CN111720732B

CN111720732B - Full-automatic fuel heating integral gasifier

Info

Publication number: CN111720732B
Application number: CN202010467716.8A
Authority: CN
Inventors: 王艇; 帕特里克
Original assignee: Kelaipu Zhejiang Gas Equipment Co ltd
Current assignee: Kelaipu Zhejiang Gas Equipment Co ltd
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2022-05-13
Anticipated expiration: 2040-05-28
Also published as: CN111720732A

Abstract

The invention relates to the technical field of liquefied natural gas gasification systems, in particular to a full-automatic natural gas/fuel heating integral gasifier, which comprises a combustion area and a heat exchange area, wherein the combustion area comprises a burner and a burner control system, the heat exchange area comprises a water bath storage tank, a chimney and a circulating water pump, a heat exchange tube bundle, a flue gas heat exchange tube and an overflow tube are arranged in the water bath storage tank, a ventilation system and an alarm system are also arranged in the combustion area, the burner is a combined premix burner, a conical spiral premix tube is arranged in the premix burner, a flow director is arranged on the premix burner, and an energy saver is arranged at the joint of the flue gas heat exchange tube and the chimney. The invention also has the advantages of compact structure and high flexibility.

Description

Full-automatic fuel heating integral gasifier

Technical Field

The invention relates to the technical field of liquefied natural gas gasification systems, in particular to a full-automatic fuel heating integral gasifier.

Background

The natural gas is a clean and environment-friendly high-quality energy source, almost does not contain sulfur, dust and other harmful substances, and generates carbon dioxide less than other fossil fuels when being combusted, so that the greenhouse effect is low, and the environmental quality can be fundamentally improved. Along with the rise of social environmental awareness and transformation and upgrading of economic structures in China, the optimization of energy supply structures in China is in progress, and the consumption of natural gas keeps increasing at a high speed for a long time.

LNG is an abbreviation for liquefied natural gas (liquefied natural gas). LNG is natural gas that becomes liquid after being compressed and cooled to its boiling point (-161.5 c). The LNG is colorless, tasteless, nontoxic and noncorrosive, the volume of the LNG is about 1/625 of the volume of the same amount of gaseous natural gas, the weight of the LNG is only about 45% of the same volume of water, and by utilizing the characteristics of the LNG, the LNG is usually stored in a low-temperature storage tank, transported by a special ship or a tank truck and regasified when in use. At present, LNG becomes a main gas source or a transition gas source of a city which can not use the pipeline natural gas for gas supply, and is also a supplementary gas source or a peak shaving gas source of a plurality of cities which use the pipeline natural gas for gas supply. An LNG vaporization station is a satellite station that receives, stores, and distributes LNG, and is also an intermediate conditioning site for towns or gas companies to transfer LNG from a manufacturer to a customer. By virtue of the advantages of short construction period and capability of rapidly meeting the demand of a gas utilization market, the LNG gasification station is gradually built in a plurality of economically developed and energy-scarce middle and small cities in the south-east coast of China, and becomes a permanent gas supply facility or a transitional gas supply facility before arrival of pipeline natural gas.

The existing LNG gasification device occupies a large area, so that the large-scale development and application of the existing LNG gasification device are restricted, the heating type LNG gasification device is low in heat efficiency, the heat efficiency is mainly influenced by the emission temperature of flue gas, and the reduction of the exhaust gas temperature is one of the problems to be solved in the prior art.

Chinese patent CN201510609508.6 discloses a patent with the name of energy-saving submerged combustion gasifier, which has the technical key points that: an energy-saving submerged combustion gasifier comprises a blower, an air duct, a burner, a combustion chamber, a flue gas distributor, a water tank, a heat exchange tube bundle, a weir flow box, an alkali liquor tank, a chimney, a gas-liquid separator and a smoke window regulating valve; the smoke distributor comprises a collecting pipe and bubbling pipes, one end of each bubbling pipe is communicated with the collecting pipe, the bubbling pipes are positioned below the heat exchange pipe bundle, and the top of each bubbling pipe is provided with at least one row of injection holes; the weir flow box is supported by a bracket fixed at the bottom of the water tank, and the heat exchange tube bundle is suspended and supported by a suspension support structure at the top of the weir flow box and is immersed in the water bath liquid in the water tank; a gas-liquid separator is arranged in the chimney; a bypass is arranged at the lower part of the chimney and is respectively connected with the combustor and the flue gas distributor through a first branch and a second branch; it has solved area big and the not high problem of thermal efficiency, though have in this patent to be provided with the lye tank and be used for neutralizing the water bath liquid, but its maintenance cost has been higher, needs the fan of great horsepower to spout flame into aquatic in addition, has improved the electric power cost of equipment operation.

Disclosure of Invention

The invention provides a full-automatic fuel heating integral gasifier aiming at the problems of large occupied area, high maintenance cost and electric power cost but low thermal efficiency.

In order to solve the technical problem, the invention is solved by the following technical scheme:

the full-automatic fuel heating integral gasifier comprises a combustion area and a heat exchange area, wherein the combustion area comprises a combustor and a combustor control system, the heat exchange area comprises a water bath storage tank, a chimney and a circulating water pump, the circulating water pump is arranged on the side of the water bath storage tank, a heat exchange tube bundle, a flue gas heat exchange tube and an overflow tube are arranged in the water bath storage tank, and hot water in the water bath storage tank and the heat exchange tube bundle can effectively exchange heat in a natural convection mode through the circulating water pump in the operation process of equipment; the combustion area is communicated with the heat exchange area through a flue gas heat exchange tube, one end of the water bath storage tank is provided with a through hole, one end of the flue gas heat exchange tube penetrates out of the through hole and is connected with a burner arranged outside the water bath storage tank, the other end of the flue gas heat exchange tube is connected with a chimney arranged at the top of the water bath storage tank, flue gas generated by the burner of the device is discharged after exchanging heat with water in the water bath storage tank through a flue gas heat exchange pipeline, and is not in direct contact with the water, so that high-concentration chemical wastewater cannot be generated, and the maintenance cost is reduced; the burner control system is embedded in a control cabinet at the end part of the water bath storage tank and is provided with an inlet hole door; an LNG liquid inlet, a natural gas outlet, a water inlet and an overflow water outlet are arranged outside the water bath storage tank; one end of the heat exchange tube bundle is connected with the LNG liquid inlet, and the other end of the heat exchange tube bundle is connected with the natural gas outlet; one end of the overflow pipe is connected with the overflow water outlet, and the other end of the overflow pipe is arranged in the water bath storage tank.

Preferably, a ventilation system and an alarm system are further arranged in the combustion area, the ventilation system comprises a ventilation window and a ventilation opening, the ventilation system can ensure good ventilation of the combustion chamber and can also reduce the influence of external environmental factors on main components such as a combustor and the like; the alarm system comprises an automatic combustion safety warning device and a gas sensor, wherein an expansion alarm for the state and fault occurrence of the burner is arranged in the automatic combustion safety warning device, and when the burner system is closed, the control panel can display the fault position and give out a sound alarm; the automatic safety protection system for the flame of the burner can meet the requirement of frequent on-site starting or suspension operation.

Preferably, the burner is a combined premixing burner, the nitrogen oxide emission of the selected premixing burner is lower than that of a standard burner, a flue gas recirculation system does not need to be additionally arranged on the equipment, the premixing burner comprises a premixing chamber, an igniter and an ignition ring, a premixing pipe is arranged in the premixing chamber, the igniter is arranged at one end, close to the ignition ring, of the premixing chamber, a fluid director is arranged on the surface of the ignition ring, the device can provide 100% of single burner systems, 100% of two burner systems or 50% of two burner systems, and the gasification flow can be automatically adjusted according to the actual operation condition of a project.

Preferably, the premixing pipe is arranged in a conical spiral shape, the bottom of the premixing pipe is provided with the mixing ring, a first air inlet pipe and a second air inlet pipe are arranged on two sides of the mixing ring, the premixing pipe is fixed inside the premixing chamber through the first air inlet pipe and the second air inlet pipe, and the first air inlet pipe and the second air inlet pipe are fixed at one end, far away from the ignition ring, of the premixing chamber.

Preferably, the fluid director is in a semicircular shape, the top end of the fluid director is provided with a through hole, the side surface of the fluid director is provided with an auxiliary fire hole, the through hole at the top end of the fluid director and the air outlet hole on the ignition ring are in a coaxial line structure, in order to enable fuel to be combusted more fully, most of combustible gas discharged from the air outlet hole can be discharged from the through hole at the top end of the fluid director, and the combustible gas discharged from the through hole can not circulate in the ignition ring but can be discharged from the auxiliary fire hole and ignited, so that the combustion efficiency is improved, and the water temperature is accelerated to be increased.

Preferably, an energy saver is arranged at the joint of the flue gas heat exchange tube and the chimney, a circulating water tank and an air inlet cylinder are arranged in the energy saver, a circulating water pipe is arranged on the side surface of the energy saver, the section of the circulating water pipe is rectangular, and one end of the circulating water pipe is inserted into the energy saver and connected with the bottom of the circulating water tank, so that the energy saver can play a role in water circulation and can play a certain supporting role to prevent the water tank from falling down; the other end of the circulating water pipe is connected with a circulating water pump; the circulating water tank is connected with the inner wall of the energy saver through a fixing block arranged in the energy saver, the fixing block is arranged on the upper part of the outer surface of the circulating water tank and is not arranged on the same surface as the circulating water pipe, so that the supporting force for supporting the water tank is uniformly distributed, and the situation of part strain caused by nonuniform force distribution after long-term use is prevented; the air inlet cylinder is arranged below the circulating water tank, the bottom of the circulating water tank is suspended and does not contact with any part, the circulating water tank is prevented from being damaged due to long-term high temperature, one end of the air inlet cylinder is fixedly connected with the bottom of the energy saver, the outer side of the lower surface of the energy saver is fixedly connected with the air inlet cylinder and the flue gas heat exchange tube, the top of the energy saver is provided with the air outlet cylinder, the air outlet cylinder is arranged on the outer side of the energy saver, and the energy saver can guarantee that the temperature of flue gas discharged from a chimney is controlled to be about 65-100 ℃.

As preferred, the air inlet cylinder sets up to the circular cone structure, and the diameter that the air inlet cylinder is close to circulating water tank one end is greater than the diameter of keeping away from circulating water tank one end, and circular cone structural design makes the area of contact of exhaust flue gas and circulating water tank bottom bigger to improve heat exchange efficiency.

As preferred, go out the gas cylinder and form by a plurality of arcs piece combinations, the bottom of arc piece and the top fixed connection of energy-saving appliance, arc piece top arc length is less than arc piece bottom arc length, goes out the diameter at gas cylinder top and can change along with the flue gas exhaust power size in the flue gas heat exchange tube: when the power for discharging the flue gas is the maximum, the diameter of the top of the gas outlet cylinder is increased to be as large as the diameter of the bottom of the gas outlet cylinder, and the gas outlet cylinder is of a cylindrical structure; when flue gas exhaust power is minimum, the diameter at gas outlet cylinder top is less than gas outlet cylinder bottom diameter, for the circular truncated cone structure, this kind of structural design can slow down flue gas exhaust speed when the flue gas is not enough for the temperature of flue gas can fully be absorbed by the water in the circulating water tank.

As preferred, heat exchange tube bank sets up to detachable construction, and heat exchange tube bank is made by stainless steel U type tubular construction, and this structure has improved gasification efficiency, has low stress, low temperature resistant characteristic, has prolonged the working life of equipment.

Preferably, the flue gas heat exchange pipe is arranged to be of a structure combining an L-shaped pipe and a U-shaped pipe, the overflow pipe is arranged to be a double U-shaped pipe, the structure is efficient, the heat transfer efficiency of the fire pipe can reach more than 90%, the fuel cost can be reduced, compared with the SCV (small scale vehicle) device, a fan with larger horsepower is needed to spray flame into water (the horsepower of the fan needed by the SCV is more than 5 times higher than that of the device), and therefore the electric power cost for operating the device is increased.

Due to the adoption of the technical scheme, the invention has the remarkable technical effects that:

the invention can be assembled into a skid-mounted gasifier without external pipelines and heaters, does not need additional equipment and pipeline connection, can meet the requirement that a gasifier with larger flow is required due to limited occupied area of a customer site by a compact design, can be moved or made into a movable gasification system when necessary, and is more flexible and mobile; the heat exchange tube bank sets up the detachable construction of making into by stainless steel U type tubular construction, gasification efficiency has been improved, low stress, low temperature resistant characteristic has been had, the working life of equipment has been prolonged, the flue gas that this device's combustor produced is discharged after passing through the water heat transfer in flue gas heat exchange pipeline and the water bath storage tank, not with water direct contact, therefore can not produce the chemical waste water of high concentration, the maintenance cost is reduced, pollution is reduced, special energy-saving appliance and premixing chamber structure have improved heat exchange efficiency and combustion efficiency.

Drawings

Fig. 1 is a schematic plan view of the structure of embodiment 1 of the present invention.

Fig. 2 is a schematic view of embodiment 1 of the present invention.

FIG. 3 is a schematic view of the construction of a premix burner in example 1 of the present invention.

FIG. 4 is a schematic view showing the structure of a premix tube in example 1 of the present invention.

FIG. 5 is a schematic cross-sectional view of the fixed connection between the deflector and the ignition ring in example 1 of the present invention.

Fig. 6 is a schematic structural view of a fluid director in embodiment 1 of the present invention.

Fig. 7 is a schematic structural view of an economizer in embodiment 1 of the present invention.

Fig. 8 is a top view of fig. 7.

Fig. 9 is a schematic cross-sectional view of C-C in fig. 8.

Fig. 10 is a schematic view of the internal structure of an economizer in embodiment 1 of the present invention.

The names of the parts indicated by the numerical references in the drawings are as follows: wherein, 1-combustion area, 11-combustor, 111-premixing chamber, 112-igniter, 113-ignition ring, 1131-air outlet, 114-premixing tube, 115-deflector, 1151-through hole, 1152-auxiliary fire hole, 116-mixing ring, 117-first air inlet tube, 118-second air inlet tube, 12-combustor control system, 13-ventilation system, 131-ventilation window, 132-ventilation opening, 14-alarm system, 141-automatic combustion safety warning device, 2-heat exchange area, 21-water bath storage tank, 211-heat exchange tube bundle, 212-flue gas heat exchange tube, 213-overflow tube, 214-LNG liquid inlet, 215-natural gas outlet, 216-water inlet, 217-overflow water outlet, 218-control cabinet, 22-chimney, 23-circulating water pump, 24-energy saver, 241-circulating water tank, 242-air inlet cylinder, 243-circulating water pipe, 244-fixed block and 245-air outlet cylinder.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

As shown in fig. 1 to 10, the full-automatic fuel heating integral gasifier comprises a combustion area 1 and a heat exchange area 2, wherein the combustion area 1 comprises a combustor 11 and a combustor control system 12, the heat exchange area 2 comprises a water bath storage tank 21, a chimney 22 and a circulating water pump 23, the circulating water pump 23 is installed on the side of the water bath storage tank 21, a heat exchange tube bundle 211, a flue gas heat exchange tube 212 and an overflow tube 213 are arranged inside the water bath storage tank 21, the heat exchange tube bundle 211 is of a detachable structure, and the heat exchange tube bundle 211 is made of a stainless steel U-shaped tube structure, so that the gasification efficiency is improved, the structure has the characteristics of low stress and low temperature resistance, and the service life of equipment is prolonged; the volume of the water bath storage tank 21 is large enough to ensure that when the combustion system cannot normally operate due to insufficient fuel or blocked electric power, the buffer gasification operation time of the water bath storage tank 21 can reach 30 minutes or longer to ensure that the rear-end process gas can still be continuously gasified, so that the heat exchange tube bundle 211 can be operated under the condition of low thermal stress, the service life of the gasification system is prolonged, the overflow tube 213 is of a double-U-shaped tube structure, and the flue gas heat exchange tube 212 is of a structure combining an L-shaped tube and a U-shaped tube, so that the heat transfer efficiency of the fire tube is improved by the design, the heat transfer efficiency can reach more than 90 percent generally, the fuel cost is reduced, compared with the conventional SCV, a fan with higher horsepower is required to spray flame into water (the horsepower required by the SCV is more than 5 times higher than that of the conventional SCV), and the electric power cost for equipment operation is improved.

Wherein, a through-hole is arranged at one end of the combustion area 1 communicated with the water bath storage tank 21 through the flue gas heat exchange tube 212 and the heat exchange area 2, one end of the flue gas heat exchange tube 212 penetrates out of the through-hole and is connected with the combustor 11 arranged outside the water bath storage tank 21, and the other end is connected with a chimney 22 arranged at the top of the water bath storage tank 21; burner control system 12 is embedded in a control cabinet 218 at the end of bath tank 21. burner control system 12 operates in two modes, first: the control of the system is controlled through PLC programming; secondly, the method comprises the following steps: controlled by a control panel of the burner control system 12; an LNG liquid inlet 214, a natural gas outlet 215, a water inlet 216 and an overflow water outlet 217 are arranged outside the water bath storage tank 21; one end of the heat exchange tube bundle 211 is connected with the LNG liquid inlet 214, and the other end is connected with the natural gas outlet 215; one end of the overflow pipe 213 is connected to the overflow outlet 217, and the other end is disposed inside the water bath tank 21.

The combustion area 1 of the embodiment is further provided with a ventilation system 13 and an alarm system 14, the ventilation system 13 comprises a ventilation window 131 and a ventilation opening 132, the alarm system 14 comprises an automatic combustion safety warning device 141 and a gas sensor, and an extension alarm for the state and fault occurrence of the combustor 11 is arranged in the automatic combustion safety warning device 141.

Further, the burner 11 is configured as a combined premix burner 11, the premix burner 11 includes a premix chamber 111, an igniter 112 and a fire ring 113, a premix pipe 114 is disposed in the premix chamber 111, the igniter 112 is disposed at one end of the premix chamber 111 close to the fire ring 113, and a flow guide 115 is disposed on a surface of the fire ring 113.

In order to better mix the fuel and the combustion-supporting gas, in the embodiment, the premixing tube 114 is arranged in a conical spiral shape, the bottom of the premixing tube 114 is provided with a mixing ring 116, two sides of the mixing ring 116 are provided with a first air inlet pipe 117 and a second air inlet pipe 118, the premixing tube 114 is fixed inside the premixing chamber 111 through the first air inlet pipe 117 and the second air inlet pipe 118, and the first air inlet pipe 117 and the second air inlet pipe 118 are fixed at one end of the premixing chamber 111 far away from the ignition ring 113.

The fluid director 115 in this embodiment is configured as a semicircular ring, the top end of the fluid director 115 is provided with a through hole 1151, the side surface of the fluid director 115 is provided with an auxiliary fire hole 1152, and the through hole 1151 at the top end of the fluid director 115 and the air outlet 1131 on the firing ring 113 are configured as a coaxial line structure.

Based on the purposes of energy conservation and thermal efficiency improvement, the energy saver 24 is arranged at the joint of the flue gas heat exchange tube 212 and the chimney 22, the energy saver 24 can ensure that the temperature of flue gas discharged from the chimney 22 is controlled to be about 65-100 ℃, the energy saver 24 is arranged at the joint of the flue gas heat exchange tube 212 and the chimney 22, a circulating water tank 241 and an air inlet cylinder 242 are arranged in the energy saver 24, a circulating water pipe 243 is arranged on the side surface of the energy saver 24, the cross section of the circulating water pipe 243 is rectangular, one end of the circulating water pipe 243 is inserted into the energy saver 24 and connected with the bottom of the circulating water tank 241, so that the water circulating function can be realized, a certain supporting function can be realized, the circulating water tank 241 is prevented from falling, and the other end of the circulating water pipe 243 is connected with the circulating water pump 23; the circulating water tank 241 is connected with the inner wall of the economizer 24 through a fixing block 244 arranged inside the economizer 24, the fixing block 244 is arranged at the upper part of the outer surface of the circulating water tank 241 and is not arranged on the same surface as the circulating water pipe 243, the bottom of the circulating water tank 241 is suspended and is not contacted with any part, so that the supporting force for supporting the circulating water tank 241 is uniformly distributed, and the condition of part strain caused by nonuniform distribution of force after long-term use is prevented; the air inlet cylinder 242 is arranged below the circulating water tank 241, one end of the air inlet cylinder 242 is fixedly connected with the bottom of the economizer 24, the outer side of the lower surface of the economizer 24 is fixedly connected with the flue gas heat exchange tube 212 at the position of the air inlet cylinder 242, an air outlet cylinder 245 is arranged at the top of the economizer 24, the air outlet cylinder 245 is arranged at the outer side of the economizer 24, and the economizer 24 can control the temperature of the discharged flue gas by changing the volume of the circulating water tank 241.

The gasification system stated in this embodiment is an individual "internal heating formula vaporizer" system, gasification system uses after fixed at the scene usually, send into combustor 11 with the fuel during use and burn, the heat that produces after the fuel burning passes through flue gas heat exchange tube 212 and adds the water of hot-water bath storage tank 21, steam is arranged to the atmosphere after the heat exchange cooling, the water in the water bath storage tank 21 circulates through circulating water pump 23, carry out the convection current with the heat exchanger tube bank 211 in the water bath storage tank 21, thereby improve heat exchange efficiency, heat exchanger tube bank 211 gasifies the low temperature liquid in the tube bank through the heat-conduction of water, thereby accomplish whole gasification process.

The gasification system of the present embodiment can be assembled into a skid-mounted gasifier without external piping and heaters, without additional equipment and piping connections, a compact design can meet the requirements of a gasifier with a large flow capacity and a limited floor space on the customer site, and can be removed or made into a mobile gasification system when necessary, and the outside of the water bath storage tank 21 is provided with an insulating layer. The device can be integrally insulated before leaving the factory, and can be used after being connected on site.

Example 2

This embodiment is different from embodiment 1 in that: the air outlet cylinder 245 is formed by combining a plurality of arc-shaped pieces, the bottoms of the arc-shaped pieces are fixedly connected with the top of the energy saver 24, the arc length of the top of each arc-shaped piece is smaller than that of the bottom of each arc-shaped piece, and the diameter of the top of the air outlet cylinder 245 can change along with the power of the flue gas discharged from the flue gas heat exchange tube 212: when the power for discharging the flue gas is the maximum, the diameter of the top of the gas outlet cylinder 245 is increased to be as large as the diameter of the bottom of the gas outlet cylinder 245, and the gas outlet cylinder is of a cylindrical structure; when the power of the flue gas exhaust is the minimum, the diameter of the top of the gas outlet cylinder 245 is smaller than the diameter of the bottom of the gas outlet cylinder 245, the gas outlet cylinder is of a cone frustum structure, the structural design can slow down the speed of the flue gas exhaust when the flue gas is insufficient, so that the temperature of the flue gas can be fully absorbed by the water in the circulating water tank 241, and the heat exchange efficiency is improved.

Example 3

This embodiment is different from embodiment 1 in that: the air inlet cylinder 242 is set to be in a cone frustum structure, the diameter of one end, close to the circulating water tank 241, of the air inlet cylinder 242 is larger than that of one end, fixedly connected with the energy saver 24, of the air inlet cylinder 242, and the contact area between the exhausted flue gas and the bottom of the circulating water tank 241 is larger due to the cone frustum structural design, so that the heat exchange efficiency is improved.

In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.

Claims

1. Full-automatic fuel heating integral vaporizer, including combustion area (1) and heat transfer district (2), its characterized in that: the combustion zone (1) comprises a combustor (11) and a combustor control system (12), and the combustor control system (12) is controlled by a PLC programming control system; the heat exchange area (2) comprises a water bath storage tank (21), a chimney (22) and a circulating water pump (23), the circulating water pump (23) is installed on the side of the water bath storage tank (21), and a heat exchange tube bundle (211), a flue gas heat exchange tube (212) and an overflow tube (213) are arranged in the water bath storage tank (21); the combustion area (1) is communicated with the heat exchange area (2) through a flue gas heat exchange tube (212), one end of the water bath storage tank (21) is provided with a through hole, one end of the flue gas heat exchange tube (212) penetrates out of the through hole and is connected with a burner (11) arranged outside the water bath storage tank (21), and the other end of the flue gas heat exchange tube is connected with a chimney (22) arranged at the top of the water bath storage tank (21); the burner control system (12) is embedded in a control cabinet (218) at the end part of the water bath storage tank (21); an LNG liquid inlet (214), a natural gas outlet (215), a water inlet (216) and an overflow water outlet (217) are arranged outside the water bath storage tank (21); one end of the heat exchange tube bundle (211) is connected with the LNG liquid inlet (214), and the other end of the heat exchange tube bundle is connected with the natural gas outlet (215); one end of the overflow pipe (213) is connected with the overflow water outlet (217), and the other end is arranged in the water bath storage tank (21); an energy saver (24) is arranged at the joint of the flue gas heat exchange tube (212) and the chimney (22), a circulating water tank (241) and an air inlet cylinder (242) are arranged in the energy saver (24), a circulating water pipe (243) is arranged on the side surface of the energy saver (24), the cross section of the circulating water pipe (243) is rectangular, one end of the circulating water pipe (243) is inserted into the energy saver (24) and connected with the bottom of the circulating water tank (241), and the other end of the circulating water pipe (243) is connected with a circulating water pump (23); the circulating water tank (241) is connected with the inner wall of the energy saver (24) through a fixing block (244) arranged in the energy saver (24), the fixing block (244) is arranged at the upper part of the outer surface of the circulating water tank (241) and is not arranged on the same surface as the circulating water pipe (243), the bottom of the circulating water tank (241) is suspended and is not contacted with any part, an air inlet cylinder (242) is arranged below the circulating water tank (241), one end of the air inlet cylinder (242) is fixedly connected with the bottom of the energy saver (24), the outer side of the lower surface of the energy saver (24) is fixedly connected with the flue gas heat exchange pipe (212) opposite to the air inlet cylinder (242), an air outlet cylinder (245) is arranged at the top of the energy saver (24), and the air outlet cylinder (245) is arranged at the outer side of the energy saver (24); the air inlet cylinder (242) is of a cone frustum structure, and the diameter of one end, close to the circulating water tank (241), of the air inlet cylinder (242) is larger than that of one end, fixedly connected with the energy saver (24), of the air inlet cylinder (242).

2. The fully automated fuel-heated integrated gasifier of claim 1, wherein: the combustion area (1) is also internally provided with a ventilation system (13) and an alarm system (14), the ventilation system (13) comprises a ventilation window (131) and a ventilation opening (132), the alarm system (14) comprises an automatic combustion safety warning device (141) and a gas sensor, and the automatic combustion safety warning device (141) is internally provided with an expansion alarm for the state and fault occurrence of a combustor (11).

3. The fully automated fuel-heated integrated gasifier of claim 1, wherein: the burner (11) is set to be a combined type premixing burner (11), the premixing burner (11) comprises a premixing chamber (111), an igniter (112) and a firing ring (113), a premixing pipe (114) is arranged in the premixing chamber (111), the igniter (112) is arranged at one end, close to the firing ring (113), of the premixing chamber (111), and a fluid director (115) is arranged on the surface of the firing ring (113).

4. The fully automated fuel-heated integrated gasifier of claim 3, wherein: the premixing pipe (114) is arranged to be in a conical spiral shape, a mixing ring (116) is arranged at the bottom of the premixing pipe (114), a first air inlet pipe (117) and a second air inlet pipe (118) are arranged on two sides of the mixing ring (116), the premixing pipe (114) is fixed inside the premixing chamber (111) through the first air inlet pipe (117) and the second air inlet pipe (118), and the first air inlet pipe (117) and the second air inlet pipe (118) are fixed at one end, far away from the ignition ring (113), of the premixing chamber (111).

5. The fully automated fuel-heated integrated gasifier of claim 3, wherein: the fluid director (115) is arranged to be semicircular, a through hole (1151) is formed in the top end of the fluid director (115), an auxiliary fire hole (1152) is formed in the side face of the fluid director (115), and the through hole (1151) in the top end of the fluid director (115) and an air outlet hole (1131) in the fire ring (113) are arranged to be of a coaxial line structure.

6. The fully automated fuel-heated integrated gasifier of claim 1, wherein: the gas outlet cylinder (245) is formed by combining a plurality of arc-shaped pieces, the bottoms of the arc-shaped pieces are fixedly connected with the top of the energy saver (24), the arc length of the top of each arc-shaped piece is smaller than that of the bottom of each arc-shaped piece, and the diameter of the top of the gas outlet cylinder (245) can be changed along with the power of the flue gas discharged from the flue gas heat exchange tube (212): when the power for discharging the flue gas is the maximum, the diameter of the top of the gas outlet cylinder (245) is increased to be as large as the diameter of the bottom of the gas outlet cylinder (245), and the gas outlet cylinder is of a cylindrical structure; when the power for discharging the flue gas is minimum, the diameter of the top of the gas outlet cylinder (245) is smaller than that of the bottom of the gas outlet cylinder (245), and the gas outlet cylinder is of a cone frustum structure.

7. The fully automated fuel-heated integrated gasifier of claim 1, wherein: the heat exchange tube bundle (211) is arranged to be a detachable structure, and the heat exchange tube bundle (211) is made of a stainless steel U-shaped tube structure.

8. The fully automated fuel-heated integrated gasifier of claim 1, wherein: the flue gas heat exchange tube (212) is of a structure combining an L-shaped tube and a U-shaped tube, and the overflow tube (213) is of a double U-shaped tube structure.