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 relates to the technical field of boiler slag treatment, in particular to a biomass boiler slag treatment system and a method thereof. Background technique
• Bio-energy is currently the world's most widely used renewable energy source. Its total consumption is second only to coal, oil and natural gas. It is also the only renewable and renewable carbon source. With the increase in the number of biomass power plants, more and more ash waste is generated from boilers, which seriously affects the environmental quality.
• the global biomass power plant boiler has been using traditional slagging technology such as scraper type slag slag machine and spiral slag slag machine for many years.
• slagging technology such as scraper type slag slag machine and spiral slag slag machine for many years.
• the treatment technology has been continuously improved, there are still large water resources consumption, high operation and maintenance costs, and heat.
• the heat contained in the slag itself is completely lost in the cooling water and the slag has high carbon content, poor activity, and low comprehensive utilization.
• the main problems with the scraper type slag machine are: high water consumption, high power consumption, chain breakage, jamming may cause the boiler to stop running, affecting the stable operation of the boiler; loss of unburned carbon in the bottom slag causes energy loss, slag
• the heat contained in the boiler itself is completely lost in the water; the radiant heat loss in the bottom area of the boiler, and the steam generated by the high temperature slag falling into the water corrode the water wall of the boiler, the parts are corroded and the loss is serious, the maintenance cost is high, and the operator is exposed to potential
• the risk of injury the large coke falls into the water to produce a water hammer and steam explosion accident
• the comprehensive utilization value of the slag is low.
• Chinese patent CN101608795 discloses a biomass-modified water-cooled spiral slag discharge machine, which comprises a motor, the motor is connected to a drive shaft, the drive shaft is provided with a spiral blade, and the screw shaft is mounted on a U-shaped cylinder
• the cylinder is provided with a ash inlet and an outlet, and the transmission shaft and the blade are provided with a cooling water passage communicating with each other, and an inlet and an outlet of the cooling water passage are respectively disposed at an end of the transmission shaft,
• a cooling water passage is provided in the wall of the cylinder.
• the improved water-cooled spiral slag discharge machine has a large heat exchange area, a low slag temperature and a good cooling effect under the condition that the ash slag can be reused, but the ash slag is cooled by the cooling water, and then passes through the spiral slag discharge machine.
• the ash is removed, the unburned carbon in the slag is completely wasted, and the water consumption is serious.
• the heat dissolved in the water cannot be recycled, all discharged, and the environment is dirty. Dyeing.
• Chinese patent document CN200955757 discloses a boiler slag furnace waste heat recovery device.
• the main feature of the device is that a slag waste heat recovery tank is arranged on the slag conveyor chain row, the conveyor chain row is used as a waste heat recovery tank bottom, and the slag discharge pipe upper nozzle is welded in the original On the boiling furnace slag discharge pipe, the slag distributor at the lower end of the lower pipe extends into the recovery tank, and the slag is evenly discharged on the conveyor chain through the slag distributor, and the residual heat gas volatilized by the slag is collected in the waste heat recovery tank, in the blower Under the action, a negative pressure is generated in the slag waste heat recovery tank and the exhaust pipe, and the hot air is sucked into the fan through the exhaust pipe and sent to the boiler air chamber for coal combustion.
• the slag after cooling is discharged by the conveyor chain.
• the above patent document uses the conveyor chain as the bottom of the waste heat recovery tank, so that the slag on the conveyor chain heats the gas in the waste heat recovery tank, and then transfers the heat in the waste heat recovery tank to the boiler air chamber through the blower, which improves to some extent.
• the temperature of the combustion air increases the temperature control surface of the furnace, increasing the thermal efficiency of the boiler and the purpose of saving coal.
• the slag since the waste gas in the waste heat recovery tank is heated by the residual heat of the slag, the carbon in the partial slag is not fully burned, and only part of the residual heat of the slag is recovered; since the slag is in the sealed waste heat recovery tank, the slag is discharged through the conveyor chain After that, the slag still has a higher discharge temperature.
• the Chinese patent document CN202253689U discloses a chain boiler slag heat recovery device, which specifically includes: a slag pulverizing device, a cooling device and a heat recovery device, wherein the feed port of the slag pulverizing device is connected with the slag port discharged from the chain furnace, The discharge port of the slag crushing device is connected with the feed port of the cooling device, one end of the heat recovery device is connected with the water cooling system of the cooling device, and the other end is connected with the water inlet of the chain boiler, although For the problem of heat recovery, the slag is cooled to meet the discharge requirements. However, the discharged slag still contains a certain amount of unburned carbon.
• a biomass boiler slag treatment system comprising
• a slag tank the upper portion of which is connected to the furnace
• a slag conveying device wherein a feeding port is disposed below the outlet of the slag tank;
• the system also includes:
• a reburning device which is disposed between the slag tank and the slag conveying device;
• the slag tank is divided into a slag tank and a fine ash tank, and the re-combustion device is disposed below the outlet of the slag tank, and receives the slag outputted from the slag tank and re-combustes it.
• the reburning device includes a closed box, a combustion bed and an actuator;
• the tank is respectively connected to the slag tank outlet and the feed port of the slag conveying device;
• the combustion bed is disposed in the tank and located below the outlet of the slag tank;
• the actuator is fixedly coupled to one end of the combustion bed for driving the combustion bed to move horizontally to achieve opening and closing control of the slag tank outlet.
• the upper end surface of the combustion bed is a wedge-shaped bed surface, and the height of one end of the wedge-shaped bed near the actuator is greater than the height of the other end.
• the combustion bed has a hollow chamber, and the wedge bed surface is formed with a plurality of air outlets communicating with the hollow chamber; the combustion bed is further provided with a combustion gas introduction device, and the same
• the hollow chamber is connected to introduce a combustion-supporting gas into the combustion bed to achieve re-combustion of carbon in the slag on the combustion bed.
• the reburning device further includes a plurality of bed rails arranged in parallel, wherein the plurality of bed rails are fixed to a lower portion of the box; the combustion bed is disposed on the bed rail, and the lower end surface thereof The bed rail is slidably matched.
• the system also includes a slag crusher coupled to the discharge end of the slag conveying device, the spacing between adjacent two of the bed rails being less than the particle size of the feed slag of the slag crusher.
• a plurality of crushing teeth are disposed at one end of the combustion bed away from the actuator, and the crushing teeth are spaced apart from each other. Further, a plurality of the crushing teeth are disposed in parallel with the bed rail, and the casing is further provided with meshing and crushing teeth that mesh with the crushing teeth.
• An imaging device is further disposed on the box for detecting slag falling on the guide rail of the bed body;
• the imaging device and the actuator adopt linkage control.
• the actuator is activated to control the combustion bed to perform a crushing and crushing action on the slag.
• the wedge-shaped bed surface is provided with a plurality of sealed vent pipes arranged at intervals, a plurality of the vent pipes are arranged in parallel along a moving direction of the combustion bed, and a plurality of the vent holes are formed on the vent tube a venting port that communicates with the venting opening on a vertical plane that is offset from the venting tube.
• the combustion-assisting gas introduction device includes a gas introduction pipe and a combustion-supporting fan, and one end of the gas introduction pipe communicates with a hollow chamber of the combustion bed, and the other end thereof is connected to an air outlet of the combustion air blower.
• the actuator is a hydraulic cylinder or cylinder for driving the horizontal movement of the combustion bed.
• the slag conveying device is a closed structure, which comprises a sealed casing and a slag conveyor.
• the slag conveyor is fixed inside the casing, and the casing is formed with a discharge from the lower end of the casing.
• the mouth corresponds to the connected feed port, and the casing on the conveying end is provided with a normally open main cooling air regulating door.
• the slag conveying device is further provided with a ventilating device, which comprises a venting pipe and a regulating valve, wherein the venting pipe is in communication with the casing, and the regulating valve is fixed on the ventilating pipe;
• the control valve is opened when the reburning device is closed, and the cooling air is introduced into the casing by the main cooling air regulating door, and the cooling air heated by the slag is discharged by the ventilation pipe;
• the control valve is closed when the reburning device is turned on, and the cooling air is introduced into the casing by the main cooling air regulating door, and the cooling air heated by the slag is discharged to the furnace.
• an auxiliary cooling air regulating door is disposed at an end of the casing near the feeding port of the slag conveying device, and the auxiliary cooling air regulating door and the regulating valve realize a synchronous opening/closing action, and the ventilation pipe is set In the middle of the slag conveyor.
• a leveling device is disposed in the casing between the ventilation device and the slag tank for evenly distributing the slag on the slag conveyor.
• the regulating valve is a pneumatic or electric valve.
• the present invention provides a biomass boiler slag processing method, the method comprising:
• Step one closing the reburning device, causing the slag to vibrate through the grate to the reburning device, the grate vibration stops, and the carbon in the slag is reburned on the reburning device and the heat is returned to the furnace;
• Step 2 Turn on the re-burning device, and the slag falls onto the slag conveying device to discharge;
• Steps 1 and 2 are repeated in sequence to achieve carbon reburning and heat recovery in the slag.
• the method further comprises: opening the reburning device, dropping the slag onto the closed slag conveying device, opening the main cooling air regulating door at the conveying end of the slag conveying device, and discharging the cooling air and the slag to the furnace.
• the step 1 further comprises: closing the re-burning device, causing the slag to vibrate through the grate to the re-combustion device, charging the re-combustion device with the combustion-supporting gas, stopping the vibration of the grate, and the carbon in the slag is Forced on the combustion device The heat is returned to the furnace after combustion.
• the step 1 further comprises: closing the reburning device, opening a regulating valve located in the middle of the slag conveying device and an auxiliary cooling air regulating door at the conveying front end of the slag conveying device, and the cooling air is discharged from the ventilating pipe after being exchanged with the slag
• the step 2 further includes: opening the reburning device, closing the regulating valve located in the middle of the slag conveying device and the auxiliary cooling air regulating door at the conveying front end of the slag conveying device, and the cooling air is discharged to the furnace after heat exchange with the slag.
• the reburning device is turned on, and the slag falling on the guide rail of the bed is detected.
• the reburning device is controlled to perform the crushing action, so that the combustion bed is The intercepting slag is crushed and crushed, and the crushed slag is dropped onto the slag conveying device for discharge.
• the present invention provides a reburning device between the slag tank and the slag conveying device, and the slag is shaken to the slag conveying device through the grate vibration, and the grate stops vibrating, and the slag groove communicating with the furnace is at a slight negative pressure.
• the slag can be further burned on the reburning device, and the time of full combustion is ensured, so that the carbon in the slag is completely burned, and the heat released by the combustion of the carbon in the slag directly enters the furnace to make the slag The energy is recovered and the efficiency of the biomass boiler is increased.
• the structure of the reburning device can be selected according to the carbon content of the biomass slag, and the slag having a low carbon content is self-ignited on the reburning device, and the temperature is high due to the proximity to the furnace, relying on the furnace
• the effect of micro-negative pressure on the carbon in the slag is self-igniting on the re-combustion device, and the heat is returned to the furnace; for the slag with high carbon content, the slag falling on the re-combustion device is input by inputting the combustion-supporting gas to the re-combustion device.
• the carbon in the medium is forcedly burned to improve the carbon combustion efficiency in the slag, and the burnt slag falls on the slag conveying device, so that the slag can be rapidly cooled.
• the present invention provides a main cooling air regulating door at the conveying end of the closed slag conveying device.
• the reburning device When the reburning device is opened, the slag falls onto the slag conveyor and is transported backward along with the slag conveyor, and the air is regulated by the main cooling air.
• the door enters and moves in the opposite direction to the conveying direction of the slag conveyor, so that the temperature of the air entering the slag conveying device housing is gradually increased until it enters the furnace along the slag tank, and the slag on the slag conveyor has burned out
• the natural blast can be used to cool the slag.
• the heated air directly enters the furnace, so that the waste heat generated by the slag on the slag conveyor can be further recovered.
• the slag conveying device is further provided with a ventilation device.
• the regulating valve of the control ventilation device is opened, and the air inlets at both ends of the slag conveying device are opened, and the cooling air enters the casing from both ends of the slag conveying device.
• the heat is exchanged with the slag on the slag conveyor, and the heated cooling air is discharged into the atmosphere from the ventilating pipe to achieve cooling of the slag.
• an imaging device is provided on the casing of the reburning device, and the burned slag is detected, and if there is a large slag that is intercepted, the reburning device is controlled.
• the crushing is crushed so that the particle size of the crushed slag is smaller than the particle size of the feed slag of the crusher.
• the use of large slag crushing treatment increases the heat dissipation area of the large slag, so that more slag residual heat can be recovered, and the slag cooling time is also shortened.
• a leveling device is also arranged in the casing of the slag conveying device, and the slag accumulated on the slag conveyor after being burned is turned and flattened to increase the slag and The contact area of the air enhances the heat exchange effect between the slag and the air, which is beneficial to the cooling of the slag as soon as possible.
• FIG. 1 is a schematic structural view of a biomass boiler slag processing apparatus provided by the present invention
• FIG. 2 is a schematic structural view of another biomass boiler slag processing apparatus provided by the present invention.
• Figure 3 is a schematic view showing the connection structure of the combustion bed and the casing in Figure 2;
• Figure 4 is a schematic structural view of the reburning device of Figure 2;
• Figure 5 is a schematic cross-sectional view of Figure 4.
• Figure 6 is a structural view of a vent pipe of Figure 4.
• FIG. 7 is a structural view of another vent tube of Figure 4.
• FIG 8 is a structural view of another vent pipe of Figure 4.
• FIG. 9 is a structural view of another vent pipe of Figure 4.
• Figure 10 is a schematic view showing the overall structure of a biomass boiler slag processing apparatus provided by the present invention.
• Figure 11 is a schematic view of the air flow direction at the start of the vibration of the grate
• Fig. 12 is a schematic view showing the flow of air when the vibration of the grate is stopped.
• 2-slag conveying device 21-shell, 211-main cooling air regulating door, 212-auxiliary cooling air regulating door, 22-slag conveyor,
• the present invention provides a biomass boiler slag treatment system, comprising: a slag tank 1, a slag conveying device 2 and a reburning device 5, the slag tank 1 is connected to the furnace, and the inlet of the slag conveying device 2 Provided below the outlet of the slag tank 1, a reburning device 5 is tightly disposed between the slag tank 1 and the slag conveying device 2; the reburning device 5 is controlled to be closed, and the carbon in the slag is dropped through the slag tank 1 The reburning device 5 reactivates the carbon in the slag, and the heat generated by the combustion of the carbon in the slag is returned to the furnace; the reburning device 5 is controlled to be opened, and the slag is dropped onto the slag conveying device 2 for discharge.
• the reburning device 5 herein includes a closed casing 51, a combustion bed 52 and an actuator 57.
• the casing 51 is connected to the outlet of the slag tank 11 and the inlet of the slag conveying device 2, respectively, and the combustion bed 52 is disposed in the casing 51.
• the actuator 57 is fixedly connected to one end of the combustion bed 52 for driving the combustion bed 52 to move horizontally to realize opening and closing control of the outlet of the slag tank 11.
• the combustion bed 52 here can be inserted into the board, and the insert plate is horizontally moved by the actuator 57.
• the slag falls onto the board and Self-ignition occurs, and after self-ignition for a certain period of time, it is discharged to the slag conveying device 2 by opening the inserting plate.
• the combustion bed 52 is forcedly burned, and the combustion gas (air) is blown into the combustion bed to reburn the carbon in the slag, and the heat is returned to the furnace.
• the slag tank 1 is divided into a slag tank 11 and a fine ash tank 12 through the sealing baffle 4, wherein the fine ash trough 12 is directly connected to the feed port of the slag conveying device 2 through the connecting pipe 20, in FIG.
• a fine ash insert 30 is disposed in the connecting pipe.
• the fine ash insert 30 can be opened to control the fine ash falling on the fine ash insert 30 to the slag.
• the conveying device 2 discharges; and the slag passing through the slag tank 11 falls onto the reburning device, receives the slag outputted from the slag tank 11, and re-combustes it.
• the upper end surface of the combustion bed 52 is preferably a wedge-shaped bed surface 521, and the height of one end of the wedge-shaped bed surface 521 near the actuator 57 is greater than the height of the other end thereof, and the combustion bed can be pulled outward to realize the quick unloading of the slag. material.
• the combustion bed 52 when the carbon in the slag is reburned by forced combustion, the combustion bed 52 has a hollow chamber 522 in its structure, as shown in FIGS. 3, 4 and 5, in the combustion bed 52. A plurality of air outlets 523 are formed on the wedge-shaped bed surface 521 to communicate with the hollow chamber 522.
• the combustion bed 52 is further provided with a combustion-supporting gas introduction device 52 and a hollow chamber 522. The communication is used to introduce a combustion-supporting gas into the combustion bed 52 to achieve re-combustion of carbon in the slag on the combustion bed 52.
• the reburning device 5 further includes a plurality of bed rails 53 arranged in parallel, and the plurality of bed rails 53 are fixed to the lower portion of the casing 51; the combustion bed 52 is disposed on the bed rails. On the 53rd, the lower end surface thereof is slidably engaged with the bed rail 53.
• the system further includes a slag crusher 3 connected to the discharge end of the slag conveying device 2, and the spacing between the adjacent two bed guide rails 53 is smaller than the feed slag block of the slag crusher 3. granularity.
• the present invention also provides a plurality of crushing teeth 55 at one end of the combustion bed 52 away from the actuator, and the crushing teeth 55 are spaced apart from each other.
• a plurality of crushing teeth 55 are disposed in parallel with the bed rails 53, and the casing 51 is further provided with meshing crushing teeth 56 which are engaged with the crushing teeth 55, as shown in Figs.
• an imaging device 8 is further disposed on the casing 51 for detecting the slag falling on the bed rail 53; the camera 8 and the actuator 57 are controlled by linkage, when the camera When the device 8 detects that the slag is intercepted on the bed rail 53, the start actuator 57 controls the combustion bed 52 to perform the crushing and crushing action on the intercepting slag.
• the present invention preferably has a plurality of spaced-apart venting vents 54 disposed on the wedge-shaped bed surface 521.
• the plurality of venting tubes 54 are disposed in parallel along the moving direction of the combustion bed 52, and the venting tube 54 is formed thereon.
• a plurality of venting holes 541 communicating with the air outlet holes 523, the venting holes 541 are located on a vertical plane offset from the venting pipe 54.
• the structure of the venting tube can also adopt other structural forms. As shown in FIG. 6, FIG. 7, FIG. 8 and FIG. 9, respectively, different structures of the venting tube 54 are provided, and the venting tube 54 is placed on the air outlet 523, which is ventilated.
• the tube 54 and the top surface of the combustion bed 5 enclose a plurality of air outlet cavities; a venting hole 541 is defined in a side surface of the venting tube 54.
• the position of the vent 541 ensures that the slag does not block the vent 541 and the vent 523.
• the venting tube 54 shown in FIG. 6 is semi-spherical, which is respectively disposed outside each of the air outlets 523, and the venting holes 541 are formed on both sides of the venting tube 54.
• the venting tube 54 shown in FIG. 7 is semi-spherical. Each of the air outlets 523 is respectively disposed on the outer side of the air outlet 523.
• the air venting holes 541 are formed on one side of the air venting tube 54.
• the venting tube 54 shown in FIG. 8 is a mushroom head type venting tube, and the venting hole 541 is disposed on the lower side of the mushroom head;
• the vent tube 54 shown in Fig. 9 is a mushroom head type, and vent holes
• the combustion-assisting gas introduction device 7 includes a gas introduction pipe 71 and a combustion air blower 72.
• One end of the gas introduction pipe 71 communicates with the hollow chamber 522 of the combustion bed 52, and the other end thereof is connected to the air outlet of the combustion air blower 72.
• the actuator 57 is a hydraulic cylinder or cylinder for driving the horizontal movement of the combustion bed 52.
• the slag conveying device 2 in the above embodiment may be of an open structure, preferably a hermetic structure comprising a hermetic casing 21 and a slag conveyor 22, the slag conveyor 22 being fixed to the inside of the casing 21, and forming on the casing 21 a feed port corresponding to the discharge port at the lower end of the casing 51, and a normally open main cooling air regulating door 211 is provided on the casing 21 of the conveying end, when reburning When the device is turned on, the outside air can enter through the main cooling air regulating door 211, and the flow direction of the air is opposite to the conveying direction of the slag, forming a reverse cooling, and the cooling air is heated and enters the furnace.
• the slag conveyor 22 is composed of a high temperature resistant traction component, a supporting roller, a roller, a driving component and the like.
• the slag conveying machine is continuously operated, the output is adjustable, and can adapt to the requirement of slag discharging during abnormal combustion of the boiler, and is provided. Overload protection, parking protection device, accident signal is sent to the main control room.
• a ventilating device is further provided on the slag conveying device 2, which comprises a venting pipe 23 and a regulating valve 24, the venting pipe 23 is in communication with the casing 21, and the regulating valve 24 is fixed to the venting pipe 23.
• the combustion device 5 is opened, the regulating valve 24 is closed, the slag conveying device 2 is blocked from the outside, and the cooling air is exchanged with the slag on the slag conveying device and returned to the furnace.
• the air is exhausted by the air duct 23, and an auxiliary cooling air regulating door 212 is provided at an end of the casing 21 near the inlet of the slag conveying device 2, and the auxiliary cooling air regulating door 212 is provided.
• the venting pipe 23 is disposed in the middle of the slag conveyor 22, and when the reburning device is closed, the cooling air enters from both ends of the casing and passes through the slag conveying device 2
• the closed air duct is discharged by the air duct 23.
• a leveling device 25 is provided in the casing 21 between the ventilation device and the slag tank 1, for evenly distributing the slag on the slag conveyor 22, and leveling
• the device is of the prior art, and the scraper is a leveling device or a toggle wheel type flipping flat device, which effectively prevents the bottom slag of the boiler from being unevenly distributed on the traction member, and increases the contact area between the slag and the air. , enhance the heat exchange effect between slag and air.
• the regulating valve 24 is a pneumatic or electric valve that opens the valve pneumatically or electrically.
• the joint between the tank and the slag tank is provided with an expansion joint 6, which can absorb the thermal expansion of the equipment.
• the present invention also provides a biomass boiler slag treatment method:
• Step one closing the reburning device 5, causing the slag to vibrate through the grate 9 to the reburning device 5, the grate vibration stops, and the carbon in the slag is reburned on the reburning device 5 and the heat is returned to the furnace;
• Step 2 Turn on the reburning device 5, and the slag falls onto the slag conveying device 2 to discharge;
• Steps 1 and 2 are repeated in sequence to achieve carbon reburning and heat recovery in the slag.
• the slag conveying device here may be an open conveying structure or a closed conveying structure.
• Step one closing the reburning device 5, causing the slag to vibrate through the grate 9 to the reburning device 5, the grate vibration stops, and the carbon in the slag is reburned on the reburning device 5 and the heat is returned to the furnace;
• Step 2 the reburning device 5 is turned on, and the slag falls onto the closed slag conveying device 2, and the slag conveying device is opened at the same time.
• the main cooling air regulating door 211 of the conveying end is disposed, and the cooling air is heated by the slag and returned to the furnace, and the slag is conveyed and discharged by the slag conveying machine;
• Steps 1 and 2 are repeated in sequence to achieve carbon reburning and heat recovery in the slag.
• the first step further comprises: closing the reburning device 5, causing the slag to vibrate through the grate 9 to the reburning device 5, charging the reburning device 5 with the combustion-supporting gas, and vibrating the grate 9 After the carbon in the slag is forced to re-burn on the reburning device 5, the heat is returned to the furnace.
• the first step further comprises: closing the reburning device 5, opening the regulating valve 24 located in the middle of the slag conveying device 2 and the auxiliary cooling air regulating door 212 at the conveying front end of the slag conveying device 2, cooling wind and After the slag heat exchange, it is discharged by the ventilation pipe 23;
• the second step further comprises: opening the reburning device 5, closing the regulating valve 24 located in the middle of the slag conveying device 5 and the auxiliary cooling air regulating door 212 at the conveying front end of the slag conveying device 2, and the cooling air is exchanged with the slag and discharged to the furnace.
• step 2 the reburning device 5 is turned on, and the burned slag falling on the bed rail 53 is detected, and when the bed rail 53 is detected to have the intercepting slag, the reburning device is controlled. 5 is closed, and the combustion bed 52 is crushed and crushed on the intercepting slag, and the crushed slag is dropped onto the slag conveying device 2 for discharge.
• the slag is dropped into the slag tank through the vibration of the grate, wherein the fine ash falls to the fine ash tank, and the slag falls to the slag tank.
• the channel between the fine ash tank and the slag conveying device can be started regularly, and the fine ash is discharged to the slag conveying device for conveying and discharging;
• the reburning device is controlled to be closed by the actuator, and the slag is vibrated by the grate to the combustion bed of the reburning device.
• the combustion-supporting gas is input into the combustion bed through the combustion air blower and the gas introduction pipe, and the combustion-supporting gas contacts the slag through the hollow chamber, the air outlet hole and the vent hole, so that the unburned carbon in the slag is again burned, and the heat is directly returned to the furnace.
• the auxiliary cooling air regulating door at the front end of the regulating valve and the slag conveying machine is opened, and the flow direction of the cooling air is as shown in FIG. 11, the slag is conveyed on the slag conveying machine, and the slag on the slag conveying machine is spread by the leveling device.
• the cooling air enters from both ends of the slag conveyor, exchanges heat with the slag, and then discharges to the atmosphere through the vent pipe Slag delivered to the slag machine sequentially, residue positions, residue positions periodically discharged slag.
• the re-combustion device is controlled to open, and the regulating valve and the auxiliary cooling air regulating door at the front end of the casing are closed, and the cooling air is entered by the main cooling air regulating door that is normally opened at the end of the slag conveyor, and is carried out with the slag.
• Heat exchange the flow direction of the cooling air is as shown in Fig. 12, the heat is directly discharged to the furnace; at the same time, whether the intercepting slag is detected on the bed rail by the camera device, if the intercepting slag is found, the crushing action is performed by driving the combustion bed, Squeeze the slag to break it, thereby making it Fall to the slag conveyor.
• the combustion bed 4 can be designed in one or several groups, and the combustion bed 52 is designed to move open according to the vibration frequency of the boiler grate 9.
• the grate 9 vibrates every 600 seconds, and each time the vibration lasts for 10 seconds, the combustion bed 52 is moved to the bottom of the slag tank 10 about 30 seconds before the vibration of the grate 9 is set.
• the carbon in the slag is subsequently burned on each combustion bed for about 10 minutes, causing most of the unburned fuel and carbon to burn out.
• the actuator drives the combustion bed 5 to be removed, and the slag in the slag tank 11 is discharged to the slag conveying device 2.
• the combustion bed 2 is opened for slag and then closed for about 30 seconds. If there are several groups of combustion beds 52, the combustion beds 52 are sequentially opened and closed, and each group, the combustion bed 52 is opened and closed twice per hour, the combustion bed The opening time of 52 is shifted from the vibration time of the grate 9, and the fly ash generated by the positive pressure of the grate is prevented from escaping from the joint of the casing 21 of the lower slag conveyor 22.

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• 2012
  • 2012-08-17 CN CN201210293861.4A patent/CN102829466B/zh not_active Expired - Fee Related
  • 2012-08-17 CN CN201210295829.XA patent/CN102818254B/zh not_active Expired - Fee Related
• 2013
  • 2013-07-18 WO PCT/CN2013/079594 patent/WO2014015761A1/zh not_active Ceased
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