CN215174953U - Ultra-supercritical 1000 MW-level boiler depressurization blow pipe system - Google Patents

Abstract

The utility model provides an ultra supercritical 1000MW boiler decompression blowpipe system. The blowpipe system comprises a superheater, a high-pressure main steam valve, a reheating cooling pipeline, a reheater, a medium-pressure main steam valve and an emptying temporary pipe, wherein an inlet of the superheater is communicated with a steam-water separator, an outlet of the superheater is communicated with the high-pressure main steam valve through a main steam pipe, the high-pressure main steam valve is communicated with the reheating cooling pipeline through a temporary pipeline, a blowing valve is arranged on the temporary pipeline, an outlet of the reheating cooling pipeline is communicated with an inlet of the reheater, a high-efficiency particle collector is arranged on the reheating cooling pipeline, the reheater is communicated with the emptying temporary pipe through the medium-pressure main steam valve, and a target plate device for quickly replacing a target plate and a silencer are sequentially arranged on the emptying temporary pipe; the blowing door is opened quickly by adopting electric direct drive. The utility model discloses the configuration system is succinct, the pressure loss is little, and system's stress is little, and the thermal energy is reasonable, can make the blowpipe cycle reduce by a wide margin, saves a large amount of fuel and demineralized water, and the process environmental protection is high-efficient.

Description

Ultra-supercritical 1000 MW-level boiler depressurization blow pipe system

Technical Field

The utility model belongs to thermal power factory boiler steam blowpipe field specifically is an ultra supercritical 1000MW level boiler step-down blows system.

Background

With the high development of national industry, the demand of electric power is larger and higher, and therefore, the thermal power plant plays an increasingly important role in the overshoot of the high development of national economy. As one of the most important equipments in the thermal power plant, the generation of the boiler and its accessories is also getting faster and faster. The ultra-supercritical once-through boiler with high parameter and large capacity has the economic advantages of high power generation and low coal consumption, and becomes the most popular boiler type which is developed most rapidly in recent years.

Because sand grains, iron scales, scrap iron, welding slag and chemical cleaning substances which are not washed away remain in the superheater, the reheater system and the steam pipeline to different degrees in the newly installed unit due to the aspects of manufacturing, installation, storage, transportation and the like, the substances exist in the heated surface to cause pipe blockage, pipe explosion and high-temperature corrosion of the heated surface or are brought into a steam turbine to endanger the safe operation of the steam turbine generator unit, and therefore the cleaning degree of the water cooling wall, the superheater, the reheater and the steam pipeline in the heated surface of the newly-built supercritical 1000 MW-level boiler has great relation to the safe and economic operation of the unit and the smooth operation of the unit.

In order to remove impurities and generated corrosion accumulated in the pipes in the manufacturing, transporting, storing and installing processes, a superheater, a reheater and a steam pipeline of a boiler are subjected to steam purging, so that damage to the superheater, the reheater and a steam turbine through-flow part in the operation of a unit is prevented, the safety and the economical efficiency of the unit are improved, and the steam quality during the operation is improved. In the past, a newly-built unit mostly adopts a pressure reduction blowing pipe mode, the blowing pipe effect is poor, impurities in a superheater pipe possibly rush to a reheater pipe in the blowing pipe process to form secondary pollution, and the blowing pipe period is prolonged. In addition, current steam blowpipe requires to be equipped with the target plate respectively at superheater export and reheater export, needs to install and change the target plate during the steam blowpipe, and target plate is fixed among the current blowpipe system, and its target plate replacement work is complicated, has increased working strength and danger that the staff changed the target plate in high temperature high pressure steam region.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides an ultra supercritical 1000MW level boiler step-down blowpipe system, this system body can reduce the blowpipe cycle by a wide margin, saves a large amount of fuel and demineralized water, and the process environmental protection is high-efficient and fall the noise.

In order to solve the technical problem, the utility model provides an ultra supercritical 1000MW level boiler step-down blowpipe system, the blowpipe system includes over heater, high-pressure main steam valve, reheat cooling pipeline, reheater, medium pressure main steam valve and evacuation temporary pipe, the import and the catch water intercommunication of over heater, the export of over heater through main steam pipe and high-pressure main steam valve intercommunication, high-pressure main steam valve and reheat cooling pipeline intercommunication through temporary pipeline, be equipped with the blow door on temporary pipeline, the export of reheat cooling pipeline and the import of reheater communicate, be equipped with high-efficient particle collector on reheat cooling pipeline, the reheater passes through medium pressure main steam valve and evacuation temporary pipe intercommunication, be equipped with target plate device and the silencer of quick replacement target plate on evacuation temporary pipe in proper order; the blowing door is opened quickly by adopting an electric direct-drive mode; the efficient particle collector comprises an outer barrel with two open ends and a porous pipe with one open end and the other end provided with a conical plugging plate, the porous pipe is arranged in the outer barrel, the outer wall of the tail end of the porous pipe is plugged with the outer barrel through the plugging plate and is fixedly connected with the outer barrel through the plugging plate, and a dirt collecting box is arranged in the outer barrel corresponding to the perforated pipe opening area; the opening tail end of a perforated pipe of the high-efficiency particle collector is communicated with the reheating cooling pipeline, and the other end of the perforated pipe is connected with the reheater through an outer barrel.

The utility model discloses further technical scheme: the high-pressure main steam valves and the medium-pressure main steam valves are respectively provided with two, the two high-pressure main steam valves are connected in parallel and then connected with a temporary pipeline, and two ends of the two medium-pressure main steam valves are respectively communicated with the reheater and the emptying temporary pipe after being connected in parallel.

The utility model discloses better technical scheme: the high-efficient particle collector is equipped with two, and reheat cooling line falls into two branch pipes with the link of reheater, and two high-efficient particle collectors set up respectively on two branch pipes.

The utility model discloses better technical scheme: the target plate device capable of rapidly replacing the target plate comprises a target plate shaft and a target plate, wherein the target plate shaft and the target plate are arranged on an emptying temporary pipe, the target plate shaft is inserted from one side of the emptying temporary pipe and penetrates through the emptying temporary pipe, the target shaft of the other side is embedded into a target shaft bracket of the other side, the inserting port of the target plate shaft is sealed through a sealing device, the sealing device comprises a flange sleeve, a flange cover, a door-shaped top frame and a jack, the target shaft handle of the target plate shaft is arranged between the flange sleeve and the flange cover and is fixedly locked through a fixing bolt, a target plate inserting groove is formed in the target plate shaft, the target plate inserting groove is 45-degree dovetail grooves, inserting blocks matched with the target plate are arranged on two sides of the target plate, and the inserting blocks can be matched with the dovetail grooves in the target plate shaft. The door-shaped top frame is erected above the flange sleeve, and two ends of the door-shaped top frame are connected with the emptying temporary pipe through pin bolts and rotate within the range of 180 degrees under the loosening state of the pin bolts; the jack is arranged on the flange cover, the other end of the jack is connected with the door-shaped top frame which rotates to be vertical to the target plate shaft in a jacking mode, and the jack jacks the flange cover tightly under the counter-acting force of the door-shaped top frame for sealing.

The utility model discloses better technical scheme: the lower part of the sewage collecting box of the high-efficiency particle collector is provided with a flange and a sewage discharge door.

The utility model discloses in the target board ware device of quick replacement target board that uses, the chinese utility model patent that patent number that adopts this application inventor in 2019 application is 2019212079440: a target plate device for quickly replacing target plates in a boiler steam blowpipe; the silencer in this application uses the large unit steam blow wash silencer disclosed in the chinese utility model patent No. 2010205476651 applied by the inventor of this application. The utility model provides a face and blow the door and be heavy-calibre, the quick continuous switch of motor direct drive of big moment face and blow the door, open entirely or close entirely within 30 s.

The utility model reasonably arranges a small-pressure-loss particle-collecting high-efficiency particle collector in a primary and secondary steam series-connection blowpipe temporary system, collects granular sundries and part of rust matters similar to powder, avoids the impurities in the superheater pipe from rushing into the reheater pipe to form secondary pollution, and can greatly shorten the blowpipe period; the one set of target board ware device that promotes target plate quality and can quick replacement target plate of configuration to reach quick replacement target plate and reduce operating personnel's regional working strength and danger in high temperature high pressure steam by a wide margin, 45 fixed aluminium matter target plates of forked tail slot type, bolt fastening in the middle of the cancellation target plate, target plate inspection area does not receive the lag bolt to cause unnecessary damage, improve detection quality and precision, and stop to produce non-blowpipe granule vestige when dismantling the target plate because of bolt fastening, cause the target plate quality unqualified, and arouse the blowpipe time extension. The target plate can be quickly taken out only by using a special hook nail during replacement, so that the working strength and the danger of operating personnel are greatly reduced. The blow door is provided with a large caliber, the large torque motor directly drives the quick continuous switch, the full opening or full closing is within 30s, the steam can generate transient pressure drop, the blow pipe coefficient is high, and the blow pipe effect is good. The large silencer (as shown in figure 4) with small pressure loss and good noise reduction effect is arranged, so that the noise during blowing the pipe is greatly reduced, and the pipe can be continuously blown without disturbing residents with the noise of surrounding residents.

The utility model has the advantages that:

(1) the utility model discloses an interim system is including arranging that the pressure loss in one, the interim system of secondary vapour series connection blowpipe is little, the high-efficient particle collector of collection grain, can collect graininess debris, and the similar powdered corrosion thing of part, avoids the intraductal impurity of over heater to dash to the intraductal secondary pollution that forms of reheater, and the blowpipe cycle can shorten by a wide margin.

(2) The utility model provides a target plate adopts the target plate ware device that can quick replacement target plate to reach quick replacement target plate and reduce operation personnel's regional working strength and danger at high temperature high pressure steam by a wide margin.

(3) The utility model is provided with a large caliber, the large torque motor directly drives the blow door of the rapid continuous switch, the full opening or the full closing is within 30s, the steam can generate transient pressure drop, the blow pipe coefficient is high, and the blow pipe effect is good; the steam quantity of the boiler for blowing the pipe of the ultra-supercritical 1000MW boiler is generated mainly by the heat storage quantity of the boiler, the blowing pipe of the boiler is discontinuously carried out, the pressure reduction blowing is carried out, and when the pressure of a steam-water separator of the boiler reaches the formal blowing pipe parameter of 7.0-8.0MPa, the blowing pipe is ensured to have a blowing coefficient larger than 1 by opening a blowing door after a main steam valve of the blowing pipe.

(4) The utility model discloses the configuration pressure loss is little, the large-scale muffler that the noise reduction effect is good for noise reduces by a wide margin during the blowpipe, but the blowpipe in succession does not disturb residents to peripheral resident's noise.

The utility model has the advantages of simple overall structure, the configuration system is succinct, the pressure loss is little, and system stress is little, and the thermal energy is reasonable, adopts the target plate device of self-control quick replacement target plate, and the high-efficient grain collector of a design collection grain directly drives the door that blows that faces that opens soon, and the muffler that falls is fallen to the reasonable blowpipe system and high efficiency of facing of pressure loss, the little inflation of stress for the blowpipe cycle reduces by a wide margin, saves a large amount of fuel and demineralized water, and the process environmental protection is high-efficient.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic structural view of a middle-high efficiency collector of the present invention;

FIG. 3 is a schematic view of the front structure of the blow pipe state of the target plate device of the present invention;

FIG. 4 is a schematic side view of the blow pipe of the target plate device of the present invention;

fig. 5 is a schematic diagram of the front structure of the silencer according to the present invention.

In the figure: 1-superheater, 2-high-pressure main throttle valve, 3-blowing valve, 4-high-efficiency particle collector, 401-outer cylinder, 402-porous pipe, 403-blocking plate, 404-dirt collecting box, 405-flange, 406-blowdown valve, 5-reheater, 6-medium-pressure main throttle valve, 7-target plate device, 700-target plate shaft, 701-target plate, 702-flange sleeve, 703-flange cover, 704-door type top frame, 705-jack, 706-target shaft bracket, 8-emptying temporary pipe, 9-main steam pipe, 10-reheating cooling pipeline, 11-temporary pipeline, 12-steam-water separator and 13-silencer.

Detailed Description

The present invention will be further explained with reference to the drawings and examples. Fig. 1 to 5 are drawings of the embodiment, which are drawn in a simplified manner and are only used for clearly and concisely illustrating the purpose of the embodiment of the present invention. The following detailed description of the embodiments of the present invention is presented in the drawings and is not intended to limit the scope of the invention as claimed. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. It is also to be understood that, unless expressly stated or limited otherwise, the terms "disposed," "connected," and the like are intended to be open-ended, and mean "connected," i.e., fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The embodiment provides a pressure reduction blow pipe system of an ultra supercritical 1000MW boiler, as shown in FIG. 1, the blow pipe system comprises a superheater 1, a high-pressure main steam valve 2, a reheat cooling pipeline 10, a reheater 5, a medium-pressure main steam valve 6 and an emptying temporary pipe 8, wherein an inlet of the superheater 1 is communicated with a steam-water separator 12, an outlet of the superheater 1 is communicated with the high-pressure main steam valve 2 through a main steam pipe 9, the high-pressure main steam valve 2 is communicated with a reheat cooling pipeline 10 through a temporary pipeline 11, a blow-by valve 3 is arranged on the temporary pipeline 11, an outlet of the reheat cooling pipeline 10 is communicated with an inlet of the reheater 5, a high-efficiency particle collector 4 is arranged on the reheat cooling pipeline 10, the reheater 5 is communicated with the emptying temporary pipe 8 through the medium-pressure main steam valve 6, and a target plate device 7 and a silencer 13 for quickly replacing target plates are sequentially arranged on the emptying temporary pipe 8; the two high-pressure main steam valves 2 and the two medium-pressure main steam valves 6 are connected in parallel and then connected with a temporary pipeline 11, and the two medium-pressure main steam valves 6 are connected in parallel and then communicated with the reheater 5 and the emptying temporary pipe 8 respectively. Efficient particle collector 4 is equipped with two, and reheat cooling pipe 10 falls into two branch pipes with reheater 5's link, and two efficient particle collectors 4 set up respectively on two branch pipes. The blowing door 3 is large in caliber, a large-torque motor directly drives the blowing door to be opened and closed quickly and continuously, the opening or closing is within 30s, steam can generate transient pressure drop, the blowing pipe coefficient is high, and the blowing pipe effect is good.

The high-efficiency particle collector 4 in the embodiment comprises an outer cylinder 401 with two open ends and a porous pipe 402 with one open end and the other end provided with a conical plugging plate, as shown in fig. 2, wherein the porous pipe 402 is arranged in the outer cylinder 401, the outer wall of the tail end of the porous pipe 402 is plugged with the outer cylinder 401 through the plugging plate 403 and is fixedly connected with the outer cylinder 401 through the plugging plate 403, and a dirt collecting box 404 is arranged in the outer cylinder 401 corresponding to the opening area of the porous pipe 402; the open tail end of the perforated pipe 402 of the high-efficiency particle collector 4 is communicated with the reheating cooling pipeline 10, and the other end of the perforated pipe is connected with the reheater 5 through the outer cylinder. The lower part of the dirt collection box 404 of the high-efficiency particle collector 4 is provided with a flange 405 and a sewage discharge door 406. The high-efficiency particle collector 4 in the embodiment is arranged on a horizontal pipe 36.8m in front of a boiler and is divided into a left pipe and a right pipe, the size of a particle collector interface is phi 813, the pressure is more than or equal to 6.0MPa, the temperature is more than or equal to 500 ℃, the number of the particle collector interfaces is 2, the total circulating sectional area of a single particle collector is not less than 6 times of the effective sectional area of a main steam pipeline (namely 0.534 square meters), and the resistance of the particle collector is less than or equal to 0.1MPa in consideration of the momentum ratio during pipe blowing and the optimal pipe blowing effect. The pipe diameter of the inner sleeve of the particle collector is the same as that of the cold section, and the pipe sections are drilled with holes staggered in the radial and circumferential directions, and the hole diameter is

Drilling hole is not drilled in the circumferential direction of 200mm at the bottommost part of the sleeve, and slag is discharged from the sleeveThe outlet is connected with the outer pipe for slag discharge through an eccentric reducer, which is beneficial to the clean and thorough slag discharge of the particle collector. A manual gate valve (DN200) is additionally arranged at a slag discharge port of the slag remover to control slag discharge, when a pipe is blown, a slag discharge door of the grain collector is fully opened, impurities which are easy to take away in a superheater, a main steam pipe and a reheating and cooling section pipe are directly discharged, and the slag discharge door of the grain collector is periodically opened during the period of blowing the pipe to discharge slag.

The target plate device 7 for rapidly replacing the target plate in implementation is shown in fig. 3 and 4, and comprises a target plate shaft 700 and a target plate 701 which are arranged on an emptying temporary pipe 8, wherein the target plate shaft 700 is inserted from one side of the emptying temporary pipe 8, penetrates through the emptying temporary pipe 8 and is embedded into a target shaft bracket 706 on the other side, the insertion port of the target plate shaft is sealed through a sealing device, the sealing device comprises a flange sleeve 702, a flange cover 703, a door-shaped top frame 704 and a jack 705, which are arranged at the insertion port of the target plate shaft 700, a target shaft handle of the target plate shaft 700 is arranged between the flange sleeve 702 and the flange cover 703 and is fixedly locked through a fixing bolt, a target plate insertion groove 707 is arranged on the target plate shaft 700, the target plate insertion groove is a dovetail groove with an angle of 45 degrees, and insertion blocks matched with the target plate 701 are arranged on two sides of the target plate 701 and can be matched and inserted into the dovetail grooves on the target plate shaft 700. The door-shaped top frame 704 is erected above the flange sleeve 702, and two ends of the door-shaped top frame are connected with the emptying temporary pipe 8 through pin bolts and rotate within the range of 180 degrees under the loosening state of the pin bolts; the jack 705 is disposed on the flange cover 703, and the other end thereof abuts against the gate-shaped upper frame 704 rotated to a state perpendicular to the target board shaft 700, and the jack 705 abuts against the flange cover 703 to seal under the reaction force of the gate-shaped upper frame 704. The utility model discloses a target plate adopts aluminum plate, and length is: 1115mm, 92mm in width and 10mm in thickness, and performing surface polishing treatment; the target plate is 45-degree dovetail structures, the target plate is fixed in a dovetail groove mode to replace bolt fixing, the target plate is guaranteed not to be replaced by bolts, the target plate is not fastened and detached to be affected, the dovetail groove type target plate is integral in detected surface, and mechanical strength is high. Top opening

The holes are used for placing and extracting target plates. The utility model discloses a during target plate 701 was not placed in the blowpipe initial stage, sealed formation steam passageway with flange cover 703 with target plate ware device upper portion flange and carry out the blowpipe.When the target plate device and the target plate 701 need to be additionally installed on the blow pipe, the flange cover 703 is firstly disassembled, the target plate device and the target plate 703 are placed in the blow pipe, and the flange cover is covered to insert two fixing bolts to be used as the limit of the target plate device. The lance is blown by vertically placing the gantry top frame 704, placing a 16T jack between the gantry top frame and the flange cover and stressing the jack 705 against the stationary flange cover. And closing the blow door after the pressure drop of the single blow pipe, powering off, loosening the jack, horizontally placing the portal frame, taking out the fixing bolt, and opening the flange to take out the target plate by using a special tool. And (4) replacing the new target plate, covering the target plate, inserting the flange cover into the fixing bolt, vertically placing the portal frame, and blowing the pipe once again when the jack is stressed. The blowpipe is required to be placed with the target plate and the operation is repeated.

The steam interim pipeline in the embodiment is connected with muffler 13 from 0m outside the factory building to the main factory building operation layer, and muffler 13 arranges on the outer steel sheet subassembly of zero meter stiff end, and two (the single weight 12 tons) are arranged to the steel sheet subassembly, arranges three sets of supports on the guidance tape, and two sets of sliding support of one set of spacing support, spacing support arrange on the import pipeline of muffler, and two sets of sliding support arrange on the muffler. The silencer has a weight of 19.55T, and 2 silencing air pressure shunt sleeves and an inner pipe are arranged in the silencer

The diameter of the middle pipe is the same as that of the steam exhaust main pipe

Outermost pipe of silencer

The inner, middle and inner pipes are respectively used for partial pressure and noise reduction in a drilling mode, so that the air flow is subjected to partial pressure and steam exhaust along the circumferential direction, and is converged at the outer sleeve of the silencer to horizontally exhaust steam, and the hole diameters of the inner sleeve of the 2 layers of the silencer are respectively

Each row of eyes is empty and wrongThe pipe ends of all layers of the pipe are sealed by the blocking plates, the space between the outermost layer of the pipe and the outermost layer of the pipe of the silencer is reinforced by the rib plates. This muffler is fallen the noise reduction and is good, through noise 85dB in the test factory building, the factory building is outer from muffler 5 meters department noise 98dB,20 meters noise 92dB, the resident living area department noise 81dB outside the factory building enclosure, the noise is not had the muffler relatively much littleer. The blowpipe is effectual, fail safe nature, economical and practical.

The utility model discloses well 1000MW level steam boiler steam system blowpipe flow: the separator is started → the superheater → the main steam pipe → the main steam branch pipe → the main steam valve (the plugging plate) → the temporary branch pipe leading out → the temporary blow pipe control electric door → the temporary pipe → the cold re-pipe → the grain collector → the cold re-pipe → the reheater → the hot stage → the middle joint door front branch pipe → the middle joint door (the plugging plate) → the temporary branch pipe leading out → the temporary pipe → the target plate → the temporary pipe → the silencer exhausting.

The utility model provides a 1000MW level ultra supercritical boiler blowpipe temporary system, under the prerequisite of guaranteeing that the blow pipe coefficient is greater than 1, when adopting the mode blowpipe that steps down, start the separator outlet pressure and decide and open between 7.0 ~ 8.0MPa and face the blow door to adjust according to the site conditions. The control door opening and closing stage is to ensure that the steam saturation temperature is not lower than 42 ℃. Controlling the temperature of main steam within 450 ℃ and the temperature of reheated steam within 500 ℃ in the process of blowing the pipe; the design pressure P of a temporary pipeline before a blowing door 3 is more than 10.0MPa, and t is more than or equal to 500 ℃; the design pressure P of a temporary pipeline after the blow door is greater than 6.0MPa, and t is more than or equal to 500 ℃; leading out the medium-pressure main valve 6 until the design pressure P of the emptying temporary pipe 8 is more than 5.0MPa, and t is more than or equal to 500 ℃; the design pressure P of the steam exhaust main pipe is more than 2.0MPa, and t is more than or equal to 500 ℃.

The stress analysis of the temporary blowing pipe and the formal pipe connected with the temporary blowing pipe adopts CAESAR II software, and the working conditions of the pipe parameters and the boundary conditions comprise a cold state (SUS), a hot state (OPE) containing silencer exhaust steam counter-force, a thermal expansion state (EXP) and the like according to a temporary pipe layout (including support and hanger positioning), temporary blowing pipe steam parameters and blowing pipe range, high-pressure main steam valve interface thermal displacement and the like. The calculation result shows that the primary and secondary stress values of the pipe system are qualified according to the arrangement of the support and hanger in the stress calculation, the thrust, the moment and the like of the high-pressure main steam valve interface meet the requirements of a steam turbine plant, and the calculation is passed. And (3) giving the type, load and displacement of the support and hanger to the load of the support and hanger in the stress analysis result, and mounting by combining a layout diagram during field mounting. When the supporting and hanging frame is installed on site, the supporting and hanging frame is installed according to the design type of the supporting and hanging frame, the load of each part of the supporting and hanging frame is guaranteed to meet the designed load requirement, the supporting and hanging frame with a gap (gap) value is controlled in an enhanced mode, and the installation precision is guaranteed to meet the gap requirement.

The Hubei energy Ezhou power plant three-phase project 2 x 1000MW ultra-supercritical unit adopts HG-3159/29.3-YM6 ultra-supercritical variable-pressure operation direct-flow boiler produced by Harbin boiler plant Limited liability company, adopts II-shaped arrangement, a single hearth, a primary intermediate reheating, a low NOX main burner, a high-level over-fire air staged combustion technology and a reverse double tangential combustion mode, and the hearth is an internal threaded pipe vertical rising membrane type water-cooled wall and is provided with a circulating pump starting system. And a pressure reduction blow pipe is adopted as a blow pipe of the boiler. The interim system of blowpipe is according to the utility model discloses arrange, its practical application, safe and reliable, the blowpipe cycle is short, for the unit create the condition and save fuel and demineralized water in a large number in advance, environmental protection and economic benefits are good.

The above description is only one embodiment of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (5)

1. The utility model provides an ultra supercritical 1000MW level boiler step-down blowpipe system which characterized in that: the blowpipe system comprises a superheater (1), a high-pressure main throttle valve (2), a reheating cooling pipeline (10), a reheater (5), a medium-pressure main throttle valve (6) and an emptying temporary pipe (8), the inlet of the superheater (1) is communicated with a steam-water separator (12), the outlet of the superheater (1) is communicated with a high-pressure main steam valve (2) through a main steam pipe (9), the high-pressure main steam valve (2) is communicated with a reheating cooling pipeline (10) through a temporary pipeline (11), the temporary pipeline (11) is provided with a blowing door (3), the outlet of the reheating cooling pipeline (10) is communicated with the inlet of the reheater (5), the reheating cooling pipeline (10) is provided with a high-efficiency particle collector (4), the reheater (5) is communicated with an emptying temporary pipe (8) through a medium-pressure main valve (6), a target plate device (7) for rapidly replacing a target plate and a silencer (13) are sequentially arranged on the emptying temporary pipe (8); the blowing door (3) adopts an electric direct-drive quick-opening blowing door; the efficient particle collector (4) comprises an outer cylinder (401) with two open ends and a porous pipe (402) with one open end and the other end provided with a conical plugging plate, the porous pipe (402) is arranged in the outer cylinder (401), the outer wall of the tail end of the porous pipe (402) is plugged with the outer cylinder (401) through a plugging plate (403) and is fixedly connected with the outer cylinder (401) through the plugging plate (403), and a dirt collecting box (404) is arranged in the outer cylinder (401) corresponding to the hole opening area of the porous pipe (402); the opening tail end of a perforated pipe (402) of the high-efficiency particle collector (4) is communicated with a reheating cooling pipeline (10), and the other end of the perforated pipe is connected with a reheater (5) through an outer cylinder.

2. The ultra supercritical 1000MW class boiler depressurization blowpipe system of claim 1 wherein: the high-pressure main steam valves (2) and the medium-pressure main steam valves (6) are arranged in two, the two high-pressure main steam valves (2) are connected in parallel and then connected with a temporary pipeline (11), and two ends of the two medium-pressure main steam valves (6) are connected in parallel and then communicated with the reheater (5) and the emptying temporary pipe (8) respectively.

3. The ultra supercritical 1000MW class boiler depressurization blowpipe system of claim 1 or 2 wherein: efficient particle collector (4) are equipped with two, and reheat cooling pipe (10) divide into two branch pipes with the link of reheater (5), and two efficient particle collectors (4) set up respectively on two branch pipes.

4. The ultra supercritical 1000MW class boiler depressurization blowpipe system of claim 1 or 2 wherein: the target plate device (7) for rapidly replacing the target plate comprises a target plate shaft (700) and a target plate (701) which are arranged on an emptying temporary pipe (8), the target plate shaft (700) is inserted from one side of the emptying temporary pipe (8), after penetrating through the emptying temporary pipe (8), the temporary pipe is embedded into a target shaft bracket (767) at the other side, the insertion port of the target plate shaft is sealed by a sealing device, the sealing device comprises a flange sleeve (702) arranged at the insertion port of the target plate shaft (700), a flange cover (703), a door-shaped top frame (704) and a jack (705), a target shaft handle of the target plate shaft (700) is arranged between the flange sleeve (702) and the flange cover (703) and is fixedly locked by a fixing bolt, a target plate slot is arranged on the target plate shaft (700), the target plate slot is a dovetail groove with an angle of 45 degrees, the two sides of the target plate (701) are provided with inserting blocks matched with the target plate, and the inserting blocks can be matched and inserted into dovetail grooves on the target plate shaft (700); the door-shaped top frame (704) is erected above the flange sleeve (702), and two ends of the door-shaped top frame are connected with the evacuation temporary pipe (8) through pin bolts and rotate within a range of 180 degrees under the loosening state of the pin bolts; the jack (705) is arranged on the flange cover (703), the other end of the jack is abutted with the door-shaped top frame (704) which rotates to be vertical to the target plate shaft (700), and the jack (705) tightly abuts against the flange cover (703) to seal under the reaction force of the door-shaped top frame (704).

5. The ultra supercritical 1000MW class boiler depressurization blowpipe system of claim 1 or 2 wherein: the lower part of a dirt collecting box (404) of the high-efficiency particle collector (4) is provided with a flange (405) and a sewage discharge door (406).

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