CN208136190U - Naphthalene system is washed in coal gas primary cooler sprinkling - Google Patents
Naphthalene system is washed in coal gas primary cooler sprinkling Download PDFInfo
- Publication number
- CN208136190U CN208136190U CN201820299838.9U CN201820299838U CN208136190U CN 208136190 U CN208136190 U CN 208136190U CN 201820299838 U CN201820299838 U CN 201820299838U CN 208136190 U CN208136190 U CN 208136190U
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- China
- Prior art keywords
- upper section
- lower section
- liquid bath
- sprinkling
- primary cooler
- 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.)
- Expired - Fee Related
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- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 title claims abstract description 90
- 239000003034 coal gas Substances 0.000 title claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 86
- 238000009833 condensation Methods 0.000 claims abstract description 38
- 230000005494 condensation Effects 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000000926 separation method Methods 0.000 claims abstract description 31
- 238000011010 flushing procedure Methods 0.000 claims abstract description 19
- 230000008676 import Effects 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 239000007921 spray Substances 0.000 claims description 21
- 239000004519 grease Substances 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 12
- 238000004064 recycling Methods 0.000 description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- 238000001816 cooling Methods 0.000 description 5
- 238000002425 crystallisation Methods 0.000 description 5
- 230000008025 crystallization Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 235000019198 oils Nutrition 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000019476 oil-water mixture Nutrition 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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- Industrial Gases (AREA)
Abstract
The utility model relates to gas cleaning system fields more particularly to a kind of sprinkling of coal gas primary cooler to wash naphthalene system.The utility model includes lower section sprinkling self-circulation system, upper section sprinkling self-circulation system and tar mixed liquor make-up system, upper section sprinkling self-circulation system includes upper section condensation liquid bath and upper section pump, the upper section condensate outlet of upper section condensation liquid bath is divided into two-way after upper section pumps, it is connect all the way with the upper section flushing liquor import of primary cooler, another way is sent outside by sending regulating valve outside to gas piping is inhaled, and the upper section flushing liquor of the first condensate inlet of upper section and primary cooler that upper section condenses liquid bath, which exports, to be connected；Tar mixed liquor make-up system includes oil-water separation tank, and the liquid outlet of oil-water separation tank is divided into two-way, is connect all the way with the lower section tar mixed liquor supply entrance of lower section condensation liquid bath, and another way upper section condenses the upper section tar mixed liquor supply entrance connection of liquid bath；The flowing full outlet of lower section condensation liquid bath is connect by pipeline with the second condensate inlet of upper section that upper section condenses liquid bath.
Description
Technical field
The utility model relates to gas cleaning system fields more particularly to a kind of sprinkling of coal gas primary cooler to wash naphthalene system.
Background technique
Naphthalene content is high in gas temperature height and coal gas from coke oven, while cooling using primary cooler to coal gas,
Naphthalene saturated vapor content reduces rapidly, and a large amount of naphthalene, which is precipitated in the cooling pipe outer wall for not only condensing in primary cooler, influences primary cooler
Heat transfer effect, and be easy to cause equipment pipe to block as coal gas is attached in the pipeline of equipment, it is therefore necessary to it will be in coal gas
Naphthalene cleaned up in primary cooler.
It is general at present that the naphthalene in primary cooler is cleaned using three recycling primary cooler sprinkling systems, as shown in Fig. 2, three times
Receive primary cooler sprinkling system use process be：Upper section sprinkling mixed liquor is derived from the middle part of 2 mixed liquor boundary layer of oil-water separation tank, oil
Tar ammonia volume ratio in the middle part of 2 mixed liquor boundary layer of water separating tank is about 4：6, it is delivered to by mixed liquor spray pump 7 just cold
The upper section of device 1 is sprayed, and upper section sprinkling mixed liquor flows automatically to upper section water seal, flowing full into upper section condensate liquid slot 4；Lower section sprinkling
Using self-circulation mode, lower section pump 5 extracts lower section sprinkling mixed liquor from lower section condensation liquid bath 3 and sprays to 1 lower section of primary cooler
It spills, for extra lower section sprinkling mixed liquor from lower section water seal, flowing full is flow into lower section condensation liquid bath 3, lower section condenses liquid bath 3 again
Flowing full to upper section condensate liquid slot 4, upper section condenses upper section condensate liquid extra in liquid bath 4 and is delivered to suction coal by upper section condensate pump 8
Before feed channel vapour liquid separator, tar ammonia separation system is reentered.It is existing three recycling primary cooler sprinkling system exist with
Lower deficiency：1, upper section sprays mixed liquor by the way of the oil-water mixture being directly derived from oil-water separation tank 2, and there are following several
Point drawback, firstly, the temperature of the mixed liquor in oil-water separation tank 2 is higher generally at 75 DEG C or so, and gas in upper segment is needed from 70
DEG C 40 DEG C are reduced to, 75 DEG C or so of upper section sprinkling mixed liquor is sprayed on primary cooler upper section heat exchanger tube, is increased on primary cooler
The heat exchange load of section heat exchanger tube；Secondly, the tar ammonia mixed liquor being directly derived from oil-water separation tank 2, maximum fountain height are general
It can only achieve 80m3/ h is not able to satisfy the sprinkler discharge density of upper section primary cooler, influences primary cooler upper section and washes naphthalene effect；Finally, due to
The mixed liquor in oil-water separation tank 2 is constantly extracted, the standing effect of oil-water separation tank 2 is influenced, in turn results in upper section sprinkling mixing
The tar-concentration fluctuation of liquid is big, influences primary cooler upper section and washes naphthalene effect.2, since the sprinkling of lower section mixed liquor uses self-circulation mode,
Lower section sprays mixed liquor content of naphthalene during recycling sprinkling and constantly increases, and naphthalene excessive concentration is easy crystallization and causes pipeline stifled
Plug causes primary cooler lower section to wash the reduction of naphthalene effect, increases primary cooler lower section resistance.
Utility model content
In order to solve the above problem, the purpose of the utility model is to provide a kind of sprinklings of coal gas primary cooler to wash naphthalene system, not only
Can be improved primary cooler washes naphthalene effect, and reduces the thermic load of heat exchanger tube in upper section primary cooler.
To achieve the above object, it includes that lower section sprays certainly that naphthalene system is washed in the sprinkling of coal gas primary cooler designed by the utility model
The circulatory system, the lower section sprinkling self-circulation system includes lower section condensation liquid bath and lower section pump, and the lower section condenses under liquid bath
Section condensate outlet is pumped through lower section by pipeline and is connect with the lower section flushing liquor import of primary cooler, under the lower section condensation liquid bath
Section condensate inlet is exported by the lower section flushing liquor of pipeline and primary cooler and is connected；It is characterized in that：It further includes upper section sprinkling
Self-circulation system and tar mixed liquor make-up system, the upper section sprinkling self-circulation system include upper section condensation liquid bath and upper section
Pump, the upper section condensate outlet of upper section condensation liquid bath are divided into two-way after upper section pumps, a-road-through piping and primary cooler
Upper section flushing liquor import connection, another way are sent outside by sending regulating valve outside to gas piping is inhaled, and the upper section condenses the upper of liquid bath
The first condensate inlet of section is exported by the upper section flushing liquor of pipeline and primary cooler and is connected；The tar mixed liquor make-up system packet
Oil-water separation tank is included, the liquid outlet of the oil-water separation tank is divided into two-way, the lower section of a-road-through piping and lower section condensation liquid bath
Tar mixed liquor feeds entrance connection, and another way feeds entrance by the upper section tar mixed liquor that pipeline and upper section condense liquid bath and connects
It connects；The flowing full outlet of the lower section condensation liquid bath is connect by pipeline with the second condensate inlet of upper section that upper section condenses liquid bath.
Preferably, the oil-water separation tank is located at the top of upper section condensation liquid bath and lower section condensation liquid bath.
Preferably, the liquid outlet of the oil-water separation tank be located at 0.2 below oil-water separation tank oil-water interfaces~
0.5m。
The utility model has the advantage of：It includes that lower section sprays certainly that naphthalene system is washed in the coal gas primary cooler sprinkling of the utility model
The circulatory system, upper section sprinkling self-circulation system and tar mixed liquor make-up system, lower section sprinkling self-circulation system are still continued to use existing
There are the lower section circulation spray modes of three recycling primary cooler sprinkling systems, the utility model recycles primary cooler sprinkling system for existing three
Upper section spray shine and be improved to upper section sprinkling self-circulation system, and newly-increased tar mixed liquor make-up system.The supply of tar mixed liquor
The sprinkling mixed liquor of system regular replenishment tar mixed liquor displacement high-concentration naphthalene into upper section condensate tank(trap) 4 and lower section condensation liquid bath 3,
The naphthalene for washing to get off originally is prevented to be sent into the problem of primary cooler causes resistance to rise again.And since upper section sprinkling is using self-loopa spray
Mode is spilt, upper section sprinkling mixed liquor is derived from upper section condensation liquid bath 4, on the one hand can increase upper section fountain height, and naphthalene effect is washed in enhancing；
The temperature of another aspect upper section sprinkling mixed liquor drops to 45-50 DEG C by original 75 DEG C, hence it is evident that reduces changing for upper section heat exchanger tube
Thermic load improves the cooling effect of coal gas.
Detailed description of the invention
Fig. 1 is that the schematic diagram of naphthalene system is washed in the coal gas primary cooler sprinkling of the utility model；
Fig. 2 is the schematic diagram of existing three recycling primary cooler sprinkling system；
Each part numbers are as follows in figure：Primary cooler 1, lower section flushing liquor import 1.1, lower section flushing liquor outlet 1.2, upper section spray
Spill liquid import 1.3, upper section flushing liquor outlet 1.4, oil-water separation tank 2, liquid outlet 2.1, lower section condensation liquid bath 3, lower section condensate liquid
Outlet 3.1, lower section condensate inlet 3.2, lower section tar mixed liquor supply entrance 3.3, flowing full outlet 3.4, upper section condense liquid bath
4, upper section condensate outlet 4.1, the first condensate inlet of upper section 4.2, upper section tar mixed liquor feed entrance 4.3, upper section second
Condensate inlet 4.4, upper section pump 6, mixed liquor spray pump 7, upper section condensate pump 8, sends regulating valve 9 outside at lower section pump 5.
Specific embodiment
To more fully understand the utility model, utility model is carried out specifically below with reference to drawings and concrete examples
It is bright.
For existing three recycling primary cooler sprinkling system during sprinkling, upper section sprinkling mixed liquor fountain height is small and upper section sprays
The problems such as tar-concentration fluctuation of mixed liquor is big and lower section sprays naphthalene excessive concentration in mixed liquor influences primary cooler and washes naphthalene effect,
And the heat exchange load of primary cooler upper section heat exchanger tube is big, influences the cooling effect of coal gas.To solve existing three recycling primary cooler spray
Spill there is a problem of washing in system the primary cooler upper section heat exchanger tube of the ineffective sum of naphthalene heat exchange load it is big, the utility model provide
Naphthalene system is washed in a kind of sprinkling of coal gas primary cooler, specifically, the coal gas primary cooler sprinkling of the utility model is washed under naphthalene system includes
Section sprinkling self-circulation system, upper section sprinkling self-circulation system and tar mixed liquor make-up system, the utility model coal gas primary cooler
The lower section sprinkling self-circulation system that naphthalene system is washed in sprinkling still continues to use the lower section circulation spray of existing three recycling primary cooler sprinkling system
Mode is spilt, the utility model, which shines the upper section spray of existing three recycling primary cooler sprinkling system, is improved to upper section sprinkling self-loopa system
System, and newly-increased tar mixed liquor make-up system.By tar mixed liquor make-up system to upper section condensate tank(trap) 4 and lower section condensate liquid
The sprinkling mixed liquor of regular replenishment tar mixed liquor displacement high-concentration naphthalene in slot 3 prevents the naphthalene for washing to get off originally to be sent into again just cold
The problem of device causes resistance to rise.Upper section sprinkling uses self-loopa spray modes, and upper section sprinkling mixed liquor is derived from upper section condensate liquid
Slot 4, on the one hand can increase upper section sprinkling flow, and naphthalene effect is washed in enhancing；Another aspect upper section sprays the temperature of mixed liquor by original
75 DEG C come drop to 45-50 DEG C, hence it is evident that the heat exchange load for reducing upper section heat exchanger tube improves the cooling effect of coal gas.Below
The preferred embodiment for washing naphthalene system by specific embodiment come the coal gas primary cooler sprinkling to the utility model is carried out in detail
Explanation.
Referring to Fig. 1, the utility model coal gas primary cooler sprinkling wash naphthalene system include lower section sprinkling self-circulation system, on
Section sprinkling self-circulation system and tar mixed liquor make-up system.
Lower section sprinkling self-circulation system includes lower section condensation liquid bath 3 and lower section pump 5, and lower section condenses the lower section condensation of liquid bath 3
Liquid outlet 3.1 is connect through lower section pump 5 with the lower section flushing liquor import 1.1 of primary cooler 1 by pipeline, and lower section condenses under liquid bath 3
Section condensate inlet 3.2 is connect by pipeline with the lower section flushing liquor of primary cooler 1 outlet 1.2.
Upper section sprinkling self-circulation system includes upper section condensation liquid bath 4 and upper section pump 6, and upper section condenses the upper section condensation of liquid bath 4
Liquid outlet 4.1 is divided into two-way after upper section pump 6, and a-road-through piping is connect with the upper section flushing liquor import 1.3 of primary cooler 1, separately
The suction gas piping to vapour liquid separator is sent outside by sending regulating valve 9 outside all the way, and the upper section first that upper section condenses liquid bath 4 condenses
Liquid entrance 4.2 is connect by pipeline with the upper section flushing liquor of primary cooler 1 outlet 1.4.
Tar mixed liquor make-up system includes oil-water separation tank 2, and the liquid outlet 2.1 of oil-water separation tank 2 divides for two-way, all the way
It feeds entrance 3.3 with the lower section tar mixed liquor that lower section condenses liquid bath 3 by pipeline to connect, another way is cold by pipeline and upper section
The upper section tar mixed liquor supply entrance 4.3 of condensate tank 3 connects；Lower section condense liquid bath 3 flowing full outlet 3.4 by pipeline with it is upper
The second condensate inlet of upper section 4.4 of Duan Lengning liquid bath 4 connects.Wherein, oil-water separation tank 2 is located at upper section condensation liquid bath 4 under
The top of Duan Lengning liquid bath 3, convenient for lower section condenses liquid bath 3 and upper section is cold from flowing to by the tar mixed liquor in oil-water separation tank 2
In condensate tank 4, the pump power transportation cost of reduction.And the liquid outlet 2.1 of oil-water separation tank 2 is located at 2 grease of oil-water separation tank
0.2~0.5m below interface, since the tar content of 2 interface of oil-water separation tank is 40% or so, the lower section of the utility model
Condensation liquid bath 3 and upper section condensation liquid bath 4 need to feed the tar mixed liquor of 10%-30%, therefore oil-water separation tank 2 is gone out liquid
0.2~0.5m are arranged below 2 oil-water interfaces of oil-water separation tank in mouth 2.1, extract tar light oil mixed liquor.
The coal gas primary cooler sprinkling of the utility model washes the operational process of naphthalene system and is：The sprinkling of primary cooler upper section uses to follow certainly
Ring mode, detailed process are that the coal gas of high temperature containing naphthalene initially enters the upper section of primary cooler 1, and upper section sprinkling mixed liquor is derived from upper section
Liquid bath 4 is condensed, is sprayed by the upper section of upper section pump 6 pump to primary cooler 1, sprinkling flow can reach 200m3/ h, upper section condensate liquid
The temperature of upper section sprinkling mixed liquor is 45~50 DEG C in slot 4, and tar content is 10~30%, and upper section sprinkling mixed liquor is sprayed onto just
1 upper section of cooler contacts washing with 75~80 DEG C of coal gas, and the naphthalene of coal gas is washed by upper section sprinkling mixed liquor in one side, separately
One side upper section sprays mixed liquor and coal gas carries out heat exchange, takes away the heat of a part of coal gas, it is cold to reduce 1 upper section of primary cooler
But the thermic load of pipe；Upper section sprinkling mixed liquor, which flows automatically to upper section water seal, flowing full, forms circulation sprinkling into upper section condensate liquid slot 4,
Since the content of naphthalene constantly increases upper section sprinkling mixed liquor during recycling sprinkling, naphthalene excessive concentration is easy crystallization and causes pipeline
Blocking is constantly fed the tar mixed liquor in oil-water separation tank 2 by the tar mixed liquor make-up system added cold to upper section
In condensate tank 4, so that upper section mixing flushing liquor is replaced, naphthalene excessive concentration Crystallization Plugging pipeline is prevented.
The sprinkling of primary cooler lower section also uses self-loopa mode, and detailed process is that lower section sprinkling mixed liquor is derived from lower section condensation
In liquid bath 3, sprayed by 5 pump of lower section pump to 1 lower section of primary cooler, extra lower section sprinkling mixed liquor from flow to lower section water seal,
Flowing full is into lower section condensation liquid bath 3, and lower section condenses liquid bath 3, and flowing full to upper section condensate liquid slot 4, upper section condenses more in liquid bath 4 again
Before remaining upper section condensate liquid is delivered to suction gas piping vapour liquid separator by upper section pump 6, tar ammonia separation system is reentered.
Since the content of naphthalene constantly increases lower section sprinkling mixed liquor during recycling sprinkling, naphthalene excessive concentration is easy crystallization and causes pipeline
Blocking, by add tar mixed liquor make-up system by the tar mixed liquor in oil-water separation tank 2 constantly feed give lower section condensation
In liquid bath 3, so that lower section mixing flushing liquor is replaced, naphthalene excessive concentration Crystallization Plugging pipeline is prevented.
A kind of embodiment of the utility model above described embodiment only expresses, the description thereof is more specific and detailed,
But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (3)
1. naphthalene system is washed in a kind of coal gas primary cooler sprinkling, including lower section sprays self-circulation system, and the lower section sprays self-loopa system
System includes lower section condensation liquid bath (3) and lower section pump (5), and the lower section condensate outlet (3.1) of lower section condensation liquid bath (3) passes through
Pipeline is connect through lower section pump (5) with the lower section flushing liquor import (1.1) of primary cooler (1), the lower section of lower section condensation liquid bath (3)
Condensate inlet (3.2) is connect by pipeline with the lower section flushing liquor of primary cooler (1) outlet (1.2)；It is characterized in that：It is also wrapped
Upper section sprinkling self-circulation system and tar mixed liquor make-up system are included, the upper section sprinkling self-circulation system includes upper section condensate liquid
The upper section condensate outlet (4.1) of slot (4) and upper section pump (6), upper section condensation liquid bath (4) is divided into two after upper section pumps (6)
Road, a-road-through piping are connect with the upper section flushing liquor import (1.3) of primary cooler (1), and another way is by sending regulating valve (9) outside outside
It send to gas piping is inhaled, the first condensate inlet of upper section (4.2) of upper section condensation liquid bath (4) passes through pipeline and primary cooler
(1) upper section flushing liquor outlet (1.4) connection；The tar mixed liquor make-up system includes oil-water separation tank (2), the grease
The liquid outlet (2.1) of separating tank (2) is divided into two-way, the lower section tar mixed liquor of a-road-through piping and lower section condensation liquid bath (3)
Entrance (3.3) connection is fed, another way feeds entrance by pipeline and the upper section tar mixed liquor of upper section condensation liquid bath (3)
(4.3) it connects；The flowing full outlet (3.4) of lower section condensation liquid bath (3) passes through pipeline and the upper section of upper section condensation liquid bath (4) the
Two condensate inlets (4.4) connection.
2. naphthalene system is washed in coal gas primary cooler sprinkling according to claim 1, it is characterised in that：The oil-water separation tank (2)
Positioned at the top of upper section condensation liquid bath (4) and lower section condensation liquid bath (3).
3. naphthalene system is washed in coal gas primary cooler sprinkling according to claim 1 or 2, it is characterised in that：The oil-water separation tank
(2) liquid outlet (2.1) is located at 0.2~0.5m below oil-water separation tank (2) oil-water interfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820299838.9U CN208136190U (en) | 2018-03-05 | 2018-03-05 | Naphthalene system is washed in coal gas primary cooler sprinkling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820299838.9U CN208136190U (en) | 2018-03-05 | 2018-03-05 | Naphthalene system is washed in coal gas primary cooler sprinkling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208136190U true CN208136190U (en) | 2018-11-23 |
Family
ID=64289058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820299838.9U Expired - Fee Related CN208136190U (en) | 2018-03-05 | 2018-03-05 | Naphthalene system is washed in coal gas primary cooler sprinkling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208136190U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110013731A (en) * | 2019-04-17 | 2019-07-16 | 唐钢美锦（唐山）煤化工有限公司 | A kind of coking exhaust gas processing device that zero-emission may be implemented and method |
| CN110906397A (en) * | 2019-11-07 | 2020-03-24 | 宁波方太厨具有限公司 | Oil cup for range hood and range hood applying same |
| CN114317039A (en) * | 2022-01-05 | 2022-04-12 | 新疆八一钢铁股份有限公司 | Condensate oil supplementing method for coking horizontal pipe primary cooler |
-
2018
- 2018-03-05 CN CN201820299838.9U patent/CN208136190U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110013731A (en) * | 2019-04-17 | 2019-07-16 | 唐钢美锦（唐山）煤化工有限公司 | A kind of coking exhaust gas processing device that zero-emission may be implemented and method |
| CN110906397A (en) * | 2019-11-07 | 2020-03-24 | 宁波方太厨具有限公司 | Oil cup for range hood and range hood applying same |
| CN110906397B (en) * | 2019-11-07 | 2021-11-26 | 宁波方太厨具有限公司 | Oil cup for range hood and range hood applying same |
| CN114317039A (en) * | 2022-01-05 | 2022-04-12 | 新疆八一钢铁股份有限公司 | Condensate oil supplementing method for coking horizontal pipe primary cooler |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
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| CF01 | Termination of patent right due to non-payment of annual fee |