CN103480614A - Quick dust removal method for coke oven gas conversion system - Google Patents
Quick dust removal method for coke oven gas conversion system Download PDFInfo
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- CN103480614A CN103480614A CN201310426363.7A CN201310426363A CN103480614A CN 103480614 A CN103480614 A CN 103480614A CN 201310426363 A CN201310426363 A CN 201310426363A CN 103480614 A CN103480614 A CN 103480614A
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- Prior art keywords
- coke oven
- oven gas
- pressure
- gas system
- converting coke
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- 239000000571 coke Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 28
- 239000000428 dust Substances 0.000 title abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 113
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 18
- 239000002918 waste heat Substances 0.000 claims abstract description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 13
- 238000007664 blowing Methods 0.000 claims abstract description 12
- 238000004458 analytical method Methods 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 238000010583 slow cooling Methods 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 239000002737 fuel gas Substances 0.000 claims description 3
- 239000010763 heavy fuel oil Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000001816 cooling Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Landscapes
- Coke Industry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Abstract
The invention relates to the technical field of dust removal process for coke oven gas conversion systems and provides a quick dust removal method for a coke oven gas conversion system. The method includes: stopping the coke oven gas conversion system safely, and closing all control valves in a closed state; opening a steam discharge valve and a residue guide valve on a waste heat boiler of the coke oven gas conversion system for steam pressure relief; connecting a pressure nitrogen pipeline, displacing residual coke oven gas and semi-water gas in the coke oven gas conversion system with nitrogen; slowly cooling a converter in the coke oven gas conversion system; closing all control valves in the coke oven gas conversion system to re-close the coke oven gas conversion system; introducing compressed air into a gas line of the coke oven gas conversion system to increase the inner pressure, relieving and blowing after continuous pressure keeping, and allowing dust and the like to be brought out of the system by impulsive force generated by differential pressure. The method has the advantages that production cost can be reduced, and dust removal efficiency and dust removal effect can be improved.
Description
Technical field
The present invention relates to the dust collecting process technical field of converting coke oven gas system, relate in particular to a kind of method of converting coke oven gas system fast dust-removing.
Background technology
Coke-stove gas can be used for synthetic ammonia or prepares methyl alcohol, is a kind of comprehensive utilization of resources technology, and is widely used.
The main equipment of converting coke oven gas system comprises reburner and is positioned at the waste heat boiler in reburner downstream.Be laid with many group heat exchanger tubes in the burner hearth of waste heat boiler, in tubulation mobile water by close with the lung waste heat boiler in high-temperature gas carry out heat exchange, thereby produce hot water or steam, the gas temperature in the waste heat boiler furnace chamber also decreases.Because the solid impurity content such as dust in coke-stove gas are higher, conversion system is after operation a period of time, and the ash deposit and slag buildup phenomenon is serious, affects heat-transfer effect, increases operating cost, therefore need to regularly be cleared up.The waste heat boiler outlet end socket that conventional method for cleaning be artificial unloading's reburner downstream, manually utilize forced air by the carbon distribution on the heat exchanging pipe of the many groups in waste heat boiler outer wall, black dirt, reach oxide etc. and take out of.
But not only human and material resources consumption is serious for this dust collection method, and also leave a large amount of dead angles, can not thoroughly blow down clean.After converting coke oven gas system driving next time, carbon distribution increases very fast, and heat transfer effect and conversion capability descend serious, thereby stop again and blow grey dedusting after the driving short period, cause production efficiency low.
Summary of the invention
The object of the present invention is to provide a kind of method of converting coke oven gas system fast dust-removing, be intended to reduce the human and material resources consumption in converting coke oven gas system dust removing process, improve efficiency of dust collection and dust removing effects, enhance productivity.
The present invention is achieved in that a kind of method of converting coke oven gas system fast dust-removing, comprises the following steps:
(1) closed system pipeline: described converting coke oven gas security of system is stopped, and close all control valves, make it in closed state;
(2) steam pressure release: open steam evacuation valve and showering guilding valve on the waste heat boiler in described converting coke oven gas system, carry out the steam pressure release;
(3) displacement residual gas: connect the pressurized nitrogen pipeline, coke-stove gas and semiwater gas residual in described converting coke oven gas system are replaced into to nitrogen;
(4) slow cooling: the reburner in described converting coke oven gas system is carried out to slow cooling;
(5) closed system pipeline again: close all control valves in whole described converting coke oven gas system, make described converting coke oven gas system again in closed state;
(6) build the pressure that rear pressure release is quick-fried blows: pass into compressed air to improve its internal pressure in the gas circuit of whole described converting coke oven gas system, built the pressure continuously that rear pressure release is quick-fried blows, the impulse force that utilizes pressure reduction to produce is taken out of the system such as black dirt.
As a kind of improved plan, in described step (3), after coke-stove gas residual in described converting coke oven gas system and semiwater gas are replaced into to nitrogen, system are carried out to sky and blow sample analysis, until residual fuel gas content is lower than 0.5%.
As a kind of improved plan, in described step (4), utilize blower fan to advertise air described reburner is lowered the temperature, in temperature-fall period, control 50 ± 5 ℃/h of rate of temperature fall, and the temperature of described reburner is down between 700～900 ℃.
As a kind of improved plan, in described step (6), quick-fried the blowing of pressure release is provided with following three phases altogether continuously:
First stage: the valve on standard-sized sheet forced air pipeline, open all showering guilding valves in described converting coke oven gas system, to be built the pressure, utilize blower fan to described converting coke oven gas system pressure-raising, when pressure reaches to 0.4～0.6Mpa, open fast manual atmospheric valve, pressure release is quick-fried blows; Repeatedly be operated to each showering guilding valve outlet without till the above particle carry-over of 5mm;
Second stage: the valve on standard-sized sheet forced air pipeline, close all showering guilding valves in described converting coke oven gas system, and close described manual atmospheric valve to be built the pressure, during to 80Kpa, open fast manual atmospheric valve when pressure, pressure release is quick-fried blows; Being cycled to repeat this operation, is white until blow out the color of thing from described converting coke oven gas system;
Phase III: the valve on standard-sized sheet forced air pipeline, open all showering guilding valves in described converting coke oven gas system, close manual atmospheric valve and built the pressure, when system pressure during to 80Kpa, open fast manual atmospheric valve, pressure release is quick-fried blows, until each showering guilding valve outlet is without carry-over.
As a kind of improved plan, after step (6), also comprise following treatment step:
(7) sample analysis: be blown into air in described converting coke oven gas system, and sample analysis, the oxygen content in described converting coke oven gas system >=18%, during fuel gas content≤15%, stop blowing; Raise the temperature on described reburner top to processing range, wait for and driving.
As a kind of improved plan, be provided with automatic air release valve in parallel with it on the installation pipeline of described manual atmospheric valve.
The method of converting coke oven gas system fast dust-removing provided by the invention, due to its adopt the quick-fried method of blowing of the rear pressure release that builds the pressure continuously by the carbon deposit that adheres on the main equipment of the conversion systems such as the intrasystem reburner of converting coke oven gas, waste heat boiler and inner-walls of duct, black dirt, and the granular impurity such as oxide from showering guilding valve and atmospheric valve, discharge.Both reduced reburner and stopped time of cooling, the human and material resources loss of having avoided the outlet end socket of dismounting waste heat boiler to bring, reduced production cost; And coke-stove gas residual in conversion system and semiwater gas are replaced into to nitrogen, and can effectively prevent from causing due to increasing of oxygen content in system in the process of building the pressure burning or the blast of combustibles, guaranteed the security in dust removal process; This conversion system is carried out to slow cooling, can effectively protect oxygen-enriched air in reburner/coke-stove gas nozzle, can guarantee again the safety of refractory material in conversion system, prevent that it from damaging in temperature-fall period.Adopt this kind of method, the coke-stove gas conversion system is blown to grey dedusting and effectively reduced the human and material resources consumption in dust removal process, both improved efficiency of dust collection and dust removing effects, improved again production efficiency.
The accompanying drawing explanation
Fig. 1 is the process chart of the converting coke oven gas system dust removing that provides of prior art;
Fig. 2 is the process chart of the method for the converting coke oven gas system fast dust-removing that provides of the embodiment of the present invention;
The specific embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 2 shows the process chart of the method for the converting coke oven gas system fast dust-removing that the embodiment of the present invention provides, and for convenience of explanation, this figure only provides the structure division relevant with the present invention.
A kind of method of converting coke oven gas system fast dust-removing comprises the following steps:
(1) closed system pipeline: this converting coke oven gas security of system is stopped, and close all control valves, make it in closed state;
(2) steam pressure release: open steam evacuation valve and showering guilding valve on the waste heat boiler in the converting coke oven gas system, carry out the steam pressure release, after the pressure release of waste heat boiler steam, can effectively prevent the steam system of bleeding, to such an extent as to increase the difficulty of blowing grey dedusting;
(3) displacement residual gas: connect the pressurized nitrogen pipeline, coke-stove gas residual in the converting coke oven gas system and semiwater gas are replaced into to nitrogen, and system is carried out to sky and blow sample analysis, until residual fuel gas content is lower than 0.5%, coke-stove gas residual in conversion system and semiwater gas are replaced into to nitrogen, can effectively prevent from causing due to increasing of oxygen content in system in the process of building the pressure burning or the blast of combustibles, guarantee the security in dust removal process;
(4) slow cooling: the reburner in the coke-stove gas conversion system is carried out to slow cooling, in temperature-fall period, control 50 ± 5 ℃/h of rate of temperature fall, can effectively protect oxygen-enriched air in reburner/coke-stove gas nozzle, can guarantee again in conversion system that refractory material is as corundum brick, refractory liner, the safety that burner turns etc., prevent that it from damaging in temperature-fall period, because of in blowing grey process, temperature in reburner also can reduce, the temperature of reburner is down between 700～900 ℃, can blow under the prerequisite of grey dust removing effects in assurance, after guaranteeing that dedusting finishes, igniting is driven again temperature and security,
(5) closed system pipeline again: close all control valves in whole converting coke oven gas system, make the converting coke oven gas system again in closed state;
(6) build the pressure that rear pressure release is quick-fried blows: pass into compressed air to improve its internal pressure in the gas circuit of whole converting coke oven gas system, built the pressure continuously that rear pressure release is quick-fried blows, the impulse force that utilizes pressure reduction to produce is taken out of the system such as black dirt.Wherein, this process is divided into three phases:
First stage: the valve on standard-sized sheet forced air pipeline, open all showering guilding valves in the converting coke oven gas system, to be built the pressure, utilize blower fan to coke-stove gas conversion system pressure-raising, when pressure reaches to 0.4～0.6Mpa, open fast manual atmospheric valve, pressure release is quick-fried blows; Repeatedly be operated to each showering guilding valve outlet without till the above particle carry-over of 5mm;
Second stage: the valve on standard-sized sheet forced air pipeline, close all showering guilding valves in the converting coke oven gas system, and close manual atmospheric valve to be built the pressure, during to 80Kpa, open fast manual atmospheric valve when pressure, pressure release is quick-fried blows; Being cycled to repeat this operation, is white until blow out the color of thing from the converting coke oven gas system;
Phase III: the valve on standard-sized sheet forced air pipeline, open all showering guilding valves in the converting coke oven gas system, close manual atmospheric valve and built the pressure, when system pressure during to 80Kpa, open fast manual atmospheric valve, pressure release is quick-fried blows, until each showering guilding valve outlet is without carry-over.
(7) sample analysis: be blown into air in the converting coke oven gas system, and sample analysis, the oxygen content in the converting coke oven gas system >=18%, during fuel gas content≤15%, stop blowing; The temperature on rising reburner top, to processing range, is waited for and being driven, and to carrying out sample analysis in the system that completes dedusting, and controls its oxygen and combustible content, can prevent that it from potential safety hazard occurring, and guarantees that the safety of activity in production is carried out.
Than dust collection method of the prior art (as shown in Figure 1), because it adopts the rear quick emptying that builds the pressure continuously, the quick-fried method of blowing of moment pressure release, by the carbon deposit that adheres on the main equipment of the conversion systems such as reburner, waste heat boiler and inner-walls of duct, black dirt, and oxide take out of.Both reduced reburner and stopped time of cooling, the human and material resources loss of having avoided the outlet end socket of dismounting waste heat boiler to bring, reduced production cost, both improved efficiency of dust collection and dust removing effects, improved again production efficiency.
In this embodiment, on the installation pipeline of manual atmospheric valve in parallel with it be provided with automatic air release valve after, in dust removal process, the operator only need carry out operated from a distance at master-control room, can complete the grey emptying work of blowing of whole system, avoid operating personnel to open at the scene the potential safety hazard that manual emptying brings.
The method of converting coke oven gas system fast dust-removing provided by the invention, due to its adopt the quick-fried method of blowing of the rear pressure release that builds the pressure continuously by the carbon deposit that adheres on the main equipment of the conversion systems such as the intrasystem reburner of converting coke oven gas, waste heat boiler and inner-walls of duct, black dirt, and the granular impurity such as oxide from showering guilding valve and atmospheric valve, discharge.Both reduced reburner and stopped time of cooling, the human and material resources loss of having avoided the outlet end socket of dismounting waste heat boiler to bring, reduced production cost; And coke-stove gas residual in conversion system and semiwater gas are replaced into to nitrogen, and can effectively prevent from causing due to increasing of oxygen content in system in the process of building the pressure burning or the blast of combustibles, guaranteed the security in dust removal process; This conversion system is carried out to slow cooling, can effectively protect oxygen-enriched air in reburner/coke-stove gas nozzle, can guarantee again the safety of refractory material in conversion system, prevent that it from damaging in temperature-fall period.Adopt this kind of method, the coke-stove gas conversion system is blown to grey dedusting and effectively reduced the human and material resources consumption in dust removal process, both improved efficiency of dust collection and dust removing effects, improved again production efficiency.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. the method for a converting coke oven gas system fast dust-removing, is characterized in that, comprises the following steps:
(1) closed system pipeline: described converting coke oven gas security of system is stopped, and close all control valves, make it in closed state;
(2) steam pressure release: open steam evacuation valve and showering guilding valve on the waste heat boiler in described converting coke oven gas system, carry out the steam pressure release;
(3) displacement residual gas: connect the pressurized nitrogen pipeline, coke-stove gas and semiwater gas residual in described converting coke oven gas system are replaced into to nitrogen;
(4) slow cooling: the reburner in described converting coke oven gas system is carried out to slow cooling;
(5) closed system pipeline again: close all control valves in whole described converting coke oven gas system, make described converting coke oven gas system again in closed state;
(6) build the pressure that rear pressure release is quick-fried blows: pass into compressed air to improve its internal pressure in the gas circuit of whole described converting coke oven gas system, built the pressure continuously that rear pressure release is quick-fried blows, the impulse force that utilizes pressure reduction to produce is taken black dirt out of system.
2. the method for converting coke oven gas system fast dust-removing as claimed in claim 1, it is characterized in that: in described step (3), coke-stove gas residual in described converting coke oven gas system and semiwater gas are replaced in the nitrogen process, gas in conversion system is carried out to sample analysis, lower than 0.5% the time, stop displacement when residual fuel gas content.
3. the method for converting coke oven gas system fast dust-removing as claimed in claim 1, it is characterized in that: in described step (4), utilizing blower fan to advertise air is lowered the temperature to described reburner, in temperature-fall period, control rate of temperature fall at 50 ± 5 ℃/h, and the temperature of described reburner is down between 700～900 ℃.
4. the method for converting coke oven gas system fast dust-removing as claimed in claim 1, is characterized in that, in described step (6), quick-fried the blowing of pressure release is provided with following three phases altogether continuously:
First stage: the valve on standard-sized sheet forced air pipeline, open all showering guilding valves in described converting coke oven gas system, to be built the pressure, utilize forced air to described converting coke oven gas system pressure-raising, when pressure reaches to 0.4～0.6Mpa, open fast manual atmospheric valve, pressure release is quick-fried blows; Operation repeatedly, to the outlet of each showering guilding valve without till the above particle carry-over of 5mm;
Second stage: the valve on standard-sized sheet forced air pipeline, close all showering guilding valves in described converting coke oven gas system, and close described manual atmospheric valve to be built the pressure, during to 80Kpa, open fast manual atmospheric valve when pressure, pressure release is quick-fried blows; Being cycled to repeat this operation, is white until blow out the color of thing from described converting coke oven gas system;
Phase III: the valve on standard-sized sheet forced air pipeline, open all showering guilding valves in described converting coke oven gas system, close manual atmospheric valve and built the pressure, when system pressure during to 80Kpa, open fast manual atmospheric valve, pressure release is quick-fried blows, until each showering guilding valve outlet is without carry-over.
5. the method for converting coke oven gas system fast dust-removing as claimed in claim 1, is characterized in that, after step (6), also comprises following treatment step:
(7) sample analysis: be blown into air in described converting coke oven gas system, and sample analysis, the oxygen content in described converting coke oven gas system >=18%, during fuel gas content≤15%, stop blowing; Raise the temperature on described reburner top to processing range, wait for and driving.
6. the method for converting coke oven gas system fast dust-removing as described as claim 1 to 5 any one, is characterized in that: be provided with automatic air release valve in parallel with it on the installation pipeline of described manual atmospheric valve.
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| CN201310426363.7A CN103480614B (en) | 2013-09-17 | 2013-09-17 | Quick dust removal method for coke oven gas conversion system |
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| CN201310426363.7A CN103480614B (en) | 2013-09-17 | 2013-09-17 | Quick dust removal method for coke oven gas conversion system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105414119A (en) * | 2015-12-29 | 2016-03-23 | 瓮福达州化工有限责任公司 | Steam sweeping and blowing method at purification section of wet process phosphoric acid |
| CN105562406A (en) * | 2014-10-14 | 2016-05-11 | 洛阳瑞昌石油化工设备有限公司 | Coke removing method for inner wall of metal cavity |
| CN106311677A (en) * | 2016-09-29 | 2017-01-11 | 江苏通泰工业科技有限公司 | High-pressure die-casting air blowing and exhausting auxiliary system for mold inserts and implementation method thereof |
| CN110883035A (en) * | 2019-11-21 | 2020-03-17 | 中国核动力研究设计院 | Control method for residual material quantity of standard container |
| CN113970912A (en) * | 2021-11-01 | 2022-01-25 | 河南晋开化工投资控股集团有限责任公司 | Complete equipment matched with synthetic ammonia device |
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| JPS5936187A (en) * | 1982-08-24 | 1984-02-28 | Nippon Steel Corp | Method for cleaning lid of coke oven |
| JPS63142092A (en) * | 1986-12-05 | 1988-06-14 | Kawasaki Refract Co Ltd | Cleaning and mending apparatus for cylindrical opening of coke oven or such |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105562406A (en) * | 2014-10-14 | 2016-05-11 | 洛阳瑞昌石油化工设备有限公司 | Coke removing method for inner wall of metal cavity |
| CN105414119A (en) * | 2015-12-29 | 2016-03-23 | 瓮福达州化工有限责任公司 | Steam sweeping and blowing method at purification section of wet process phosphoric acid |
| CN106311677A (en) * | 2016-09-29 | 2017-01-11 | 江苏通泰工业科技有限公司 | High-pressure die-casting air blowing and exhausting auxiliary system for mold inserts and implementation method thereof |
| CN110883035A (en) * | 2019-11-21 | 2020-03-17 | 中国核动力研究设计院 | Control method for residual material quantity of standard container |
| CN110883035B (en) * | 2019-11-21 | 2021-05-04 | 中国核动力研究设计院 | Control method for residual material quantity of standard container |
| CN113970912A (en) * | 2021-11-01 | 2022-01-25 | 河南晋开化工投资控股集团有限责任公司 | Complete equipment matched with synthetic ammonia device |
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| Publication number | Publication date |
|---|---|
| CN103480614B (en) | 2015-06-17 |
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