CN108413521A - A kind of natural cooling and the united water cooling air conditioning system of mechanical refrigeration - Google Patents
A kind of natural cooling and the united water cooling air conditioning system of mechanical refrigeration Download PDFInfo
- Publication number
- CN108413521A CN108413521A CN201810194019.2A CN201810194019A CN108413521A CN 108413521 A CN108413521 A CN 108413521A CN 201810194019 A CN201810194019 A CN 201810194019A CN 108413521 A CN108413521 A CN 108413521A
- Authority
- CN
- China
- Prior art keywords
- chilled water
- cold
- heat exchanger
- electrically operated
- operated valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
Abstract
The invention discloses a kind of natural coolings and the united water cooling air conditioning system of mechanical refrigeration, including：At least two groups of chilled water return pipe, chilled water feed pipe, First Heat Exchanger, the second heat exchanger, the first cold, the second cold, the first chilled water pump, the second chilled water pump；The First Heat Exchanger, the second heat exchanger are in parallel, and first cold, the second cold are in parallel.The present invention improves design, layout flexibility, saves space.Heat exchanger need not be corresponded with cold, and number of units can be in any combination.It is more energy saving, it can guarantee and flow through cold minimum discharge, and do not influence the useful space of heat exchanger natural cooling；Increase heat exchange area and reduce resistance, increase heat exchange area and improve heat exchange efficiency, reducing resistance reduces pump energy consumption.Reliability is improved, part natural cooling pattern heat exchanger, cold need not correspond, and can arbitrarily number of units combine, increase redundancy.Water pump, cold, heat exchanger number of units can be freely combined, and redundancy be formed, to improve reliability.
Description
Technical field
The present invention relates to Water cooled air conditioners technical field more particularly to a kind of natural cooling and the united water cooling of mechanical refrigeration are empty
Adjusting system.
Background technology
Currently, the air conditioning energy consumption of data center is huge, other than IT facility energy requirements, 70% or more energy consumption in
Air-conditioning system.The air-conditioning system of relatively large data center is mostly water cooling air conditioning system, in order to make full use of winter, transition season room
Outer low temperature natural cooling source is typically designed to natural cooling and the united water cooling air conditioning system of mechanical refrigeration, and whole year can be divided into three kinds
Operating mode.In summer, when outside air temperature is higher, only freezed by compressed action by cold, abbreviation mechanical refrigeration.In the autumn and winter or
Winter-Spring transition season when outside air temperature is relatively low, first passes through heat exchanger heat exchange cooling and is freezed again by cold, cooperation, achievement unit
Divide natural cooling.In winter, when outside air temperature is low, system cooling needs only can be met by heat exchanger heat exchange cooling, realized
Complete natural cooling.Prior art is as shown in Figure 1.
Wherein, 140 chilled water return water；150 chilled waters supply water；110a-b heat exchangers；120a-b cold；121a-b cold is steamed
Send out device side chilled water outlet；122a-b cold vaporizer side chilled water inlets；111a-b heat exchangers freezing side chilled water outlet (is asked
Confirm whether inlet and outlet number should be consistent with Fig. 2)；112a-b heat exchangers freeze side chilled water inlet；130a-b is freezed
Water pump；
Prior art, as shown in Figure 1, its feature：
(1) heat exchanger, cold constitute jointly, and correspond.
(2) by-passing valve (170) is arranged in chilled water return water main pipe and chilled water on the by-pass line between water conduit tube, cold
Freeze water backwater end before A points, chilled water is for water end (W.E.) after B points.
(3) three kinds of operating modes.Mechanical refrigeration pattern：That is cold separate refrigeration, electrically operated valve 113a-b, 124a-b are beaten
It opens, electrically operated valve 114a-b, 123a are closed.Part natural cooling pattern：Electrically operated valve 113a-b, 123a-b are opened, motor-driven valve
Door 114a-b, 124a-b are closed, and chilled water is returned provides circulation power by chilled water pump, first flows through heat exchanger and heat exchanger cold side
Cooling water exchanges heat, and reduces portion temperature, then flow into cold and flowed out after mechanical refrigeration.Complete natural cooling pattern：Cold
It closes, is only exchanged heat and freezed by heat exchanger, electrically operated valve 113a-b, 124a-b are closed, and electrically operated valve 114a-b, 123a are opened.
(4) end load demand reduces, and to ensure to flow through the requirement of cold minimum discharge, can adjust chilled water by-passing valve, make
The water supply of partial freeze water is obtained to mix with chilled water return water by chilled water by-passing valve.
The shortcomings that existing design scheme：
(1) not energy saving enough.Under the natural cooling pattern of part, when if you need to adjust by-passing valve, partial freeze water is supplied water and is returned
Water mixing drags down chilled water return water temperature, reduces the useful space of heat exchanger natural cooling, shortens part natural cooling
Duration, to constrain the natural cooling heat exchange energy saving space.
(2) space requirement is high, and layout is dumb, and single-point possible breakdown is more.Each refrigeration unit heat exchanger and cold palpus one
One corresponds to, and the flexibility for designing and being laid out is influenced, especially in the case where space is limited；Refrigeration unit chilled water side needs 4 electricity
Movable valve switching working mode, valve increase control complexity more, increase possible breakdown point, it is desirable that broader arrangement space.
(3) reliability is not high.Each refrigeration unit heat exchanger must be corresponded with cold, heat exchanger or cold or unit pipes
Part damage failure causes entire cell failure, such as the heat exchanger failure of a unit, and another unit cold fault, then simultaneously
Cause two cell failures.
Invention content
In view of the drawbacks described above of the prior art, technical problem to be solved by the invention is to provide a kind of natural cooling with
The united water cooling air conditioning system of mechanical refrigeration, so as to solve the deficiencies in the prior art.
To achieve the above object, the present invention provides a kind of natural cooling and the united water cooling air conditioning system of mechanical refrigeration,
Including：At least two groups of chilled water return pipe, chilled water feed pipe, First Heat Exchanger, the second heat exchanger, the first cold,
Two cold, the first chilled water pump, the second chilled water pump；The first cold vaporizer side chilled water is respectively set in first cold
It exports, the first cold vaporizer side chilled water inlet, the second cold vaporizer side chilled water is respectively set in second cold
It exports, the second cold vaporizer side chilled water inlet, First Heat Exchanger freezing side freezing is respectively set on the First Heat Exchanger
Water inlet, First Heat Exchanger freeze side chilled water outlet, and it is cold that the second heat exchanger freezing side is respectively set on second heat exchanger
Freeze water inlet, the second heat exchanger freezes side chilled water outlet；The First Heat Exchanger, the second heat exchanger are in parallel, and described first is cold
Machine, the second cold are in parallel, wherein the chilled water return pipe delivery outlet is connected by the first electrically operated valve, the second electrically operated valve respectively
Logical First Heat Exchanger freezing side chilled water inlet, the second heat exchanger freeze side chilled water inlet, the chilled water return pipe output
Mouth is also connected with third electrically operated valve input terminal, and the third electrically operated valve output end goes out with First Heat Exchanger freezing side chilled water
Mouthful, the second heat exchanger freezing side chilled water outlet is gathered together and is respectively outputted to the 4th electrically operated valve, the first chilled water pump, the
Two chilled water pumps, the first cold vaporizer side chilled water outlet, the second cold vaporizer side chilled water outlet pass through pipeline
It is connected to chilled water feed pipe.
A kind of above-mentioned natural cooling and the united water cooling air conditioning system of mechanical refrigeration, first chilled water pump, second
Chilled water pump connects the first cold vaporizer side chilled water inlet, second by the 5th electrically operated valve, the 6th electrically operated valve respectively
Cold vaporizer side chilled water inlet.
A kind of above-mentioned natural cooling and the united water cooling air conditioning system of mechanical refrigeration, the first chilled water pump output end
Pipeline and the pipeline of the first cold vaporizer side chilled water outlet output end between connect the 7th electrically operated valve；Described second is cold
The pipeline frozen between the pipeline and the second cold vaporizer side chilled water outlet output end of water pump output end connects the 8th motor-driven valve
Door.
A kind of above-mentioned natural cooling and the united water cooling air conditioning system of mechanical refrigeration, first chilled water pump, second
Chilled water pump output end is all connected with the 9th electrically operated valve one end, and the 9th electrically operated valve other end connects the first cold evaporator
Side chilled water outlet, the second cold vaporizer side chilled water outlet.
The beneficial effects of the invention are as follows：
1) design, layout flexibility are improved, space is saved.Heat exchanger need not be corresponded with cold, and number of units can appoint
Meaning combination, such as：3 heat exchangers, 2 cold；Electrically operated valve number needed for operating mode switching is reduced, and placement position disperses,
Space is saved, it is highly beneficial to site space virtual item.
2) more energy saving.Under the natural cooling pattern of part, when if you need to adjust by-passing valve, since chilled water return water first passes through
Heat exchanger carries out part natural cooling heat exchange, is mixed again with the water supply of the chilled water of bypass later, both can guarantee and has flowed through cold minimum
Flow, and the useful space of heat exchanger natural cooling is not influenced；In addition, under the natural cooling pattern of part, heat exchange can be run
Device number can be more than operation cold number, increase operation heat exchanger number, that is, increase heat exchange area and reduce resistance, increase heat exchange area and carry
High heat exchange efficiency, reducing resistance reduces pump energy consumption.
3) reliability is improved.Electrically operated valve quantity is reduced, that is, reduces single-point possible breakdown point.Part natural cooling pattern is changed
Hot device, cold need not correspond, and can arbitrarily number of units combine, increase redundancy.Being connected between water pump and cold also need not one
One corresponding absorbed mode, water pump, cold, heat exchanger number of units can be freely combined, and redundancy be formed, to improve reliability.
The technique effect of the design of the present invention, concrete structure and generation is described further below with reference to attached drawing, with
It is fully understood from the purpose of the present invention, feature and effect.
Description of the drawings
Fig. 1 is the water cooling air conditioning system structural schematic diagram of the prior art.
Fig. 2 is the water cooling air conditioning system structural schematic diagram of the present invention.
Fig. 3 is another example structure schematic diagram of water cooling air conditioning system of the present invention.
Specific implementation mode
As shown in Fig. 2, a kind of natural cooling and the united water cooling air conditioning system of mechanical refrigeration, including：At least two groups
Chilled water return pipe 240, chilled water feed pipe 250, First Heat Exchanger 210a, the second heat exchanger 210b, the first cold 220a,
Two cold 220b, the first chilled water pump 230a, the second chilled water pump 230b；It is cold it to be respectively set first on the first cold 220a
Divide on machine vaporizer side chilled water outlet 221a, the first cold vaporizer side chilled water inlet 222a, the second cold 220b
Second cold vaporizer side chilled water outlet 221b, the second cold vaporizer side chilled water inlet 222b be not set, described first
First Heat Exchanger freezing side chilled water inlet 211a, First Heat Exchanger freezing side chilled water outlet are respectively set on heat exchanger 210a
It is cold that the second heat exchanger freezing side chilled water inlet 211b, the second heat exchanger are respectively set on 212a, the second heat exchanger 210b
Freeze side chilled water outlet 212b；The First Heat Exchanger 210a, the second heat exchanger 210b are in parallel, the first cold 220a, the
Two cold 220b are in parallel, wherein 240 delivery outlet of chilled water return pipe is respectively by the first electrically operated valve 213a, second electronic
Valve 213b connection First Heat Exchanger freezings side chilled water inlet 211a, the second heat exchanger freeze side chilled water inlet 211b, institute
It states 240 delivery outlet of chilled water return pipe and is also connected with 260 input terminal of third electrically operated valve, 260 output end of third electrically operated valve
It is gathered together difference with First Heat Exchanger freezing side chilled water outlet 212a, the second heat exchanger freezing side chilled water outlet 212b
It is output to the 4th electrically operated valve 270, the first chilled water pump 230a, the second chilled water pump 230b, the first cold vaporizer side
Chilled water outlet 221a, the second cold vaporizer side chilled water outlet 221b are connected to chilled water feed pipe 250 by pipeline.
The first chilled water pump 230a, the second chilled water pump 230b pass through the 5th electrically operated valve 223a, the 6th electricity respectively
Movable valve 223b connection the first cold vaporizer side chilled water inlets 222a, the second cold vaporizer side chilled water inlet 222b.
The pipeline of the first chilled water pump 230a output ends and the first cold vaporizer side chilled water outlet 221a are exported
The 7th electrically operated valve 224a is connected between the pipeline at end；The pipeline of the second chilled water pump 230b output ends and the second cold are steamed
The pipeline sent out between the chilled water outlet 221b output ends of device side connects the 8th electrically operated valve 224b.
As shown in figure 3, the first chilled water pump 230a, the second chilled water pump 230b output ends are all connected with the 9th motor-driven valve
280 one end of door, 280 other end of the 9th electrically operated valve connect the first cold vaporizer side chilled water outlet 221a, second cold
Machine vaporizer side chilled water outlet 221b.
The present invention and prior art the difference is that：As shown in Fig. 2, heat exchanger is in parallel with heat exchanger, cold with
Cold is in parallel, and the heat exchanger after parallel connection is connected with the cold after parallel connection.Refrigeration mode：The opening of electrically operated valve 260, all heat exchangers
The electrically operated valve 213a-b for freezing side chilled water inlet is closed, the cold vaporizer side chilled water inlet electrically operated valve to be run
223a-b is opened, and electrically operated valve 224a-b is closed, the chilled water pump 230a-b operations corresponding to the cold to be run.Fig. 3 is this
Another embodiment of invention.
The present invention has the advantage that：
1) design, layout flexibility are improved, space is saved.Heat exchanger need not be corresponded with cold, and number of units can appoint
Meaning combination, such as：3 heat exchangers, 2 cold；Electrically operated valve number needed for operating mode switching is reduced, and placement position disperses,
Space is saved, it is highly beneficial to site space virtual item.Meanwhile chilled water return pipe 240 of the invention, chilled water feed pipe
250, First Heat Exchanger 210a, the second heat exchanger 210b, the first cold 220a, the second cold 220b, the first chilled water pump 230a,
Second chilled water pump 230b is also not limited only to two groups of cascades in attached drawing, can be as needed for three groups or three groups or more
The basic unit of cascade, multigroup cascade structure is exactly the given attached drawing structure of the present invention.
2) more energy saving.Under the natural cooling pattern of part, when if you need to adjust by-passing valve, since chilled water return water first passes through
Heat exchanger carries out part natural cooling heat exchange, is mixed again with the water supply of the chilled water of bypass later, both can guarantee and has flowed through cold minimum
Flow, and the useful space of heat exchanger natural cooling is not influenced；In addition, under the natural cooling pattern of part, heat exchange can be run
Device number can be more than operation cold number, increase operation heat exchanger number, that is, increase heat exchange area and reduce resistance, increase heat exchange area and carry
High heat exchange efficiency, reducing resistance reduces pump energy consumption.
3) reliability is improved.Electrically operated valve quantity is reduced, that is, reduces single-point possible breakdown point.Part natural cooling pattern is changed
Hot device, cold need not correspond, and can arbitrarily number of units combine, increase redundancy.In the another embodiment of Fig. 3, water pump
Mode need not be also absorbed in correspondingly by being connected between cold, and water pump, cold, heat exchanger number of units can be freely combined, and be formed
Redundancy, to improve reliability.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be in the protection domain being defined in the patent claims.
Claims (4)
1. a kind of natural cooling and the united water cooling air conditioning system of mechanical refrigeration, which is characterized in that including：At least two groups cold
Freeze water return pipe (240), chilled water feed pipe (250), First Heat Exchanger (210a), the second heat exchanger (210b), the first cold
(220a), the second cold (220b), the first chilled water pump (230a), the second chilled water pump (230b)；First cold
The first cold vaporizer side chilled water outlet (221a), the first cold vaporizer side chilled water inlet are respectively set on (220a)
The second cold vaporizer side chilled water outlet (221b), the second cold is respectively set on second cold (220b) in (222a)
First Heat Exchanger freezing side chilled water is respectively set on the First Heat Exchanger (210a) for vaporizer side chilled water inlet (222b)
The is respectively set on second heat exchanger (210b) for entrance (211a), First Heat Exchanger freezing side chilled water outlet (212a)
Two heat exchangers freeze side chilled water inlet (211b), the second heat exchanger freezing side chilled water outlet (212b)；First heat exchange
Device (210a), the second heat exchanger (210b) are in parallel, and first cold (220a), the second cold (220b) are in parallel, wherein described
Chilled water return pipe (240) delivery outlet passes through the first electrically operated valve (213a), the second electrically operated valve (213b) connection first respectively
Heat exchanger freezes side chilled water inlet (211a), the second heat exchanger freezing side chilled water inlet (211b), the chilled water return water
Pipe (240) delivery outlet is also connected with third electrically operated valve (260) input terminal, third electrically operated valve (260) output end and first
Heat exchanger freezing side chilled water outlet (212a), the second heat exchanger freezing side chilled water outlet (212b) are gathered together defeated respectively
Go out to the 4th electrically operated valve (270), the first chilled water pump (230a), the second chilled water pump (230b), the first cold evaporation
Device side chilled water outlet (221a), the second cold vaporizer side chilled water outlet (221b) are connected to chilled water feed pipe by pipeline
(250)。
2. a kind of natural cooling as described in claim 1 and the united water cooling air conditioning system of mechanical refrigeration, it is characterised in that：Institute
The first chilled water pump (230a), the second chilled water pump (230b) are stated respectively by the 5th electrically operated valve (223a), the 6th motor-driven valve
Door (223b) connects the first cold vaporizer side chilled water inlet (222a), the second cold vaporizer side chilled water inlet
(222b)。
3. a kind of natural cooling as claimed in claim 2 and the united water cooling air conditioning system of mechanical refrigeration, it is characterised in that：Institute
State the pipe of the pipeline and first cold vaporizer side chilled water outlet (221a) output end of the first chilled water pump (230a) output end
The 7th electrically operated valve (224a) is connected between road；The pipeline of second chilled water pump (230b) output end and the second cold are evaporated
Pipeline between device side chilled water outlet (221b) output end connects the 8th electrically operated valve (224b).
4. a kind of natural cooling as claimed in claim 2 and the united water cooling air conditioning system of mechanical refrigeration, it is characterised in that：Institute
State the first chilled water pump (230a), the second chilled water pump (230b) output end is all connected with the 9th electrically operated valve (280) one end, described
9th electrically operated valve (280) other end connects the first cold vaporizer side chilled water outlet (221a), the second cold vaporizer side
Chilled water outlet (221b).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810194019.2A CN108413521A (en) | 2018-03-09 | 2018-03-09 | A kind of natural cooling and the united water cooling air conditioning system of mechanical refrigeration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810194019.2A CN108413521A (en) | 2018-03-09 | 2018-03-09 | A kind of natural cooling and the united water cooling air conditioning system of mechanical refrigeration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108413521A true CN108413521A (en) | 2018-08-17 |
Family
ID=63130851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810194019.2A Pending CN108413521A (en) | 2018-03-09 | 2018-03-09 | A kind of natural cooling and the united water cooling air conditioning system of mechanical refrigeration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108413521A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611980A (en) * | 2018-10-31 | 2019-04-12 | 厦门华睿晟智能科技有限责任公司 | A kind of air-conditioning water piping system and air-conditioning system |
| CN111389330A (en) * | 2020-03-25 | 2020-07-10 | 河南神马尼龙化工有限责任公司 | Reaction temperature stability maintaining system of adipic acid production system by nitric acid oxidation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032930A (en) * | 2012-12-26 | 2013-04-10 | 深圳市英维克科技有限公司 | Temperature control device |
| CN203385120U (en) * | 2013-07-15 | 2014-01-08 | 江苏省邮电规划设计院有限责任公司 | Electronic information machine room coupled cooling system |
| CN103912945A (en) * | 2014-04-14 | 2014-07-09 | 浪潮电子信息产业股份有限公司 | Natural cooling water-cooled air conditioner system |
| CN203964473U (en) * | 2014-06-26 | 2014-11-26 | 华仁药业股份有限公司 | Chilled water is produced system |
-
2018
- 2018-03-09 CN CN201810194019.2A patent/CN108413521A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032930A (en) * | 2012-12-26 | 2013-04-10 | 深圳市英维克科技有限公司 | Temperature control device |
| CN203385120U (en) * | 2013-07-15 | 2014-01-08 | 江苏省邮电规划设计院有限责任公司 | Electronic information machine room coupled cooling system |
| CN103912945A (en) * | 2014-04-14 | 2014-07-09 | 浪潮电子信息产业股份有限公司 | Natural cooling water-cooled air conditioner system |
| CN203964473U (en) * | 2014-06-26 | 2014-11-26 | 华仁药业股份有限公司 | Chilled water is produced system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611980A (en) * | 2018-10-31 | 2019-04-12 | 厦门华睿晟智能科技有限责任公司 | A kind of air-conditioning water piping system and air-conditioning system |
| CN111389330A (en) * | 2020-03-25 | 2020-07-10 | 河南神马尼龙化工有限责任公司 | Reaction temperature stability maintaining system of adipic acid production system by nitric acid oxidation method |
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Application publication date: 20180817 |