Liquid-phase propylene vaporization cold energy recovery device

Abstract

The utility model relates to a liquid-phase propylene vaporization cold energy recovery device. According to the technical scheme, the lower end of a liquid-phase propylene storage tank is connected to a lower-side inlet of a first-stage propylene vaporizer through a pipeline and a circulating pump, an upper-side outlet of the liquid-phase propylene storage tank is connected to a lower-side inlet of a second-stage propylene vaporizer through a pipeline, and the upper-side outlet of the liquid-phase propylene storage tank is connected to a lower-side inlet of a third-stage propylene vaporizer through a pipeline; an upper side outlet of the propylene third-stage vaporizer is connected to an inlet of the circulating water return heat exchanger through a pipeline, and gas-phase propylene is discharged from an upper side outlet of the circulating water return heat exchanger; the top of the shell side of the propylene secondary vaporizer is connected with an ethylene glycol refrigerating fluid inlet pipeline, the bottom of the shell side is connected to the top of the shell side of the propylene primary vaporizer, and the bottom of the shell side is connected with an ethylene glycol refrigerating fluid return pipeline. The device has the beneficial effects that the multi-stage vaporizers and the refrigerating fluid recovery and circulating water return heat exchanger are additionally arranged, so that the cooling capacity of propylene vaporization is fully absorbed, finally, the propylene temperature control parameter is adjusted by hot water, and the energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to a liquid-phase propylene vaporization device, in particular to a liquid-phase propylene vaporization cold recovery device. Background Art

[0002] In the chlorohydrinization process for producing propylene oxide, the raw propylene used is 1.1 MPa liquid propylene at room temperature. After a first-stage vaporization and a first-stage superheating step, the liquid propylene is vaporized into a 60°C, 0.55 MPa vapor propylene, which is then fed to the chlorohydrin reaction. This production process presents challenges: incomplete vaporization in the first-stage propylene vaporizer, with some vaporization relying on heat from the superheater. This results in high superheater hot water usage, high plant energy consumption, and insufficient utilization of the cooling capacity generated by the propylene vaporization process. To actively respond to the national call for building a conservation-oriented society and implement energy conservation and emission reduction initiatives, a cold recovery technology for the propylene vaporizer in propylene oxide plants has been designed to recover some of the cooling capacity and reduce energy consumption. Utility Model Content

[0003] The purpose of this utility model is to address the above-mentioned defects of the existing technology and provide a liquid-phase propylene vaporization cold recovery device. On the basis of the original, a multi-stage vaporizer and a refrigerant recovery and a circulating water return heat exchanger are set to fully absorb the cold energy of propylene vaporization, and finally the propylene temperature control parameters are adjusted by hot water.

[0004] The utility model discloses a liquid-phase propylene vaporization cooling energy recovery device, and its technical solution is as follows: comprising a liquid-phase propylene storage tank (1), a circulation pump (2), a propylene primary vaporizer (E101), a propylene secondary vaporizer (E102), a propylene tertiary vaporizer (E103), and a circulating water return heat exchanger (E104), wherein the lower end of the liquid-phase propylene storage tank (1) is connected to the lower inlet of the propylene primary vaporizer (E101) through a pipeline and the circulation pump (2), the upper outlet of the propylene primary vaporizer (E101) is connected to the lower inlet of the propylene secondary vaporizer (E102) through a pipeline, the upper outlet of the propylene secondary vaporizer (E102) is connected to the lower inlet of the propylene tertiary vaporizer (E103) through a pipeline, and the upper outlet of the propylene tertiary vaporizer (E103) is connected to the circulating water return heat exchanger (E104) through a pipeline. The inlet of the water heat exchanger (E104) and the upper outlet of the circulating water return heat exchanger (E104) discharge gaseous propylene; the top of the shell side of the propylene secondary vaporizer (E102) is connected to the ethylene glycol refrigeration liquid inlet pipeline, the bottom of the shell side of the propylene secondary vaporizer (E102) is connected to the top of the shell side of the propylene primary vaporizer (E101) through a pipeline, and the bottom of the shell side of the propylene primary vaporizer (E101) is connected to the ethylene glycol refrigeration liquid return pipeline; the top of the shell side of the propylene tertiary vaporizer (E103) is connected to the circulating water inlet pipeline, and the bottom of the shell side of the propylene tertiary vaporizer (E103) is connected to the circulating water return pipeline; the top of the shell side of the circulating water return heat exchanger (E104) is connected to the hot water supply pipeline, and the bottom of the shell side of the circulating water return heat exchanger (E104) is connected to the hot water return pipeline.

[0005] Preferably, the outlet end of the circulation pump (2) is divided into two pipelines, wherein the first pipeline is connected to the lower inlet of the propylene primary vaporizer (E101) through the first control valve (3), and the second pipeline is connected to the lower inlet of the propylene primary vaporizer (E101) through the liquid inlet regulating valve (4).

[0006] Preferably, the outlet end of the liquid inlet regulating valve (4) is connected to the secondary liquid inlet pipeline (b) and the fifth control valve (8) through the first liquid distribution pipeline (a) and the second control valve (5), and then connected to the lower inlet of the propylene secondary vaporizer (E102); the upper outlet of the propylene primary vaporizer (E101) is connected to the common pipeline (c) through the third control valve (6), and then connected to the secondary liquid inlet pipeline (b) through the lower end of the common pipeline (c); the upper end of the common pipeline (c) is connected to the lower inlet of the propylene tertiary vaporizer (E103) through the second liquid distribution pipeline (d).

[0007] Preferably, the upper outlet of the above-mentioned propylene secondary vaporizer (E102) is connected to the second liquid separation pipeline (d) through a pipeline and a sixth control valve (9).

[0008] Preferably, the hot water supply pipeline connected to the top of the shell side of the circulating water return heat exchanger (E104) is divided into two pipelines, one pipeline is installed with a hot water supply regulating valve (14), and the other pipeline is installed with a hot water supply stop valve (15); the hot water return pipeline connected to the bottom of the shell side of the circulating water return heat exchanger (E104) is provided with a hot water return valve (16).

[0009] Preferably, an ethylene glycol outlet control valve (10) is provided on the ethylene glycol refrigerant return line connected to the bottom of the shell side of the above-mentioned propylene primary vaporizer (E101), and an ethylene glycol inlet control valve (11) is provided on the ethylene glycol refrigerant inlet line connected to the top.

[0010] Preferably, a circulating water inlet valve (12) is provided on the circulating water inlet pipeline connected to the top of the shell side of the above-mentioned propylene three-stage vaporizer (E103), and a circulating water return valve (13) is provided on the circulating water return pipeline connected to the bottom of the shell side of the propylene three-stage vaporizer (E103).

[0011] Preferably, a fourth control valve (7) is provided on the second liquid separation pipeline (d).

[0012] The beneficial effects of the utility model are as follows: liquid propylene enters the first-stage propylene vaporizer and the second-stage propylene vaporizer through a liquid inlet regulating valve to control the flow rate; the heat exchange medium is ethylene glycol refrigerated liquid with a temperature of about 10°C after heat exchange in the device; the partially vaporized liquid propylene enters the third-stage propylene vaporizer; the heat exchange medium of the third-stage propylene vaporizer is the circulating water return water of the device with a temperature of 30-32°C, so that the liquid propylene is completely vaporized; the completely vaporized propylene passes through the circulating water return heat exchanger and is superheated to a control parameter with hot water at about 65°C; in this heat exchange process, according to the characteristics of the device itself, the ethylene glycol refrigerated liquid and circulating water after heat exchange in the device are used to absorb the cold energy of the vaporized propylene to a great extent, thereby reducing the energy consumption of the device and achieving better economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model;

[0014] Figure 2 This is a schematic structural diagram of Example 2 of the present utility model;

[0015] In the figure above: liquid propylene storage tank 1, circulating pump 2, first control valve 3, liquid inlet regulating valve 4, second control valve 5, third control valve 6, fourth control valve 7, fifth control valve 8, sixth control valve 9, ethylene glycol liquid outlet control valve 10, ethylene glycol liquid inlet control valve 11, circulating water liquid inlet valve 12, circulating water return valve 13, hot water supply regulating valve 14, hot water supply stop valve 15, hot water return valve 16, propylene first-stage vaporizer E101, propylene second-stage vaporizer E102, propylene third-stage vaporizer E103, circulating water return heat exchanger E104, first liquid distribution pipeline a, second liquid inlet pipeline b, common pipeline c, second liquid distribution pipeline d. DETAILED DESCRIPTION

[0016] 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.

[0017] Example 1, with reference to Figure 1 The utility model mentions a liquid-phase propylene vaporization cooling energy recovery device, comprising a liquid-phase propylene storage tank 1, a circulating pump 2, a propylene primary vaporizer E101, a propylene secondary vaporizer E102, a propylene tertiary vaporizer E103, and a circulating water return heat exchanger E104. The lower end of the liquid-phase propylene storage tank 1 is connected to the lower inlet of the propylene primary vaporizer E101 through a pipeline and the circulating pump 2, the upper outlet of the propylene primary vaporizer E101 is connected to the lower inlet of the propylene secondary vaporizer E102 through a pipeline, the upper outlet of the propylene secondary vaporizer E102 is connected to the lower inlet of the propylene tertiary vaporizer E103 through a pipeline, and the upper outlet of the propylene tertiary vaporizer E103 is connected to the circulating water return heat exchanger E104 through a pipeline. 4, and the upper outlet of the circulating water return heat exchanger E104 discharges gaseous propylene; the top of the shell side of the propylene secondary vaporizer E102 is connected to the ethylene glycol refrigerant inlet pipeline, the bottom of the shell side of the propylene secondary vaporizer E102 is connected to the top of the shell side of the propylene primary vaporizer E101 through a pipeline, and the bottom of the shell side of the propylene primary vaporizer E101 is connected to the ethylene glycol refrigerant return pipeline; the top of the shell side of the propylene tertiary vaporizer E103 is connected to the circulating water inlet pipeline, and the bottom of the shell side of the propylene tertiary vaporizer E103 is connected to the circulating water return pipeline; the top of the shell side of the circulating water return heat exchanger E104 is connected to the hot water supply pipeline, and the bottom of the shell side of the circulating water return heat exchanger E104 is connected to the hot water return pipeline.

[0018] Among them, the outlet end of the above-mentioned circulation pump 2 is divided into two pipelines, among which the first pipeline is connected to the lower inlet of the propylene primary vaporizer E101 through the first control valve 3, and the second pipeline is connected to the lower inlet of the propylene primary vaporizer E101 through the liquid inlet regulating valve 4, so as to facilitate better control and open the corresponding valve according to different needs.

[0019] The hot water supply pipeline connected to the top of the shell side of the above-mentioned circulating water return heat exchanger E104 is divided into two pipelines, one pipeline is installed with a hot water supply regulating valve 14, and the other pipeline is installed with a hot water supply stop valve 15; the hot water return pipeline connected to the bottom of the shell side of the circulating water return heat exchanger E104 is provided with a hot water return valve 16.

[0020] An ethylene glycol outlet control valve 10 is provided on the ethylene glycol refrigerant return line connected to the bottom of the shell side of the above-mentioned propylene primary vaporizer E101, and an ethylene glycol inlet control valve 11 is provided on the ethylene glycol refrigerant inlet line connected to the top.

[0021] A circulating water inlet valve 12 is provided on the circulating water inlet pipeline connected to the top of the shell side of the above-mentioned propylene three-stage vaporizer E103, and a circulating water return valve 13 is provided on the circulating water return pipeline connected to the bottom of the shell side of the propylene three-stage vaporizer E103.

[0022] The second liquid dispensing line d is provided with a fourth control valve 7 .

[0023] When the utility model is used, the first control valve 3 and the hot water supply stop valve 15 are closed, and the liquid inlet regulating valve 4, the third control valve 6, the fifth control valve 8, the sixth control valve 9 and the hot water supply regulating valve 14 are opened. The liquid phase propylene from the liquid phase propylene storage tank 1 controls the flow rate through the liquid inlet regulating valve 4 to enter the propylene primary vaporizer E101 and the propylene secondary vaporizer E102. The heat exchange medium of the propylene primary vaporizer E101 and the propylene secondary vaporizer E102 is the ethylene glycol refrigeration liquid with a temperature of about 10°C after the heat exchange of the device. After partial vaporization, The liquid propylene enters the propylene three-stage vaporizer E103. The heat exchange medium of the propylene three-stage vaporizer E103 is the circulating water return water of the device, with a temperature of 30-32°C, which realizes the complete vaporization of the liquid propylene. The completely vaporized propylene passes through the circulating water return heat exchanger E104 and is superheated with hot water at about 65°C to the control parameters. In this heat exchange process, according to the characteristics of the device itself, the ethylene glycol refrigerant and circulating water after heat exchange are used to absorb the cold energy of the vaporized propylene to a great extent, reducing the energy consumption of the device and achieving good economic benefits.

[0024] Example 2, reference Figure 1The utility model mentions a liquid-phase propylene vaporization cooling energy recovery device, comprising a liquid-phase propylene storage tank 1, a circulating pump 2, a propylene primary vaporizer E101, a propylene secondary vaporizer E102, a propylene tertiary vaporizer E103, and a circulating water return heat exchanger E104. The lower end of the liquid-phase propylene storage tank 1 is connected to the lower inlet of the propylene primary vaporizer E101 through a pipeline and the circulating pump 2, the upper outlet of the propylene primary vaporizer E101 is connected to the lower inlet of the propylene secondary vaporizer E102 through a pipeline, the upper outlet of the propylene secondary vaporizer E102 is connected to the lower inlet of the propylene tertiary vaporizer E103 through a pipeline, and the upper outlet of the propylene tertiary vaporizer E103 is connected to the circulating water return heat exchanger E104 through a pipeline. 4, and the upper outlet of the circulating water return heat exchanger E104 discharges gaseous propylene; the top of the shell side of the propylene secondary vaporizer E102 is connected to the ethylene glycol refrigerant inlet pipeline, the bottom of the shell side of the propylene secondary vaporizer E102 is connected to the top of the shell side of the propylene primary vaporizer E101 through a pipeline, and the bottom of the shell side of the propylene primary vaporizer E101 is connected to the ethylene glycol refrigerant return pipeline; the top of the shell side of the propylene tertiary vaporizer E103 is connected to the circulating water inlet pipeline, and the bottom of the shell side of the propylene tertiary vaporizer E103 is connected to the circulating water return pipeline; the top of the shell side of the circulating water return heat exchanger E104 is connected to the hot water supply pipeline, and the bottom of the shell side of the circulating water return heat exchanger E104 is connected to the hot water return pipeline.

[0025] The difference from Example 1 is:

[0026] Reference Figure 2 The outlet end of the liquid inlet regulating valve 4 mentioned in this embodiment is connected to the secondary liquid inlet pipeline b and the fifth control valve 8 through the first liquid distribution pipeline a and the second control valve 5, and then connected to the lower inlet of the propylene secondary vaporizer E102; the upper outlet of the propylene primary vaporizer E101 is connected to the common pipeline c through the third control valve 6, and then connected to the secondary liquid inlet pipeline b through the lower end of the common pipeline c; the upper end of the common pipeline c is connected to the lower inlet of the propylene tertiary vaporizer E103 through the second liquid distribution pipeline d.

[0027] The upper outlet of the above-mentioned propylene secondary vaporizer E102 is connected to the second liquid separation pipeline d through a pipeline and a sixth control valve 9.

[0028] During use, according to actual work needs, the second control valve 5 can be opened and the fourth control valve 7 can be closed, and the liquid propylene can be intermittently controlled to enter the propylene first-stage vaporizer E101 and the propylene second-stage vaporizer E102 for vaporization, so as to achieve better control as needed to meet the needs of the site.

[0029] 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 liquid-phase propylene vaporization cold recovery device, characterized in that: The invention comprises a liquid-phase propylene storage tank (1), a circulation pump (2), a propylene primary vaporizer (E101), a propylene secondary vaporizer (E102), a propylene tertiary vaporizer (E103), and a circulating water return heat exchanger (E104). The lower end of the liquid-phase propylene storage tank (1) is connected to the lower inlet of the propylene primary vaporizer (E101) through a pipeline and the circulation pump (2). The upper outlet of the propylene primary vaporizer (E101) is connected to the lower inlet of the propylene secondary vaporizer (E102) through a pipeline. The upper outlet of the propylene secondary vaporizer (E102) is connected to the lower inlet of the propylene tertiary vaporizer (E103) through a pipeline. The upper outlet of the propylene tertiary vaporizer (E103) is connected to the inlet of the circulating water return heat exchanger (E104) through a pipeline. The upper outlet of the circulating water return heat exchanger (E104) discharges gaseous propylene; the top of the shell side of the propylene secondary vaporizer (E102) is connected to the ethylene glycol refrigeration liquid inlet pipeline, the bottom of the shell side of the propylene secondary vaporizer (E102) is connected to the top of the shell side of the propylene primary vaporizer (E101) through a pipeline, and the bottom of the shell side of the propylene primary vaporizer (E101) is connected to the ethylene glycol refrigeration liquid return pipeline; the top of the shell side of the propylene tertiary vaporizer (E103) is connected to the circulating water inlet pipeline, and the bottom of the shell side of the propylene tertiary vaporizer (E103) is connected to the circulating water return pipeline; the top of the shell side of the circulating water return heat exchanger (E104) is connected to the hot water supply pipeline, and the bottom of the shell side of the circulating water return heat exchanger (E104) is connected to the hot water return pipeline.

2. A liquid-phase propylene vaporization refrigeration recovery device according to claim 1, characterized in that: The outlet end of the circulation pump (2) is divided into two pipelines, wherein the first pipeline is connected to the lower inlet of the propylene primary vaporizer (E101) through the first control valve (3), and the second pipeline is connected to the lower inlet of the propylene primary vaporizer (E101) through the liquid inlet regulating valve (4).

3. A liquid-phase propylene vaporization refrigeration recovery device according to claim 2, characterized in that: The outlet end of the liquid inlet regulating valve (4) is connected to the secondary liquid inlet pipeline (b) and the fifth control valve (8) through the first liquid distribution pipeline (a) and the second control valve (5), and then connected to the lower inlet of the propylene secondary vaporizer (E102); the upper outlet of the propylene primary vaporizer (E101) is connected to the common pipeline (c) through the third control valve (6), and then connected to the secondary liquid inlet pipeline (b) through the lower end of the common pipeline (c); the upper end of the common pipeline (c) is connected to the lower inlet of the propylene tertiary vaporizer (E103) through the second liquid distribution pipeline (d).

4. A liquid-phase propylene vaporization refrigeration recovery device according to claim 3, characterized in that: The upper outlet of the propylene secondary vaporizer (E102) is connected to the second liquid separation pipeline (d) through a pipeline and a sixth control valve (9).

5. A liquid-phase propylene vaporization refrigeration recovery device according to claim 4, characterized in that: The hot water supply pipeline connected to the top of the shell side of the circulating water return heat exchanger (E104) is divided into two pipelines, one pipeline is equipped with a hot water supply regulating valve (14), and the other pipeline is equipped with a hot water supply stop valve (15); the hot water return pipeline connected to the bottom of the shell side of the circulating water return heat exchanger (E104) is provided with a hot water return valve (16).

6. A liquid-phase propylene vaporization refrigeration recovery device according to claim 5, characterized in that: An ethylene glycol outlet control valve (10) is provided on the ethylene glycol refrigerant return pipeline connected to the bottom of the shell side of the propylene primary vaporizer (E101), and an ethylene glycol inlet control valve (11) is provided on the ethylene glycol refrigerant inlet pipeline connected to the top.

7. A liquid-phase propylene vaporization refrigeration recovery device according to claim 6, characterized in that: A circulating water inlet valve (12) is provided on the circulating water inlet pipeline connected to the top of the shell side of the propylene three-stage vaporizer (E103), and a circulating water return valve (13) is provided on the circulating water return pipeline connected to the bottom of the shell side of the propylene three-stage vaporizer (E103).

8. The liquid-phase propylene vaporization refrigeration recovery device according to claim 7, characterized in that: The second liquid distribution pipeline (d) is provided with a fourth control valve (7).

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