Gas pulse shock wave soot blower

1、 Overview of Gas Shock Wave Blowers

XX-1 gas shock wave soot blower is a new type of advanced industrial boiler soot blowing equipment. It is a substitute product for old-fashioned long pole soot blowers (steam), short pole soot blowers (steam), steel ball soot blowers, infrasonic soot blowers, and large horn mouth soot blowers (sonic).

2、 Product Structure

Gas shock wave soot blower, also known as gas pulse soot blower, is a system composed of shock wave generator, mixing unit, ignition unit, pipeline system, and control unit.

3、 Working principle

By mixing combustible gas (acetylene) with air in a certain proportion to produce characteristic gases, and based on high turbulence and adjustable pulse frequency, burning the mixed gas produces a strong wave jet flowAccompanied by shock waves and thermal radiation, the kinetic energy, acoustic energy, and thermal energy of the gas are comprehensively used for soot blowing. Its characteristics include excellent performance, good economy, reliable operation, and simple operation and maintenance.

1. Mechanical impact effect: After ignition and combustion, the volume of the mixed gas rapidly expands instantly, and with the strengthening of the acceleration device, high pressure (usually 110kg/cm) is generated2）At high speed (300, 350 m/s), it enters the furnace through the nozzle and acts on the surface of the heated surface components in the form of shock waves, which undergo multiple refractions and cause the accumulated dust to fall off and fly. At the same time, the heated surface tube generates micro vibrations, causing the ash layer attached to the surface of the tube to rupture and detach. Its function is similar to mechanical vibration, but its effect is much stronger than mechanical vibration, and its action time is extremely short (millisecond level), without any damage to the heating surface. This effect is particularly suitable for hard layered ash.

2. Hot cleaning function: After ignition and explosion of mixed gas, high-temperature and high-pressure gas is generated. When high-temperature gas is directed towards the ash layer, it can soften the ash and reduce its bonding strength. Under high-pressure airflow, the ash layer will break and fall off. This is particularly effective for the adhesive ash of fuel boilers and industrial waste heat boilers.

3. Acoustic radiation effect: When the explosive gas enters the furnace, it produces a huge sound, which is a manifestation of energy released as sound energy. From the running experiment, it can be seen that the sound pressure level remains above 160dB at a distance of 6-7 meters from the nozzle axis. It propagates radially in all directions towards the furnace, and through the action of sound energy, the surface area of the heating surface in these areas oscillates with the ash layer. Due to the repeated action of sound wave oscillation, the sediment becomes loose, fractures, and eventually falls off.

By designing a gas intelligent pulse soot blowing device system reasonably, air and gas are mixed in a special container, ignited at high frequency, and undergo detonation. The mixed gas rapidly expands, generating high-temperature and high-pressure gas. The gas is strengthened and accelerated in a specially structured tank, forming high-energy gas, and enters the furnace through the nozzle in the form of impact kinetic energy, thermal energy, and sound energy. It acts on the ash layer on the heating surface of the boiler, causing the ash to fall off and be carried out of the furnace by the flue gas. Reasonably design the soot blowing device system and its various components in terms of structure, size, and shape, in order to achieve controllable soot blowing intensity and achieve the desired soot blowing effect.

Scope of use of gas pulse soot blower】

4、 Design and components of the entire equipment system

1. Each component and part is designed strictly in accordance with national standards.

2. Gas and air can be automatically distributed, and the pipelines are designed with five or more levels of check devices. The ignition of premixed gas must be able to meet the initial flame formation and propagation, while not causing backfire or the occurrence of backfire at the fan outlet. The design performance of the combustion chamber must meet the requirements of both rapid flame propagation and accurate and effective control of shock pressure parameters during premixed combustion.

3. The mixed pipeline is short (controlled within 10 meters), effectively preventing safety accidents from occurring; The acetylene content in the mixed gas is controlled within a safe range, and the display instrument accurately displays the value.

4. The entire control system achieves automatic detection of pressure, faults, and gas leaks.

5. This system includes a control system, a hybrid ignition unit, a soot blowing distribution unit, and a soot blowing power unit. Due to the use of acetylene gas as fuel, a combustible gas alarm system is installed on site, and the structural design includes multiple anti backfire measures to ensure safety without fail.

List of Main Component Functions of Gas Shock Wave Blowers

Performance parameter table of main components of soot blower

6. Design principle: Confirm the ash accumulation parameters based on different boiler ash accumulation situations, confirm the environmental parameters based on the boiler ash blowing location, and confirm the installation practicality based on the on-site environment. For various types of boilers and different types of ash deposits, suitable device types can be selected to obtain appropriate pulse energy and achieve optimized configuration.

7. Mixing unit: The mixing unit has the function of mixing gas and air, and also has the function of preventing the backfire of explosive gases.

8. Ignition unit: The main body is a sealed tank, which is equipped with a high-energy igniter and anti backflow device insideThe fire structure and drainage device are designed with a safety factor of 8-10 times.

The high-energy igniter adopts high-end aviation and aerospace technology, which has the characteristics of high output voltage, large spark energy, anti pollution, no carbon deposition, high temperature resistance, strong self-cleaning ability, and continuous discharge, ensuring ignition quality. Ensure 50000 successful ignitions without any malfunctions. Overcoming the disadvantages of low ignition energy, easy carbon deposition, and short service life of spark plugs.

High energy igniter】:

9. Shock wave generator: an open container used for the expansion of high-energy gases and the concentration and release of soot blowing gas energy, and is the main soot blowing component. A pulse generator is a tank for pre mixed gas combustion, used to organize and accelerate the combustion process, establish high turbulence paths, modulate, and emit shock waves. The pulse generator consists of a tank separated by a steady flow baffle and is connected to the mixed ignition device through a mixed gas duct (flame duct). Ensure uniform gas mixing, sufficient ignition, and effective energy utilization. The functions of accumulating soot blowing energy, causing detonation, and modulating the emission of shock waves are all completed by a pulse generator, which repeatedly withstands the action of pulse pressure. Although it is an open container, it is also designed, manufactured, and inspected in accordance with the pressure vessel standard (GBl5098 Steel Pressure Vessels).

10. Shock wave nozzle: used to control the airflow direction of detonation shock waves. The conventional method is a 45 degree oblique cut for circular pipes0600Poor directionality. The shock wave nozzle adopts a directional curved nozzle with a large diffusion range, which effectively utilizes the energy of the shock wave and ensures the safety of the furnace body. The shock wave nozzle is a key component of the soot blower, and the shock wave propagates in the form of a spherical wave along the normal direction of the nozzle outlet. In order to effectively apply its energy to the ash accumulation heating surface and reduce the impact on the furnace wall, the shock wave nozzle adopts a directional curved nozzle.

11. Gas control system: The system mainly consists of gas pipelines, gas collection boxes, pressure gauges, gas leak alarms, flame arresters, cabinets, and equipped valves. All valves are tightly closed, flexibly opened, and tightly fitted to ensure no leakage.

12. Control unit: The control system can achieve real-time adjustment of air flow rate, acetylene gas flow rate, and blowing parameters (such as inflation time, pulse frequency, pulse sequence, etc.). Control the ignition signal, adjust the time interval and frequency, and provide feedback on the shock wave ash removal effect. The unit system adopts on-site automatic control and manual control.

13. Each unit of the system adopts centralized control, integrated design and beautiful layout.

14. The control system can automatically and safely complete the soot blowing operation according to the set program sequence based on the parameters given by the operator, or it can work separately to blow soot on a single accumulated layer.

15. The gas source equipment is arranged on a ground that is easy to operate, and the mixed ignition unit and soot blowing distribution unit are centrally arranged in the nearest part of the boiler. The main control cabinet of the soot blowing control unit is arranged locally in the boiler room.

5、 Equipment performance guarantee

1. Design service life: 10 years for carbon steel body and 20 years for stainless steel body.

2. Annual continuous usage hours R8500 hours; The service life of vulnerable parts is greater than 3 years

3. Safety: No unburned gas enters the boiler flue, no pressure release hazards. During the operation of the equipment, there will be no resonance phenomenon in the convective heating surface tube group of the boiler flue, no damage to the furnace wall, no erosion, corrosion, or damage to the heating surface and lining, and no impact on the normal operation of the boiler. The device does not pose any harm to the human body during operation.

4. Performance: Effective impact strength R600KJ; The effective sound pressure level is 160dB.

5. Soot blowing effect: Operate according to the regulations to ensure that there is no ash accumulation or blockage on the heating surface of the boiler. Ensure that there is no significant accumulation of dust within the working range of the soot blower after it is put into operation. Improve the existing operating parameters of the boiler. After one month of operation, the exhaust temperature of the soot blowing system drops to the design target (only the increase in exhaust temperature caused by ash accumulation). The intensity of the pulse shock wave can be adjusted arbitrarily according to the type of ash accumulation, ensuring the smooth flow of the boiler flue gas channel.

6. Integrity: The integrity rate of the main equipment is 99%, and the leakage rate of the system's static sealing point is Q0.055.The leakage rate of the dynamic sealing point in the system is 0.1%, and the qualified rate of no air leakage in the system is 99%. The failure rate of the soot blower shall not exceed 3 times per year, and the noise outside the furnace during equipment operation shall be 80dB, which is lower than the national control standard range.

The equipment can prevent significant impacts on the gas system and issues such as acetylene gas pipeline flashback, ensuring safety; Ensure the stable long-term operation of the soot blower under the rated load and allowable overload conditions of the boiler.

6、 Use case of gas shock wave soot blower:

7、 Characteristics of XX-1 gas shock wave soot blower:

1. Small gas consumption: XX-1 gas soot blower adopts a large number of high-tech, which not only has reliable and stable soot blowing effect, extremely high safety and reliability, but also has good energy saving. Blow an average of 260-500 shots per bottle of acetylene. The intake pressure is 0.01-0.06 Mpa, while other manufacturers' soot blowers have an intake pressure of 0.1-0.15 Mpa, with an average of 100-120 cannons blown per bottle of acetylene. The above simple understanding is that the amount of acetylene used for the No. 3 cutting torch is the same as that used for the FX-01 gas pulse shock wave soot blower.

2. Imported solenoid valve is used: Italian Electrolux DN15 gas explosion-proof solenoid valve is used. When the intake pressure exceeds 0.06 Mpa, the solenoid valve does not open and does not enter, which better prevents potential hazards caused by excessive combustible gas in the generator.