Circulating device for circulating water from floating roof water tank water taking pump to water tank
By setting up a water-draining drainage pipeline and a three-way interface at the bottom of the floating roof water tank, the flow of the pump circulation pipeline is solved, and the problems of medium heating and pump damage caused by the inability to be installed on the upper part of the water tank are achieved, and the pump is circulated for a long time and Small flow water supply enhances the structural strength of the water tank.
Patent Information
- Application Number
- CN202411515451.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-01-03
AI Technical Summary
In a floating roof water tank, the pump circulation pipeline outlet cannot be installed on the upper part of the water tank, resulting in the increase in the medium temperature during small flow operation, which may lead to cavitation and pump damage, and the inability to circulate for a long time or conduct small flow water supply or performance tests.
By setting up a drainage drainage pipeline at the bottom of the water tank, and passing the pump circulation pipeline into the water tank through this pipeline, adding a three-way interface, setting up an electric valve and a throttling orifice plate, it is divided into two branches to control the flow, ensuring that the pump can be fired for a long time Circulate and perform small flow water supply.
The number of water tank openings is reduced, the structural strength is enhanced, and the pump can be circulated for a long time and water supply is supplied in small flow, which avoids frequent start and stops, ensuring the continuous operation of the pump.
Smart Images
Figure CN119243827A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of operation control of a seawater desalination system, and in particular relates to a circulation device for circulating water from a floating top water tank to a water tank through a water pump. Background Art
[0002] The main function of the floating roof in a floating roof water tank is to isolate the air, prevent the medium in the tank from being oxidized, absorb carbon dioxide, pollute, reduce volatility, etc. The water tank supplies water to the pump from the bottom of the lower tank to ensure the net positive suction pressure head of the pump. If the pump has a circulation pipeline, the circulation pipeline inlet tank is generally at the top of the water tank. For a floating roof water tank, the pump circulation pipeline outlet cannot be installed on the top of the water tank. If the circulation pipeline outlet is connected to the pump inlet pipeline, that is, the pump circulates to the pump inlet pipeline, then when the pump is running at a low flow rate, it is necessary to circulate to ensure the minimum flow rate of the pump. The medium is constantly circulating at the pump inlet and outlet, and the pump kinetic energy and pressure energy are gradually converted into medium thermal energy. The medium temperature continues to rise, and long operation time will cause pump cavitation and even medium boiling. Therefore, the pump cannot circulate for a long time or supply water at a low flow rate or perform pump performance tests. Summary of the invention
[0003] The recirculation pipeline of the water pump from the floating roof water tank cannot circulate to the water tank. The medium in the circulating pipeline is continuously heated when circulating at the pump inlet, causing cavitation and even pump damage, resulting in the water pump being unable to circulate for a long time or supplying water at a small flow rate.
[0004] In order to solve the above problems, the purpose of the present invention is to provide a circulation device that takes water from a floating roof water tank and pumps it to the water tank, adds a tee to the drain discharge pipeline at the bottom of the water tank, and the pump circulation pipeline enters the water tank through the drain pipeline at the bottom of the water tank, thereby reducing the number of holes in the water tank, enhancing the structural strength of the water tank, ensuring that the pump can circulate for a long time, conducting pump performance tests and maintaining water supply under small flow conditions.
[0005] In order to achieve the above object, the technical solution adopted by the present invention is:
[0006] A circulation device for taking water from a floating roof water tank and pumping it to a water tank, wherein water tank A and water tank B supply water to pump A and pump B respectively, and a circulation pipeline is arranged on the outlet headers of pump A and pump B, and an electric valve and a throttling orifice plate are arranged on the circulation pipeline; the circulation pipeline is divided into two branches, one branch is connected to the tee between water tank A and the water tank A steam trap, and the other branch is connected to the tee between water tank B and the water tank B steam trap, and a water tank A isolation valve and a water tank B isolation valve are arranged on the two branches of the circulation pipeline respectively.
[0007] Pump outlet pipeline mixers are provided at the outlets of pump A and pump B.
[0008] The selection of the throttling orifice plate should ensure that the minimum operating flow of pumps A and B is met along the circulation pipeline when there is no flow at the outlet of pumps A and B.
[0009] When the outlet flow of pump A and pump B is less than 250m 3 / h, the electric valve will open automatically. When the outlet flow of pump A and pump B is greater than 350m 3 / h, close the electric valve.
[0010] The value selected for the automatic opening of the electric valve cannot be less than the minimum flow rate of pump A and pump B.
[0011] The selection of the closing flow rate of the electric valve ensures that the circulation pipeline flow rate is 220m 3 / h, the outlet flow of pump A and pump B is 350m 3 / h, the total flow of pump A and pump B is 570m 3 / h, which is less than the overload flow of pump A and pump B by 700m 3 / h, set 100m 3 / h hysteresis to avoid frequent switching of the electric valve.
[0012] The beneficial effects achieved by the present invention are:
[0013] The pump circulation pipeline of the present invention enters the water tank through the drain pipeline at the bottom of the water tank, thereby reducing the number of openings in the water tank and enhancing the structural strength of the water tank; performing pump performance tests and maintaining water supply under small flow conditions; the present invention ensures that the pump can circulate for a long time and perform pump performance tests; the present invention can ensure that the pump can continuously supply water at a small flow rate; the present invention can ensure that when the pump continuously supplies water, the pump can continue to operate when the working conditions suddenly change, thereby avoiding frequent starts and stops. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 A schematic diagram of a circulation device for pumping water from a floating roof water tank to a water tank;
[0015] In the figure: 1. Water tank A; 2. Water tank B; 3. Pump A; 4. Pump B; 5. Pump outlet pipe mixer; 6. Electric valve; 7. Throttle orifice plate; 8. Water tank A drain valve; 9. Water tank A isolation valve; 10. Water tank B drain valve; 11. Water tank B isolation valve. DETAILED DESCRIPTION
[0016] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.
[0017] A circulation device for pumping water from a floating top water tank to a water tank. Water tank A1 and water tank B2 supply water to pump A3 and pump B4 respectively. After passing through the pump, the water is supplied to the user from the outlet pipeline. A circulation pipeline device is arranged on the pump outlet manifold. The circulation pipeline device is sequentially provided with an electric valve 6 and a throttling orifice plate 7. The circulation pipeline is divided into two branches, which are respectively connected to the tee between the water tank A1 and the water tank A steam trap 8 and the tee between the water tank B2 and the water tank B steam trap 10. The circulating water can enter the water tank along the circulation pipeline device. The water tank A isolation valve 9 and the water tank B isolation valve 11 are respectively arranged on the two branches of the circulation pipeline.
[0018] A circulation pipeline is set at the outlet header of pump A3 and pump B4. The circulation pipeline is divided into two branches before entering water tank A1 and water tank B2, which are respectively connected to the three-way interface between the water tank and the steam trap; an electric valve 6 and a throttling orifice plate 7 are added to the circulation pipeline main pipe. The selection of the throttling orifice plate 7 should ensure that the minimum operating flow of the pump can be met along the circulation pipeline when the water pump outlet is running without flow, such as the minimum required flow of the water pump of the energy station of Tianwan seawater desalination project is 210m 3 / h, the throttling orifice plate 7 selects a flow capacity of 220m 3 / h; an isolation valve is set on each branch of the water inlet tank, namely, isolation valve 9 of water tank A and isolation valve 11 of water tank B. During normal operation, the isolation valve of the circulating pipeline water inlet tank is in the open state and the drain valve is in the closed state. If it is necessary to drain water from a water tank, the corresponding water tank circulating pipeline water inlet manual valve needs to be closed and the drain valve needs to be opened; if the circulating water needs to enter a water tank, the isolation valve of the water tank is opened and the isolation valve of the other water tank is closed.
[0019] When the pump outlet flow is less than 250m 3 / h, the electric valve 6 will be opened automatically. When the pump outlet flow rate is greater than 350m 3 / h, close the electric valve 6, and automatically open the electric valve 6. The value selection basis should not be less than the minimum flow rate of the pump. For example, the minimum flow rate of the desalted water supply pump of the energy station of the Tianwan seawater desalination project is required to be 210m 3 / h, so the pump outlet flow rate is set to less than 250m 3 / h, the electric valve 6 is automatically opened; the flow rate of the electric valve 6 closing valve is selected to ensure that the flow rate of the circulation valve pipeline is about 220m 3 / h, the pump outlet flow is 350m 3 / h, the total pump flow is 570m 3 / h is less than the pump overload flow rate of 700m 3 / h, set 100m 3 / h hysteresis can avoid frequent switching of the electric valve 6.
[0020] The present invention provides a method for a pump circulation pipeline to enter a water tank through a three-way interface between the bottom of a floating roof water tank and a steam trap, so that a pump supplying water to a floating roof water tank can circulate, reduce the number of holes in the water tank, and enhance the structural strength of the water tank. It ensures that the pump can circulate for a long time, conduct pump performance tests, and maintain water supply under low flow conditions. It can also ensure that when the pump continuously supplies water, the pump can continue to operate when the working condition suddenly changes, avoiding frequent start and stop.
Claims
1. A circulating device for pumping water from a floating roof water tank to a water tank, characterized in that: Water tank A and water tank B supply water to pump A and pump B respectively. A circulation pipeline is set on the outlet headers of pump A and pump B. An electric valve and a throttling orifice plate are arranged on the circulation pipeline. The circulation pipeline is divided into two branches. One branch is connected to the tee pipe between water tank A and the water tank A steam trap, and the other branch is connected to the tee pipe between water tank B and the water tank B steam trap. A water tank A isolation valve and a water tank B isolation valve are arranged on the two branches of the circulation pipeline respectively.
2. The circulating device for pumping water from a floating roof water tank to a water tank according to claim 1, characterized in that: Pump outlet pipeline mixers are provided at the outlets of pump A and pump B.
3. The circulating device for pumping water from a floating roof water tank to a water tank according to claim 1, characterized in that: The throttling orifice should be selected to ensure that the minimum operating flow of pumps A and B is met along the circulation pipeline when there is no flow at the outlet of pumps A and B.
4. The circulating device for pumping water from a floating roof water tank to a water tank according to claim 1, characterized in that: When the outlet flow of pump A and pump B is less than 250m 3 / h, the electric valve will open automatically. When the outlet flow of pump A and pump B is greater than 350m 3 / h, close the electric valve.
5. The circulating device for pumping water from a floating roof water tank to a water tank according to claim 4, characterized in that: The value selected for the automatic opening of the electric valve cannot be less than the minimum flow rate of pump A and pump B.
6. The circulating device for pumping water from a floating roof water tank to a water tank according to claim 4, characterized in that: The selection of the closing flow rate of the electric valve ensures that the circulation pipeline flow rate is 220m 3 / h, the outlet flow of pump A and pump B is 350m 3 / h, the total flow of pump A and pump B is 570m 3 / h, which is less than the overload flow of pump A and pump B by 700m 3 / h, set 100m 3 / h hysteresis to avoid frequent switching of the electric valve.