Submerged combustion type gasifier

Abstract

The utility model discloses a submerged combustion type gasifier, belongs to the technical field of low-temperature liquid gasification, and aims to solve the technical problem that LNG (Liquefied Natural Gas) conversion efficiency is influenced due to non-uniform heating of a water tank and a heat exchanger by a flue gas distribution pipe in the prior art. A burner assembly, a distribution pipe assembly and a heat exchanger assembly are arranged in the gasifier pool. A chimney is further arranged on one side of the gasifier water tank; the distribution pipe assembly comprises a main pipe and a plurality of branch pipes respectively communicated with the main pipe; one end of the main pipe is communicated with the burner assembly, and the other end of the main pipe is closed; the ends, away from the main pipe, of the multiple branch pipes act on the lower portion of the heat exchanger assembly. The main pipe is a variable cross-section pipe. The submerged combustion type gasifier is high in heat utilization efficiency, good in heat exchange performance, convenient to install and long in service life.

Description

Technical Field

[0001] The utility model relates to the technical field of cryogenic liquid gasification, and particularly relates to a submerged combustion vaporizer. Background Art

[0002] A submerged combustion vaporizer (SCV) is a device that uses the combustion heat of natural gas as a heat source to vaporize liquefied natural gas (LNG). The basic structure of a submerged combustion vaporizer usually consists of equipment such as a fan, a burner, a flue gas distribution pipe, a heat exchanger, a water tank, a chimney, and a control system; in actual operation, air and fuel gas are transported to the burner by a fan and fully mixed and burned therein, and the high-temperature flue gas generated after combustion heats the water in the water tank through the flue gas distribution pipe, and the LNG in the heat exchanger is vaporized by the way of water bath heating and enters the output pipe network.

[0003] In the prior art, when heating the heat exchanger through the flue gas distribution pipe, due to the uneven distribution of gas pressure in the axial direction of the flue gas distribution pipe, the heating of the water body in the water tank and the heat exchanger is uneven, thereby affecting the LNG conversion efficiency. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a submerged combustion vaporizer to solve the technical problem that the uneven heating of the water tank and the heat exchanger by the flue gas distribution pipe in the prior art affects the LNG conversion efficiency.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A submerged combustion vaporizer provided by the utility model includes:

[0007] A vaporizer water tank, in which a burner assembly distribution pipe assembly and a heat exchanger assembly are respectively arranged; a chimney is also arranged on one side of the vaporizer water tank;

[0008] The distribution pipe assembly includes a main pipe and a plurality of branch pipes respectively communicated with the main pipe; one end of the main pipe is communicated with the burner assembly, and the other end is closed; the ends of the plurality of branch pipes far away from the main pipe act on the lower part of the heat exchanger assembly; the main pipe is a variable cross-section pipe.

[0009] The utility model provides the heat required for LNG vaporization through the burner assembly, the fuel burns in the burner assembly and acts on the heat exchanger assembly through the distribution pipe assembly, and the flue gas generated by combustion is discharged through the chimney after heat exchange;

[0010] By arranging the distribution pipe assembly, the bubbles in the shell side of the heat exchanger assembly are made uniform, and the foaming penetrates through the entire load change range; wherein the main pipe is a variable cross-section pipe, so that the pressure loss of the gas in the main pipe in the axial direction is reduced, and the gas pressure in the pipe is kept uniform.

[0011] Optionally or preferably, the burner assembly includes a combustion chamber, a burner disposed in the combustion chamber, and a blower system communicating with the burner;

[0012] The input end of the burner communicates with the blower system, and the output end of the burner communicates with the main pipe.

[0013] Optionally or preferably, the burner assembly further includes a pump body and a cooling jacket disposed on the outer side wall of the combustion chamber;

[0014] The pump body is used to pump the water in the vaporizer water tank into the cooling jacket and make the water entering the cooling jacket return to the vaporizer water tank again.

[0015] In the present utility model, the burner is disposed inside the combustion chamber, and part of the combustion chamber is immersed in the water bath of the vaporizer water tank. In order to make the best use of the heat energy in the combustion chamber, a cooling jacket is disposed on the outer side wall of the combustion chamber. The water in the vaporizer water tank is pumped into the cooling jacket by the pump body for heat exchange, and the water after heat exchange enters the water tank again through the pump body and acts on the heat exchanger assembly to complete the cycle.

[0016] Optionally or preferably, the heat exchanger assembly includes a support weir and a coil disposed in the support weir; the support weir and the coil are integrally skid-mounted;

[0017] One end of the coil close to the distribution pipe assembly is the input end, and the end far from the distribution pipe assembly is the output end; the input end and the output end are respectively communicated with external pipelines.

[0018] Optionally or preferably, the cross-sectional radius of the main pipe is gradually reduced along the internal air flow direction; the communication hole between the main pipe and the branch pipe is an oblong hole.

[0019] By gradually reducing the cross-sectional radius of the main pipe, the pressure in the main pipe is made uniform, so that the air distribution of multiple branch pipes is uniform, and further the distribution pipe assembly can uniformly heat the heat exchanger assembly and the water body in the water tank.

[0020] Optionally or preferably, an overflow port, a drain port and a water injection port are respectively provided on the vaporizer water tank;

[0021] An alkali tank passage is further communicated with the lower part of the vaporizer water tank; the alkali tank passage is used to add alkaline substances into the vaporizer water tank.

[0022] Since gases such as carbon dioxide in the combustion products will be absorbed by the water in the water tank to produce carbonic acid, and sulfuric acid will be generated due to the presence of sulfur in the natural gas additive; in order to reduce the generation of the above acidic substances and minimize the possibility of components in the vaporizer being corroded, the present utility model adjusts the pH value of the water in the water tank by providing an alkali tank passage at the lower part of the vaporizer water tank and adding an alkaline substance, such as sodium hydroxide solution, into the vaporizer water tank through this alkali tank passage.

[0023] Optionally or preferably, a pressure differential transmitter, a pressure detection device, a liquid level gauge and a temperature measuring device are further provided on the vaporizer water tank;

[0024] The pressure differential transmitter, the pressure detection device, the liquid level gauge and the temperature measuring device are electrically connected to a control system; the control system is a PLC control system.

[0025] Optionally or preferably, a spiral guide plate is provided in the cooling jacket.

[0026] Based on the above technical solutions, the present utility model can at least produce the following technical effects:

[0027] For the submerged combustion vaporizer provided by the present utility model, through the variable cross-section main pipe in the distribution pipe assembly, the pressure in the main pipe is made uniform, so that the air distribution of multiple branch pipes is uniform, and further the distribution pipe assembly can uniformly heat the heat exchanger assembly and the water body in the water tank;

[0028] By providing an alkali tank passage at the lower part of the vaporizer water tank, an alkaline substance can be added into the vaporizer water tank, which can reduce the generation of acidic substances and minimize the possibility of components in the vaporizer being corroded;

[0029] By providing a cooling jacket on the outer side wall of the combustion chamber, the heat in the combustion chamber can be fully utilized;

[0030] In the heat exchanger assembly, the support weir and the coil are integrally skid-mounted. During the transportation and hoisting of the heat exchanger assembly, the support weir can protect the coil; in addition, the support weir completely surrounds the coil, leaving only the top and bottom of the coil, so that the two-phase mixture formed by the high-temperature flue gas generated by combustion and the water in the support weir flows upward, thus forming a circulation with the water in the water tank outside the support weir. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of the submerged combustion vaporizer of the present utility model.

[0032] In the figure: 10, vaporizer water tank; 11, caustic tank passage; 21, combustion chamber; 22, burner; 23, fan system; 24, pump body; 31, main pipe; 32, branch pipe; 41, support weir; 42, coil pipe; 43, input end; 44, output end; 50, chimney. Detailed implementation manner

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0034] Embodiment:

[0035] Please refer to Figure 1 , a submerged combustion vaporizer, including a vaporizer water tank 10, an overflow port, a drain port and a water injection port are respectively arranged on the vaporizer water tank 10, a detachable cover plate is arranged on the top of the vaporizer water tank 10, and a standard manhole is arranged on the cover plate for internal maintenance and inspection passage; the vaporizer water tank 10 is filled with water through the water injection port, and a burner assembly, a distribution pipe assembly and a heat exchanger assembly are respectively arranged inside it. A chimney 50 is also arranged on the upper part of the vaporizer water tank 10. After the high-temperature flue gas generated by the burner assembly exchanges heat with the heat exchanger assembly, it is discharged through the chimney 50.

[0036] In this embodiment, the above-mentioned distribution pipe assembly includes a main pipe 31 and a plurality of branch pipes 32 communicated with the main pipe 31; wherein, one end of the main pipe 31 is communicated with the burner assembly. After the high-temperature flue gas generated by the burner assembly enters the main pipe 31, it acts on the bottom of the heat exchanger assembly and the water body of the vaporizer water tank 10 through the above-mentioned plurality of branch pipes 32.

[0037] In order to reduce the pressure loss of the high-temperature flue gas in the main pipe 31 in the axial direction, in this embodiment, the main pipe 31 is a variable cross-section pipe, and the communication hole between the main pipe 31 and the branch pipe 32 is an oblong hole; specifically, the cross-sectional radius of the main pipe 31 is gradually reduced along the internal gas flow direction; it can be understood that one end of the main pipe 31 is communicated with the burner assembly, and the other end is closed. The above-mentioned internal gas flow direction is from the end of the main pipe 31 close to the burner assembly to the closed end of the main pipe 31.

[0038] In this embodiment, the burner assembly includes a pump body 24, a combustion chamber 21, a burner 22 arranged in the combustion chamber 21 and a fan system 23 communicated with the burner 22; wherein the fan system 23 is used to pump fuel gas and air into the burner 22 for combustion, and provide power for the high-temperature flue gas generated by combustion.

[0039] In this embodiment, the burner 22 is arranged above the water surface, and part of the combustion chamber 21 is immersed in the water bath of the water tank. To make full use of the heat energy in the combustion chamber 21, a cooling jacket is arranged on the outer side wall of the combustion chamber 21; the combustion chamber 21 that is not immersed in the water body is cooled through the cooling jacket.

[0040] Specifically, the pump body 24 pumps the water in the vaporizer water tank 10 into the cooling jacket. After heat exchange, it is then introduced back into the vaporizer water tank 10 to complete the cycle; in order to improve the heat exchange effect of the water in the cooling jacket, in this embodiment, a spiral guide plate is also arranged in the above-mentioned cooling jacket.

[0041] In addition, in this embodiment, the burner 22 can use multiple burners to meet the variable load requirements; at low loads, only the low-fire gas nozzles are opened; the above-mentioned multiple burner settings can not only ensure the requirements of load changes, but also ensure the uniformity of the flame temperature field, thereby reducing the generation of nitrogen oxides.

[0042] In this embodiment, the heat exchanger assembly includes a support weir 41 fixed in the vaporizer water tank 10 and a coil 42 horizontally installed in the support weir 41; the support weir 41 and the coil 42 are integrally skid-mounted; one end of the coil 42 is fixed, and the other end can freely expand and contract thermally; the support weir 41 surrounds the coil 42 on all sides, leaving only the top and bottom of the coil, so that the two-phase mixture formed by the high-temperature flue gas generated by combustion and the water in the support weir 41 flows upward, thus forming a cycle with the water in the water tank outside the support weir 41.

[0043] In addition, the support weir 41 and the coil 42 are integrally skid-mounted, so that during the transportation and hoisting of the heat exchanger assembly, the support weir 41 can protect the coil 42.

[0044] In this embodiment, the lower end port of the coil 42 is the input end 43 of LNG, and the upper end port is the output end 44 of the product NG after LNG gasification.

[0045] During the actual working process, since gases such as carbon dioxide in the combustion products will be absorbed by the water in the vaporizer water tank 10 to produce carbonic acid, and sulfuric acid will be generated due to the presence of sulfur in the natural gas additive; in order to reduce the generation of the above-mentioned acidic substances and minimize the possibility of corrosion of the components in the vaporizer, the present utility model sets an alkali tank channel 11 at the lower part of the vaporizer water tank 10, and adds an alkaline substance, such as sodium hydroxide solution, into the vaporizer water tank 10 through this alkali tank channel 11, so as to adjust the pH value of the water in the water tank and avoid the influence of acidic substances on the vaporizer.

[0046] In addition, in this embodiment, corresponding pressure differential transmitters, pressure detection devices, liquid level gauges and temperature measurement devices (not shown in the figure) are also provided in the vaporizer water tank 10; the above-mentioned pressure differential transmitters, pressure detection devices, liquid level gauges and temperature measurement devices are all electrically connected to the control system.

[0047] In this embodiment, the above control system can be a PLC control system. Through this PLC control system, functions such as data acquisition, process control, logical operation, sequence control and interlock control of the vaporizer device are completed.

[0048] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A submerged combustion gasifier, characterized in that: include: A gasifier pool (10), wherein a burner assembly, a distribution pipe assembly and a heat exchanger assembly are respectively arranged in the gasifier pool (10); a chimney (50) is also arranged on one side of the gasifier pool (10); The distribution pipe assembly comprises a main pipe (31) and a plurality of branch pipes (32) respectively connected to the main pipe (31); one end of the main pipe (31) is connected to the burner assembly, and the other end is closed; one end of the plurality of branch pipes (32) away from the main pipe (31) acts on the lower part of the heat exchanger assembly; the main pipe (31) is a variable cross-section pipe.

2. The submerged combustion gasifier according to claim 1, characterized in that: The burner assembly comprises a combustion chamber (21), a burner (22) disposed in the combustion chamber (21), and a fan system (23) connected to the burner (22); The input end of the burner (22) is connected to the fan system (23), and the output end of the burner (22) is connected to the main pipe (31).

3. The submerged combustion gasifier according to claim 2, characterized in that: The burner assembly further comprises a pump body (24) and a cooling jacket arranged on the outer side wall of the combustion chamber (21); The pump body (24) is used to pump the water in the gasifier water pool (10) into the cooling jacket, and to return the water that has entered the cooling jacket to the gasifier water pool (10).

4. The submerged combustion gasifier according to claim 1, characterized in that: The heat exchanger assembly comprises a support weir (41) and a coil (42) arranged in the support weir (41); the support weir (41) and the coil (42) are integrally skid-mounted; The end of the coil (42) close to the distribution pipe assembly is the input end (43), and the end away from the distribution pipe assembly is the output end (44); the input end (43) and the output end (44) are respectively connected to external pipelines.

5. The submerged combustion gasifier according to claim 1, characterized in that: The cross-sectional radius of the main pipe (31) is gradually reduced along the internal airflow direction; and the connecting hole between the main pipe (31) and the branch pipe (32) is an oblong hole.

6. The submerged combustion gasifier according to claim 1, characterized in that: The gasifier water pool (10) is also provided with an overflow port, a drain port and a water injection port; The lower part of the gasifier water pool (10) is also connected to an alkali tank channel (11); the alkali tank channel (11) is used to add alkaline substances into the gasifier water pool (10).

7. The submerged combustion gasifier according to claim 1, characterized in that: The gasifier water pool (10) is also provided with a pressure differential transmitter, a pressure detection device, a liquid level meter and a temperature measurement device; The pressure differential transmitter, pressure detection device, liquid level gauge and temperature measurement device are electrically connected to the control system; the control system is a PLC control system.

8. The submerged combustion gasifier according to claim 3, characterized in that: A spiral guide plate is arranged in the cooling jacket.

Images