Online alkali washing device of DMTO device water system

Abstract

The utility model is suitable for the technical field of water system alkali washing, and provides an online alkali washing device of a DMTO device water system. The flow guide cover and the gas guide cover are fixed on the outer wall of one side of the alkali liquor storage box through bolts, and the flow guide cover is positioned below the gas guide cover; the lower flow dividing pipe is integrally formed on the outer side wall of the flow guide cover; the upper shunting pipe is integrally formed on the outer side wall of the gas guide cover; the flow guide pipe is fixed at one end of the lower flow dividing pipe through a flange; the air guide pipe is fixed at one end of the upper shunt pipe through a flange; the four-way joint is arranged between the flow guide pipe and the air guide pipe; the lower electromagnetic valve is fixed at the bottom of the four-way top through a screw; the heat exchange efficiency of the cold exchange equipment is improved through regular on-line alkali washing, and the frequent off-line high-pressure cleaning technology of the DMTO device cold exchange equipment is changed into on-line alkali washing, so that the heat exchange efficiency of the cold exchange equipment is improved, the operation frequency of personnel is reduced, and the economic benefits of enterprises can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of water system caustic washing, and particularly relates to an on-line caustic washing device for a water system of a DMTO device. Background Technique

[0002] The methanol-to-olefins process consists of three main parts: a reaction-regeneration system, a quench water washing and wastewater stripping system, and a waste heat recovery system. As the DMTO device operates, a large amount of catalyst fines carried by the DMTO product gas enter the quench water washing system. The product gas contacts the quench water and the washing water in a countercurrent manner, washing the catalyst carried in the product gas into the water system. This part of the catalyst deposits in the water system heat exchanger, blocking the tube bundle of the water system heat exchange equipment, resulting in a poor heat exchange effect of the heat exchanger. The water system heat exchanger has to be frequently taken out and the head is disassembled for high-pressure cleaning, causing economic losses to the enterprise.

[0003] Therefore, an on-line caustic washing device for a water system of a DMTO device is proposed. Content of the Utility Model

[0004] The utility model provides an on-line caustic washing device for a water system of a DMTO device, aiming to solve the above problems.

[0005] The utility model is realized as follows. An on-line caustic washing device for a water system of a DMTO device includes: a caustic solution storage tank; a diversion cover and a gas guide cover fixed to the outer wall of one side of the caustic solution storage tank by bolts, the diversion cover being located below the gas guide cover; a lower shunt pipe integrally formed on the outer side wall of the diversion cover; an upper shunt pipe integrally formed on the outer side wall of the gas guide cover; a diversion pipe fixed to one end of the lower shunt pipe by a flange; a gas pipe fixed to one end of the upper shunt pipe by a flange; a four-way joint located between the diversion pipe and the gas pipe; a lower solenoid valve fixed to the top and bottom of the four-way joint by screws; and an upper solenoid valve fixed to the top of the four-way joint by screws; a first docking pipe fixed to the outer wall of one side of the four-way joint by screws; and a side solenoid valve fixed to the outer wall of the other side of the four-way joint by screws; a second docking pipe fixed to the outer side wall of the side solenoid valve by screws; an air pump and a liquid extraction pump fixed to the outer wall of the caustic solution storage tank adjacent to the side of the diversion cover by bolts, the air pump being located above the liquid extraction pump; a connecting pipe fixed between the liquid extraction pump and the diversion cover; and a liquid extraction pipe fixed between the liquid extraction pump and the caustic solution storage tank; a caustic solution injection pipe embedded in the top of the caustic solution storage tank; and a controller fixed to the outer wall of the caustic solution storage tank near the side of the air pump by bolts.

[0006] Preferably, the output end of the air pump and the upper shunt pipe are both communicated with the gas guide cover, and the lower shunt pipe and the connecting pipe are both communicated with the diversion cover.

[0007] Preferably, the lower electromagnetic valve and the diversion pipe are fixedly connected by bolts, and the upper electromagnetic valve and the air guide pipe are fixedly connected by bolts.

[0008] Preferably, the lower electromagnetic valve, the upper electromagnetic valve, the first docking pipe and the side electromagnetic valve are all connected to the four-way joint, and the second docking pipe is connected to the side electromagnetic valve.

[0009] Preferably, one end of the liquid extraction pipe is located inside the alkali solution storage tank, and there is a gap between the bottom end of the liquid extraction pipe and the inner bottom of the alkali solution storage tank.

[0010] Preferably, the alkali solution storage tank is filled with an alkali solution, which is composed of a mixture of sodium hydroxide and ethanol.

[0011] Preferably, the alkali solution storage tank, the diversion cover and the air guide cover are all of a hollow cuboid structure.

[0012] Preferably, the lower electromagnetic valve, the upper electromagnetic valve, the side electromagnetic valve, the air pump and the liquid extraction pump are all electrically connected to the controller.

[0013] Compared with the prior art, the embodiments of the present application mainly have the following beneficial effects:

[0014] By using air pressure to push out the cooling water in the tube bundle of the heat exchanger of the DMTO device, on the one hand, it avoids the reaction between the cooling water and the alkali solution to generate heat and cause the equipment to heat up, and on the other hand, it avoids the pollution of the cooling water and affects the subsequent heat and cold exchange rate. By regularly performing online alkali washing to improve the heat exchange efficiency of the heat exchanger, the frequent offline high-pressure cleaning technology of the heat exchanger of the DMTO device is changed to online alkali washing, which not only improves the heat exchange efficiency of the heat exchanger and reduces the frequency of personnel operations, but also improves the economic benefits of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the present utility model;

[0016] Figure 2 is a schematic diagram of the internal structure of the alkali solution storage tank of the present utility model;

[0017] Figure 3 is a schematic diagram of the four-way joint structure of the present utility model;

[0018] Figure 4 is a schematic diagram of the internal structure of the diversion cover of the present utility model.

[0019] In the figure: 1. caustic solution storage tank; 2. flow guide cover; 3. air guide cover; 4. lower shunt pipe; 5. upper shunt pipe; 6. flow guide pipe; 7. air guide pipe; 8. four-way joint; 9. lower solenoid valve; 10. upper solenoid valve; 11. first docking pipe; 12. side solenoid valve; 13. second docking pipe; 14. air pump; 15. liquid extraction pump; 16. connecting pipe; 17. liquid extraction pipe; 18. caustic solution injection pipe; 19. controller. Detailed implementation manners

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order.

[0021] Referring to "embodiments" herein means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears at various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0022] An embodiment of the present utility model provides an on-line caustic washing device for the water system of a DMTO device, as Figures 1-4As shown in the figure, it includes an alkali solution storage tank 1. On the outer wall of one side of the alkali solution storage tank 1, a diversion hood 2 and a gas guide hood 3 are fixedly connected by bolts. The diversion hood 2 is located below the gas guide hood 3. The alkali solution storage tank 1, the diversion hood 2, and the gas guide hood 3 are all hollow cuboid structures. On the outer wall of the diversion hood 2 away from the alkali solution storage tank 1, a lower shunt pipe 4 is integrally formed. On the outer wall of the gas guide hood 3 away from the alkali solution storage tank 1, an upper shunt pipe 5 is integrally formed. One end of the lower shunt pipe 4 away from the diversion hood 2 is fixedly connected to a diversion pipe 6 by a flange. One end of the upper shunt pipe 5 away from the gas guide hood 3 is fixedly connected to a gas guide pipe 7 by a flange. One end of the diversion pipe 6 is fixedly connected to a lower solenoid valve 9. One end of the gas guide pipe 7 is fixedly connected to an upper solenoid valve 10. The lower solenoid valve 9 and the diversion pipe 6 are fixedly connected by bolts. The upper solenoid valve 10 and the gas guide pipe 7 are fixedly connected by bolts. The upper solenoid valve 10 and the lower solenoid valve 9 are fixedly connected by bolts to a four-way joint 8. On the outer wall of one side of the four-way joint 8, a first docking pipe 11 is fixedly connected by screws. And on the outer wall of the other side of the four-way joint 8, a side solenoid valve 12 is fixedly connected by screws. On the outer wall of one side of the side solenoid valve 12, a second docking pipe 13 is fixedly connected by screws. The lower solenoid valve 9, the upper solenoid valve 10, the first docking pipe 11, and the side solenoid valve 12 are all connected to the four-way joint 8. The second docking pipe 13 is connected to the side solenoid valve 12. On the outer wall of the side of the alkali solution storage tank 1 adjacent to the diversion hood 2, an air pump 14 and a liquid extraction pump 15 are fixedly connected by bolts. The air pump 14 is located above the liquid extraction pump 15. And between the output end of the air pump 14 and the outer wall of the gas guide hood 3, they are fixedly connected by bolts. Between the output end of the liquid extraction pump 15 and the outer wall of the diversion hood 2, a connecting pipe 16 is fixedly connected by bolts. The output end of the air pump 14 and the upper shunt pipe 5 are both connected to the gas guide hood 3. The lower shunt pipe 4 and the connecting pipe 16 are both connected to the diversion hood 2. The input end of the liquid extraction pump 15 is fixedly connected to a liquid extraction pipe 17. On the top of the alkali solution storage tank 1, an alkali solution injection pipe 18 is embedded. On the outer wall of one side of the alkali solution storage tank 1, at a position close to the air pump 14, a controller 19 is fixedly connected by bolts. The lower solenoid valve 9, the upper solenoid valve 10, the side solenoid valve 12, the air pump 14, and the liquid extraction pump 15 are all electrically connected to the controller 19.

[0023] It should be noted that since a large amount of catalyst fines in the existing DMTO product gas enter the quench water washing system, this part of the catalyst deposits in the heat exchangers of the water system, blocking the tubes of the heat exchange equipment in the water system, resulting in a deterioration of the heat exchange effect of the heat exchanger. The heat exchanger in the water system has to be frequently taken out of service and the head end removed for high-pressure cleaning, causing economic losses to the enterprise. In this embodiment, the cooling water in the tubes of the heat exchange equipment of the DMTO device is pushed out by using air pressure. On the one hand, it avoids the reaction between the cooling water and the caustic solution to generate heat and cause the equipment temperature to rise. On the other hand, it avoids the pollution of the cooling water and affects the subsequent heat and cold exchange rate. By regularly performing online caustic cleaning to improve the heat exchange efficiency of the heat exchange equipment, the frequent offline high-pressure cleaning of the heat exchange equipment of the DMTO device is modified to online caustic cleaning, which not only improves the heat exchange efficiency of the heat exchange equipment and reduces the frequency of personnel operations, but also improves the economic benefits of the enterprise.

[0024] Specifically, in this embodiment, the solution mainly includes a caustic solution storage tank 1, a diversion cover 2, a gas guide cover 3, and a four-way joint 8. When in use, the first docking pipe 11 is fixedly docked with the heat exchange equipment of the DMTO device, and the cooling water inlet pipe entering the heat exchange equipment is fixedly docked with the second docking pipe 13. The caustic solution is injected into the caustic solution storage tank 1 through the caustic solution injection pipe 18. When performing online caustic cleaning operations, the controller 19 controls the side solenoid valve 12 to close, the upper solenoid valve 10 to open, and the lower solenoid valve 9 to close. The air pump 14 pumps air into the gas guide cover 3 in sequence. Under the diversion of the gas guide cover 3, the air sequentially passes through the upper diversion pipe 5, the gas guide pipe 7, and the upper solenoid valve 10 and then enters the four-way joint 8, and finally enters the tubes in the heat exchange equipment of the DMTO device through the first docking pipe 11, using air pressure to push out the residual cooling water in the heat exchange equipment. Then, the controller 19 controls the side solenoid valve 12 to close, the upper solenoid valve 10 to close, and the lower solenoid valve 9 to open. At this time, the liquid extraction pump 15 pumps the caustic solution in the caustic solution storage tank 1 through the liquid extraction pipe 17, the connecting pipe 16, the diversion cover 2, the lower diversion pipe 4, the diversion pipe 6, the lower solenoid valve 9, the four-way joint 8, and the first docking pipe 11 and then enters the tubes in the heat exchange equipment of the DMTO device, using the caustic solution to soften and clean the catalyst in the tubes, completing the online caustic cleaning.

[0025] In a further preferred embodiment of the present utility model, as Figure 2 shown, one end of the liquid extraction pipe 17 is located inside the caustic solution storage tank 1, and there is a gap between the bottom end of the liquid extraction pipe 17 and the inner bottom of the caustic solution storage tank 1.

[0026] In this embodiment, the caustic solution in the caustic solution storage tank 1 can be effectively extracted through the liquid extraction pipe 17.

[0027] In a further preferred embodiment of the present utility model, as Figure 1 shown, the inside of the caustic solution storage tank 1 is filled with a caustic solution, which is composed of a mixture of sodium hydroxide and ethanol.

[0028] In this embodiment, the lye formed by mixing sodium hydroxide and ethanol can ensure the effect of cleaning the catalyst.

[0029] It should be noted that for the foregoing embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present utility model is not limited by the described action sequence, because according to the present utility model, certain steps may be adopted in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present utility model.

[0030] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the above division of units can be implemented in other ways in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection between devices or units can be in the form of telecommunications or other forms.

[0031] The units described above as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place, or they can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0032] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit the protection scope of the utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still, without conflict, make combinations, additions, deletions or other adjustments to the features in the embodiments of the present utility model according to the situation without creative work, so as to obtain different technical solutions that essentially do not deviate from the concept of the present utility model. These technical solutions also fall within the scope of protection of the present utility model.

Claims

1. An online caustic washing device for the water system of a DMTO unit, characterized in that, Including: An alkali solution storage tank (1); A flow guide cover (2) and a gas guide cover (3) fixed to an outer wall on one side of the alkali solution storage tank (1) by bolts, and the flow guide cover (2) is located below the gas guide cover (3); A lower shunt pipe (4) integrally formed on an outer wall of the flow guide cover (2); An upper shunt pipe (5) integrally formed on an outer wall of the gas guide cover (3); A flow guide pipe (6) fixed to one end of the lower shunt pipe (4) by a flange; A gas guide pipe (7) fixed to one end of the upper shunt pipe (5) by a flange; A four-way joint (8) provided at a position between the flow guide pipe (6) and the gas guide pipe (7); A lower solenoid valve (9) fixed to the top and bottom of the four-way joint (8) by screws; and An upper solenoid valve (10) fixed to the top of the four-way joint (8) by screws; A first docking pipe (11) fixed to an outer wall on one side of the four-way joint (8) by screws; and A side solenoid valve (12) fixed to an outer wall on the other side of the four-way joint (8) by screws; A second docking pipe (13) fixed to an outer wall of the side solenoid valve (12) by screws; An air pump (14) and a liquid extraction pump (15) fixed to an outer wall of the alkali solution storage tank (1) adjacent to the flow guide cover (2) by bolts, and the air pump (14) is located above the liquid extraction pump (15); A connecting pipe (16) fixed between the liquid extraction pump (15) and the flow guide cover (2); and A liquid extraction pipe (17) fixed between the liquid extraction pump (15) and the alkali solution storage tank (1); An alkali solution injection pipe (18) embedded in the top of the alkali solution storage tank (1); and A controller (19) fixed to a position on an outer wall of the alkali solution storage tank (1) close to one side of the air pump (14) by bolts.

2. The on-line caustic washing device for the water system of a DMTO device according to claim 1, wherein An output end of the air pump (14) and the upper shunt pipe (5) are both communicated with the gas guide cover (3), and the lower shunt pipe (4) and the connecting pipe (16) are both communicated with the flow guide cover (2).

3. The online caustic washing device for the water system of a DMTO device according to claim 1, characterized in that, The lower solenoid valve (9) and the flow guide pipe (6) are fixedly connected by bolts, and the upper solenoid valve (10) and the gas guide pipe (7) are fixedly connected by bolts.

4. The online caustic washing device for the water system of a DMTO device as described in claim 1, wherein, The lower solenoid valve (9), the upper solenoid valve (10), the first docking pipe (11) and the side solenoid valve (12) are all communicated with the four-way joint (8), and the second docking pipe (13) is communicated with the side solenoid valve (12).

5. The on-line caustic washing device for the water system of a DMTO device as described in claim 1, wherein One end of the liquid extraction pipe (17) is located inside the alkali solution storage tank (1), and there is a gap between the bottom end of the liquid extraction pipe (17) and the inner bottom of the alkali solution storage tank (1).

6. The on-line caustic washing device for the water system of a DMTO device according to claim 1, characterized in that, The inside of the alkali solution storage tank (1) is filled with an alkali solution, and the alkali solution is composed of a mixture of sodium hydroxide and ethanol.

7. The online caustic washing device for the water system of a DMTO device according to claim 1, wherein The alkali solution storage tank (1), the flow guide cover (2) and the gas guide cover (3) are all of a hollow cuboid structure.

8. The on-line caustic washing device for the water system of a DMTO device as claimed in claim 1, characterized in that, The lower solenoid valve (9), the upper solenoid valve (10), the side solenoid valve (12), the air pump (14) and the liquid extraction pump (15) are all electrically connected to the controller (19).

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