Propylene compressor outlet condensation system

Abstract

The utility model relates to the technical field of olefin separation equipment, in particular to a propylene compressor outlet condensation system which comprises condensers, a liquid discharge unit and a purging unit, an inlet valve is arranged at a condensation inlet of each condenser, and an outlet valve is arranged at a condensation outlet of each condenser. The liquid discharging unit comprises a liquid discharging pipeline, and each liquid inlet of the liquid discharging pipeline is communicated with a condensation outlet of the corresponding condenser and used for discharging liquid-phase propylene in the condensers. The purging unit comprises a gas supply pipeline and an emptying pipeline, and each gas outlet of the gas supply pipeline communicates with a condensation outlet of the corresponding condenser and is used for providing purging gas into the condensers; and each gas inlet of the emptying pipeline is communicated with a condensation inlet of the corresponding condenser and is used for exhausting the purging gas in the condenser. Each condenser can be cut out independently, a propylene compressor system does not need to be integrally replaced in the overhaul period, the replacement difficulty is lowered, propylene loss is reduced, and online overhaul of the condenser is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of olefin separation equipment, in particular to an outlet condensation system of a propylene compressor. Background Art

[0002] Olefin separation refers to the process of separating different types of olefin compounds, such as propylene, butene, pentene, etc., from a mixture. Most separation operations in olefin separation units need to be performed at low temperatures, and the propylene refrigeration system provides a refrigerant with a minimum temperature of -40.8°C for the separation of the reaction mixture. The propylene refrigeration system consists of a multi-stage centrifugal compressor and related buffer tanks and condensers.

[0003] After the propylene gas is compressed to 1.6MPa by the propylene compressor, it is condensed to liquid propylene at 40℃ by the propylene condenser and then enters the propylene refrigerant storage tank. The cooling medium of the condenser is circulating water. Long-term use of the condenser is prone to tube bundle leakage. Propylene leaks into the circulating water, causing pollution to the circulating water system, reducing heat exchange efficiency, and high outlet pressure and temperature of the propylene compressor. The device needs to be stopped to inspect the condenser.

[0004] Because the condenser has no isolation manual valve, the condenser cannot be isolated separately. The propylene compressor system needs to be replaced as a whole during the maintenance period. The replacement is difficult and time-consuming, and also causes a large amount of propylene loss. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the utility model provides a propylene compressor outlet condensation system, in which each condenser can be individually removed for replacement and maintenance, and the condenser can be repaired online under full load, thereby reducing the difficulty of replacement and the loss of propylene.

[0006] The utility model provides a propylene compressor outlet condensation system, which is used to be arranged between a compressor and a propylene refrigerant storage tank. The condensation system comprises a condenser, the condensation inlet of the condenser is connected to the outlet of the compressor, the condensation outlet of the condenser is connected to the propylene refrigerant storage tank, at least two condensers are arranged in parallel, an inlet valve is arranged at the condensation inlet of each condenser, and an outlet valve is arranged at the condensation outlet, and further comprises:

[0007] A liquid discharge unit, comprising a liquid discharge pipeline, wherein the liquid discharge pipeline has at least two liquid inlets, each of which is connected to a corresponding condensation outlet of a condenser and is used to discharge the liquid in the condenser;

[0008] The purge unit comprises a gas supply line and a vent line, wherein the gas supply line has at least two gas outlets, each of which is connected to a condensation outlet of a corresponding condenser and is used to provide purge gas to the condenser; the vent line has at least two gas inlets, each of which is connected to a condensation inlet of a corresponding condenser and is used to discharge the purge gas in the condenser.

[0009] Preferably, flange covers are provided at both the inlet valve and the outlet valve.

[0010] Preferably, each liquid inlet on the liquid discharge line is provided with a liquid discharge valve, and the inlet of the liquid discharge valve is communicated with the inlet of the corresponding outlet valve.

[0011] Preferably, each gas outlet of the gas supply pipeline is provided with a gas outlet valve, and the outlet of the gas outlet valve is connected to the inlet of the corresponding outlet valve.

[0012] Preferably, each gas inlet of the vent line is provided with a gas inlet valve, and the inlet of the gas inlet valve is connected to the outlet of the corresponding inlet valve.

[0013] Preferably, the inlet of the gas supply line is connected to an inert gas supply assembly for providing inert gas to the condenser.

[0014] Preferably, the inlet of the gas supply line is connected to a nitrogen gas supply assembly for providing nitrogen to the condenser.

[0015] Preferably, the outlet of the vent line is connected to a flare system.

[0016] Preferably, five condensers are provided, and the five condensers are arranged in parallel between the compressor and the propylene refrigerant storage tank, and the number of the liquid inlet, the gas outlet, and the gas inlet is the same as the number of the condensers.

[0017] Compared with the prior art, the utility model provides a propylene compressor outlet condensation system, which has the following beneficial effects:

[0018] The utility model provides a propylene compressor outlet condensation system, which is provided with at least two condensers, and an inlet valve is provided at the condensation inlet of each condenser, and an outlet valve is provided at the condensation outlet of each condenser. When in use, when one of the condensers needs to be repaired, the inlet valve and the outlet valve corresponding to this condenser are closed, and this condenser is individually isolated, and then the liquid phase propylene in the condenser is emptied through the drain pipeline, and then the gas phase propylene in the condenser is replaced through the purge unit, and the gas phase propylene is purged out of the condenser, and the condenser can be delivered for maintenance. Each condenser can be cut out separately, and during the maintenance period, there is no need to replace the propylene compressor system as a whole, so the replacement difficulty is reduced, the loss of propylene is reduced, and the device does not need to be stopped, so that the condenser can be repaired online. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of Example 2 of the utility model.

[0021] Description of reference numerals:

[0022] 1. Compressor; 2. Propylene refrigerant storage tank; 3. Condenser; 301. Condensation inlet; 302. Inlet valve; 303. Condensation outlet; 304. Outlet valve; 4. Vent pipeline; 5. Gas supply pipeline; 6. Drain pipeline; 7. Circulating cold water pipeline; 8. Circulating hot water pipeline. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1 to Figure 2 , the specific implementation methods of the utility model are described in detail, but it should be understood that the protection scope of the utility model is not limited by the specific implementation methods.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] In addition, in the description of this application, "plurality" means two or more than two. The terms "first" and "second" are used for descriptive purposes only and should not be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature.

[0026] Example 1

[0027] This embodiment provides a propylene compressor outlet condensation system, such as Figure 1 As shown, it is used to be arranged between the compressor 1 and the propylene refrigerant storage tank 2, the condensation system includes a condenser 3, the condensation inlet 301 of the condenser 3 is connected to the outlet of the compressor 1, the condensation outlet 303 of the condenser 3 is connected to the propylene refrigerant storage tank 2, at least two condensers 3 are arranged in parallel, the condensation inlet 301 of each condenser 3 is provided with an inlet valve 302, the condensation outlet 303 is provided with an outlet valve 304, and also includes a drainage unit and a purge unit.

[0028] During use, when one of the condensers 3 needs to be overhauled, the inlet valve 302 and the outlet valve 304 corresponding to this condenser 3 are closed, and this condenser 3 is individually isolated, and the propylene liquid in the condenser 3 is discharged through the drainage unit, and then the propylene gas in the condenser 3 is purged and discharged through the purge unit, thereby reducing the loss of propylene and enabling online maintenance of the condenser without stopping the device.

[0029] The drainage unit includes a drainage pipeline 6 having at least two liquid inlets, each of which is connected to a corresponding condensation outlet 303 of a condenser 3 and is used to discharge the liquid propylene in the condenser 3. The outlet of the drainage pipeline 6 can be connected to a liquid propylene collection tank to collect the liquid propylene.

[0030] The purge unit includes a gas supply line 5 and a vent line 4. The gas supply line 5 has at least two gas outlets, each of which is connected to a condensation outlet 303 of a corresponding condenser 3, and is used to provide purge gas to the condenser 3; the vent line 4 has at least two gas inlets, each of which is connected to a condensation inlet 301 of a corresponding condenser 3, and is used to discharge the purge gas in the condenser 3.

[0031] The purge gas purges and replaces the gaseous phase propylene in the condenser 3, and the gaseous phase propylene is replaced and discharged from the condenser 3. The discharged gas can be connected to a gas collection tank for collection.

[0032] In order to completely isolate the condenser 3 and avoid the loss of propylene due to the inlet valve 302 and the outlet valve 304 being not tightly closed, flange covers are provided at the inlet valve 302 and the outlet valve 304. After the inlet valve 302 and the outlet valve 304 are closed, the connection between the condenser 3 and the compressor 1 and the propylene refrigerant storage tank 2 is cut off through the flange cover.

[0033] In order to realize the separate control between each branch line in the drain unit and the purge unit, a drain valve is provided at each liquid inlet of the drain line 6, and the inlet of the drain valve is connected to the inlet of the corresponding outlet valve 304. A gas outlet valve is provided at each gas outlet of the gas supply line 5, and the outlet of the gas outlet valve is connected to the inlet of the corresponding outlet valve 304. A gas inlet valve is provided at each gas inlet of the vent line 4, and the inlet of the gas inlet valve is connected to the outlet of the corresponding inlet valve 302.

[0034] In this embodiment, the purge gas used by the purge unit is an inert gas, and the inlet of the gas supply line 5 is connected to an inert gas supply assembly for supplying inert gas to the condenser 3. The inert gas will not react with hydrocarbons or form an explosive mixture. The inert gas is preferably nitrogen.

[0035] Since propylene is a flammable and toxic gas, in order to avoid environmental pollution, the outlet of the vent line 4 is connected to a flare system, and the flare system burns the gaseous propylene.

[0036] How to use this embodiment

[0037] The present embodiment provides a propylene compressor outlet condensation system. When one of the condensers 3 needs to be repaired, the inlet valve 302 and the outlet valve 304 of the condenser 3 that needs to be repaired are closed, and the drain valve at the liquid inlet of the drain line 6 connected to the condenser 3 that needs to be repaired is opened to empty the liquid propylene in the condenser 3, and then the gas outlet valve of the corresponding gas supply line 5 is opened to purge and replace the gaseous propylene in the condenser 3 with nitrogen, and the gas inlet valve of the venting line 4 is opened to finally discharge the purge gas and the carried gaseous propylene to the flare system through the venting line 4 to complete the replacement of the condenser 3. After the replacement is qualified, the flange covers at the inlet valve 302 and the outlet valve 304 are turned to the blind position, and the condenser 3 is delivered for maintenance.

[0038] Example 2

[0039] The condensation system provided in this embodiment is based on the embodiment 1. Figure 2 As shown, there are five condensers 3, which are arranged in parallel between the compressor 1 and the propylene refrigerant storage tank 2. Four condensers 3 are used to ensure the condensation of propylene by the propylene refrigeration system in the olefin separation device, and the other condenser 3 is used as a backup. When other condensers 3 need regular inspection or maintenance, the backup condenser 3 is operated, and the condenser can be inspected and repaired online at full load. Figure 2 The portion framed by the cloud frame is a schematic diagram of one set of condensers and the corresponding drain units and purge units.

[0040] Matching with five condensers 3, the number of liquid inlets of the drain line 6 in the drain unit, the gas outlets of the gas supply line 5 in the purge unit, and the gas inlets of the vent line 4 are the same as the number of condensers 3. Each liquid inlet is connected to one of the condensation outlets 303, each gas outlet is connected to a condensation outlet 303, and each gas inlet is connected to a condensation inlet 301.

[0041] In this embodiment, circulating water is used as the cooling medium of the condenser 3 , a circulating cold water pipeline 7 is connected to the cooling medium inlet of the condenser 3 , and a circulating hot water pipeline 8 is connected to the cooling medium outlet of the condenser 3 .

[0042] The above disclosure is only a preferred specific embodiment of the present invention, but the embodiments of the present invention are not limited thereto, and any changes that can be conceived by technicians in this field should fall within the protection scope of the present invention.

Claims

1. A propylene compressor outlet condensation system, used to be arranged between a compressor (1) and a propylene refrigerant storage tank (2), the condensation system comprising a condenser (3), a condensation inlet (301) of the condenser (3) being connected to an outlet of the compressor (1), and a condensation outlet (303) of the condenser (3) being connected to a propylene refrigerant storage tank (2), characterized in that: At least two condensers (3) are arranged in parallel, and an inlet valve (302) is arranged at the condensation inlet (301) of each condenser (3), and an outlet valve (304) is arranged at the condensation outlet (303), and further comprising: A liquid discharge unit, comprising a liquid discharge pipeline (6), wherein the liquid discharge pipeline (6) has at least two liquid inlets, each liquid inlet being connected to a condensation outlet (303) of a corresponding condenser (3) and used for discharging liquid in the condenser (3); A purge unit comprises a gas supply pipeline (5) and a venting pipeline (4), wherein the gas supply pipeline (5) has at least two gas outlets, each gas outlet is connected to a condensation outlet (303) of a corresponding condenser (3), and is used to provide purge gas to the condenser (3); and the venting pipeline (4) has at least two gas inlets, each gas inlet is connected to a condensation inlet (301) of a corresponding condenser (3), and is used to discharge the purge gas in the condenser (3).

2. A propylene compressor outlet condensation system as claimed in claim 1, characterized in that: The inlet valve (302) and the outlet valve (304) are both provided with flange covers.

3. A propylene compressor outlet condensation system as claimed in claim 1, characterized in that: Each liquid inlet on the liquid discharge pipeline (6) is provided with a liquid discharge valve, and the inlet of the liquid discharge valve is connected to the inlet of the corresponding outlet valve (304).

4. A propylene compressor outlet condensation system as claimed in claim 1, characterized in that: Each gas outlet of the gas supply pipeline (5) is provided with a gas outlet valve, and the outlet of the gas outlet valve is connected to the inlet of the corresponding outlet valve (304).

5. A propylene compressor outlet condensation system as claimed in claim 1, characterized in that: A gas inlet valve is provided at each gas inlet of the venting pipeline (4), and the inlet of the gas inlet valve is connected to the outlet of the corresponding inlet valve (302).

6. A propylene compressor outlet condensation system as claimed in claim 1, characterized in that: The inlet of the gas supply pipeline (5) is connected to an inert gas supply assembly for supplying inert gas to the condenser (3).

7. A propylene compressor outlet condensation system as claimed in claim 1, characterized in that: The inlet of the gas supply pipeline (5) is connected to a nitrogen gas supply assembly for supplying nitrogen to the condenser (3).

8. A propylene compressor outlet condensation system as claimed in claim 1, characterized in that: The outlet of the vent line (4) is connected to a flare system.

9. A propylene compressor outlet condensation system as claimed in claim 1, characterized in that: Five condensers (3) are provided, and the five condensers (3) are arranged in parallel between the compressor (1) and the propylene refrigerant storage tank (2), and the number of the liquid inlet, the gas outlet, and the gas inlet is the same as the number of the condensers (3).

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