C4 water washing tower

Abstract

The invention relates to the technical field of water scrubber, and discloses a C4 water scrubber which comprises a water scrubber body, the top of the water scrubber body is connected with an adsorber, the top of the adsorber is connected with a gas outlet pipe, an adsorption cavity is formed in the adsorber, and a molecular sieve is fixedly connected in the adsorption cavity. A heating assembly, a condensing assembly and a cooling assembly are sequentially connected between the adsorber and the water washing tower main body from bottom to top, and the outer wall of the adsorber is connected with a regeneration assembly. According to the C4 water washing tower, the moisture content in C4 gas adsorbed by the molecular sieve is remarkably reduced, so that the purity of the C4 gas is improved, the activity or stability of a catalyst in subsequent reaction is ensured, the reaction efficiency and the product quality are ensured, and meanwhile, the viscosity of a gas phase is reduced due to the reduction of the moisture; the diffusion of the gas in the reactor becomes easier, and the transmission performance of the gas in the pipeline and the reactor is improved.

Description

Technical Field

[0001] The invention relates to the technical field of water washing towers, in particular to a carbon four water washing tower. Background Art

[0002] C4 usually refers to hydrocarbon compounds containing four carbon atoms, including butane, 1-butene, 2-butene, isobutylene, butadiene and other products or mixtures. Such compounds play an important role in petrochemicals because they are not only one of the important raw materials for the production of fuels, but also the basis for synthetic rubber, plastics and other chemical products. In the field of petrochemicals, water washing of C4 fractions is a common processing step to remove impurities or pre-treat before further processing. A water washing tower is a commonly used water washing equipment that uses countercurrent contact between gas and liquid to achieve purification purposes. The C4 fraction usually enters from the bottom of the tower, while the washing water is sprayed from the top of the tower, and the two are fully in contact in the packing layer or plate structure. In this process, impurities with higher solubility will be absorbed by water, thereby achieving the purification of the C4 fraction.

[0003] For example, in the prior art, the patent with the patent authorization announcement number CN117919875B discloses a high-efficiency water washing tower, including: a tower body, the bottom of the tower body is connected to an air inlet pipe, and a demisting layer is arranged on the top of the tower body; a spray pipe, a packing layer is arranged between each two adjacent spray pipes, and a partition is arranged under each packing layer, the partition is located between each packing layer and the spray pipe adjacent to the bottom thereof, and a water receiving chamber is formed between each partition and the packing layer adjacent to the top thereof, and each partition is provided with an air hole; a filter box, the upper part of the filter box is connected to the water receiving chamber, and the lower part of the filter box is connected to the spray pipe adjacent to the bottom of the water receiving chamber; a water storage chamber, the top of the water storage chamber is connected to a water supply pipe, and the water supply pipe is used to supply water to the spray pipe at the top; a control mechanism is used to make the spray pipe spray water evenly. The above device has the effect of improving the efficiency and quality of waste gas treatment.

[0004] However, the above-mentioned water scrubber still has certain defects when used: When the above-mentioned water washing tower washes the C4 gas with water, the C4 gas is brought into contact with water to remove impurities therein. However, in this process, due to the strong interaction between the gas and liquid phases, some water will be entrained into the gas flow in the form of tiny droplets, which will reduce the purity of the C4 gas and may affect the activity or stability of the catalyst in subsequent reactions, thereby reducing the reaction efficiency or product quality. At the same time, the presence of water mist increases the viscosity of the gas phase, making it more difficult to diffuse the gas in the reactor, thereby affecting the subsequent transmission efficiency of the gas. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a C4 water washing tower capable of removing moisture carried in the C4 gas.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a carbon four water washing tower, comprising a water washing tower body, an adsorber connected to the top of the water washing tower body, an air outlet pipe connected to the top of the adsorber, an adsorption chamber opened inside the adsorber, a molecular sieve fixedly connected inside the adsorption chamber, a heating component, a condensing component and a cooling component connected in sequence from bottom to top between the adsorber and the water washing tower body, and a regeneration component connected to the outer wall of the adsorber.

[0007] Furthermore, the heating component includes a heater, a heating coil, a support plate and a controller. The bottom of the heater is fixedly connected to the top of the water washing tower body. A heating chamber is opened inside the heater, and a heating coil is installed in the heating chamber. A plurality of support plates corresponding to the positions of the heating coils are fixedly connected to the inner wall of the heating chamber. The outer wall of the heater is fixedly connected to the controller, and the controller and the heating coil are electrically connected.

[0008] Furthermore, the condensation component includes a condenser, an isolation plate, a heat absorbing plate, an air guide plate, a baffle, a drain pipe and a drain valve. The condenser is fixedly connected to the top of the heater, an air guide pipe is opened between the heater and the condenser, an isolation plate is fixedly connected to the inside of the condenser, an air inlet groove is arranged below the isolation plate, the air inlet groove is connected to the air guide pipe, an air guide groove is arranged on the top of the air inlet groove, a baffle corresponding to the position of the air guide groove is fixedly connected to the inside of the condenser, a plurality of heat absorbing plates are fixedly connected to the surface of the isolation plate, an air guide plate is fixedly connected to the top of the heat absorbing plate, a water collecting tank is opened on the side of the condenser away from the air inlet tank, a drain pipe connected to the water collecting tank is fixedly connected to the bottom of the condenser, and a drain valve is fixedly connected to the middle of the drain pipe.

[0009] Furthermore, the cooling component includes a condenser and a cooling pipe. The condenser is fixedly connected to the top of the condenser. The outer wall of the condenser is provided with a cooling pipe. The cooling pipe is connected to an external water source.

[0010] Furthermore, a lower valve is fixedly connected between the top of the condenser and the bottom of the adsorber, and an upper valve is fixedly connected between the top of the adsorber and the air outlet pipe.

[0011] Furthermore, the regeneration component includes an exhaust pipe, an exhaust valve, an intake pipe and an intake valve. The exhaust pipe is fixedly connected to the bottom outer wall of the adsorber, the exhaust valve is fixedly connected to the middle of the exhaust pipe, the intake pipe is fixedly connected to the top outer wall of the adsorber, the intake valve is fixedly connected to the middle of the intake pipe, and the intake pipe and the exhaust pipe are symmetrically arranged with respect to the center.

[0012] Furthermore, the heating coil includes a plurality of meandering coils and a plurality of circular coils. The meandering coils are placed longitudinally to form a circle, and the circular coils are placed transversely and fixedly connected to the outer edges of the meandering coils.

[0013] Furthermore, a plurality of longitudinally arranged water diversion grooves are provided on both sides of the outer wall of the heat absorbing plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) The water content of the C4 gas adsorbed by the molecular sieve in this C4 water washing tower is significantly reduced, thereby improving the purity of the C4 gas, ensuring the activity and stability of the catalyst in the subsequent reaction, ensuring the reaction efficiency and product quality. At the same time, the reduction of water reduces the viscosity of the gas phase, making it easier for the gas to diffuse in the reactor, improving the transmission performance of the gas in the pipeline and the reactor. Removing water can also reduce unnecessary side reactions and reduce the generation of by-products, thereby reducing the cost of subsequent separation and purification; (2) Through the heat exchange between the heat absorbing plate and the gas, the water vapor in the C4 gas is effectively condensed into liquid water and discharged from the system, which significantly reduces the moisture content in the gas. The moisture in the C4 gas is removed once by condensation before the molecular sieve, which reduces the amount of moisture entering the molecular sieve, reduces the adsorption pressure of the molecular sieve, increases the service life of the molecular sieve, reduces the regeneration frequency and maintenance cost of the molecular sieve, and also improves the moisture removal effect; (3) Through cooling treatment, ensure that the C4 gas is in a suitable low temperature state when entering the adsorber, so as to maintain the best adsorption effect of the molecular sieve; (4) The combination of the circular coil and the round coil significantly improves the heating efficiency, ensures that the gas can be heated up quickly and evenly, and reduces the heating time. The multi-layer and multi-directional heating network design ensures a more uniform temperature distribution in the heating chamber, avoids local overheating or underheating, and improves the heating effect and system stability. (5) The water inlet trough can increase the contact area between the C4 gas and the heat absorbing plate. When the C4 gas flows through the heat absorbing plate, it will also be affected by more turbulence, thereby enhancing the convective heat transfer effect and improving the heat transfer efficiency. At the same time, the design of the water inlet trough can effectively guide the flow of condensed water, preventing the condensed water from forming droplets on the surface of the heat absorbing plate and being carried forward by the high-speed flowing C4 gas, thereby ensuring the dryness of the C4 gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the heating component, condensing component and cooling component of the present invention; Figure 3 It is a schematic diagram of a three-dimensional split cross-sectional structure of a heating component of the present invention; Figure 4 It is a schematic diagram of the three-dimensional cross-sectional structure of the condensing component of the present invention; Figure 5 It is a front view of the condensation assembly of the present invention; Figure 6It is a schematic diagram of the three-dimensional cross-sectional structure of the air guide plate and the heat absorption plate of the present invention; Figure 7 for Figure 6 An enlarged three-dimensional cross-sectional structural diagram at A above; Figure 8 It is a three-dimensional structural schematic diagram of the adsorber, the upper valve and the lower valve of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional cross-sectional structure of the adsorber and the molecular sieve of the present invention; Fig.10 It is a schematic diagram of the three-dimensional structure of the heating coil of the present invention.

[0016] In the figure: 1. water washing tower body; 2. adsorber; 3. air outlet pipe; 4. heater; 5. heating coil; 6. support plate; 7. controller; 8. condenser; 9. air inlet slot; 10. isolation plate; 11. air guide slot; 12. heat absorbing plate; 13. air guide plate; 14. water collecting slot; 15. water guide slot; 16. drain pipe; 17. drain valve; 18. condenser; 19. cooling pipe; 20. lower valve; 21. upper valve; 22. exhaust pipe; 23. exhaust valve; 24. air inlet pipe; 25. air inlet valve; 26. adsorption chamber; 27. baffle; 28. round coil; 29. ​​circular coil; 30. heating chamber; 31. air guide pipe; 32. molecular sieve. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] See also Figures 1 to 10 A carbon four water washing tower comprises a water washing tower body 1, an adsorber 2 is connected to the top of the water washing tower body 1, an air outlet pipe 3 is connected to the top of the adsorber 2, an adsorption chamber 26 is opened inside the adsorber 2, a molecular sieve 32 is fixedly connected inside the adsorption chamber 26, a heating component, a condensing component and a cooling component are connected between the adsorber 2 and the water washing tower body 1 from bottom to top, and a regeneration component is connected to the outer wall of the adsorber 2.

[0019] In the C4 water washing tower of the present invention, after the water washing tower body 1 completes the water washing of the C4 gas, the moist C4 gas will enter the adsorption chamber 26 inside the adsorber 2, and the molecular sieve 32 will efficiently adsorb the moisture in the gas, and the water molecules are fixed in the microporous structure of the molecular sieve 32, while the C4 gas passes smoothly and is transported to the pipeline by the outlet pipe 3; the moisture content in the C4 gas adsorbed by the molecular sieve 32 is significantly reduced, thereby improving the purity of the C4 gas, ensuring the activity and stability of the catalyst in the subsequent reaction, ensuring the reaction efficiency and product quality, and at the same time, the reduction of moisture reduces the viscosity of the gas phase, making it easier for the gas to diffuse in the reactor, improving the transmission performance of the gas in the pipeline and the reactor, and removing moisture can also reduce unnecessary side reactions and reduce the generation of by-products, thereby reducing the cost of subsequent separation and purification.

[0020] As a preferred technical solution of the present invention, the heating component includes a heater 4, a heating coil 5, a support plate 6 and a controller 7. The bottom of the heater 4 is fixedly connected to the top of the water washing tower body 1. A heating chamber 30 is opened inside the heater 4, and a heating coil 5 is installed in the heating chamber 30. A plurality of support plates 6 corresponding to the positions of the heating coils 5 are fixedly connected to the inner wall of the heating chamber 30. The controller 7 is fixedly connected to the outer wall of the heater 4, and the controller 7 and the heating coil 5 are electrically connected.

[0021] Specifically, the heating component can fully heat the C4 gas passing through the heating chamber 30, so that small droplets, water mist, etc. in the C4 gas are directly evaporated into water vapor, providing pretreatment for subsequent condensation work; the support plate 6 not only supports the heating coil 5, but also helps guide the gas flow to ensure that the gas can evenly contact the heating surface.

[0022] As a preferred technical solution of the present invention, the condensation component includes a condenser 8, an isolation plate 10, a heat absorbing plate 12, an air guide plate 13, a baffle 27, a drain pipe 16 and a drain valve 17. The condenser 8 is fixedly connected to the top of the heater 4, and an air guide pipe 31 is opened between the heater 4 and the condenser 8. The isolation plate 10 is fixedly connected to the inside of the condenser 8, an air inlet groove 9 is arranged below the isolation plate 10, the air inlet groove 9 is connected to the air guide pipe 31, and an air guide groove 11 is arranged on the top of the air inlet groove 9. A baffle 27 corresponding to the position of the air guide groove 11 is fixedly connected to the inside of the condenser 8, a plurality of heat absorbing plates 12 are fixedly connected to the surface of the isolation plate 10, and an air guide plate 13 is fixedly connected to the top of the heat absorbing plate 12. A water collecting tank 14 is opened on the side of the condenser 8 away from the air inlet tank 9, a drain pipe 16 connected to the water collecting tank 14 is fixedly connected to the bottom of the condenser 8, and a drain valve 17 is fixedly connected to the middle of the drain pipe 16.

[0023] Specifically, the heated C4 gas will enter the air inlet groove 9 through the drain pipe 16, and then enter the gap between the heat absorbing plate 12 along the air guide groove 11 and the baffle 27, and move along the heat absorbing plate 12. In this process, heat exchange will occur between the heat absorbing plate 12 and the C4 gas, so that the temperature of the C4 gas will drop below 100 degrees Celsius. At this time, the water vapor in the C4 gas will condense on the inner wall of the heat absorbing plate 12, and slide along the surface of the isolation plate 10 into the water collecting tank 14. The drain valve 17 is opened regularly to discharge the condensed water in the water collecting tank 14 through the drain pipe 16; after the C4 gas is condensed, it will flow from the top of the water collecting tank 14 along the surface of the air guide plate 13. The water vapor in the C4 gas is effectively condensed into liquid water and discharged from the system through the heat exchange between the heat absorbing plate 12 and the gas, which significantly reduces the moisture content in the gas. The moisture in the C4 gas is removed by condensation before the molecular sieve 32, thereby reducing the amount of moisture entering the molecular sieve 32 and the adsorption pressure of the molecular sieve 32. The service life of the molecular sieve 32 is increased, the regeneration frequency and maintenance cost of the molecular sieve 32 are reduced, and the moisture removal effect is also improved. The baffle 27 and the air guide plate 13 function to change the gas flow direction and increase the contact time between the gas and the heat absorbing plate 12, thereby improving the condensation effect.

[0024] As a preferred technical solution of the present invention, the cooling assembly includes a condenser 18 and a cooling pipe 19. The condenser 8 is fixedly connected to the top of the condenser 8. The outer wall of the condenser 18 is sheathed with the cooling pipe 19, and the cooling pipe 19 is connected to an external water source.

[0025] Specifically, the condensed C4 gas will enter the condenser 18, and the cooling water flowing in the cooling pipe 19 will cool the C4 gas, thereby preventing the high-temperature C4 gas from directly entering the adsorber 2. High temperature will affect the adsorption performance of the molecular sieve 32, resulting in a decrease in adsorption efficiency. Through cooling treatment, it is ensured that the C4 gas is in a suitable low-temperature state when entering the adsorber 2, thereby maintaining the best adsorption effect of the molecular sieve 32; the cooling water exchanges heat with the C4 gas in the condenser 18 through the cooling pipe 19, further reducing the gas temperature, so that the remaining trace water vapor can be completely condensed into liquid water and discharged, ensuring that the gas entering the adsorber 2 is drier.

[0026] As a preferred technical solution of the present invention, a lower valve 20 is fixedly connected between the top of the condenser 18 and the bottom of the adsorber 2 , and an upper valve 21 is fixedly connected between the top of the adsorber 2 and the outlet pipe 3 .

[0027] Specifically, after long-term use, the molecular sieve 32 can be regenerated and replaced by closing the upper valve 21 and the lower valve 20 to ensure that it is in the best adsorption state.

[0028] As a preferred technical solution of the present invention, the regeneration component includes an exhaust pipe 22, an exhaust valve 23, an intake pipe 24 and an intake valve 25. The exhaust pipe 22 is fixedly connected to the bottom outer wall of the adsorber 2, the exhaust valve 23 is fixedly connected to the middle of the exhaust pipe 22, the intake pipe 24 is fixedly connected to the top outer wall of the adsorber 2, the intake valve 25 is fixedly connected to the middle of the intake pipe 24, and the intake pipe 24 and the exhaust pipe 22 are centrally symmetrically arranged.

[0029] Specifically, when the molecular sieve 32 is regenerated, the upper valve 21 and the lower valve 20 are closed, the air inlet valve 25 and the air exhaust valve 23 are opened, and then a high-temperature dry gas (such as high-temperature nitrogen or other inert gas) is introduced into the air inlet pipe 24. The high-temperature dry gas enters from the top of the adsorber 2 and flows downward along the molecular sieve 32. In the process, the water and other impurities adsorbed thereon are taken away and discharged through the exhaust pipe 22, thereby achieving the regeneration of the molecular sieve 32 and ensuring that it is always in the best adsorption state.

[0030] As a preferred technical solution of the present invention, the heating coil 5 includes a plurality of meander coils 28 and a plurality of circular coils 29 . The meander coils 28 are placed longitudinally to form a circle, and the circular coils 29 are placed transversely and fixedly connected to the outer edge of the meander coils 28 .

[0031] Specifically, the combination of the toroidal coil 28 and the circular coil 29 significantly improves the heating efficiency, ensures that the gas can be heated up quickly and evenly, reduces the heating time, and through the multi-layer, multi-directional heating network design, ensures that the temperature distribution in the heating chamber 30 is more uniform, avoids the occurrence of local overheating or underheating, and improves the heating effect and system stability.

[0032] As a preferred technical solution of the present invention, a plurality of longitudinally arranged water diversion grooves 15 are provided on both sides of the outer wall of the heat absorbing plate 12 .

[0033] Specifically, the water inlet groove 15 can increase the contact area between the C4 gas and the heat absorbing plate 12. The C4 gas will also be affected by more turbulence when flowing through the heat absorbing plate 12, thereby enhancing the convective heat exchange effect and improving the heat transfer efficiency. At the same time, the design of the water inlet groove 15 can effectively guide the flow of condensed water, prevent the condensed water from forming droplets on the surface of the heat absorbing plate 12 and being carried forward by the high-speed flowing C4 gas, thereby ensuring the dryness of the C4 gas.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A C4 water scrubber, comprising a water scrubber body (1), characterized in that: The top of the water washing tower body (1) is connected to an adsorber (2), the top of the adsorber (2) is connected to an air outlet pipe (3), an adsorption chamber (26) is provided inside the adsorber (2), a molecular sieve (32) is fixedly connected inside the adsorption chamber (26), a heating component, a condensing component and a cooling component are sequentially connected between the adsorber (2) and the water washing tower body (1) from bottom to top, and a regeneration component is connected to the outer wall of the adsorber (2).

2. A C4 water scrubber according to claim 1, characterized in that: The heating assembly comprises a heater (4), a heating coil (5), a support plate (6) and a controller (7); the bottom of the heater (4) is fixedly connected to the top of the water washing tower body (1); a heating chamber (30) is provided inside the heater (4); a heating coil (5) is installed in the heating chamber (30); a plurality of support plates (6) corresponding to the positions of the heating coils (5) are fixedly connected to the inner wall of the heating chamber (30); the outer wall of the heater (4) is fixedly connected to the controller (7); and the controller (7) and the heating coil (5) are electrically connected.

3. A C4 water washing tower according to claim 2, characterized in that: The condensation assembly comprises a condenser (8), an isolation plate (10), a heat absorbing plate (12), an air guide plate (13), a baffle (27), a drain pipe (16) and a drain valve (17); the top of the heater (4) is fixedly connected to the condenser (8); an air guide pipe (31) is provided between the heater (4) and the condenser (8); the interior of the condenser (8) is fixedly connected to the isolation plate (10); an air inlet groove (9) is provided below the isolation plate (10); the air inlet groove (9) is connected to the air guide pipe (31); the top of the air inlet groove (9) An air guide groove (11) is provided, a baffle (27) corresponding to the position of the air guide groove (11) is fixedly connected inside the condenser (8), a plurality of heat absorbing plates (12) are fixedly connected to the surface of the isolation plate (10), an air guide plate (13) is fixedly connected to the top of the heat absorbing plate (12), a water collecting groove (14) is provided on a side of the condenser (8) away from the air inlet groove (9), a drainage pipe (16) connected to the drainage pipe (14) is fixedly connected to the bottom of the condenser (8), and a drainage valve (17) is fixedly connected to the middle of the drainage pipe (16).

4. A C4 water washing tower according to claim 3, characterized in that: The cooling assembly comprises a condenser tube (18) and a cooling pipe (19); the top of the condenser (8) is fixedly connected with the condenser tube (18); the outer wall of the condenser tube (18) is provided with a cooling pipe (19); and the cooling pipe (19) is connected to an external water source.

5. A C4 water scrubber according to claim 4, characterized in that: A lower valve (20) is fixedly connected between the top of the condenser (18) and the bottom of the adsorber (2), and an upper valve (21) is fixedly connected between the top of the adsorber (2) and the air outlet pipe (3).

6. A C4 water washing tower according to claim 5, characterized in that: The regeneration component comprises an exhaust pipe (22), an exhaust valve (23), an intake pipe (24) and an intake valve (25); the exhaust pipe (22) is fixedly connected to the bottom outer wall of the adsorber (2); the exhaust valve (23) is fixedly connected to the middle of the exhaust pipe (22); the intake pipe (24) is fixedly connected to the top outer wall of the adsorber (2); the intake valve (25) is fixedly connected to the middle of the intake pipe (24); and the intake pipe (24) and the exhaust pipe (22) are centrally symmetrically arranged.

7. A C4 water washing tower according to claim 6, characterized in that: The heating coil (5) comprises a plurality of circular coils (28) and a plurality of round coils (29); the circular coils (28) are arranged longitudinally to form a circle, and the round coils (29) are arranged transversely and fixedly connected to the outer edges of the circular coils (28).

8. A C4 water washing tower according to claim 7, characterized in that: A plurality of longitudinally arranged water guide grooves (15) are provided on both sides of the outer wall of the heat absorbing plate (12).

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