CN106247615B - Double-fuel boiler - Google Patents

Abstract

The invention discloses a dual-fuel boiler, which includes a base, a furnace body, a main combustion chamber, an auxiliary combustion chamber, a fire grate, and an ash storage tank. The main combustion chamber and the auxiliary combustion chamber arranged on the left and right are arranged inside the furnace body. The lower part of the main combustion chamber and the auxiliary combustion chamber are equipped with fire grates and ash storage tanks arranged up and down. The side walls of the main combustion chamber and the auxiliary combustion chamber above the fire grate are respectively provided with a main feeding port and an auxiliary feeding port. The upper part of the main combustion chamber above the mouth is fixed horizontally with a water exchange tank. Advantages: realize multi-fuel chamber combustion, complete combustion, can effectively improve the combustion efficiency of raw materials, avoid the waste of raw materials; greatly reduce the air intake at the bottom of the furnace, significantly reduce the disturbance effect of the intake air, and greatly reduce the dust content in the flue gas; Body water jacket, furnace cover water jacket, split water jacket and heat exchange tank are combined for heat exchange, with high heat exchange area ratio and high heat exchange efficiency, greatly reducing heat loss and improving energy utilization.

Description

dual fuel boiler

Technical field:

The invention relates to the technical field of heating furnaces, in particular to a dual-fuel boiler.

Background technique:

In the north of our country, the temperature is low in winter. Generally, the heating furnace is used to burn coal to heat the water in the radiator or the floor heating pipe, and the heating is realized by hot water circulation. At present, most heating furnaces on the market use fuel to burn directly in the furnace, and the smoke after combustion enters the smoke pipe to heat the water in the smoke pipe water tank. In order to fully burn the fuel inside the furnace body, it is necessary to increase the air intake at the bottom of the furnace. Combustion-supporting, however, the "direct-fired" boiler has the following disadvantages during use: 1. There is only one solid fuel chamber, and multiple fuels with different gasification or combustion conditions can be gasified or burned in the same solid fuel chamber, and cannot be simultaneously Satisfy the combustion conditions of different fuels, resulting in incomplete gasification or combustion of various fuels, resulting in waste of raw materials; 2. The "direct-fired" boiler only burns once, and does not carry out solid fuel and gas fuel according to different combustion conditions. 3. Due to the short combustion range, the combustible gas generated during the fuel combustion process cannot be fully combusted, and these combustible gases are discharged into the atmosphere along with the flue gas, which not only causes waste of resources, It will also pollute the environment; 4. The flame formed by fuel combustion is large in size, and the fuel is only assisted by the air intake at the bottom of the furnace. , and the air intake at the bottom of the furnace is too large, a large amount of ash formed by fuel combustion is discharged with the flame, and the smoke and dust content is particularly large, polluting the environment; The generated critical temperature and high-temperature combustion lead to the production of a large amount of nitrogen oxides, which endangers the health of surrounding personnel; 6. The heat transfer area ratio of the smoke pipe water tank is low, which cannot effectively transfer heat, and the heat is discharged with a large amount of flue gas, and the heat utilization rate is low. 7. The furnace cover is mostly a single-layer furnace cover. The flame in the furnace body directly contacts the furnace cover, and part of the heat will be lost through the furnace cover, resulting in a waste of energy.

Invention content:

The object of the present invention is to provide a dual-fuel boiler capable of fully burning fuel and improving energy utilization.

The present invention is implemented by the following technical solutions: a dual-fuel boiler, which includes a base, a furnace body, a main combustion chamber, an auxiliary combustion chamber, a fire grate, and an ash storage tank, the furnace body is arranged on the top of the base, and the furnace A furnace body water jacket is set outside the body, and the main combustion chamber and the auxiliary combustion chamber arranged on the left and right are arranged inside the furnace body, and the main combustion chamber and the auxiliary combustion chamber are connected through a connecting pipe. , a furnace cover is provided inside the furnace mouth at the top of the main combustion chamber, and the fire grate and the ash storage tank arranged up and down are arranged at the lower part of the main combustion chamber and the auxiliary combustion chamber. The main combustion chamber above the fire grate and the side wall of the auxiliary combustion chamber are respectively provided with a main charging port and a secondary charging port, and the side wall of the secondary combustion chamber between the secondary charging port and the fire grate There is a slag cleaning port on the top, and a smoke exhaust port is provided on the side wall of the main combustion chamber; the base is a hollow shell, and the cavity inside the base is an air distribution chamber, and on the side of the air distribution chamber An air distribution port communicating with the interior of the air distribution chamber is provided on the wall; a water exchange tank is fixed horizontally on the upper part of the main combustion chamber above the main feeding port, and the water exchange tank is connected with the water jacket of the furnace body. communicate with each other; below the smoke exhaust port, a partition is fixed horizontally inside the main combustion chamber on the top of the water exchange tank, and the main combustion chamber between the partition and the top of the water exchange tank It is a combustion-supporting chamber; a ring-shaped air distribution pipe is fixed horizontally on the inside of the main combustion chamber below the water exchange tank and on the top of the auxiliary combustion chamber, and several air distribution holes are arranged on the inner side of the air distribution pipe ; Between the combustion-supporting chamber and the air distribution chamber, between each of the air distribution pipes and the air distribution chamber, an air supply pipe is connected; vertically sealed and penetrated inside the heat exchange tank There is more than one guide pipe, the bottom end of the guide pipe seals through the bottom of the heat exchange tank, and is placed under the corresponding air distribution pipe; the top of the guide pipe seals through the heat exchange tank in turn The top of the water tank and the partition are placed above the partition; a number of air distribution holes are arranged on the wall of the draft tube inside the combustion chamber.

Further, the grate is a grate with adjustable grate spacing.

Further, a damper is provided on the side wall of the furnace body between the grate and the ash storage tank.

Further, a wind cap is provided on the top of the draft tube.

Further, a split water jacket is vertically provided inside the furnace body, and the split water jacket communicates with the furnace body water jacket; the inside of the furnace body on one side of the split water jacket is the main combustion chamber, the interior of the furnace body on the other side of the split water jacket is the auxiliary combustion chamber; a communication pipe is sealed and pierced in the middle of the split water jacket, and one end of the communication pipe is placed in the main combustion chamber. The inside of the main combustion chamber above the feeding port, and the other end of the communication pipe is placed inside the auxiliary combustion chamber above the auxiliary feeding port.

Further, a baffle plate opposite to the communication pipe is vertically provided inside the auxiliary combustion chamber, the top of the baffle plate is placed below the corresponding air distribution pipe, and the bottom of the baffle plate The end is fixedly connected with the outer wall of the divided water jacket below the communicating pipe through a horizontal connecting plate, and the outer walls of the divided water jacket on both sides of the communicating pipe in the auxiliary combustion chamber are respectively connected to the adjacent water jacket through a vertical connecting plate. The sides of the baffle are fixedly connected.

Further, on the said baffle plate and the outer wall of said split water jacket opposite to said baffle plate, several deflector plates arranged in a staggered manner are horizontally fixed respectively.

Further, the furnace cover is provided inside the furnace mouth at the top of the auxiliary combustion chamber.

Further, the furnace cover is a double-layer furnace cover, and the double-layer furnace cover includes a support tube, a lower furnace ring, a lower furnace cover, an upper furnace ring, and an upper furnace cover, and the lower nozzle of the support tube is placed in the corresponding Inside the furnace mouth, the lower furnace ring is movable on the top of the lower nozzle of the support tube, and the lower furnace cover is partially provided on the top of the center hole of the lower furnace ring; on the support tube The upper furnace hoop is movable on the top of the nozzle, and the upper furnace cover is partially arranged on the top of the center hole of the upper furnace hoop.

Further, a furnace cover water jacket is provided on the top of the furnace body on the periphery of the support tube, and the furnace cover water jacket is respectively connected with the smoke exhaust water jacket and the furnace body water jacket.

Advantages of the present invention: the dual-fuel boiler of the present invention realizes multi-fuel combustion in separate chambers, so that fuels with different gasification and combustion conditions can be combusted in separate chambers in two combustion chambers, and the combustion is sufficient, which can effectively improve the combustion efficiency of raw materials , to avoid waste of raw materials; through the grate, air supply pipe, and furnace cover to provide combustion-supporting air for the flame combustion in the furnace body, the air intake at the bottom of the furnace is greatly reduced, the air intake disturbance effect is significantly reduced, and the ash formed by the gasification and combustion of solid fuel It is not easy to be discharged with the flame, and the dust content in the flue gas is greatly reduced; especially in the main combustion chamber, it has realized multi-stage combustion, multi-stage back-burning, and multiple combustion-supporting, so that the fuel and combustible gas can be fully burned, and the dust and carbon monoxide content in the flue gas has been greatly reduced. reduce the emission to meet the emission standards; the draft tube divides the large-volume flame into several smaller flames, and the inner flame and the middle flame are fully saturated with the combustion air, fully combusted, and greatly reduce the carbon monoxide content in the flue gas; Absorb the heat of the outer flame of the flame, reduce the combustion temperature of the flame, and inhibit the formation of nitrogen oxides; the water jacket of the furnace body, the water jacket of the furnace cover, the split water jacket and the water exchange tank are combined for heat exchange, with high heat exchange area ratio and high heat exchange efficiency , greatly reducing heat loss and improving energy utilization.

Description of drawings:

Figure 1 is a schematic diagram of the overall structure of the present invention.

Figure 2 is a schematic diagram of the structure of the double-layer furnace cover.

Fig. 3 is a schematic diagram of the grate structure with adjustable grate spacing.

Fig. 4 is a schematic diagram of the use of the present invention.

Base 1, furnace body 2, main combustion chamber 3, auxiliary combustion chamber 4, fire grate 5, frame 51, furnace bar 52, tie rod 53, connecting rod 54, rotating shaft 55, ash storage tank 6, furnace mouth 7, furnace cover 8 , support pipe 81, lower furnace ring 82, lower furnace cover 83, upper furnace ring 84, upper furnace cover 85, main feeding port 9, auxiliary feeding port 10, smoke exhaust port 11, split water jacket 12, air distribution chamber 13, Air distribution port 14, heat exchange tank 15, partition 16, combustion chamber 17, air distribution pipe 18, air distribution hole 19, air supply pipe 20, diversion pipe 21, air distribution hole 22, furnace water jacket 23, smoke exhaust Pipe 25, smoke exhaust water jacket 26, temperature sensor 27, controller 28, circulating water pump 29, heat collecting pipe 30, damper 31, furnace cover water jacket 32, connecting pipe 33, slag cleaning port 34, baffle plate 35, horizontal connection Plate 36, vertical connecting plate 37, secondary combustion chamber 38, primary combustion chamber 39, heating pipe row 40, deflector 41.

detailed description:

As shown in Figure 1, the dual-fuel boiler includes a base 1, a furnace body 2, a main combustion chamber 3, an auxiliary combustion chamber 4, a fire grate 5, and an ash storage tank 6. The outside of the body 2 is provided with a furnace body water jacket 23, and the main combustion chamber 3 and the auxiliary combustion chamber 4 arranged on the left and right are arranged inside the furnace body 2. There is a furnace cover 8,

As shown in Figure 2, the furnace cover 8 is a double-layer furnace cover. The nozzle is placed inside the corresponding furnace mouth 7, a lower furnace ring 82 is movable on the top of the lower nozzle of the support tube 81, and a lower furnace cover 83 is arranged on the top of the center hole of the lower furnace ring 82; An upper furnace ring 84 is movable on the top of the mouth, and an upper furnace cover 85 is arranged on the top part of the center hole of the upper furnace ring 84; since the inside of the furnace body 2 is a negative pressure environment, the cold air outside the furnace body 2 passes through the upper furnace cover 85 The gap between it and the upper furnace ring 84 is sucked into the inside of the support tube 81, and absorbs the heat transferred to the inside of the support tube 81 through the lower furnace cover 83, so as to avoid heat loss and improve energy utilization; the cold air after absorbing heat passes through the lower The gap between the furnace cover 83 and the lower furnace ring 82 enters the inside of the furnace body 2 to provide sufficient oxygen for the flame combustion in the furnace body 2; The cover water jacket 32 communicates with the smoke exhaust water jacket 26 and the furnace body water jacket 23 respectively; the water in the furnace cover water jacket 32 can fully absorb and utilize the heat in the support pipe 81, prevent the heat loss in the support pipe 81, and improve the utilization of heat energy Rate;

Bottoms of the main combustion chamber 3 and the auxiliary combustion chamber 4 are provided with a fire grate 5 and an ash storage tank 6 arranged up and down. In order to adjust the ventilation rate of the fire grate 5, as shown in Fig. A damper 31 is provided on the side wall of the furnace body 2 between them, and the air intake at the bottom of the fire grate 5 is adjusted by adjusting the opening of the damper 31, that is, the larger the opening of the damper 31, the more air intake at the bottom of the fire grate 5 The smaller the opening of the damper 31, the less the air intake at the bottom of the grate 5; or the grate 5 is a grate with adjustable grate spacing as shown in Figure 3, and the detailed structure is disclosed in the patent number CN201520110418.8 A fire grate with adjustable grate spacing, which includes a frame 51, a fire bar 52, a tie rod 53, and a connecting rod 54; five fire bars 52 are evenly arranged in parallel inside the frame 51, and each fire bar 52 ends Respectively through a rotating shaft 55 and the adjacent frame 51 side walls are rotationally connected; the top of the rotating shaft 55 on one side of the frame 51 side wall passes through the frame 51 side wall and is placed outside the frame 51; each rotating shaft 55 outside the frame 51 The top is fixedly provided with a connecting rod 54 perpendicular to the axis of the rotating shaft 55, and the tops of the evenly parallel arranged connecting rods 54 are respectively articulated with the pull rods 53; 52 rotates around the rotating shaft 55, and then changes the distance between the fire bars 52. By adjusting the distance between the fire bars 52 of the fire grate 5, the air volume entering the body of furnace 2 from the fire grate 5 can be adjusted; The air causes the fuel on the grate 5 to oxidize and burn at a lower oxygen concentration to generate combustible gases such as carbon monoxide and flames, which greatly reduces the air intake at the bottom of the furnace, significantly reduces the disturbance effect of the intake air, and makes the ashes formed by gasification and combustion of the fuel less likely to follow the flames. The dust content in the flue gas is greatly reduced;

The main combustion chamber 3 above the fire grate 5 and the side walls of the auxiliary combustion chamber 4 are respectively provided with a main charging port 9 and a secondary charging port 10, and the main fuel is added from the main charging port 9 to the top of the fire grate 5 in the main combustion chamber 3 , the main fuel is coal, and the auxiliary fuel is added to the top of the fire grate 5 in the auxiliary combustion chamber 4 from the auxiliary feeding port 10. The side wall of the auxiliary combustion chamber 4 between the fire grates 5 is provided with a slag cleaning port 34, which is convenient for cleaning the ash on the fire grates 5;

A split water jacket 12 is vertically provided inside the body of heater 2, and the split water jacket 12 communicates with the heater body water jacket 23; The inside of the furnace body 2 on the side is the auxiliary combustion chamber 4; a connecting pipe 33 is sealed and penetrated in the middle of the split water jacket 12, and one end of the connecting pipe 33 is placed inside the main combustion chamber 3 above the main feeding port 9, and the other end of the connecting pipe 33 Placed inside the auxiliary combustion chamber 4 above the auxiliary feeding port 10;

Inside the auxiliary combustion chamber 4, a baffle plate 35 is vertically arranged opposite to the connecting pipe 33. The top of the baffle plate 35 is placed under the corresponding air distribution pipe 18, and the bottom end of the baffle plate 35 is connected to the connecting plate 36 by the horizontal connecting plate 36. The outer walls of the split water jacket 12 below the connecting pipe 33 are fixedly connected, and the outer walls of the split water jacket 12 on both sides of the communicating pipe 33 in the auxiliary combustion chamber 4 are respectively fixedly connected to the sides of the adjacent baffle plate 35 through a vertical connecting plate 37; On the baffle plate 35 and the outer wall of the divided water jacket 12 opposite to the baffle plate 35, a number of baffle plates 41 are horizontally fixed and arranged in a staggered manner; the flame in the auxiliary combustion chamber 4 enters between the baffle plate 35 and the divided water jacket 12 In the space, and through each deflector plate 41 from top to bottom for multi-return deflection, so that the flame is fully burned, and then enters the main combustion chamber 3 below the water exchange tank 15 through the communication pipe 33, and the main combustion chamber 3 The flame in chamber 3 mixes and burns again;

The upper part of the main combustion chamber 3 above the main feeding port 9 is horizontally fixed with a water exchange tank 15, and the water exchange tank 15 divides the interior of the body of furnace 2 into a secondary combustion chamber 38 and a primary combustion chamber 39 arranged up and down; 15 communicates with the furnace body water jacket 23, the water in the furnace body water jacket 23 and the water in the heat exchange tank 15 communicate with each other, and the water in the heat exchange tank 15 can fully absorb the heat generated by the fuel combustion in the furnace body 2, absorbing Fast heating and high heat exchange efficiency; the base 1 is a hollow shell, and the cavity inside the base 1 is an air distribution chamber 13, and an air distribution port 14 communicating with the inside of the air distribution chamber 13 is provided on the side wall of the air distribution chamber 13; The cold air outside the furnace body 2 enters the inside of the air distribution chamber 13 through the air distribution port 14;

Below the exhaust port 11, the interior of the main combustion chamber 3 on the top of the heat exchange tank 15 is horizontally fixed with a partition 16, and the main combustion chamber 3 between the partition 16 and the top of the water exchange tank 15 is a combustion chamber 17; The inside of the main combustion chamber 3 below the water tank 15 and the top of the auxiliary combustion chamber 4 are respectively horizontally fixed with an air distribution pipe 18, between the combustion chamber 17 and the air distribution chamber 13, between each air distribution pipe 18 and the air distribution chamber 13 The air supply pipes 20 are connected between each room; the cold air in the air distribution chamber 13 enters the air distribution pipe 18 and the inside of the combustion chamber 17 through the air supply pipe 20, and the cold air absorbs the main combustion chamber 3 and the auxiliary chamber 17 respectively in the process. The heat temperature inside the combustion chamber 4 gradually rises to become high-temperature air, which is basically the same as the ambient temperature inside the furnace body 2 when it reaches the air distribution pipe 20 and the combustion chamber 17; a number of air distribution holes are provided inside the air distribution pipe 18 19. The high-temperature air in the air distribution pipe 18 is evenly distributed to the inside of the corresponding main combustion chamber 3 and auxiliary combustion chamber 4 through the air distribution holes 19 to play a role in supporting combustion and returning to combustion; There are three guide pipes 21, and a wind cap 24 is arranged on the top of the guide pipe 21. The bottom end of the guide pipe 21 is sealed and passes through the bottom of the heat exchange tank 15, and is placed under the corresponding air distribution pipe 18; the top of the guide pipe 21 is sequentially The seal passes through the top of the heat exchange tank 15 and the partition 16, and is placed above the partition 16; a number of air distribution holes 22 are arranged on the pipe wall of the draft tube 21 inside the combustion chamber 17, and the large volume in the primary combustion chamber 39 The flame is divided into several smaller flames through the draft tube 21 and then enters the secondary combustion chamber 38 for secondary combustion. During this process, the high-temperature air inside the combustion chamber 17 enters the draft tube 21 through the air distribution hole 22, It is fully mixed with the inner flame and the middle flame of the flame with a smaller volume in the draft tube 21 to play a combustion-supporting role, so that the flame above the partition 16 can be fully burned; a smoke exhaust port 11 is provided on the side wall of the main combustion chamber 3 ;

When the present invention is applied to heating, a smoke exhaust pipe 25 needs to be connected to the smoke exhaust outlet 11, and the smoke exhaust pipe 25 can be a finned high-efficiency heat exchange smoke pipe (for its specific structure, please refer to the patent document with the application number CN201520110372.X) , or as shown in Figure 4, a smoke exhaust water jacket 26 is set on the outer wall of the smoke exhaust pipe 25, and the waste heat of the flue gas in the smoke exhaust pipe 25 is absorbed and utilized through the smoke exhaust water jacket 26; the smoke exhaust water jacket 26 and the furnace The body water jacket 23 is connected, and the water in the smoke exhaust water jacket 26 and the water in the furnace body water jacket 23 communicate with each other; An insulation layer is provided on the outer wall; five heat collecting pipes 30 are arranged inside the smoke exhaust pipe 25, and the two ends of the heat collecting pipes 30 respectively pass through the pipe wall of the smoke exhaust pipe 25 and are placed inside the smoke exhaust water jacket 26; the heat collecting pipes 30 can improve the smoke exhaust The waste heat utilization rate of the flue gas in the pipe 25; a temperature sensor 27 is arranged on the side wall of the smoke exhaust water jacket 26, and a controller 28 is fixed on the outer wall of the smoke exhaust water jacket 26, and the input end of the temperature sensor 27 and the controller 28 Connect, the output end of controller 28 is connected with circulating water pump 29, and the water outlet of circulating water pump 29 is communicated with the water inlet of furnace body water jacket 23 by pipeline, and the water inlet of circulating water pump 29 is communicated with the return pipe of heating pipe row 40, The water inlet of the heating pipe row 40 is communicated with the water outlet of the smoke exhaust water jacket 26 through a pipeline; the temperature of the circulating water in the smoke exhaust water jacket 26 can be detected in real time through the temperature sensor 27, and the detected temperature information is sent to the control panel. controller 28, the controller 28 compares the received temperature signal from the temperature sensor 27 with the preset temperature value of the controller 28, when the temperature sensor 27 detects that the circulating water temperature in the exhaust water jacket 26 reaches the set During temperature value, controller 28 box circulation water pumps 29 send signal, and circulation water pump 29 starts working, and the circulation water pump in heating pipe row 40 is as in body of heater water jacket 23, and smoke exhaust water jacket 26, furnace cover water jacket 32 1. The water in the heat exchange tank 15 and the water jacket 23 of the furnace body is sequentially discharged through the water outlet of the exhaust water jacket 26 and enters the inside of the heating pipe row 40 until the temperature sensor 27 detects that the temperature of the circulating water in the exhaust water jacket 26 is low. When the temperature value set by the controller 28, the circulating water pump 29 stops working, the controller 28 controls the opening and closing of the circulating water pump 29 according to the temperature of the circulating water in the smoke exhaust water jacket 26 detected by the temperature sensor 27, and then controls the circulation of the circulating water. automatic cycle.

Working principle: Add fuel from the main feeding port 9 and the auxiliary feeding port 10 to the main combustion chamber 3 and the auxiliary combustion chamber 4 respectively, place it above the corresponding grate 5, ignite the fuel, and adjust it to enter the furnace body 2 from the grate 5 The air volume of the fire grate 5 is utilized to oxidize the fuel on the fire grate 5 by the primary combustion air of the fire grate 5 for primary combustion, and the fuel on the fire grate 5 is once burned to produce combustible gas containing incomplete combustion;

Wherein, the incompletely combusted combustible gas in the auxiliary combustion chamber 4 rises to the top of the auxiliary combustion chamber 4 with the flame and then deflects downwards, and mixes with the air discharged from the corresponding furnace cover 8 and the air distribution pipe 18 to return to burning. The burned flame enters the space between the baffle plate 35, the connecting plate 36 and the vertical connecting plate 37, and is deflected multiple times by the deflector 41. After being fully burned, it enters the main combustion chamber below the heat exchange tank 15 through the connecting pipe 33. indoor 3;

The main combustion chamber 3 rises to the primary combustion chamber 39 below the water exchange tank 15 with the flame. 18, and through the air distribution hole 19, it is discharged into the interior of the furnace body 2 below the heat exchange tank 15, and mixed with the flame containing incompletely combustible combustible gas in countercurrent to form a back-burning, which is thrown into the flame after a back-burning Carries some combustible gas that has not been completely burned; the flame after the primary backburning and the backburning flame of the auxiliary combustion chamber 4 sent through the connecting pipe 33 enter the secondary combustion chamber 38 above the partition 16 through the draft tube 21 Inside, during this process, the cold air in the air distribution chamber 13 enters the combustion chamber 17 through the air supply pipe 20, and enters the draft pipe 21 through the air distribution hole 22, and the combustible gas in the flame in the draft pipe 21 Mixing and supporting combustion, so that the flame discharged from the draft tube 21 undergoes secondary combustion inside the secondary combustion chamber 38; The gap between the cover 83 and the lower furnace ring 82 enters into the secondary combustion chamber 38 downwards, and is mixed with the flame after the secondary combustion to carry out secondary back-burning, so that the incompletely combusted combustible gas is further combusted, and the fuel and gas are increased. Combustion rate of combustible gas improves energy utilization rate and reduces emission of harmful gas; the flue gas generated after secondary backburning is discharged through exhaust port 11 and exhaust pipe 25 .

In the above-mentioned combustion process, the combustion-supporting air is provided for the flame combustion in the furnace body 2 through the fire grate 5, the air supply pipe 20, and the furnace cover 8, which greatly reduces the air intake at the bottom of the furnace, and the air intake disturbance effect is significantly reduced. The ashes formed by gasification combustion are not easy to discharge with the flame, and the dust content in the flue gas is greatly reduced; through the heat exchange between the furnace body water jacket 23 and the furnace body 2, the internal ambient temperature of the furnace body 2 is reduced, and the furnace body 2 is absorbed by the furnace cover water jacket 32 The heat on the top prevents the heat from being lost by the furnace cover 8, fully absorbs the heat of the outer flame of the flame through the heat exchange tank 15, reduces the flame combustion temperature, and suppresses the generation of nitrogen oxides; the water jacket 23 of the furnace body, the water jacket 32 of the furnace cover and the heat exchange tank 15 Combined with heat exchange, the heat exchange area ratio is high, the heat exchange efficiency is high, and the heat is greatly reduced with the exhaust gas;

In summary, the dual-fuel boiler of the present invention divides the interior of the furnace body 2 into two combustion chambers, the main combustion chamber 3 and the auxiliary combustion chamber 4, by dividing the water jacket 12, so that fuels with different gasification and combustion conditions can be Combustion is carried out in two combustion chambers, and the combustion is sufficient, which can effectively improve the combustion efficiency of raw materials and avoid waste of raw materials;

By adjusting the air intake at the bottom of the fire grate 5, the fuel can be combusted once, and the water exchange tank 15 divides the inside of the furnace body 2 into a secondary combustion chamber 38 and a primary combustion chamber 39 arranged up and down. The large-volume flame is divided into several small-volume flames through the guide pipe 21, and the flame in the primary combustion chamber 39 hits the bottom of the heat exchange tank 15, and after the flame is deflected and mixed with the secondary combustion-supporting air discharged from the air distribution pipe 18, the flame returns once. combustion, and the air in the combustion chamber 17 enters the draft pipe 21 through the air distribution hole 22 on the draft pipe 21 and can fully mix with the flame inside to play the role of three combustion aids. The air enters through the unique double-layer furnace cover The secondary combustion chamber 38 and its internal flame carry out four times of combustion-supporting to form a secondary back-burning. The dual-fuel boiler of the present invention realizes multi-fuel sub-furnace combustion, especially in the main combustion chamber 3, realizes multi-stage combustion and multi-stage back-burning , Combustion for many times, so that the fuel and combustible gas can be fully burned, the content of dust and carbon monoxide in the flue gas is greatly reduced, and the discharge standard can be achieved.

If the following modifications are made on the basis of the dual-fuel boiler described in the present invention: the split water jacket 12, the furnace body water jacket 23, the smoke exhaust water jacket 26, and the furnace cover water jacket 32 are removed, and the heat exchange tank 15 is changed to Separator; the modified boiler also has the advantages of sufficient combustion of fuel, less dust in flue gas, and high energy utilization rate, and can be directly used for heating, which is also within the protection scope of the present invention.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (11)

1. A dual-fuel boiler, which includes a base, a furnace body, a main combustion chamber, an auxiliary combustion chamber, a fire grate, and an ash storage tank. The furnace body is provided on the top of the base, and a furnace body water jacket, the main combustion chamber and the auxiliary combustion chamber arranged left and right are arranged inside the furnace body, and the main combustion chamber and the auxiliary combustion chamber are communicated through a communication pipe, and the main combustion chamber is connected to the main combustion chamber. There is a furnace cover inside the furnace mouth on the top of the chamber, the fire grate and the ash storage tank are arranged up and down in the lower part of the main combustion chamber and the auxiliary combustion chamber, and the fire grate above the fire grate The side walls of the main combustion chamber and the auxiliary combustion chamber are respectively provided with a main feeding port and an auxiliary feeding port, and a slag cleaning port is provided on the side wall of the auxiliary combustion chamber between the auxiliary feeding port and the grate , a smoke outlet is provided on the side wall of the main combustion chamber; it is characterized in that the base is a hollow shell, the cavity inside the base is an air distribution chamber, and on the side wall of the air distribution chamber An air distribution port communicating with the interior of the air distribution chamber is provided; a water exchange tank is fixed horizontally on the upper part of the main combustion chamber above the main feeding port, and the water exchange tank communicates with the water jacket of the furnace body ; Below the smoke exhaust port, the inside of the main combustion chamber on the top of the water exchange tank is horizontally fixed with a partition, and the main combustion chamber between the partition and the top of the water exchange tank is a combustion-supporting chamber. chamber; a ring-shaped air distribution pipe is fixed horizontally on the inside of the main combustion chamber below the water exchange tank and on the top of the auxiliary combustion chamber, and a number of air distribution holes are arranged on the inner side of the air distribution pipe; An air supply pipe is connected between the combustion chamber and the air distribution chamber, and between each of the air distribution pipes and the air distribution chamber; More than one guide tube is vertically sealed inside the heat exchange tank, and the bottom end of the guide tube seals through the bottom of the heat exchange tank and is placed under the corresponding air distribution pipe; The top of the draft pipe seals through the top of the heat exchange tank and the partition in turn, and is placed above the partition; a number of air distribution holes are arranged on the wall of the draft pipe inside the combustion chamber; A split water jacket is vertically provided inside the furnace body, and the split water jacket communicates with the furnace body water jacket; the inside of the furnace body on one side of the split water jacket is the main combustion chamber, so The interior of the furnace body on the other side of the split water jacket is the auxiliary combustion chamber; a communication pipe is sealed and inserted in the middle of the split water jacket, and one end of the communication pipe is placed above the main feeding port inside the main combustion chamber, and the other end of the communication pipe is placed inside the auxiliary combustion chamber above the auxiliary feeding port. 2. The dual-fuel boiler according to claim 1, characterized in that the grate is a grate with adjustable spacing between bars. 3. The dual-fuel boiler according to claim 1, characterized in that a damper is provided on the side wall of the furnace body between the grate and the ash storage tank. 4. The dual-fuel boiler according to claim 1, characterized in that a wind cap is provided on the top of the draft tube. 5. The dual-fuel boiler according to claim 1, characterized in that, a baffle plate opposite to the connecting pipe is vertically provided inside the auxiliary combustion chamber, and the top of the baffle plate is placed on the corresponding Below the air distribution pipe, the bottom end of the baffle is fixedly connected to the outer wall of the split water jacket below the communication pipe through a horizontal connecting plate, and the two sides of the communication pipe in the auxiliary combustion chamber are The outer wall of the split water jacket is fixedly connected to the side of the adjacent said baffle through a vertical connecting plate respectively. 6. The dual-fuel boiler according to claim 5, characterized in that, on the baffle plate and the outer wall of the split water jacket opposite to the baffle plate, a number of baffles arranged in a staggered manner are horizontally fixed respectively . 7. The dual-fuel boiler according to any one of claims 1, 2, 3, 4, 5 or 6, characterized in that the furnace cover is provided inside the furnace mouth at the top of the auxiliary combustion chamber. 8. The dual-fuel boiler according to any one of claims 1, 2, 3, 4, 5 or 6, characterized in that, the furnace cover is a double-layer furnace cover, and the double-layer furnace cover includes a support tube, a lower The furnace ring, the lower furnace cover, the upper furnace ring, and the upper furnace cover, the lower nozzle of the support tube is placed inside the corresponding furnace port, and the lower furnace ring is movable on the top of the lower nozzle of the support tube, The lower furnace cover is provided on the top part of the center hole of the lower furnace ring; the upper furnace ring is movable on the top of the upper nozzle of the support tube, and The upper furnace cover is provided. 9. The dual-fuel boiler according to claim 7, wherein the furnace cover is a double-layer furnace cover, and the double-layer furnace cover includes a support tube, a lower furnace ring, a lower furnace cover, an upper furnace ring, an upper The furnace cover, the lower nozzle of the support tube is placed inside the corresponding furnace mouth, the lower furnace ring is movable on the top of the lower nozzle of the support tube, and the top of the central hole of the lower furnace ring is divided The lower furnace cover is provided; the upper furnace ring is movable on the top of the upper nozzle of the support tube, and the upper furnace cover is partially provided on the top of the center hole of the upper furnace ring. 10. The dual-fuel boiler according to claim 8, characterized in that, a smoke exhaust pipe is connected to the smoke exhaust port, and a smoke exhaust water jacket is provided on the outer wall of the smoke exhaust pipe; The top of the furnace body is provided with a furnace cover water jacket, and the furnace cover water jacket is respectively connected with the smoke exhaust water jacket and the furnace body water jacket. 11. The dual-fuel boiler according to claim 9, characterized in that a smoke exhaust pipe is connected to the smoke exhaust port, and a smoke exhaust water jacket is provided on the outer wall of the smoke exhaust pipe; The top of the furnace body is provided with a furnace cover water jacket, and the furnace cover water jacket is respectively connected with the smoke exhaust water jacket and the furnace body water jacket.

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