Closed circulation system for production of a polymer solution and improving operating efficiency of a gas drainage pump used in a coal mine

Abstract

Closed circulation system for production of and continuously preparing a polymer solution, including a pneumatic stirrer inside and a charging hopper at a top of a drag-reducing polymer solution tank, a gas drainage pump, a submersible pump, and a compressed air pipe connected to a pneumatic diaphragm pump. A liquid inlet of the pneumatic diaphragm pump is connected to a liquid outlet of the drag-reducing polymer solution tank, and the gas drainage pump liquid discharge pipe and a liquid outlet pipe of the diaphragm pump leads to a circulation water pool; a liquid outlet of the submersible pump is connected to a liquid inlet of the drag-reducing polymer solution tank and a liquid inlet of the gas drainage pump respectively through a three way pipe. The pneumatic stirrer and pneumatic diaphragm pump operate at speeds, so the drag-reducing polymer solution is mixed uniformly and fed into the circulation water pool.

Claims

1. A closed circulation system for improving an operating efficiency of a gas drainage pump, comprising a pneumatic diaphragm pump, a drag-reducing polymer solution tank, the gas drainage pump, a submersible pump, and a compressed air pipe, wherein a liquid inlet of the pneumatic diaphragm pump is connected to a liquid outlet of the drag-reducing polymer solution tank, and a liquid outlet pipe of the pneumatic diaphragm pump leads to a circulation water pool; a pneumatic stirrer is provided inside the drag-reducing polymer solution tank a charging hopper is provided at a top of the drag-reducing polymer solution tank; a liquid outlet of the submersible pump is connected to a liquid inlet of the drag-reducing polymer solution tank and a liquid inlet of the gas drainage pump respectively through a first three way pipe, and a liquid discharge pipe of the gas drainage pump is connected to the circulation water pool; and the compressed air pipe is connected to the pneumatic diaphragm pump and the pneumatic stirrer respectively through a second three way pipe.

2. The closed circulation system for improving the operating efficiency of the gas drainage pump according to claim 1, wherein the liquid outlet of the drag-reducing polymer solution tank is provided with a steel wire mesh, and the steel wire mesh has a mesh count of 30 to 50.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The FIGURE is a schematic view of a closed circulation system for improving operating efficiency of a gas drainage pump in the present invention.

(2) In the drawing: 1. compressed air pipe; 2. pipeline diameter change; 3. transparent rubber hose I; 4. pneumatic rubber hose three way pipe; 5. transparent rubber hose II; 6. pressure-regulating valve I; 7. pneumatic stirrer; 8. charging hopper; 9. drag-reducing polymer solution tank; 10. connecting pipe; 11. transparent rubber hose III; 12. pressure-regulating valve II; 13. pneumatic diaphragm pump; 14. liquid outlet pipe of pneumatic diaphragm pump; 15. circulation water pool; 16. submersible pump; 17. liquid outlet pipe of submersible pump; 18. regulating valve I; 19. three way pipe; 20. regulating valve II; 21. gas drainage pump; 22. liquid discharge pipe of gas drainage pump; 23 a liquid outlet with a steel wire mesh 24 of the drag-reducing polymer solution tank.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(3) The present invention is further described below with reference to the drawing and embodiment.

(4) As shown in the drawing, the system mainly consists of a compressed air pipe 1, a pneumatic diaphragm pump 13, a drag-reducing polymer solution tank 9, a submersible pump 16, and a gas drainage pump 21. A liquid inlet of the pneumatic diaphragm pump 13 is connected to a liquid outlet 23 of the drag-reducing polymer solution tank through a connecting pipe 10, and a liquid outlet pipe 14 of the pneumatic diaphragm pump leads to a circulation water pool 15. The drag-reducing polymer solution tank 9 is provided with a pneumatic stirrer 7 internally, and a charging hopper 8 at the top. A liquid outlet pipe 17 of the submersible pump 16 is connected to a liquid inlet of the drag-reducing polymer solution tank and a liquid inlet of the gas drainage pump respectively through a three way pipe 19, and two outlets of the three way pipe are respectively provided with a regulating valve I 18 and a regulating valve II 20. A liquid discharge pipe 22 of the gas drainage pump is connected to the circulation water pool 15. The compressed air pipe 1 is sequentially connected to a pipeline diameter change 2, a transparent rubber hose I 3, and a pneumatic rubber hose three way pipe 4. One outlet of the pneumatic rubber hose three way pipe 4 is connected to the pneumatic stirrer 7 through a transparent rubber hose II 5 and a pressure-regulating valve I. The other outlet of the pneumatic rubber hose three way pipe 4 is connected to the pneumatic diaphragm pump 13 through a transparent rubber hose III 11 and a pressure-regulating valve II 12.

(5) Working principle: the pressure-regulating valve II 12 is closed, the pressure-regulating valve I 6 is opened, high-pressure air in the compressed air pipe 1 drives the pneumatic stirrer 7 to rotate at high speed, and meanwhile, a polymer drag reducer is added to the drag-reducing polymer solution tank 9 through the charging hopper 8. After the drag reducer is sufficiently dissolved, the pressure-regulating valve II 12 is opened, so that part of the high-pressure air in the compressed air pipe 1 drives the pneumatic diaphragm pump 13 to operate to discharge a dissolved drag-reducing polymer solution into the circulation water pool 15 through the connecting pipe 10 and the liquid outlet pipe 14 of the pneumatic diaphragm pump, and meanwhile, the regulating valve I 18 is opened, so that part of water in the liquid outlet pipe 17 of the submersible pump flows into the drag-reducing polymer solution tank 9. The relative opening between the pressure-regulating valve II 12 and the regulating valve I 18 is adjusted, so that the liquid level in the drag-reducing polymer solution tank 9 is kept balanced. In this process, quantitative charging is still continuously performed, so that the concentration of the solution in the drag-reducing polymer solution tank 9 is kept constant. The other part of water in the liquid outlet pipe 17 of the submersible pump is supplied to the gas drainage pump 21 through a pipeline, and the submersible pump 16 also has a function of stirring and mixing the drag-reducing solution uniformly the second time. The liquid discharge pipe 22 of the gas drainage pump feeds the liquid discharged from the pump to the circulation water pool. When the concentration of the polymer drag reducer in the circulation water pool reaches the optimal drag reduction concentration, charging is stopped, and at this time, the operating efficiency of the gas drainage pump can be greatly improved. In this way, the closed circulation of the working medium of the gas drainage pump is realized.