A device and method for recovering effective components of low pressure gas from a gas holder

Abstract

The present application belongs to the field of chemical technology, and discloses a kind of effective component recovery device of low-pressure gas of gas tank, including gas storage tank and gas liquid separation tank, and the low-pressure gas is separated out by discharging gas pipe network to collect the exhaust gas of each equipment, and the gas storage tank is communicated with the gas liquid separation tank and recovers and stores low-pressure gas, a kind of effective component recovery method of low-pressure gas of gas tank, comprising the following steps: step S1, low gas collection pressurization;Step S2, effective component first separation recovery;Step S3, effective component secondary separation recovery, the liquefied gas component and gasoline component of effective component are separated from fuel gas component by the vent gas of each equipment being collected by discharging gas pipe network and being handled by gas liquid separation tank recovery device, with the ability of efficient recovery of effective component and conversion into product, for the enterprise to increase production, while also for the enterprise to save not small production cost, avoid the waste of effective component.

Description

TECHNICAL FIELD

[0001] The present application relates to the chemical technology field, and in particular to a gas tank low-pressure gas effective component recovery device and method. BACKGROUND

[0002] All the low-pressure gas of the whole plant enters the gas tank for recovery, is pressurized by the gas tank compressor, enters the catalytic dry gas desulfurization tower for desulfurization treatment, and then enters the high-pressure gas fuel system for use of the whole plant, through analysis of the gas components in the gas tank, it is found that the carbon three and carbon four liquefied gas effective components are relatively high, and have certain recovery value, therefore, a recovery device needs to be designed to recover and process the effective components to be converted into products. SUMMARY

[0003] To solve the above-mentioned technical problems, the present application provides a gas tank low-pressure gas effective component recovery device and method, which has the advantages of efficient recovery of effective components and conversion into products, and effectively solves the technical problems that the effective components in the fuel gas are burned and wasted in the prior art.

[0004] To achieve the above-mentioned purposes, the technical scheme adopted by the present application is as follows:

[0005] A gas tank low-pressure gas effective component recovery device, comprising a gas storage tank and a gas liquid separation tank, the gas liquid separation tank collects the exhaust gas of each device through a discharge gas pipe network and separates low-pressure gas, the gas storage tank is in communication with the gas liquid separation tank and recovers and stores the low-pressure gas, the output end of the gas storage tank is in communication with the input end of a gas tank compressor through a pipeline, the output end of the gas tank compressor is in communication with the input end of a gas-liquid separation tank through a high-pressure gas pipeline, the gas-liquid separation tank is arranged at the top of a catalytic fractionating tower, the liquid outlet end of the gas-liquid separation tank is in communication with the input end of one side of the top of an absorption tower through a pipeline, the gas outlet end of the gas-liquid separation tank is in communication with the input end of a mixed gas compressor through a pipeline, the output end of the mixed gas compressor is in communication with the input end of a mixed gas separation tank, the gas outlet end of the mixed gas separation tank is in communication with the input end of the absorption tower through a pipeline, the liquid outlet end of the mixed gas separation tank is in communication with the input end of one side of the bottom of a desorption tower through a pipeline, the output end of the top of the absorption tower is in communication with the input end of one side of the bottom of a re-absorption tower through a pipeline, and the output end of the top of the re-absorption tower is connected to a fuel gas pipeline through a pipeline;

[0006] The desorption tower bottom outlet end is communicated with the input end of the middle part of the stabilizing tower through a pipeline, the stabilizing tower bottom oil outlet end is connected to the gasoline pipeline through a pipeline, the liquid inlet end of the left side of the bottom of the reflux tank is communicated with the liquid outlet end of the other side of the stabilizing tower through a pipeline, the gas inlet end of the left side of the top of the reflux tank is communicated with the gas outlet end of the top of the stabilizing tower through a pipeline, the liquid outlet end of the right side of the bottom of the reflux tank is connected to the liquefied gas pipeline through a pipeline, and the gas outlet end of the right side of the top of the reflux tank is connected to the fuel gas pipeline through a pipeline.

[0007] Further, the first air cooler and the first water cooler are sequentially connected between the gas mixing compressor and the mixed gas separation tank from left to right through pipelines, the bottom of the absorption tower is communicated with the pipeline between the air cooler and the water cooler through a pipeline, and the gas outlet end of the top of the desorption tower is communicated with the pipeline before the first air cooler through a pipeline.

[0008] Further, the second air cooler and the second water cooler are sequentially connected between the gas inlet end of the reflux tank and the gas inlet end of the stabilizing tower from left to right through pipelines.

[0009] Further, the high-pressure gas pipeline is provided with a flow regulating valve close to the gas-liquid separation tank.

[0010] A gas tank low-pressure gas effective component recovery method, comprising the following steps:

[0011] Step S1, low-pressure gas collection and pressurization,

[0012] The low-pressure gas is collected and pressurized, and then sent to the gas separation tank after condensate separation, and then sent to the gas tank, then extracted from the gas tank and pressurized by the gas tank compressor, then sent to the gas-liquid separation tank through the high-pressure gas pipeline, and the flow and pressure of the high-pressure gas are controlled by the flow regulating valve during the process;

[0013] Step S2, primary separation and recovery of effective components,

[0014] The high-pressure gas sent by the high-pressure gas pipeline is separated into gas and liquid phases by the gas-liquid separation tank and the overhead oil gas of the catalytic fractionating column, the liquid phase is sent to the absorption tower as a complementary absorbent, the gas phase is sent to the gas mixing compressor for pressurization, the gas phase is cooled by the first air cooler and the first water cooler after gas mixing compression, then enters the mixed gas separation tank for secondary separation of the liquid phase and the gas phase, the gas phase enters the absorption tower, and the liquid phase enters the desorption tower, the overhead gas of the absorption tower enters the reabsorption tower, the carbon two and above fuel gas components at the bottom of the reabsorption tower are used through the overhead fuel gas pipeline, and the bottom of the absorption tower is refluxed to the first water cooler for cooling and separation again.

[0015] Step S3, secondary separation and recovery of effective components,

[0016] The desorption gas at the top of the desorption tower returns to the backflow before the first air cooler, the liquid phase at the bottom of the desorption tower enters the stabilizing tower, the gas at the top of the stabilizing tower after separation is separated into liquefied gas and non-condensable gas components after passing through the second air cooler and the second water cooler and is connected to the liquefied gas pipeline and the fuel gas pipeline respectively, and the gasoline component at the bottom of the stabilizing tower is connected to the gasoline pipeline.

[0017] Compared with the prior art, the beneficial effects of the present application are:

[0018] The present application separates the liquefied gas component and the gasoline component from the fuel gas component by collecting the vent gas discharged from each device through the vent gas pipe network, separating the low-pressure gas through the gas separation tank, storing the gas through the gas storage tank, and increasing the pressure through the gas tank compressor and sending it to the present recovery device for processing, thereby having the ability to efficiently recover the effective components and convert them into products, increasing production for enterprises while also saving considerable production costs for enterprises, having a reasonable structure, energy saving and emission reduction, and avoiding waste of effective components. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0020] Fig. 1 is a schematic diagram of the overall plan structure of the present application;

[0021] Fig. 2 is a schematic diagram of the prior art structure of the present application;

[0022] Fig. 3 is a flow chart of the recovery method of the present application.

[0023] BRIEF DESCRIPTION OF DRAWINGS: 1, vent gas pipe network; 2, gas separation tank; 3, gas storage tank; 4, gas tank compressor; 5, high-pressure gas pipeline; 6, flow regulating valve; 7, catalytic fractionating tower; 8, gas-liquid separation tank; 9, mixed gas compressor; 10, first air cooler; 11, first water cooler; 12, mixed gas separation tank; 13, absorption tower; 14, desorption tower; 15, reabsorption tower; 16, stabilizing tower; 17, second air cooler; 18, second water cooler; 19, backflow tank; 20, fuel gas pipeline; 21, liquefied gas pipeline; 22, gasoline pipeline. DETAILED DESCRIPTION

[0024] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0026] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0028] In addition, the terms "first", "second" are only for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0029] Embodiments

[0030] Referring to the drawings Figs. 1-3The present application aims to solve the above-mentioned technical problems, and provides a gas tank low-pressure gas effective component recovery device, which comprises a gas storage tank 3 and a gas separation tank 2. The gas separation tank 2 collects the exhaust gas of each device through the exhaust gas pipe network 1 and separates the low-pressure gas. The gas storage tank 3 is in communication with the gas separation tank 2 and recovers and stores the low-pressure gas. The output end of the gas storage tank 3 is in communication with the input end of the gas tank compressor 4 through a pipeline. The output end of the gas tank compressor 4 is in communication with the input end of the gas-liquid separation tank 8 through a high-pressure gas pipeline 5. The gas-liquid separation tank 8 is arranged at the top of the catalytic fractionating column 7. The liquid outlet end of the gas-liquid separation tank 8 is in communication with the input end of the top of one side of the absorption tower 13 through a pipeline. The gas outlet end of the gas-liquid separation tank 8 is in communication with the input end of the mixed gas compressor 9 through a pipeline. The output end of the mixed gas compressor 9 is in communication with the input end of the mixed gas separation tank 12. The gas outlet end of the mixed gas separation tank 12 is in communication with the input end of the absorption tower 13 through a pipeline. The liquid outlet end of the mixed gas separation tank 12 is in communication with the input end of one side of the bottom of the desorption tower 14 through a pipeline. The output end of the top of the absorption tower 13 is in communication with the input end of one side of the bottom of the re-absorption tower 15 through a pipeline. The output end of the top of the re-absorption tower 15 is connected to the fuel gas pipeline 20 through a pipeline.

[0031] The liquid outlet end of the bottom of the desorption tower 14 is in communication with the input end of one side of the middle of the stabilizing tower 16 through a pipeline. The oil outlet end of the bottom of the stabilizing tower 16 is connected to the gasoline pipeline 22 through a pipeline. The liquid outlet end of the other side of the stabilizing tower 16 is in communication with the liquid inlet end of the bottom of the left side of the reflux tank 19 through a pipeline. The gas inlet end of the top of the left side of the reflux tank 19 is in communication with the gas outlet end of the top of the stabilizing tower 16 through a pipeline. The liquid outlet end of the right side of the bottom of the reflux tank 19 is connected to the liquefied gas pipeline 21 through a pipeline. The gas outlet end of the right side of the top of the reflux tank 19 is connected to the fuel gas pipeline 20 through a pipeline.

[0032] The first air cooler 10 and the first water cooler 11 are sequentially connected between the mixed gas compressor 9 and the mixed gas separation tank 12 through pipelines from left to right. The bottom of the absorption tower 13 is connected to the pipeline between the air cooler and the water cooler through a pipeline. The gas outlet end of the top of the desorption tower 14 is connected to the pipeline before the first air cooler 10 through a pipeline. Through the setting of the reflux pipeline, the effective components in the mixed gas can be more fully separated, so as to further improve the recovery efficiency of the effective components of the device.

[0033] Specifically, the vent gas is discharged from each device in the whole plant and collected through the vent gas pipe network 1, and the condensate carried in the vent gas is separated through the gas separation tank 2. The gas storage tank 3 is used to store the collected gas and increase the pressure of the gas through the gas tank compressor 4. The pressurized gas enters the gas-liquid separation tank 8 at the top of the catalytic fractionating tower 7 through the high-pressure gas pipeline 5 for gas-liquid phase separation. At the same time, the flow regulating valve 6 is arranged on the high-pressure gas pipeline 5 to regulate and control the flow of high-pressure gas. The condensate separated by the gas-liquid separation tank 8 is sent to the absorption tower 13 as a supplementary absorbent. The mixed gas is compressed by the mixed gas compressor 9, cooled by the first air cooler 10 and the first water cooler 11, and separated into liquid and gas phases by the mixed gas separation tank. The gas phase enters the absorption tower 13, and the liquid phase enters the desorption tower 14. The absorption tower 13 separates the fuel gas components of carbon two and above in the mixed gas, and the desorption tower 14 separates the light components in the liquid phase. The further absorption tower 15 further separates the fuel gas components of carbon two and above in the mixed gas from the absorption tower 13 and connects to the fuel gas pipeline 20 for use. The stable tower 16 system composed of the stable tower 16, the second air cooler 17, the second water cooler 18 and the reflux tank 19 separates the liquid phase from the desorption tower 14 into liquefied gas and gasoline components, and separates the liquefied gas and gasoline components into the liquefied gas pipeline 21 and the gasoline pipeline 22, respectively, through the stable tower 16;

[0034] Through analysis of the gas component in the gas storage tank 3, the carbon three content accounts for 17.32%, the carbon four content accounts for 8.14%, the hydrogen content accounts for 49.86%, the carbon one and carbon two components account for 7.2%, and the carbon five and above components account for 1.35%;

[0035] After separating and recovering the gas components in the gas storage tank 3 by the device, the fuel gas components of hydrogen, carbon one and carbon two account for 57.06%; the liquefied gas components of carbon three and carbon four account for 24.06%, and the gasoline components of carbon five and above components account for 2.75%, and part of the carbon four enters the gasoline components;

[0036] The gas flow of the gas storage tank 3 is 4800m 3 / h, which provides 2738.88m 3 / h of fuel gas for the plant area, increases the production of liquid liquefied gas by 2.71t / h, and gasoline by 0.31t / h;

[0037] According to the above data analysis, the device has the ability to efficiently recover the effective components in the low-pressure gas and convert them into products, which not only increases the production of the enterprise but also saves a considerable production cost for the enterprise. The structure is reasonable, energy-saving and emission-reducing.

[0038] On the other hand, as Fig. 3 shown, a gas tank low-pressure gas effective component recovery method includes the following steps:

[0039] Step S1, collecting and pressurizing the low-pressure gas,

[0040] Low pressure gas is collected by exhaust gas pipe network 1 from each device, enters the gas separation tank 2 after separating condensate, and is sent to the gas storage tank 3, then is extracted from the gas storage tank 3, is pressurized by the gas tank compressor 4, is sent to the gas-liquid separation tank 8 through the high pressure gas pipeline 5, and the flow and pressure of the high pressure gas are controlled by adjusting the flow valve during the process;

[0041] Step S2, primary separation and recovery of effective components,

[0042] The high pressure gas sent by the high pressure gas pipeline 5 is separated into gas and liquid phases by the gas-liquid separation tank 8, the liquid phase is sent to the absorption tower 13 as a supplementary absorbent, the gas phase is sent to the mixed gas compressor 9 for pressure increase, the gas phase is cooled by the first air cooler 10 and the first water cooler 11 after being compressed, then enters the mixed gas separation tank 12 for secondary separation of liquid and gas phases, the gas phase enters the absorption tower 13, the liquid phase enters the desorption tower 14, the overhead gas of the absorption tower 13 enters the reabsorption tower 15, the carbon two and above fuel gas components at the bottom of the reabsorption tower 15 are used through the overhead input fuel gas pipeline 20, and the bottom gas of the absorption tower 13 is cooled and separated again before the first water cooler 11;

[0043] Step S3, secondary separation and recovery of effective components,

[0044] After the liquid phase enters the desorption tower 14, the desorption gas at the top of the desorption tower 14 is returned to the first air cooler 10, the liquid phase at the bottom of the desorption tower 14 enters the stabilizing tower 16, the overhead gas separated by the stabilizing tower 16 enters the reflux tank 19 after passing through the second air cooler 17 and the second water cooler 18 to separate liquefied gas and non-condensable gas components and is connected to the liquefied gas pipeline 21 and the fuel gas pipeline 20 respectively, and the gasoline component is produced at the bottom of the stabilizing tower 16 and is connected to the gasoline pipeline 22.

[0045] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A device for recovering low-pressure gas effective components from a gas holder, comprising a gas storage tank and a gas separation tank, the gas separation tank collecting exhaust gas from each device through an exhaust gas pipe network and separating low-pressure gas, the gas storage tank being in communication with the gas separation tank and recovering and storing the low-pressure gas, characterized in that, The output end of the gas storage cabinet is communicated with the input end of the gas cabinet compressor through a pipeline, the output end of the gas cabinet compressor is communicated with the input end of the gas-liquid separation tank through a high-pressure gas pipeline, the gas-liquid separation tank is arranged at the top of the catalytic fractionating column, the liquid outlet end of the gas-liquid separation tank is communicated with the input end of the top of one side of the absorption tower through a pipeline, the gas outlet end of the gas-liquid separation tank is communicated with the input end of the mixed gas compressor through a pipeline, the output end of the mixed gas compressor is communicated with the input end of the mixed gas separation tank, the gas outlet end of the mixed gas separation tank is communicated with the input end of the absorption tower through a pipeline, the liquid outlet end of the mixed gas separation tank is communicated with the input end of the bottom of one side of the desorption tower through a pipeline, the output end of the top of the absorption tower is communicated with the input end of the bottom of one side of the reabsorption tower through a pipeline, and the output end of the top of the reabsorption tower is connected with the fuel gas pipeline through a pipeline; The liquid outlet end of the bottom of the desorption tower is communicated with the input end of the middle of one side of the stabilizing tower through a pipeline, the oil outlet end of the bottom of the stabilizing tower is connected with the gasoline pipeline through a pipeline, the liquid outlet end of the other side of the stabilizing tower is communicated with the liquid inlet end of the bottom of the left side of the reflux tank through a pipeline, the gas outlet end of the top of the stabilizing tower is communicated with the gas inlet end of the top of the left side of the reflux tank through a pipeline, the liquid outlet end of the bottom of the right side of the reflux tank is connected with the liquefied gas pipeline through a pipeline, and the gas outlet end of the top of the right side of the reflux tank is connected with the fuel gas pipeline through a pipeline. First and second air coolers and first and second water coolers are sequentially connected between the mixed gas compressor and the mixed gas separation tank from left to right through pipelines, the bottom of the absorption tower is communicated with the pipeline between the air cooler and the water cooler through a pipeline, and the gas outlet end of the top of the desorption tower is communicated with the pipeline before the first air cooler through a pipeline. A flow regulating valve is arranged on the high-pressure gas pipeline and close to the gas-liquid separation tank.

2. A device for recovering low pressure gas effective components from a gas holder according to claim 1, characterized in that, Second air and water coolers are sequentially connected between the gas inlet ends of the stabilizing tower and the reflux tank from left to right through pipelines.

3. The method for recovering effective components of low-pressure gas from a gas holder, applied to the device for recovering effective components of low-pressure gas from a gas holder according to any one of claims 1-2, characterized in that, The method comprises the following steps: Step S1, low-pressure gas collection and pressurization, Low-pressure gas is collected through a discharge gas pipeline network, and then is sent to a gas separation tank after separation of condensate, and then is extracted from the gas separation tank, is pressurized by a gas cabinet compressor, and is sent to a gas-liquid separation tank through a high-pressure gas pipeline, during which the flow and pressure of the high-pressure gas are controlled by a flow regulating valve. Step S2, primary separation and recovery of effective components, The gas-liquid separation tank separates high-pressure gas sent from the high-pressure gas pipeline and oil gas at the top of the catalytic fractionating column into gas and liquid phases, the liquid phase is sent to the absorption tower as a complementary absorbent, and the gas phase is sent to a mixed gas compressor for pressurization, the gas phase is cooled by first and second air coolers and first and second water coolers after mixed gas compression, and then is sent to a mixed gas separation tank for secondary separation of liquid and gas phases, the gas phase is sent to the absorption tower, the liquid phase is sent to the desorption tower, gas at the top of the absorption tower is sent to the reabsorption tower, fuel gas components with carbon two and above at the bottom of the reabsorption tower are sent to a fuel gas pipeline through the top of the tower, and the bottom of the absorption tower is refluxed to the first water cooler for cooling and separation. Step S3, secondary separation and recovery of effective components, The liquid phase enters the desorption tower, the desorption tower top analysis gas returns to the first air cooler front reflux, the desorption tower bottom liquid phase enters the stabilizing tower, the stabilizing tower top gas after the second air cooler and the second water cooler enters the reflux tank to separate the liquefied gas and the incondensable gas components and respectively access the liquefied gas pipeline and the fuel gas pipeline, the stabilizing tower bottom produces the gasoline component and accesses the gasoline pipeline.

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