produce biogas. The main components of biogas are methane (CH 4 ), accounting for about 50%-70%; carbon dioxide (CO 2 ), accounting for about 30%-40%; there are also small amounts of hydrogen sulfide (H2S), nitrogen (N 2 ) and other gases. Among them, methane is the main combustible component of biogas, which can generate heat when burned; carbon dioxide mainly plays a diluting role; hydrogen sulfide and other gases have a pungent smell and are toxic to a certain extent. After biogas is generated, it needs to be collected and purified before it can be used.

[0039] In a preferred embodiment, the biogas purification tank 2 uses a water washing method to purify the biogas. The principle of the water washing method is to use water to dissolve and wash the impurities in the biogas. Specifically, the biogas is passed through a water layer, and the impurities are absorbed or dissolved by the water, thereby achieving the purification of the biogas. However, the water washing method has certain disadvantages. Its purification effect is limited, and the removal effect is poor for some impurities with poor solubility, and it may cause the water content in the biogas to increase, affecting subsequent utilization.

[0040] In a preferred embodiment, the biogas purification tank 2 uses a chemical absorption method to purify biogas. The principle of the chemical absorption method is to use a specific chemical absorbent to react chemically with impurities in the biogas to remove the impurities. This method has the advantage of a good purification effect and can effectively remove a variety of impurities. However, it also has some disadvantages, namely, it requires the use of chemical absorbents, there are problems with the regeneration and treatment of absorbents, the cost is high, and secondary pollution may occur.

[0041] In one embodiment, the absorbent is calcium hydroxide, which reacts with carbon dioxide in biogas to generate calcium carbonate precipitate and water. Calcium hydroxide has the following advantages: it is widely available and cheap, and has a good effect on removing carbon dioxide from biogas. However, it also has disadvantages: its absorption capacity is limited, requiring a large amount of absorbent; a large amount of precipitation is generated during the absorption process, which is troublesome to deal with later; and its absorption efficiency gradually decreases over time.

[0042] In another embodiment, the absorbent is sodium hydroxide, which can react with acidic gases (such as carbon dioxide, hydrogen sulfide (H2S), etc.) in biogas, react with carbon dioxide to form sodium carbonate and water, and react with hydrogen sulfide to form sodium sulfide and water. The advantages of sodium hydroxide are: strong absorption capacity for acidic gases, good purification effect, and fast reaction speed. But it also has disadvantages: it is highly corrosive and will cause certain corrosion to equipment and pipelines, so anti-corrosion measures need to be taken; and the price of sodium hydroxide is relatively high, and the cost of use is relatively high.

[0043] In another embodiment, the absorbent is ammonia water, which can react with carbon dioxide in biogas to generate ammonium carbonate and water. The advantages of ammonia water are: it has a good absorption effect, can remove some acidic gases and hydrogen sulfide in biogas at the same time, has a certain sterilization and disinfection effect, and is relatively cheap. Its disadvantages are: ammonia water is volatile and will produce odor; there are certain safety hazards during transportation and storage; and the solution produced after absorption is relatively complicated to handle.

[0044] In a preferred embodiment, the biogas purification tank 2 uses a solid absorption method to purify biogas. The principle of the solid absorption method is to use a solid adsorbent to adsorb impurities in biogas. Common adsorbents include activated carbon, molecular sieves, etc. This purification method has the following advantages: high purification efficiency, the ability to selectively adsorb specific impurities, and the adsorbent can be reused; but it also has some disadvantages, such as the limited adsorption capacity of the adsorbent, which needs to be replaced or regenerated regularly, and the equipment is relatively complex and the investment cost is high.

[0045] In one embodiment, the solid adsorbent is activated carbon. Activated carbon has a huge specific surface area and rich microporous structure. It can adsorb impurity gases in biogas, such as hydrogen sulfide and carbon dioxide, by physical adsorption, relying on the van der Waals force between molecules. Its advantages include: strong adsorption performance, good adsorption effect on various impurity gases, especially significant removal effect on hydrogen sulfide; high mechanical strength, not easy to break; good regeneration performance, and can be reused after proper regeneration treatment. Its disadvantages are: limited adsorption capacity, with the increase of use time, the adsorption capacity will gradually decrease; the price is relatively high, resulting in increased purification costs; in high temperature and high humidity environment, the adsorption performance may be affected to a certain extent.

[0046] In one embodiment, the solid adsorbent is a molecular sieve. Molecular sieve is a solid adsorbent with a uniform microporous structure. Its micropore size is precise and can selectively adsorb according to the size and shape of the molecules. For impurity gases in biogas, such as carbon dioxide, hydrogen sulfide, etc., molecular sieves can adsorb and separate them through molecular sieving. Its advantages are: high adsorption selectivity, can accurately separate molecules of a specific size; large adsorption capacity, unit mass of molecular sieve has a high adsorption capacity; good thermal stability and chemical stability, can be used under a wide range of temperature and acid-base conditions. Its disadvantages are: high regeneration temperature, usually need to be regenerated at a high temperature of 300-500℃, high energy consumption; high preparation cost, relatively expensive; sensitive to moisture, adsorption performance will decrease in a humid environment.

[0047] In one embodiment, the solid adsorbent is activated alumina. The surface of activated alumina has a large number of active groups such as hydroxyl groups, which can adsorb moisture and some acidic gases in biogas through chemical adsorption. It can react with moisture to form aluminum hydroxide and react with acidic gases to form corresponding salts. Its advantages are: it has a strong adsorption capacity for moisture and is an excellent desiccant; the adsorption speed is fast and can achieve a high adsorption efficiency in a short time; the mechanical strength is good and it is not easy to pulverize; the price is relatively low and the cost is relatively economical. Its disadvantages are: the adsorption capacity for acidic gases such as hydrogen sulfide is relatively small, and it is difficult to meet the purification requirements of various impurity gases when used alone; the regeneration performance is relatively poor, and the adsorption performance will decrease after multiple regenerations.

[0048] The prefabricated septic tank 1 for a substation provided by the present invention has the following beneficial effects: compared with the prior art, the prefabricated septic tank 1 for a substation in the present invention can purify the biogas generated by the septic tank 1 through a biogas purification tank 2 and collect it in a biogas collection chamber 3. In addition, a biogas detection module and a ventilation system are provided in the leakage protection chamber 4. Once a biogas leakage is detected in the leakage protection chamber 4, the ventilation system can concentrate the leaked biogas into the leakage concentration chamber 5. In this way, it is possible to effectively avoid biogas leakage from polluting the environment and causing safety hazards, and ensure the normal operation of the substation and the life safety of the staff. Moreover, the structural connection of each part of the prefabricated septic tank 1 is reasonable, which can realize the effective treatment and protection of biogas. When the detection module detects that a biogas leakage occurs in the biogas collection chamber 3, the ventilation system concentrates the biogas in the leakage protection chamber 4 into the leakage concentration chamber 5, so that the air in the leakage protection chamber 4 remains fresh, and maintenance personnel are prevented from entering the leakage protection chamber 4 and being poisoned.

[0049] In a possible implementation, the ventilation system includes a fresh air inlet 6 arranged in the leakage protection chamber 4, a centralized channel 7 connecting the leakage protection chamber 4 and the leakage concentration chamber 5, and a fan device 8; the fan device 8 is used to drive the gas in the leakage protection chamber 4 into the leakage concentration chamber through the centralized channel 7 and to allow the outside air to enter the leakage protection chamber 4 through the fresh air inlet 6.

[0050] In a possible implementation, a one-way valve 9 is provided at the fresh air inlet 6 , and the one-way valve 9 only allows air outside the leakage protection chamber 4 to enter the interior of the leakage protection chamber 4 through the fresh air inlet 6 .

[0051] In a possible implementation, the biogas detection module includes:

[0052] a detection module, arranged in the leakage protection chamber 4, for detecting whether biogas leakage occurs in the biogas concentration chamber; if the detection module detects that biogas leakage occurs in the biogas concentration chamber, a leakage signal is output; and

[0053] The control module is in communication connection with the detection module and the fan device 8; after receiving the leakage signal, the control module controls the fan device 8 to operate.

[0054] In a possible implementation, the detection module includes a biogas sensor arranged inside the leakage protection chamber 4, and the biogas sensor is communicatively connected to the control module. When the biogas sensor detects the presence of biogas inside the leakage protection chamber 4, the biogas sensor outputs a leakage signal to the control module.

[0055] In a possible implementation, the detection module also includes warp threads and weft threads and a strain sensor arranged on the outer side of the biogas collection chamber 3; the warp threads are arranged along the vertical direction on the side of the biogas collection chamber 3; the weft threads are arranged along the horizontal direction on the side of the biogas collection chamber 3; the warp threads and the weft threads correspond one-to-one to the strain sensor, and the strain sensor is used to detect the deformation of the warp threads or the weft threads; the strain sensor is communicatively connected to the control module; the strain sensor transmits the deformation information of the warp threads or the weft threads to the control module so that the control module can judge the biogas.

[0056] The number of strain sensors is the same as the total number of warp and weft threads, and the strain sensors correspond to the warp and weft threads one by one. The strain sensors for detecting the warp threads and the strain sensors for detecting the weft threads are numbered respectively, and the strain sensors for detecting the warp threads are numbered as X1, X2, X3, etc., and the strain sensors for detecting the weft threads are numbered as Y1, Y2, Y3, etc. When the strain sensor detects that the warp or weft thread is deformed, the deformation information is connected to its own number as deformation information and sent to the control module. The control module can determine which area of ​​the biogas concentration chamber has undergone a larger deformation based on the deformation information, thereby determining that biogas leakage may occur in this area.

[0057] In a possible implementation, an inspection door is provided on the leakage protection chamber 4 to facilitate maintenance of the biogas collection chamber 3 .

[0058] The beneficial effect of the prefabricated septic tank 1 for a substation provided by the present invention is that: compared with the prior art, the prefabricated septic tank 1 for a substation of the present invention purifies the biogas generated in the septic tank 1 through the biogas purification tank 2, removes impurities in the biogas, and then collects and concentrates the purified biogas in the biogas concentration chamber. If a leak occurs in the biogas concentration chamber, the leaked biogas will be collected together by the leakage protection chamber 4. The biogas leakage chamber will prevent the diffusion of biogas, thereby ensuring the safety of the substation. When the detection module detects a biogas leak in the biogas collection chamber 3, the ventilation system concentrates the biogas in the leakage protection chamber 4 into the leakage concentration chamber 5, so that the air in the leakage protection chamber 4 remains fresh, and maintenance personnel are prevented from entering the leakage protection chamber 4 and being poisoned.

[0059] Reference Figure 2 In a second aspect, a control method for a prefabricated septic tank 1 for a substation is provided, which is applied to the prefabricated septic tank 1 for a substation as described in the first aspect, and comprises the following steps:

[0060] S1. Determine whether the biogas collection chamber 3 leaks; and

[0061] S2. If a leak occurs in the biogas collection tank, the ventilation system is controlled to operate so as to concentrate the biogas in the leakage protection chamber 4 into the leakage concentration chamber 5 .

[0062] Reference Figure 3 In a possible implementation, determining whether the biogas collection chamber 3 leaks includes:

[0063] S11. Determine whether there is biogas in the biogas collection chamber 3; and

[0064] S12. Determine whether the biogas collecting chamber 3 is deformed; if there is biogas in the biogas collecting chamber 3 or the biogas collecting chamber 3 .

[0065] Reference Figure 4In a possible implementation, determining whether the biogas collection chamber 3 is deformed includes:

[0066] S121. Collecting deformation information on the side wall of the biogas collection chamber 3;

[0067] S122. Compare the deformation information with the deformation threshold. If the deformation information exceeds the deformation threshold, it is determined that the deformation of the biogas collection chamber 3 is too large and leakage has occurred.

[0068] The beneficial effect of the control method of the prefabricated septic tank 1 for a substation provided by the present invention is that compared with the prior art, the control method of the prefabricated septic tank 1 for a substation provided by the present invention, when a biogas leakage is detected in the biogas collection chamber 3, concentrates the biogas in the leakage protection chamber 4 into the leakage concentration chamber 5, thereby keeping the air in the leakage protection chamber 4 fresh and preventing maintenance personnel from entering the leakage protection chamber 4 and being poisoned.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A prefabricated septic tank (1) for a substation, characterized in that: The invention comprises a septic tank (1), a biogas purification tank (2) connected to the septic tank (1), a biogas collection chamber (3) connected to the biogas purification tank (2), a leakage protection chamber (4) arranged outside the biogas collection chamber (3), and a leakage concentration chamber (5) connected to the leakage protection chamber (4); the biogas generated by the septic tank (1) passes through the biogas purification chamber and is purified before being collected by the biogas collection chamber (3); The leakage protection chamber (4) is provided with a biogas detection module and a ventilation system; the ventilation system is connected to the leakage concentration chamber (5); when the biogas detection module detects biogas leakage in the leakage protection chamber (4), the ventilation system concentrates the gas in the leakage protection chamber (4) into the leakage concentration chamber (5).

2. The prefabricated septic tank (1) for a substation according to claim 1, characterized in that: The ventilation system comprises a fresh air inlet (6) arranged in the leakage protection chamber (4), a concentrated channel (7) connecting the leakage protection chamber (4) and the leakage concentration chamber (5), and a fan device (8); the fan device (8) is used to drive the gas in the leakage protection chamber (4) to enter the leakage concentration chamber through the concentrated channel (7) and to allow external air to enter the leakage protection chamber (4) through the fresh air inlet (6).

3. The prefabricated septic tank (1) for a substation according to claim 2, characterized in that: A one-way valve (9) is provided at the fresh air inlet (6), and the one-way valve (9) only allows air outside the leakage protection chamber (4) to enter the interior of the leakage protection chamber (4) through the fresh air inlet (6).

4. The prefabricated septic tank (1) for a substation according to claim 2, characterized in that: The biogas detection module comprises: a detection module, arranged in the leakage protection chamber (4), for detecting whether biogas leakage occurs in the biogas concentration chamber; if the detection module detects that biogas leakage occurs in the biogas concentration chamber, a leakage signal is output; and A control module is communicatively connected with the detection module and the fan device (8); after receiving the leakage signal, the control module controls the fan device (8) to operate.

5. The prefabricated septic tank (1) for a substation according to claim 4, characterized in that: The detection module comprises a biogas sensor arranged inside the leakage protection chamber (4), the biogas sensor being in communication connection with the control module, and when the biogas sensor detects the presence of biogas inside the leakage protection chamber (4), the biogas sensor outputs a leakage signal to the control module.

6. The prefabricated septic tank (1) for a substation according to claim 5, characterized in that: The detection module also includes warp threads and weft threads and a strain sensor arranged on the outer side of the biogas collection chamber (3); the warp threads are arranged along the vertical direction on the side of the biogas collection chamber (3); the weft threads are arranged along the horizontal direction on the side of the biogas collection chamber (3); the warp threads and the weft threads correspond to the strain sensor one by one, and the strain sensor is used to detect the deformation of the warp threads or the weft threads; the strain sensor is communicatively connected to the control module; the strain sensor transmits the deformation information of the warp threads or the weft threads to the control module so that the control module can judge the biogas.

7. The prefabricated septic tank (1) for a substation according to any one of claims 1 to 6, characterized in that: The leakage protection chamber (4) is provided with an inspection door to facilitate maintenance of the biogas collection chamber (3).

8. A control method for a prefabricated septic tank (1) for a substation, applied to the prefabricated septic tank (1) for a substation as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: Determining whether the biogas collection chamber (3) is leaking; and If a leak occurs in the biogas collection tank, the ventilation system is controlled to operate so as to collect the biogas in the leakage protection chamber (4) into the leakage collection chamber (5).

9. The control method of the prefabricated septic tank (1) for a substation according to claim 8, characterized in that: Determine whether the biogas collection chamber (3) has leaked, including: Determining whether biogas exists in the biogas collection chamber (3); and Determine whether the biogas collection chamber (3) is deformed; if biogas exists in the biogas collection chamber (3) or the biogas collection chamber (3).

10. The control method of the prefabricated septic tank (1) for a substation according to claim 9, characterized in that: Determining whether the biogas collection chamber (3) is deformed includes: Collecting deformation information on the side wall of the biogas collection chamber (3); The deformation information is compared with a deformation threshold, and if the deformation information exceeds the deformation threshold, it is determined that the deformation of the biogas collection chamber (3) is too large and leakage has occurred.

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