Cooling system of communicating structure between converter and synthesis gas waste heat boiler

Abstract

The utility model provides a cooling system of a communication structure between a reformer and a synthesis gas waste heat boiler, which belongs to the technical field of reformer equipment and comprises a communicating pipe which is a jacketed pipe, is connected with an outlet of the reformer and an inlet of the synthesis gas waste heat boiler and is used for conveying synthesis gas from the reformer; a medium outlet of the communicating pipe is connected with a desalted water tank, a water outlet of the desalted water tank is connected with a desalted water cooler through a cooling water pump, and an outlet of the desalted water cooler is communicated with a medium inlet of the communicating pipe; the desalted water tank is also provided with a water replenishing pipeline, and a water replenishing valve is arranged on the water replenishing pipeline; the water supplementing pipeline is further connected with a net supplementing pipeline, the net supplementing pipeline is connected with a medium inlet of the communicating pipe, and a net supplementing valve is arranged on the net supplementing pipeline. The joint of the net supplementing pipeline and the water supplementing pipeline is arranged on the water inflow front side of the water supplementing valve. The system can timely cool the existing communication structure, ensures that the temperature does not exceed the standard, ensures that the reformer stably operates for a long time in a high-temperature environment, and improves the operation safety of equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of converter equipment, in particular to a cooling system having a communication structure between a converter and a synthetic gas waste heat boiler. Background Art

[0002] In recent years, coal-to-ethylene glycol is now a hot spot for new coal chemical industry. Coke oven gas, as a precious chemical raw material gas, can completely replace coal-to-syngas to produce ethylene glycol. The process flow of coke oven gas to ethylene glycol includes: gas purification, gas storage in gas tanks, pressurization, hydrogenation, desulfurization, partial catalytic conversion of pure oxygen, separation of H2 and CO, compression, and ethylene glycol synthesis. The conversion unit is mainly completed by the converter and its accessories. The high-temperature synthesis gas from the converter will first be sent to the synthesis gas waste heat boiler to generate usable steam by recovering the high-temperature waste heat of the synthesis gas. The converter and the synthesis gas waste heat boiler are connected and transported by a connecting structure. The commonly used connecting structure is a connecting pipe. However, when the converter is running at full load, there is often a situation where the temperature of the connecting pipe is too high (over 354°C). This temperature has exceeded the process index (350°C), which is easy to cause the overheating section furnace wall to burn out, affecting the personal safety of on-site operators, and there are hidden dangers in the safe operation of the system. Utility Model Content

[0003] The utility model provides a cooling system for a connecting structure between a reformer and a synthesis gas waste heat boiler, which is used to solve the problem that the temperature of the existing connecting structure is too high, which easily causes the overheating section furnace wall to burn out, affecting the personal safety of on-site operators and the safety of system operation.

[0004] The utility model provides a cooling system of a communication structure between a converter and a synthesis gas waste heat boiler, comprising: a communication pipe, which is a jacketed pipe, connected to the converter outlet and the synthesis gas waste heat boiler inlet, and used for conveying the synthesis gas from the converter; a medium outlet of the communication pipe is connected to a desalted water tank, a water outlet of the desalted water tank is connected to a desalted water cooler through a cooling water pump, and the outlet of the desalted water cooler is communicated with the medium inlet of the communication pipe; the cooling medium of the desalted water cooler is circulating water; the desalted water tank is also provided with a water replenishment pipeline, and a water replenishment valve is provided on the water replenishment pipeline; the water replenishment pipeline is also connected to a net replenishment pipeline, the net replenishment pipeline is connected to the medium inlet of the communication pipe, and a net replenishment valve is provided on the net replenishment pipeline; the connection between the net replenishment pipeline and the water replenishment pipeline is arranged at the front side of the incoming water of the water replenishment valve.

[0005] Preferably, a liquid level meter is provided in the desalted water tank, the liquid level meter is interlocked with the water supply valve, and the liquid level of the desalted water tank is controlled to be 0.5-1.5m.

[0006] Preferably, the connecting pipe includes an inner pipe, an intermediate pipe is sleeved on the outer side of the inner pipe, and an outer pipe is sleeved on the outer side of the intermediate pipe; the two ends of the inner pipe are sealed and connected to the two ends of the intermediate pipe through circular ring plates respectively; the connecting pipe also includes a synthesis gas inlet and a synthesis gas outlet, the synthesis gas inlet and the synthesis gas outlet are respectively connected to the two ends of the outer pipe, and are connected to the inner pipe at the same time; the medium inlet and the medium outlet are respectively connected to the intermediate pipe; the synthesis gas inlet and the medium outlet are jointly arranged at one end of the connecting pipe, and the synthesis gas outlet and the medium inlet are jointly arranged at the other end of the connecting pipe.

[0007] Preferably, the inner tube, the middle tube and the outer tube are arranged concentrically, and the materials of the inner tube, the middle tube and the outer tube are all high temperature resistant and corrosion resistant materials.

[0008] Preferably, a flow isolation tube is further provided between the inner tube and the middle tube, both ends of the flow isolation tube are not in contact with the circular ring plates at both ends, and the flow isolation tube is suspended on the outer side of the inner tube through a support frame.

[0009] Preferably, fins are provided on the outer wall of the inner tube and the inner wall of the intermediate tube.

[0010] Preferably, a plurality of guide plates are evenly and staggeredly arranged on the inner wall of the inner tube in the circumferential direction, and each guide plate is inclined toward the synthesis gas outlet.

[0011] Preferably, a filter is provided before the medium inlet of the connecting pipe.

[0012] Preferably, the filter is provided with three filter layers, the first filter layer is an activated carbon filter layer, the second filter layer is a porous ceramic filter layer, and the third filter layer is a textile fiber filter layer.

[0013] The cooling system of the connecting structure between the converter and the synthesis gas waste heat boiler provided by the utility model adopts a connecting pipe with a jacketed pipe structure to connect the converter and the synthesis gas waste heat boiler, and utilizes the desalted water circulating inside the connecting pipe to absorb part of the heat of the high-temperature synthesis gas, thereby ensuring that the temperature of the connecting pipe does not exceed the process indicator of 350°C, avoiding the surface overheating phenomenon that is currently common in the connecting pipe, ensuring that the converter can operate stably for a long time in a high-temperature environment without being damaged by high temperature, increasing the safety of equipment operation, and ensuring the safety of on-site operators.

[0014] The connecting pipe in this system has a compact structure. The high-temperature synthesis gas flows in the inner pipe and the outer pipe, which increases the heat exchange area of ​​the synthesis gas. The desalted water in the middle layer can absorb the heat on both sides to the maximum extent, meet the cooling and heat exchange requirements, and improve the heat exchange efficiency. While increasing the heat exchange intensity, it effectively reduces the structure length and saves the use space. It has the advantages of large heat exchange area, good cooling effect, reasonable thermal stress distribution, and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of a cooling system for a communication structure between a reformer and a syngas waste heat boiler provided in one embodiment of the utility model;

[0017] Figure 2 A schematic diagram of the structure of a connecting pipe provided in one embodiment of the utility model;

[0018] Figure 3 for Figure 2 Sectional view in the AA direction;

[0019] Figure 4 This is a schematic structural diagram of a connecting pipe provided in another embodiment of the utility model.

[0020] Description of reference numerals:

[0021] 1-connecting pipe, 2-converter, 3-synthesis gas waste heat boiler, 4-desalting water tank, 5-cooling water pump, 6-desalting water cooler, 7-water supply pipe, 8-net supply pipe, 9-filter, 11-synthesis gas inlet, 12-synthesis gas outlet, 13-medium outlet, 14-medium inlet, 15-inner pipe, 16-middle pipe, 17-outer pipe, 18-circular ring plate, 41-liquid level gauge, 71-water supply valve, 81-net supply valve, 151-guide plate, 161-flow separator, 162-support frame, 163-fin. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the utility model.

[0023] like Figure 1The utility model provides a cooling system of a communication structure between a reformer and a synthesis gas waste heat boiler, comprising: a connecting pipe 1, the connecting pipe 1 is a jacketed pipe, the connecting pipe 1 connects the outlet of the reformer 2 and the inlet of the synthesis gas waste heat boiler 3, and is used to transport the synthesis gas from the reformer 2; the medium outlet 13 of the connecting pipe 1 is connected to a desalted water tank 4, the water outlet of the desalted water tank 4 is connected to a desalted water cooler 6 through a cooling water pump 5, and the outlet of the desalted water cooler 6 is connected to the medium inlet 14 of the connecting pipe 1; the cooling medium of the desalted water cooler 6 is circulating water; the desalted water tank 4 is also provided with a water supply pipe 7, and a water supply valve 71 is provided on the water supply pipe 7; the water supply pipe 7 is also connected to a net supply pipe 8, the net supply pipe 8 is connected to the medium inlet 14 of the connecting pipe 1, and a net supply valve 81 is provided on the net supply pipe 8; the connection between the net supply pipe 8 and the water supply pipe 7 is arranged on the front side of the water supply valve 71.

[0024] The connecting pipe 1 connects the converter 2 and the syngas waste heat boiler 3, and sends the high-temperature syngas generated by the converter 2 to the syngas waste heat boiler 3 to recover the high-temperature waste heat of the syngas. When the high-temperature syngas passes through the connecting pipe 1, it is cooled by the cooling medium in the connecting pipe 1 - desalted water, to ensure that the temperature of the connecting pipe 1 does not exceed the process indicator of 350°C, avoiding the common surface overheating phenomenon of the connecting pipe 1, ensuring the long-term stable operation of the converter 2 in a high-temperature environment, and increasing the safety of equipment operation. In actual production, there are usually two groups of converters 2 and their matching connecting pipes 1 and syngas waste heat boilers 3, which are often in a state of one open and one standby. Therefore, the two groups of connecting pipes 1 are connected in parallel to facilitate the operation and switching of the cooling system.

[0025] The connecting pipe 1 adopts a jacketed pipe structure, and uses the desalted water circulating inside it to absorb part of the heat of the high-temperature synthesis gas. The temperature of the connecting pipe 1 is reduced by the cooling effect, which can effectively prevent the internal and surface temperatures of the connecting pipe 1 from being too high and avoid the risk of burning the furnace wall. Desalted water is pure water that has been processed to remove impurities and ions, and has good thermal conductivity. Using desalted water as a heat transfer medium will not cause scaling inside the pipeline, ensuring the normal operation of the jacketed pipe. By regularly replacing and maintaining the desalted water, the cleanliness and heat transfer efficiency of the connecting pipe 1 can be maintained. The number of cooling water pumps 5 is based on ensuring the circulating water volume and heat transfer efficiency, and is selected by technical personnel in this field according to production conditions to ensure that the internal temperature of the connecting pipe 1 can be effectively controlled to ensure the safe operation and stability of the entire system.

[0026] The desalted water reenters the desalted water tank 4 after absorbing heat, and in the next cycle, is cooled by the desalted water cooler 6. The desalted water cooler 6 uses the circulating water in the process pipe network to transfer heat, and the circulating water after absorbing heat is cooled and circulated through the process pipe network. The desalted water tank 4 can be replenished with water through the water replenishment pipe 7 to control the liquid level of the desalted water tank 4 within a certain range. When the water replenishment valve 71 fails or the desalted water pump fails, the network replenishment pipe 8 can be used to directly supply desalted water to the connecting pipe 1 to ensure that the cooling system can continue to cool down.

[0027] Preferably, a liquid level meter 41 is provided in the desalted water tank 4, and the liquid level meter 41 is interlocked with the water supply valve 71, and the liquid level of the desalted water tank 4 is controlled to be 0.5-1.5m. The interlocked liquid level meter 41 and the water supply valve 71 can more accurately control the liquid level in the desalted water tank 4 and control the liquid level to be 0.5-1.5m. When the liquid level in the desalted water tank 4 is lower than 0.5m, the water supply valve 71 automatically opens, and when the liquid level is greater than 1.5m, the water supply valve 71 automatically closes. An overflow pipe can also be provided on the top of the desalted water tank 4. When the liquid level in the desalted water tank 4 is high, it can be directly discharged into the ditch through the overflow pipe.

[0028] like Figure 2 and Figure 3 Preferably, the connecting pipe 1 includes an inner pipe 15, an intermediate pipe 16 is sleeved on the outer side of the inner pipe 15, and an outer pipe 17 is sleeved on the outer side of the intermediate pipe 16; the two ends of the inner pipe 15 are sealed and connected to the two ends of the intermediate pipe 16 through circular ring plates 18 respectively; the connecting pipe 1 also includes a synthesis gas inlet 11 and a synthesis gas outlet 12, the synthesis gas inlet 11 and the synthesis gas outlet 12 are respectively connected to the two ends of the outer pipe 17, and are also connected to the inner pipe 15; the medium inlet 14 and the medium outlet 13 are respectively connected to the intermediate pipe 16; the synthesis gas inlet 11 and the medium outlet 13 are jointly arranged at one end of the connecting pipe 1, and the synthesis gas outlet 12 and the medium inlet 14 are jointly arranged at the other end of the connecting pipe 1.

[0029] The inner tube 15, the middle tube 16 and the outer tube 17 divide the connecting tube 1 into three layers of space, wherein the innermost and outermost spaces are connected to the synthesis gas inlet 11 for conveying high-temperature synthesis gas, and the middle layer is connected to the medium inlet 14 for conveying the cooling medium - desalted water. The desalted water is sandwiched between two layers of high-temperature synthesis gas and can be heat exchanged simultaneously through the inner tube 15 and the middle tube 16. Compared with single-sided heat exchange, the heat exchange per unit time is higher, the heat exchange efficiency is higher, and the utilization rate of the cooling medium is also improved, which effectively reduces the structural length while improving the heat exchange intensity. At the same time, the high-temperature synthesis gas and desalted water in the jacketed tube are countercurrently exchanged, which strengthens the overall heat exchange intensity of the connecting tube 1.

[0030] Preferably, the inner tube 15, the middle tube 16 and the outer tube 17 are arranged concentrically, and the materials of the inner tube 15, the middle tube 16 and the outer tube 17 are all high temperature resistant and corrosion resistant materials. High temperature resistant and corrosion resistant materials such as alloy steel, stainless steel, etc. can withstand corrosion and pressure changes in high temperature environments, effectively alleviate the heat loss problem during the heat transfer process of the tube surface, and improve the heat exchange efficiency of the connecting tube 1.

[0031] like Figure 4 Preferably, a flow separator 161 is further provided between the inner tube 15 and the middle tube 16. Both ends of the flow separator 161 are not in contact with the annular plates 18 at both ends, and the flow separator 161 is suspended on the outside of the inner tube 15 through a support frame 162. The flow separator 161 can guide the desalted water in the middle layer. The flow velocity and turbulence degree of the desalted water after stratification are different, which can provide different heat transfer coefficients, increase the effective utilization rate of the cooling medium, and improve the heat exchange effect. The shape of the support frame 162 is not particularly limited, as long as it can play the role of fixing and supporting the flow separator 161.

[0032] like Figure 4 Preferably, fins 163 are provided on the outer wall of the inner tube 15 and the inner wall of the intermediate tube 16. The shape of the fins 163 is not particularly limited, and can be a cylinder, a cone, or a prism commonly used in the art. The presence of the fins 163 can increase the turbulence of the desalted water when it flows in the intermediate tube 16, so that the cooling medium can contact the tube walls of the inner tube 15 and the intermediate tube 16 more evenly, which helps to strengthen heat exchange and improve the heat exchange effect.

[0033] like Figure 4 Preferably, a plurality of guide plates 151 are evenly and staggeredly arranged on the inner wall of the inner tube 15 in the circumferential direction, and each guide plate 151 is inclined toward the syngas outlet 12. The guide plates 151 also play a guiding role, which can increase the turbulence of the high-temperature syngas in the inner tube 15 to improve the heat exchange efficiency. The shape of the guide plates 151 is not particularly limited, and any shape commonly used in the art can be used.

[0034] In order to prevent the desalted water from carrying impurities during long-term circulation and causing blockage of the connecting pipe 1, Figure 1 Preferably, a filter 9 is provided in front of the medium inlet 14 of the connecting pipe 1. More preferably, the filter 9 is provided with three filter layers, the first filter layer is an activated carbon filter layer, the second filter layer is a porous ceramic filter layer, and the third filter layer is a textile fiber filter layer. The multiple filter layers in the filter 9 are used together to filter various impurities such as scale, metal drops, suspended matter, colloids and microorganisms in the desalted water, with good filtering effect, ensuring the running stability of the jacketed pipe and reducing its clogging risk.

[0035] The present invention is further described in detail below in conjunction with specific embodiments.

[0036] Example 1

[0037] The cooling system of the connecting structure between the reformer 2 and the syngas waste heat boiler 3, when working, the high-temperature syngas enters the connecting pipe 1 through the syngas inlet 11, and after being separated by the annular plate 18, flows into the inside of the inner pipe 15 and the space between the outer pipe 17 and the intermediate pipe 16 respectively, and is discharged into the syngas waste heat boiler 3 from the syngas outlet 12. The desalted water in the desalted water tank 4 is pressurized to 0.08MPa by the cooling water pump 5, and then sent to the desalted water cooler 6, heat exchanged with the circulating water therein and cooled to 30-40°C, and then enters the intermediate pipe 16 from the medium inlet 14 of the connecting pipe 1, cools the high-temperature syngas flowing in the inner pipe 15 and the outer pipe 17, and then flows out from the medium outlet 13 and returns to the desalted water tank 4, and the return water pressure is 0.04MPa and the temperature is 70°C. Among them, the outlet pressure of the cooling water pump 5 is set to 0.05MPa, the frequency of the cooling water pump 5 is 32-33Hz, the liquid level of the desalted water tank 4 is set to 0.5-1.5m, and the desalted water temperature at the medium inlet 14 is controlled at <40°C. When the temperature is high, the circulating water flow of the desalted water cooler 6 needs to be adjusted to ensure its temperature.

[0038] Example 2

[0039] On the basis of the above embodiment, this embodiment also includes: a flow separator 161 is provided between the inner tube 15 and the middle tube 16, and the flow separator 161 can guide the desalted water in the middle layer, thereby increasing the effective utilization rate of the cooling medium.

[0040] Fins 163 are provided on the outer wall of the inner tube 15 and the inner wall of the intermediate tube 16 . The fins 163 are cylindrical in shape and can increase the turbulence of the desalted water when it flows in the intermediate tube 16 , which helps to enhance heat exchange.

[0041] A plurality of guide plates 151 are evenly and staggeredly arranged on the inner wall of the inner tube 15 in the circumferential direction, which can increase the turbulence of the high-temperature synthesis gas in the inner tube 15 to improve the heat exchange efficiency.

[0042] Example 3

[0043] On the basis of the above embodiment, this embodiment further includes: a filter 9 is provided in front of the medium inlet 14 of the connecting pipe 1, and three filter layers are provided in the filter 9, the first filter layer is an activated carbon filter layer, the second filter layer is a porous ceramic filter layer, and the third filter layer is a textile fiber filter layer. The multiple filter layers in the filter 9 are used together to filter various impurities such as scale, metal drops, suspended matter, colloids and microorganisms in the desalted water, with good filtering effect, ensuring the running stability of the jacketed pipe and reducing its clogging risk.

[0044] It should be noted that in the present invention, the detailed structure of some devices is not described in detail, but belongs to the prior art known to those skilled in the art, so it will not be repeated here. In addition, the parts not involved in the device are the same as the prior art or can be implemented by the prior art.

[0045] It should be noted that pressure sensors, flow meters or temperature sensors are installed on the transmission pipelines inside the system between different units, devices or equipment. Different valves are also installed, such as pressure relief valves, pressure regulating valves, safety valves, etc., which are used to adjust and stabilize the pressure of the entire system.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it; although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A cooling system for a communication structure between a reformer and a syngas waste heat boiler, characterized in that: include: A connecting pipe, the connecting pipe is a jacketed pipe, the connecting pipe connects the outlet of the reformer and the inlet of the syngas waste heat boiler, and is used to transport the syngas from the reformer; the medium outlet of the connecting pipe is connected to a desalted water tank, the water outlet of the desalted water tank is connected to a desalted water cooler through a cooling water pump, and the outlet of the desalted water cooler is connected to the medium inlet of the connecting pipe; the cooling medium of the desalted water cooler is circulating water; The desalted water tank is also provided with a water replenishment pipe, on which a water replenishment valve is provided; the water replenishment pipe is also connected to a net replenishment pipe, which is connected to the medium inlet of the connecting pipe, and on which a net replenishment valve is provided; the connection between the net replenishment pipe and the water replenishment pipe is arranged on the front side of the incoming water of the water replenishment valve.

2. The cooling system of the communication structure between the reformer and the syngas waste heat boiler according to claim 1 is characterized in that: The desalted water tank is provided with a liquid level meter, which is interlocked with the water replenishment valve. The liquid level of the desalted water tank is controlled to be 0.5-1.5m.

3. The cooling system of the communication structure between the reformer and the synthesis gas waste heat boiler according to claim 1 is characterized in that: The connecting pipe includes an inner pipe, an intermediate pipe is sleeved on the outer side of the inner pipe, and an outer pipe is sleeved on the outer side of the intermediate pipe; the two ends of the inner pipe are sealed and connected to the two ends of the intermediate pipe through circular ring plates respectively; the connecting pipe also includes a synthesis gas inlet and a synthesis gas outlet, and the synthesis gas inlet and the synthesis gas outlet are respectively connected to the two ends of the outer pipe and are simultaneously connected to the inner pipe; the medium inlet and the medium outlet are respectively connected to the intermediate pipe; the synthesis gas inlet and the medium outlet are jointly arranged at one end of the connecting pipe, and the synthesis gas outlet and the medium inlet are jointly arranged at the other end of the connecting pipe.

4. The cooling system of the communication structure between the reformer and the syngas waste heat boiler according to claim 3 is characterized in that: The inner tube, the middle tube and the outer tube are arranged concentrically, and the materials of the inner tube, the middle tube and the outer tube are all high temperature resistant and corrosion resistant materials.

5. The cooling system of the communication structure between the reformer and the synthesis gas waste heat boiler according to claim 3 is characterized in that: A flow isolation tube is also provided between the inner tube and the middle tube. Both ends of the flow isolation tube are not in contact with the annular plates at both ends, and the flow isolation tube is suspended and sleeved on the outer side of the inner tube through a support frame.

6. The cooling system of the communication structure between the reformer and the syngas waste heat boiler according to claim 3, characterized in that: The outer wall of the inner tube and the inner wall of the middle tube are both provided with ribs.

7. The cooling system of the communication structure between the reformer and the synthesis gas waste heat boiler according to claim 3, characterized in that: A plurality of guide plates are evenly and staggeredly arranged on the inner wall of the inner tube along the circumferential direction, and each of the guide plates is inclined toward the synthesis gas outlet.

8. The cooling system of the communication structure between the reformer and the syngas waste heat boiler according to any one of claims 1 to 7, characterized in that: A filter is provided in front of the medium inlet of the connecting pipe.

9. The cooling system of the communication structure between the reformer and the synthesis gas waste heat boiler according to claim 8, characterized in that: The filter is provided with three filter layers, the first filter layer is an activated carbon filter layer, the second filter layer is a porous ceramic filter layer, and the third filter layer is a textile fiber filter layer.

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