CN210004376U - series double-valve steam blowpipe structure of utility boiler - Google Patents
series double-valve steam blowpipe structure of utility boiler Download PDFInfo
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- CN210004376U CN210004376U CN201920785077.2U CN201920785077U CN210004376U CN 210004376 U CN210004376 U CN 210004376U CN 201920785077 U CN201920785077 U CN 201920785077U CN 210004376 U CN210004376 U CN 210004376U
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Abstract
The utility model discloses an power plant boiler series connection bivalve steam blowpipe structure, including superheater entry collection case, superheater tube bank, superheater export collection case, high pressure main vapour , reserve face blow the valve, official face blows the valve, the grain collector, reheater entry collection case, the reheater tube bank, reheater export collection case, medium pressure main vapour and evacuation pipeline, superheater entry collection case is linked together through the entry of superheater tube bank with superheater export collection case, the export of superheater export collection case is in proper order through high pressure main vapour , reserve face blows the valve, official face blow valve and grain collector and the entry of reheater entry collection case and be linked together, the export of reheater entry collection case is linked together through the entry of reheater with reheater export collection case, the export of reheater export collection case is linked together through medium pressure main vapour and evacuation pipeline, be provided with the target plate ware on the evacuation pipeline, the effect of this structure sweeps, the reliability is higher, and steam leakage risk is lower.
Description
Technical Field
The utility model belongs to thermal power generation engineering capital construction debugging field relates to kinds of power plant boiler series connection bivalve steam blowpipe structure.
Background
After production, manufacturing, transportation, installation and even chemical cleaning of the new boiler, welding slag, oxide skin, scrap iron and other impurities are inevitably left in the superheater, the reheater and the steam pipeline, and if the impurities are not effectively cleaned, serious consequences such as pipe blockage of the heating surface of the boiler, overtemperature pipe explosion, foreign body impact on and damage to a preceding stage blade of a steam turbine and the like can be caused.
The boiler steam blowpipe is that high-temperature high-pressure steam that utilizes boiler ignition to produce certainly carries out large-traffic to the over heater, reheater system and subsidiary pipeline and sweeps to blow out impurity such as welding slag iron fillings outside the boiler system, guarantee the follow-up safety that starts of unit, when actually sweeping, in order to avoid the steam that contains impurity to get into the steam turbine, need block up high-pressure main steam and medium-pressure main steam of steam turbine with false valve core, reuse interim pipeline, the exhaust steam pipe of bypass connection to the high-pressure cylinder, sweep steam and finally get into the reheater cold-section pipeline.
Taking an energy storage depressurization method blow pipe process as an example, the blow pipe process is described as follows: after the boiler is ignited, the fuel is gradually added, the temperature and the pressure are raised, when the steam parameters at the steam-water separator reach 6.5-7.5MPa/275 ℃ -295 ℃, the blow valve is opened, the accumulated high-temperature high-pressure steam rapidly rushes into the pipeline and the heated surface pipe, carries impurities and is finally discharged into the atmosphere.
A conventional parallel double-valve steam purging structure is shown in figure 2, after isolation measures are taken by high-pressure main steam of a steam turbine, two temporary pipelines are connected, and each temporary pipeline is respectively connected with blow-on valves.
In practical application, the parallel double-valve type blow pipe structure has the following defects:
1. the two valves cannot be opened fully at the same time, the blowing effect cannot be maximized, the ideal state of the blowing pipe is that the blow valve reaches the fully opened state, the through-flow capacity of the pipeline reaches the maximum, and the higher the pressure of the steam at the moment, the better the blowing effect, the actual situation is that the opening and closing time is different due to the two valves connected in parallel, 1 valve can be opened fully firstly during blowing, and another valves are still in the opening process, when the 2 nd valve also reaches the fully opened state, the steam pressure is reduced by part, the blowing quality is naturally reduced, and the blowing effect cannot reach the maximum.
2. The parallel connection of the 2 valves is required to ensure normal operation, and the blow pipe operation cannot be continued as long as 1 valve fails, in the practical process, the problem of single-side adjacent blow valve failure often occurs, because the main steam pipeline is divided into 2 paths, if only 1 adjacent blow valve is normal, the path pipeline where the failure valve is located cannot be blown, therefore, the blow pipe structure in the form of the parallel connection double valve is low in operation reliability.
3. The risk of steam leakage is high, personnel's security is low when changing the target plate, when changing the afterbody target plate, rely on the anterior blow valve to do safety isolation, avoid high temperature high pressure steam to leak and cause personnel's injury, blow the valve in the blowpipe in-process, will switch many times repeatedly, receive high temperature high pressure steam and frequently erode, the condition that closes not in place appears very easily, parallelly connected 2 valves , as long as have 1 valve to close untight, will leak high temperature high pressure steam, bring huge security threat to the personnel of changing the target plate at the back.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide kinds of power boiler series connection bivalve steam blowpipe structures, the effect that sweeps of this structure, the reliability is higher to steam leakage risk is lower.
In order to achieve the above purpose, the utility model discloses a power plant boiler series connection bivalve steam blowpipe structure includes superheater entrance collection case, superheater tube bank, superheater export collection case, high pressure main steam , reserve face blow valve, official face blow valve, particle collector, reheater entrance collection case, reheater tube bank, reheater export collection case, medium pressure main steam and evacuation pipeline;
the superheater inlet header is communicated with an inlet of a superheater outlet header through a superheater tube bundle, an outlet of the superheater outlet header is communicated with an inlet of a reheater inlet header through a reheater tube bundle in sequence, a high-pressure main steam , a standby blow valve, a formal blow valve and a particle collector are communicated with the inlet of the reheater inlet header, an outlet of the reheater inlet header is communicated with an inlet of the reheater outlet header through the reheater tube bundle, an outlet of the reheater outlet header is communicated with an evacuation pipeline through a medium-pressure main steam , and a target plate device is arranged on the evacuation pipeline.
The superheater outlet header is communicated with the high-pressure main steam through a main steam pipe.
The particle collector is communicated with the reheater inlet header through a reheater cold section pipe.
The reheater outlet header is communicated with the medium-pressure main steam through a reheater hot section pipe.
The emptying pipeline is provided with a silencer.
The number of the high-pressure main steam is two, and the two high-pressure main steam are communicated in parallel.
The utility model discloses following beneficial effect has:
station boiler series connection bivalve steam blowpipe structure including reserve blow valve and formal blow valve that faces, reserve blow valve and formal face blow valve series connection intercommunication that faces, is equipped with and uses, when carrying out the blowpipe, then with wherein face blow the valve and open completely, when steam reaches the requirement parameter, then face in addition blow the valve and open, in order to realize the blowpipe, the blowpipe quality is higher, in addition, when wherein face blow the valve when breaking down, then open its manual fully, then utilize face blow the valve in addition and carry out the blowpipe work, the reliability is higher, simultaneously when changing the target plate, as long as reserve face blow valve and formal face in blowing the valve and normally close, can realize the shutoff of whole pipeline, steam leakage's risk is lower, staff's personal safety factor when changing the target plate has improved greatly.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of a conventional parallel double valve type steam blowpipe structure.
Wherein, 1 is a superheater inlet header, 2 is a superheater outlet header, 3 is high-pressure main steam , 4 is a standby blow valve, 5 is a formal blow valve, 6 is a grain collector, 7 is a reheater inlet header, 8 is a reheater outlet header, 9 is medium-pressure main steam , 10 is a target plate device, and 11 is a silencer.
Detailed Description
The present invention will be described in further detail at with reference to the accompanying drawings:
referring to fig. 1, the utility model discloses a power plant boiler series connection bivalve steam blowpipe structure include superheater entry collection case 1, superheater tube bank, superheater export collection case 2, high pressure main steam 3, reserve face blow valve 4, formal face blow valve 5, particle collector 6, reheater entry collection case 7, reheater tube bank, reheater export collection case 8, medium pressure main steam 9 and evacuation pipeline, superheater entry collection case 1 is linked together through the entry of superheater exit collection case 2, the export of superheater exit collection case 2 is linked together with the entry of reheater entry collection case 7 through high pressure main steam 3, reserve face blow valve 4, formal face blow valve 5 and particle collector 6 in proper order, the export of reheater entry collection case 7 is linked together through the entry of reheater exit collection case 8 through medium pressure main steam 9, the export of reheater exit collection case 8 is linked together with the evacuation pipeline through medium pressure main steam , be provided with target plate 10 on the evacuation pipeline.
The superheater outlet header 2 is communicated with the high-pressure main steam 3 through a main steam pipe, the grain collector 6 is communicated with the reheater inlet header 7 through a reheater cold section pipe, the reheater outlet header 8 is communicated with the medium-pressure main steam 9 through a reheater hot section pipe, a silencer 11 is arranged on an emptying pipeline, the number of the high-pressure main steam 3 is two, and the two high-pressure main steam 3 are communicated in parallel.
The target plate device 10 is mainly used for checking the purging quality, if the pipeline is not purged completely, impurities can be contained in steam, high-temperature and high-pressure steam carries impurity particles to impact the target plate and can form pits and spots, and on the contrary, when the surface of the target plate is still clean as new, the pipeline is blown completely.
The silencer 11 mainly reduces the decibel value of the noise generated when the high-pressure steam is exhausted, and avoids the noise exceeding standard from disturbing residents.
The utility model discloses a concrete working process does:
steam generated at the outlet of the water wall enters the superheater inlet header 1, the steam continuously absorbs heat in the superheater tube bundle to become superheated steam with higher temperature, the superheated steam is discharged into a main steam pipeline from the superheater outlet header 2, then the superheated steam is blocked by the standby blow-by valve 4 and the formal blow-by valve 5 through a temporary pipeline by high-pressure main steam 3, and the steam blocked by the formal blow-by valve 5 is continuously heated and pressurized along with the continuous combustion of the boiler to gradually reach the required parameter of 7.5MPa/290 ℃.
When a single-valve blow pipe is used, namely only the formal blow valve 5 is used for controlling the blow pipe, the standby blow valve 4 is kept in a fully open state all the time in the whole process of the blow pipe under normal conditions and only serves as a through-flow component, the standby blow valve 4 is fully opened when the blow pipe is prepared, and the formal blow valve 5 is in a fully closed state, when the blow pipe is started, the formal blow valve 5 is fully opened after receiving an instruction, high-temperature and high-pressure steam accumulated before is flushed into the grain collector 6 at the fastest speed and then enters the reheater inlet header 7 and the reheater outlet header 8 through the reheater cold section pipe, and the steam after the reheater pipe is flushed enters the medium-pressure main steam 9 through the reheater hot section pipe and then is exhausted into the atmosphere through the target plate 10 and the silencer 11 through the exhaust pipe.
During the blowpipe, of standby blow valve 4 and formal blow valve 5 are used for control, as long as this blow valve reaches the full open state, the full pipeline has just reached the maximum through-flow capacity operating mode, steam pressure temperature is in higher state this moment, steam has powerful kinetic energy, the effect of sweeping can reach the maximize, when connecting in parallel, blow valve among them opens totally, wait that the second blow valve opens totally, full pipeline flow capacity can reach the biggest, steam pressure has been let out part by the blow valve, the effect of sweeping is certainly weaker.
The utility model discloses the reserve of establishing ties faces to blow valve 4 and official facing to blow valve 5 and each other for reserve, when wherein face when blowing out the trouble in the valve, do not need the valve that blows of maintaining at once, only need with the manual compulsory opening to full open state of the valve that blows that faces of this trouble, face in addition and blow the valve and continue to carry out blowpipe work, valve damages when having solved parallelly connected bivalve , the unable shortcoming that continues of blowpipe work, when having avoided also maintaining valve under high temperature high pressure, the big problem of personal safety risk.
When the target shooting inspection is needed, for effectively cutting off steam, the standby blow valve 4 and the formal blow valve 5 are completely closed, the serial double blow valves are isolated for two , double protection is achieved, the safety of workers who replace the target plate at the back can be guaranteed as long as blow valves are tightly closed in the two blow valves, and therefore the safety of the workers when replacing the target plate is greatly improved.
Claims (6)
- The power station boiler series double-valve steam blowpipe structure is characterized by comprising a superheater inlet header (1), a superheater tube bundle, a superheater outlet header (2), high-pressure main steam (3), a standby blow valve (4), a formal blow valve (5), a particle collector (6), a reheater inlet header (7), a reheater tube bundle, a reheater outlet header (8), medium-pressure main steam (9) and an emptying pipeline;the superheater inlet header (1) is communicated with an inlet of a superheater outlet header (2) through a heater tube bundle, an outlet of the superheater outlet header (2) is communicated with an inlet of a reheater inlet header (7) through high-pressure main steam (3), a standby blow valve (4), a formal blow valve (5) and a particle collector (6) in sequence, an outlet of the reheater inlet header (7) is communicated with an inlet of a reheater outlet header (8) through the reheater tube bundle, an outlet of the reheater outlet header (8) is communicated with an emptying pipeline through medium-pressure main steam (9), and a target plate device (10) is arranged on the emptying pipeline.
- 2. The utility boiler series double valve steam blowpipe structure of claim 1, characterized in that, the superheater outlet header (2) and the high pressure main steam (3) are communicated with each other through a main steam pipe.
- 3. The utility boiler series double valve steam blowpipe configuration of claim 1, characterized in that, the collector (6) and reheater inlet header (7) are in communication via a reheater cold leg pipe.
- 4. The utility boiler series double valve steam blowpipe arrangement of claim 1, characterized in that reheater outlet header (8) is in communication with intermediate pressure main steam (9) via reheater hot leg piping.
- 5. The utility boiler series double valve steam blowpipe structure of claim 1, characterized in that, a silencer (11) is provided on the evacuation pipe.
- 6. The utility boiler series double valve steam blowpipe structure of claim 1, wherein the number of the high pressure main steam (3) is two, and the two high pressure main steam (3) are connected in parallel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920785077.2U CN210004376U (en) | 2019-05-28 | 2019-05-28 | series double-valve steam blowpipe structure of utility boiler |
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| CN201920785077.2U CN210004376U (en) | 2019-05-28 | 2019-05-28 | series double-valve steam blowpipe structure of utility boiler |
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| CN210004376U true CN210004376U (en) | 2020-01-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203315A (en) * | 2021-04-07 | 2021-08-03 | 机械工业第九设计研究院有限公司 | Residual steam clearing device in steam engine pipeline |
| CN114247710A (en) * | 2021-12-21 | 2022-03-29 | 华能山东石岛湾核电有限公司 | Purging system and purging method for main steam pipeline of nuclear power station |
-
2019
- 2019-05-28 CN CN201920785077.2U patent/CN210004376U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203315A (en) * | 2021-04-07 | 2021-08-03 | 机械工业第九设计研究院有限公司 | Residual steam clearing device in steam engine pipeline |
| CN114247710A (en) * | 2021-12-21 | 2022-03-29 | 华能山东石岛湾核电有限公司 | Purging system and purging method for main steam pipeline of nuclear power station |
| CN114247710B (en) * | 2021-12-21 | 2022-10-21 | 华能山东石岛湾核电有限公司 | Purging system and purging method for main steam pipeline of nuclear power station |
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