Novel shunt cooler

Abstract

The utility model discloses a novel split-flow cooler, which belongs to the technical field of heat exchange equipment and comprises a shell, two ends of the shell are provided with end sockets, two ends of each end socket are respectively provided with an inlet pipe connecting flange and an outlet pipe connecting flange, the shell is further provided with a shell side inlet flange and a shell side outlet flange, and a group of heat exchange pipes are arranged in the shell. The heat exchange tubes are installed between the tube plates, a plurality of baffle plates are arranged in the middle of the shell and used for changing the flow direction of liquid, the shell side inlet flange is connected with a flow dividing disc a, the flow dividing disc a is used for liquid flow dividing, and flow dividing holes a are formed in the flow dividing disc a. The heat exchanger solves the technical problem that existing equipment is poor in shunting and is mainly applied to heat exchange equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of EO / EG production, in particular to a novel split flow cooler. Background Art

[0002] At present, there are three main methods for producing ethylene oxide (EO) / ethylene glycol using ethylene as raw material in the world: oxygen oxidation method, air oxidation method and chlorohydrin method. Large-scale EO / ethylene glycol plants almost all adopt the ethylene direct oxidation method, that is, the process route of using pure oxygen and ethylene as raw materials to directly react on a silver catalyst, oxidizing to generate EO, and hydrating EO to generate EG.

[0003] The primary product heat exchanger is a vertical fixed tube sheet heat exchanger, which mainly exchanges heat with the outlet product gas of the ethylene oxide reactor through boiler water to generate medium-pressure steam. As one of the important equipment in this production process, the primary product heat exchanger has a higher production capacity than previous equipment and has high requirements for the manufacturing process. It is generally imported or produced by well-known domestic equipment manufacturers with manufacturing experience. At present, the conventional design and material selection of primary product coolers have repeatedly caused heat exchange tube leakage, which has affected the production load and process operation of the equipment.

[0004] The heat exchange tube material of the existing primary product cooler split design is generally S31603, and the expansion joint material of the equipment body is Q345R. It has a weak ability to cope with the tail burning of the EO reactor and the rapid expansion of the system temperature and pressure. The heat exchange tube is easily damaged by high temperature and high pressure, causing leakage of the heat exchange tube and failure of the equipment function.

[0005] According to the current operating status of the domestic EOEG device, combined with the leakage location of the heat exchange tube, it is found that the leakage location is mainly concentrated in the upper part of the expansion joint of the lower tube plate, where the tube wall is thinned due to the expansion. Because the design temperature of the expansion joint is 210℃ and it is different from the material of the heat exchange tube, the expansion rate is different. When the tail burning occurs, the expansion of the shell shell and the expansion of the tube heat exchange tube are inconsistent, resulting in the failure of the heat exchange tube at the weak expansion joint. At the same time, after the tail burning of the EO reactor occurs, a large amount of steam is generated after the heat exchange of the boiler water in the shell side of the primary product cooler, causing the downstream medium-pressure drum safety valve to start and release pressure. The pressure drop causes the high-temperature water in the shell side to vaporize, generating vibration and impact, which is also one of the reasons for the leakage of the heat exchange tube. In addition, the number of support plates designed for this heat exchanger is 4, and the plate spacing is 1275mm, which is relatively large, and the anti-impact effect is not good. In addition, because the shell side fluid has a fast flow rate near the center of the heat exchanger and a low flow rate on both sides of the cylinder, this design will cause uneven overall heat exchange, which will have an adverse effect on stable production. Utility Model Content

[0006] In order to solve the technical problems in the background technology, the utility model provides a new type of split flow cooler, and the technical solution adopted is as follows:

[0007] A novel split flow cooler comprises a shell, with heads arranged at both ends of the shell, an inlet pipe flange and an outlet pipe flange respectively arranged at both ends of the head, a shell side inlet flange and a shell side outlet flange are also arranged on the shell, a group of heat exchange tubes are arranged inside the shell, and the heat exchange tubes are installed between the tube sheets. The above structure belongs to the prior art and the applicant will not repeat it here.

[0008] The core improvements of this utility model are as follows:

[0009] The number of heat exchange tubes has been optimized from 4,237 per unit to 3,945, a reduction of 292.

[0010] Taking into account the impact vibration of water vaporization in the shell-side boiler on the heat exchange tubes during the heat exchange process, the number of heat exchanger support plates was increased from 4 to 8, and the plate spacing was reduced from 1275mm to 850mm.

[0011] A number of baffles are arranged in the middle of the shell, and the baffles are used to change the flow direction of the liquid, thereby ensuring more uniform heat exchange and improving the stability of the equipment during use.

[0012] In order to achieve the anti-impact effect, the shell side inlet flange is connected to the diverter plate a, which is used for liquid diversion. The diverter plate a is provided with a diverter hole a. The original design was an anti-impact baffle. The shell side fluid has a fast flow rate near the center of the heat exchanger, and a low flow rate on both sides of the cylinder, resulting in uneven overall heat exchange. The new design adds a diverter to the shell side inlet, and the fluid enters the heat exchanger from all around the diverter, so that the boiler water flows relatively evenly.

[0013] In order to meet the process requirements, an expansion joint is also provided on the shell.

[0014] In order to achieve a better anti-impact effect, the diverter plate a is connected to the diverter plate b, a group of diverter holes b are provided on the diverter plate b, and the diameter of the diverter plate b is greater than the diameter of the diverter plate a.

[0015] In order to achieve the effect of filtering impurities, a filter screen is provided in the shell side inlet flange, and a pull ring is provided in the filter screen, and the pull ring is used to pull out the filter screen.

[0016] The utility model has the following advantages:

[0017] Through the transformation of the utility model technology, it can greatly cope with the operation of extreme working conditions such as tail burning of EO reactor, and greatly enhance the impact resistance. The actual service life of the equipment is extended from three years to more than fifteen years, which improves the stability and economy of the device operation. At the same time, the safety of the equipment is also greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the internal structure diagram of the utility model;

[0019] Figure 2 This is a structural diagram of the diverter plate a of the utility model;

[0020] Figure 3 This is a combined structural diagram of the diverter plate a and the diverter plate b of the utility model;

[0021] Figure 4 It is a structural diagram of the filter screen of the present utility model.

[0022] In the figure: 1. outlet pipe flange, 2. head, 3. tube sheet, 4. heat exchange tube, 5. baffle, 6. expansion joint, 7. inlet pipe flange, 8. shell side outlet flange, 9. shell side inlet flange, 10. diverter plate a, 10-1 diverter hole a, 11 diverter plate b, 11-1 diverter hole b. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0024] Example 1

[0025] like Figure 1-Figure 3 Shown

[0026] A novel split flow cooler comprises a shell, a head 2 is arranged at both ends of the shell, an inlet pipe flange 7 and an outlet pipe flange 1 are arranged at both ends of the head 2, a shell side inlet flange 9 and a shell side outlet flange 8 are also arranged on the shell, a group of heat exchange tubes 4 are arranged inside the shell, and the heat exchange tubes 4 are installed between tube sheets 3, and the characteristics are as follows:

[0027] A plurality of baffles 5 are arranged in the middle of the shell, and the baffles 5 are used to change the flow direction of the liquid;

[0028] The shell side inlet flange 9 is connected to the diverter plate a10, which is used for liquid diversion. The diverter plate a10 is provided with diverter holes a10-1, and the shell is also provided with an expansion joint 6.

[0029] The working principle of the utility model is as follows:

[0030] By letting fluid a enter from the inlet flange, fluid a flows out from the outlet flange 1.

[0031] Fluid b enters from the shell side inlet flange, is diverted by the diverter plate a10, and contacts the heat exchange tube 4, and then is diverted by the baffle plate 5 and flows out from the shell side outlet flange 8, forming heat exchange between fluid a and fluid b.

[0032] Example 2

[0033] like Figure 1-Figure 4 Shown

[0034] A novel split flow cooler comprises a shell, a head 2 is arranged at both ends of the shell, an inlet pipe flange 7 and an outlet pipe flange 1 are arranged at both ends of the head 2, a shell side inlet flange 9 and a shell side outlet flange 8 are also arranged on the shell, a group of heat exchange tubes 4 are arranged inside the shell, and the heat exchange tubes 4 are installed between tube sheets 3, and the characteristics are as follows:

[0035] A plurality of baffles 5 are arranged in the middle of the shell, and the baffles 5 are used to change the flow direction of the liquid;

[0036] The shell side inlet flange 9 is connected to the diverter plate a10, which is used for liquid diversion. The diverter plate a10 is provided with a diverter hole a10-1. The shell is also provided with an expansion joint 6.

[0037] The diverter plate a10 is connected to the diverter plate b11, which is provided with a group of diverter holes b11-1. The diameter of the diverter plate b11 is larger than the diameter of the diverter plate a10. A filter screen 12 is provided in the shell side inlet flange 9, and a pull ring 12-1 is provided in the filter screen 12. The pull ring 12-1 is used to pull out the filter screen 12.

[0038] The working principle of the utility model is as follows:

[0039] By letting fluid a enter from the inlet flange, fluid a flows out from the outlet flange 1.

[0040] Fluid b enters from the shell side inlet flange, is filtered by the filter screen 12, is diverted by the diverter plate a10 and the diverter plate b11, contacts the heat exchange tube 4, and then is diverted by the baffle plate 5 and flows out from the shell side outlet flange 8, forming heat exchange between fluid a and fluid b.

Claims

1. A novel split flow cooler comprises a shell, a head (2) is arranged at both ends of the shell, an inlet pipe flange (7) and an outlet pipe flange (1) are arranged at both ends of the head (2), the shell is also provided with a shell side inlet flange (9) and a shell side outlet flange (8), a group of heat exchange tubes (4) are arranged inside the shell, the heat exchange tubes (4) are installed between tube sheets (3), a plurality of baffles (5) are arranged in the middle of the shell, the baffles (5) are used to change the flow direction of the liquid, and the characteristics are: The number of heat exchange tubes is 3945; The number of heat exchanger support plates is 8, and the plate spacing is 850mm; The shell side inlet flange (9) is connected to a diverter plate a (10), the diverter plate a (10) is used for liquid diversion, a diverter hole a (10-1) is provided on the diverter plate a (10), and an expansion joint (6) is also provided on the shell.

2. A novel split flow cooler as claimed in claim 1, characterized in that: The diverter plate a (10) is connected to the diverter plate b (11), and the diverter plate b (11) is provided with a group of diverter holes b (11-1), and the diameter of the diverter plate b (11) is larger than the diameter of the diverter plate a (10); A filter screen (12) is provided in the shell-side inlet flange (9), and a pull ring (12-1) is provided in the filter screen (12). The pull ring (12-1) is used to pull out the filter screen (12).

Images