CN220017332U - Stable-pressure-reducing blowpipe device for preventing waste heat furnace reheater from dry combustion - Google Patents

Abstract

The utility model discloses a stable-pressure and low-pressure blowpipe device for preventing a waste heat furnace reheater from dry combustion, which comprises the following components: the high-pressure purging unit and the medium-pressure purging unit are connected with the reheater unit in a pipe joint manner, so that the reheater unit can be ensured to have steam circulation in the whole process of a blowpipe; the low-pressure purging unit and the medium-pressure purging unit are connected with the condenser unit in a pipe way, so that main steam can be directly recovered into the condenser unit through corresponding bypasses without passing through a steam turbine. The stable pressure reduction blowpipe device for preventing the waste heat furnace reheater from dry burning can prevent the reheater from being in a dry burning state when the blowpipe is blown.

Description

Stable-pressure-reducing blowpipe device for preventing waste heat furnace reheater from dry combustion

Technical Field

The utility model relates to the technical field of blowpipes, in particular to a stable pressure reduction blowpipe device for preventing a waste heat furnace reheater from dry combustion.

Background

Purging of boiler steam piping is an important process prior to operation of a newly built unit or a unit subjected to significant technical improvement, with the purpose of removing various impurities left in the superheater system and steam piping during manufacturing, transportation, storage, and installation, such as: sand, stone, turnings, iron scales and the like, prevent the damage of a tube explosion of a superheater and a ventilation part of a steam turbine in the running process of the unit, improve the safety and the economy of the unit, and improve the steam quality in the running process.

The existing pipe blowing technology of the waste heat boiler adopts the sectional blowing of the over-reheater, the temporary pipeline installation and recovery are complicated to delay the air supply, or adopts the cascade pipe blowing technology of the reheater for dry combustion, and the existing pipe blowing technology all needs to keep the reheater in a dry state. When the temporary flushing door is opened, steam enters the reheater system, the reheater pipe is rapidly cooled, and when the temporary flushing door is closed, the steam leaves the reheater, and the pipe wall temperature is rapidly increased. The severe change of the tube wall temperature can generate larger alternating stress, so that the fatigue damage of the reheater tube is caused, and the service life of the reheater tube is influenced.

Disclosure of Invention

The technical problems to be solved by the utility model are as follows: the problem that the blowpipe technology of the high-pressure and medium-pressure systems needs to keep the reheater in a dry-burning state is solved.

In order to solve the technical problems, the utility model provides the following technical scheme:

a steady-pressure reducing blowpipe device for preventing a waste heat furnace reheater from dry combustion, comprising: the high-pressure purging unit, the medium-pressure purging unit, the low-pressure purging unit, the reheater unit (400) and the condenser unit (700), wherein the high-pressure purging unit and the medium-pressure purging unit are connected with the reheater unit in a pipe joint manner, so that the reheater unit (400) can be ensured to have steam circulation in the whole process of a blowing pipe; the low-pressure purging unit and the medium-pressure purging unit are connected with the condenser unit (700) in a pipe mode, and main steam can be directly recovered into the condenser unit (700) through corresponding bypasses without a steam turbine.

In one embodiment of the utility model, the stable pressure reducing blowpipe device for preventing the waste heat furnace reheater from dry burning further comprises a target plate device (500) and a silencer (600), wherein the target plate device (500) and the silencer (600) are connected through a temporary main pipeline (560); and the high pressure purge unit, the medium pressure purge unit, the low pressure purge unit, and the reheater unit (400) are all piped with the target board device (500) through the temporary main pipe (560).

In one embodiment of the utility model, the high pressure purge unit comprises a high pressure superheater (110), a high pressure main valve (120), a high pressure bypass valve (130), a high pressure main face flushing valve (140), a particle collector (150) and a high pressure discharge check valve (160); -the high pressure superheater (110) is cascade piped with the reheater unit (400); after the high-pressure main valve (120) is connected with the high-pressure superheater (110) in a pipe way, the high-pressure main valve is connected with a high-pressure temporary pipeline (170) to the high-pressure discharge check valve (160) in a pipe way; the high-pressure temporary pipeline (170) is divided into two paths, the two paths are respectively provided with the high-pressure main temporary flushing gate (140) and the high-pressure bypass gate (130), and the two paths are combined and connected with the particle collector (150) and then connected with the pipeline between the high-pressure discharge check gate (160) and the pipe connector of the reheater unit (400).

In an embodiment of the present utility model, the high-pressure purge unit further comprises a high-pressure cylinder (180) and a high-pressure bypass temporary flushing gate (190), wherein the high-pressure cylinder (180) is connected with the high-pressure main valve (120) and the high-pressure discharge check valve (160) respectively; the high pressure bypass critical gate (190) is piped to the high pressure superheater (110) and the reheater unit (400), respectively.

In an embodiment of the utility model, the medium pressure purge unit comprises a medium pressure superheater (210), a medium pressure check valve (220), a medium pressure temporary flushing manual valve (230) and a medium pressure temporary flushing valve (240); the medium-pressure superheater (210) is connected with a medium-pressure temporary pipeline (250) in front of the medium-pressure check valve (220), and two paths are respectively arranged, one path of the medium-pressure superheater is connected with the medium-pressure temporary manual valve (230) in a pipe joint mode and then can ignite and exhaust steam nearby, the other path of the medium-pressure superheater is connected with the medium-pressure temporary valve (240) and the reheater unit (400) in a pipe joint mode in sequence, and the medium-pressure superheater (210) is also connected with the medium-pressure check valve (220) and the reheater unit (400) in a pipe joint mode in sequence.

In an embodiment of the utility model, the medium pressure purge unit further comprises a medium pressure bypass door (260), a medium pressure main valve (270) and a medium pressure cylinder (280), the medium pressure main valve (270) and the medium pressure cylinder (280) are connected by pipe, and the medium pressure main valve (270) is also connected by pipe with the temporary main pipe (560) through the medium pressure temporary pipe (250); the intermediate pressure bypass gate (260) is piped with the temporary main pipe (560) and the reheater unit (400).

In an embodiment of the utility model, the low pressure purge unit comprises a low pressure superheater (310), a low pressure intake screen (320), a low pressure main valve (330) and a low pressure cylinder (340); the low pressure superheater (310) is connected with the low pressure air inlet filter screen (320), the low pressure main valve (330) and the low pressure cylinder (340) in sequence.

In an embodiment of the utility model, the low pressure purge unit further comprises a low pressure bypass gate (350), a low pressure bypass pilot gate (360), a low pressure pilot gate (370) and a low pressure pilot manual gate (380); the low-pressure bypass door (350) is connected with the low-pressure superheater (310) in a pipe way, is connected with the low-pressure bypass temporary flushing door (360) in a pipe way through a low-pressure temporary pipeline (390) and then is connected with the temporary main pipeline (560), and is connected with the low-pressure temporary flushing manual door (380) in a pipe way between the low-pressure bypass door (350) and the low-pressure bypass temporary flushing door (360); the low-pressure temporary flushing gate (370) is respectively connected with the pressure air inlet filter screen (320) and the temporary main pipeline (560) through the low-pressure temporary pipeline (390).

In one embodiment of the utility model, the condenser unit (700) is piped to the medium pressure bypass door (260).

In one embodiment of the utility model, the condenser unit (700) is plumbed to a low pressure bypass door (350).

Compared with the prior art, the utility model has the beneficial effects that:

1. the high-pressure purging unit, the medium-pressure purging unit and the low-pressure purging unit can ensure that the reheater unit has steam circulation in the whole process of the blowpipe, so that the reheater unit cannot be dry-burned, and the service life of the reheater pipe is prolonged.

2. During the steam blowing pipe, all heating surfaces have steam circulation, and the dry burning phenomenon of the reheater system can not occur any more.

3. The phenomenon that the safety valve is set up due to the fact that the overpressure of the medium-pressure purging unit and the low-pressure purging unit occurs when the high-pressure purging unit targets in the existing purging method is avoided.

4. The high, medium and low pressure blowing units can adopt a stable and low pressure combined blowing pipe mode, the blowing pipe time is short, and the blowing pipe effect is better.

5. The temporary pipelines of the high, medium and low pressure purging units are finally gathered on the temporary main pipeline, the characteristics of short distance between the formal pipeline and the temporary pipeline, compact arrangement, convenient installation and convenient system recovery are fully utilized, all heating surface systems can perform targeting, and a target plate device on the temporary main pipeline can be used during targeting, so that the operation is convenient and safe.

Drawings

FIG. 1 is a schematic diagram of a stable and low pressure blowpipe apparatus for preventing dry heating of a waste heat furnace reheater according to the present utility model.

Detailed Description

In order to facilitate the understanding of the technical scheme of the present utility model by those skilled in the art, the technical scheme of the present utility model will be further described with reference to the accompanying drawings.

The terms "first," "second," and the like, 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1, the present embodiment provides a stable pressure reducing blowpipe apparatus for preventing dry heating of a reheater of a waste heat furnace, including: the high-pressure purging unit, the medium-pressure purging unit, the low-pressure purging unit, the reheater unit 400 and the condenser unit 700 are connected with the reheater unit in a pipe joint mode, and therefore the reheater unit 400 can be guaranteed to circulate steam in the whole process of a blowing pipe. The low-pressure purging unit and the medium-pressure purging unit are connected with the condenser unit 700 in a pipe manner, so that main steam can be directly recovered into the condenser unit 700 through corresponding bypasses without a steam turbine.

Referring to fig. 1, in an embodiment of the utility model, the stable pressure reducing blowpipe apparatus for preventing dry burning of the reheater of the waste heat furnace further includes a target plate device 500 and a muffler 600, and the target plate device 500 and the muffler 600 are connected by a temporary main pipe 560; and the high pressure purge unit, the medium pressure purge unit, the low pressure purge unit, and the reheater unit 400 are all piped to the target plate 500 through a temporary main pipe 560.

Referring to fig. 1, in an embodiment of the present utility model, the high-pressure purge unit includes a high-pressure superheater 110, a high-pressure main valve 120, a high-pressure bypass valve 130, a high-pressure main adjacent valve 140, a particle collector 150 and a high-pressure discharge check valve 160, and the high-pressure superheater 110 is cascade-connected with a reheater unit 400. After the high-pressure main valve 120 is connected with the high-pressure superheater 110, the high-pressure main valve 120 is connected with the high-pressure temporary pipeline 170 to the high-pressure discharge check valve 160, wherein the high-pressure temporary pipeline 170 is divided into two paths, the high-pressure main temporary valve 140 and the high-pressure bypass valve 130 are respectively arranged on the two paths, and the two paths are combined and connected with the particle collector 150 and connected with the pipeline between the high-pressure discharge check valve 160 and the reheater unit 400. The high pressure purge unit further includes a high pressure cylinder 180 and a high pressure bypass temporary flushing gate 190, the high pressure cylinder 180 is respectively connected with the high pressure main valve 120 and the high pressure exhaust check valve 160, and the high pressure bypass temporary flushing gate 190 is respectively connected with the high pressure superheater 110 and the reheater unit 400. During purging, the high-pressure bypass temporary gate 190 maintains a certain opening to ensure that the reheater unit 400 always has steam passing through. The high-pressure superheater 110 and the reheater unit 400 are purged by adopting a pressure-reducing blowpipe mode, and the high-pressure bypass where the high-pressure bypass temporary flushing gate 190 is located is purged by adopting a blowpipe mode combining pressure stabilization and pressure reduction.

Referring to fig. 1, in an embodiment of the present utility model, the medium pressure purge unit includes a medium pressure superheater 210, a medium pressure check valve 220, a medium pressure temporary flushing manual valve 230 and a medium pressure temporary flushing valve 240. The intermediate pressure superheater 210 is connected to the intermediate pressure temporary pipeline 250 in front of the intermediate pressure check valve 220, and respectively comprises two paths, one path is connected to the intermediate pressure temporary flushing manual valve 230 in a pipe joint manner, so that steam can be discharged in a nearby ignition manner, the other path is connected to the intermediate pressure temporary flushing valve 240 and the reheater unit 400 in sequence, and the intermediate pressure superheater 210 is also connected to the intermediate pressure check valve 220 and the reheater unit 400 in sequence. The medium pressure purge unit further includes a medium pressure bypass port 260, a medium pressure main port 270 and a medium pressure cylinder 280, the medium pressure main port 270 and the medium pressure cylinder 280 are piped, and the medium pressure main port 270 is also piped to the temporary main pipe 560 through a medium pressure temporary pipe 250. The intermediate pressure bypass gate 260 is piped to the temporary main pipe 560 and the reheater unit 400. The medium-pressure superheater 210 is purged by adopting a pressure-stabilizing blowpipe mode, and the medium-pressure bypass pipeline where the medium-pressure bypass door 260 is located is purged by adopting a pressure-reducing blowpipe mode.

Referring to FIG. 1, in one embodiment of the utility model, the low pressure purge unit includes a low pressure superheater 310, a low pressure intake screen 320, a low pressure main valve 330 and a low pressure cylinder 340. The low pressure superheater 310 is in turn piped with a low pressure intake screen 320, a low pressure main valve 330 and a low pressure cylinder (340). The low pressure purge unit also includes a low pressure bypass gate 350, a low pressure bypass pilot gate 360, a low pressure pilot gate 370, and a low pressure pilot manual gate 380. The low pressure bypass gate 350 is connected with the low pressure superheater 310, is connected with the low pressure bypass temporary gate 360 through a low pressure temporary pipeline 390, is connected with the temporary main pipeline 560, and is connected with the low pressure temporary gate 380 between the low pressure bypass gate 350 and the low pressure bypass temporary gate 360. The low pressure temporary gate 370 is piped to the pressure inlet screen 320 and temporary main pipe 560, respectively, through a low pressure temporary pipe 390. The low pressure superheater 310 and the low pressure bypass are purged by a combination of pressure stabilization and depressurization.

Referring to fig. 1, in an embodiment of the utility model, the stable pressure reducing blowpipe apparatus for preventing dry heating of the reheater of the waste heat furnace further includes a condenser unit 700, and the condenser unit 700 is connected to the middle pressure bypass door 260 and the low pressure bypass door 350 in a pipe connection manner. Conventionally, the medium-pressure main steam and the low-pressure main steam are fed into the steam turbine, and when the gas-steam combined cycle unit is started in an initial stage or in an accident state, the medium-pressure main steam can be directly recycled into the condenser unit 700 through the medium-pressure bypass without passing through the steam turbine. Likewise, the low pressure main steam may be directly recycled to the condenser unit 700 through the low pressure bypass without passing through the turbine. In fig. 1, the broken line is denoted as a temporary pipe, and the solid line is denoted as a regular pipe.

Referring to fig. 1, in one embodiment of the present utility model, during the high pressure purge unit purge: the high pressure main valve 120 is blocked and when the high pressure main vapor pressure is less than the defined pressure, the high pressure main pilot valve 140 is in a closed state. When the pressure of the high-pressure main steam is greater than the limiting pressure, the opening of the high-pressure main temporary flushing gate 140 is fully opened, and the high-pressure main steam sequentially passes through the high-pressure superheater 110, the high-pressure main temporary flushing gate 140, the particle collector 150, the reheater unit 400, the temporary main pipeline 560, the target plate 500 and the silencer 600, so as to perform depressurization and purge on the high-pressure superheater 110 and the reheater unit 400. And in the initial stage of the blowpipe, the high-pressure bypass temporary flushing gate 190 always keeps a certain opening degree for pressure stabilization and purging, and the high-pressure main steam enters the reheater unit 400 through the high-pressure bypass temporary flushing gate 190, so that the reheater unit 400 is ensured to circulate steam in the whole process of the blowpipe. Wherein the limiting pressure is 4MPa.

Referring to fig. 1, in one embodiment of the present utility model, during the medium pressure purge unit purge: the medium pressure main valve 270 is blocked. In the initial stage of the blowpipe, the middle pressure temporary flushing door 240 is closed, the opening of the middle pressure temporary flushing manual door 230 is fully opened, and the middle pressure main steam sequentially passes through the middle pressure superheater 210 and the middle pressure temporary flushing manual door 230 and then can be ignited nearby to discharge steam, so that the middle pressure superheater 210 performs pressure stabilizing purging. After the nearby ignition exhaust steam is discharged out of the medium-pressure main steam, the high-pressure bypass temporary flushing door 190 and the medium-pressure temporary flushing manual door 230 are closed, the medium-pressure temporary flushing door 240 is opened, the medium-pressure main steam is discharged after passing through the medium-pressure superheater 210, the medium-pressure temporary flushing door 240, the reheater unit 400, the target plate device 500 and the silencer 600, and the medium-pressure main steam can be discharged after passing through the medium-pressure check door 220, the reheater unit 400, the target plate device 500 and the silencer 600 in sequence, wherein the medium-pressure superheater 210 is still in a pressure-stabilizing blowing pipe state, and the reheater unit 400 always has steam circulation in the whole process of a blowing pipe. And when the high pressure main valve 120 is opened, the steam at the outlet of the reheater unit 400 simultaneously performs depressurization and purge on the medium pressure bypass where the medium pressure bypass door 260 is located. Wherein, because the resistance of the heating surface of the medium-pressure superheater 210 is smaller, the blowing pipe coefficient can be larger than 1 in the two-stage pressure-stabilizing blowing pipe process.

Referring to FIG. 1, in one embodiment of the present utility model, during the purge of the low pressure purge unit: when the pressure reduction purging is adopted, the low-pressure bypass temporary flushing door 360 and the low-pressure temporary flushing door 370 are closed, the low-pressure main steam is pressurized, when the pressure reaches a certain degree, the low-pressure bypass temporary flushing door 360 and the low-pressure temporary flushing door 370 are fully opened, and the main steam is sequentially subjected to the pressure reduction purging through the low-pressure superheater 310 and the low-pressure bypass door 350. When the pressure-stabilizing purging is adopted, the low-pressure bypass temporary flushing door 360 and the low-pressure temporary flushing door 370 are fully opened, the low-pressure main steam is discharged after passing through the low-pressure superheater 310, the low-pressure bypass temporary flushing door 360, the low-pressure temporary flushing door 370, the target plate device 500 and the silencer 600, and the low-pressure superheater 310 is purged in a pressure-stabilizing manner. In this case, since the reheater unit 400 circulates the medium-pressure main steam having a higher pressure, the low-pressure main steam cannot be blown back into the reheater unit 400 when the low-pressure purge unit stabilizes the blowpipe. The low-pressure superheater 310 has small design resistance, and the blowing pipe coefficient meets the requirement of a blowing pipe guide rule when the blowing pipe is stabilized.

Referring to FIG. 1, in one embodiment of the present utility model, when the target plate 500 needs to be replaced: the high pressure main critical gate 140, the high pressure bypass critical gate 190, the medium pressure critical gate 230, the medium pressure critical gate 240, the low pressure bypass critical gate 360, the low pressure critical gate 370 and the low pressure critical gate 380 are closed, and the target plate device 500 is replaced. When a certain heating surface needs to be targeted, the corresponding temporary flushing door is fully opened for purging. During the pressure holding period of the high-pressure superheater 110 and the reheater unit 400, the pressure rising speed of the steam of the medium-pressure superheater 210 and the low-pressure superheater 310 is high, so that the whole purging system has an overpressure risk, and when the medium-pressure main steam and the low-pressure main steam approach the pressure of the safety valve seat, the medium-pressure temporary flushing manual door 230 and the low-pressure temporary flushing manual door 380 in the medium-pressure main steam pipeline are respectively opened for pressure relief.

Referring to fig. 1, in an embodiment of the present utility model, the present utility model can be applied to other types of boilers, such as a dual-pressure waste heat boiler, a subcritical drum furnace, a supercritical once-through furnace, and the like.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model 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.

The above-described embodiments merely represent embodiments of the utility model, the scope of the utility model is not limited to the above-described embodiments, and it is obvious to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.

Claims (10)

1. A steady voltage step-down blowpipe apparatus for preventing waste heat furnace reheater dry combustion method, characterized by comprising: the high-pressure purging unit, the medium-pressure purging unit, the low-pressure purging unit, the reheater unit (400) and the condenser unit (700), wherein the high-pressure purging unit and the medium-pressure purging unit are connected with the reheater unit in a pipe joint manner, so that the reheater unit (400) can be ensured to have steam circulation in the whole process of a blowing pipe; the low-pressure purging unit and the medium-pressure purging unit are connected with the condenser unit (700) in a pipe mode, and main steam can be directly recovered into the condenser unit (700) through corresponding bypasses without a steam turbine.

2. The steady and low pressure blowpipe apparatus for preventing dry combustion of a waste heat furnace reheater according to claim 1, further comprising a target plate device (500) and a muffler (600), the target plate device (500) and the muffler (600) being connected by a temporary main pipe (560); and the high pressure purge unit, the medium pressure purge unit, the low pressure purge unit, and the reheater unit (400) are all piped with the target board device (500) through the temporary main pipe (560).

3. The steady-state depressurization blowpipe apparatus for preventing dry combustion of a waste heat furnace reheater according to claim 2, wherein the high-pressure purge unit includes a high-pressure superheater (110), a high-pressure main valve (120), a high-pressure bypass valve (130), a high-pressure main temporary flushing valve (140), a particle collector (150), and a high-pressure discharge check valve (160); -the high pressure superheater (110) is cascade piped with the reheater unit (400); after the high-pressure main valve (120) is connected with the high-pressure superheater (110) in a pipe way, the high-pressure main valve is connected with a high-pressure temporary pipeline (170) to the high-pressure discharge check valve (160) in a pipe way; the high-pressure temporary pipeline (170) is divided into two paths, the two paths are respectively provided with the high-pressure main temporary flushing gate (140) and the high-pressure bypass gate (130), and the two paths are combined and connected with the particle collector (150) and then connected with the pipeline between the high-pressure discharge check gate (160) and the pipe connector of the reheater unit (400).

4. A steady pressure reducing blowpipe apparatus for preventing dry combustion of a waste heat furnace reheater according to claim 3, wherein the high pressure purge unit further comprises a high pressure cylinder (180) and a high pressure bypass temporary flushing gate (190), the high pressure cylinder (180) being respectively connected with the high pressure main valve (120) and the high pressure discharge check valve (160); the high pressure bypass critical gate (190) is piped to the high pressure superheater (110) and the reheater unit (400), respectively.

5. The steady voltage reducing blowpipe apparatus for preventing dry combustion of a waste heat furnace reheater according to claim 2, wherein the medium voltage purge unit includes a medium voltage superheater (210), a medium voltage check valve (220), a medium voltage temporary flushing manual valve (230) and a medium voltage temporary flushing valve (240); the medium-pressure superheater (210) is connected with a medium-pressure temporary pipeline (250) in front of the medium-pressure check valve (220), and two paths are respectively arranged, one path of the medium-pressure superheater is connected with the medium-pressure temporary manual valve (230) in a pipe joint mode and then can ignite and exhaust steam nearby, the other path of the medium-pressure superheater is connected with the medium-pressure temporary valve (240) and the reheater unit (400) in a pipe joint mode in sequence, and the medium-pressure superheater (210) is also connected with the medium-pressure check valve (220) and the reheater unit (400) in a pipe joint mode in sequence.

6. The steady voltage reducing blowpipe apparatus for preventing dry combustion of a waste heat furnace reheater according to claim 5, characterized in that the medium voltage purge unit further comprises a medium voltage bypass gate (260), a medium voltage main gate (270) and a medium voltage cylinder (280), the medium voltage main gate (270) and the medium voltage cylinder (280) are piped, and the medium voltage main gate (270) is also piped with the temporary main pipe (560) through the medium voltage temporary pipe (250); the intermediate pressure bypass gate (260) is piped with the temporary main pipe (560) and the reheater unit (400).

7. The steady-state depressurization blowpipe apparatus for preventing dry combustion of a furnace reheater according to claim 2, wherein said low pressure purge unit includes a low pressure superheater (310), a low pressure intake screen (320), a low pressure main valve (330) and a low pressure cylinder (340); the low pressure superheater (310) is connected with the low pressure air inlet filter screen (320), the low pressure main valve (330) and the low pressure cylinder (340) in sequence.

8. The steady voltage reducing blowpipe apparatus for preventing dry combustion of a waste heat furnace reheater according to claim 7, wherein the low pressure purge unit further comprises a low pressure bypass gate (350), a low pressure bypass temporary flushing gate (360), a low pressure temporary flushing gate (370), and a low pressure temporary flushing manual gate (380); the low-pressure bypass door (350) is connected with the low-pressure superheater (310) in a pipe way, is connected with the low-pressure bypass temporary flushing door (360) in a pipe way through a low-pressure temporary pipeline (390) and then is connected with the temporary main pipeline (560), and is connected with the low-pressure temporary flushing manual door (380) in a pipe way between the low-pressure bypass door (350) and the low-pressure bypass temporary flushing door (360); the low-pressure temporary flushing gate (370) is respectively connected with the pressure air inlet filter screen (320) and the temporary main pipeline (560) through the low-pressure temporary pipeline (390).

9. The steady and steady pressure reducing blowpipe apparatus as claimed in claim 6, characterized in that the condenser unit (700) is connected with the medium pressure bypass gate (260).

10. The steady and steady pressure reducing blowpipe apparatus as claimed in claim 8, characterized in that the condenser unit (700) is connected with a low pressure bypass gate (350).