Titanium-magnesium-aluminum alloy biomass water heating air heater

Abstract

The utility model belongs to the technical field of heating equipment, and particularly relates to a titanium-magnesium-aluminum alloy biomass water heating air heater which comprises a shell, an air outlet, an air inlet, a feeding port, a smoke outlet, a water outlet and a water inlet are formed in the shell, a feeding mechanism is arranged outside the shell, and an air blower, a surface air cooler, a circulating water cavity and a circulating water pump are arranged in the shell. A combustion chamber and a heat exchange bin are arranged in the circulating water cavity, and heat exchange plates are vertically arranged in the heat exchange bin and divide the heat exchange bin into a plurality of smoke outlet heat exchange chambers and circulating water heat exchange chambers. According to the titanium-magnesium-aluminum alloy biomass water-heating air heater, the U-steel base is arranged, the side wall of the combustion chamber, the bin wall of the heat exchange bin and the heat exchange plate are all made of titanium-magnesium-aluminum alloy, the heat exchange efficiency is improved, heat exchange between heat of smoke and circulating water is sufficient, and the heat exchange efficiency is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heating equipment, and in particular relates to a titanium-magnesium-aluminum alloy biomass water-heating hot air blower. Background Art

[0002] Biomass water heating hot air blower is a hot air furnace that uses biomass energy as fuel. The combustion efficiency of biomass water heating hot air blower is relatively high, the operating cost is low, and it is widely used. The biomass water heating hot air blower mainly includes the feeding system, combustion system, heat exchange system, circulating water pump, surface cooler and blower. The combustion of biomass pellet fuel generates heat, which exchanges heat with the circulating water. After the circulating water is heated, it exchanges heat with the air through the surface cooler. The hot air is pressurized by the blower and sent to the environment that needs to be heated for heating.

[0003] The components of existing biomass hot air furnaces are mainly made of steel plates, iron plates and refractory cement composite structures. The heat exchange structure is mainly steel pipe heat exchange, and the heat exchange efficiency is relatively low. A larger heat exchange area is required, so a longer heat exchange tube is required. The flue gas exchanges heat with the external medium air through the inside of the heat exchange tube. Compared with other liquid media, the heat exchange speed of air is slow and the efficiency is low, which can easily cause the heat exchange tube to burn through, resulting in a high equipment failure rate and a short service life. Utility Model Content

[0004] The purpose of the utility model is to provide a titanium-magnesium-aluminum alloy biomass water-heating hot air blower to solve the technical problems raised in the above-mentioned background technology.

[0005] In order to achieve the above technical purpose, the technical solution of the utility model is:

[0006] A titanium-magnesium-aluminum alloy biomass water-heating hot air blower, comprising a shell, the shell is provided with an air outlet, an air inlet, a feed port, a smoke outlet, a water outlet and a water inlet, the shell is provided with a feeding mechanism connected with the feed port outside, the shell is provided with a blower connected with the air outlet, a surface cooler connected with the air inlet and a circulating water cavity connected with the water inlet and the water outlet inside, the circulating water cavity is connected with a connecting pipeline, one end of the connecting pipeline close to the surface cooler is connected with the surface cooler, and the other end is connected with a circulating water pump, and the circulating water pump is connected with the circulating water cavity;

[0007] A combustion chamber and a heat exchange chamber are provided in the circulating water cavity. The top of the combustion chamber is communicated with the heat exchange chamber. A heat exchange plate is vertically provided in the heat exchange chamber. The heat exchange plate divides the heat exchange chamber into a plurality of smoke outlet heat exchange chambers and a circulating water heat exchange chamber. One end of the smoke outlet heat exchange chamber away from the combustion chamber is communicated with the smoke outlet. The circulating water heat exchange chamber is communicated with the circulating water cavity.

[0008] The shell is provided with a channel steel base, the side wall of the combustion chamber is a titanium-magnesium-aluminum alloy side wall, the warehouse wall of the heat exchange warehouse is a titanium-magnesium-aluminum alloy warehouse wall, and the heat exchange plate is a titanium-magnesium-aluminum alloy heat exchange plate.

[0009] As an improvement, the heat exchange plate includes an upper heat exchange plate and a lower heat exchange plate, the top end of the upper heat exchange plate is connected to the top inner wall of the heat exchange bin, the bottom end of the lower heat exchange plate is connected to the bottom inner wall of the heat exchange bin, two adjacent upper heat exchange plates are fixedly connected by a V-shaped connecting piece, and two adjacent lower heat exchange plates are fixedly connected by a V-shaped connecting piece, a lower smoke outlet channel is formed between the bottom end of the upper heat exchange plate and the bottom inner wall of the heat exchange bin, and an upper smoke outlet channel is formed between the top end of the lower heat exchange plate and the top inner wall of the heat exchange bin.

[0010] As a further improvement, the bottom of the smoke outlet heat exchange chamber is connected to the lower smoke outlet channel, and the top of the smoke outlet heat exchange chamber is connected to the upper smoke outlet channel;

[0011] A plurality of ash cleaning ports are provided in the middle of the side wall of the heat exchange chamber corresponding to the position of the lower smoke outlet channel, the number of the ash cleaning ports is the same as the number of the lower smoke outlet channels, and the ash cleaning ports are provided with detachable sealing covers.

[0012] As a further improvement, a vertically arranged support channel steel is provided between the adjacent upper heat exchange plate and the lower heat exchange plate, a horizontally arranged support plate is provided in the circulating water heat exchange chamber, a circulating water channel is formed between the end of the support plate and the inner wall of the circulating water heat exchange chamber, and the circulating water channel is connected to the circulating water cavity.

[0013] As a further improvement, a combustion-supporting fan is provided at the bottom of the combustion chamber, a furnace plate is provided in the combustion chamber, and a furnace door and a ash cleaning door are provided in the combustion chamber.

[0014] As a further improvement, an ignition hole is provided in the combustion chamber below the feed port, a ceramic heating wire ignition rod is provided in the ignition hole, the ignition hole is connected to a branch air duct, and the branch air duct is connected to the combustion-supporting fan.

[0015] As a further improvement, the smoke outlet is connected to a water dust removal mechanism, which includes an induced draft fan connected to the smoke outlet, the induced draft fan is connected to a smoke outlet pipe, and one end of the smoke outlet pipe away from the induced draft fan extends into the water tank.

[0016] As a further improvement, the feeding mechanism includes a silo and a screw conveyor fixed on one side of the shell, the screw conveyor is arranged at an angle, one end of the screw conveyor is connected to the bottom of the silo, and the other end is connected to the feed port of the furnace body, and the screw conveyor includes a feeding motor.

[0017] As a further improvement, the feeding motor is driven and connected to a spiral shaft, the spiral shaft is fixedly connected to a spiral blade, a spiral shell is provided outside the spiral blade, one end of the spiral shell is provided with a spiral feed port, and the other end is provided with a spiral discharge port, the spiral feed port is connected to the bottom of the silo, and the spiral discharge port is connected to the feed port.

[0018] As a further improvement, the feed port is fixedly connected to a feed pipe, the feed pipe is obliquely inserted into the inner wall of the combustion chamber, and the length of the feed pipe is equal to the thickness of the inner wall of the combustion chamber.

[0019] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0020] The utility model provides a titanium-magnesium-aluminum alloy biomass water-heating hot air blower. Biomass particle fuel is added into the combustion chamber through a feeding mechanism and a feeding pipe. The heat generated by the combustion of the biomass particle fuel is heat-exchanged with the water in the circulating water cavity through the side wall of the combustion chamber. The smoke generated by the combustion flows through the heat exchange chamber and is heat-exchanged with the water in the circulating water channel outside the heat exchange chamber. After the water in the circulating water channel absorbs the heat, the temperature of the smoke is reduced and the smoke is discharged through the smoke outlet channel and the smoke outlet. The water in the circulating water channel and the water in the circulating water cavity are discharged after the temperature is increased. The arrangement of the heat exchange plate increases the heat exchange area and greatly improves the heat exchange efficiency.

[0021] The titanium-magnesium-aluminum alloy biomass water-heating hot air blower provided by the utility model is provided with a channel steel base, and the side walls of the combustion chamber, the walls of the heat exchange bin and the heat exchange plates are all made of titanium-magnesium-aluminum alloy. The titanium-magnesium-aluminum alloy has excellent corrosion resistance, good plasticity and high strength, good mechanical properties, and excellent toughness and corrosion resistance. In particular, it has excellent thermal conductivity, which is beneficial to improving the heat exchange efficiency of the water-heating hot air blower, so that the heat of the flue gas is fully exchanged with the circulating water, thereby greatly improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model;

[0023] Figure 2 yes Figure 1 A magnified image of point A;

[0024] Figure 3 It is a structural schematic diagram of the utility model from another angle;

[0025] Figure 4 It is a schematic diagram of the structure of the heat exchange chamber and the combustion chamber;

[0026] Figure 5 It is a schematic diagram of the connection relationship of the supporting channel steel;

[0027] Figure 6 It is a schematic diagram of the connection relationship of the connecting pipelines;

[0028] Among them: 1-shell, 10-channel steel base, 11-air inlet, 12-air outlet, 13-smoke outlet, 14-water outlet, 15-water inlet, 2-circulating water cavity, 21-connecting pipeline, 3-combustion chamber, 31-furnace plate, 32-furnace door, 33-ash cleaning door, 34-combustion-supporting fan, 4-heat exchange bin, 40-heat exchange plate, 401-upper heat exchange plate 401, 402-lower heat exchange plate 402, 41-smoke heat exchange chamber, 42-circulating water heat exchange chamber, 43-upper smoke outlet channel, 44-lower smoke outlet channel, 45-ash cleaning port, 451-sealing cover, 46-support channel steel, 47-support plate, 48-circulating water channel, 49-V-shaped connector, 5-feeding mechanism, 51-screw conveyor, 52-bin, 6-surface cooler, 7-blower, 8-circulating water pump. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the specific implementation methods and the accompanying drawings. The accompanying drawings are only for illustrative purposes and are only schematic diagrams, not actual drawings, and should not be construed as limiting the present application. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. It is understandable to those skilled in the art that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0030] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on the present application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] like Figure 1-6 As shown, a titanium-magnesium-aluminum alloy biomass water-heating hot air blower includes a shell 1 and an electric control box. The shell 1 is provided with an air outlet 12, an air inlet 11, a feed port, a smoke outlet 13, a water outlet 14 and a water inlet 15. A feeding mechanism 5 connected to the feed port is provided outside the shell 1. A blower 7 connected to the air outlet 12, a surface cooler 6 connected to the air inlet 11 and a circulating water chamber 2 connected to the water inlet 15 and the water outlet 14 are provided inside the shell 1. Specifically, the surface cooler 6 is a prior art and will not be described in detail here.

[0032] The circulating water chamber 2 is connected to a connecting pipe 21, one end of the connecting pipe 21 close to the surface cooler 6 is connected to the surface cooler 6, and the other end is connected to a circulating water pump 8. The circulating water pump 8 is connected to the circulating water chamber 2, so that the water in the circulating water chamber is circulated, thereby improving the heat exchange efficiency of the water-heating hot air blower.

[0033] The feeding mechanism 5 includes a silo 52 fixed on one side of the shell 1 and a screw conveyor 51. The screw conveyor 51 includes a feeding motor. The feeding motor is driven and connected to a screw shaft. The screw shaft is fixedly connected to a spiral blade. A spiral shell is provided outside the spiral blade. A spiral feed port is provided at one end of the spiral shell, and a spiral discharge port is provided at the other end. The spiral feed port is connected to the bottom of the silo 52, and the spiral discharge port is connected to the feed port. The setting of the feeding mechanism 5 allows the feeding speed to be accurately controlled.

[0034] A combustion chamber 3 and a heat exchange chamber 4 are provided in the circulating water chamber 2. The top of the combustion chamber 3 is connected to the heat exchange chamber 4. A heat exchange plate 40 is vertically arranged in the heat exchange chamber 4. The heat exchange plate 40 divides the heat exchange chamber 4 into a plurality of smoke exhaust heat exchange chambers 41 and a circulating water heat exchange chamber 42. The end of the smoke exhaust heat exchange chamber 41 away from the combustion chamber 3 is connected to the smoke outlet 13, and the circulating water heat exchange chamber 42 is connected to the circulating water chamber 2.

[0035] The feed port is fixedly connected with a feed pipe, which is obliquely inserted into the inner wall of the combustion chamber 3 . The length of the feed pipe is equal to the thickness of the inner wall of the combustion chamber 3 , so that the biomass particle fuel can be spread more evenly in the combustion chamber 3 .

[0036] In this embodiment, a water inlet 15 is arranged at the lower back of the shell 1, and a water outlet 14 is arranged at the top of the shell 1. The water outlet 14 is arranged at the top of the shell 1 above the combustion chamber 3. The circulating water outlet temperature is high. The circulating water entering from the bottom is discharged from the water outlet 14 after being heated. A temperature detection sensor and a water level detection sensor are provided in the circulating water chamber 2 to detect the operating status of the boiler and alarm for abnormal status. According to the detected temperature of the circulating water, an air outlet signal is sent to the control box, and the control box controls the operation of the feeding motor, and then controls the feeding speed, so as to control the temperature of the titanium-magnesium-aluminum alloy biomass water heating hot air blower to avoid its temperature being too high, thereby reducing fuel usage and reducing operating costs.

[0037] In the titanium-magnesium-aluminum alloy biomass water-heating hot air blower provided in the present embodiment, biomass particle fuel is added into the combustion chamber 3 through the feeding mechanism 5, and the heat generated by the combustion of the biomass particle fuel is heat exchanged with the water in the circulating water chamber 2 through the side wall of the combustion chamber 3, and the flue gas generated by the combustion flows through the heat exchange chamber 4 and exchanges heat with the water in the circulating water channel 48 outside the heat exchange chamber 4. After the water in the circulating water channel 48 absorbs the heat, the temperature of the flue gas decreases and is discharged through the smoke outlet channel and the smoke outlet 13, and the water in the circulating water channel 48 and the water in the circulating water chamber 2 are discharged after the temperature increases; the arrangement of the heat exchange plate 40 increases the heat exchange area, which greatly improves the heat exchange efficiency.

[0038] The shell 1 is provided with a channel steel base 10 , the side wall of the combustion chamber 3 is a titanium-magnesium-aluminum alloy side wall, the warehouse wall of the heat exchange warehouse 4 is a titanium-magnesium-aluminum alloy warehouse wall, and the heat exchange plate 40 is a titanium-magnesium-aluminum alloy heat exchange plate 40 .

[0039] The titanium-magnesium-aluminum alloy biomass water-heating hot air blower provided in this embodiment has side walls of the combustion chamber 3, walls of the heat exchange bin 4 and heat exchange plates 40 all made of titanium-magnesium-aluminum alloy. The titanium-magnesium-aluminum alloy has excellent corrosion resistance, good plasticity and high strength, good mechanical properties, and excellent toughness and corrosion resistance. In particular, it has good thermal conductivity, which is beneficial to improving the heat exchange efficiency of the water-heating hot air blower, so that the heat of the flue gas is fully exchanged with the circulating water, thereby greatly improving the heat exchange efficiency.

[0040] In this embodiment, the heat exchange plate 40 is vertically arranged, and dust is not easy to accumulate on the surface of the heat exchange plate 40 made of titanium-magnesium-aluminum alloy. Dust will settle to the bottom of the heat exchange chamber, which is convenient for cleaning through the cleaning port 45, and the operation is convenient.

[0041] Furthermore, the heat exchange plate 40 includes an upper heat exchange plate 401 and a lower heat exchange plate 402, the top end of the upper heat exchange plate 401 is connected to the top inner wall of the heat exchange chamber 4, the bottom end of the lower heat exchange plate 402 is connected to the bottom inner wall of the heat exchange chamber 4, the two adjacent upper heat exchange plates 401 are fixedly connected by a V-shaped connector 49, the two adjacent lower heat exchange plates 402 are fixedly connected by a V-shaped connector 49, a lower smoke outlet channel 44 is formed between the bottom end of the upper heat exchange plate 401 and the bottom inner wall of the heat exchange chamber 4, and an upper smoke outlet channel 43 is formed between the top end of the lower heat exchange plate 402 and the top inner wall of the heat exchange chamber 4.

[0042] The bottom of the smoke outlet heat exchange chamber 41 is connected with the lower smoke outlet channel 44, and the top of the smoke outlet heat exchange chamber 41 is connected with the upper smoke outlet channel 43. A plurality of cleaning ports 45 are provided in the middle of the side wall of the heat exchange chamber 4 corresponding to the position of the lower smoke outlet channel 44. The number of the cleaning ports 45 is the same as the number of the lower smoke outlet channels 44. Specifically, the cleaning ports 45 are provided with a removable sealing cover 451, and the sealing cover 451 is sealed with a soft high-temperature resistant material, which can be a ceramic fiber braided rope.

[0043] A vertically arranged support channel steel 46 is provided between the adjacent upper heat exchange plate 401 and the lower heat exchange plate 402, a horizontally arranged support plate 47 is provided in the circulating water heat exchange chamber 42, a circulating water channel 48 is formed between the end of the support plate 47 and the inner wall of the circulating water heat exchange chamber 42, and the circulating water channel 48 is connected to the circulating water cavity 2. The arrangement of the support channel steel 46 and the support plate 47 enhances the heat resistance of the heat exchange plate 40, and avoids the temperature in the heat exchange chamber 4 being too high after long-term use, which affects the strength of the heat exchange plate 40, wherein the support plates 47 in the circulating water heat exchange chamber 42 are arranged in a staggered manner, and do not affect the normal flow of the circulating water.

[0044] A combustion-supporting fan 34 is provided at the bottom of the combustion chamber 3, a furnace plate 31 is provided in the combustion chamber 3, a furnace door 32 and a ash cleaning door 33 are provided in the combustion chamber 3, an ignition hole is provided below the feed port of the combustion chamber 3, a ceramic electric heating wire ignition rod is provided in the ignition hole, the ignition hole is connected to a branch air duct, and the branch air duct is connected to the combustion-supporting fan 34, so that the biomass pellet fuel is fully burned.

[0045] The smoke outlet 13 is connected to a water dust removal mechanism, which includes an induced draft fan connected to the smoke outlet 13, the induced draft fan is connected to a smoke outlet pipe, and the end of the smoke outlet pipe away from the induced draft fan extends into the water tank to clean the exhausted smoke to prevent it from causing environmental pollution.

[0046] The specific implementation methods of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A titanium-magnesium-aluminum alloy biomass water-heating hot air blower, comprising a housing, characterized in that: The shell is provided with an air outlet, an air inlet, a feed port, a smoke outlet, a water outlet and a water inlet, the shell is provided with a feeding mechanism connected with the feed port outside, the shell is provided with a blower connected with the air outlet, a surface cooler connected with the air inlet and a circulating water cavity connected with the water inlet and the water outlet inside, the circulating water cavity is connected with a connecting pipeline, one end of the connecting pipeline close to the surface cooler is connected with the surface cooler, and the other end is connected with a circulating water pump, and the circulating water pump is connected with the circulating water cavity; A combustion chamber and a heat exchange chamber are provided in the circulating water cavity. The top of the combustion chamber is communicated with the heat exchange chamber. A heat exchange plate is vertically provided in the heat exchange chamber. The heat exchange plate divides the heat exchange chamber into a plurality of smoke outlet heat exchange chambers and a circulating water heat exchange chamber. One end of the smoke outlet heat exchange chamber away from the combustion chamber is communicated with the smoke outlet. The circulating water heat exchange chamber is communicated with the circulating water cavity. The shell is provided with a channel steel base, the side wall of the combustion chamber is a titanium-magnesium-aluminum alloy side wall, the warehouse wall of the heat exchange warehouse is a titanium-magnesium-aluminum alloy warehouse wall, and the heat exchange plate is a titanium-magnesium-aluminum alloy heat exchange plate.

2. The titanium-magnesium-aluminum alloy biomass water-heating hot air blower according to claim 1, characterized in that: The heat exchange plate comprises an upper heat exchange plate and a lower heat exchange plate, the top end of the upper heat exchange plate is connected to the top inner wall of the heat exchange bin, the bottom end of the lower heat exchange plate is connected to the bottom inner wall of the heat exchange bin, two adjacent upper heat exchange plates are fixedly connected by a V-shaped connector, and two adjacent lower heat exchange plates are fixedly connected by a V-shaped connector, a lower smoke outlet channel is formed between the bottom end of the upper heat exchange plate and the bottom inner wall of the heat exchange bin, and an upper smoke outlet channel is formed between the top end of the lower heat exchange plate and the top inner wall of the heat exchange bin.

3. The titanium-magnesium-aluminum alloy biomass water-heating hot air blower according to claim 2, characterized in that: The bottom of the smoke outlet heat exchange chamber is connected to the lower smoke outlet channel, and the top of the smoke outlet heat exchange chamber is connected to the upper smoke outlet channel; A plurality of ash cleaning ports are provided in the middle of the side wall of the heat exchange chamber corresponding to the position of the lower smoke outlet channel, the number of the ash cleaning ports is the same as the number of the lower smoke outlet channels, and the ash cleaning ports are provided with detachable sealing covers.

4. The titanium-magnesium-aluminum alloy biomass water-heating hot air blower according to claim 2, characterized in that: A vertically arranged support channel steel is provided between the adjacent upper heat exchange plate and the lower heat exchange plate, a horizontally arranged support plate is provided in the circulating water heat exchange chamber, a circulating water channel is formed between the end of the support plate and the inner wall of the circulating water heat exchange chamber, and the circulating water channel is connected to the circulating water cavity.

5. The titanium-magnesium-aluminum alloy biomass water-heating hot air blower according to claim 1, characterized in that: A combustion-supporting fan is arranged at the bottom of the combustion chamber, a furnace plate is arranged in the combustion chamber, and a furnace door and a ash cleaning door are arranged in the combustion chamber.

6. The titanium-magnesium-aluminum alloy biomass water-heating hot air blower according to claim 5, characterized in that: An ignition hole is provided in the combustion chamber below the feed port, a ceramic electric heating wire ignition rod is provided in the ignition hole, the ignition hole is connected to a branch air duct, and the branch air duct is connected to the combustion-supporting fan.

7. A titanium-magnesium-aluminum alloy biomass water-heating hot air blower according to any one of claims 1-6, characterized in that: The smoke outlet is connected to a water dust removal mechanism, which includes an induced draft fan connected to the smoke outlet, the induced draft fan is connected to a smoke outlet pipe, and one end of the smoke outlet pipe away from the induced draft fan extends into the water tank.

8. The titanium-magnesium-aluminum alloy biomass water-heating hot air blower according to claim 1, characterized in that: The feeding mechanism includes a silo and a screw conveyor fixed on one side of the shell. The screw conveyor is arranged obliquely. One end of the screw conveyor is connected to the bottom of the silo, and the other end is connected to the feed port. The screw conveyor includes a feeding motor.

9. The titanium-magnesium-aluminum alloy biomass water-heating hot air blower according to claim 8, characterized in that: The feeding motor is driven and connected to a spiral shaft, and the spiral shaft is fixedly connected to a spiral blade. A spiral shell is arranged outside the spiral blade. A spiral feed port is arranged at one end of the spiral shell, and a spiral discharge port is arranged at the other end. The spiral feed port is communicated with the bottom of the silo, and the spiral discharge port is communicated with the feed port.

10. A titanium-magnesium-aluminum alloy biomass water-heating hot air blower according to claim 8 or 9, characterized in that: The feed port is fixedly connected with a feed pipe, and the feed pipe is obliquely inserted into the inner wall of the combustion chamber, and the length of the feed pipe is equal to the thickness of the inner wall of the combustion chamber.

Images