Submerged combustion gasifier
By setting up a containment space within the cofferdam frame and adjusting the layout of the main flue gas pipe and branch pipes, the problem of low heat utilization caused by the isolation of the main flue gas distribution pipe was solved, achieving more efficient heat utilization and a stable gasification process.
Patent Information
- Application Number
- CN202423035078.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2034-12-09
AI Technical Summary
In existing submerged combustion gasifiers, the main flue gas distribution pipe is isolated in a water bath outside the cofferdam, which prevents heat from quickly entering the cofferdam, resulting in low energy utilization, low heat transfer coefficient, and high exhaust heat loss.
An accommodating space is set up within the cofferdam frame, and at least part of the flue gas main is located inside the cofferdam frame. The flue gas branch pipes are located below the heat exchange tube bundle. The flue gas main brings in heat within the cofferdam frame, and the flue gas branch pipes and the heat exchange tube bundle form a high-efficiency heat exchange.
It improves energy utilization, reduces flue gas heat loss, enhances heat transfer coefficient and gasification process stability, and achieves more efficient heat utilization.
Smart Images
Figure CN223826272U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of liquefied natural gas gasification, in particular to an immersed combustion gasifier. BACKGROUND
[0002] The immersed combustion gasification device is a key link in the process of the LNG receiving station in the liquefied natural gas (LNG) industrial system. The heat generated by burning fuel gas is released in the water bath through the flue gas distribution pipe, and is transmitted to the low-temperature LNG through the heat exchanger, and the LNG is heated to the target temperature and then output through the gas supply pipe network. The LNG heat exchange coil is immersed in the water bath, which is an immersed combustion gasifier.
[0003] The existing heat exchanger system usually has the following design: the cofferdam surrounds the heat exchange coil, and is integrally installed in the water bath. The cofferdam is higher than the water bath liquid level, and the uppermost row of pipes of the heat exchange coil is also higher than the water bath height. The bottom flue gas distribution pipe manifold is located on one side outside the cofferdam, and a plurality of branch pipes are connected below the heat exchange coil and are uniformly arranged with smoke exhaust holes. The cofferdam gathers flue gas in the heat exchange coil area, and the liquid level in the cofferdam rises to the upper edge of the cofferdam to produce overflow, realizing water circulation inside and outside the cofferdam.
[0004] The current flue gas distribution pipe and heat exchanger layout structure has the following problems: the manifold of the flue gas distribution pipe is isolated in the water bath outside the cofferdam, which can cause the outer wall of the manifold to exchange heat with the water outside the cofferdam due to high temperature. This part of heat cannot quickly enter the inside of the cofferdam, causing the water temperature to be too high, the exhaust smoke temperature to be too high, and the high-temperature heat of the outer wall of the manifold of the flue gas distribution pipe to be unable to be efficiently utilized, thereby reducing the energy utilization rate. In addition, the internal volume of the cofferdam is small, and the liquid phase in the two-phase flow generated inside the cofferdam is small when bubbling, thereby reducing the heat exchange coefficient and increasing the heat loss of the exhaust smoke. Practical new type content
[0005] The embodiment of the present application provides an immersed combustion gasifier, which can solve the technical problems that the current flue gas distribution pipe manifold is isolated in the water bath outside the cofferdam, causing part of the heat to be unable to quickly enter the inside of the cofferdam, resulting in low energy utilization rate, and the internal volume of the cofferdam is small, resulting in low heat exchange coefficient and high heat loss of exhaust smoke.
[0006] The embodiment of the present application provides an immersed combustion gasifier, which comprises a heat exchange coil, a flue gas distribution pipe and a cofferdam frame; the heat exchange coil comprises a heat exchange pipe bundle, the heat exchange pipe bundle is fixed on the cofferdam frame and is at least partially arranged in the cofferdam frame, and a containing space extending along a first direction is arranged on the heat exchange pipe bundle in the cofferdam frame; the flue gas distribution pipe is fixed on the cofferdam frame, the flue gas distribution pipe comprises a flue gas main pipe and a flue gas branch pipe which are communicated, the flue gas main pipe extends along the first direction and is at least partially arranged in the containing space, the flue gas branch pipe is fixedly connected to at least one side of the flue gas main pipe in a second direction, the flue gas branch pipe is arranged in the cofferdam frame, and the flue gas branch pipes are arranged along a third direction and are located below the heat exchange pipe bundle.
[0007] In some embodiments, one end of the flue gas main pipe in the first direction is sealed, the other end of the flue gas main pipe in the first direction is provided with a flue gas inlet, and the flue gas inlet is communicated with the burner.
[0008] In some embodiments, one end of the flue gas branch pipe in the second direction is communicated with the flue gas main pipe, the other end of the flue gas branch pipe in the second direction is sealed, the flue gas branch pipe is provided with a plurality of flue gas exhaust holes at the top in the third direction, and the flue gas exhaust holes are arranged correspondingly to the heat exchange pipe bundle.
[0009] In some embodiments, the flue gas distribution pipe further comprises a supporting leg, the supporting leg is arranged at one end of the flue gas branch pipe away from the flue gas main pipe, and the supporting leg is used for fixedly connecting the flue gas branch pipe and the cofferdam frame.
[0010] In some embodiments, the size of the flue gas main pipe in the second direction is smaller than the size of the flue gas main pipe in the third direction.
[0011] In some embodiments, the projection of the flue gas main pipe on a plane perpendicular to the first direction is a rectangle or a circular-rectangular.
[0012] In some embodiments, the heat exchange pipe bundle comprises a first side connecting branch pipe group and a second side connecting branch pipe group, the first side connecting branch pipe group and the second side connecting branch pipe group are arranged at intervals along the second direction, and the gap between the first side connecting branch pipe group and the second side connecting branch pipe group forms the containing space; and the flue gas branch pipe is fixedly connected to both sides of the flue gas main pipe in the second direction.
[0013] In some embodiments, the heat exchange coil further comprises an inlet header and an outlet header, both of which extend along the second direction, the inlet header is arranged below the outlet header along the third direction, both of which are located on the side of the flue gas main away from the flue gas inlet of the flue gas main; the gas inlets of the first side connection branch group are communicated with one end of the inlet header in the second direction, the gas inlets of the second side connection branch group are communicated with the other end of the inlet header in the second direction, the gas outlets of the first side connection branch group are communicated with one end of the outlet header in the second direction, and the gas outlets of the second side connection branch group are communicated with the other end of the outlet header in the second direction.
[0014] In some embodiments, the heat exchange coil further comprises an inlet flange pipe and an outlet flange pipe, the inlet flange pipe is communicated with the inlet header, and the outlet flange pipe is communicated with the outlet header.
[0015] In some embodiments, the diameter of the inlet flange pipe is smaller than the diameter of the outlet flange pipe.
[0016] In some embodiments, the outlet flange pipe extends along the third direction and is communicated with the top of the outlet header in the third direction; the inlet flange pipe is L-shaped, comprising a first pipe segment and a second pipe segment communicated with each other, the first pipe segment extends along the third direction, the second pipe segment extends along the first direction, one end of the second pipe segment is communicated with the first pipe segment, and the other end of the second pipe segment is communicated with the side of the inlet header in the first direction.
[0017] In some embodiments, the first pipe segment is provided with an inlet flange at the end away from the second pipe segment, and the outlet flange pipe is provided with an outlet flange at the end away from the outlet header.
[0018] In some embodiments, the cofferdam frame comprises a support and a side plate, the flue gas distribution pipe is fixedly connected to the support, the side plate is arranged on both sides of the support in the first direction and both sides of the support in the second direction, and the side plate surrounds the heat exchange tube bundle.
[0019] The heat exchange tube bundle in the cofferdam frame of the submerged combustion gasifier provided by the embodiments of the present application is provided with a containing space, the flue gas main is at least partially arranged in the containing space inside the cofferdam frame, heat can be quickly brought into the cofferdam frame by the flue gas main, the heat lost by convection in the water bath inside the cofferdam frame can be effectively utilized, the flue gas utilization rate is improved, the flue gas main is arranged in the containing space of the heat exchange tube bundle, the heat exchange tube bundle surrounds the flue gas main, the exhaust gas waste heat can be effectively obtained, the flue gas branch pipe is arranged in the cofferdam frame and below the heat exchange tube bundle, the water temperature is balanced, temperature unevenness is avoided, the energy utilization rate is improved as a whole, the heat exchange coefficient is high, and the exhaust gas heat loss is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0020] The technical solutions and other beneficial effects of the present application will be apparent from the following detailed description of the embodiments of the present application, taken in conjunction with the accompanying drawings.
[0021] Figure 1 The structure schematic diagram of the submerged combustion gasifier provided by the embodiments of the present application is shown in the figure.
[0022] Figure 2 The structure schematic diagram of the heat exchange coil provided by the embodiments of the present application is shown in the figure.
[0023] Figure 3 The structure schematic diagram of the flue gas distribution pipe provided by the embodiments of the present application is shown in the figure.
[0024] Figure 4 The internal flow field schematic diagram of the submerged combustion gasifier provided by the embodiments of the present application is shown in the figure.
[0025] The identification in the figure is as follows:
[0026] Heat exchange coil 1, inlet flange 101, inlet header 102, outlet flange 103, outlet header 104, heat exchange tube bundle 105, first side connecting branch pipe group 151, second side connecting branch pipe group 152, containing space 153, inlet flange pipe 106, outlet flange pipe 107, flue gas distribution pipe 2, flue gas inlet 201, flue gas main pipe 202, flue gas branch pipe 203, flue gas exhaust hole 204, support leg 205, cofferdam frame 3, support 31, side plate 32. DETAILED DESCRIPTION
[0027] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.
[0028] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connecting” should be understood in a broad sense, for example, can be fixed connection, can be detachable connection, or integrally connected; can be mechanical connection, or electrical connection or can communicate with each other; can be directly connected, or indirectly connected through intermediate medium, can be the communication between two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0029] In the present application, unless specifically and expressly defined otherwise, a first feature "on" or "under" a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.
[0030] The submerged combustion vaporizer (SCV) combustor and the LNG heat exchanger system are core equipment in the submerged combustion vaporizer, and require high heat exchange efficiency, strong running stability, good coupling effect between the two subsystems, reduced exhaust gas heat loss, and ultimately lower pollutant emissions and higher energy efficiency indicators.
[0031] The current heat exchanger system is usually designed as follows: the cofferdam surrounds the heat exchange coil, and is integrally installed in the water bath pool. The cofferdam upper edge is higher than the water bath pool liquid level height, and the uppermost row of pipes of the heat exchange coil is also higher than the water bath height. The bottom flue gas distribution pipe header is located on one side outside the cofferdam, and a plurality of branch pipes are connected and arranged below the heat exchange coil, and exhaust holes are uniformly arranged. The cofferdam converges the flue gas in the heat exchange coil area, and the liquid level in the cofferdam rises to the cofferdam upper edge to produce overflow, realizing water circulation inside and outside the cofferdam. The flue gas distribution pipe bubbles the high-temperature flue gas generated by the front-end combustion upward from the bottom of the water bath pool cofferdam, while the low-temperature LNG enters the heat exchange coil. The flue gas is directly heated by bubbling to release heat to the medium water in the water bath pool, and the medium water in the water bath pool heats the LNG through the heat exchange coil, finally realizing the endothermic heating process of the LNG.
[0032] The current flue gas distribution pipe and heat exchanger layout structure has the following problems: the header of the flue gas distribution pipe is isolated in the water bath pool outside the cofferdam, which can cause the outer wall of the header to exchange heat with the water outside the cofferdam due to high temperature. This part of heat cannot quickly enter the inside of the cofferdam, causing the water temperature to be relatively high, and the exhaust gas temperature to be relatively high, resulting in the high-temperature heat of the outer wall of the header of the flue gas distribution pipe being unable to be efficiently utilized, reducing the energy utilization rate. Moreover, the internal volume of the cofferdam is relatively small, and the liquid phase in the two-phase flow generated inside the cofferdam during bubbling is relatively small, thereby resulting in a low heat exchange coefficient, high exhaust gas heat loss, and poor thermal inertia.
[0033] Referring to Figure 1 The present application provides a submerged combustion vaporizer. The submerged combustion vaporizer comprises a heat exchange coil 1, a flue gas distribution pipe 2, and a cofferdam frame 3.
[0034] Referring toFigure 1 The cofferdam frame 3 comprises a support 31 and side plates 32. The side plates 32 are arranged on both sides of the support 31 in the first direction X and on both sides of the support 31 in the second direction Y. Specifically, the side plates 32 are arranged around the heat exchange tube bundle 105. Among them, the side plates 32 can effectively limit the activity range of the water bath bubbling from the smoke exhaust hole 204 into the cofferdam frame 3, and try to exchange heat between the flue gas waste heat and the heat exchange tube bundle 105.
[0035] Please refer to Figure 2 The heat exchange coil 1 comprises an inlet flange 101, an inlet header 102, an outlet flange 103, an outlet header 104, a heat exchange tube bundle 105, an inlet flange pipe 106, and an outlet flange pipe 107.
[0036] Among them, the heat exchange tube bundle 105 is fixed on the cofferdam frame 3 and at least partially arranged in the cofferdam frame 3, and the heat exchange tube bundle 105 arranged in the cofferdam frame 3 is provided with a containing space 153 extending along the first direction X. In this embodiment, the heat exchange tube bundle 105 comprises a first side connecting branch pipe group 151 and a second side connecting branch pipe group 152, the first side connecting branch pipe group 151 and the second side connecting branch pipe group 152 are arranged at intervals along the second direction Y, and the gap between the first side connecting branch pipe group 151 and the second side connecting branch pipe group 152 forms the containing space 153.
[0037] Please refer to Figure 2 The first side connecting branch pipe group 151 and the second side connecting branch pipe group 152 each comprise a plurality of parallelly arranged S-shaped coils. Each S-shaped coil is located in a plane perpendicular to the second direction Y. In this embodiment, each S-shaped coil is preferably a six-pass heat exchange coil. In other embodiments, the S-shaped coil can also be a four-pass heat exchange coil, and can also be an eight-pass heat exchange coil, which is not limited in the present application.
[0038] Please refer to Figure 2 The inlet header 102 and the outlet header 104 each extend along the second direction Y, the inlet header 102 is arranged along the third direction Z below the outlet header 104, and the inlet header 102 and the outlet header 104 are located on the side of the flue gas main pipe 202 away from the flue gas inlet 201 of the flue gas main pipe 202. That is, the inlet header 102 and the outlet header 104 are located on the sealed side of the flue gas main pipe 202.
[0039] Please refer to Figure 2The gas inlet of the first side connecting branch pipe group 151 is communicated with one end of the inlet header pipe 102 in the second direction Y, and the gas inlet of the second side connecting branch pipe group 152 is communicated with the other end of the inlet header pipe 102 in the second direction Y. The gas outlet of the first side connecting branch pipe group 151 is communicated with one end of the outlet header pipe 104 in the second direction Y, and the gas outlet of the second side connecting branch pipe group 152 is communicated with the other end of the outlet header pipe 104 in the second direction Y. Specifically, the gas inlet of the first side connecting branch pipe group 151 and the gas inlet of the second side connecting branch pipe group 152 both extend to the outside of the cofferdam frame 3 to be communicated with the inlet header pipe 102, and the gas outlet of the first side connecting branch pipe group 151 and the gas outlet of the second side connecting branch pipe group 152 both extend to the outside of the cofferdam frame 3 to be communicated with the outlet header pipe 104.
[0040] Referring to Figure 2 The inlet flange pipe 106 is communicated with the inlet header pipe 102, and the outlet flange pipe 107 is communicated with the outlet header pipe 104. In this embodiment, the inlet flange pipe 106 is communicated with one end of the inlet header pipe 102 in the second direction Y, and the outlet flange pipe 107 is communicated with the middle of the outlet header pipe 104 in the second direction Y.
[0041] Referring to Figure 2 The diameter of the inlet flange pipe 106 is smaller than the diameter of the outlet flange pipe 107.
[0042] Referring to Figure 2 The outlet flange pipe 107 extends along the third direction Z and is connected to the top of the outlet header pipe 104 in the third direction Z. The inlet flange pipe 106 is L-shaped, and the inlet flange pipe 106 includes a first pipe segment and a second pipe segment. The first pipe segment extends along the third direction Z, and the second pipe segment extends along the first direction X. One end of the second pipe segment is communicated with the first pipe segment, and the other end of the second pipe segment is communicated with one side of the inlet header pipe 102 in the first direction X.
[0043] Referring to Figure 2 The inlet flange 101 is arranged at one end of the first pipe segment away from the second pipe segment, and the outlet flange 103 is arranged at one end of the outlet flange pipe 107 away from the outlet header pipe 104. The inlet flange 101 is communicated with the inlet header pipe 102 through the thinner inlet flange pipe 106 to distribute the LNG outside the upstream boundary into the system. The two sides of the inlet header pipe 102 are respectively connected with the heat exchange pipe bundle 105, which is merged into the outlet header pipe 104 directly above after passing through the heat exchange section of six returns. The gas phase natural gas is expanded from the large-diameter outlet flange 103 to leave the boundary of the submerged combustion vaporization device and enter the pipe network for transportation.
[0044] In the normal operation of the submerged combustion gasification device, LNG enters the heat exchange coil 1 through the inlet flange 101, and the inlet header 102 distributes the LNG to the first side connection branch pipe group 151 and the second side connection branch pipe group 152 of the heat exchange coil 1 from both sides. The high-temperature flue gas generated by the burner enters the flue gas inlet 201, then enters the flue gas main pipe 202, and then uniformly enters each flue gas branch pipe 203, and then bubbles into the water bath in the cofferdam frame 3 through the smoke exhaust hole 204 to perform efficient gas-liquid heat exchange. After the water bath heat exchange, the gas phase natural gas is collected to the outlet header 104, and then output from the outlet flange 103. Please refer to Figure 1 , Figure 3 The flue gas distribution pipe 2 is fixed on the cofferdam frame 3, and the flue gas distribution pipe 2 includes the flue gas main pipe 202 and the flue gas branch pipe 203 which are communicated. Specifically, the flue gas main pipe 202 and the flue gas branch pipe 203 are fixedly connected to the support 31.
[0045] Please refer to Figure 3 The flue gas main pipe 202 extends along the first direction X and is at least partially arranged in the containing space 153. One end of the flue gas main pipe 202 in the first direction X is sealed, and the other end of the flue gas main pipe in the first direction X is provided with the flue gas inlet 201, and the flue gas inlet 201 is communicated with the burner. In this embodiment, the flue gas inlet 201 is located outside the cofferdam frame 3. In other embodiments, the position, shape and size of the flue gas inlet 201 of the flue gas main pipe, the structure coupling of the heat exchange coil 1 and the flue gas distribution pipe 2 can be adjusted according to actual needs.
[0046] Please refer to Figure 3 The size of the flue gas main pipe 202 in the second direction Y is smaller than the size of the flue gas main pipe 202 in the third direction Z. That is, the width of the flue gas main pipe 202 is smaller than the height, which is beneficial to improve the space utilization. The projection of the flue gas main pipe 202 in the plane perpendicular to the first direction X is rectangular or circular rectangular. In this embodiment, the projection of the flue gas main pipe 202 in the plane perpendicular to the first direction X is circular rectangular.
[0047] Please refer to Figure 3 The flue gas branch pipe 203 is fixedly connected to at least one side of the flue gas main pipe 202 in the second direction Y, and the flue gas branch pipe 203 is arranged in the cofferdam frame 3, and the flue gas branch pipe 203 is arranged along the third direction Z and located below the heat exchange pipe bundle 105. In this embodiment, the flue gas branch pipe 203 is fixedly connected to both sides of the flue gas main pipe 202 in the second direction Y.
[0048] Please refer to Figure 3, one end of the flue gas branch pipe 203 in the second direction Y is communicated with the flue gas main pipe 202, the other end of the flue gas branch pipe 203 in the second direction Y is sealed, and the flue gas branch pipe 203 is provided with a plurality of flue gas discharge holes 204 at the top of the third direction Z, and the flue gas discharge holes 204 are arranged correspondingly with the heat exchange pipe bundle 105. Specifically, the size of the flue gas branch pipe 203, the opening size of the flue gas discharge hole 204 and the like can be adjusted according to the amount of flue gas generated by the rated power of the upstream burner.
[0049] Please refer to Figure 3 , the support leg 205 is arranged at one end of the flue gas branch pipe 203 away from the flue gas main pipe 202, and the support leg 205 is used for fixedly connecting the flue gas branch pipe 203 and the cofferdam frame 3. The cofferdam frame 3 is responsible for fixing and supporting the heat exchange coil 1 and the flue gas distribution pipe 2, and forms a water bath space for efficient heat exchange.
[0050] In some embodiments, a switch valve is arranged at the connection position of the flue gas branch pipe 203 and the flue gas main pipe 202. The switch valve can be adjusted in opening degree to control the heat exchange efficiency, so that the temperature of LNG in the heat exchange coil 1 is controllable. In use, the flue gas distribution pipe 2 bubbles up the high-temperature flue gas generated by the front-end burner from the flue gas discharge hole 204 of the flue gas branch pipe 203 in the cofferdam frame in the water bath pool, forming a heat exchange working condition, while the low-temperature liquefied natural gas (LNG) enters the heat exchange coil 1, and the flue gas directly exchanges heat by bubbling to release heat to the medium water in the water bath pool, and the medium water in the water bath pool heats the LNG through the heat exchange pipe bundle 105 of the heat exchange coil 1, finally realizing the endothermic process of the LNG. In this process, the waste heat of the high-temperature flue gas is used to heat the low-temperature liquefied natural gas LNG.
[0051] As Figure 4 shown, a schematic diagram of the internal flow field of the submerged combustion gasifier is shown, the flue gas enters the cofferdam frame 3 from the bottom of the heat exchange coil 1 by jet bubbling through the flue gas distribution pipe 2, the high-temperature flue gas is rapidly cooled and decelerated in the water bath, and the two-phase flow formed continuously sweeps the heat exchange pipe bundle 105, and efficient heat exchange is performed. Due to the upward surge of the two-phase flow from the two sides, the longitudinal shear force together forms a circulating flow field at the edge. Overflow is generated at the upper edge of the cofferdam frame 3, and the fluid outside the cofferdam frame 3 generates a downward flow field to re-enter the lower part of the cofferdam frame 3 to supplement the total liquid phase inside the cofferdam frame 3. The stable and symmetrical flow field is beneficial to the stable gasification of the LNG by the submerged combustion gasification device.
[0052] The immersion combustion gasifier provided by the embodiments of the present application is provided with a containing space 153 on the heat exchange tube bundle 105 in the cofferdam frame 3, and the flue gas main pipe 202 is at least partially arranged in the containing space 153 inside the cofferdam frame 3, so that the heat can be quickly brought into the cofferdam frame 3 by the flue gas main pipe 202, and the heat utilization rate of the exhaust smoke is improved. Moreover, the flue gas main pipe 202 is arranged in the containing space 153 of the heat exchange tube bundle 105, so that the heat exchange tube bundle 105 is arranged around the flue gas main pipe 202 to effectively obtain the exhaust smoke waste heat. The flue gas branch pipe 203 is arranged in the cofferdam frame 3 and below the heat exchange tube bundle 105, so that the water temperature is balanced, the temperature unevenness is avoided, the energy utilization rate is improved as a whole, the heat exchange coefficient is high, and the exhaust smoke heat loss is reduced. The total water proportion and the thermal inertia inside the cofferdam frame 3 are improved, the stability and the heat exchange efficiency of the gasification process of the immersion combustion gasification device are improved, the exhaust smoke heat loss is reduced, and the energy saving is better.
[0053] In the above embodiments, the description of each embodiment has its own emphasis, and the part not described in detail in a certain embodiment can be referred to the related description of other embodiments.
[0054] The immersion combustion gasifier provided by the embodiments of the present application is provided with a containing space 153 on the heat exchange tube bundle 105 in the cofferdam frame 3, and the flue gas main pipe 202 is at least partially arranged in the containing space 153 inside the cofferdam frame 3, so that the heat can be quickly brought into the cofferdam frame 3 by the flue gas main pipe 202, and the heat utilization rate of the exhaust smoke is improved. Moreover, the flue gas main pipe 202 is arranged in the containing space 153 of the heat exchange tube bundle 105, so that the heat exchange tube bundle 105 is arranged around the flue gas main pipe 202 to effectively obtain the exhaust smoke waste heat. The flue gas branch pipe 203 is arranged in the cofferdam frame 3 and below the heat exchange tube bundle 105, so that the water temperature is balanced, the temperature unevenness is avoided, the energy utilization rate is improved as a whole, the heat exchange coefficient is high, and the exhaust smoke heat loss is reduced. The total water proportion and the thermal inertia inside the cofferdam frame 3 are improved, the stability and the heat exchange efficiency of the gasification process of the immersion combustion gasification device are improved, the exhaust smoke heat loss is reduced, and the energy saving is better.
Claims
1. A submerged combustion gasifier, characterized in that, Includes heat exchange coils (1), flue gas distribution pipes (2), and a cofferdam frame (3); The heat exchange coil (1) includes a heat exchange tube bundle (105), which is fixed to the cofferdam frame (3) and at least partially disposed within the cofferdam frame (3). The heat exchange tube bundle (105) located within the cofferdam frame (3) has an accommodating space (153) extending along a first direction (X). The flue gas distribution pipe (2) is fixed to the cofferdam frame (3). The flue gas distribution pipe (2) includes a connected flue gas main pipe (202) and a flue gas branch pipe (203). The flue gas main pipe (202) extends along the first direction (X) and is at least partially disposed within the accommodating space (153). The flue gas branch pipe (203) is fixedly connected to at least one side of the flue gas main pipe (202) in the second direction (Y). The flue gas branch pipe (203) is disposed within the cofferdam frame (3). The flue gas branch pipe (203) and the flue gas branch pipe (203) are arranged along the third direction (Z) and located below the heat exchange tube bundle (105).
2. The submerged combustion gasifier as described in claim 1, characterized in that, The flue gas main (202) is sealed at one end in the first direction (X), and the other end of the flue gas main (202) in the first direction (X) is provided with a flue gas inlet (201), which is connected to the burner.
3. The submerged combustion gasifier as described in claim 2, characterized in that, One end of the flue gas branch pipe (203) in the second direction (Y) is connected to the flue gas main pipe (202), and the other end of the flue gas branch pipe (203) in the second direction (Y) is sealed. The flue gas branch pipe (203) is provided with a plurality of exhaust holes (204) at the top of the third direction (Z), and the exhaust holes (204) are correspondingly arranged with the heat exchange tube bundle (105).
4. The submerged combustion gasifier as described in claim 1, characterized in that, The flue gas distribution pipe (2) also includes a support foot (205), which is located at the end of the flue gas branch pipe (203) away from the flue gas main pipe (202). The support foot (205) is used to fix the flue gas branch pipe (203) and the cofferdam frame (3).
5. The submerged combustion gasifier as described in claim 1, characterized in that, The size of the flue gas main (202) in the second direction (Y) is smaller than the size of the flue gas main (202) in the third direction (Z).
6. The submerged combustion gasifier as described in claim 1, characterized in that, The projection of the flue gas main (202) onto a plane perpendicular to the first direction (X) is rectangular or rounded.
7. The submerged combustion gasifier as described in claim 1, characterized in that, The heat exchange tube bundle (105) includes a first side connecting branch pipe group (151) and a second side connecting branch pipe group (152). The first side connecting branch pipe group (151) and the second side connecting branch pipe group (152) are arranged at intervals along the second direction (Y). The gap between the first side connecting branch pipe group (151) and the second side connecting branch pipe group (152) forms the accommodating space (153). The flue gas branch pipe (203) is fixedly connected to both sides of the flue gas main pipe (202) in the second direction (Y).
8. The submerged combustion gasifier as described in claim 7, characterized in that, The heat exchange coil (1) also includes an inlet manifold (102) and an outlet manifold (104). The inlet manifold (102) and the outlet manifold (104) both extend along the second direction (Y). The inlet manifold (102) and the outlet manifold (104) are arranged along the third direction (Z) and located below the outlet manifold (104). The inlet manifold (102) and the outlet manifold (104) are both located on the side of the flue gas main pipe (202) away from the flue gas inlet (201) of the flue gas main pipe (202) in the first direction (X). The air inlet of the first side connecting branch pipe group (151) is connected to one end of the inlet manifold (102) in the second direction (Y), the air inlet of the second side connecting branch pipe group (152) is connected to the other end of the inlet manifold (102) in the second direction (Y), the air outlet of the first side connecting branch pipe group (151) is connected to one end of the outlet manifold (104) in the second direction (Y), and the air outlet of the second side connecting branch pipe group (152) in the second direction (Y) is connected to the other end of the outlet manifold (104) in the second direction (Y).
9. The submerged combustion gasifier as described in claim 8, characterized in that, The heat exchange coil (1) also includes an inlet flange (106) and an outlet flange (107), wherein the inlet flange (106) is connected to the inlet manifold (102) and the outlet flange (107) is connected to the outlet manifold.
10. The submerged combustion gasifier as described in claim 9, characterized in that, The diameter of the inlet flange (106) is smaller than the diameter of the outlet flange (107).
11. The submerged combustion gasifier as described in claim 10, characterized in that, The outlet flange (107) extends along the third direction (Z) and connects to the top of the outlet manifold (104) in the third direction (Z); The inlet flange pipe (106) is L-shaped and includes a first pipe section and a second pipe section that are connected. The first pipe section extends along the third direction (Z), and the second pipe section extends along the first direction (X). One end of the second pipe section is connected to the first pipe section, and the other end of the second pipe section is connected to the inlet manifold on the side of the first direction (X).
12. The submerged combustion gasifier as described in claim 11, characterized in that, The first pipe section is provided with an inlet flange (101) at the end away from the second pipe section, and the outlet flange pipe (107) is provided with an outlet flange (103) at the end away from the outlet manifold.
13. The submerged combustion gasifier as described in claim 1, characterized in that, The cofferdam frame (3) includes a support (31) and a side plate (32). The flue gas distribution pipe (2) is fixedly connected to the support (31). The side plate (32) is disposed on both sides of the support (31) in the first direction (X) and on both sides of the support (31) in the second direction (Y). The side plate (32) is disposed around the heat exchange tube bundle (105).