CN212565732U - Energy-saving system for recycling main steam drainage - Google Patents
Energy-saving system for recycling main steam drainage Download PDFInfo
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- CN212565732U CN212565732U CN202020523067.4U CN202020523067U CN212565732U CN 212565732 U CN212565732 U CN 212565732U CN 202020523067 U CN202020523067 U CN 202020523067U CN 212565732 U CN212565732 U CN 212565732U
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Abstract
The utility model discloses an energy-saving system for recycling main steam drainage, which comprises a steam turbine, a low-pressure heater, a steam extraction pipeline communicated with the low-pressure heater and a deaerator; the steam turbine is communicated with a main steam pipeline component; a main steam valve of the steam turbine for controlling main steam to enter the steam turbine is arranged on the main steam pipeline component; the main steam pipeline assembly is arranged on a pipe body of the steam turbine before the main throttle valve enters steam, and is provided with a preheating pipeline assembly; the output end of the preheating pipeline assembly is arranged on a steam extraction pipeline of the low-pressure heater; the utility model discloses, be favorable to energy-concerving and environment-protective.
Description
Technical Field
The utility model relates to a steam turbine owner steam recycle technical field specifically is a hydrophobic recycle's of main steam economizer system.
Background
Thermal power unit is when starting the initial stage, the valve on steam turbine and the main steam connecting line is closed, steam has not been let in the steam turbine, steam just also can't enter into low pressure feed water heater through steam turbine and low pressure feed water heater connecting tube, lead to low pressure feed water heater on the temperature of thermal power unit start initial stage on the low side, the temperature of intaking that gets into the oxygen-eliminating device through low pressure feed water heater is on the low side, the start-up stove needs supply vapour to the oxygen-eliminating device all the time and heat this moment, the start-up process consumes a large amount of steam, increase start.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve lies in: when the thermal power generator is started, a large amount of energy of the starting furnace is consumed to supply steam for the deaerator to heat.
In order to solve the technical problem, the utility model provides a following technical scheme: an energy-saving system for recycling main steam drainage comprises a steam turbine, a low-pressure heater, a steam extraction pipeline communicated with the low-pressure heater and a deaerator; the steam turbine is communicated with a main steam pipeline component; a main steam valve of the steam turbine for controlling main steam to enter the steam turbine is arranged on the main steam pipeline component; the main steam pipeline assembly is arranged on a pipe body of the steam turbine before the main throttle valve enters steam, and is provided with a preheating pipeline assembly; and the output end of the preheating pipeline assembly is arranged on a steam extraction pipeline of the low-pressure heater.
In the initial starting stage of the thermal power generating set, in the cold and hot state washing stages of the thermal power generating set, main steam cannot reach the steam inlet condition of a steam turbine, at the moment, a main steam valve of the steam turbine is closed, the main steam is output to a steam extraction pipeline from the output end of a preheating pipeline component along a main steam pipeline component, then the main steam enters a low-pressure heater along the steam extraction pipeline, and critical drainage water from the low-pressure heater enters a condenser to provide heat for the low-pressure heater in the initial starting stage of the thermal power generating set; the temperature of the condensed water passing through the low-pressure heater is ensured to meet the required requirement, the preheating energy consumption of the starting furnace for heating the condensed water at the initial starting stage is saved, and the energy of the main steam is fully recycled at the initial starting stage of the thermal generator set, so that the energy-saving and environment-friendly effects are achieved.
Preferably, the main steam pipe assembly comprises a set of main steam pipes provided as a first main steam pipe; the device also comprises a condenser; a first condenser pipeline for outputting main steam to a first condenser is connected to a pipe body of the first main steam pipeline, which is positioned before the main throttle of the steam turbine enters steam; the preheating pipeline assembly comprises a first preheating pipeline; the first preheating pipeline is connected to a joint of the first condenser pipeline and the first main steam pipeline.
In the initial starting stage of the thermal power generating set, main steam is output to a steam extraction pipeline communicated with the output end of the first preheating pipeline from the first main steam pipeline along the first preheating pipeline, and then the main steam enters the low-pressure heater along the steam extraction pipeline to provide heat for the low-pressure heater in the initial starting stage of the thermal power generating set; the temperature of the condensed water passing through the low-pressure heater is guaranteed to meet the required requirements, preheating energy consumption of the starting furnace at the initial starting stage is saved, and the energy of the main steam is fully recycled at the initial starting stage of the thermal generator set, so that the energy-saving and environment-friendly effects are achieved.
Preferably, a first pneumatic regulating valve and a first manual stop valve are installed on the first preheating pipeline; the first pneumatic regulating valve and the first manual stop valve are sequentially arranged according to the air inlet direction of the main steam.
The opening and closing of the first preheating pipeline are controlled by additionally arranging a first pneumatic regulating valve and a first manual stop valve; when the steam preheating device is started at the initial stage, a first manual stop valve and a first pneumatic regulating valve are sequentially opened, and main steam enters a low-pressure heater along a first preheating pipeline to preheat the low-pressure heater; when the steam extraction of the steam turbine has formal input conditions, closing the first pneumatic regulating valve and the first manual stop valve in sequence; a first manual stop valve is arranged behind the first pneumatic regulating valve, so that the safety of the first preheating pipeline is ensured, and the first preheating pipeline cannot be closed when the first pneumatic regulating valve is damaged and maintained; and first manual stop valve is used for supplementary first pneumatic control valve, and first pneumatic control valve sets up before first manual stop valve for opening and shutting of the first preheating pipeline of master control to first pneumatic control valve bears the impact of most main steam, and the setting up of first manual stop valve adds a defence line for first preheating pipeline.
Preferably, the main steam pipeline assembly comprises two main steam pipelines, namely a second main steam pipeline and a third main steam pipeline; a second turbine main throttle valve and a third turbine main throttle valve which are used for controlling main steam to enter the steam turbine are respectively arranged on the second main steam pipeline and the third main steam pipeline; the preheating pipeline assembly comprises a second preheating pipeline, a third preheating pipeline and a preheating header pipe; the second main steam pipeline is connected with a second preheating pipeline on a pipe body of the second steam turbine before the main throttle valve enters steam; the third main steam pipeline is connected with a third preheating pipeline on a pipe body positioned before the main throttle valve of the third steam turbine enters steam; the output end of the second preheating pipeline and the output end of the third preheating pipeline are connected with a preheating main pipe; and the output end of the preheating header pipe is arranged on a steam extraction pipeline of the low-pressure heater.
The thermal power generating set is at the initial stage of starting, main steam does not reach the steam turbine admission requirement, first steam turbine main throttle and second steam turbine main throttle are closed, main steam enters into first preheating pipeline and second preheating pipeline along first main steam pipeline and second main steam pipeline respectively, then gather to preheat in the main pipe, and enter into the steam extraction pipeline from preheating the output of main pipe, again enter into the low pressure heater from the steam extraction pipeline, preheat the operation to the low pressure heater, make the condensate water temperature through the low pressure heater rise, reach the temperature requirement of deaerator, reduce the preheating energy consumption of start-up stove to the deaerator, and make full use of starts the heat of initial stage main steam, energy saving and environmental protection.
Preferably, a second condenser pipeline is connected to a pipe body of the second main steam pipeline, which is positioned at the steam inlet front end of a main throttle of the second turbine; the output end of the second condenser pipeline is connected with a second condenser; a third condenser pipeline is connected to a pipe body of the third main steam pipeline, which is positioned at the steam inlet front end of a main throttle of the third steam turbine; and the output end of the third condenser pipeline is connected with a third condenser.
Preferably, a second pneumatic regulating valve and a second manual stop valve are installed on the second preheating pipeline; and a third pneumatic regulating valve and a third manual stop valve are arranged on the third preheating pipeline.
The second pneumatic regulating valve and the second manual stop valve control the opening and closing of the second preheating pipeline; the third pneumatic regulating valve and the third manual stop valve control the opening and closing of the third preheating pipeline; the second preheating pipeline and the third preheating pipeline are respectively protected.
Preferably, the device further comprises an oxygen remover; the low-pressure heater is connected to the deaerator through a condensed water pipeline.
At the initial starting stage of the thermal generator set, main steam enters the low-pressure heater along the preheating pipeline assembly, and the condensed water passing through the low-pressure heater is preheated, so that the condensed water is ensured to meet the requirement of the deaerator for working.
Preferably, an extraction valve for controlling the opening and closing of the extraction pipeline is arranged on the extraction pipeline; and according to the steam inlet direction of the steam extraction pipeline, the steam extraction valve is arranged behind the connecting node of the preheating pipeline assembly and the steam extraction pipeline.
The steam extraction valve controls the opening and closing of the steam extraction pipeline and is used for protecting the steam extraction pipeline, and the output end of the preheating pipeline assembly is arranged between the steam extraction valve and the low-pressure heater, so that the condition that the preheating pipeline assembly cannot input main steam to the low-pressure heater due to the fact that the steam extraction valve is closed is prevented.
Preferably, a normal drain pipeline and a critical drain pipeline are welded on the low-pressure heater. The normal drainage of the low-pressure heater and the drainage in emergency are protected.
Compared with the prior art, the beneficial effects of the utility model are that:
A. the preheating pipeline assembly is arranged, the main steam pipeline assembly is directly communicated with the low-pressure heater, and the main steam provides heat for the low-pressure heater through the preheating pipeline assembly, so that the temperature of condensed water is increased, the water temperature is ensured to meet the required requirement, the heat of the main steam at the initial starting stage of the thermal power generating unit is fully utilized, the energy consumption of the starting furnace at the initial starting stage is saved, and the energy saving and environmental protection are facilitated;
B. the first manual stop valve and the first pneumatic regulating valve or the second pneumatic regulating valve, the second manual stop valve, the third pneumatic regulating valve and the third manual stop valve are arranged; and the protection effect on the second preheating pipeline and the third preheating pipeline is enhanced.
Drawings
FIG. 1 is a diagram of an energy saving system for recycling the main steam drain in the first embodiment of the present invention;
fig. 2 is a diagram of an energy saving system for recycling the main steam from the drainage system in the second embodiment of the present invention.
Detailed Description
In order to facilitate the understanding of the technical solutions of the present invention by those skilled in the art, the technical solutions of the present invention will now be further described with reference to the drawings attached to the specification.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Example one
Referring to fig. 1, the embodiment discloses an energy saving system for recycling main steam drainage, which includes a first condenser 2, a steam turbine 3, a low-pressure heater 4, a steam extraction pipeline 41 communicated with the low-pressure heater 4, and a deaerator 5. The steam turbine 3 is communicated with a first main steam pipeline 1 through a flange; and a main turbine valve 31 for controlling the main steam to enter the turbine 3 is provided on the first main steam line 1. A first condenser pipeline 21 for outputting main steam to a first condenser 2 is connected to a pipe body of the first main steam pipeline 1, which is positioned at the steam inlet front end of a main throttle valve 31 of the steam turbine, through a tee joint; and a first preheating pipeline 6 is connected to a joint of the first condenser pipeline 21 and the first main steam pipeline 1 through a tee joint. The output end of the first preheating pipeline 6 is arranged on the steam extraction pipeline 41 of the low-pressure heater 4 through a tee joint. The input of the extraction line 41 is connected to the turbine 3 (not shown). The low-pressure heater 4 is connected to the deaerator 5 through a condensed water pipe 51.
In the initial stage of starting the thermal power generating set, in the cold and hot state washing stages of the set, main steam cannot reach the steam inlet condition of the steam turbine, at the moment, a main throttle valve 31 of the steam turbine is closed, the main steam is blocked in front of the main throttle valve 31 of the steam turbine, and as the first preheating pipeline 6 is additionally arranged at the joint of the first condenser pipeline 21 and the main steam pipeline 1, the main steam is output to a steam extraction pipeline 41 communicated with the output end of the first preheating pipeline 6 along the first preheating pipeline 6, and then enters the low-pressure heater 4 along the steam extraction pipeline 41 to provide heat for the low-pressure heater 4 at the initial stage of starting the thermal power generating set; the temperature of the condensed water entering the deaerator 5 through the low-pressure heater 4 is guaranteed to reach the requirement required by the deaerator 5, preheating energy consumption of the deaerator 5 in the initial starting stage is saved, the energy of the main steam is fully recycled in the initial starting stage of the thermal generator set, and energy conservation and environmental protection are facilitated.
The first preheating pipeline 6 is provided with a pneumatic adjusting valve 61 and a manual stop valve 62 through bolts. The pneumatic control valve 61 and the manual cut-off valve 62 are sequentially arranged in accordance with the intake direction of the main steam.
The opening and closing of the first preheating pipeline 6 are controlled by additionally arranging a first pneumatic regulating valve 61 and a first manual stop valve 62; in the initial starting stage, a first manual stop valve 62 and a first pneumatic regulating valve 61 are sequentially opened, and a small amount of main steam enters the low-pressure heater 4 along the first preheating pipeline 6 to preheat the low-pressure heater 4; when the steam extraction of the steam turbine 3 meets the formal input condition, the first pneumatic regulating valve 61 and the first manual stop valve 62 are closed in sequence, so that the main steam is prevented from being shunted from the first preheating pipeline 6, and the steam quantity of the main steam entering the steam turbine 3 is reduced; a first manual stop valve 62 is arranged behind the first pneumatic regulating valve 61, so that the safety of the first preheating pipeline 6 is ensured, and the first preheating pipeline 6 cannot be closed when the first pneumatic regulating valve 61 is damaged and maintained; and first manual stop valve 62 is used for supplementary first pneumatic control valve 61, and first pneumatic control valve 61 sets up before first manual stop valve 62 for the opening and shutting of the first preheating pipeline 6 of main control, and first pneumatic control valve 61 bears the impact of most main steam, and the increase of first manual stop valve 62 adds a defence line for first preheating pipeline 6.
And an extraction valve 411 for controlling the opening and closing of the extraction pipeline 41 is mounted on the extraction pipeline 41 through a bolt. The steam extraction valve 411 is arranged behind the connection node of the first preheating pipe 6 and the steam extraction pipe 41 according to the steam inlet direction of the steam extraction pipe 41.
The steam extraction valve 411 controls the opening and closing of the steam extraction pipeline 41 and is used for protecting the steam extraction pipeline 41, and the output end of the first preheating pipeline 6 is arranged between the steam extraction valve 411 and the low-pressure heater 4, so that the condition that the first preheating pipeline 6 cannot input main steam to the low-pressure heater 4 due to the fact that the steam extraction valve 411 is closed is prevented.
And a normal drain pipeline 42 and a critical drain pipeline 43 are welded on the low-pressure heater 4.
The normal drainage of the low-pressure heater 4 and the drainage in emergency are protected.
The working principle is as follows: at the initial stage of starting the thermal power generating set, main steam does not reach the steam inlet condition of the steam turbine 3, at the moment, the main throttle 31 of the steam turbine is closed, and the main steam is blocked at the main throttle 31 of the steam turbine, because the first preheating pipeline 6 is additionally arranged at the joint of the first condenser pipeline 21 and the main steam pipeline 1, and the first manual stop valve 62 and the first pneumatic regulating valve 61 on the first preheating pipeline 6 are sequentially opened, the main steam advances along the first preheating pipeline 6 and is output to the steam extraction pipeline 41 communicated with the output end of the first preheating pipeline 6, in order to prevent the main steam from overflowing from the steam inlet end of the steam extraction pipeline 41, the steam extraction valve 411 is closed, and then the main steam enters the low-pressure heater 4 along the steam extraction pipeline 41, so as to provide heat for the low-pressure heater 4 at the initial stage of starting the thermal power generating set; the temperature of the condensed water entering the deaerator 5 through the low-pressure heater 4 is guaranteed to meet the requirement required by the deaerator 5, preheating energy consumption of the deaerator 5 in the initial starting stage of a starting furnace is saved, energy of main steam is fully recycled in the initial starting stage of the thermal generator set, and energy conservation and environmental protection are facilitated; after the initial start of the thermal generator set is passed, when the steam turbine 3 normally operates, the first pneumatic regulating valve 61 and the first manual stop valve 62 on the first preheating pipeline 6 are sequentially closed, main steam enters the steam turbine 3, enters the steam extraction pipeline 41 through the pipeline after the steam turbine 3 operates, enters the low-pressure heater 4 through the steam extraction valve 411, and raises the temperature of condensed water passing through the low-pressure heater 4, so that the requirement of the deaerator 5 on the water temperature is ensured; the energy consumption for heating the deaerator 5 by using the starting furnace in the whole process is greatly reduced, and the energy-saving and environment-friendly effects are facilitated.
Example two
Referring to fig. 2, unlike the first embodiment, the steam turbine 3 is connected to two main steam pipelines, namely, a first main steam pipeline 1a and a second main steam pipeline 1b, through flanges. The first main steam pipeline 1a and the second main steam pipeline 1b are respectively provided with a first turbine main throttle valve 31a and a second turbine main throttle valve 31b for controlling main steam to enter the steam turbine 3. The first main steam pipeline 1a is connected with a first condenser pipeline 21a through a tee joint on a pipe body positioned at the steam inlet front end of a first turbine main throttle valve 31 a. The output end of the first condenser pipeline 21a is connected with a first condenser 2 a. And a second condenser pipeline 21b is connected to a pipe body of the second main steam pipeline 1b, which is positioned at the steam inlet front end of the second steam turbine main throttle valve 31b, through a tee joint. The output end of the second condenser pipeline 21b is connected with a second condenser 2 b. And a second preheating pipeline 6a is connected to a joint of the first condenser pipeline 21a and the first main steam pipeline 1a through a tee joint. And a third preheating pipeline 6b is connected to a joint of the second condenser pipeline 21b and the second main steam pipeline 1b through a tee joint. The output end of the second preheating pipeline 6a and the output end of the third preheating pipeline 6b are connected with a preheating header pipe 7 through a tee joint; and the output end of the preheating header pipe 7 is installed on the steam extraction pipeline 41 of the low-pressure heater 4 through a tee joint.
In the initial starting stage of the thermal power generating set, during the cold and hot state flushing stages of the thermal power generating set, main steam cannot meet the steam turbine steam inlet requirement, the first steam turbine main steam valve 31a and the second steam turbine main steam valve 31b are closed, main steam quantity respectively enters the second preheating pipeline 6a and the third preheating pipeline 6b along the first main steam pipeline 1a and the second main steam pipeline 1b, then is collected into the preheating header pipe 7, enters the steam extraction pipeline 41 from the output end of the preheating header pipe 7, then enters the low-pressure heater 4 from the steam extraction pipeline 41, and preheats the low-pressure heater 4, so that the temperature of condensed water passing through the low-pressure heater 4 is increased, the water temperature requirement of the deaerator 5 is met, the preheating energy consumption of the deaerator 5 by a starting furnace is reduced, the heat of the main steam in the initial starting stage is fully utilized, and the energy conservation and environmental protection are realized.
A second pneumatic control valve 61a and a second manual stop valve 62a are mounted on the second preheating pipeline 6 a. The third preheating pipeline 6b is provided with a third pneumatic regulating valve 61b and a third manual stop valve 62 b.
The second pneumatic regulating valve 61a and the second manual stop valve 62a control the opening and closing of the second preheating pipeline 6 a; the third pneumatic regulating valve 61b and the third manual stop valve 62b control the opening and closing of the third preheating pipeline 6 b; and respectively play a role in protecting the second preheating circuit 6a and the third preheating circuit 6 b.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The above embodiments only show the embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and for those skilled in the art, a plurality of modifications and improvements can be made without departing from the concept of the present invention, and these modifications and improvements all belong to the protection scope of the present invention.
Claims (9)
1. The utility model provides a hydrophobic recycle's of main steam economizer system which characterized in that: comprises a steam turbine, a low-pressure heater, a steam extraction pipeline communicated with the low-pressure heater and a deaerator; the steam turbine is communicated with a main steam pipeline component; a main steam valve of the steam turbine for controlling main steam to enter the steam turbine is arranged on the main steam pipeline component; the main steam pipeline assembly is arranged on a pipe body of the steam turbine before the main throttle valve enters steam, and is provided with a preheating pipeline assembly; and the output end of the preheating pipeline assembly is arranged on a steam extraction pipeline of the low-pressure heater.
2. The energy-saving system for hydrophobic recycling of main steam as claimed in claim 1, wherein: the main steam pipeline assembly comprises a group of main steam pipelines which are set as first main steam pipelines; the device also comprises a condenser; a first condenser pipeline for outputting main steam to a first condenser is connected to a pipe body of the first main steam pipeline, which is positioned before the main throttle of the steam turbine enters steam; the preheating pipeline assembly comprises a first preheating pipeline; the first preheating pipeline is connected to a joint of the first condenser pipeline and the first main steam pipeline.
3. The energy-saving system for hydrophobic recycling of main steam as claimed in claim 2, wherein: a first pneumatic regulating valve and a first manual stop valve are arranged on the first preheating pipeline; the first pneumatic regulating valve and the first manual stop valve are sequentially arranged according to the air inlet direction of the main steam.
4. The energy-saving system for hydrophobic recycling of main steam as claimed in claim 1, wherein: the main steam pipeline assembly comprises two main steam pipelines which are respectively a second main steam pipeline and a third main steam pipeline; a second turbine main throttle valve and a third turbine main throttle valve which are used for controlling main steam to enter the steam turbine are respectively arranged on the second main steam pipeline and the third main steam pipeline; the preheating pipeline assembly comprises a second preheating pipeline, a third preheating pipeline and a preheating header pipe; the second main steam pipeline is connected with a second preheating pipeline on a pipe body of the second steam turbine before the main throttle valve enters steam; the third main steam pipeline is connected with a third preheating pipeline on a pipe body positioned before the main throttle valve of the third steam turbine enters steam; the output end of the second preheating pipeline and the output end of the third preheating pipeline are connected with a preheating main pipe; and the output end of the preheating header pipe is arranged on a steam extraction pipeline of the low-pressure heater.
5. The energy-saving system for hydrophobic recycling of main steam as claimed in claim 4, wherein: the second main steam pipeline is connected with a second condenser pipeline on a pipe body positioned at the steam inlet front end of a main throttle of a second steam turbine; the output end of the second condenser pipeline is connected with a second condenser; a third condenser pipeline is connected to a pipe body of the third main steam pipeline, which is positioned at the steam inlet front end of a main throttle of the third steam turbine; and the output end of the third condenser pipeline is connected with a third condenser.
6. The energy-saving system for hydrophobic recycling of main steam as claimed in claim 4, wherein: a second pneumatic regulating valve and a second manual stop valve are arranged on the second preheating pipeline; and a third pneumatic regulating valve and a third manual stop valve are arranged on the third preheating pipeline.
7. The energy-saving system for hydrophobic recycling of main steam as claimed in claim 1, wherein: the device also comprises a deaerator; the low-pressure heater is connected to the deaerator through a condensed water pipeline.
8. The energy-saving system for hydrophobic recycling of main steam as claimed in claim 1, wherein: the steam extraction pipeline is provided with a steam extraction valve for controlling the opening and closing of the steam extraction pipeline; and according to the steam inlet direction of the steam extraction pipeline, the steam extraction valve is arranged behind the connecting node of the preheating pipeline assembly and the steam extraction pipeline.
9. The energy-saving system for hydrophobic recycling of main steam as claimed in claim 1, wherein: and the low-pressure heater is also welded with a normal drain pipeline and an emergency drain pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020523067.4U CN212565732U (en) | 2020-04-10 | 2020-04-10 | Energy-saving system for recycling main steam drainage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020523067.4U CN212565732U (en) | 2020-04-10 | 2020-04-10 | Energy-saving system for recycling main steam drainage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212565732U true CN212565732U (en) | 2021-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020523067.4U Expired - Fee Related CN212565732U (en) | 2020-04-10 | 2020-04-10 | Energy-saving system for recycling main steam drainage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212565732U (en) |
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2020
- 2020-04-10 CN CN202020523067.4U patent/CN212565732U/en not_active Expired - Fee Related
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