A crude acetone overhead gas phase heat recovery device in a phenol plant

Abstract

The application discloses a crude acetone overhead gas phase heat recovery device in a phenol device, and belongs to the technical field of heat recovery. The application discloses a crude acetone overhead gas phase heat recovery device in a phenol device, and belongs to the technical field of heat recovery. The application discloses a crude acetone overhead gas phase heat recovery device in a phenol device, and belongs to the technical field of heat recovery. The application discloses a crude acetone overhead gas phase heat recovery device in a phenol device, and belongs to the technical field of heat recovery. The application discloses a crude acetone overhead gas phase heat recovery device in a phenol device, and belongs to the technical field of heat recovery. The application discloses a crude acetone overhead gas phase heat recovery device in a phenol device, and belongs to the technical field of heat recovery. The application discloses a crude acetone overhead gas phase heat recovery device in a phenol device, and belongs to the technical field of heat recovery. The application discloses a crude acetone overhead gas phase heat recovery device in a phenol device, and belongs to the technical field of heat recovery. The application discloses a crude acetone overhead gas phase heat recovery device in a phenol device, and belongs to the technical field of heat recovery. The application discloses a crude acetone overhead gas phase heat recovery device in a phenol device, and belongs to

Description

Technical Field

[0001] This invention relates to a gas phase heat recovery device at the top of the crude acetone tower in a phenol plant, belonging to the field of heat recovery technology. Background Technology

[0002] In the phenol production process, a large amount of gaseous material is continuously discharged from the top of the crude acetone tower. This gaseous material is not simply waste gas, but carries a considerable amount of heat. However, traditional treatment methods have failed to achieve efficient utilization of this heat. In most cases, this heat-laden gaseous material enters the condenser in the crude acetone tower for condensation, but during this process, heat recovery is insufficient, and a large amount of usable heat remains unrecovered.

[0003] This inadequate heat recovery has caused several negative impacts. From an energy perspective, the failure to recover and reuse a large amount of usable heat means that more fuel or other energy sources are needed to meet process requirements, directly leading to energy waste. Excessive energy consumption further increases production costs, putting companies under greater cost pressure in market competition. This paper proposes a vapor-phase heat recovery device at the top of the crude acetone tower in a phenol plant. Summary of the Invention

[0004] In view of the above-mentioned technical deficiencies, the purpose of this invention is to provide a gas phase heat recovery device at the top of the crude acetone tower in a phenol plant, which aims to efficiently recover the heat carried by the gas phase at the top of the crude acetone tower and realize the rational utilization of energy.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a gas phase heat recovery device at the top of the crude acetone tower in a phenol plant, comprising: The outer shell has a heat exchange chamber inside, and multiple first guide plates are arrayed on both sides of the heat exchange chamber; A partition plate is disposed in the middle of the heat exchange chamber, and multiple second guide plates are arrayed on both sides of the partition plate; A liquid guide pipe is installed inside the heat exchange chamber and is used to guide the flow of liquid organic working fluid. The inlet and outlet ends of the liquid guide pipe extend outside the heat exchange chamber. The ends of multiple first guide plates and multiple second guide plates are all curved, and the corresponding first guide plates and second guide plates are arranged opposite each other to form a vortex groove, and the liquid guide tube is inserted into the inside of the vortex groove.

[0006] Preferably, the lower end of the outer shell is fixed with a lower end cover for sealing the bottom of the heat exchange chamber, and the lower end cover is provided with an air inlet pipe for introducing crude acetone tower tail gas into the heat exchange chamber. The upper end of the air inlet pipe is connected to the bottom of the heat exchange chamber, and the lower end of the air inlet pipe is connected to the crude acetone tower. The upper end of the outer shell is fixed with an upper cover for sealing the top of the heat exchange chamber. The upper cover is provided with an exhaust pipe for discharging the crude acetone tower tail gas from the heat exchange chamber. The lower end of the exhaust pipe is connected to the top of the heat exchange chamber.

[0007] Preferably, the spacer is movably connected inside the heat exchange cavity.

[0008] Preferably, springs are provided at both the upper and lower ends of the partition plate, with the upper end of the spring located at the upper end of the partition plate abutting against the lower surface of the upper end cover, and the lower end of the spring located at the lower end of the partition plate abutting against the upper surface of the lower end cover.

[0009] Preferably, both the upper and lower surfaces of the outer casing are provided with sealing gaskets, which are used to seal the connection between the upper surface of the outer casing and the upper cover, and the lower surface of the outer casing and the lower cover, respectively.

[0010] Preferably, multiple inclined channels are provided between the two sides of the partition plate and the side wall of the heat exchange cavity, and the multiple inclined channels are distributed intersectingly with multiple vortex grooves.

[0011] Preferably, the liquid guide tube has a multi-segment U-shaped structure.

[0012] Preferably, the liquid guide tube is made of aluminum alloy.

[0013] Preferably, both sides of the outer shell are provided with heat-insulating shells for covering the bends of the liquid guide tube, and the inlet and outlet ends of the liquid guide tube pass through the corresponding heat-insulating shells and extend to the outside.

[0014] Preferably, the outer shell is covered with an insulating outer layer.

[0015] Compared with existing technologies: 1. In this invention, a vortex groove is formed by the opposing arrangement of a first guide plate and a second guide plate. A liquid guide pipe is inserted inside the vortex groove, and the liquid guide pipe has a multi-segment structure, with each straight segment located in the middle of the corresponding vortex groove. This arrangement allows the exhaust gas to form a vortex within the vortex groove, increasing the contact time and contact area between the exhaust gas and the liquid organic working fluid in the liquid guide pipe, thus enabling heat to be transferred more fully from the exhaust gas to the liquid organic working fluid.

[0016] 2. This invention utilizes a partition plate movably connected inside the heat exchange chamber, with springs installed at its upper and lower ends. When the tail gas from the crude acetone tower flows within the heat exchange chamber, the resulting gas pressure causes the partition plate to move. This movement of the partition plate disturbs the tail gas within the heat exchange chamber, disrupting the laminar flow of the tail gas and ensuring more thorough and uniform contact between the tail gas and the liquid guide pipe. This further accelerates heat transfer, significantly improving heat exchange efficiency and achieving efficient recovery of the gas phase heat from the top of the crude acetone tower.

[0017] 3. This invention features heat-insulating shells on both sides of the outer casing to cover the bends in the liquid guide tube, preventing heat loss due to direct contact between the tube and outside air at the bends. Simultaneously, the outer casing is covered with an insulating layer, further preventing heat transfer from the device's interior to the external environment. This allows the device to better maintain its internal temperature, improving the quality and stability of heat recovery and reducing energy waste. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 This is a cross-sectional view of the outer shell, the first guide plate, the spacer plate, and the second guide plate of the present invention.

[0020] Figure 3 For the present invention Figure 2 Enlarged view of point A.

[0021] Figure 4 This is an exploded view of the outer shell, liquid guide tube, lower end cap, upper end cap, and insulation shell of the present invention.

[0022] Figure 5 This is an exploded cross-sectional view of the outer casing, lower end cover, and upper end cover of the present invention.

[0023] Figure 6 This is a schematic diagram of the structure of the liquid guide tube of the present invention.

[0024] Figure 7 This is an exploded cross-sectional view of the outer casing and the spacer plate of the present invention.

[0025] In the picture: 1. Outer shell; 101. Heat exchange chamber; 1011. Inclined channel; 102. First guide plate; 2. Spare plate; 201. Second guide plate; 3. Liquid guide pipe; 4. Vortex groove; 5. Insulation outer layer; 6. Lower end cover; 7. Air inlet pipe; 8. Upper end cover; 9. Exhaust pipe; 10. Sealing gasket; 11. Insulation shell; 12. Spring. Detailed Implementation

[0026] The present invention is illustrated below with specific embodiments, but these are not intended to limit the invention.

[0027] Example 1 like Figures 1-7As shown in this embodiment, a gas phase heat recovery device at the top of the crude acetone tower in a phenol apparatus includes a shell 1. A heat exchange chamber 101 is provided inside the shell 1. Multiple first guide plates 102 are arrayed on both sides of the heat exchange chamber 101, with their ends curved. A partition plate 2 is provided in the middle of the heat exchange chamber 101, with multiple second guide plates 201 arrayed on both sides of the partition plate 2, their ends also curved. A liquid guide pipe 3 is provided inside the heat exchange chamber 101, used to guide the flow of liquid organic working fluid. The inlet and outlet ends of the liquid guide pipe 3 extend outside the heat exchange chamber 101. The ends of the multiple first guide plates 102 and the multiple second guide plates 201 are all curved, and the corresponding first guide plates 102 and second guide plates 201 are arranged opposite each other to form a vortex groove 4. The liquid guide pipe 3 is inserted into the interior of the vortex groove 4.

[0028] Sealing gaskets 10 are provided on both the upper and lower ends of the outer casing 1, which are used to seal the connection between the upper end of the outer casing 1 and the upper end cover 8, and the lower end of the outer casing 1 and the lower end cover 6, respectively.

[0029] Multiple inclined channels 1011 are provided between the two sides of the partition plate 2 and the side wall of the heat exchange cavity 101, and the multiple inclined channels 1011 are interspersed with multiple vortex grooves 4.

[0030] The liquid guide tube 3 is made of aluminum alloy and has a multi-segment U-shaped structure. Each straight section of the liquid guide tube 3 is located in the middle of the corresponding vortex tank 4. The liquid organic working medium in the liquid guide tube 3 exchanges heat with the exhaust gas flowing in the vortex tank 4.

[0031] Both sides of the outer shell 1 are provided with heat-insulating shells 11 for covering the bends of the liquid guide tube 3. The inlet and outlet ends of the liquid guide tube 3 pass through the corresponding heat-insulating shells 11 and extend to the outside.

[0032] The outer shell 1 is covered with an insulating outer layer 5.

[0033] Example 2 Based on Embodiment 1, in this embodiment, the lower end of the outer shell 1 is fixed with a lower end cover 6 for sealing the bottom of the heat exchange chamber 101. The lower end cover 6 is provided with an air inlet pipe 7 for introducing the tail gas of the crude acetone tower into the heat exchange chamber 101. The upper end of the air inlet pipe 7 is connected to the bottom of the heat exchange chamber 101, and the lower end of the air inlet pipe 7 is connected to the crude acetone tower. The upper end of the outer shell 1 is fixed with an upper end cover 8 for sealing the top of the heat exchange chamber 101. The upper end cover 8 is provided with an exhaust pipe 9 for discharging the crude acetone tower tail gas in the heat exchange chamber 101. The lower end of the exhaust pipe 9 is connected to the top of the heat exchange chamber 101.

[0034] Example 3 Based on the above embodiments, in this embodiment, the partition plate 2 is movably connected inside the heat exchange chamber 101. When the crude acetone tower tail gas flows in the heat exchange chamber 101, the gas pressure generated during the flow will cause the partition plate 2 to move. The movement of the partition plate 2 can disturb the crude acetone tower tail gas in the heat exchange chamber 101, so that the heat can be transferred to the liquid organic working medium in the liquid guide pipe 3 more quickly, thereby improving the heat exchange efficiency.

[0035] Springs 12 are provided at both the upper and lower ends of the partition plate 2. The upper end of the spring 12 located at the upper end of the partition plate 2 abuts against the lower surface of the upper end cover 8, and the lower end of the spring 12 located at the lower end of the partition plate 2 abuts against the upper surface of the lower end cover 6.

[0036] The process is as follows: The gaseous tail gas discharged from the top of the crude acetone tower enters the bottom of the heat exchange chamber 101 through the inlet pipe 7. As the tail gas flows within the heat exchange chamber 101, it first passes through the inclined channel 1011, where its flow direction and velocity are initially adjusted, before entering the vortex channel 4. Within the vortex channel 4, the tail gas forms a strong vortex, exchanging heat efficiently with the liquid organic working fluid in the liquid guide pipe 3 inserted within it. Simultaneously, the gas pressure generated by the tail gas flow causes the partition plate 2 to move, disturbing the tail gas and further accelerating heat transfer, ensuring that heat is absorbed by the liquid organic working fluid to the maximum extent. This process is the key starting point for the entire waste heat recovery power generation process. Through ingenious structural design, the thermal energy in the tail gas is efficiently transferred to the liquid organic working fluid, laying the foundation for subsequent power generation.

[0037] After heat exchange, the exhaust gas temperature decreases and it is discharged through exhaust pipe 9 (the gaseous substance enters the condenser in the crude acetone tower for condensation). Meanwhile, the liquid organic working fluid in the liquid guide pipe 3, having absorbed heat, experiences a rapid increase in temperature and pressure. After flowing out from the water outlet, it is quickly transported to the ORC (Organic Rankine Cycle) power generation system. As the core component of waste heat power generation, the ORC power generation system fully utilizes the high-temperature and high-pressure energy contained in the organic working fluid that has absorbed waste heat.

[0038] In an ORC power generation system, the high-temperature, high-pressure liquid organic working fluid first passes through an expander. The expander acts like a "magic box" for energy conversion, where the organic working fluid rapidly expands and performs work, efficiently converting energy, originally existing as heat, into mechanical energy. This process is based on the principle of the organic Rankine cycle, achieving the initial conversion of heat energy into mechanical energy through the phase change and expansion of the organic working fluid.

[0039] The mechanical energy generated by the expander then drives the generator to produce electricity. As the key device for converting mechanical energy into electrical energy, the generator, driven by mechanical energy, has its internal rotor rotating at high speed, cutting magnetic field lines to generate current, thus achieving the final conversion of heat energy into electrical energy. This series of processes is closely linked, highly efficient, and orderly, successfully converting potentially wasted exhaust heat into clean electrical energy, providing additional power support for the company's production and operation, reducing dependence on the external power grid, and effectively saving energy costs.

[0040] After power generation, the low-temperature, low-pressure organic working fluid is cooled by a condenser. The condenser exchanges heat with an external cooling medium, rapidly lowering the temperature of the organic working fluid until it returns to a liquid state. The liquid organic working fluid can then be recycled back into the liquid guide pipe 3 to absorb heat, forming a complete cycle of power generation. This recycling method not only improves energy utilization efficiency but also reduces the consumption of organic working fluid and lowers operating costs, demonstrating the advanced nature and sustainability of RD41 technology in waste heat power generation.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate and not limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention without departing from the spirit and scope of the present invention. Any modifications or partial substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A vapor phase heat recovery device at the top of the crude acetone tower in a phenol plant, characterized in that, include: The outer shell (1) has a heat exchange chamber (101) inside, and multiple first guide plates (102) are arrayed on both sides of the heat exchange chamber (101). A partition plate (2) is disposed in the middle of the heat exchange chamber (101), and multiple second guide plates (201) are arrayed on both sides of the partition plate (2). Liquid guide pipe (3) is installed inside the heat exchange chamber (101). The liquid guide pipe (3) is used to guide the liquid organic working fluid. The inlet and outlet of the liquid guide pipe (3) extend out of the heat exchange chamber (101). The ends of multiple first guide plates (102) and multiple second guide plates (201) are all curved, and the corresponding first guide plates (102) and second guide plates (201) are arranged opposite to each other to form a vortex groove (4), and the liquid guide pipe (3) is inserted into the inside of the vortex groove (4).

2. The vapor phase heat recovery device at the top of the crude acetone tower in a phenol plant according to claim 1, characterized in that, The lower end of the outer shell (1) is fixed with a lower end cover (6) for sealing the bottom of the heat exchange chamber (101). The lower end cover (6) is provided with an air inlet pipe (7) for introducing the tail gas of the crude acetone tower into the heat exchange chamber (101). The upper end of the air inlet pipe (7) is connected to the bottom of the heat exchange chamber (101), and the lower end of the air inlet pipe (7) is connected to the crude acetone tower. The upper end of the outer shell (1) is fixed with an upper end cover (8) for sealing the top of the heat exchange chamber (101). The upper end cover (8) is provided with an exhaust pipe (9) for discharging the crude acetone tower tail gas in the heat exchange chamber (101). The lower end of the exhaust pipe (9) is connected to the top of the heat exchange chamber (101).

3. The vapor phase heat recovery device at the top of the crude acetone tower in a phenol unit according to claim 2, characterized in that, The spacer plate (2) is movably connected inside the heat exchange chamber (101).

4. The vapor phase heat recovery device at the top of the crude acetone tower in a phenol unit according to claim 3, characterized in that, Springs (12) are provided at both the upper and lower ends of the partition plate (2). The upper end of the spring (12) at the upper end of the partition plate (2) abuts against the lower surface of the upper end cover (8), and the lower end of the spring (12) at the lower end of the partition plate (2) abuts against the upper surface of the lower end cover (6).

5. The vapor phase heat recovery device at the top of the crude acetone tower in a phenol unit according to claim 2, characterized in that, The upper and lower surfaces of the outer shell (1) are provided with sealing gaskets (10), which are used to seal the connection between the upper surface of the outer shell (1) and the upper cover (8), and the lower surface of the outer shell (1) and the lower cover (6), respectively.

6. The vapor phase heat recovery device at the top of the crude acetone tower in a phenol unit according to claim 1, characterized in that, Multiple inclined channels (1011) are provided between the two sides of the partition plate (2) and the side wall of the heat exchange cavity (101), and the multiple inclined channels (1011) and multiple vortex grooves (4) are distributed intersectingly.

7. The vapor phase heat recovery device at the top of the crude acetone tower in a phenol unit according to claim 1, characterized in that, The liquid guide tube (3) has a multi-segment U-shaped structure.

8. The vapor phase heat recovery device at the top of the crude acetone tower in a phenol plant according to claim 1, characterized in that, The liquid guide tube (3) is made of aluminum alloy.

9. The vapor phase heat recovery device at the top of the crude acetone tower in a phenol unit according to claim 1, characterized in that, Both sides of the outer shell (1) are provided with heat-insulating shells (11) for covering the bends of the liquid guide tube (3). The inlet and outlet ends of the liquid guide tube (3) pass through the corresponding heat-insulating shells (11) and extend to the outside.

10. The vapor phase heat recovery device at the top of the crude acetone tower in a phenol unit according to claim 1, characterized in that, The outer shell (1) is covered with an insulating outer layer (5).

Images