CN1524807A - Advanced treatment method for urban middle water as industrial recirculated cooling water - Google Patents
Advanced treatment method for urban middle water as industrial recirculated cooling water Download PDFInfo
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Abstract
The invention discloses a deep processing method of urban recycled water by using it as industrial cycling cooling water comprising the steps of, the urban recycled water being collected and entering the recycled water pool, then entering pressure type mixer, entering into clarification tank, liming by wet method for softening, condensation, settlement and automatic de-sludging, the output water flowing into the circular double chamber filter, then entering clean water tank through pressure type mixer, the clean water being pumped to the cycling water pump discharge pressure tube after the compensator to be used for re-circulated cooling water system.
Description
(I) technical field
The invention relates to a water treatment method, in particular to an advanced treatment method for urban reclaimed water serving as industrial circulating cooling water. It is especially suitable for the supplementary water treatment of industrial circulating cooling water in the industrial departments of electric power, petrifaction, metallurgy and the like.
(II) background of the invention
The research of China on the reuse of the discharged water of the urban sewage treatment plant is listed as a national scientific research topic as early as 1958, the research of sewage irrigation in the 60 s reaches a certain level, and the research of sewage recovery for industry and civilian use is carried out in succession in water-deficient cities such as Qingdao, Dalian, Taiyuan, Tianjin, Xian and the like in the early 80 s and achieves a certain result, but the successful application examples in the industrial cooling water are few, and only individual power plants adopt the advanced treatment of the urban reclaimed water as the make-up water of the cooling water of the power plants.
At present, the existing urban reclaimed water advanced treatment generally adopts the following method: city reclaimed water is sent to a reclaimed water tank, is sent to a clarification tank by a lift pump through a pressure type mixer, and automatically flows to a square filter tank from the effluent of the clarification tank, the effluent of the filter tank enters a clear water tank through the pressure type mixer, and water in the clear water tank is sent to a water tank at a suction inlet of a circulating water pump by the clear water pump and then enters a circulating water cooling system (the process flow is shown in figure 1).
However, the method for advanced treatment of urban reclaimed water can only make the concentration ratio of an industrial circulating cooling water system reach 2.5 times to the maximum, so that the reclaimed water after advanced treatment with high investment is not fully utilized.
The main reasons are as follows: the urban reclaimed water advanced treatment system can not effectively remove ammonia nitrogen. Because more than 90% of nitrogen exists in the form of ammonia in urban reclaimed water, when the ammonia is used as industrial circulating cooling water, the ammonia has extremely strong corrosivity on condenser pipes, particularly copper pipes; the ammonia nitrogen can promote the propagation and growth of microorganisms in the circulating water system, and biological scale is formed to influence the heat transfer effect of the condenser water pipe; in addition, if the ammonia nitrogen is excessive and nitrifies in the circulating cooling water, a large amount of alkalinity is consumed, so that the pH value of the circulating cooling water system is reduced, and the pipe material and the concrete member of the condenser are corroded. Therefore, in the utilization of reclaimed water, how to effectively remove ammonia nitrogen is one of the key measures for improving the concentration ratio of the industrial circulating cooling water system.
At present, the method for removing ammonia nitrogen in water mainly comprises the following steps:
(1) air blast stripping method: the method increases the pH of water to 10.8-11.5, and utilizes a large amount of waterThe ammonia nitrogen removal rate of the air stripping water can reach 98 percent. However, this method is not easy to implement because the solubility of ammonia in water increases and the stripping rate of ammonia decreases as the water temperature decreases. Because the amount of the circulating cooling water for supplementing water is large, the effect that the ammonia nitrogen removal rate is 98 percent cannot be realized without heating conditions. In addition, 3000m is needed for blowing off the ammonia in one cubic water3-6000m3Air, in low temperature seasons, blowing off ammonia with large amounts of cold air is impractical.
(2) Breakpoint chlorination (chlorination points are provided in the pressure mixer 3 and the pressure mixer 6, respectively): since ammonia reacts very readily with hypochlorous acid after chlorination, it is generally present mainly in the following form:
it has been reported in the experiments that when the molar ratio of chlorine to ammonia reaches 1.5: 1, substantially all of the oxidizing chlorine is reduced and all of the ammonia is oxidized, known as the breakpoint. However, in practical wastewater testing, the chlorine required to reach the break point was much greater than the experimental value, typically 12: 1. Because the chlorine adding amount is too large, at present, no adopter is available in the reclaimed water advanced treatment system.
In the existing urban reclaimed water advanced treatment method, under the condition that ammonia nitrogen cannot be effectively removed, the advanced treated water is added into a return ditch or a circulating water pumping well of an industrial circulating cooling water system, and a large amount of ammonia nitrogen is brought in to be nitrified in the circulating water system due to low concentration rate and large water replenishing amount of circulating water, so that a large amount of alkalinity is consumed, the pH value of the industrial circulating cooling water system is reduced, and concrete and condenser pipes are seriously corroded.
In addition, the existing urban advanced water treatment method has the following defects:
slime, organic impurities, colloidal impurities and bacteria and algae impurities in the circulating cooling water are easy to cause dirt and corrosion in a condenser pipe. Because of the instability and the variability of the sewage quality and the high pollution of low turbidity, a plurality of uncertain factors are brought to the reclaimed water advanced treatment, so that the water quality of the circulating cooling water is relatively complex, and particularly, slime, organic impurities, colloid impurities and bacteria and algae impurities cause great threat to the safe and economic operation of a condenser pipe. At present, the content of the dirt in the circulating water is kept within an allowable range by adopting a sewage disposal method, and the concentration ratio of the circulating cooling water system can only be kept below 2.5.
The addition of lime milk in the clarification tank is measured by a positive displacement dry method, namely, the positive displacement feeder under a slaked lime storage tank is adjusted according to the flow of a water inlet flow meter of the clarification tank so as to control the addition of lime powder. The result of this is: the quality of the slaked lime and the quality of the reclaimed water can cause the pH value of the effluent of the clarification tank to be unstable, and the operation effect of the system is poor.
In the prior art, the sludge discharge of a clarification tank adopts a timing sludge discharge mode, and automatic control is not realized. The normal operation of the clarification tank is difficult to be ensured by the sludge discharge mode, and the sludge discharge amount of the clarification tank changes along with the change of water quantity and water quality, so that the sludge discharge time and the sludge discharge amount cannot be accurately controlled by the timed sludge discharge mode, and the effluent quality of the clarification tank is difficult to be ensured.
The square filter adopted in the prior art has poor backwashing effect. Operation practices prove that when the square filter is backwashed, the backwashing effect of the regions at the four corners is poor, the filter material is easy to scale, and the turbidity of the effluent is increased.
Disclosure of the invention
Aiming at the defects of the related treatment method in the urban reclaimed water advanced treatment system, the invention provides the advanced treatment method for the urban reclaimed water as industrial circulating cooling water, which has the characteristics of high automation degree, accurate regulation and control, low energy consumption and advanced process, and aims to achieve the purposes of ensuring stable system operation and ensuring safe and economic operation of a circulating cooling water system by the quality of discharged water. Realizes the process indexes of zero-cost deamination and denitrification and keeping low turbidity of the treated clear water all the time.
The invention relates to an advanced treatment method for urban reclaimed water as industrial circulating cooling water, which comprises the following steps:
urban reclaimed water enters a reclaimed water tank, then enters a pressure type mixer through a lift pump, coagulant is added into the pressure type mixer for coagulation, the urban reclaimed water enters a clarification tank through the pressure type mixer, coagulant aid and lime milk are added into the clarification tank for softening reaction, coagulation, clarification and sludge discharge, discharged water flows into a filter, the discharged water enters a clear water tank through the pressure type mixer after pH is adjusted to be neutral by acid, clear water in the clear water tank is added into a pressure pipe of a circulating water pump outlet through the clear water pump and enters and is used for a circulating cooling water system.
The mode of adding lime milk into the clarification tank adopts wet metering; the sludge discharge in the clarification tank adopts automatic sludge discharge; the effluent treated by the clarification tank automatically flows to a circular double-chamber filter for forced air and water washing, so that backwashing water distribution is uniform, and low turbidity of clear water is ensured; clear water in the clear water tank is pumped into a pressure pipe of a circulating water pump outlet behind the condenser through a clear water pump, then enters a cooling tower in a circulating cooling water system together with the circulating water for circulation and contacts with the atmosphere to complete ammonia nitrogen removal; the circulating cooling water system is provided with a circulating water bypass system, circulating water with the total circulating water amount of 0.2-1% can be led out according to water quality, enters a reclaimed water pool and is reprocessed along with collected reclaimed water.
The method for adding the lime milk in the wet metering manner comprises the following steps: lime powder in a lime hydrate storage tank is prepared into lime milk with the concentration of 5% in a lime milk preparation tank through a metering hopper, the lime milk is conveyed to a lime milk stirring tank at regular time through a lime milk conveying pump, the flow of the lime milk dosing pump is adjusted according to a pH meter of a second reaction zone, and the pH of effluent of a clarification tankis kept at 10.3-10.5.
The automatic sludge discharge method comprises the following steps: the concentration of the sludge in the sampling pipe is monitored at any time, and the three electric valves are respectively opened in time to discharge the sludge according to the measured concentration of the sludge, so that the concentration of the sludge in the clarification tank is maintained at a set level, and the lowest turbidity of the effluent of the clarification tank is kept.
The ammonia nitrogen removal is realized by fully aerating supplemented clear water in a cooling tower and fully nitrifying ammonia nitrogen brought in the clear water under the condition of circulating water with the pH value of more than or equal to 8 and the water temperature of more than or equal to 30 ℃.
The circulating water bypass system is a system which leads part of circulating water to flow into a reclaimed water pool by a circulating water return pipe on a circulating water pump outlet pressure pipe in front of a condenser according to water quality.
The advanced treatment method using the urban reclaimed water as the industrial circulating cooling water has the characteristics of high automation degree, accurate adjustment and control, low energy consumption and advanced process.
The outstanding effect and creativity brought by the method are mainly shown in the following steps:
after the automatic wet lime milk metering system is used, the influence of the change of the pH value of the conventional clarifying tank caused by the quality of the incoming water and the purity of slaked lime is overcome, and the pH value of the effluent of the clarifying tank is stable; the automatic sludge discharge system can keep the height of the slag layer in the clarification tank at the optimal height state, and overcomes the defects thatthe prior clarification tank discharges slag regularly, the fluctuation of the sludge layer is large, and the effluent turbidity of the clarification tank is influenced. In a word, after the two technologies are adopted, the effluent quality of the clarification tank is good, stable and reliable.
In the method, the effluent of the clarification tank flows to the circular double-chamber filter automatically, so that the existing square filter tank is replaced, the phenomenon that filter materials are agglomerated due to uneven backwashing water distribution of the square filter tank is effectively overcome, and the defects of large effluent quality fluctuation and large operation and maintenance workload of filter equipment are overcome; after the double-chamber filter is selected, the double-chamber filter is washed by forced gas-water combination, so that the backwashing effect is good, the low turbidity of clear water is ensured, and the double-chamber filter is a relatively independent double filtering layer, so that the occupied area is reduced by more than 50%.
The ammonia nitrogen removal from reclaimed water is a great problem, particularly for a system with large water volume. When the reclaimed water is used as the make-up water of a large-scale industrial cooling water system, the investment for independently constructing the ammonia nitrogen removal equipment is huge. By adopting the deamination and denitrification method, zero-cost deamination and denitrification are realized, the ammonia nitrogen content of a circulating cooling water system is ensured to be less than 1.0 mg/L, and considerable cost is saved.
In a large circulating cooling water system, due to dust pollution in evaporation concentration and air washing processes, particularly when the concentration ratio is about five times, suspended impurities and temporary hardness in circulating water can exceed an allowable control range, and the safe and economic operation of heat exchange equipment in the system is influenced. By adopting the circulating water bypass system, part of circulating water is returned and merged into the reclaimed water advanced treatment system again, on one hand, part of suspended matters in the circulating water can be removed, and simultaneously, the temporary hardness of the circulating water is also reduced; on the other hand, the heat exchanger can prevent slime concentration in the condenser from influencing the heat transfer effect and causing pipe corrosion, fully realizes and ensures the safe and economic operation of the heat exchange equipment of the circulating cooling water system, and has remarkable economic benefit and social environmental protection benefit.
(IV) description of the drawings
FIG. 1 is a process flow chart of the existing urban water advanced treatment method
Wherein, 1 middle water pool, 2 lift pumps, 3 pressure type mixers, 4 clarification tanks, 5 square filters, 6 pressure type mixers, 7 clean water tanks, 8 clean water pumps, 10 circulating water backwater ditches, 11 circulating water pump suction wells, 12 circulating water pumps, 13 condensers, 14 circulating water pump outlet pressure pipes, 15 cooling towers, 16 circulating water pools, 17 first reaction chambers, 18 second reaction chambers, 20 sludge collecting devices, 24 lime milk stirring tanks, 25 lime milk dosing pumps, 27 lime hydrate storage tanks, 28 star-shaped feeders and 29 orifice flow meters.
FIG. 2 is a process flow chart of the advanced treatment method of urban reclaimed water as industrial circulating cooling water related by the invention
Wherein: 1 middle water pool, 2 lift pump, 3 pressure type mixer, 4 clarifying pool, 6 pressure type mixer, 7 clear water tank, 8 clear water pump, 9 electric valve, 10 circulating water backwater ditch, 11 circulating water pump suction well, 12 circulating water pump, 13 condenser, 14 circulating water pump outlet pressure pipe, 15 cooling tower, 16 circulating water pool, 17 first reaction chamber, 18 second reaction chamber, 19 sampling pipe, 20 sludge collecting device, 21 sludge discharge control device, 22 sludge discharge collecting pool, 23pH meter, 24 lime milk stirring box, 25 lime milk dosing pump, 26 circulating water reflux pipe, 27 lime slaking storage box, 30 lime slaking doser, 31 lime milk delivery pump, 32 circular dual-type filter, 33 lime milk preparation box.
FIG. 3 is a schematic view of a circular dual chamber filter
Wherein: wherein: 40 cylinder, 41 filter material, 42 porous plate, 43 compressed air pipe, 44 inlet hole, 45 upper chamber inlet pipe, 46 lower chamber inlet pipe, 47 upper chamber outlet pipe, 48 lower chamber outlet pipe.
The present invention will be further described with reference to the following embodiments.
(V) detailed description of the preferred embodiments
Example 1:
the installed capacity of a power plant is designed to be a condensing unit of 2 x 600MW, and urban reclaimed water is adopted as circulating water make-up water. The indexes of the water quality and the water supplement amount are as follows:
temporary hardness: 8mmol/L
SS (suspended substance) 20mg/L
BOD520mg/L
COD 60mg/L
NH3-N 8mg/L
Total amount of circulating water: 130000m3/h
Concentration magnification was calculated as 5 times:
sewage discharge amount: 340m3/h
Wind blowing loss: 130m3/h
Evaporation loss: 1886m3/h
Total make-up water volume: 2356m3/h
The advanced treatment method of urban reclaimed water used as industrial circulating cooling water adopts a normal design position of a reclaimed water advanced treatment systemWater treatment quantity 2500m3Per hour, maximum treated water amount 3000m3And h, completely recovering the wastewater in the treatment process, arranging a centralized control room, and implementing full-automatic control on main equipment. The main process flow implemented is shown in fig. 2: the reclaimed water comes from a secondary treatment station of urban sewage, and enters two 1000m stations after entering the plant3The storage tank 1 is further provided with four lift pumps 2(1000 m)3/h，H＝25MH2O) supplying water to the system into the pressure mixer. Pressure mixer 3(1000 m)3H) three flocculating agent automatic dosing systems are arranged, polymeric iron can be automatically added into the pressure type mixer 3, and the polymeric iron is fully mixed with water and then enters clarification by utilizing a water flow stirring structure in the pressure type mixer 3And (4) a pool. A mechanical stirring accelerated clarification tank 4(1000 m)3And h) three automatic adding devices for adding coagulant aids (polyacrylamide) to the first reaction zone and an automatic adding system for measuring lime milk by a wet method. The lime milk adding system comprises: slaked lime storage tank 27(200 m)3Three lime powders) enter a lime milk preparation tank 33 through ametering hopper 30, lime milk with the concentration of 5% is prepared in the lime milk preparation tank 33, the lime milk is sent to a lime milk stirring tank 24 through a lime milk conveying pump 31 at regular time, and the flow rate of a lime milk dosing pump 25 is adjusted according to a pH meter 23 of a second reaction zone 18, so that the pH of effluent water of a clarification tank 4 is maintained at 10.3-10.5. The project is provided with three sets of lime milk preparation and addition systems. Full automatic control is implemented in the operation of depositing reservoir 4, and its bottom is equipped with automatic mud discharging device, monitors the mud sediment concentration in the sampling tube 19 at any time, in time opens three motorised valves 9 according to the mud sediment concentration of surveying respectively and arranges mud, makes the mud sediment concentration in depositing reservoir 4 maintain at the settlement level, keeps depositing reservoir outlet water turbidity minimum. The effluent treated by the clarification tank 4 automatically flows to four circular double-chamber filters 32(1000 m)3And/h), performing forced gas water washing, and fully automatically controlling the operation of the double-chamber filter 32 to ensure uniform backwashing water distribution and low turbidity of clear water. Between the double chamber filter 32 and the clean water tank 7, a pressure mixer 6(3000 m) is provided3And h) one, and is provided with an automatic sulfuric acid adding system to the inlet of the pressure type mixer 6 so as to ensure that the pH value of the outlet water of the pressure type mixer 6 is adjusted to be neutral. Pressure mixer 6Two clean water tanks 7(500 m) are connected at the rear part3) The clean water in the clean water tank 7 passes through a clean water pump 8(1500 m)3/h，H＝25MH2O) is sent into a circulating water pump outlet pressure pipe 14 behind the condenser 13, then enters a cold water tower 15 in a circulating cooling water system together with the circulating water for circulation and contacts with the atmosphere to finish deamination and denitrification. The circulating cooling water system is provided with a circulating water bypass system, and circulating water 300-500m can be led out by a circulating water return pipe 26 on a circulating water pump outlet pressure pipe 14 in front of the condenser 13 according to the water quality3And the water enters the reclaimed water pool 1, returns to the reclaimed water advanced treatment system again, and is reprocessed along with reclaimed water to remove part of suspended matters in the circulating water, reduce the temporary hardness of the circulating water, and prevent slime concentration generated in the condenser from influencing the heat transfer effect and causing pipe corrosion.
The water quality after advanced treatment by the method has the following detection indexes:
SS ≤5mg/L
BOD5≤10mg/L
CODCr ≤30mg/L
NH3-N ≤6mg/L
temporary hardness is less than or equal to 1.8mmol/L
The reclaimed water advanced treatment system can ensure safe, continuous and stable operation, the quality of the discharged water can meet the water replenishing quality requirement of the circulating cooling water of the 600MW generator set, and the concentration ratio of the circulating water can be improved to 5 times. Calculated by 6000 hours of annual operation, the annual water saving is about 285 ten thousand m3At a water price of 2.0 yuan/m3The water cost is saved by 570 ten thousand yuan/year, and the annual saving is 280 ten thousand m3The fresh water is considered, and the social benefit and the economic benefit are considerable.
Claims (5)
1. An advanced treatment method for urban reclaimed water serving as industrial circulating cooling water comprises the following steps: urban reclaimed water gets into pond (1), get into pressure type blender (3) through elevator pump (2) again, it is coagulated to add the coagulant in pressure type blender (3), get into clarification tank (4) by pressure type blender (3), add coagulant aid and lime milk in the clarification tank, carry out softening reaction, coagulate, clarify, arrange mud, the play water flows into the filter, it is through pressure type blender (6) again to go out water, and get into clear water case (7) after reaching neutrality with sour pH, clear water in clear water case (7) adds in circulating water pump outlet pressure pipe (14) through clear water pump (8), get into and be used for recirculated cooling water system, its characterized in that: the lime milk is added into the clarification tank (4) by wet metering; the sludge discharge in the clarification tank (4) adopts automatic sludge discharge; the effluent treated by the clarification tank (4) automatically flows to a circular double-chamber filter (32) for forced air and water washing, so that backwashing water distribution is uniform, and low turbidity of clear water is ensured; clear water in the clear water tank (7) is sent into a circulating water pump outlet pressure pipe (14) behind the condenser (13) through a clear water pump (8), then enters a cold water tower (15) in the circulating cooling water system together with the circulating water for circulation and contacts with the atmosphere to complete deamination and denitrification; the circulating cooling water system is provided with a circulating water bypass system, circulating water with the total circulating water amount of 0.2-1% can be led out accordingto the water quality, enters the reclaimed water pool (1) and is reprocessed along with the reclaimed water.
2. The advanced treatment method of urban water as industrial circulating cooling water according to claim 1, characterized in that the method of wet metering lime milk is as follows: lime powder in a lime hydrate storage tank (27) is prepared into lime milk with the concentration of 5% in a lime milk preparation tank (33) through a metering hopper, the lime milk is periodically conveyed to a lime milk stirring tank (24) through a lime milk conveying pump (31), the flow of a lime milk dosing pump (25) is adjusted according to a pH meter (23) of a second reaction zone (18), and the pH value of effluent of a clarification tank (4) is maintained at 10.3-10.5.
3. The method for advanced treatment of urban water as industrial circulating cooling water according to claim 1, characterized in that the automatic sludge discharge method is: the concentration of the sludge in the sampling pipe (19) is monitored at any time, and the three electric valves (9) are respectively opened in time to discharge the sludge according to the measured concentration of the sludge, so that the concentration of the sludge in the clarification tank (4) is maintained at a set level, and the minimum turbidity of the effluent of the clarification tank is kept.
4. The advanced treatment method of urban reclaimed water as industrial circulating cooling water according to claim 1, characterized in that the ammonia nitrogen removal means that supplemented clean water is fully aerated in a cooling tower (15) and ammonia nitrogen brought in the clean water is fully nitrified under the condition of circulating water with pH value of more than or equal to 8 and water temperature of more than or equal to 30℃.
5. The method for advanced treatment of urban reclaimed water as industrial circulating cooling water according to claim 1, wherein the circulating water bypass system is a system which leads part of circulating water to flow into the reclaimed water pool (1) by a circulating water return pipe (26) on a circulating water pump outlet pressure pipe (14) before the condenser (13) according to the water quality.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100415338C (en) * | 2007-06-01 | 2008-09-03 | 华电水处理技术工程有限公司 | Method and equipment for purifying recirculated cooling water or town B-grade sewage |
| CN102452714A (en) * | 2010-10-21 | 2012-05-16 | 中国石油化工股份有限公司 | Treatment method for recycled water and application thereof |
| CN102701352A (en) * | 2012-06-21 | 2012-10-03 | 青岛理工大学 | Method for treating reclaimed water recycled for circulating cooling water of power plant |
| CN102795715A (en) * | 2012-08-15 | 2012-11-28 | 国核电力规划设计研究院 | Treatment system for thermal power plant circulating water blowdown water |
| CN104806419A (en) * | 2014-01-26 | 2015-07-29 | 宝山钢铁股份有限公司 | Self-powered circulating water side stream system and use method thereof |
| CN112320906A (en) * | 2020-05-29 | 2021-02-05 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Dynamic simulation operation device of mechanical accelerated clarification tank and test method thereof |
-
2003
- 2003-09-15 CN CN 03139046 patent/CN1216812C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100415338C (en) * | 2007-06-01 | 2008-09-03 | 华电水处理技术工程有限公司 | Method and equipment for purifying recirculated cooling water or town B-grade sewage |
| CN102452714A (en) * | 2010-10-21 | 2012-05-16 | 中国石油化工股份有限公司 | Treatment method for recycled water and application thereof |
| CN102452714B (en) * | 2010-10-21 | 2013-09-04 | 中国石油化工股份有限公司 | Treatment method for recycled water and application thereof |
| CN102701352A (en) * | 2012-06-21 | 2012-10-03 | 青岛理工大学 | Method for treating reclaimed water recycled for circulating cooling water of power plant |
| CN102701352B (en) * | 2012-06-21 | 2013-07-17 | 青岛理工大学 | Method for treating reclaimed water recycled for circulating cooling water of power plant |
| CN102795715A (en) * | 2012-08-15 | 2012-11-28 | 国核电力规划设计研究院 | Treatment system for thermal power plant circulating water blowdown water |
| CN104806419A (en) * | 2014-01-26 | 2015-07-29 | 宝山钢铁股份有限公司 | Self-powered circulating water side stream system and use method thereof |
| CN104806419B (en) * | 2014-01-26 | 2018-06-01 | 宝山钢铁股份有限公司 | A kind of self-powered circulating-water bypass water system and its application method |
| CN112320906A (en) * | 2020-05-29 | 2021-02-05 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Dynamic simulation operation device of mechanical accelerated clarification tank and test method thereof |
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