Device for improving heat exchange efficiency of feeding preheater of C4 reaction unit

Abstract

The utility model relates to a device for improving the heat exchange efficiency of a feeding preheater of a C4 reaction unit. According to the technical scheme, an outlet of a feeding C4 filter is connected to a shell pass inlet of a catalytic distillation tower top cooler, a shell pass outlet is connected to a tube pass inlet of a reaction efficient heat exchanger, a tube pass outlet is connected to an inlet of an isomerization heating furnace, and an outlet is connected to an inlet of an isomerization reactor; the outlet is connected to a shell pass inlet of the efficient reaction heat exchanger through a pipeline, and a shell pass outlet of the efficient reaction heat exchanger is connected to a shell pass inlet of the reactor discharging heat exchanger through a pipeline. The device has the beneficial effects that the reaction product material at the outlet of the isomerization reactor is sent to the shell pass of the high-efficiency reaction heat exchanger for heat exchange with the feeding raw material, and the reaction product cooled by the high-efficiency reaction heat exchanger is sent to the reactor discharging heat exchanger for continuous circulating heat exchange and cooling operation, so that the heat is recycled; the inlet temperature of the isomerization heating furnace is increased, and the production and operation cost is reduced.

Description

Technical Field

[0001] The utility model relates to a C4 raw material refining device, in particular to a device for improving the heat exchange efficiency of a feed preheater of a C4 reaction unit. Background Art

[0002] As a key petroleum resource, C4 liquefied gas plays an increasingly important role in chemical production. Comprehensive utilization pathways for C4 are also expanding. The synthesis of methyl tert-butyl ether (MTBE) from isobutylene, a C4 hydrocarbon, with methanol is currently the primary C4 utilization method in China. The primary purpose of the isomerization unit in a C4 plant is to convert n-butene in the feedstock into isobutylene. The n-butene isomerization reaction is slightly exothermic, with an optimal reaction temperature range of 260-400°C. To meet the isomerization temperature requirements, the C4 feedstock must be heated. Currently, C4 plants utilize a cylindrical isomerization furnace (H-6301) with convection, fueled by self-produced non-condensable gas, to heat the feedstock to the reactor's normal reaction temperature. Directly feeding the ambient temperature liquid C4 feedstock into the furnace results in high fuel gas usage and significantly increases olefin losses in the fuel gas. This not only increases the plant's operating costs but also potentially impacts the normal operation of the distillation column, posing a risk to product quality. Utility Model Content

[0003] The purpose of this utility model is to address the above-mentioned defects in the prior art and to provide a device for improving the heat exchange efficiency of the feed preheater of the C4 reaction unit. The raw C4 is preheated and heated multiple times to increase the inlet temperature of the isomerization heating furnace, reduce the fuel gas consumption of the isomerization heating furnace, and reduce the production and operation costs.

[0004] The utility model discloses a device for improving the heat exchange efficiency of a feed preheater of a C4 reaction unit, and the technical solution thereof is as follows: comprising a feed C4 filter (SR-6301), a high-efficiency reaction heat exchanger (E-6308), a catalytic distillation tower top cooler (E-6406), an isomerization heating furnace (H-6301), an isomerization reactor (R-6301), a reactor discharge heat exchanger (E-6301), and a centrifugal compressor front liquid separator (D-6301), wherein the outlet of the feed C4 filter (SR-6301) is connected to the shell side inlet of the catalytic distillation tower top cooler (E-6406) through a pipeline, and the shell side outlet of the catalytic distillation tower fixed cooler (E-6406) is connected to the shell side inlet of the reaction high-efficiency heat exchanger (E-6406) through a pipeline. -6308), the tube-side outlet of the reaction high-efficiency heat exchanger (E-6308) is connected to the inlet of the isomerization heating furnace (H-6301) through a pipeline, the outlet of the isomerization heating furnace (H-6301) is connected to the inlet of the isomerization reactor (R-6301) through a pipeline, the outlet of the isomerization reactor (R-6301) is connected to the shell-side inlet of the reaction high-efficiency heat exchanger (E-6308) through a pipeline, the shell-side outlet of the reaction high-efficiency heat exchanger (E-6308) is connected to the shell-side inlet of the reactor discharge heat exchanger (E-6301) through a pipeline, and the shell-side outlet of the reactor discharge heat exchanger (E-6301) is connected to the liquid separation tank (D-6301) before the centrifugal compressor through a pipeline.

[0005] Preferably, the shell side outlet of the above-mentioned catalytic distillation tower fixed cooler (E-6406) is connected to the tube side inlet of the lower end of the reaction high-efficiency heat exchanger (E-6308) through a pipeline, and the tube side outlet of the upper end of the reaction high-efficiency heat exchanger (E-6308) is connected to the isomerization heating furnace (H-6301) through a pipeline.

[0006] Preferably, the tube-side outlet at the upper end of the above-mentioned high-efficiency reaction heat exchanger (E-6308) is connected to the side line inlet of the isomerization heating furnace (H-6301) through a pipeline, and the lower side outlet of the isomerization heating furnace (H-6301) is connected to the upper inlet of the isomerization reactor (R-6301) through a pipeline.

[0007] Preferably, the lower outlet of the isomerization reactor (R-6301) is connected to the shell-side inlet of the high-efficiency reaction heat exchanger (E-6308) through a pipeline and a transfer pump (P1).

[0008] Preferably, the feed C4 filter (SR-6301) is provided with more than one filter packing layer.

[0009] The beneficial effects of the present invention are as follows: the present invention sends the reaction product material at the outlet of the isomerization reactor to the shell side of the reaction high-efficiency heat exchanger for heat exchange with the feed raw material, so that the heat is recycled, and the reaction product after cooling in the reaction high-efficiency heat exchanger is sent to the reactor discharge heat exchanger to continue the cyclic heat exchange and cooling operation. In short, the present invention preheats the raw carbon four for multiple times, thereby increasing the inlet temperature of the isomerization heating furnace, reducing the fuel gas consumption of the isomerization heating furnace, and reducing the production and operation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model;

[0011] Figure 2 This is a structural diagram of embodiment 2 of the present utility model

[0012] In the above figure: feed C4 filter (SR-6301), reaction high-efficiency heat exchanger (E-6308), catalytic distillation tower top cooler (E-6406), isomerization heating furnace (H-6301), isomerization reactor (R-6301), reactor discharge heat exchanger (E-6301), centrifugal compressor front liquid separation tank (D-6301), transfer pump (P1). DETAILED DESCRIPTION

[0013] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0014] Example 1, reference Figure 1The utility model mentions a device for improving the heat exchange efficiency of the feed preheater of the C4 reaction unit, and its technical solution is: comprising a feed C4 filter (SR-6301), a high-efficiency reaction heat exchanger (E-6308), a catalytic distillation tower top cooler (E-6406), an isomerization heating furnace (H-6301), an isomerization reactor (R-6301), a reactor discharge heat exchanger (E-6301), and a centrifugal compressor front liquid separator (D-6301). The outlet of the feed C4 filter (SR-6301) is connected to the shell side inlet of the catalytic distillation tower top cooler (E-6406) through a pipeline, and the shell side outlet of the catalytic distillation tower fixed cooler (E-6406) is connected to the high-efficiency reaction heat exchanger ( The tube-side inlet of the high-efficiency reaction heat exchanger (E-6308) is connected to the tube-side outlet of the reaction high-efficiency heat exchanger (E-6308) through a pipeline, the tube-side outlet of the reaction high-efficiency heat exchanger (E-6308) is connected to the inlet of the isomerization heating furnace (H-6301) through a pipeline, the outlet of the isomerization heating furnace (H-6301) is connected to the inlet of the isomerization reactor (R-6301) through a pipeline, the outlet of the isomerization reactor (R-6301) is connected to the shell-side inlet of the high-efficiency reaction heat exchanger (E-6308) through a pipeline, the shell-side outlet of the high-efficiency reaction heat exchanger (E-6308) is connected to the shell-side inlet of the reactor discharge heat exchanger (E-6301) through a pipeline, and the shell-side outlet of the reactor discharge heat exchanger (E-6301) is connected to the liquid separation tank (D-6301) before the centrifugal compressor through a pipeline.

[0015] The shell side outlet of the above-mentioned catalytic distillation tower fixed cooler (E-6406) is connected to the tube side inlet of the lower end of the reaction high-efficiency heat exchanger (E-6308) through a pipeline, and the tube side outlet of the upper end of the reaction high-efficiency heat exchanger (E-6308) is connected to the isomerization heating furnace (H-6301) through a pipeline.

[0016] The tube side outlet at the upper end of the above-mentioned high-efficiency reaction heat exchanger (E-6308) is connected to the side line inlet of the isomerization heating furnace (H-6301) through a pipeline, and the lower side outlet of the isomerization heating furnace (H-6301) is connected to the upper end inlet of the isomerization reactor (R-6301) through a pipeline.

[0017] The feed C4 filter (SR-6301) is provided with more than one filter packing layer.

[0018] When the utility model is used, the room temperature C4 raw material after mechanical impurities are filtered by the feed C4 filter (SR-6301) is sent to the catalytic distillation tower top cooler (E-6406) by self-pressure for a preheating and heating to 60°C; the heated C4 raw material is sent to the reaction high-efficiency heat exchanger (E-6308) by self-pressure for a second heating, and after preheating and heating in the reaction high-efficiency heat exchanger (E-6308), the C4 raw material is converted into a gas phase, and the temperature after preheating reaches above 280°C. After preheating in the high-efficiency heat exchanger (E-6308), the C4 raw material is sent to the isomerization heating furnace (H-6301) for heating. After heating to 300°C, it is sent to the isomerization reactor (R-6301) for butene isomerization reaction; the reaction product material at the outlet of the isomerization reactor (R-6301) is sent to the shell side of the high-efficiency heat exchanger (E-6308) for heat exchange with the feed raw material; the reaction product after cooling in the high-efficiency heat exchanger (E-6308) is sent to the reactor discharge heat exchanger (E-6301) for heat exchange and cooling operation; the reaction product after heat exchange and cooling in the reactor discharge heat exchanger (E-6301) is sent to the centrifugal compressor front liquid separation tank (D-6301) to enter the next system; the raw C4 mentioned in the utility model is preheated and heated multiple times, thereby increasing the inlet temperature of the isomerization heating furnace and reducing the fuel gas consumption of the isomerization heating furnace.

[0019] Example 2, the utility model mentions a device for improving the heat exchange efficiency of the feed preheater of the C4 reaction unit, and its technical solution is: comprising a feed C4 filter (SR-6301), a high-efficiency reaction heat exchanger (E-6308), a catalytic distillation tower top cooler (E-6406), an isomerization heating furnace (H-6301), an isomerization reactor (R-6301), a reactor discharge heat exchanger (E-6301), and a centrifugal compressor front liquid separator (D-6301). The outlet of the feed C4 filter (SR-6301) is connected to the shell side inlet of the catalytic distillation tower top cooler (E-6406) through a pipeline, and the shell side outlet of the catalytic distillation tower fixed cooler (E-6406) is connected to the shell side inlet of the reaction high-efficiency heat exchanger through a pipeline. The tube-side inlet of the reaction high-efficiency heat exchanger (E-6308) is connected to the tube-side outlet of the reaction high-efficiency heat exchanger (E-6308) through a pipeline to the inlet of the isomerization heating furnace (H-6301), the outlet of the isomerization heating furnace (H-6301) is connected to the inlet of the isomerization reactor (R-6301) through a pipeline, the outlet of the isomerization reactor (R-6301) is connected to the shell-side inlet of the reaction high-efficiency heat exchanger (E-6308) through a pipeline, the shell-side outlet of the reaction high-efficiency heat exchanger (E-6308) is connected to the shell-side inlet of the reactor discharge heat exchanger (E-6301) through a pipeline, and the shell-side outlet of the reactor discharge heat exchanger (E-6301) is connected to the centrifugal compressor front liquid separation tank (D-6301) through a pipeline.

[0020] The difference from Example 1 is:

[0021] Reference Figure 2 The lower outlet of the isomerization reactor (R-6301) mentioned in this embodiment is connected to the shell side inlet of the high-efficiency reaction heat exchanger (E-6308) through a pipeline and a delivery pump (P1), which can increase the pressure of liquid delivery so that it can smoothly pass through the shell side of the high-efficiency reaction heat exchanger (E-6308) and the shell side of the reactor discharge heat exchanger (E-6301).

[0022] The above description is merely a preferred embodiment of the present invention. Anyone skilled in the art may utilize the above-described technical solutions to modify the present invention or create equivalent technical solutions. Therefore, any simple modifications or equivalent transformations based on the technical solutions of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A device for improving the heat exchange efficiency of a feed preheater of a C4 reaction unit, characterized by: The invention comprises a feed carbon four filter (SR-6301), a high-efficiency reaction heat exchanger (E-6308), a catalytic distillation tower top cooler (E-6406), an isomerization heating furnace (H-6301), an isomerization reactor (R-6301), a reactor discharge heat exchanger (E-6301), and a centrifugal compressor front liquid separator (D-6301). The outlet of the feed carbon four filter (SR-6301) is connected to the shell side inlet of the catalytic distillation tower top cooler (E-6406) through a pipeline, and the shell side outlet of the catalytic distillation tower top cooler (E-6406) is connected to the tube side inlet of the reaction high-efficiency heat exchanger (E-6308) through a pipeline. The tube-side outlet of the heat exchanger (E-6308) is connected to the inlet of the isomerization heating furnace (H-6301) through a pipeline, the outlet of the isomerization heating furnace (H-6301) is connected to the inlet of the isomerization reactor (R-6301) through a pipeline, the outlet of the isomerization reactor (R-6301) is connected to the shell-side inlet of the high-efficiency reaction heat exchanger (E-6308) through a pipeline, the shell-side outlet of the high-efficiency reaction heat exchanger (E-6308) is connected to the shell-side inlet of the reactor discharge heat exchanger (E-6301) through a pipeline, and the shell-side outlet of the reactor discharge heat exchanger (E-6301) is connected to the centrifugal compressor front liquid separation tank (D-6301) through a pipeline.

2. The device for improving heat exchange efficiency of a feed preheater of a C4 reaction unit according to claim 1, characterized in that: The shell side outlet of the catalytic distillation tower top cooler (E-6406) is connected to the tube side inlet at the lower end of the reaction high-efficiency heat exchanger (E-6308) through a pipeline, and the tube side outlet at the upper end of the reaction high-efficiency heat exchanger (E-6308) is connected to the isomerization heating furnace (H-6301) through a pipeline.

3. The device for improving heat exchange efficiency of a feed preheater of a C4 reaction unit according to claim 2, characterized in that: The tube-side outlet at the upper end of the reaction high-efficiency heat exchanger (E-6308) is connected to the side line inlet of the isomerization heating furnace (H-6301) through a pipeline, and the lower side outlet of the isomerization heating furnace (H-6301) is connected to the upper inlet of the isomerization reactor (R-6301) through a pipeline.

4. The device for improving heat exchange efficiency of a feed preheater of a C4 reaction unit according to claim 3, characterized in that: The lower end outlet of the isomerization reactor (R-6301) is connected to the shell side inlet of the high efficiency heat exchanger (E-6308) through a pipeline and a transfer pump (P1).

5. The device for improving heat exchange efficiency of a feed preheater of a C4 reaction unit according to claim 4, characterized in that: The feed C4 filter (SR-6301) is provided with more than one filter packing layer.

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