Rainwater monitoring pool and accident pool combined system and drainage method

Abstract

The application provides a rainwater monitoring pool and an accident water pool combined system, which comprises a rainwater monitoring pool, a multi-grid accident water pool and an accident water lifting pool; a rainwater lifting pump is arranged in the rainwater monitoring pool, an outlet of the rainwater lifting pump is provided with two pipelines, the two pipelines are respectively connected with an off-site rainwater system and the accident water pool, online water quality detection is arranged in the rainwater monitoring pool, an electric gate is arranged between each accident water pool and the rainwater lifting pool, an accident water lifting pump is arranged in the accident water lifting pool, an outlet of the accident water lifting pump is provided with two pipelines, the two pipelines are respectively connected with a sewage treatment plant and an accident water diversion pool. The system automatically detects rainwater of the rainwater pool, directly lifts qualified and clean rainwater to off-site, lifts unqualified rainwater to the accident water pool for temporary storage, and then lifts the unqualified rainwater to the sewage treatment plant for treatment; the accident water pool is divided into grids, and the volume of the first grid is not more than 1 / 3 of the total effective volume of the accident water pool.

Description

Technical Field

[0001] This invention belongs to the field of water supply and drainage technology, and relates to a combined system of rainwater monitoring tank and emergency water tank and drainage method. Background Technology

[0002] Petrochemical enterprises should establish an effective comprehensive prevention and control system for water environment risks to ensure that all accident drainage is under control. Accident water tanks primarily collect production accident wastewater, fire-fighting wastewater, and initial rainwater. To ensure that accident water tanks are not used for other purposes, the "Technical Requirements for Water Environment Risk Prevention and Control in Petrochemical Enterprises" (QSH 0729-2018) stipulates that when an accident water tank needs to be occupied in a non-accident state, the occupied volume should not exceed 1 / 3. Currently, accident water tanks are generally large pools, making it difficult to visually determine whether the occupied volume exceeds 1 / 3 in a non-accident state, which can easily lead to excessively large accident water tank volumes in non-accident states.

[0003] Before rainwater is discharged from the factory boundary, a monitoring pool should be set up. The monitoring pool should have facilities to cut off and return substandard rainwater. Rainwater monitoring pools should be set up throughout the factory to monitor the quality of clean rainwater discharged from the factory area and to improve rainwater quality. Clean rainwater from each area of ​​the factory area after separation of clean and wastewater flows into the rainwater monitoring pool. In theory, all clean rainwater meets the standards and can be discharged directly. However, in reality, many factors may cause clean rainwater to fail to meet the standards, such as: (1) the initial rainwater interception pool is designed to be too small; (2) the rainwater and wastewater switching device is manually controlled, resulting in a delayed response and some substandard initial rainwater overflows and is discharged; (3) the pollution collection area is not set up properly, and some areas that may generate leakage and pollution and are subject to rain erosion do not consider the interception of initial rainwater. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a combined system and drainage method for a rainwater monitoring tank and an emergency water tank. The invention guides rainwater entering the rainwater tank via automatic detection. Clean rainwater that meets standards is directly pumped outside the plant, while substandard rainwater is temporarily stored in the emergency water tank and then pumped to a wastewater treatment plant for further treatment. Emergency wastewater is directly pumped from the rainwater monitoring tank to the emergency water tank. Because the emergency water tank is divided into compartments, the volume of the first compartment does not exceed 1 / 3 of the total effective volume of the emergency water tank. In non-emergency situations, if the first compartment of the emergency water tank is full, an electric gate is opened, and the water is pumped to the wastewater treatment plant for treatment via an emergency water lift pump.

[0005] The technical means employed in this invention are as follows:

[0006] A combined system for a rainwater monitoring tank and an emergency water tank includes a rainwater monitoring tank, a multi-compartment emergency water tank, and an emergency water lifting tank. The rainwater monitoring tank has a mechanical bar screen at its inlet. A rainwater lifting pump is installed within the rainwater monitoring tank, and two pipelines are connected to the outlet of the pump, respectively connecting to an external rainwater system and the emergency water tank. Each pipeline is equipped with an electric valve to control its on / off state. An online water quality analyzer is installed within the rainwater monitoring tank and connected to a control system. Based on the analyzer's results, the control system determines whether the water entering the rainwater monitoring tank is emergency wastewater, substandard clean rainwater, or compliant clean rainwater, and then controls the opening and closing of each electric valve accordingly. An electric gate is installed between each emergency water tank and the rainwater lifting tank. An emergency water lifting pump is installed within the emergency water lifting tank, and two pipelines are connected to the outlet of the pump, respectively connecting to a wastewater treatment plant and an emergency water diversion tank. A manual gate is installed between the emergency water tank and the rainwater monitoring tank.

[0007] Preferably, the rainwater monitoring tank, the emergency water lifting tank, and the emergency water tank are all equipped with level gauges, and the level gauges are connected to the control system.

[0008] Preferably, overflow holes are provided between multiple accident water pools.

[0009] Preferably, a bar screen is provided in front of the rainwater monitoring pool, and the bar screen is located between the bar screen and the rainwater monitoring pool.

[0010] This invention also discloses a drainage method for an emergency water tank combined with a rainwater monitoring tank under rainfall conditions, the specific steps of which are as follows:

[0011] Step 1: After the initial rainwater interception, the rainwater flows by gravity into the bar screen pool through the rainwater pipe network. Large floating objects are intercepted by the mechanical bar screen, and then the rainwater enters the rainwater monitoring pool.

[0012] Step 2: The water quality tester detects the rainwater quality online. If it meets the rainwater discharge standards, the rainwater lift pump discharges the rainwater outside the plant. If it does not meet the rainwater discharge standards, the rainwater lift pump lifts the rainwater to the emergency water tank.

[0013] Step 3: After the rainfall ends, open the electric gate according to the water level of the accident water tank. The substandard rainwater will enter the accident water lifting tank from the accident water tank, and the accident water lifting pump will lift the substandard rainwater to the sewage treatment plant for treatment.

[0014] Preferably, in step 1, the rainwater stays in the rainwater monitoring tank for 10 minutes.

[0015] Preferably, in step 2, as time goes by, the amount of rainwater in the rainwater monitoring tank increases, the water quality gradually improves, and after meeting the rainwater discharge standards, the rainwater lift pump discharges the rainwater outside the factory.

[0016] This invention also discloses a drainage method for an emergency water tank combined with a rainwater monitoring tank under accident conditions, the specific steps of which are as follows:

[0017] Step 1: The floodwater is collected by the rainwater harvesting system, enters the rainwater monitoring tank, and is then pumped to the emergency water tank by the rainwater lift pump.

[0018] Step 2: The accident water overflows into other accident water pools through the overflow hole. When the accident water pool reaches the alarm level, the control room alarms and the electric gate is opened remotely. The accident water enters the accident water lift pool, and the accident water lift pump lifts the accident water to the accident water diversion pool.

[0019] Step 3: After the accident is over, the accident water will be manually tested. If the test fails, the relevant electric valves will be opened and the water will be pumped to the sewage treatment plant for treatment. If the test passes, the water will be returned to the rainwater monitoring tank through the manual gate and then discharged to the outside of the plant through the rainwater pump.

[0020] It is important to note that:

[0021] 1. The emergency water lifting pump station is designed for Class I load, with one set of pumps being the operating pumps, which are electric motor pumps, and the other set of pumps being the standby pumps, which are diesel engine pumps, for use in the event of a power outage.

[0022] 2. Both emergency water booster pumps 1 and 2 can be manually started / stopped on-site, and can be stopped by interlocking according to the liquid level. The pumps can also be stopped remotely from the control room.

[0023] 3. The clean rainwater system also serves as an emergency drainage collection system.

[0024] 4. The emergency water tank is divided into 3 compartments, which are connected by an overflow tunnel. When the emergency water tank a2 is full, it overflows into the emergency water tank b3 and the emergency water tank c4 in sequence. The emergency water tank c4 is equipped with a liquid level alarm.

[0025] 5. The first, second, and third electric gates are normally closed. Before the emergency water pump is started, the electric gates can be opened on-site according to the water level in the emergency water tank. The gates can also be opened / closed manually on-site.

[0026] 6. The manual gate is normally closed and serves as a backup channel connecting the emergency water tank and the rainwater monitoring tank, for use when the emergency water meets the standards and flows back to the rainwater monitoring tank.

[0027] 7. The first electric valve is a normally closed valve, the second electric valve is a normally open valve, and the third electric valve 15 and the fourth electric valve 16 are normally closed.

[0028] 8. All emergency water tanks in the plant are interconnected by pipelines. When the volume of one emergency water tank is insufficient, the emergency water will be pumped into other emergency water tanks. Alternatively, a joint prevention and control mechanism can be established with surrounding enterprises to interconnect emergency water tanks and improve prevention and control capabilities.

[0029] 9. The emergency water tank shall be divided into interconnected sections. The effective volume of emergency water tank a2 shall not exceed 1 / 3 of the total effective volume of the emergency water tank. Under non-accident conditions, if emergency water tank a2 is full, it shall be emptied in a timely manner to meet the requirement that the volume occupied by the emergency water tank shall not exceed 1 / 3 of the total volume of the emergency water tank under non-accident conditions.

[0030] 10. The overflow tunnel has dimensions of H×B=1m×2m. The bottom of the overflow tunnel in the front emergency water tank is level with the bottom of the tank, and the elevation of the bottom of the tunnel in the rear emergency water tank is determined according to the overflow water level.

[0031] The beneficial effects of this invention are:

[0032] (1) Effectively monitor clean rainwater. If the clean rainwater does not meet the standards, it shall be temporarily stored in the emergency water pool. Clean rainwater shall be discharged directly outside the factory.

[0033] (2) The water quality of the rainwater monitoring pool can be automatically controlled, reducing the risk of delay in manual detection, reducing the risk of substandard discharge quality, and effectively controlling the amount of clean rainwater entering the accident pool, thus reducing the treatment load of the sewage treatment plant.

[0034] (3) The emergency water tank is divided into compartments. The effective volume of the first compartment does not exceed 1 / 3 of the total effective volume of the emergency water tank. This allows for a direct assessment that, under non-accident conditions, the volume occupied by the emergency water tank does not exceed 1 / 3 of the total volume of the emergency water tank. This better controls the requirement that, under non-accident conditions, the volume occupied by the emergency water tank must not exceed 1 / 3 of the total volume of the emergency water tank.

[0035] (4) The emergency water tank is divided into sections, and the same emergency water pump stop water level is set so that the amount of water remaining in the emergency water tank after the pump stops is less, thus reducing the volume occupied during non-accident times.

[0036] (5) Combining rainwater monitoring tanks and emergency water tanks can reduce the overall volume and lower the project cost, thus providing certain economic benefits. Attached Figure Description

[0037] Figure 1 This is an overall structural diagram of the invention;

[0038] Figure 2 yes Figure 1 A magnified view of a section of section I;

[0039] Figure 3 yes Figure 1 Enlarged view of a section of section II;

[0040] Figure 4 yes Figure 1 AA cross-section view;

[0041] Figure 5 yes Figure 1 BB cross-section;

[0042] Figure 6 yes Figure 1 CC cross-section;

[0043] Figure 7 yes Figure 1 DD cross-section;

[0044] In the diagram, 1 is the rainwater monitoring tank, 2 is the emergency water tank a, 3 is the emergency water tank b, 4 is the emergency water tank c, 5 is the emergency water lifting tank, 6 is the bar screen tank, 7 is the water quality analyzer, 8 is the level gauge a, 9 is the level gauge b, 10 is the level gauge c, 11 is the rainwater lifting pump, 12 is the emergency water lifting pump, 13 is the first electric valve, 14 is the second electric valve, 15 is the third electric valve, 16 is the fourth electric valve, 17 is the manual gate, 18 is the first electric gate, 19 is the second electric gate, 20 is the third electric gate, 21 is the mechanical bar screen, 22 is the overflow hole, 23 is the vent, 24 is the manhole, 25 is the plant area rainwater pipe, 26 is the pipeline to the outside of the plant, 27 is the pipeline to the emergency water tank, 28 is the pipeline to the sewage treatment plant, 29 is the transfer pipeline, 30 is the rainwater lifting tank sump, 31 is the emergency water lifting tank sump, 32 is the reinforced concrete cover plate, and 34 is the control center DCS. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] like Figure 1-7As shown, this invention discloses a combined system for rainwater monitoring tanks and emergency water tanks. The emergency water tank in this system adopts a three-compartment interconnected structure. The system includes a rainwater monitoring tank 1, an emergency water tank a2, an emergency water tank b3, an emergency water tank c4, and an emergency water lifting tank 5. The rainwater monitoring tank 1 is used to monitor rainwater quality and lift rainwater. A bar screen 6 is installed in front of the rainwater monitoring tank, and a mechanical bar screen 21 is installed between the bar screen and the rainwater monitoring tank. An online water quality analyzer 7 is installed and connected to a control system DCS 34. Based on the test results of the water quality analyzer, it is determined whether the water entering the rainwater monitoring tank is emergency sewage, substandard clean rainwater, or standard clean rainwater. The control system then controls the opening and closing status of each electric valve. Standard clean rainwater is directly lifted and discharged outside the plant by the rainwater lifting pump 11 through the external pipeline 26. Emergency rainwater and substandard clean rainwater are switched and lifted into the emergency water tank a2 for storage. In non-accident conditions, depending on the water level of the accident water tank, the electric gate of the accident water lifting tank 5 is opened, and substandard rainwater enters the accident water lifting tank. The accident water lifting pump 12 then lifts the substandard clean rainwater to the sewage treatment plant via the sewage treatment plant pipeline 28. In the event of an accident, if the accident water volume is large, the level gauge C10 alarms and remotely opens the gate of the accident water lifting area. The accident water lifting pump then transfers the accident water to other connected accident water tanks, namely the accident water diversion tanks mentioned in the invention content of this application.

[0047] 2. This invention includes two operating conditions:

[0048] Operating Condition 1: During rainfall, the first 15 minutes of rainwater is considered initial rainwater. This initial rainwater is collected separately in the initial rainwater pool within the factory area. After 15 minutes of rain, the clean rainwater, having passed through the initial rainwater interception, flows by gravity from the factory's rainwater pipe 25 into the screen pool 6 of the rainwater monitoring pool 1. It first passes through the mechanical screen 21 to intercept large floating objects before entering the rainwater monitoring pool 1, where it remains for 10 minutes. Based on the data from the online monitoring instrument 7, if the rainwater discharge standards are not met, the rainwater is pumped to the emergency water pool a 2 by the rainwater lift pump 11. As time progresses and the water quality gradually improves, once the water quality meets the standards, the second electric valve 14 is interlocked and closed, while the first electric valve 13 is opened. The rainwater lift pump then pumps the clean rainwater to the outside of the factory via the external pipeline 26. After the rainfall ends, electric gates 18, 19, and 20 are opened according to the water level of emergency water tanks 2, 3, and 4. Emergency water lifting tank 5 is filled with water. Emergency water lifting pump 12 is started according to the signal fed back by level gauge c 12. Third electric valve 15 is opened and fourth electric valve 16 is closed, so that the substandard rainwater is lifted to the sewage treatment plant via pipeline 28 for treatment.

[0049] Scenario 2: In the event of an accident, the accident water is collected by the rainwater harvesting system and enters the rainwater monitoring tank 1. It is then pumped to the accident water tank a 2 by the rainwater lift pump 11. If the accident water volume is large, the accident water tanks are connected via overflow tunnel 22, and the accident water overflows sequentially into accident water tank b and accident water tank c. Accident water tank c is equipped with a level alarm gauge b9. When the level in accident water tank c4 reaches the alarm level, an alarm is triggered in the control room. The control center DCS remotely opens three electric gates. The accident water lift pump 12 starts based on the level signal fed back by the level gauge c10. The fourth electric valve 16 opens, and the third electric valve 15 closes, lifting the accident water to other accident water tanks. After the accident is over, the accident water will be manually tested. If the test is qualified, it will be returned to the rainwater monitoring pool 1 through the manual gate 17 and then discharged to the outside of the plant 26. If the test is unqualified, the electric gate will be opened according to the water filling status of the accident water pool, the accident water lifting pool 5 will be filled with water, and the accident water lifting pump 12 will start / stop the pump according to the signal fed back by the level gauge c 10, and lift the substandard rainwater to the sewage treatment plant 28 for treatment.

[0050] 1. The first, second and third electric gates are normally closed. Before the emergency water lift pump 12 is turned on, the electric gates can be opened on-site or remotely depending on the water level in the emergency water pool. The gates can be opened / closed manually on-site.

[0051] 2. The channel connected to manual gate 17 is a backup channel for the flow of water from the unqualified rainwater monitoring pool to the emergency water pool a2, for use in the event of a power outage.

[0052] 3. The rainwater monitoring tank 1 is equipped with a rainwater lifting pump 11 to lift substandard clean rainwater and accident water to the accident water tank a2; the accident water lifting tank is equipped with an accident water lifting pump 12 to transport accident water to the sewage treatment plant 28 or transfer it to other accident water tanks 29.

[0053] 4. The rainwater lift pump 11 and the emergency water lift pump 12 are connected to the control system DCS 34. Both the rainwater monitoring tank 1 and the emergency water lift tank 5 are equipped with level gauges a 8 and c 10. Based on the preset level, the pumps can be started / stopped in an interlocking manner, and the pumps can be started and stopped remotely and manually on-site.

[0054] 5. The emergency water booster pump is controlled by the start-up liquid level and the stop-up liquid level.

[0055] 6. Install reinforced concrete cover plates 32 in a localized area above the rainwater monitoring tank and above the emergency water lifting tank 5 for installing the pump body. Set up rainwater lifting tank collection pit 30 and emergency water lifting tank collection pit 31 at the pump suction pipe position to facilitate pump body water intake.

[0056] 7. The control system adopts DCS automatic control. When the "manual / automatic" switch on the field box is selected as "automatic", the DCS automatically collects data from the inlet TOD detector and level gauge. The setting of clean rainwater diversion and the drainage direction of the emergency water lift pump are automatically controlled by the DCS. The opening and closing of the rainwater lift pump, the emergency water lift pump and the electric gate are also controlled by the DCS.

[0057] 8. Manual control: When the DCS malfunctions or manual operation is required, select "Manual" on the "Manual / Automatic" switch on the field box, and then control the opening and closing of the electric valve through the start / stop button on the field box.

[0058] 9. The maximum delay time for the above detection and interlock valve opening shall not exceed 60 seconds. The specific delay time can be adjusted manually. The control center DCS is equipped with a display screen and operation panel, which can display the opening and closing status of the electric gate and the TOD detection value of the inlet water. The display screen can also display equipment fault signals and has control functions such as on-site manual modification of setting data.

[0059] 10. The spacing of the intercepting grille in this project is 5mm, and the material is SS304 stainless steel;

[0060] 11. The sump pit of the rainwater lifting tank and the sump pit of the emergency water lifting tank shall be at least 800mm lower than the bottom of the corresponding tank. In addition, the tank also includes a vent pipe 23 and a manhole 24.

Claims

1. A combined system for rainwater monitoring tanks and emergency water tanks, characterized in that, The system includes a rainwater monitoring tank (1), a multi-compartment emergency water tank, and an emergency water lifting tank (5). A mechanical screen (21) is installed at the inlet of the rainwater monitoring tank (1). A rainwater lifting pump (11) is installed inside the rainwater monitoring tank (1), and two pipelines are installed at the outlet of the rainwater lifting pump. The two pipelines are connected to the external rainwater system and the emergency water tank, respectively. Each pipeline is equipped with an electric valve to control the on / off state of the pipeline. An online water quality analyzer (7) is installed inside the rainwater monitoring tank. The online water quality analyzer is connected to a control system (34). Based on the water quality test results, the system determines whether the water entering the rainwater monitoring pool is emergency sewage, substandard clean rainwater, or compliant clean rainwater, and then controls the opening and closing status of each electric valve; each emergency water pool and emergency water lifting pool (5) is equipped with an electric gate, the emergency water lifting pool is equipped with an emergency water lifting pump (12), the outlet of the emergency water lifting pump is equipped with two pipelines, which are respectively connected to the sewage treatment plant and the emergency water diversion pool; a manual gate (17) is installed between the emergency water pool and the rainwater monitoring pool (1). The emergency water tank is divided into three compartments, and overflow holes are provided between the multiple emergency water tanks. The volume of the first compartment does not exceed 1 / 3 of the total effective volume of the emergency water tank. In non-accident conditions, if the first compartment of the emergency water tank is full, the electric gate is opened, and the water is lifted to the sewage treatment plant for treatment by the emergency water lift pump.

2. The combined rainwater monitoring tank and emergency water tank system according to claim 1, characterized in that, The rainwater monitoring tank, the emergency water lifting tank, and the emergency water tank are all equipped with level gauges, which are connected to the control system.

3. The combined rainwater monitoring tank and emergency water tank system according to claim 1, characterized in that, A screen tank is installed in front of the rainwater monitoring tank, and the screen is located between the screen tank and the rainwater monitoring tank.

4. A drainage method for a combined rainwater monitoring tank and emergency water tank system according to claim 3 under rainfall conditions, characterized in that, The specific steps are as follows: Step 1: After initial rainwater interception, the rainwater flows by gravity into the bar screen tank through the rainwater pipe network. Large floating objects are intercepted by the mechanical bar screen, and then the rainwater enters the rainwater monitoring tank. The rainwater stays in the rainwater monitoring tank for 10 minutes. Step 2: The water quality analyzer monitors the rainwater quality online. If it meets the rainwater discharge standards, the rainwater lift pump discharges the rainwater outside the plant. If it does not meet the rainwater discharge standards, the rainwater lift pump lifts the rainwater to the emergency water tank. As time goes by, the rainwater in the rainwater monitoring tank increases, the water quality gradually improves, and after meeting the rainwater discharge standards, the rainwater lift pump discharges the rainwater outside the plant. Step 3: After the rainfall ends, open the electric gate according to the water level of the accident water tank. The substandard rainwater will enter the accident water lifting tank from the accident water tank, and the accident water lifting pump will lift the substandard rainwater to the sewage treatment plant for treatment.

5. A drainage method for a combined rainwater monitoring tank and emergency water tank system according to claim 1 under accident conditions, characterized in that, The specific steps are as follows: Step 1: The floodwater is collected by the rainwater harvesting system, enters the rainwater monitoring tank, and is then pumped to the emergency water tank by the rainwater lift pump. Step 2: The accident water overflows into other accident water pools through the overflow hole. When the accident water pool reaches the alarm level, the control room alarms and the electric gate is opened remotely. The accident water enters the accident water lift pool, and the accident water lift pump lifts the accident water to the accident water diversion pool. Step 3: After the accident is over, the accident water will be manually tested. If the test fails, the relevant electric valves will be opened and the water will be pumped to the sewage treatment plant for treatment. If the test passes, the water will be returned to the rainwater monitoring tank through the manual gate and then discharged to the outside of the plant through the rainwater pump.

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