CN211600692U

CN211600692U - Heat accumulation type combustion system

Info

Publication number: CN211600692U
Application number: CN202020144383.0U
Authority: CN
Inventors: 高凤强; 雷林; 孙文君
Original assignee: Beijing Jixiang Energy Saving Technology Co ltd
Current assignee: Beijing Jixiang Energy Saving Technology Co ltd
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2020-09-29
Anticipated expiration: 2030-01-22

Abstract

The utility model relates to a heat accumulation type combustion system, which comprises a burner, a hearth, a heat accumulation box, an air blower and a four-way valve, wherein the burner is used for spraying combustion gas into the hearth, the heat accumulation box is arranged outside the hearth and is communicated with the hearth, two ends of the four-way valve are respectively communicated with the air blower and the heat accumulation box, the burner is provided with an on-duty fuel inlet, a main fuel inlet, a primary air inlet and a secondary air inlet, the on-duty fuel is provided to the on-duty fuel inlet on the burner through a first pipeline, the main fuel is provided to the main fuel inlet on the burner through a second pipeline, the primary air blower provides air required by the combustion of the on-duty fuel for the burner, and the secondary air blower provides air required by the combustion of the main fuel for the burner; the tertiary air first blower and the tertiary air second blower are both connected to a four-way valve, and the four-way valve is also respectively communicated with the first heat storage tank and the second heat storage tank.

Description

Heat accumulation type combustion system

Technical Field

The application relates to a heat accumulation type combustion system, which is suitable for the field of combustion.

Background

The application of heat accumulating type high-temperature air combustion to the intermittent aluminum melting reverberatory furnace in China has a history of nearly 20 years, and a relatively remarkable energy-saving effect is obtained. The traditional heat accumulating type combustion aluminum melting method can be divided into two types of reversing combustion and non-reversing combustion according to the mode of feeding fuel into a furnace. However, in any case, after charging, at the initial stage of ignition and temperature rise of the furnace, because the temperature of the hearth is low, furnace materials are randomly piled up and occupy the combustion space, and the thin plate material is easy to shield a flame nozzle, an air blast inlet and a smoke exhaust outlet of a combustor, so that a good high-temperature air combustion organization cannot be formed in the furnace. For the reversing combustion, in order to minimize the damage of explosion accidents, the furnace cover is opened or the furnace door is opened to realize 'lighting lamp' type combustion transition, so that the waste of heat is avoided; for non-reversing combustion, except for combustion transition by uncovering a furnace cover or opening a furnace door, the atmospheric diffusion type flame has very low rigidity, small convection heat transfer coefficient, slow temperature rise of the furnace and low production efficiency, and the energy-saving effect is not obvious because the time for melting is prolonged.

201910569259.0 discloses a high temperature industrial furnace heat accumulation formula combustion system, including the industrial furnace, two equal fixedly connected with intake pipes in lateral wall middle part about the industrial furnace, two equal fixedly connected with heat accumulation casees in both ends that the intake pipe is opposite, the heat accumulation case is detachable setting, the inside of two heat accumulation casees all is equipped with the heat accumulator, the equal fixedly connected with gas pipe in pipe wall upper end of two intake pipes, two gas pipe symmetries set up, and all fixedly on the pipe wall of two gas pipes be equipped with the gas valve, the equal fixedly connected with scavenge pipe of lower extreme of two heat accumulation casees, be connected with the switching-over valve between two scavenge pipes jointly. The gas pipe of supply gas is single in this technique for the mixed combustion effect of air and gas is poor, and the burning is insufficient.

201910568222.6 discloses a melt aluminium stove fast switch-over heat accumulation formula combustion system, including the furnace body, one side fixedly connected with heat-insulating box of furnace body, the heat-insulating box intussuseption is filled with the adsorption liquid, and the end intercommunication of giving vent to anger of furnace body has the outlet duct, and the other end of outlet duct runs through the roof of heat-insulating box and extends to the adsorption liquid in, is located the heat-insulating box of adsorption liquid and installs dust removal mechanism, and the intercommunication has the blast pipe on the one side tank wall that is located the heat-insulating box of adsorption liquid top. The heat accumulating type combustion system in the technology is only used for improving the mixed contact effect of the adsorption liquid and the flue gas, so that the purification degree of flue gas dust is improved, but not used for improving the air inlet temperature of combustion air, and the effects of energy conservation and efficiency improvement cannot be achieved.

201120255737.X discloses a heat accumulating type combustion special fuel nozzle, which comprises a fuel spray pipe, wherein a cold air duct is arranged outside the fuel spray pipe, a gap is formed between the cold air duct and the fuel spray pipe to form a cold air duct, a cold air pipe is fixed on the cold air duct, the cold air pipe is communicated with the cold air duct, and one end of the cold air duct is sealed. The burner has the advantages of simple structure and function, insufficient mixing of air and fuel, low speed of sprayed flame, and unsuitability for high-speed and high-temperature combustion.

201611138901.2 discloses a nozzle for gas burner, including the nozzle body, the nozzle body is including the shower nozzle that is the cavity form and holding a section of thick bamboo, the shower nozzle with hold the detachable sealing connection of one end of a section of thick bamboo, it has the material pipe that draws of venthole to be equipped with all around in the section of thick bamboo, the side that holds a section of thick bamboo is equipped with air intake pipe, it is equipped with connecting terminal on the pipe shaft of material pipe to draw, draw the material pipe through connecting terminal and the other end sealing fixed connection who holds a section of thick bamboo, the material pipe that draws in holding a section of thick bamboo and the inner wall of holding a section of thick bamboo and shower nozzle. Although this application can make the mixing of air and fuel relatively more sufficient, the velocity of the flame ejected is not high, and is not suitable for high-velocity and high-temperature combustion.

Therefore, there is a need in the art for a combustion system that can achieve sufficient mixing and combustion of air and gas, and can improve fuel utilization efficiency and save energy.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can make air and gas intensive mixing burning to improve fuel utilization efficiency, the energy saving's combustion system of heat accumulation type through the heat accumulation.

The heat storage type combustion system comprises a combustor, a hearth, a heat storage box, an air blower and a four-way valve, wherein the combustor is used for spraying combustion gas into the hearth, the heat storage box is arranged outside the hearth and communicated with the hearth, two ends of the four-way valve are respectively communicated with the air blower and the heat storage box, the combustor is provided with an on-duty fuel inlet, a main fuel inlet, a primary air inlet and a secondary air inlet, on-duty fuel is provided to the on-duty fuel inlet on the combustor through a first pipeline, the main fuel is provided to the main fuel inlet on the combustor through a second pipeline, the primary air blower provides air required by the on-duty fuel combustion for the combustor, and the secondary air blower provides air required by the main fuel combustion for the combustor; the tertiary air first blower and the tertiary air second blower are both connected to a four-way valve, and the four-way valve is also respectively communicated with the first heat storage tank and the second heat storage tank.

When the four-way valve is positioned at a first valve position, tertiary air enters the air supply pipeline through a tertiary air first blower and is blown into the hearth through the first heat storage box, and the tertiary air second blower sucks heated combustion-supporting air in the hearth into the second heat storage box for heat storage; when the four-way valve is in the position of the second valve, the tertiary air first blower blows hot air which is subjected to heat storage and temperature rise in the second heat storage tank back to the hearth, and the heated combustion air passes through the first heat storage tank for heat storage.

The burner is a double-cone rotational flow premixing burner and comprises an on-duty burner, wherein the on-duty burner is provided with an on-duty fuel inlet and a primary air inlet, the burner is also provided with a main fuel inlet pipe and a secondary air inlet, a rotational flow blade is arranged in the burner, and air entering the burner through the secondary air inlet is mixed with the main fuel and is sprayed into a mixed combustion bin after being accelerated by the rotational flow blade in a high-speed rotation manner; the mixed combustion bin is in a biconical arrangement and comprises a diffusion cone and a convergence cone, and the diffusion cone is in a diffusion type from upstream to downstream; the converging cone is convergent from upstream to downstream.

The lower reaches of the swirl vanes are also sequentially provided with a first drainage plate and a second drainage plate, the second drainage plate is fixed on the body of the co-combustion bin, and the first drainage plate is embedded into the second drainage plate.

The combustor further comprises an isolation bin, an acceleration bin and a preparation bin, wherein the preparation bin is arranged at the upstream of the isolation bin; the acceleration bin is arranged at the downstream of the isolation bin, and the mixed combustion bin is arranged at the downstream of the acceleration bin; the on-duty burner comprises a body and signal processing equipment arranged at the end part of the body, wherein the body of the on-duty burner extends into the isolation bin, and a nozzle of the on-duty burner extends into the acceleration bin; the body comprises a hollow conduit; the secondary air inlet is arranged on the side part of the acceleration bin, and the rotational flow blades are arranged in the acceleration bin.

The main fuel inlet pipe is arranged on the side part of the preparation bin, a fuel distribution and collection box is arranged in the preparation bin, a fuel spray pipe is arranged at the end part of the fuel distribution and collection box, and the main fuel inlet pipe is communicated with the fuel distribution and collection box; the fuel spray pipe is provided with an air outlet at the position of the isolation bin; the isolation bin and the acceleration bin are connected through flanges, the acceleration bin and the mixed combustion bin are connected through flanges, and the preparation bin and the isolation bin are connected through flanges; the tail end of the signal processing equipment is provided with a signal access terminal; and a flame detection port is also arranged on the side part of the isolation bin.

The beneficial technical effect of this application lies in:

1. the combustion system can preheat the air sprayed into the hearth through the heat storage box, so that the combustion of the air in the hearth is more energy-saving and efficient;

2. through the arrangement of the four-way valve, the combustion system can switch the inlet and the outlet of air, so that the two heat storage tanks can switch between the two functions of storing heat and providing heat-stored hot air, and heated air can be continuously supplied to the hearth;

3. the combustion system disclosed by the application uses the double-cone rotational flow premixing burner, and the on-duty burner can be kept in a combustion state all the time, so that subsequently entering gas and air can directly enter the combustion state without repeated ignition and flameout; through the arrangement of the preparation bin, the isolation bin, the acceleration bin and the mixed combustion bin, the internal structure of the whole combustor is reasonable, the gas flow track is clear, and the mixed combustion is sufficient; through the special design of the cyclone fan and the flow guide plate, on one hand, air entering through the secondary air inlet can be separated from the mixed combustion bin, and on the other hand, the sectional area of the air sprayed into the mixed combustion bin can be reduced, so that the flame sprayed out by the combustor is higher under the condition of the same spraying amount; by arranging the convergent cone, the section of the flue gas flow channel is gradually contracted, and partial flue gas is forced to flow back to the diffusion cone, so that ignition is strengthened; meanwhile, the flue gas is gradually accelerated to form high-speed flame jet flow, and the speed of the flame jet flow sprayed from the combustor can reach 300 m/s; through setting up the diffusion awl for the induced overgrate air who thoughtlessly fires the storehouse of whirl blade produces centrifugal force, forms local negative pressure in the region of catching fire, and the high temperature flue gas backward flow in the storehouse is thoughtlessly fired in the suction does benefit to and stabilizes the initial flame frontal surface.

Drawings

FIG. 1 shows an external schematic view of a double-cone swirl premix burner according to the present application.

FIG. 2 shows an internal schematic view of a double-cone swirl premix combustor according to the present application.

FIG. 3 shows a partial schematic view of a double-cone swirl premix combustor according to the present application.

FIG. 4 shows a schematic diagram of a regenerative type combustion system of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

As shown in fig. 1-3, the double-cone swirl premixing burner according to the present application comprises an on-duty burner 10, an isolation bin 20, an acceleration bin 30 and a co-combustion bin 40, wherein the isolation bin 20 and the acceleration bin 30 are connected with the acceleration bin 30 and the co-combustion bin 40 through flanges. The duty burner 10 comprises a body and a signal processing device 1 arranged at the end part of the body, wherein a signal access terminal 6 is arranged at the tail end of the signal processing device 1. The body comprises a hollow pipeline, an on-duty fuel inlet 2 and a primary air inlet 3 are arranged on the hollow pipeline, the body of the on-duty burner 10 extends into the isolation bin 20, and a nozzle 7 of the on-duty burner extends into the acceleration bin 30. The fuel on duty enters the body through the fuel inlet 2 on duty and is mixed with the air entering through the primary air inlet 3 to be ignited and then can be combusted. The application discloses fuel on duty is the fuel that plays the effect of igniting, can keep the combustion state all the time in the operation process for the gas and the air of follow-up entering can directly get into the combustion state, and need not to ignite repeatedly and put out a fire.

A preparation bin 11 is further arranged at the upstream of the isolation bin 20, and the preparation bin 11 is connected with the isolation bin 20 through a flange. The main fuel inlet pipe 5 is arranged at the side part of the preparation bin, the fuel distribution box 8 is arranged in the preparation bin 11, the end part of the fuel distribution box 8 is provided with a fuel spray pipe 21, and the main fuel inlet pipe 5 is communicated with the fuel distribution box 8. The fuel spray pipe 21 is provided with an air outlet at the position of the separation bin 20, and is also provided with a nozzle at the tail end thereof. The fuel entering the preliminary bunker through the main fuel inlet pipe 5 is collected in the fuel header tank 8 and injected into the separation bunker 20 and the acceleration bunker 30 through the fuel injection pipe 21. The side part of the isolation bin is also provided with a flame detection port 4 for detecting and observing flame in the combustor.

The side part of the acceleration bin 30 is provided with a secondary air inlet 31, and the acceleration bin 30 is internally provided with swirl vanes 34. The air entering the acceleration bin 30 through the secondary air inlet 31 is mixed with the fuel sprayed from the end of the fuel spray pipe 21 and sprayed into the co-combustion bin 40 after being high-speed rotationally accelerated by the swirl vanes 34. The downstream of the swirl vane 34 is also provided with a first flow guide plate 33 and a second flow guide plate 32 in sequence, the second flow guide plate 32 is fixed on the body of the mixed combustion bin 40, and the first flow guide plate 33 is embedded in the second flow guide plate 32. So set up, can separate the air that gets into through overgrate air import 31 and thoughtlessly burn storehouse 40 on the one hand, on the other hand can reduce the sectional area who spouts into thoughtlessly burn storehouse 40 to under the same condition of injection quantity, make the speed of combustor blowout flame bigger. The terms "upstream" and "downstream" in the present application mean that the inlet of the fuel is upstream and the outlet of the fuel is downstream with respect to the flow direction of the fuel.

The mixed combustion bin 40 is in a biconical arrangement and comprises a diffusion cone 41 and a convergence cone 42, the diffusion cone 41 is in a diffusion type from upstream to downstream, and the half cone angle is less than 5 degrees; the converging cone 42 is convergent from upstream to downstream with a half cone angle less than 16. The purpose of the diffusion cone 41 is to form local negative pressure in an ignition area through centrifugal force generated by secondary air introduced into the mixed combustion bin 40 by the cyclone blades 34, and suck high-temperature flue gas in the mixed combustion bin 40 to flow back, so as to be beneficial to stabilizing the initial flame front; the purpose of the converging cone 42 is two: one is that the cross section of the flue gas channel is gradually contracted to press part of the flue gas to forcibly flow back to the diffusion cone 41 so as to strengthen ignition; the other is to accelerate the smoke gradually to form high-speed flame jet, and the speed of the flame jet sprayed from the burner can reach 300 m/s. Preferably, the ratio of the lengths of the diffusion cone and the convergence cone is 0.1 to 10.

Referring to FIG. 4, a schematic diagram of a staged regenerative combustion system with the double-cone swirl premix burner described above is shown. As shown in the drawings, the regenerative combustion system according to the present application includes the burner 50, the furnace 51, the regenerative tank, the blower, the four-way valve 53, and the fuel line as described above, the burner 50 injects high-speed combustion gas into the furnace 51, and the regenerative tank is disposed outside the furnace 51 and communicates with the furnace 51. The blower may be provided in plural for supplying air required for the combustion of the on-duty fuel, air required for the combustion of the main fuel, and heat-accumulating air, respectively. The fuel lines include an on-duty fuel line and a main fuel line that provide an on-duty fuel and a main fuel, respectively. The two ends of the four-way valve 53 are respectively communicated with the inlet and the outlet of the tertiary air and the heat storage box, and the exchange of the tertiary air inlet pipeline and the tertiary air outlet pipeline is realized by switching the four-way valve, so that the heat storage box can continuously store hot air and continuously introduce the hot air into the hearth 51 for combustion supporting and circulation.

The burner 50 is provided with an on-duty fuel inlet, a main fuel inlet, a primary air inlet and a secondary air inlet, the on-duty fuel is provided to the on-duty fuel inlet on the burner 50 through a first pipe 501, the main fuel is provided to the main fuel inlet on the burner 50 through a second pipe 502, the primary air blower 56 provides air required for the on-duty fuel combustion to the burner 50, and the secondary air blower 58 provides air required for the main fuel combustion to the burner 50. The tertiary air first blower 54 and the tertiary air second blower 57 are both connected to the four-way valve 53, and the four-way valve 53 is also communicated with the first heat storage tank 521 and the second heat storage tank 522 respectively. When the four-way valve 53 is in the solid valve position shown in the figure, tertiary air firstly enters the air supply pipeline through the tertiary air first blower 54 and is blown into the hearth 51 through the first heat storage tank 521, and at the moment, the tertiary air second blower 57 sucks excess combustion air which is heated to high temperature in the hearth 51 into the second heat storage tank 522 for heat storage; then, the four-way valve 53 is controlled to switch to the valve position shown by the dotted line, the tertiary air first blower 54 blows the fresh air together with the hot air in the second heat storage tank 522, which has been heated by heat storage, back into the furnace 51, and the surplus combustion air, which has been heated again, passes through the first heat storage tank 521 for heat storage, and circulates in this way, so that the temperature of the hot air entering the furnace 51 is ensured to be heated by passing through the heat storage tank. Thus, a large amount of heat energy can be saved, and waste and loss of heat are avoided. The heat storage tank can be an alumina ball type heat storage tank, and each gas supply pipeline is provided with a regulating valve 55, which is conventional in the field and is not described in detail. Preferably, the ratio of the volumes of the first heat storage tank and the second heat storage tank is 0.1 to 10.

In another aspect, the present application further relates to a method for heating and melting by using the segmented regenerative combustion system, which is described below by taking molten aluminum as an example. It should be noted that the term "segment" in the present application refers to a stage of the entire heating process, and will be described in detail below.

The sectional type heat accumulation combustion system is similar to the traditional fuel non-reversing heat accumulation combustion system in process flow, and is mainly characterized in that the sectional type heat accumulation combustion system replaces a common atmosphere diffusion type burner with the flexibly-operated double-cone rotational flow premixing burner, and a combustion fan is independently configured for the double-cone rotational flow premixing burner and defined as a secondary fan. Correspondingly, a fan for providing combustion-supporting air for the on-duty burner is defined as a primary fan; the fan for providing the heat storage air for the hearth is defined as a tertiary fan. As shown in fig. 2 and 4.

In the production process, the operation of sectional type heat storage combustion aluminum melting decomposes the traditional simple high-temperature air combustion organization mode into three modes of a double-cone high-speed combustor complete combustion organization, a double-cone high-speed combustor incomplete combustion organization coupling furnace internal high-temperature air combustion organization and a furnace internal complete high-temperature air combustion organization according to the heating and melting process of the charging aluminum material. The three modes respectively correspond to three stages of ignition furnace starting temperature rise, solid aluminum material rapid melting and liquid aluminum water temperature rise in the aluminum melting process.

Ignition start-up temperature rise stage

After the furnace charge of the furnace burden is finished, a starting button of an upper computer is pressed, and the combustion system starts self-checking. And (4) when the self-inspection is qualified, starting the induced draft fan, the tertiary air fan, the secondary air fan and the primary air fan in sequence, enabling the system to enter a purging program, and identifying the furnace burden shielding condition of each outlet and each inlet of the hearth through the pneumatic balance of the blowing pipeline and the induced draft pipeline. And after the purging and shielding identification delay operation is finished, the opening degrees of the tertiary air regulating valve, the secondary air regulating valve and the primary air regulating valve are reset and adjusted from the maximum value. And confirming the flow of the three kinds of air, sequentially conducting an ignition electrode of the on-duty burner and a fast opening valve of on-duty fuel, and igniting the on-duty burner. And (4) conducting an on-duty fire check configured on the on-duty burner to show that the combustion is normal, then conducting the main fuel quick-opening valve, instantly igniting the double-cone high-speed combustor, and showing that the combustion is normal through the main fire check, wherein high-temperature flame is sprayed out from the convergent cone nozzle at high speed and directly enters the hearth. And in the process of starting the furnace, if a fault alarm occurs, cutting off the main fuel quick-opening valve and the duty fuel quick-opening valve, and stopping the ignition and returning to the purging program. Wherein, two four-way switch valves are in freely switching operating condition, and tertiary air governing valve only opens a bit, and the purpose is to control exhaust gas temperature to reduce the heat loss of discharging fume. In the operation process of the stage, the combustion organization in the premixing burner is a thorough high-strength premixing combustion organization, and no high-temperature air combustion organization (namely heat storage air) is formed in the hearth.

Fast melting stage of solid aluminum material

As the temperature of the hearth rises, the freely piled furnace charge begins to melt and collapse, and the free space in the furnace is gradually released. When the temperature in the furnace reaches a set threshold value, the measurement and control system sends an instruction, the stage is decomposed into a plurality of sub-stages according to a set program, and each sub-stage is connected in series according to different parameters for delayed operation. In each sub-stage, the action sequence of the equipment is to increase the frequency of the induced draft fan, increase the opening of the tertiary air regulating valve, reduce the opening of the secondary air regulating valve and increase the opening of the main fuel regulating valve in sequence. And in the last sub-stage, sequentially opening the tertiary air regulating valve to the upper limit of the designed air volume, adjusting the secondary air regulating valve to the lower limit of the designed air volume, and opening the main fuel regulating valve to the upper limit of the designed fuel volume. In order to ensure safety, the secondary fan continues to operate at high Hertz, and the air in front of the secondary air regulating valve is used as shielding air of the main fuel gas. At the end of the stage, the premixing burner is changed from an incomplete premixing burner into a simple main fuel heater, namely, the heat provided by the on-duty burner of the main fuel is heated in the double-cone cavity and then is sprayed into the hearth at high speed, and then the high-speed high-temperature tertiary air entering the hearth through the heat storage box is guided and mixed to form a thorough high-temperature air combustion organization.

Aluminum water heating stage

The solid furnace burden is completely melted and collapsed, the liquid level of the molten aluminum is initially formed, and the molten aluminum enters the radiant heating stage, so that the proportion of convection heat transfer of the hearth to the total heat transfer is obviously reduced. At the moment, the total combustion heat load is reduced, the furnace temperature is maintained to carry out continuous radiation heating on the molten aluminum until the temperature of the molten aluminum reaches the temperature required by downstream casting processing, and the melting process is terminated.

According to the characteristics of the three stages, the method for heating and melting by using the sectional type heat storage combustion system can comprise the following steps:

(1) starting an induced draft fan, a tertiary air fan, a secondary air fan and a primary air fan in sequence, and enabling the system to enter a purging program;

(2) adjusting the opening degrees of the tertiary air adjusting valve, the secondary air adjusting valve and the primary air adjusting valve;

(3) sequentially conducting an ignition electrode of the on-duty burner and an on-duty fuel quick-opening valve, and igniting the on-duty burner;

(4) then conducting a main fuel quick-opening valve of the double-cone premix burner, and igniting the double-cone premix burner instantly;

(5) when the temperature in the furnace reaches the set temperature, decomposing the stage into a plurality of sub-stages according to a set program, and connecting the sub-stages in series according to different parameters for delayed operation; the main fuel is heated and sprayed into the hearth in the double-cone cavity by the heat provided by the on-duty burner, and then is guided and mixed by tertiary air entering the hearth through the heat storage box to form a thorough high-temperature air combustion organization;

(6) and after the solid furnace burden is completely melted and collapsed, forming a melt liquid level, entering a radiation heating stage, reducing combustion heat load, and maintaining the furnace temperature for continuous radiation heating until the temperature reaches the temperature required by downstream casting processing.

In each sub-stage of the step (5), the action sequence of the equipment is to increase the frequency of the induced draft fan, increase the opening of the tertiary air regulating valve, reduce the opening of the secondary air regulating valve and increase the opening of the main fuel regulating valve in sequence; and in the last sub-stage, sequentially opening the tertiary air regulating valve to the upper limit of the designed air volume, adjusting the secondary air regulating valve to the lower limit of the designed air volume, and opening the main fuel regulating valve to the upper limit of the designed fuel volume. The purpose of the setting of the action sequence is that along with the rise of the temperature in the hearth, more air needs to be introduced through the tertiary air regulating valve to be stored in the heat storage box as heat storage air after being heated, so that the temperature rise and storage of fresh air can be realized through the switching of the four-way valve, more main fuel does not need to be introduced, and the energy loss is greatly saved.

Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.

Claims

1. A heat storage type combustion system comprises a burner, a hearth, a heat storage box, a blower and a four-way valve, wherein the burner is used for spraying combustion gas into the hearth, the heat storage box is arranged outside the hearth and communicated with the hearth, two ends of the four-way valve are respectively communicated with the blower and the heat storage box,

the combustor is provided with an on-duty fuel inlet, a main fuel inlet, a primary air inlet and a secondary air inlet, the on-duty fuel is provided to the on-duty fuel inlet on the combustor through a first pipeline, the main fuel is provided to the main fuel inlet on the combustor through a second pipeline, the primary air blower provides air required by the on-duty fuel combustion for the combustor, and the secondary air blower provides air required by the main fuel combustion for the combustor; the tertiary air first blower and the tertiary air second blower are both connected to a four-way valve, and the four-way valve is also respectively communicated with the first heat storage tank and the second heat storage tank.

2. The combustion system of claim 1 wherein when the four-way valve is in the first valve position, tertiary air is passed through a tertiary air first blower into the air supply line and is blown into the furnace through a first regenerator, and a tertiary air second blower draws combustion air that has been heated in the furnace into a second regenerator for heat storage; when the four-way valve is in the position of the second valve, the tertiary air first blower blows hot air which is subjected to heat storage and temperature rise in the second heat storage tank back to the hearth, and the heated combustion air passes through the first heat storage tank for heat storage.

3. The combustion system of claim 1, wherein the burner is a double-cone swirl premix burner comprising an on-duty burner, the on-duty burner is provided with an on-duty fuel inlet and a primary air inlet, the burner is further provided with a main fuel inlet pipe and a secondary air inlet, swirl vanes are arranged in the burner, and air entering the burner through the secondary air inlet is mixed with the main fuel and is injected into the mixed combustion bin after being accelerated by the swirl vanes through high-speed rotation; the mixed combustion bin is in a biconical arrangement and comprises a diffusion cone and a convergence cone, and the diffusion cone is in a diffusion type from upstream to downstream; the converging cone is convergent from upstream to downstream.

4. The combustion system of claim 3, wherein a first flow guide plate and a second flow guide plate are sequentially arranged at the downstream of the swirl vanes, the second flow guide plate is fixed on the body of the co-combustion bin, and the first flow guide plate is embedded in the second flow guide plate.

5. The combustion system of claim 3 or 4, wherein the combustor further comprises an isolation bin, an acceleration bin, and a preparation bin, the preparation bin being disposed upstream of the isolation bin; the acceleration bin is arranged at the downstream of the isolation bin, and the mixed combustion bin is arranged at the downstream of the acceleration bin; the on-duty burner comprises a body and signal processing equipment arranged at the end part of the body, wherein the body of the on-duty burner extends into the isolation bin, and a nozzle of the on-duty burner extends into the acceleration bin; the body comprises a hollow conduit; the secondary air inlet is arranged on the side part of the acceleration bin, and the rotational flow blades are arranged in the acceleration bin.

6. The combustion system of claim 5, wherein the main fuel inlet pipe is arranged at the side part of the preparation bin, a fuel distribution box is arranged in the preparation bin, a fuel spray pipe is arranged at the end part of the fuel distribution box, and the main fuel inlet pipe is communicated with the fuel distribution box; the fuel spray pipe is provided with an air outlet at the position of the isolation bin.

7. The combustion system of claim 6, wherein the separation bin and the acceleration bin are connected through flanges, and the preparation bin and the separation bin are connected through flanges.

8. The combustion system of claim 5, wherein the signal processing device is terminated with a signal access terminal.

9. The combustion system of claim 5, wherein the side of the isolation bin is further provided with a flame detection port.