Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23H—GRATES; CLEANING OR RAKING GRATES
  • F23H1/00—Grates with solid bars
  • F23H1/02—Grates with solid bars having provision for air supply or air preheating, e.g. air-supply or blast fittings which form a part of the grate structure or serve as supports
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
  • F23J1/00—Removing ash, clinker, or slag from combustion chambers
  • F23J1/02—Apparatus for removing ash, clinker, or slag from ash-pits, e.g. by employing trucks or conveyors, by employing suction devices

Definitions

• the invention belongs to the technical field of biomass boilers, and particularly relates to a slag burning device for a biomass boiler.
• Biomass energy is currently the most widely used renewable energy in the world. Its total consumption is second only to coal, oil and natural gas. It is also the only renewable and renewable carbon source. Biomass power generation is a mature technology for the development and utilization of modern biomass energy. It is a technology that generates electricity by directly burning or converting biomass energy into combustible gas and then generating heat. China's biomass energy resources are quite rich, and biomass energy belongs to low-carbon energy. It plays an important role in gradually changing China's fossil fuel-based energy structure.
• Chinese patent CN102042585A discloses a slag and soot reburning and discharging device for a biomass direct-fired power generation boiler, which sends unburned slag to a slag crusher and then delivers it by pumping.
• the large particle ash separated by the cyclone separator is sent to the feeder by the screw conveyor reverse rotation, mixed with the biomass fuel and sent to the furnace of the power generation boiler for combustion to realize the slag. Combustion, improving the combustion efficiency of biomass fuels.
• the system has added a plurality of transmission pumps, cyclones, conveyors and the like to the original boiler, and the entire device has a complicated structure, and the production cost and the running cost are greatly improved.
• the entire unit needs to be operated under a condition of micro-negative pressure, which places high demands on the sealing of the various devices and increases the difficulty of the process.
• Cida Patent No. CN2901056Y discloses a chain boiler slag reburning device, which is provided with a sub-combustion chamber device behind the boiler, the device is covered by an upper arc-shaped upper cover, a combustion chamber in the middle, a lower portion of the combustion chamber is a hood, a hood and The lower air duct is connected, the air duct is connected with the ventilation switch, the other end of the ventilation switch is connected with the boiler air chamber; the lower right part of the combustion chamber is the slag outlet, the slag outlet is controlled by the slag blocking plate; the rear of the combustion chamber has an observation window .
• the device can re-burn the coal in the slag, prolonging the residence time of the slag and making full use of heat.
• the combustion chamber using the fixed structure causes the biomass fuel to remain in the sub-combustion chamber hood. On one side, the hood is eventually blocked, causing damage to the reburning device. Therefore, a combustion apparatus of this type is not suitable for use in a biomass boiler.
• the technical problem to be solved by the present invention is that the existing slag reburning device combustion chamber retains the slag, which ultimately causes the combustion chamber to be damaged, and further provides a slag combustion of the biomass boiler capable of avoiding the retention of the slag in the combustion chamber. Device.
• the present invention discloses a slag burning device for a biomass boiler, which includes a slag tank disposed at a lower end of the grate for receiving slag after burning the grate; and a slag discharging machine Provided below the slag tank for outputting burnt slag; a horizontally movable slag combustion bed is disposed between the slag tank and the slag discharge machine, and the slag combustion bed is a cavity structure , its connected combustion a plurality of air outlet holes are disposed on a top surface of the slag combustion bed; a scraping member is disposed on a side of the slag tank close to the slag combustion bed; the slag combustion bed is at a slag slag position and slag discharge Moving between the positions, the top of the slag combustion bed is engaged with the bottom end of the slag, and the upper surface of the slag combustion bed is adapted to pick up the s
• the scraping member extends to the vertical side wall of the slag combustion bed.
• the scraping member is a scraping plate fixedly connected to the slag tank.
• a hood is disposed on a top surface of the slag combustion bed, the hood is disposed on the air outlet hole, and the hood and a top surface of the slag combustion bed enclose a plurality of air outlet cavities;
• the side wall of the hood is provided with a hood outlet hole.
• the air outlet holes are arranged in a row along the moving direction of the slag combustion bed, and a plurality of semicircular tubular hoods arranged in a row are disposed on the air outlet hole, and the wind hood outlet holes are disposed on the side wall of the hood .
• the slag combustion bed is driven to move horizontally by a hydraulic actuator.
• the cavity of the slag combustion bed communicates with the blower through an air introduction tube.
• the bottom end of the slag combustion bed is provided with a support rail, and the support rail is in the form of a louver, and the louver is disposed along a moving direction of the slag combustion bed.
• the slag combustion bed is provided at the front end of the moving direction with crushing teeth for crushing the slag remaining on the support rail, and the crushing teeth pass the slag on the support rail by impact with the side of the support box After breaking into small pieces, it falls from the gap of the barrier.
• a swash plate is disposed in the slag tank, the swash plate partitions the slag tank into a slag tank communicating with a boiler combustion chamber, and a fine ash tank communicating with a boiler superheater side, the slag tank inner wall Cast heat resistant concrete.
• the oscillating partition is a multi-stage partition, each of which is driven by a hydraulic actuator, and the hydraulic actuator is connected to the partition by a high temperature push rod.
• the slagging machine is a dry slagging machine or a wet slag discharging machine.
• the grate is a vibrating grate or a chain grate.
• the high-temperature slag after combustion of the biomass boiler can be continuously burned on the slag combustion bed of the present invention, and the generated heat is returned to the furnace to avoid insufficient combustion of the fuel and high unburned carbon content in the slag.
• the fuel consumption and operating cost of the power plant are reduced, the comprehensive utilization value of the biomass boiler slag is improved, the environmental pollution is reduced, and the boiler efficiency is improved.
• the air outlet cap of the slag combustion bed of the present invention is formed by a bottom plate having a wind hole and a semicircular tubular top cover having a hole in the side wall, and the axial direction of the top cover and the slag combustion bed move. The direction is the same. On the one hand, the slag does not fall into the cavity of the combustion bed. On the other hand, during the reciprocating movement of the slag combustion bed, the top surface of the slag combustion bed does not hang the large slag.
• a crushing tooth is arranged at the front end of the slag burning bed, and the crushing tooth can crush the large coke block before the discharge to the lower slag discharging machine, and the large coke block is broken into less than the gap of the louver in advance.
• Small size slag for subsequent cooling of slag, avoiding existing boilers The danger of water hammer explosion caused by the large block of coke directly falling into the water.
• Figure 2 is a perspective view of a slag combustion bed and a support box
• Figure 5 is a side elevational view of another semi-spherical spherical hood
• Figure 6 is a side elevational view of the mushroom head hood
• Figure 6 is a side elevational view of another mushroom head hood.
• 8-support box 9-camera, 10-support rail, 11-swing diaphragm, 12-slag tank, 13-fine ash tank, 41-broken teeth.
• a slag burning device of a biomass boiler comprising: a slag tank 1 disposed at a lower end of the grate 2 for receiving slag after burning of the grate;
• the oscillating partition 11 partitions the slag tank 1 into a slag tank 12 communicating with a boiler combustion chamber and a fine ash tank 13 communicating with a boiler superheater side, and the inner wall of the slag tank 1 is heat-resistant Concrete.
• the outer wall of the slag tank is not overheated and does not deform.
• the oscillating partition 11 is oscillated by a hydraulic cylinder to realize communication and isolation of the slag tank 12 and the fine ash tank 13.
• the hydraulic cylinder and the oscillating partition 11 are connected by a high-temperature push rod 7, and the push rod 7 and the guide steel tube are sealed by a packing to prevent fine dust from escaping in the slag groove.
• the oscillating partition 11 is opened to discharge the slag into the slag tank 12 side.
• the oscillating partition 11 can also be designed as a plurality of sections, each section being driven by a hydraulic cylinder to be regularly opened, the opening angle and the opening gap can be adjusted, and each opening time is set according to actual needs. set.
• a refractory concrete of a certain thickness is cast on the left side of the oscillating partition 11 to prevent the high temperature flame from directly burning to the partition.
• the grate 2 is a vibrating grate.
• the slag burning device further includes a slag discharge machine 3 disposed under the slag tank 1 for outputting the burned slag; the slag discharge machine 3 in the embodiment is a dry slag discharge machine .
• a horizontally movable slag combustion bed 4 is disposed between the slag tank 1 and the slag discharge machine 3, and the slag combustion bed 4 is driven to move horizontally by a hydraulic actuator. As shown in Fig. 2, the slag combustion bed 4 has a cavity structure, and a cavity of the slag combustion bed 4 communicates with a blower through an air introduction pipe 6.
• a scraping member is disposed on a side of the slag tank 1 close to the slag burning bed 4; in the embodiment, the slag scraping member extends the slag tank 1 to the slag burning bed 4 Vertical side walls.
• the scraping component will be The slag on the slag combustion bed 4 is discharged to the slag discharge machine 3 to prevent slag from remaining.
• the upper surface of the slag combustion bed 4 is provided with a plurality of air outlet holes 51.
• the air outlet holes 51 are arranged in a row along the moving direction of the slag combustion bed 4.
• a hood 52 is disposed on a top surface of the slag combustion bed 4, and the hood 52 is disposed on the air outlet hole 51, and the hood 52 is surrounded by a top surface of the slag combustion bed 4.
• An air outlet cavity; a side wall of the hood 52 is provided with a hood air outlet hole 53.
• FIG. 4, FIG. 5, FIG. 6, and FIG. 7 are different structural forms of the hood 52, respectively, and the hood 52 is disposed on the air outlet hole 51, and the wind cap 52 is provided.
• a plurality of air outlet cavities are defined on a top surface of the slag combustion bed 4; a hood air outlet hole 53 is defined in a side surface of the hood 52. The position of the air outlet hole 53 ensures that the slag does not block the hood air outlet hole 53 and the air outlet hole 51.
• the hood 52 shown in FIG. 4 is semi-spherical, and is respectively disposed outside each of the air outlet holes 51.
• the hood air outlet holes 53 are formed on two sides of the hood 52;
• the hood 52 is a semi-spherical shape, which is respectively disposed outside each of the air outlet holes 51.
• the hood air outlet hole 53 is opened at one side of the 52.
• the hood 52 shown in FIG. 6 is a mushroom head hood.
• the hood air outlet 53 is disposed on the lower side of the mushroom head;
• the hood 52 shown in FIG. 7 is a mushroom head hood, and the hood air outlet 53 is disposed on both sides of the mushroom head.
• the slag combustion bed 4 moves between a slag burning position and a slag discharging position, and the slag burning bed 4 moves to the bottom end of the slag tank 1 when the slag burning bed 4 moves to the bottom end of the slag tank 1
• the top of the slag combustion bed 4 is joined to the bottom end of the slag tank 1, the upper surface of the slag combustion bed 4 is connected to the slag, and the slag continues to burn under the action of the combustion gas;
• Slag combustion bed 4 at the slag discharge position the slag combustion bed 4 is moved to be separated from the slag tank 1, the slag tank 1 is in communication with the slag discharge machine 3, and the burnt slag falls into the slag discharge machine 3 on.
• the bottom end of the slag combustion bed 4 is provided with a support rail 10, and the support rail 10 is in the form of a grid, and the grid is disposed along the moving direction of the slag burning bed 4.
• the support rails 10 are disposed on a support box 8, and a surveillance camera 9 is disposed on the side of the support box 8.
• the slag combustion bed 4 is provided with a crushing tooth 41 for crushing the slag remaining on the support rail 5 at the front end in the moving direction, and is monitored by the monitoring camera 9 to have a large slag block by the grid-type support rail After the interception, the slag combustion bed 4 is controlled to move horizontally, and the crushing teeth 41 crush the slag on the support rail 5 into small pieces by impact with the side of the support box, and then fall from the barrier interval.
• the slag combustion bed 4, the crushing teeth 41, and the grid-type support rails 10 are all made of high temperature resistant, impact resistant and wear resistant materials, with small thermal deformation and reliable operation.
• the slag combustion bed 4 can be designed in one or several groups, and the slag combustion bed 4 movement opening time is designed according to the vibration frequency of the boiler grate 2. For example, the grate 2 vibrates once every 600 seconds, and each time the vibration duration is 10 seconds, the slag combustion bed 4 is moved to the bottom of the slag tank 1 about 30 seconds before the vibration of the grate 2 is set.
• the slag is subsequently burned on each combustion bed for about 0.5 hours, causing most of the unburned fuel and carbon to burn out.
• the hydraulic cylinder drives the slag combustion bed 2 to be removed, and the slag in the slag tank 1 is discharged to the slagging device 3.
• the slag combustion bed 2 is opened for slag to be closed for about 30 seconds. If there are several groups of slag combustion beds 4, the slag combustion beds 4 are sequentially opened and closed, and each group of slag combustion beds 4 is opened and closed twice per hour.
• the opening time of the slag combustion bed 4 is staggered from the vibration time of the grate 2, and the fly ash generated by the positive pressure of the grate is prevented from escaping from the joint of the lower slag discharge machine 3.
• the scraping member is a scraping plate fixedly connected to the slag tank 1, and the slag burning bed 4 can also be horizontally moved by pneumatic or electric actuator driving.
• the grate 2 is a chain grate
• the slag discharge machine 3 is a wet slag discharge machine.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Gasification And Melting Of Waste (AREA)

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Publications (1)

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Citations (5)

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• 2012
  • 2012-08-17 CN CN201210295829.XA patent/CN102818254B/zh not_active Expired - Fee Related
  • 2012-08-17 CN CN201210293861.4A patent/CN102829466B/zh not_active Expired - Fee Related
• 2013
  • 2013-07-18 WO PCT/CN2013/079595 patent/WO2014015762A1/zh not_active Ceased
  • 2013-07-18 WO PCT/CN2013/079594 patent/WO2014015761A1/zh not_active Ceased
  • 2013-07-18 IN IN1324DEN2015 patent/IN2015DN01324A/en unknown
  • 2013-07-18 IN IN1323DEN2015 patent/IN2015DN01323A/en unknown

Patent Citations (5)

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