CN219433299U - Pressure blasting pulse shock wave soot blower - Google Patents

Abstract

The utility model provides a pressure explosion pulse shock wave soot blower, which comprises an explosion pulse shock wave generator, a pulse valve, an igniter and a shock wave guide pipe; the explosion pulse shock wave generator is a container for containing combustible premixed gas with set pressure; the explosion pulse shock wave generator comprises a gas outlet, the gas outlet is connected with the boiler sequentially through a pulse valve and a shock wave conduit, and the igniter is arranged on the explosion pulse shock wave generator, the pulse valve or the shock wave conduit and used for igniting the combustible premixed gas so as to perform soot blowing operation on the boiler by utilizing shock waves formed by explosion of the combustible premixed gas. The method can not only improve the strength of the explosion shock wave by a plurality of times, but also improve the energy of the explosion soot blowing by a plurality of times on the premise of keeping the volume of the pulse shock wave generator unchanged, thereby greatly improving the soot blowing effect.

Description

Pressure blasting pulse shock wave soot blower

Technical Field

The utility model relates to the technical field of boiler soot blowers, in particular to a pressure blasting pulse shock wave soot blower.

Background

The soot blower belongs to an auxiliary machine of a boiler, and has the functions of blowing off accumulated ash on a heating surface of the boiler in the operation process of the boiler, reducing smoke resistance and improving heat exchange efficiency. The soot blowing effect of the soot blower directly influences the running load and the thermal efficiency of the boiler, and has very important significance on the normal running and the economic benefit of the boiler. In addition to oil and gas boilers, most power generation/heat supply boilers using coal, biomass, garbage and the like as fuels and most industrial waste heat boilers are required to be provided with soot blowers.

The boiler soot blower is of various types, and is more commonly a steam soot blower, an acoustic wave soot blower, a blasting pulse shock wave soot blower, an air cannon pulse shock wave soot blower, a hydraulic soot blower and the like.

The explosion pulse shock wave soot blower, also called explosion pulse shock wave soot blower, thermal explosion pulse shock wave soot blower, weak explosion pulse shock wave soot blower, explosion shock wave soot blower, etc., is abbreviated as explosion soot blower, thermal explosion soot blower, weak explosion soot blower, pulse soot blower, shock wave soot blower, explosion wave soot blower, etc., belongs to the emerging soot blower, and is invented by the Ucklander at the earliest, and the development history in China is only twenty years. The soot blower mainly performs soot blowing by means of comprehensive actions such as impact of compression shock waves generated by premixed combustible gas blasting, and the impact waves cannot cause serious scour and abrasion to heating surfaces such as boiler tube bundles and the like steam soot blowing, dead angles are avoided in the effective soot blowing range, the manufacturing cost is relatively low, the failure rate and the operation cost are low, and the application of the soot blower is very popular at present.

So far, the existing explosion pulse soot blower can only charge air under normal pressure and explode under normal pressure, which is unfavorable for improving the explosion soot blowing energy, the explosion shock wave intensity and the effective soot blowing range.

Disclosure of Invention

The utility model aims to provide a pressure blasting pulse shock wave soot blower so as to solve at least one of the problems in the prior art.

In order to achieve the above purpose, the utility model provides a pressure blasting pulse shock wave soot blower, comprising: the device comprises a blasting pulse shock wave generator, a pulse valve, an igniter and a shock wave guide tube;

the explosion pulse shock wave generator is a container for containing combustible premixed gas with set pressure;

the explosion pulse shock wave generator comprises a gas outlet, the gas outlet is connected with the boiler sequentially through a pulse valve and a shock wave conduit, and the igniter is arranged on the explosion pulse shock wave generator, the pulse valve or the shock wave conduit and used for igniting the combustible premixed gas so as to perform soot blowing operation on the boiler by utilizing shock waves formed by explosion of the combustible premixed gas.

The method can not only improve the strength of the explosion shock wave by a plurality of times, but also improve the energy of the explosion soot blowing by a plurality of times on the premise of keeping the volume of the pulse shock wave generator unchanged, thereby greatly improving the soot blowing effect.

Further, the explosion pulse shock wave generator is provided with a gas inlet which is connected with a gas source and is used for introducing the combustible premixed gas into the explosion pulse shock wave generator;

Or, the explosion pulse shock wave generator is provided with a plurality of gas inlets, and the plurality of gas inlets are respectively connected with a plurality of gas sources and are used for respectively introducing a plurality of gases into the explosion pulse shock wave generator, and the plurality of gases are mixed to form the combustible premixed gas.

The gas outlet of the explosion pulse shock wave generator is directly connected with the inlet of the pulse valve or is connected with the gas outlet of the explosion pulse shock wave generator through an intermediate pipeline.

Further, the igniter is mounted in the blast pulse shock wave generator at an end remote from the gas outlet of the blast pulse shock wave generator.

Further, a flame accelerating piece is arranged in the explosion pulse shock wave generator, one end of the flame accelerating piece is close to the igniter, and the other end of the flame accelerating piece is close to a gas outlet of the explosion pulse shock wave generator and is used for increasing disturbance of flame in the explosion pulse shock wave generator so as to increase propagation speed of flame in the explosion pulse shock wave generator.

The flame accelerating piece is mainly used for accelerating the propagation speed of the flame explosion flame of premixed combustible gas in the explosion pulse shock wave generator, shortening the burnout time of the flame accelerating piece and further improving the explosion strength and the compression shock wave strength generated by explosion.

Further, the flame acceleration member is a spiral member having a spiral shape as a whole.

Preferably, the flame accelerator is a screw member integrally provided in an archimedes spiral.

Further, the screw is a tubular screw or a plate screw.

Further, the flame accelerator is an annular plate arranged between the igniter and the gas outlet in the explosion pulse shock wave generator; a through hole is formed in the middle of the annular plate; the aperture ratio of the annular plate is 30% -60%. The area of the through hole is 30% -60% of the area of the outer circle of the annular plate.

The outer circle of the annular plate is fixedly connected with the inner side wall of the explosion pulse shock wave generator in a welding mode and the like.

Further, a reinforcing rib is arranged between the annular plate and the explosion pulse shock wave generator.

Further, the number of the annular plates is one or a plurality of annular plates.

Wherein, a plurality of annular plates are arranged at intervals between the igniter and the gas outlet.

Further, the pulse valve includes: the valve comprises a valve body, a valve core (or called a valve clack) and an executing mechanism; a gas flow passage is arranged in the valve body, and the valve core can be movably arranged; the actuating mechanism is used for driving the valve core to be inserted into or withdrawn from the gas flow passage so as to close or open the gas flow passage; a valve seat structure matched with the valve core is arranged in the valve body; the valve seat structure and the valve core are provided with sealing structures made of soft sealing materials or hard sealing materials.

The sealing structure can be a sealing gasket or a sealing ring and the like.

Further, the soft sealing material is rubber, carbon fiber packing or asbestos fiber packing.

Further, the sealing structure is a sealing gasket or a sealing ring made of rubber; or the sealing structure is a carbon fiber packing ring or an asbestos fiber packing ring.

Preferably, the rubber is silicon rubber or mixed rubber mainly comprising silicon rubber; or fluororubber or mixed rubber mainly containing fluororubber; or Ethylene Propylene Diene Monomer (EPDM) or a rubber compound mainly comprising EPDM.

Preferably, the hard sealing material is brass or an aluminum alloy.

Further, the actuating mechanism is an electromagnetic, electric, pneumatic or hydraulic actuating mechanism. Correspondingly, the pulse valve is an electromagnetic pulse valve, an electric pulse valve, a pneumatic pulse valve or a hydraulic pulse valve.

Further, an in-place sensor for monitoring the opening and closing state of the gas channel or an opening sensor for monitoring the opening of the gas channel is arranged on the valve body.

Further, the device also comprises a purge gas pipeline, wherein the purge gas pipeline is communicated with the explosion pulse shock wave generator and is used for introducing purge gas into the explosion pulse shock wave generator and purging high-temperature gas generated by internal explosion of the explosion pulse shock wave generator.

Further, the device comprises a plurality of purge gas pipelines for introducing a plurality of purge gases into the explosion pulse shock wave generator.

Further, a purge gas inlet used for being connected with the purge gas pipeline is arranged on the explosion pulse shock wave generator, and the purge gas inlet is arranged at one end, far away from the gas outlet, of the explosion pulse shock wave generator.

Further, the device also comprises a fuel gas pipeline and an oxidant gas pipeline, wherein the fuel gas pipeline and the oxidant gas pipeline are communicated with a gas inlet on the explosion pulse shock wave generator and are used for respectively introducing fuel gas and oxidant gas into the explosion pulse shock wave generator.

Further, an on-off valve and/or a check valve is arranged on the purge gas pipeline, the fuel gas pipeline or the oxidant gas pipeline.

Further, the purge gas pipeline, the fuel gas pipeline or the oxidant gas pipeline is provided with a plurality of on-off valves arranged in series and/or a plurality of check valves arranged in series.

Further, the on-off valve is an electromagnetic valve, an electric valve or a pneumatic valve;

or, the on-off valve is a hard sealing valve.

Wherein the explosion pulse shock wave generator is in the shape of a sphere, a cylinder and the like. The cylinder body can be in the shape of a cylinder, a straight cylinder or a non-straight cylinder; the non-straight cylinder comprises a cylinder body which is L-shaped, Z-shaped or n-shaped as a whole.

Further, a gas distribution pipe is arranged in the blasting pulse shock wave generator; the whole explosion pulse shock wave generator is cylindrical, and the gas distribution pipe is arranged on the central axis of the cylinder along the length direction of the cylinder; the two ends of the air distribution pipe are closed, and a plurality of air distribution holes are distributed on the circumference of the air distribution pipe;

the fuel gas pipeline and the oxidant gas pipeline are respectively communicated with the gas distribution pipe; the fuel gas and the oxidant gas are respectively sprayed through the air distribution holes and dispersed in the explosion pulse shock wave generator, and are further mixed to form the combustible premixed gas; or the fuel gas and the oxidant gas are mixed in the gas distribution pipe and then are sprayed into the explosion pulse shock wave generator through the gas distribution hole.

Further, the radial included angle between the central axis of the air distribution hole and the air distribution pipe is not smaller than 15 degrees. Namely, the gas spraying direction from the gas distribution holes and the radial direction of the gas distribution pipe form an included angle for distribution.

Further, the included angle is 30 °.

Further, the explosion pulse shock wave generator is a straight cylinder, and the gas distribution pipe is a straight pipe.

Further, the shock wave conduit is submerged, the inner side end of the shock wave conduit stretches into the explosion pulse shock wave generator, and the outer side end of the shock wave conduit serves as the gas outlet to stretch out of the explosion pulse shock wave generator;

The shock wave guide pipe is used as a valve body of the pulse valve, and the valve seat structure is arranged at the inner side end of the shock wave guide pipe;

the actuating mechanism is a telescopic mechanism, the telescopic end of the telescopic mechanism stretches into the explosion pulse shock wave generator, the valve core is arranged on the telescopic end and is close to or far away from the valve seat structure under the driving of the telescopic mechanism, and then the inner side port of the shock wave guide tube is closed and opened, namely the pulse valve is opened and closed.

Further, the valve core is a sealing cover plate arranged on the telescopic end of the telescopic mechanism.

Further, the explosion pulse shock wave generator is in a straight tube shape, and the shock wave guide tube is a straight tube.

Further, the shock wave catheter passes through the gas distribution pipe and is coaxially arranged with the gas distribution pipe, and an annular cylindrical cavity is surrounded between the shock wave catheter and the gas distribution pipe.

Further, the device also comprises a pressure monitoring device for monitoring the gas pressure in the explosion pulse shock wave generator.

Optionally, the pressure monitoring device is a pressure gauge, a pressure switch, a pressure transmitter or a pressure sensor; and the pressure gauge is preferably an oil filled vibration resistant pressure gauge. The number of the pressure monitoring devices can be one or more according to the needs, and the types of the pressure monitoring devices can be one or more according to the needs.

By adopting the technical scheme, the utility model not only can improve the strength of the blasting impact wave by a plurality of times, but also can improve the energy of blasting soot blowing by a plurality of times on the premise of keeping the volume of the pulse shock wave generator unchanged, thereby obtaining the following beneficial effects:

first, it is easy to increase the soot blowing impact force several times, so that it is possible to blow off the relatively refractory high temperature molten semi-molten viscous soot, various weak viscous soot, various wet soot, various plate-made soot, and more serious soot, etc., more widely applicable soot types and boiler types.

Secondly, the effective space soot blowing range can be easily enlarged by several times, so that the number of the blasting pulse shock wave soot blowing points of the whole boiler can be greatly reduced, the number of the blasting pulse shock wave soot blower equipment parts of the whole boiler can be greatly reduced, the system reliability of the blasting pulse shock wave soot blower of the whole boiler can be greatly improved, and the price of the blasting pulse shock wave soot blower of the whole boiler can be reduced to a certain extent.

Thirdly, the soot blowing impact force can be easily improved by several times, the effective space soot blowing range can be enlarged by several times, and the soot blowing effect can be fundamentally and greatly improved.

Fourth, because of the three points, the method is expected to be well used for large coal-fired boilers with unit capacity of 300MW and above and which are not suitable for the use of explosion pulse shock wave soot blowers due to the fact that the flue size is too large in the past, so that the method replaces the existing method that the most long telescopic steam soot blowers are used for the boilers, various defects of the long telescopic steam soot blowers can be avoided, and the soot blowing cost of the boilers can be greatly reduced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic structural diagram of embodiment 1 provided by the present utility model;

FIG. 2 is a schematic structural diagram of embodiment 2 provided by the present utility model;

FIG. 3 is a schematic structural view of embodiment 3 provided by the present utility model;

FIG. 4 is a schematic structural view of embodiment 4 provided by the present utility model;

FIG. 5 is a schematic structural view of embodiment 5 provided by the present utility model;

FIG. 6 is a schematic cross-sectional view A-A of FIG. 5;

FIG. 7 is a schematic structural diagram of embodiment 6 provided by the present utility model;

FIG. 8 is a schematic cross-sectional view of B-B of FIG. 7;

fig. 9 is a schematic structural diagram of a seal valve core in embodiment 7 provided by the present utility model;

fig. 10 is a schematic structural diagram of a sealing valve core in embodiment 8 provided by the utility model.

Reference numerals:

100-explosion pulse shock wave generator; 101-a purge gas access tube; 102-a fuel gas inlet pipe; 103-an oxidant gas inlet pipe; 104-a gas inlet; 105-gas outlet; 106-outlet pipe elbow; 107-outlet stub; 110-flame accelerator; 111-reinforcing rib plates; 120-gas distribution pipe; 121-air holes are distributed; 122-a gas distribution pipe fixing plate; 130-installing an access port short tube; 131-a flange; 132-a flange cover; 200-pulse valve; 210-cylinder; 220-cylinder rod; 230-sealing the cover plate; 231-soft sealing circular plate; 232-soft sealing packing ring; 240-opening sensor; 310-purge gas line; 311-purge gas on-off valve; 312-purge gas check valve; 320-fuel gas line; 321-a fuel gas on-off valve; 322-fuel gas check valve; 330-an oxidant gas line; 331-an oxidant gas on-off valve; 332-oxidizer gas check valve; 340-a pressure monitoring device; 350-igniter; 400-shock tube.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The utility model is further illustrated with reference to specific embodiments.

Example 1

As shown in fig. 1, the pressure explosion pulse shock wave soot blower provided in this embodiment mainly includes an explosion pulse shock wave generator 100, a pulse valve 200 and a shock wave conduit 400.

The explosive pulse shock wave generator 100 has a volume of 0.08m ³ A spherical container with a gas outlet 105, the gas outlet 105 is a short pipe, and the outer diameter of the short pipe is phi 159mm; a gas inlet 104 is provided on the opposite side of the gas outlet 105, the gas inlet 104 being in the form of a short tube, the short tube of the gas inlet 104 having an outer diameter of phi 57mm.

A flame accelerator 110 is disposed within the blast pulse shock generator 100 and between the gas inlet 104 and the gas outlet 105. In this embodiment, the flame accelerator 110 is a 2 spiral tube with opposite spiral directions, and the overall shape of the spiral tube approximates an archimedes spiral. The 2 flame accelerators 110 are arranged end-to-end staggered between the gas inlet 104 and the gas outlet 105.

In this embodiment, the pulse valve 200 is a pneumatic pulse valve, the shock tube 400 is a seamless steel tube, and the nominal diameters of the pulse valve and the shock tube are DN150mm; the gas outlet 105 is connected to the pulse valve 200 and the shock tube 400 in this order.

The shock tube 400 has an igniter 350 disposed thereon.

When the blowing is performed, the pulse valve 200 is closed, and then the equivalent ratio of the combustible premixed gas is injected into the blast pulse shock wave generator 100 through the gas inlet 104, when the pressure of the combustible premixed gas in the blast pulse shock wave generator reaches a certain value (for example, reaches 0.3 Mpa), the pulse valve 200 is opened and controlled by a control system or a controller (not shown), the combustible premixed gas is ignited by the igniter 350 immediately after the time reaches the time required for opening the blast pulse shock wave generator, and the blast flame is instantaneously transmitted in the front and back directions, so that the combustible premixed gas in the blast pulse shock wave generator 100, in the pulse tank 200 and already flushed into the shock wave guide pipe 400 is detonated, and a compression shock wave is generated and guided into the boiler through the shock wave guide pipe 400 for blowing the dust.

After detonation, a purge gas may also be introduced into the detonation pulse shock generator 100 through the gas inlet 104 to purge out the high temperature gases generated by the detonation.

The main function of the flame accelerator 110 is to accelerate the propagation speed of the flame of the premixed combustible gas in the explosion pulse shock wave generator 100, shorten the burn-out time, and further improve the explosion strength and the compression shock wave strength generated by the explosion.

In this embodiment, the flame accelerator 110 may also be a spiral plate having the same spiral shape.

In this embodiment, the igniter 350 may also be disposed on an injection device (not shown) or on an injection pipe (not shown) that injects the combustible premix gas into the blast pulse shock generator 100.

Example 2

As shown in fig. 2, this embodiment is substantially the same as embodiment 1, except for the following:

in this embodiment, two gas inlets 104 are provided; the two gas inlets 104 are connected to a fuel gas line 320 and an oxidant gas line 330, respectively.

The fuel gas pipeline 320 is connected with a fuel gas on-off valve 321 in series, and the oxidant gas pipeline 330 is connected with an oxidant gas on-off valve 331 in series, wherein the fuel gas on-off valve 321 and the oxidant gas on-off valve 331 are optionally manual stop valves.

The pressure monitoring device 340 is mounted on the gas outlet 105 (i.e. the outlet short pipe) for monitoring the pressure value in the explosion pulse shock wave generator 100, and the pressure monitoring device 340 in this embodiment is specifically an oil-filled vibration-resistant pressure gauge.

Specific example (1) of a soot blowing method of the pressure explosion pulse shock wave soot blower of the present embodiment:

firstly, selecting fuel gas and oxidant gas, for example, selecting bottled dissolved acetylene as fuel gas, and adjusting the air supply pressure to 0.05Mpa; the oxidant gas is compressed air with air pressure regulated to 0.575MPa. Then starting blasting and soot blowing, wherein the basic soot blowing flow of blasting once is as follows:

The first step: manually checking the on-off state of the pulse valve 200, closing if the pulse valve is in the on state, and turning to the next step if the pulse valve is in the off state;

secondly, manually opening a fuel gas on-off valve 321, introducing acetylene gas into the explosion pulse shock wave generator 100, and closing the fuel gas on-off valve 321 after the pressure in the explosion pulse shock wave generator 100 reaches the gas supply pressure of 0.05Mpa of the acetylene gas;

third, the oxidant gas on-off valve 331 is opened manually, compressed air is introduced into the explosion pulse shock wave generator 100, after the gauge pressure of the pressure gauge reaches the air supply pressure of 0.575Mpa, the oxidant gas on-off valve 331 is closed, at this time, the ratio of acetylene and air in the explosion pulse shock wave generator 100 is just 1:12.5, and normal pressure air is arranged in the explosion pulse shock wave generator before the acetylene gas is introduced. Mixing the mixture with acetylene gas which is firstly introduced through the flow and molecular diffusion of compressed air;

fourth, the igniter 350 is manually turned on to start discharging;

fifth, the pulse valve 200 is manually started to be opened instantly, and the flushed acetylene-air premixed gas is detonated by the igniter 350 which is discharging;

sixth, the igniter 350 is manually powered off.

Specific example (2) of a soot blowing method of the pressure explosion pulse shock wave soot blower of the present embodiment:

firstly, selecting fuel gas and oxidant gas, wherein the fuel gas is bottled to dissolve acetylene, and the air supply pressure is adjusted to be 0.2Mpa; the oxidant gas is bottled oxygen, and the air supply pressure is regulated to be 0.69Mpa.

Then starting blasting and soot blowing, wherein the basic soot blowing flow of blasting once is as follows:

first, manually checking the on-off state of the pulse valve 200, closing if the pulse valve is in the on state, and entering the next step if the pulse valve is in the off state;

secondly, manually opening a fuel gas on-off valve 321, introducing acetylene gas into the explosion pulse shock wave generator 100, and closing when the gauge pressure of the pressure gauge reaches 0.2Mpa;

and thirdly, manually opening an oxidant gas on-off valve 331, introducing oxygen into the blasting pulse shock wave generator 100, mixing the oxygen with the acetylene gas which is introduced firstly through flowing and molecular diffusion while introducing the oxygen, and closing the furnace after the gauge pressure of the pressure gauge reaches the air supply pressure of 0.69Mpa. At this time, the chemical equivalent ratio (molar ratio) of acetylene and oxygen in the explosion pulse shock wave generator 100 is just 1:2.5, and normal pressure air is arranged in the explosion pulse shock wave generator before the acetylene gas is introduced;

fourth, the igniter 350 is manually turned on to start continuous discharge;

Fifth, the pulse valve 200 is manually started to be opened instantly, and the flushed acetylene-oxygen premixed gas is detonated by the igniter 350 which is discharging;

sixth, the igniter 350 is manually powered off.

On the basis of the above basic soot blowing flow, this embodiment may be further optimized by waiting a short period of time, for example, 60 seconds, after the third step is completed and before the fourth step is started, so that the acetylene gas and air in the burst pulse shock generator 100 are further uniformly mixed by molecular diffusion.

In this embodiment, the pressure explosion pulse shock wave soot blower may further include a controller, the fuel gas on-off valve 321 and the oxidant gas on-off valve 331 may also be replaced by an electric hard sealing ball valve, and the pressure gauge may also be replaced by a pressure sensor, so that the soot blowing flow may be controlled by manual control instead of full automatic control.

Example 3

As shown in fig. 3, the pressure explosion pulse shock wave soot blower provided in this embodiment mainly includes an explosion pulse shock wave generator 100, a pulse valve 200, a purge gas pipeline 310, a fuel gas pipeline 320, an oxidant gas pipeline 330, a pressure monitoring device 340 and an igniter 350. The pulse valve 200 is connected to the boiler by a shock tube (not shown in fig. 3). One end of the purge gas line 310, the fuel gas line 320, and the oxidizer gas line 330 are connected to the same gas inlet 104.

The other ends of the purge gas line 310, the fuel gas line 320, and the oxidizer gas line 330 are connected to a purge gas source, a fuel gas source, and an oxidizer gas source, respectively.

The explosion pulse shock wave generator 100 is provided with elliptical sealing heads welded at two ends and has a volume of 0.12m ³ Is a straight cylindrical container; a gas outlet 105 is provided at the center of one end thereof; the gas outlet 105 is sequentially connected with an outlet pipe elbow 106 and an outlet short pipe 107; the outlet pipe bend 106, outlet stub 107 and stub used as gas outlet 105 all have an outer diameter of Φ219mm.

A gas inlet 104 is arranged at the center of the other end of the blasting pulse shock wave generator 100, and the outer diameter of the gas inlet is phi 32mm; an igniter 350 and a pressure monitoring device 340 are mounted on the wall of the cylinder near one end of the gas inlet 104. In this embodiment, the pressure monitoring device 340 is a pressure transmitter.

The purge gas pipeline 310 is sequentially connected with a purge gas on-off valve 311 and a purge gas check valve 312 in series along the flow direction, the fuel gas pipeline 320 is respectively connected with a fuel gas on-off valve 321 and a fuel gas check valve 322 in series along the flow direction, and the oxidant gas pipeline 330 is respectively connected with an oxidant gas on-off valve 331 and an oxidant gas check valve 332 in series along the flow direction and is connected with the gas inlet 104; the purge gas on-off valve 311, the fuel gas on-off valve 321 and the oxidant gas on-off valve 331 are all solenoid valves; purge gas check valve 312, fuel gas check valve 322, and oxidant gas check valve 332 are all poppet-type check valves.

The pulse valve 200 is an electromagnetic pulse valve, and the nominal diameter DN is 200mm; the outlet nipple 107 is connected to the pulse valve 200.

The present embodiment further includes a PLC control cabinet (not shown) for electrically connecting with the purge gas on-off valve 311, the fuel gas on-off valve 321, the oxidizer gas pipe 331, the pulse valve 200, the igniter 350, and the pressure monitoring device 340.

The soot blowing method of the pressure blasting pulse shock wave soot blower of the embodiment comprises the following steps:

firstly, selecting a purge gas source, a fuel gas and an oxidant gas: the purging air source is compressed air, and the air supply pressure is regulated to 0.2Mpa; the fuel gas is selected from pipeline natural gas, and the gas supply pressure is regulated to 0.4Mpa; the oxidant gas is bottled oxygen, and the air supply pressure is regulated to 0.25Mpa.

Then, starting full-automatic blasting and soot blowing through program control of a PLC control cabinet, wherein the basic soot blowing flow of blasting once is as follows:

the first step, the purge gas on-off valve 311 is powered on and turned off after 10 seconds, and the explosion pulse shock generator 100 is pre-purged;

secondly, the oxidant gas on-off valve 331 is electrified and opened, oxygen is introduced into the blasting pulse shock wave generator 100, and when the pressure in the blasting pulse shock wave generator reaches 0.18Mpa, the blasting is stopped;

third, the fuel gas on-off valve 321 is powered on and opened, natural gas is fed into the blasting pulse shock wave generator 100, and when the pressure reaches 0.28Mpa, the power is off, and at the moment, the chemical equivalent ratio (molar ratio) of the natural gas to the oxygen is about 1:2, and normal pressure air is arranged in the natural gas before the natural gas is fed in);

Fourth, the fuel gas on-off valve 321 waits 2 seconds after being turned off;

fifth, the pulse valve 200 is powered on and opened instantly, the igniter 350 is powered on and ignited after 1 second and is powered off and stopped after 1 second is continued, and the natural gas-oxygen premixed gas in the explosion pulse shock generator 100 and partially flushed is detonated;

sixthly, the purge gas on-off valve 311 is powered on and turned off after 12 seconds, and the explosion pulse shock wave generator 100 is purged after explosion;

seventh, the pulse valve 200 is turned off.

In this embodiment, the check valve and the fourth step of the soot blowing step are important: because the explosion impact power of the pressure combustible premixed gas is very high, the fourth step is set to wait for 2 seconds instead of immediately entering the fifth step after the fuel gas on-off valve 321 is powered off and closed, the check valve is fully automatically closed, and the sweeping gas on-off valve 311, the fuel gas on-off valve 321 and the oxidant gas on-off valve 331 can be protected from being subjected to strong impact during ignition and explosion basically.

Example 4

As shown in fig. 4, this embodiment is almost identical to embodiment 3, except that: the blast pulse shock generator 100 in this embodiment is an L-shaped cylindrical vessel.

Example 5

As shown in fig. 5 to 6, this embodiment is substantially the same as embodiment 3, except that:

in this embodiment, the inner length of the cylinder of the explosion pulse shock wave generator 100 is about three times of the inner diameter thereof, and the flame accelerator 110 is disposed therein, in this embodiment, the flame accelerator 110 is two annular plates, the outer diameter of which is slightly smaller than the inner diameter of the cylinder of the explosion pulse shock wave generator 100, and the two annular plates are respectively fixed at the positions of about one third and two thirds of the length of the explosion pulse shock wave generator 100 by welding.

The middle of the annular plate is provided with a through hole, the open area of the through hole is about 50% of the internal cross section area of the cylinder of the explosion pulse shock wave generator 100, namely, the area of the through hole is 50% of the area of the outer circle of the annular plate. In order to strengthen the anti-detonation impact performance, reinforcing rib plates 123 are welded between the annular plates and the inner side walls of the detonation pulse shock generator 100.

And, a gas distribution pipe 120 is further provided in the explosion pulse shock generator 100. The two ends of the gas distribution pipe 120 are closed, and the gas distribution pipe 120 is welded and fixed on gas distribution pipe fixing plates 122 at the two ends and is coaxial with the central line of the length direction of the explosion pulse shock wave generator 100, a plurality of gas distribution holes 121 are uniformly formed on the circumferential surface of the gas distribution pipe 120, and the central line of the gas distribution holes 121 forms an included angle of about 25 degrees with the normal line of the circumferential surface at the same point, so that tangential flow velocity components are generated when gas is introduced to drive the gas to rotate, and the gas is distributed and mixed more uniformly. A fuel gas access pipe 102 and an oxidant gas access pipe 103 are symmetrically and externally connected to the outside of the side wall of the explosion pulse shock wave generator 100 at the middle part of the length of the gas distribution pipe 120; the fuel gas supply pipe 102 and the oxidizing gas supply pipe 103 are connected as two gas inlets 104 to a fuel gas line 320 and an oxidizing gas line 330, respectively.

Specifically, the fuel gas pipe 320 is connected to the fuel gas inlet pipe 102, and the oxidizing gas pipe 330 is connected to the oxidizing gas inlet pipe 103. The purge gas line 310 is connected to a gas inlet 104 at the top of the blast pulse shock generator 100. The fuel gas and the oxidant gas flow into the gas distribution pipe 120 through the fuel gas inlet pipe 102 and the oxidant gas inlet pipe 103, respectively, and are then injected into the explosion pulse shock generator 100 through the gas distribution holes 121.

In this embodiment, the purge gas on-off valve 311, the fuel gas on-off valve 321 and the oxidant gas on-off valve 331 are connected in series by two valves, and the first valve adopts an electromagnetic valve along the flow direction, and the second valve adopts a hard sealing electric plug valve. Purge gas check valve 312, fuel gas check valve 322, and oxidant gas check valve 332 are all changed to swing check valves;

and, both the pressure monitoring device 340 and the igniter 350 are retrofitted to the top elliptical head. The present embodiment is also provided with an opening sensor 240 for monitoring the opening of the pulse valve 200.

In addition, the embodiment further includes a DCS control on-site wiring closet, and the DCS control on-site wiring closet is electrically connected to the two purge gas on-off valves 311, the two fuel gas on-off valves 321, the two oxidant gas on-off valves 331, the pulse valve 200, the igniter 350, and the pressure monitoring device 340, respectively.

The soot blowing method of the pressure blasting pulse shock wave soot blower of the embodiment comprises the following steps:

firstly, selecting fuel gas, oxidant gas and purge gas, wherein the fuel gas is pipeline natural gas, and the gas supply pressure is regulated to 0.3Mpa; the oxidant gas is compressed air, the air supply pressure is regulated to 0.8Mpa, the purge air gas is compressed air, and the air supply pressure is regulated to 0.3Mpa.

Then, the DCS control is used for program control through the DCS control on-site wiring cabinet, full-automatic blasting and soot blowing is started, and the basic soot blowing flow of blasting once is as follows:

the first step, two purge gas on-off valves 311 are powered on and turned off completely after 10 seconds, and pre-purge is performed on the explosion pulse shock generator 100;

secondly, two fuel gas on-off valves 321 are electrified and opened, natural gas is introduced into the blasting pulse shock wave generator 100, and when the pressure in the blasting pulse shock wave generator reaches 0.06Mpa, all the fuel gas on-off valves are powered off and closed;

thirdly, the two oxidant gas on-off valves 331 are electrified and opened, compressed air is introduced into the blasting pulse shock wave generator 100, and when the pressure in the blasting pulse shock wave generator reaches 0.5Mpa, all the blasting is closed, at the moment, the chemical equivalent ratio of the natural gas to the air in the blasting pulse shock wave generator is about 1:10 (the molar ratio is that normal pressure air exists in the blasting pulse shock wave generator before the blasting pulse shock wave generator is introduced), and the blasting pulse shock wave generator is well mixed;

Fourth, when the pulse valve 200 is powered on and instantly opened and the opening sensor 240 detects that the opening reaches 60%, the igniter 350 is powered on and ignites (after 1 second, the power is cut off and stopped), and the natural gas-air premixed gas in the explosion pulse shock wave generator 100 and partially flushed is detonated;

fifthly, two purge gas on-off valves 311 are powered on and turned off after 15 seconds, and the explosion pulse shock wave generator 100 is purged after explosion;

sixth, the pulse valve 200 is turned off.

In the above-mentioned basic soot blowing process, since the compressed air is adopted as the oxidant gas, the on-off valve 331 of the oxidant gas may be used to purge the gas on-off valve 311 in the first step and the fifth step, and the on-off valve 331 of the oxidant gas and the on-off valve 311 of the purge gas may be used to purge the gas simultaneously.

In this embodiment, the purge gas on-off valve 311, the fuel gas on-off valve 321 and the oxidant gas on-off valve 331 are all connected in series by using double valves, which is beneficial to improving the reliability of turn-off, and the second valve has a protection effect on the first valve along the flow direction. In addition, the second valve adopts a hard sealing valve, so that the anti-explosion impact performance is better.

Example 6

As shown in fig. 7-8, in this embodiment:

The explosion pulse shock wave generator 100 is a straight cylindrical container with elliptical end sockets welded at two ends, the outer diameter phi is 426mm, and the volume is about 0.15m ³ 。

At its inner length center, shock tube 400 is submerged and shock tube 400 has an outer diameter of Φ180mm.

The inner side end of the shock tube 400 extends into the explosion pulse shock generator 100, and the outer side end of the shock tube 400 extends out of the explosion pulse shock generator 100 as the gas outlet 105; the shock tube 400 is used as a valve body of the pulse valve 200, and a valve seat structure is arranged at the inner side end of the shock tube 400; the actuating mechanism is a cylinder 210, a cylinder rod 220 (i.e. a telescopic end) of the cylinder 210 extends into the explosion pulse shock wave generator 100, a sealing cover plate 230 is arranged on the cylinder rod 220 as a valve core, and is close to or rapidly far away from the valve seat structure under the driving of the cylinder 210, so that the inner side port of the shock wave conduit 400 is closed and rapidly opened, namely the pulse valve 200 is closed and rapidly opened.

At the center of the upper elliptical head of the explosion pulse shock generator 100, a mounting access hole is formed, and a short pipe 130 for mounting access hole, a sealing flange 131 and a flange cover 132 are provided. The cylinder 210 is arranged on the middle outer side of the flange cover 132, the cylinder rod 220 of the cylinder is extended into the pulse shock wave generator 100 through a through hole on the flange cover 132, the tail end of the cylinder rod 220 is provided with a sealing cover plate 230, and the diameter of the sealing cover plate 230 is larger than the outer diameter of the pulse conduit 400; the inlet of the pulse conduit 400 is also the valve port of the pulse valve 200, and when the cylinder rod 220 drives the sealing cover plate 230 to be pressed down, the pulse valve is closed, otherwise, the pulse valve is opened. The pulse valve 200 is further provided with an opening sensor 240.

Outside the shock wave conduit 400, a gas distribution pipe 120 with two closed ends is sleeved, the outer diameter phi 219mm of the gas distribution pipe is approximately and uniformly distributed with a plurality of gas distribution holes 121 on the circumferential surface, and the included angle between the central line of the gas distribution holes 120 and the normal line of the circumferential surface at the same point is about 20 degrees, so that tangential flow velocity components are generated when gas is introduced to drive the gas to rotate, and the gas is distributed and mixed more uniformly. A fuel gas inlet pipe 102 and an oxidant gas inlet pipe 103 are symmetrically and outwardly connected at the approximate middle part of the length direction of the gas distribution pipe 120, and are bent and upwards extended from an upper elliptical head of the explosion pulse shock wave generator 100. In addition, four gas distribution pipe fixing plates 122 uniformly distributed along the circumference are welded near the upper end of the gas distribution pipe 120, one end of each gas distribution pipe fixing plate is welded on the outer wall of the gas distribution pipe 120, and the other end of each gas distribution pipe fixing plate is welded on the inner wall of the cylinder of the explosion pulse shock wave generator 100.

The flame accelerator 110 is also arranged in the explosion pulse shock wave generator 100, specifically 1 annular plate, the outer diameter of which is slightly smaller than the inner diameter of the cylinder of the explosion pulse shock wave generator 150, a through hole is arranged in the middle of the annular plate, the open area of the through hole is about 55% of the inner cross section area of the cylinder of the explosion pulse shock wave generator 150, the through hole is welded at the position of about half the length of the explosion pulse shock wave generator 100, and 8 triangular reinforcing rib plates 111 uniformly distributed along the circumference are welded on one surface of the through hole for enhancing the anti-explosion impact performance of the explosion pulse shock wave generator. In addition, a pressure monitoring device 340, specifically a pressure transmitter, is also installed on the upper side wall of the explosion pulse shock generator 100.

An air distribution plate 140 is arranged in the inner cavity of the elliptical end socket at the lower end of the explosion pulse shock wave generator 100, and a plurality of air distribution holes which are approximately and uniformly arranged are processed on the air distribution plate 140. An igniter 350 is further mounted on the elliptical head, and a purge gas inlet pipe 101 is welded thereto.

The purge gas pipe 310 is connected with the purge gas inlet pipe 101, the fuel gas pipe 320 is connected with the fuel gas inlet pipe 102, and the oxidant gas pipe 330 is connected with the oxidant gas inlet pipe 103; in the flow direction, the purge gas pipeline 310 is sequentially connected with a purge gas on-off valve 311 and a purge gas check valve 312 in series, the fuel gas pipeline 320 is sequentially connected with a fuel gas on-off valve 321 and a fuel gas check valve 322 in series, and in order to improve reliability and safety, the on-off valves and the check valves are connected in series by double valves, the first on-off valve adopts an electromagnetic valve in the flow direction, the second on-off valve adopts a hard sealing electric plug valve, the first check valve adopts a swing check valve, and the second check valve adopts a lifting check valve.

The embodiment further comprises an upper computer, and the upper computer and the PLC program control system are respectively electrically connected with the two purge gas on-off valves 311, the two fuel gas on-off valves 321, the two oxidant gas pipes 331, the pulse valve 200, the igniter 350 and the pressure transmitter.

The soot blowing method of the pressure blasting pulse shock wave soot blower of the embodiment comprises the following steps:

firstly, selecting fuel gas, oxidant gas and purge gas, wherein the fuel gas is bottled to dissolve acetylene, and the air supply pressure is regulated to 0.1Mpa; the oxidant gas is bottled oxygen, the air supply pressure is regulated to 0.2Mpa, the purge gas is compressed air, and the air supply pressure is regulated to 0.35Mpa.

Then, by the control of the upper computer and the PLC program control system, full-automatic blasting and soot blowing is started, and the basic soot blowing flow of blasting once is as follows:

the first step, two blowing air on-off valves 311 are powered on and turned off after 12 seconds, and the blasting pulse shock wave generator 100 is pre-blown;

secondly, two fuel gas on-off valves 321 are electrified and opened, acetylene gas is introduced into the blasting pulse shock wave generator 100, and when the pressure in the acetylene gas reaches 0.06Mpa, all the acetylene gas is powered off and closed;

third, the two oxidant gas on-off valves 331 are electrified and opened, oxygen is introduced into the blasting pulse shock wave generator 100, and when the pressure reaches 0.2Mpa, all the power is cut off, and at the moment, the chemical equivalent ratio (molar ratio) of acetylene and oxygen in the blasting pulse shock wave generator is just about 1:2.5, and normal pressure air is arranged in the blasting pulse shock wave generator before natural gas is introduced;

Fourth, the oxidant gas on-off valve 331 is closed after being powered off and waits for 10 seconds;

fifth, the pulse valve 200 is powered on and opened instantly, and when the opening reaches one half of the opening, the igniter 350 is powered on and ignited (after 1 second, the power is cut off and stopped), and the acetylene-oxygen premixed gas in the explosion pulse shock wave generator 100 and partially flushed out is detonated;

sixthly, two purge air on-off valves 311 are powered on and turned off after 12 seconds, and the explosion pulse shock wave generator 100 is purged after explosion;

seventh, the pulse valve 200 is turned off.

Example 7

This embodiment is substantially the same as embodiment 6 except that:

as shown in fig. 9, the sealing cover plate 230 has a soft sealing structure on the shock wave tube 400 side, the soft sealing material is a soft sealing circular plate 231, and the material of the soft sealing circular plate 231 is Ethylene Propylene Diene Monomer (EPDM).

Example 8

This embodiment is substantially the same as embodiment 6 except that:

as shown in fig. 10, the sealing cover plate 230 is provided with a soft sealing element at one side of the shock tube 400, the soft sealing element is a soft sealing packing ring 232, and the main material of the soft sealing packing ring 232 is carbon fiber.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (26)

1. A pressure burst pulse shock wave sootblower, comprising: the device comprises a blasting pulse shock wave generator, a pulse valve, an igniter and a shock wave guide tube;

the explosion pulse shock wave generator is a container for containing combustible premixed gas with set pressure;

the explosion pulse shock wave generator comprises a gas outlet, the gas outlet is connected with the boiler sequentially through a pulse valve and a shock wave conduit, and the igniter is arranged on the explosion pulse shock wave generator, the pulse valve or the shock wave conduit and used for igniting the combustible premixed gas so as to perform soot blowing operation on the boiler by utilizing shock waves formed by explosion of the combustible premixed gas.

2. The soot blower of claim 1, wherein said blast pulse shock generator is provided with a gas inlet connected to a gas source for introducing said combustible premixed gas into said blast pulse shock generator;

or, the explosion pulse shock wave generator is provided with a plurality of gas inlets, and the plurality of gas inlets are respectively connected with a plurality of gas sources and are used for respectively introducing a plurality of gases into the explosion pulse shock wave generator, and the plurality of gases are mixed to form the combustible premixed gas.

3. The sootblower of claim 1 wherein said igniter is mounted within said blast pulse shock generator at an end remote from a gas outlet of the blast pulse shock generator.

4. The soot blower of claim 1, wherein a flame accelerator is disposed within the burst pulse shock generator, one end of the flame accelerator is disposed proximate to the igniter, and the other end of the flame accelerator is disposed proximate to the burst pulse shock generator gas outlet for increasing the turbulence of the flame within the burst pulse shock generator and thereby increasing the propagation velocity of the flame within the burst pulse shock generator.

5. The sootblower of claim 4 wherein said flame accelerator is a helical member that is generally helically shaped.

6. The sootblower of claim 4 wherein said flame acceleration member is a screw member integrally disposed in an archimedean spiral.

7. The sootblower of claim 5 or 6 wherein said screw is a tubular screw or a plate screw.

8. The sootblower of claim 4 wherein said flame accelerator is an annular plate disposed within said burst pulse shock generator between said igniter and said gas outlet; a through hole is formed in the middle of the annular plate; the aperture ratio of the annular plate is 30% -60%.

9. The sootblower of claim 8 wherein said annular plates are one or more in number.

10. The sootblower of claim 1 wherein said pulse valve comprises: the valve comprises a valve body, a valve core and an executing mechanism; a gas flow passage is arranged in the valve body, and the valve core can be movably arranged; the actuating mechanism is used for driving the valve core to be inserted into or withdrawn from the gas flow passage so as to close or open the gas flow passage; a valve seat structure matched with the valve core is arranged in the valve body; the valve seat structure and the valve core are provided with sealing structures made of soft sealing materials or hard sealing materials.

11. The sootblower of claim 10 wherein said valve body is provided with an in-place sensor for monitoring an open-closed state of said gas flow passage or an opening sensor for monitoring an opening of said gas flow passage.

12. The soot blower of claim 1, further comprising a purge gas line in communication with said blast pulse shock generator for introducing a purge gas into said blast pulse shock generator for purging high temperature gases generated by the blast within said blast pulse shock generator.

13. The sootblower of claim 12 comprising a plurality of said purge gas lines for introducing a plurality of purge gases into said burst pulse shock generator.

14. The sootblower of claim 12 wherein said blast pulse shock generator is provided with a purge gas inlet for connection to said purge gas conduit, said purge gas inlet being provided at an end of said blast pulse shock generator remote from said gas outlet.

15. The sootblower of claim 12 further comprising a fuel gas line and an oxidant gas line in communication with a gas inlet on said blast pulse shock generator for introducing fuel gas and oxidant gas into the blast pulse shock generator, respectively.

16. The sootblower of claim 15 wherein said purge gas line, said fuel gas line, or said oxidant gas line is provided with an on-off valve and/or a check valve.

17. The sootblower of claim 16 wherein said purge gas line, said fuel gas line, or said oxidant gas line is provided with a plurality of on-off valves and/or a plurality of check valves disposed in series.

18. The soot blower of claim 15, wherein a gas distribution tube is disposed in said burst pulse shock generator; the whole explosion pulse shock wave generator is cylindrical, and the gas distribution pipe is arranged on the central axis of the cylinder along the length direction of the cylinder; the two ends of the air distribution pipe are closed, and a plurality of air distribution holes are distributed on the circumference of the air distribution pipe;

the fuel gas pipeline and the oxidant gas pipeline are respectively communicated with the gas distribution pipe; the fuel gas and the oxidant gas are respectively sprayed through the air distribution holes and dispersed in the explosion pulse shock wave generator, and are further mixed to form the combustible premixed gas; or the fuel gas and the oxidant gas are mixed in the gas distribution pipe and then are sprayed into the explosion pulse shock wave generator through the gas distribution hole.

19. The sootblower of claim 18 wherein a radial angle of a central axis of said air distribution holes to said air distribution tube is no less than 15 °.

20. The sootblower of claim 19 wherein said included angle is 30 °.

21. The sootblower of claim 18 wherein said blast pulse shock generator is a straight cylinder and said gas distribution tube is a straight tube.

22. The sootblower of claim 10 wherein said shock tube is submerged, an inner end of said shock tube extending into said blast pulse shock generator, an outer end of said shock tube extending out of said blast pulse shock generator as said gas outlet;

the shock wave guide pipe is used as a valve body of the pulse valve, and the valve seat structure is arranged at the inner side end of the shock wave guide pipe;

the actuating mechanism is a telescopic mechanism, at least the telescopic end of the telescopic mechanism stretches into the explosion pulse shock wave generator, the valve core is arranged on the telescopic end and is close to or rapidly far away from the valve seat structure under the driving of the telescopic mechanism, and then the inner side port of the shock wave guide tube is closed and rapidly opened, namely the pulse valve is rapidly opened and closed.

23. The sootblower of claim 22 wherein said spool is a sealing cover plate disposed over a telescoping end of said telescoping mechanism.

24. The sootblower of claim 22 wherein said blast pulse shock generator is straight and said shock conduit is straight.

25. The sootblower of claim 18 wherein said shock tube extends through said gas distribution tube coaxially disposed therewith, said shock tube and gas distribution tube defining an annular cylindrical chamber therebetween.

26. The sootblower of claim 1 further comprising pressure monitoring means for monitoring gas pressure within said burst pulse shock generator.