CN109654481B - Natural gas mixed fuel boiler and method - Google Patents
Natural gas mixed fuel boiler and method Download PDFInfo
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- CN109654481B CN109654481B CN201811578515.4A CN201811578515A CN109654481B CN 109654481 B CN109654481 B CN 109654481B CN 201811578515 A CN201811578515 A CN 201811578515A CN 109654481 B CN109654481 B CN 109654481B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
- F23C1/08—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air liquid and gaseous fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
- F23K5/14—Details thereof
- F23K5/22—Vaporising devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2300/00—Pretreatment and supply of liquid fuel
- F23K2300/20—Supply line arrangements
- F23K2300/205—Vaporising
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Abstract
The invention discloses a natural gas mixed fuel boiler, which comprises a vertical cylindrical boiler outer shell, wherein a cylindrical first inner shell is coaxially arranged inside the boiler outer shell, and a cylindrical second inner shell is coaxially arranged inside the first inner shell; a columnar third inner shell is coaxially arranged inside the second inner shell; the disturbance blade continuously disturbs the mixed gas of the ethanol steam and the natural gas in the mixed gas disturbance pressure accumulation chamber, so that the continuously homogeneous ethanol steam natural gas mixed fuel is generated in the mixed gas disturbance pressure accumulation chamber; the scheme enables the ethanol to be mixed with the natural gas in the evaporation process and then injected into the combustion cavity in the form of mixed gas, and the effect of pure gas combustion is achieved.
Description
Technical Field
The invention belongs to the field of boilers.
Background
The natural gas fuel has the characteristics of high combustion efficiency and high heat value, and the renewable ethanol fuel is liquid at normal temperature, cannot enter in a gas form like natural gas when being supplied into a hearth, is easy to generate the phenomenon of uneven combustion, and is more difficult to be used as mixed fuel.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a natural gas mixed fuel boiler and a method for fully combusting natural gas mixed fuel.
The technical scheme is as follows: in order to achieve the purpose, the natural gas mixed fuel boiler comprises a vertical cylindrical boiler outer shell, wherein a cylindrical first inner shell is coaxially arranged inside the boiler outer shell, and a cylindrical second inner shell is coaxially arranged inside the first inner shell; a columnar third inner shell is coaxially arranged inside the second inner shell;
a gap formed between the boiler outer shell and the first inner shell is a flue gas heat exchange layer, a gap formed between the first inner shell and the second inner shell is a combustion air supply layer, and an annular columnar combustion chamber is formed between the second inner shell and the third inner shell; the inside of the third inner shell is a mixed gas disturbance pressure accumulation chamber; a heat exchange water pipe is spirally and spirally arranged in the combustion chamber; a rotary disturbance shaft is rotationally arranged in the mixed gas disturbance pressure accumulation chamber, and a plurality of disturbance blades are distributed on the shaft wall of the rotary disturbance shaft in an array manner; the driving motor is in driving connection with the rotary disturbance shaft;
a plurality of smoke exhaust channels are uniformly distributed on the wall body at the lower end of the combustion chamber in a circumferential array, and the lower end of the combustion chamber and the lower end of the smoke heat exchange layer are communicated with each other through the smoke exhaust channels; a plurality of gas outlet holes are uniformly distributed on the wall body of the third inner shell in a circumferential array, and pressure-accumulated gas in the mixed gas disturbance pressure-accumulation chamber can be led out to the combustion chamber through the gas outlet holes; a plurality of combustion-supporting air outlet holes are uniformly distributed on the wall body of the second inner shell in a circumferential array, and pressure-accumulating combustion-supporting air in a combustion-supporting air supply layer can be led out into the combustion chamber through the combustion-supporting air outlet holes; an electronic ignition device is further arranged in the combustion chamber.
The inlet end of the main smoke exhaust pipe is communicated with the top end of the smoke heat exchange layer; the top of the second inner shell is provided with a conical drainage top wall, the conical tip of the drainage top wall is arranged upwards, and the top end of the third inner shell is integrally connected with the lower end face of the drainage top wall; a combustion air inlet cavity is formed between the drainage top wall and the top shell wall of the first inner shell, and the bottom profile of the combustion air inlet cavity is communicated with the top end of the combustion air supply layer; the top of boiler shell body still is provided with combustion-supporting air pressure boost centrifugal fan, combustion-supporting air pressure boost centrifugal fan's play tuber pipe export stretches into combustion-supporting air advances the intracavity, just it is located to go out the tuber pipe export directly over the circular cone tip at drainage top.
Further, a hard fuel supply pipe is spirally and spirally arranged in the smoke heat exchange layer coaxially in a spiral manner, the fuel supply pipe is tightly clamped between the inner wall of the outer shell of the boiler and the outer wall of the first inner shell, and the spiral fuel supply pipe divides the middle section of the smoke heat exchange layer into spiral heat exchange channels;
the fuel supply pipe is internally provided with a spiral fuel channel; the fuel gas supply device also comprises a plurality of transverse fuel gas transition pipes, wherein the plurality of fuel gas transition pipes are distributed in an equidistant array along the vertical direction, and the distance between every two adjacent fuel gas transition pipes is the same as the spiral distance of the fuel supply pipe; the inlet end of each gas transition pipe is transversely communicated with the fuel channel, the outlet end of each gas transition pipe is communicated with the mixed gas disturbance pressure accumulation chamber, and the inlet end of each gas transition pipe is positioned above the liquid level of ethanol liquid flowing in the fuel channel;
the spiral lower end of the fuel supply pipe is plugged; the spiral upper end of the fuel supply pipe is communicated with and obliquely provided with a fuel introducing pipe; the gas outlet end of the natural gas supply device is communicated with the gas inlet end of the fuel inlet pipe; the fuel injection device also comprises an ethanol liquid supply pipe, and the liquid outlet end of the ethanol liquid supply pipe is connected with the side part of the fuel introducing pipe in a bypass mode.
Further, the method for supplying the natural gas mixed fuel boiler comprises the following steps:
step one, a single fuel supply and pre-combustion process: the method comprises the following steps that firstly, natural gas is continuously led into a fuel leading-in pipe through a natural gas supply device, then the natural gas is continuously led into a fuel supply pipe, further the air pressure in a fuel channel in the fuel supply pipe is gradually increased, further the natural gas in the fuel channel is continuously led into a mixed gas disturbance pressure accumulation chamber through a gas transition pipe, further continuous natural gas pressure accumulation gas is formed in the mixed gas disturbance pressure accumulation chamber, and further the natural gas pressure accumulation gas in the mixed gas disturbance pressure accumulation chamber is uniformly led out to a combustion chamber through a plurality of gas leading-out holes; meanwhile, a combustion-supporting air pressurization centrifugal fan is started, so that pressure-accumulating air is formed in a combustion-supporting air supply layer, and the pressure-accumulating combustion-supporting air in the combustion-supporting air supply layer is uniformly led out to the combustion chamber through a plurality of combustion-supporting air leading-out holes; the natural gas uniformly led out from the plurality of gas leading-out holes and the combustion air led out from the plurality of combustion air leading-out holes are uniformly distributed in the combustion chamber and are mutually fused; starting an electronic ignition device in the combustion chamber, igniting the electronic ignition device in the combustion chamber, generating continuous combustion flame, and continuously heating cold water flowing through the heat exchange water pipe; meanwhile, high-temperature flue gas generated by combustion in the combustion chamber is discharged to the lower end of the flue gas heat exchange layer through the plurality of smoke discharge channels, then the high-temperature flue gas at the lower end of the flue gas heat exchange layer flows through the spiral heat exchange channel at the position of the fuel supply pipe, enters the upper end of the flue gas heat exchange layer and is finally discharged through the main smoke discharge pipe, and the fuel supply pipe is continuously heated by the high-temperature flue gas in the process that the high-temperature flue gas flows through the spiral heat exchange channel at the position of the fuel supply pipe until the temperature of the pipe wall of the fuel supply pipe rises to a continuous high-temperature state above;
step two, mixed fuel supply and combustion process:
when the temperature of the pipe wall of the fuel supply pipe is in a continuous high-temperature state of continuously more than 150 ℃, the flow rate of natural gas which is continuously introduced into the fuel introduction pipe by a natural gas supply device is reduced, then the ethanol liquid is continuously introduced into the fuel introduction pipe by an ethanol liquid supply pipe, further, the natural gas and the ethanol liquid are simultaneously introduced into a fuel channel in the fuel supply pipe through the fuel introduction pipe, the liquid flowing in the fuel channel is always in a half-filling state by controlling the flow rate of the ethanol liquid introduced into the fuel introduction pipe, further, a spiral gas channel is formed above the liquid level of the ethanol liquid flowing in the fuel channel, and the inlet end of each fuel gas transition pipe is communicated with the gas channel; the ethanol liquid is continuously heated by the wall of the fuel supply pipe in a high-temperature state in the flowing process of the ethanol liquid in the fuel passage, so that the ethanol flowing in the fuel passage is in a continuous evaporation and gasification state, and the ethanol is completely gasified when the ethanol flowing in the fuel passage flows to a position close to the lower end of the spiral of the fuel supply pipe; the ethanol gas generated by continuous evaporation and gasification of the ethanol flowing in the fuel channel is primarily fused with the natural gas in the gas channel, then the mixed gas of the ethanol steam and the natural gas in the gas channel is led into the gas transition pipe through the inlet end of the gas transition pipe, and the primarily mixed gas of the ethanol steam and the natural gas is continuously led into the mixed gas disturbance pressure accumulation chamber, then the driving motor is started to further enable the rotary disturbance shaft to continuously rotate, further enable the plurality of disturbance blades to continuously disturb the mixed gas of the ethanol steam and the natural gas in the mixed gas disturbance pressure accumulation chamber, and further enable the mixed gas disturbance pressure accumulation chamber to generate continuously homogeneous ethanol steam natural gas mixed fuel; then the homogeneous ethanol steam natural gas mixed fuel is uniformly led out to the combustion chamber through a plurality of fuel gas leading-out holes; the homogeneous ethanol steam natural gas mixed fuel uniformly led out from the plurality of gas outlet holes and the combustion air led out from the plurality of combustion air outlet holes are uniformly distributed in the combustion chamber and are mutually fused, and then the combustion chamber generates continuous mixed fuel flame, so that cold water flowing through the heat exchange water pipe is continuously heated; meanwhile, high-temperature flue gas generated by combustion in the combustion chamber is discharged to the lower end of the flue gas heat exchange layer through the smoke discharge channels, then the high-temperature flue gas at the lower end of the flue gas heat exchange layer flows through the spiral heat exchange channel at the position of the fuel supply pipe and then enters the upper end of the flue gas heat exchange layer, and finally the high-temperature flue gas is discharged through the main smoke discharge pipe.
Has the advantages that: the disturbance blade continuously disturbs the mixed gas of the ethanol steam and the natural gas in the mixed gas disturbance pressure accumulation chamber, so that the continuously homogeneous ethanol steam natural gas mixed fuel is generated in the mixed gas disturbance pressure accumulation chamber; the scheme enables the ethanol to be mixed with the natural gas in the evaporation process and then injected into the combustion cavity in the form of mixed gas, and the effect of pure gas combustion is achieved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the scheme;
FIG. 2 is a first perspective cross-sectional view of FIG. 1;
FIG. 3 is a second perspective cross-sectional view of FIG. 1;
FIG. 4 is a schematic front cross-sectional view of FIG. 1;
FIG. 5 is an enlarged fragmentary view at 10 of FIG. 4;
fig. 6 is a perspective view of fig. 5.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The natural gas mixed fuel boiler shown in the attached fig. 1 to 6 comprises a vertical cylindrical boiler outer shell 7, wherein a cylindrical first inner shell 20 is coaxially arranged inside the boiler outer shell 7, and a cylindrical second inner shell 18 is coaxially arranged inside the first inner shell 20; a columnar third inner shell 5 is coaxially arranged inside the second inner shell 18;
a gap formed between the boiler outer shell 7 and the first inner shell 20 is a flue gas heat exchange layer 13, a gap formed between the first inner shell 20 and the second inner shell 18 is a combustion air supply layer 21, and an annular columnar combustion chamber 14 is formed between the second inner shell 18 and the third inner shell 5; the inside of the third inner shell 5 is a mixed gas disturbance pressure accumulation chamber 6; a heat exchange water pipe 22 is spirally and spirally arranged in the combustion chamber 14; a rotary disturbance shaft 2 is rotationally arranged in the mixed gas disturbance pressure accumulation chamber 6, and a plurality of disturbance blades 2 are distributed on the shaft wall of the rotary disturbance shaft 2 in an array manner; the device also comprises a driving motor 3, wherein the driving motor 3 is in driving connection with the rotary disturbance shaft 2;
a plurality of smoke exhaust channels 4 are uniformly distributed on the wall body at the lower end of the combustion chamber 14 in a circumferential array, and the lower end of the combustion chamber 14 and the lower end of the smoke heat exchange layer 13 are communicated with each other through the smoke exhaust channels 4; a plurality of gas outlet holes 23 are uniformly distributed on the wall body of the third inner shell 5 in a circumferential array, and the pressure-accumulated gas in the mixed gas disturbance pressure-accumulation chamber 6 can be led out to the combustion chamber 14 through the plurality of gas outlet holes 23; a plurality of combustion air outlet holes 17 are uniformly distributed on the wall body of the second inner shell 18 in a circumferential array, and pressure-accumulating combustion air in the combustion air supply layer 21 can be led out to the combustion chamber 14 through the plurality of combustion air outlet holes 17; an electronic ignition device is also arranged in the combustion chamber 14.
The flue gas heat exchange layer further comprises a total smoke exhaust pipe 28, and the inlet end of the total smoke exhaust pipe 28 is communicated with the top end of the flue gas heat exchange layer 13; the top of the second inner shell 18 is provided with a conical drainage top wall 25, the conical tip of the drainage top wall 25 is arranged upwards, and the top end of the third inner shell 5 is integrally connected with the lower end face of the drainage top wall 25; a combustion air inlet cavity 01 is formed between the drainage top wall 25 and the top shell wall 24 of the first inner shell 20, and the bottom contour of the combustion air inlet cavity 01 is communicated with the top end of the combustion air supply layer 21; the top of boiler shell body 7 still is provided with combustion-supporting air pressure boost centrifugal fan 26, combustion-supporting air pressure boost centrifugal fan 26's play tuber pipe 27 export stretches into in the combustion-supporting air admits air chamber 01, just it is located to go out tuber pipe 27 export directly over the circular cone tip of drainage top 25.
Hard fuel supply pipes 8 are spirally arranged in the flue gas heat exchange layer 13 coaxially in a spiral manner, the fuel supply pipes 8 are tightly clamped between the inner wall of the boiler outer shell 7 and the outer wall of the first inner shell 20, and the middle section of the flue gas heat exchange layer 13 is divided into spiral heat exchange channels 9 by the spiral fuel supply pipes 8;
a spiral fuel channel 8.1 is arranged in the fuel supply pipe 8; the fuel gas supply device also comprises a plurality of transverse fuel gas transition pipes 11, wherein the plurality of fuel gas transition pipes 11 are distributed in an equidistant array along the vertical direction, and the distance between every two adjacent fuel gas transition pipes 11 is the same as the spiral distance of the fuel supply pipe 8; the inlet end 11.1 of each gas transition pipe 11 is transversely communicated with the fuel channel 8.1, the outlet end of each gas transition pipe 11 is communicated with the mixed gas disturbance pressure accumulation chamber 6, and the inlet end 11.1 of each gas transition pipe 11 is positioned above the liquid level 8.2 of ethanol liquid flowing in the fuel channel 8.1;
the spiral lower end of the fuel supply pipe 8 is blocked; the spiral upper end of the fuel supply pipe 8 is communicated with and obliquely provided with a fuel introducing pipe 30; the fuel supply device also comprises a natural gas supply device, wherein the gas outlet end of the natural gas supply device is communicated with the gas inlet end of the fuel introducing pipe 30; the fuel injection device further comprises an ethanol liquid supply pipe 31, and the liquid outlet end of the ethanol liquid supply pipe 31 is connected with the side part of the fuel introducing pipe 30 in a bypass mode.
The method, the steps and the technical progress of the scheme are as follows:
step one, a single fuel supply and pre-combustion process:
firstly, continuously introducing natural gas into a fuel introducing pipe 30 through a natural gas supply device, then continuously introducing the natural gas into a fuel supply pipe 8, further gradually increasing the air pressure in a fuel channel 8.1 in the fuel supply pipe 8, further continuously introducing the natural gas in the fuel channel 8.1 into a mixed gas disturbance pressure accumulation chamber 6 through a gas transition pipe 11, further forming continuous natural gas pressure accumulation gas in the mixed gas disturbance pressure accumulation chamber 6, and further uniformly leading the natural gas pressure accumulation gas in the mixed gas disturbance pressure accumulation chamber 6 out to a combustion chamber 14 through a plurality of gas leading-out holes 23; meanwhile, the combustion-supporting air pressurizing centrifugal fan 26 is started, so that pressure-accumulating air is formed in the combustion-supporting air supply layer 21, and the pressure-accumulating combustion-supporting air in the combustion-supporting air supply layer 21 is uniformly led out to the combustion chamber 14 through the combustion-supporting air outlet holes 17; further, the natural gas uniformly led out from the plurality of gas outlet holes 23 and the combustion air led out from the plurality of combustion air outlet holes 17 are uniformly distributed in the combustion chamber 14 and are mutually fused; at this time, the electronic ignition device in the combustion chamber 14 is started, so that the combustion chamber 14 is ignited, and a continuous combustion flame is generated, so that the cold water flowing through the heat exchange water pipe 22 is continuously heated; meanwhile, high-temperature flue gas generated by combustion in the combustion chamber 14 is discharged to the lower end of the flue gas heat exchange layer 13 through the smoke discharge channels 4, then the high-temperature flue gas at the lower end of the flue gas heat exchange layer 13 flows through the spiral heat exchange channel 9 at the position of the fuel supply pipe 8 and then enters the upper end of the flue gas heat exchange layer 13, and finally is discharged through the total smoke discharge pipe 28, and in the process that the high-temperature flue gas flows through the spiral heat exchange channel 9 at the position of the fuel supply pipe 8, the fuel supply pipe 8 is continuously heated by the high-temperature flue gas until the temperature of the pipe wall of the fuel supply pipe 8 rises to a continuous high-temperature state above 150 ℃;
step two, mixed fuel supply and combustion process:
when the wall temperature of the fuel supply pipe 8 is a continuous high temperature state of continuously over 150 ℃, the flow of natural gas from a natural gas supply device to a fuel introducing pipe 30 is reduced, then an ethanol liquid supply pipe 31 continuously introduces ethanol liquid into the fuel introducing pipe 30, further the natural gas and the ethanol liquid are simultaneously introduced into a fuel channel 8.1 in the fuel supply pipe 8 through the fuel introducing pipe 30, the liquid flowing in the fuel channel 8.1 is always in a half-filling state by controlling the flow rate of the ethanol liquid introduced into the fuel introducing pipe 30, further a spiral gas channel 8.3 is formed above the liquid level 8.2 of the ethanol liquid flowing in the fuel channel 8.1, and the inlet end 11.1 of each gas transition pipe 11 is communicated with the gas channel 8.3; the ethanol liquid is continuously heated by the pipe wall of the fuel supply pipe 8 in a high-temperature state in the process of flowing in the fuel channel 8.1, so that the ethanol flowing in the fuel channel 8.1 is in a continuous evaporation and gasification state, and the ethanol flowing in the fuel channel 8.1 is completely gasified when flowing to the position close to the spiral lower end of the fuel supply pipe 8; ethanol gas generated by continuous evaporation and gasification of ethanol flowing in the fuel channel 8.1 is primarily fused with natural gas in the gas channel 8.3, mixed gas of ethanol steam and natural gas in the gas channel 8.3 is further led into the gas transition pipe 11 through the inlet end 11.1 of the gas transition pipe 11, and the primarily mixed gas of the ethanol steam and the natural gas is further continuously led into the mixed gas disturbance pressure accumulation chamber 6, then the driving motor 3 is started to further enable the rotary disturbance shaft 2 to continuously rotate, further the plurality of disturbance blades 2 continuously disturb mixed gas of the ethanol steam and the natural gas in the mixed gas disturbance pressure accumulation chamber 6, and further continuous homogeneous ethanol steam natural gas mixed fuel is generated in the mixed gas disturbance pressure accumulation chamber 6; then the homogeneous ethanol steam natural gas mixed fuel is uniformly led out to the combustion chamber 14 through a plurality of fuel gas leading-out holes 23; the homogeneous ethanol steam natural gas mixed fuel uniformly led out from the plurality of gas outlet holes 23 and the combustion air led out from the plurality of combustion air outlet holes 17 are uniformly distributed in the combustion chamber 14 and are mutually fused, so that the combustion chamber 14 generates continuous mixed fuel flame, and further, cold water flowing through the heat exchange water pipe 22 is continuously heated; meanwhile, high-temperature flue gas generated by combustion in the combustion chamber 14 is discharged to the lower end of the flue gas heat exchange layer 13 through the smoke exhaust channels 4, then the high-temperature flue gas at the lower end of the flue gas heat exchange layer 13 flows through the spiral heat exchange channel 9 at the position of the fuel supply pipe 8 and then enters the upper end of the flue gas heat exchange layer 13, and finally is discharged through the main smoke exhaust pipe 28, so that the fuel supply pipe 8 is continuously heated by the high-temperature flue gas in the process that the high-temperature flue gas flows through the spiral heat exchange channel 9 at the position of the fuel supply pipe 8, the temperature of the pipe wall of the fuel supply pipe 8 is kept to be raised to a continuous high-temperature state above 150 ℃, and further stable operation of.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (2)
1. The natural gas mixed fuel boiler is characterized in that: the boiler comprises a vertical cylindrical boiler outer shell (7), wherein a cylindrical first inner shell (20) is coaxially arranged inside the boiler outer shell (7), and a cylindrical second inner shell (18) is coaxially arranged inside the first inner shell (20); a columnar third inner shell (5) is coaxially arranged inside the second inner shell (18);
a gap formed between the boiler outer shell (7) and the first inner shell (20) is a flue gas heat exchange layer (13), a gap formed between the first inner shell (20) and the second inner shell (18) is a combustion air supply layer (21), and an annular columnar combustion chamber (14) is formed between the second inner shell (18) and the third inner shell (5); the inside of the third inner shell (5) is a mixed gas disturbance pressure accumulation chamber (6); a heat exchange water pipe (22) is spirally and spirally arranged in the combustion chamber (14); a rotary disturbance shaft (2) is rotationally arranged in the mixed gas disturbance pressure accumulation chamber (6), and a plurality of disturbance blades (2) are distributed on the shaft wall of the rotary disturbance shaft (2) in an array manner; the device also comprises a driving motor (3), wherein the driving motor (3) is in driving connection with the rotary disturbance shaft (2);
a plurality of smoke exhaust channels (4) are uniformly distributed on the wall body at the lower end of the combustion chamber (14) in a circumferential array manner, and the lower end of the combustion chamber (14) and the lower end of the smoke heat exchange layer (13) are communicated with each other through each smoke exhaust channel (4); a plurality of gas outlet holes (23) are uniformly distributed on the wall body of the third inner shell (5) in a circumferential array manner, and pressure-accumulated gas in the mixed gas disturbance pressure accumulation chamber (6) can be led out to the combustion chamber (14) through the plurality of gas outlet holes (23); a plurality of combustion-supporting air outlet holes (17) are uniformly distributed on the wall body of the second inner shell (18) in a circumferential array manner, and pressure-accumulating combustion-supporting air in the combustion-supporting air supply layer (21) can be led out to the combustion chamber (14) through the plurality of combustion-supporting air outlet holes (17); an electronic ignition device is also arranged in the combustion chamber (14);
the inlet end of the total smoke exhaust pipe (28) is communicated with the top end of the smoke heat exchange layer (13); the top of the second inner shell (18) is provided with a conical drainage top wall (25), the conical tip of the drainage top wall (25) is arranged upwards, and the top end of the third inner shell (5) is integrally connected with the lower end face of the drainage top wall (25); a combustion air inlet cavity (01) is formed between the drainage top wall (25) and the top shell wall (24) of the first inner shell (20), and the bottom profile of the combustion air inlet cavity (01) is communicated with the top end of the combustion air supply layer (21); a combustion-supporting air pressurization centrifugal fan (26) is further arranged above the top of the boiler outer shell (7), an outlet of an air outlet pipe (27) of the combustion-supporting air pressurization centrifugal fan (26) extends into the combustion-supporting air inlet cavity (01), and an outlet of the air outlet pipe (27) is located right above a conical tip of the drainage top (25);
hard fuel supply pipes (8) are spirally arranged in the smoke heat exchange layer (13) coaxially in a spiral manner, the fuel supply pipes (8) are tightly clamped between the inner wall of the boiler outer shell (7) and the outer wall of the first inner shell (20), and the middle section of the smoke heat exchange layer (13) is divided into spiral heat exchange channels (9) by the spiral fuel supply pipes (8);
a spiral fuel channel (8.1) is arranged in the fuel supply pipe (8); the fuel gas supply device is characterized by also comprising a plurality of transverse fuel gas transition pipes (11), wherein the plurality of fuel gas transition pipes (11) are distributed in an equidistant array along the vertical direction, and the distance between every two adjacent fuel gas transition pipes (11) is the same as the spiral distance of the fuel supply pipe (8); the inlet end (11.1) of each gas transition pipe (11) is transversely communicated with the fuel channel (8.1), the outlet end of each gas transition pipe (11) is communicated with the mixed gas disturbance pressure accumulation chamber (6), and the inlet end (11.1) of each gas transition pipe (11) is positioned above the liquid level (8.2) of ethanol liquid flowing in the fuel channel (8.1);
the spiral lower end of the fuel supply pipe (8) is plugged; the spiral upper end of the fuel supply pipe (8) is communicated with and obliquely provided with a fuel introducing pipe (30); the fuel supply device also comprises a natural gas supply device, and the gas outlet end of the natural gas supply device is communicated with the gas inlet end of the fuel introducing pipe (30); the fuel injection device also comprises an ethanol liquid supply pipe (31), and the liquid outlet end of the ethanol liquid supply pipe (31) is connected with the side part of the fuel introducing pipe (30) in a bypass mode.
2. The fuel supply method of a natural gas mixed fuel boiler according to claim 1, characterized in that:
step one, a single fuel supply and pre-combustion process: the method comprises the steps that firstly, natural gas is continuously led into a fuel lead-in pipe (30) through a natural gas supply device, then the natural gas is continuously led into a fuel supply pipe (8), further, the air pressure in a fuel channel (8.1) in the fuel supply pipe (8) is gradually increased, further, the natural gas in the fuel channel (8.1) is continuously led into a mixed gas disturbance pressure accumulation chamber (6) through a gas transition pipe (11), further, continuous natural gas pressure accumulation gas is formed in the mixed gas disturbance pressure accumulation chamber (6), and further, the natural gas pressure accumulation gas in the mixed gas disturbance pressure accumulation chamber (6) is uniformly led out into a combustion chamber (14) through a plurality of gas leading-out holes (23); meanwhile, a combustion-supporting air pressurization centrifugal fan (26) is started, so that pressure-accumulating air is formed in a combustion-supporting air supply layer (21), and the pressure-accumulating combustion-supporting air in the combustion-supporting air supply layer (21) is uniformly led out to the combustion chamber (14) through a plurality of combustion-supporting air outlet holes (17); further, natural gas uniformly led out from the plurality of gas leading-out holes (23) and combustion-supporting air led out from the plurality of combustion-supporting air leading-out holes (17) are uniformly distributed in the combustion chamber (14) and are mutually fused; starting an electronic ignition device in the combustion chamber (14) at the moment, so that the combustion chamber (14) is ignited, continuous combustion flame is generated, and cold water flowing through the heat exchange water pipe (22) is continuously heated; meanwhile, high-temperature flue gas generated by combustion in the combustion chamber (14) is discharged to the lower end of the flue gas heat exchange layer (13) through the smoke discharge channels (4), then the high-temperature flue gas at the lower end of the flue gas heat exchange layer (13) flows through the spiral heat exchange channel (9) at the position of the fuel supply pipe (8) and then enters the upper end of the flue gas heat exchange layer (13), and finally is discharged through the total smoke discharge pipe (28), and in the process that the high-temperature flue gas flows through the spiral heat exchange channel (9) at the position of the fuel supply pipe (8), the fuel supply pipe (8) is continuously heated by the high-temperature flue gas until the temperature of the pipe wall of the fuel supply pipe (8) rises to a continuous high-temperature state above 150 ℃;
step two, mixed fuel supply and combustion process:
when the wall temperature of the fuel supply pipe (8) is in a continuous high-temperature state of continuously over 150 ℃, the flow of natural gas from a natural gas supply device to a fuel introducing pipe (30) is reduced, then an ethanol liquid supply pipe (31) continuously introduces ethanol liquid into the fuel introducing pipe (30), further natural gas and the ethanol liquid are simultaneously introduced into a fuel channel (8.1) in the fuel supply pipe (8) through the fuel introducing pipe (30), the liquid flowing in the fuel channel (8.1) is always in a half-filling state by controlling the flow of the ethanol liquid introduced into the fuel introducing pipe (30), further a spiral gas channel (8.3) is formed above the liquid level (8.2) of the ethanol liquid flowing in the fuel channel (8.1), and the inlet end (11.1) of each gas transition pipe (11) is communicated with the gas channel (8.3); the ethanol liquid is continuously heated by the pipe wall of the fuel supply pipe (8) in a high-temperature state in the flowing process of the ethanol liquid in the fuel passage (8.1), further the ethanol flowing in the fuel passage (8.1) is in a continuous evaporation and gasification state, and the ethanol flowing in the fuel passage (8.1) is completely gasified when flowing to a position close to the spiral lower end of the fuel supply pipe (8); ethanol gas generated by continuous evaporation and gasification of ethanol flowing in the fuel channel (8.1) is preliminarily fused with natural gas in the gas channel (8.3), mixed gas of ethanol steam and natural gas in the gas channel (8.3) is introduced into the gas transition pipe (11) through the inlet end (11.1) of the gas transition pipe (11), and further the preliminary mixed gas of the ethanol steam and the natural gas is continuously introduced into the mixed gas disturbance pressure accumulation chamber (6), then the driving motor (3) is started to further enable the rotary disturbance shaft (2) to continuously rotate, further the plurality of disturbance blades (2) continuously disturb mixed gas of the ethanol steam and the natural gas in the mixed gas disturbance pressure accumulation chamber (6), and further the mixed gas disturbance pressure accumulation chamber (6) generates continuous homogeneous ethanol steam natural gas mixed fuel; then the homogeneous ethanol steam natural gas mixed fuel is uniformly led out to the combustion chamber (14) through a plurality of fuel gas leading-out holes (23); the homogeneous ethanol steam natural gas mixed fuel uniformly led out from the plurality of gas leading-out holes (23) and the combustion air led out from the plurality of combustion air leading-out holes (17) are uniformly distributed in the combustion chamber (14) and are mutually fused, and then the combustion chamber (14) generates continuous mixed fuel flame, so that cold water flowing through the heat exchange water pipe (22) is continuously heated; meanwhile, high-temperature flue gas generated by combustion in the combustion chamber (14) is discharged to the lower end of the flue gas heat exchange layer (13) through the smoke discharge channels (4), then the high-temperature flue gas at the lower end of the flue gas heat exchange layer (13) enters the upper end of the flue gas heat exchange layer (13) after flowing through the spiral heat exchange channel (9) at the position of the fuel supply pipe (8), and finally is discharged through the total smoke discharge pipe (28), in the process that the high-temperature flue gas flows through the spiral heat exchange channel (9) at the position of the fuel supply pipe (8), the fuel supply pipe (8) is continuously heated by the high-temperature flue gas, the temperature of the pipe wall of the fuel supply pipe (8) is maintained to be raised to a continuous high-temperature state above 150 ℃, and stable operation of the boiler is further.
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Denomination of invention: Natural gas mixed fuel boiler and method Effective date of registration: 20230330 Granted publication date: 20200619 Pledgee: Shandong Linyi Luozhuang Rural Commercial Bank Co.,Ltd. Pledgor: LINYI OUKE ENERGY SAVING TECHNOLOGY Co.,Ltd. Registration number: Y2023980037108 |
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