Search

CN-118978224-B - Energy conversion system for energy conservation

CN118978224BCN 118978224 BCN118978224 BCN 118978224BCN-118978224-B

Abstract

The invention provides an energy-saving energy conversion system, and relates to the technical field of power plant wastewater treatment. The conversion system comprises a reverse osmosis device, a pressure regulating device and a vacuum breaking valve, wherein the reverse osmosis device is used for concentrating desulfurization wastewater to generate produced water and first concentrated water, the pressure regulating device comprises a pair of regulating hydraulic cylinders, the inner cavity of each regulating hydraulic cylinder is slidably provided with a regulating piston, the area of a pressure receiving surface of each regulating piston positioned on one side of a first subchamber is smaller than that of a pressure receiving surface positioned on one side of a second subchamber, the regulating hydraulic cylinders are used for utilizing the first concentrated water to lift the pressure of the desulfurization wastewater, the rotating control valve is used for controlling the first concentrated water to enter the second subchamber or controlling the second concentrated water to be discharged from the second subchamber, and the vacuum breaking valve is used for sucking air to break vacuum in a drainage pipeline. The energy-saving energy conversion system provided by the invention solves the problem of energy waste caused by the fact that the first concentrated water generated in the desulfurization wastewater treatment process is discharged after being subjected to valve adjustment or flow-limiting orifice plate decompression in the prior art, and improves the energy utilization rate.

Inventors

  • LIANG CHAO
  • MA YUEHUA
  • FENG WENRUI
  • SU SHUANGQING

Assignees

  • 国能水务环保有限公司

Dates

Publication Date
20260512
Application Date
20240726

Claims (9)

  1. 1. An energy-saving energy conversion system connected to a raw water tank (1) for storing and transporting desulfurization wastewater, characterized by comprising: The reverse osmosis device (2) is used for concentrating the desulfurization wastewater output by the raw water tank (1) to generate produced water and first concentrated water; The pressure regulating device (3) comprises a pair of regulating hydraulic cylinders (31), wherein an inner cavity of each regulating hydraulic cylinder (31) is slidably provided with a regulating piston (32), the inner cavity of each regulating hydraulic cylinder (31) is divided into a first subchamber (310) and a second subchamber (311) by the regulating piston (32), the area of a pressure receiving surface of one side of each regulating piston (32) positioned at the first subchamber (310) is smaller than the area of a pressure receiving surface of one side of each second subchamber (311), the first subchamber (310) of each regulating hydraulic cylinder (31) is connected with a water outlet of a raw water pond (1) and a water inlet of a reverse osmosis device (2), the second subchamber (311) is connected with a first concentrated water outlet of the reverse osmosis device (2) through a rotary control valve (4), the first concentrated water entering the second subchamber (311) of the regulating hydraulic cylinder (31) is used for lifting the pressure of desulfurization wastewater entering the corresponding first subchamber (310), the desulfurization wastewater enters the reverse osmosis device (2) after the pressure is lifted, the first concentrated wastewater is discharged into the reverse osmosis device (2), the first concentrated water after the pressure is released is converted into the second concentrated water through the rotary control valve (321), and the first concentrated water is discharged from the reverse osmosis device (32) through the rotary control valve (3), and the first concentrated water outlet of the desulfurization device is discharged from the reverse osmosis device is separated by the reverse osmosis device through the reverse osmosis device; The sliding part (321) is arranged in the inner cavity of the adjusting hydraulic cylinder (31) in a sliding way so as to divide the inner cavity of the adjusting hydraulic cylinder (31) into a first subchamber (310) and a second subchamber (311); One end of the guide rod part (322) is fixed with a pressure receiving surface of the sliding part (321) at one side of the first subchamber (310), and the other end is exposed outside the first subchamber (310); The rotary control valve (4) is used for controlling the first concentrated water discharged by the reverse osmosis device (2) to enter a second subchamber (311) of the regulating hydraulic cylinder (31) or controlling the second subchamber (311) of the second concentrated water self-regulating hydraulic cylinder (31) to be discharged, and the rotary control valve (4) comprises: The valve body (41) is provided with a valve cavity, and a first water inlet hole (410), a first water outlet hole (411), a second water inlet hole (412), a second water outlet hole (413) and a middle water inlet hole (414) are formed in the wall of the valve cavity; the valve comprises a valve core (42), a first water channel (421), a third water channel (423), a pair of second water channels (422) and a pair of fourth water channels (424), wherein the valve core (42) is rotatably arranged in the valve cavity, the rotation angle of the valve core (42) in the valve cavity is adjusted, the first water inlet hole (410) and the first water outlet hole (411) can be controlled to be connected or disconnected through the first water channel (421), the first water inlet hole (410) and the middle water inlet hole (414) are connected or disconnected through the corresponding second water channel (422), the second water inlet hole (412) and the second water outlet hole (413) are connected or disconnected through the third water channel (423), and the second water inlet hole (412) and the middle water inlet hole (414) are connected or disconnected through the corresponding fourth water channel (424); Wherein, the overflow ports at two ends of the first water channel (421), the overflow ports at two ends of the third water channel (423), the overflow ports at one end of the second water channel (422) towards the first water supply hole (410) and the overflow ports at one end of the fourth water channel (424) towards the second water supply hole (412) are all provided with buffer grooves (47), and vibration caused by flow change when liquid flows through the overflow ports of the first water channel (421), the second water channel (422), the third water channel (423) and the fourth water channel (424) can be relieved through the corresponding buffer grooves (47), wherein the buffer grooves (47) are arc-shaped grooves; a control valve driver (48) for driving the valve spool (42) to rotate within the valve chamber; and the vacuum breaking assembly (5) is connected with the water outlet of the rotary control valve (4) through a drainage pipeline and is used for sucking air to break the vacuum state in the drainage pipeline.
  2. 2. The energy conversion system for saving energy according to claim 1, wherein the pressure regulating device (3) further comprises a pair of water inlet check valves (33) and a pair of water outlet check valves (34); Each adjusting hydraulic cylinder (31) is provided with a first water gap (312) and a second water gap (313), and a water inlet one-way valve (33) and a water outlet one-way valve (34) are arranged at the first water gap (312); The first subchamber (310) of each adjusting hydraulic cylinder (31) is connected with the raw water pool (1) through a water inlet one-way valve (33), and the desulfurization wastewater output by the raw water pool (1) enters the first subchamber (310) of the corresponding adjusting hydraulic cylinder (31) through the water inlet one-way valve (33) and the corresponding first water gap (312); the first subchamber (310) of each adjusting hydraulic cylinder (31) is connected with the water inlet of the reverse osmosis device (2) through a water outlet one-way valve (34), and the first desulfurization wastewater enters the reverse osmosis device (2) through the first subchamber (310) of the adjusting hydraulic cylinder (31), the corresponding first water gap (312) and the corresponding water outlet one-way valve (34); The second water gap (313) of each adjusting hydraulic cylinder (31) is connected with the first concentrated water outlet of the reverse osmosis device (2) through a rotary control valve (4), the first concentrated water enters the second subchamber (311) of the corresponding adjusting hydraulic cylinder (31) through the rotary control valve (4) and the second water gap (313), and the second concentrated water is discharged after passing through the second subchamber (311) and the rotary control valve (4).
  3. 3. The energy-saving energy conversion system according to claim 1, wherein a pair of partition plates (415) are arranged in the valve cavity of the valve body (41), the valve cavity is divided into a first valve cavity (43), a second valve cavity (44) and an intermediate valve cavity (45) between the first valve cavity (43) and the second valve cavity (44) by the pair of partition plates (415), each partition plate (415) is provided with a through hole (416), the first valve cavity (43) and the second valve cavity (44) are respectively communicated with the intermediate valve cavity (45) through the corresponding through holes (416), the first water feeding hole (410) and the first water discharging hole (411) are formed in the cavity wall of the first valve cavity (43), the second water feeding hole (412) and the second water discharging hole (413) are formed in the cavity wall of the second valve cavity (44), and the intermediate water feeding hole (414) is formed in the cavity wall of the intermediate valve cavity (45).
  4. 4. The energy conversion system for energy conservation according to claim 3, characterized in that the spool (42) includes a connecting shaft (425) and a cylindrical first valve core (426) and a second valve core (427), the first valve core (426) is rotatably disposed in the first valve chamber (43), the second valve core (427) is rotatably disposed in the second valve chamber (44), the connecting shaft (425) is positioned in the intermediate valve chamber (45) and fixed to the first valve core (426) and the second valve core (427), the first water passage (421) and a pair of second water passages (422) are disposed on the first valve core (426), the third water passage (423) and a pair of fourth water passages (424) are disposed on the second valve core (427), and the spool (42) is adjusted to rotate so that the first water supply hole (410) and the intermediate water passage (414) are connected to the corresponding second valve chamber (422), the corresponding intermediate valve chamber (416) and the second water passage (416) are disconnected from the corresponding intermediate valve chamber (45), or the intermediate water passage (416) is disconnected from the corresponding through the second valve chamber (416) and the intermediate water passage (45).
  5. 5. The energy conversion system for saving energy according to claim 4, wherein the first water passage (421) is provided along a radial direction of the first valve core (426), and when the first water supply hole (410) and the first water discharge hole (411) are communicated, the water passing ports at both ends of the first water passage (421) are respectively communicated with the first water supply hole (410) and the first water discharge hole (411).
  6. 6. The energy conversion system for energy conservation of claim 5 wherein each second waterway (422) includes a second radial waterway segment (4221) and a second axial waterway segment (4222) in communication with the second radial waterway segment (4221); the second radial water channel section (4221) is arranged along the radial direction of the first valve core (426), the second axial water channel section (4222) is arranged along the axial direction of the first valve core (426), the water passing port of the second water channel (422) at one end of the second radial water channel section (4221) is a second radial water port, and the water passing port of the second water channel (422) at one end of the second axial water channel section (4222) is a second axial water port; When the first water inlet (410) is communicated with the middle water inlet (414), the second radial water gap of the second water channel (422) is communicated with the first water inlet (410), and the second radial water gap of the second water channel (422) is communicated with the corresponding through hole (416).
  7. 7. The energy conversion system for saving energy according to claim 4, wherein the third water passage (423) is provided along a radial direction of the second valve core (427), and when the second water supply hole (412) and the second water discharge hole (413) are communicated, the water passing ports at both ends of the third water passage (423) are respectively communicated with the second water supply hole (412) and the second water discharge hole (413).
  8. 8. The energy conversion system for energy conservation according to claim 7 wherein each fourth waterway (424) includes a fourth radial waterway segment (4241) and a fourth axial waterway segment (4242) in communication with the fourth radial waterway segment (4241); the fourth radial water channel section (4241) is arranged along the radial direction of the second valve core (427), the fourth axial water channel section (4242) is arranged along the axial direction of the second valve core (427), the water passing port of the fourth water channel (424) at one end of the fourth radial water channel section (4241) is a fourth radial water port, and the water passing port of the fourth water channel (424) at one end of the fourth axial water channel section (4242) is a fourth axial water port; When the second water feeding hole (412) is communicated with the middle water feeding hole (414), a fourth radial water gap of the fourth water channel (424) is communicated with the second water feeding hole (412), and a fourth axial water gap of the fourth water channel (424) is communicated with the corresponding through hole (416).
  9. 9. The energy conversion system for saving energy according to claim 8, wherein the buffer groove (47) is opened at the overflow port at both ends of the first water passage (421) and at the second radial water port of each second water passage (422) in the circumferential direction of the first valve core (426), and is opened at the overflow port at both ends of the third water passage (423) and at the fourth radial water port of each fourth water passage (424) in the circumferential direction of the second valve core (427).

Description

Energy conversion system for energy conservation Technical Field The invention relates to the technical field of power plant wastewater treatment, in particular to an energy conversion system for energy conservation. Background At present, the standard requirements for wastewater discharge are very strict, and the water environment protection is raised to the national strategy level. As for the power plant, the water is used as water and water drainage households, the water accounts for 20% of the total industrial water, and from a plurality of angles, the method has the advantages of cascade utilization, concentration reduction and water conservation, and is significant for realizing zero emission of desulfurization wastewater in the power plant. At present, in the field of desulfurization wastewater zero emission treatment, a membrane method is adopted for concentration and decrement, which is a main technological means. The TDS of desulfurization wastewater is usually about 50000ppm, the TDS of the concentrated water can reach 100000ppm after the concentration by a multi-stage reverse osmosis membrane, and then the concentrated water is sent to a crystallization evaporation drying treatment process to finally form the crystallization salt solid. In the current desulfurization wastewater treatment process, desulfurization wastewater incoming water is boosted to enter a high-pressure pump by adopting 100% of water, then continuously boosted by the high-pressure pump, enters a reverse osmosis system, and is partially concentrated into high-pressure concentrated water with high TDS through the concentration and separation effects of a reverse osmosis membrane. Because the osmotic pressure of the high TDS desulfurization wastewater is overcome, in a reverse osmosis membrane system, the desulfurization wastewater needs high water inlet pressure (50 bar-120 bar), the pressure of the high TDS concentrated water is often reduced by 1-2 bar after reverse osmosis concentration, then the high-pressure concentrated water of the reverse osmosis system is usually decompressed by adopting a valve adjusting or a current limiting orifice plate, the high-pressure concentrated water is usually decompressed to be within 10bar and becomes low-pressure concentrated water, the decompressed low-pressure concentrated water is discharged into a crystallization evaporation drying treatment process, and thus the energy of the concentrated water is not effectively utilized, and the energy is wasted. Therefore, a system is needed to solve the above-mentioned problems. Disclosure of Invention The embodiment of the invention aims to provide an energy-saving energy conversion system which is used for solving the problem of energy waste caused by the fact that first concentrated water generated in the process of treating desulfurization wastewater is discharged after being subjected to valve adjustment or reduced pressure by a flow limiting orifice plate in the prior art. In order to achieve the above object, the present invention provides an energy-saving energy conversion system connected to a raw water tank storing and transporting desulfurization wastewater, the energy-saving energy conversion system comprising: The reverse osmosis device is connected with the raw water pond and used for concentrating desulfurization wastewater output by the raw water pond to generate produced water and first concentrated water; The pressure regulating device comprises a pair of regulating hydraulic cylinders, wherein the inner cavity of each regulating hydraulic cylinder is slidably provided with a regulating piston, the inner cavity of each regulating hydraulic cylinder is divided into a first subchamber and a second subchamber by the regulating piston, the area of a pressure receiving surface of one side of each regulating piston positioned on the first subchamber is smaller than that of a pressure receiving surface of one side of each regulating piston positioned on the second subchamber; the rotary control valve is used for controlling the first concentrated water discharged by the reverse osmosis device to enter a second subchamber of the regulating hydraulic cylinder or controlling the second concentrated water to be discharged from the second subchamber of the self-regulating hydraulic cylinder; And the vacuum breaking assembly is connected with the water outlet of the rotary control valve through a drainage pipeline and is used for sucking air to break the vacuum state in the drainage pipeline. Specifically, the adjusting piston comprises a sliding part and a guide rod part; the sliding part is arranged in the inner cavity of the adjusting hydraulic cylinder in a sliding way so as to divide the inner cavity of the adjusting hydraulic cylinder into a first subchamber and a second subchamber; one end of the guide rod part is fixed with the pressed surface of the sliding part, which is positioned at one side of the first subchamber, and the othe