CN106091797A - Large Copacity circulating cooling water tower mends water discharge method and system - Google Patents
Large Copacity circulating cooling water tower mends water discharge method and system Download PDFInfo
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- CN106091797A CN106091797A CN201610453018.6A CN201610453018A CN106091797A CN 106091797 A CN106091797 A CN 106091797A CN 201610453018 A CN201610453018 A CN 201610453018A CN 106091797 A CN106091797 A CN 106091797A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
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- General Engineering & Computer Science (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The present invention relates to energy saving optimizing, disclose a kind of Large Copacity circulating cooling water tower and mend water discharge method and Large Copacity circulating cooling water tower make-up and discharge system, this benefit water discharge method includes: calculate the total evaporation Q of circulating cooling water tower；Total evaporation Q, correction factor ψ, top evaporation capacity E and local evaporation capacity C according to described circulating cooling water tower calculates the real-time rate of water make-up B and water tower real-time displacement M of circulating cooling water tower；Carry out moisturizing according to described real-time rate of water make-up B, carry out draining according to described water tower real-time displacement M.This circulating cooling water tower benefit water discharge method and circulating cooling water tower make-up and discharge system can draw the numerical value of real-time rate of water make-up and displacement, it is achieved the water level of Large Copacity secondary cycle cooling tower and the accurate control of concentration rate, thus reach purpose and the effect of water saving.
Description
Technical field
The present invention relates to energy saving optimizing, in particular it relates to water discharge method mended by Large Copacity circulating cooling water tower and Large Copacity follows
Ring cooling tower make-up and discharge system.
Background technology
Secondary cycle water tower cooling technology is widely used in industrial processes, provides for equipment cooling, steam condensation
Cooling medium.The water resource loss of water tower is relatively big simultaneously, and the most the evaporation loss of recoverable does not accounts for the overwhelming majority, the coldest
But water tower becomes the water consumption rich and influential family of industrial undertaking.As a example by thermal power plant, 600MW grade above unit secondary cycle water tower is used
The 85-90% of water yield Zhan Quan factory water consumption.
For ensureing equipment safe and stable operation, secondary cycle cooling tower need to keep water level within limits, simultaneously
Control the concentration rate (referring to the ratio of the salinity of recirculated water and the salinity of supplementary water) of recirculated water within acceptability limit.By
Relatively big in industrial circulating water cooling tower capacity, water tower level is relatively big, for a long time with regulation to the remote-effects of concentration rate
Benefit draining control method for the purpose of cooling tower water level and concentration rate is extensive.There is delayed and inaccuracy in regulation, causes not
Water resource waste with degree.
The adjustment technology of the water inlet of existing circulating water water tower and draining is due to the fact that the finest tune can not be realized
Joint, thus it is stable to realize recirculated water water tower level, the optimum water conservation state that concentration rate is stable.Circulation water tower evaporation loss
Being changed to be affected by external environment and turnover water temperature and do not fix, volume is difficult to more greatly accurately measure；Recirculated water water tower local evaporation
Lose and affected relatively greatly by external condition, actual motion is difficult to estimation and draws；The benefit row of cooling tower during variable working condition
Water can not realize whole-process automatic tracking adjustment.
Summary of the invention
It is an object of the invention to provide a kind of Large Copacity circulating cooling water tower benefit water discharge method and a kind of Large Copacity circulation is cold
But water tower make-up and discharge system, this Large Copacity circulating cooling water tower mends water discharge method and Large Copacity circulating cooling water tower make-up and discharge system
The numerical value of real-time rate of water make-up and displacement can be drawn, it is achieved the water level of secondary cycle cooling tower and the accurate control of concentration rate
System, thus reach purpose and the effect of water saving.
To achieve these goals, the present invention provides a kind of Large Copacity circulating cooling water tower to mend water discharge method, this benefit draining
Method includes: calculate the total evaporation Q of circulating cooling water tower；Total evaporation Q according to described circulating cooling water tower, correction factor
ψ, top evaporation capacity E and local evaporation capacity C calculate the real-time rate of water make-up B and water tower displacement M of circulating cooling water tower；According to described
Rate of water make-up B carries out moisturizing in real time, carries out draining according to described water tower displacement M.
The present invention also provides for a kind of Large Copacity using Large Copacity circulating cooling water tower mentioned above to mend water discharge method and follows
Ring cooling tower make-up and discharge system, this make-up and discharge system includes: automatic water supplement valve；Auto-drainage valve；Controller, with described
Automatic water supplement valve and described Auto-drainage valve connect, and are used for calculating water tower displacement M and real-time rate of water make-up B, according to institute
State the aperture of displacement M control Auto-drainage valve to control draining and described automatically according to described real-time rate of water make-up B control
The aperture of moisturizing valve is to control moisturizing.
By technique scheme, the Large Copacity circulating cooling water tower using the present invention to provide is mended water discharge method and mends draining
System, calculates total evaporation Q, top evaporation capacity E and the local evaporation capacity C of circulating cooling water tower, according to circulating cooling water tower
Total evaporation Q, top evaporation capacity E, local evaporation amount C and correction factor ψ calculate the real-time rate of water make-up B of circulating cooling water tower
With water tower displacement M, thus carry out moisturizing according to real-time rate of water make-up B, and carry out draining according to water tower displacement M.The present invention carries
The circulating cooling water tower benefit water discharge method of confession and make-up and discharge system can draw the numerical value of real-time rate of water make-up and displacement, it is achieved two
The water level of secondary circulating cooling water tower and the accurate control of concentration rate, thus reach purpose and the effect of water saving.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, with following tool
Body embodiment is used for explaining the present invention together, but is not intended that limitation of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart that water discharge method mended by the Large Copacity circulating cooling water tower that the present invention provides；
Fig. 2 is the structural representation of the Large Copacity circulating cooling water tower make-up and discharge system that the present invention provides.
Description of reference numerals
1 automatic water supplement valve 2 Auto-drainage valve
3 controllers.
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is described in detail.It should be appreciated that this place is retouched
The detailed description of the invention stated is merely to illustrate and explains the present invention, is not limited to the present invention.
Fig. 1 is the flow chart that water discharge method mended by the Large Copacity circulating cooling water tower that the present invention provides.As it is shown in figure 1, this
Water discharge method mended by a kind of Large Copacity circulating cooling water tower of bright offer, and this benefit water discharge method includes: calculate the total of circulating cooling water tower
Evaporation capacity Q；Total evaporation Q, correction factor ψ, top evaporation capacity E and local evaporation capacity C meter according to described circulating cooling water tower
Calculate the real-time rate of water make-up B and water tower displacement M of circulating cooling water tower；Moisturizing is carried out, according to described according to described real-time rate of water make-up B
Water tower displacement M carries out draining.
Recirculated water completes heat exchange and cooling procedure in tower, and cooling water directly contacts with air at Ta Nei, main heat exchange shape
Formula is cooling evaporation of water heat radiation, including heat transfer and mass transport process.In cyclic process, due to recirculated water meeting in cooling procedure
There are evaporation loss, wind and leakage loss, for keeping the water yield and the water quality balance of recirculated water, therefore there is the cooling tower water yield and put down
Weighing apparatus relation: cooling tower water yield variable quantity=circulating cooling make-up water amount-recirculated water total evaporation-water tower displacement.
The total evaporation Q of described circulating cooling water tower is drawn by below equation: Q=E+C, and wherein E is recirculated cooling water
Tower top evaporation capacity, C is circulating cooling water tower local evaporation amount.Described circulating cooling water tower top evaporation capacity E is by following public affairs
Formula draws:Wherein Δ t is the temperature difference cooling down water of cooling tower gateway, and L is circulating water flow.Described follow
Ring cooling tower local evaporation amount C is the 0.05-0.1% of circulating water flow L.
Local evaporation amount C is by caused on this body structure of cooling tower.When the pressure of cooling circulating water is less than identical bar
Evaporation of water pressure under part, cooling circulating water system has flicker and occurs, causes local evaporation phenomenon, and this evaporation capacity is the most only
For cooling circulating water amount less than 0.1%.When calculating local evaporation amount C, it is considered that local evaporation amount C accounts for all coolings and follows
The 0.05-0.1% of the ring water yield.Circulating water flow L is to measure the flow under the different water circulating pump method of operation by test and obtain
, known quantity is may be considered at this.And the difference that Δ t is cooling water outlet temperature and cooling water inlet temperature, and cool down water and go out
Mouth temperature and cooling water inlet temperature all can record.
Described real-time rate of water make-up B is drawn by below equation with water tower displacement M:With
And dB-dM=dH+dE+dC, wherein Q is the total evaporation of circulating cooling water tower, and ψ is correction factor, and K is that recirculated water concentrates again
Rate, dB is the differential of real-time rate of water make-up, and dM is the differential of water tower displacement, and dH is the differential of water tower level, and dE is top evaporation
The differential of amount, dC is the differential of local evaporation amount.
Recirculated water concentration rate K is typically with the chlorine ion concentration of the chlorine ion concentration of recirculated water in tower with the source water filling into tower
Ratio measurement.Residing for secondary cycle cooling tower, geographical position is different, and natural environment and climate condition is different, real-time rate of water make-up
Need the verification through on-the-spot actual tests and comparison, obtain correction factor through verification.Preferably, what the present invention provided is described
Correction factor ψ is 0.90-0.95, but this is not limited by the present invention.
In the middle of above-mentioned formula, Q is calculated above drawing, ψ is fixed value, and K draws, therefore for calculating test measurementIn formula, unknown quantity is real-time rate of water make-up B and water tower displacement M.For dB, dM, dE and dC,
Being respectively real-time rate of water make-up B, water tower displacement M, top evaporation capacity E and the differential of local evaporation capacity C, same unknown quantity is real-time
Rate of water make-up B and water tower displacement M.Real-time rate of water make-up B and water tower displacement M can be calculated by above-mentioned two formulas.
It practice, the concrete numerical value of recirculated water concentration rate K (condensed water rate ion concentration/former water chlorine ion concentration) is difficult to
Measure in real time, but condensed water electrical conductivity/former water conductivity KppCan measure in real time.Being found by measurement, chloride ion is dense
There is linear corresponding relation, as shown in table 1 in degree and electrical conductivity.Based on this point, it is possible to understand that K and KppThere is also linear relationship, because of
This is by measuring K value, with KppCorresponding relation, with obtain in real time correspondence K value.
Table 1 chlorine ion concentration, electrical conductivity, K and KppNumerical tabular
| Chlorine ion concentration (mg/L) | Electrical conductivity (S/cm) | K | Kpp |
| 48 | 788 | 1.20 | 1.24 |
| 58 | 983 | 1.35 | 1.55 |
| 65 | 1223 | 1.69 | 1.77 |
| 81 | 1395 | 1.96 | 2.08 |
| 94 | 1640 | 2.29 | 2.35 |
| 110 | 1849 | 2.92 | 2.98 |
| 140 | 2350 | 3.13 | 3.30 |
The present invention also provides for a kind of Large Copacity circulating cooling water tower make-up and discharge system, and this make-up and discharge system includes: automatically mend
Penstock 1；Auto-drainage valve 2；Controller 3, is connected with described automatic water supplement valve 1 and described Auto-drainage valve 2, is used for
Calculate water tower displacement M and real-time rate of water make-up B, control the aperture of Auto-drainage valve 2 to control row according to described displacement M
Water, and control the aperture of described automatic water supplement valve 1 to control moisturizing according to described real-time rate of water make-up B.
Controller 3 can utilize circulating cooling water tower mentioned above to mend water discharge method and calculate water tower displacement M with in real time
Rate of water make-up B, this calculating process is to calculate in real time, and draws water tower displacement M and real-time rate of water make-up B simultaneously, it is ensured that become delayed tune
Joint is for following the tracks of regulation, it is achieved a dynamic feed and bleed process.At the water tower displacement M calculated and real-time rate of water make-up B
Afterwards, according to the water tower displacement M calculated and real-time rate of water make-up B, controller 3 can be with adjusting automatic water replenishing valve door 1 with automatic
The aperture of water discharging valve 2, to control rate of water make-up and displacement.
In the system of the present invention, moisturizing line can be two, and therefore the preferred described automatic water supplement valve 1 of the present invention is 1
Individual or 2, but this is not limited by the present invention, and the visual concrete condition of quantity of automatic water supplement valve 1 sets.
Native system can be made up of collecting unit, control unit, display unit and performance element.Collecting unit on-line continuous
Ground gathers data, in order to prevent moisturizing and draining relay and valve from frequently switching on, arranges difference and dead band.Specifically, this joint
Water system can also include following device:
Water level signal table, for showing the water level of circulating cooling water tower, can monitor the change of water tower level, verify moisturizing
System is the most properly functioning.
Flow measurement device, arranges feature according to water circulating pump and system, choose different combined running operating mode (such as:
Single double pump runs, double speed runs, two-shipper contact operation etc.), measure different operating condition respectively in Various Seasonal, different unit is born
Circulating cooling water flow under lotus, and with the accuracy of the flow verification total flow of each branched pipe.
Temperature measuring equipment, is arranged in tower sparge pipe or vertical shaft, and temperature sleeves end, near pipeline center, is used for surveying
Amount enters the cooling water temperature of cooling tower entrance.
Native system, according to the water tower water yield, recirculated water concentration rate isoequilibrium relationship, is set up recirculated water and is accurately mended drainage technique mould
Type, draws the real-time rate of water make-up of recirculated water and displacement.Stable circulation water-cooled can be realized after using controller to automatically control
But tower water level, the purpose of stable circulation water concentration rate, thus reach the effect indirectly economized on water.
By technique scheme, the Large Copacity circulating cooling water tower using the present invention to provide is mended water discharge method and mends draining
System, calculates total evaporation Q, top evaporation capacity E and the local evaporation capacity C of circulating cooling water tower, according to circulating cooling water tower
Total evaporation Q, top evaporation capacity E, local evaporation amount C and correction factor ψ calculate the real-time rate of water make-up B of circulating cooling water tower
With water tower displacement M, thus carry out moisturizing according to real-time rate of water make-up B, and carry out draining according to water tower displacement M.The present invention carries
The circulating cooling water tower benefit water discharge method of confession and make-up and discharge system can draw the numerical value of real-time rate of water make-up and displacement, it is achieved two
The water level of secondary circulating cooling water tower and the accurate control of concentration rate, thus reach purpose and the effect of water saving.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, but, the present invention is not limited to above-mentioned reality
Execute the detail in mode, in the technology concept of the present invention, technical scheme can be carried out multiple letter
Monotropic type, these simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technical characteristic described in above-mentioned detailed description of the invention, at not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to various can
The compound mode of energy illustrates the most separately.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as it is without prejudice to this
The thought of invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. water discharge method mended by a Large Copacity circulating cooling water tower, it is characterised in that this benefit water discharge method includes:
Calculate the total evaporation Q of circulating cooling water tower；
Total evaporation Q, correction factor ψ, top evaporation capacity E and local evaporation capacity C according to described circulating cooling water tower calculate and follow
The real-time rate of water make-up B and water tower displacement M of ring cooling tower；And
Carry out moisturizing according to described real-time rate of water make-up B, carry out draining according to described water tower real-time displacement M.
Water discharge method mended by Large Copacity circulating cooling water tower the most according to claim 1, it is characterised in that described circulating cooling
The total evaporation Q of water tower is drawn by below equation: Q=E+C, and wherein E is circulating cooling water tower top evaporation capacity, and C is circulation
Cooling tower local evaporation amount.
Water discharge method mended by Large Copacity circulating cooling water tower the most according to claim 2, it is characterised in that described circulating cooling
Water tower top evaporation capacity E is drawn by below equation:Wherein Δ t is the temperature cooling down water of cooling tower gateway
It is poor to spend, and L is circulating water flow.
Water discharge method mended by Large Copacity circulating cooling water tower the most according to claim 2, it is characterised in that described circulating cooling
Water tower local evaporation amount C is the 0.1% of circulating water flow L.
Water discharge method mended by Large Copacity circulating cooling water tower the most according to claim 2, it is characterised in that described real-time moisturizing
Amount B is drawn by below equation with water tower displacement M:And dB-dM=dH+dE+dC, its
Middle Q is the total evaporation of circulating cooling water tower, and ψ is correction factor, and K is recirculated water concentration rate, and dB is the micro-of real-time rate of water make-up
Point, dM is the differential of water tower displacement, and dH is the differential of water tower level, and dE is the differential of top evaporation capacity, and dC is local evaporation
The differential of amount.
Water discharge method mended by Large Copacity circulating cooling water tower the most according to claim 5, it is characterised in that described correction factor
ψ is 0.90-0.95.
7. water discharge method mended by the Large Copacity circulating cooling water tower used in claim 1-6 described in any one claim
Large Copacity circulating cooling water tower make-up and discharge system, it is characterised in that this make-up and discharge system includes:
Automatic water supplement valve (1)；
Auto-drainage valve (2)；And
Controller (3), is connected with described automatic water supplement valve (1) and described Auto-drainage valve (2), is used for calculating water tower draining
Amount M and in real time rate of water make-up B, control the aperture of Auto-drainage valve (2) to control draining, Yi Jigen according to described displacement M
The aperture of described automatic water supplement valve (1) is controlled to control moisturizing according to described real-time rate of water make-up B.
Large Copacity circulating cooling water tower make-up and discharge system the most according to claim 7, it is characterised in that described automatic water supplement
Valve (1) is 2.
Large Copacity circulating cooling water tower make-up and discharge system the most according to claim 7, it is characterised in that this make-up and discharge system
Also include water level signal table, for showing the water level of circulating cooling water tower.
Large Copacity circulating cooling water tower make-up and discharge system the most according to claim 7, it is characterised in that this benefit draining system
System also includes temperature measuring equipment, for detecting the water temperature of cooling tower entrance cooling water.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014240A (en) * | 2017-03-03 | 2017-08-04 | 北京太阳宫燃气热电有限公司 | A kind of cooling tower cooling effectiveness monitoring method and system |
| CN107478090A (en) * | 2017-08-10 | 2017-12-15 | 北京百度网讯科技有限公司 | The method of supplying water and system of a kind of cooling tower |
| CN109521813A (en) * | 2018-11-13 | 2019-03-26 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | A kind of system and method for thermal power plant recirculated water concentration rate stability contorting |
| CN109931801A (en) * | 2019-03-26 | 2019-06-25 | 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 | A kind of power plant circulating cooling water tower basin automatic water replenishing system and method for supplementing water |
| CN111666670A (en) * | 2020-05-29 | 2020-09-15 | 鞍钢股份有限公司 | Method for determining water replenishing rate of circulating system through concentration ratio during impurity removal |
| CN112700627A (en) * | 2020-12-31 | 2021-04-23 | 新奥数能科技有限公司 | Method and device for alarming abnormality of water supply of cooling tower and terminal equipment |
| CN113409164A (en) * | 2021-08-19 | 2021-09-17 | 中冶节能环保有限责任公司 | Water quality early warning processing method and device for open-circuit circulating water system |
| CN113566639A (en) * | 2021-07-01 | 2021-10-29 | 深圳中广核工程设计有限公司 | Method and system for controlling circulating water discharge capacity of closed cooling tower |
| CN114485004A (en) * | 2022-02-22 | 2022-05-13 | 中冶长天国际工程有限责任公司 | Sintering plant equipment circulating cooling water system |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014240A (en) * | 2017-03-03 | 2017-08-04 | 北京太阳宫燃气热电有限公司 | A kind of cooling tower cooling effectiveness monitoring method and system |
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| CN107478090A (en) * | 2017-08-10 | 2017-12-15 | 北京百度网讯科技有限公司 | The method of supplying water and system of a kind of cooling tower |
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| CN109521813A (en) * | 2018-11-13 | 2019-03-26 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | A kind of system and method for thermal power plant recirculated water concentration rate stability contorting |
| CN109521813B (en) * | 2018-11-13 | 2023-08-29 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | System and method for stably controlling concentration ratio of circulating water of thermal power plant |
| CN109931801A (en) * | 2019-03-26 | 2019-06-25 | 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 | A kind of power plant circulating cooling water tower basin automatic water replenishing system and method for supplementing water |
| CN109931801B (en) * | 2019-03-26 | 2024-03-26 | 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 | Automatic water supplementing system and water supplementing method for circulating cooling water tower pool of thermal power plant |
| CN111666670A (en) * | 2020-05-29 | 2020-09-15 | 鞍钢股份有限公司 | Method for determining water replenishing rate of circulating system through concentration ratio during impurity removal |
| CN111666670B (en) * | 2020-05-29 | 2023-05-16 | 鞍钢股份有限公司 | Method for determining water supplementing rate of circulating system through concentration multiplying power when impurities are removed |
| CN112700627B (en) * | 2020-12-31 | 2022-11-04 | 新奥数能科技有限公司 | Method and device for alarming abnormality of water supply of cooling tower and terminal equipment |
| CN112700627A (en) * | 2020-12-31 | 2021-04-23 | 新奥数能科技有限公司 | Method and device for alarming abnormality of water supply of cooling tower and terminal equipment |
| CN113566639A (en) * | 2021-07-01 | 2021-10-29 | 深圳中广核工程设计有限公司 | Method and system for controlling circulating water discharge capacity of closed cooling tower |
| CN113566639B (en) * | 2021-07-01 | 2023-11-24 | 深圳中广核工程设计有限公司 | Method and system for controlling circulating water discharge capacity of closed cooling tower |
| CN113409164B (en) * | 2021-08-19 | 2022-01-25 | 中冶节能环保有限责任公司 | Water quality early warning processing method and device for open-circuit circulating water system |
| CN113409164A (en) * | 2021-08-19 | 2021-09-17 | 中冶节能环保有限责任公司 | Water quality early warning processing method and device for open-circuit circulating water system |
| CN114485004A (en) * | 2022-02-22 | 2022-05-13 | 中冶长天国际工程有限责任公司 | Sintering plant equipment circulating cooling water system |
| CN114485004B (en) * | 2022-02-22 | 2023-06-23 | 中冶长天国际工程有限责任公司 | Circulating cooling water system for equipment in sintering plant |
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| CN106091797B (en) | 2018-09-14 |
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Address after: 100011 Shenhua building, 22 West Binhe Road, Dongcheng District, Beijing Patentee after: China Shenhua Energy Co.,Ltd. Patentee after: National Energy Group Guohua Power Co.,Ltd. Patentee after: Guoneng Hebei Dingzhou Power Generation Co.,Ltd. Address before: 100011 Shenhua building, 22 West Binhe Road, Dongcheng District, Beijing Patentee before: China Shenhua Energy Co.,Ltd. Patentee before: BEIJING GUOHUA POWER Co.,Ltd. Patentee before: HEBEI GUOHUA DINGZHOU POWER GENERATION Co.,Ltd. |
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