CN214991350U - Hydrocracking tail gas recycling system - Google Patents
Hydrocracking tail gas recycling system Download PDFInfo
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- CN214991350U CN214991350U CN202121292486.2U CN202121292486U CN214991350U CN 214991350 U CN214991350 U CN 214991350U CN 202121292486 U CN202121292486 U CN 202121292486U CN 214991350 U CN214991350 U CN 214991350U
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Abstract
The utility model discloses a hydrocracking tail gas recycle system, including low branch's gas stripping hydrogen unit, cracking sulphur removal unit, cracking liquefied gas processing unit, modification dry gas processing unit, fuel gas processing unit and fuel gas pipeline, the tail gas export of low branch's gas stripping hydrogen unit, cracking sulphur removal unit, cracking liquefied gas processing unit and modification dry gas processing unit connects in parallel and sets up and with fuel gas pipeline intercommunication, the exit end of fuel gas pipeline with fuel gas processing unit intercommunication; the system collects and uniformly treats tail gas of a plurality of hydrocracking devices, can effectively reduce tail gas treatment cost, and utilizes effective ingredients in the tail gas to carry out secondary utilization, and is economic and environment-friendly.
Description
Technical Field
The utility model relates to a petroleum refining cracker technical field, concretely relates to hydrocracking tail gas recycle system.
Background
In the production process of petroleum hydrocracking, a large amount of hydrogen-containing tail gas and hydrocarbon-containing tail gas can be generated, fuel gas systems of all the devices are independently set in the past, dry gas and low-pressure gas generated by the devices are independently merged into the fuel systems of the devices, and the surplus gas is discharged to a torch.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a hydrocracking tail gas recycle system to the defect that prior art exists.
The technical scheme of the utility model is that:
the hydrocracking tail gas recycling system comprises a low-component hydrogen stripping unit, a cracking sulfur removal unit, a cracking liquefied gas processing unit, a modified dry gas processing unit, a fuel gas processing unit and a fuel gas pipeline, tail gas outlets of the low-component hydrogen stripping unit, the cracking sulfur removal unit, the cracking liquefied gas processing unit and the modified dry gas processing unit are arranged in parallel and are communicated with the fuel gas pipeline, and an outlet end of the fuel gas pipeline is communicated with the fuel gas processing unit;
the fuel gas treatment unit comprises a fuel gas treatment unit liquid separation tank and a hydrocracking combustion furnace, wherein the inlet of the fuel gas treatment unit liquid separation tank is connected with the fuel gas pipeline, and the outlet of the fuel gas treatment unit liquid separation tank is connected with the hydrocracking combustion furnace.
Preferably, the low-fraction gas hydrogen extraction unit comprises a oil removal tank, a hydrogen extraction adsorption tower and an air suction compressor which are connected in series sequentially through pipelines;
the oil removal tank is connected with a hydrocracking device on the upstream of the production line, the hydrogen extraction adsorption tower is provided with a hydrogen discharge pipe and is communicated with an external hydrogen storage tank, and the discharge pipe of the suction compressor is communicated with the fuel gas pipeline.
Preferably, a three-way crossover valve is arranged at an inlet of the oil removal tank, a branch line of the tail gas crossover line is arranged on one side of the crossover valve, and an outlet end of the tail gas crossover line is communicated with the fuel gas pipeline.
Preferably, the cracking sulfur removal unit comprises a sulfur-containing dry gas cooler, a sulfur-containing dry gas liquid separation tank, a sulfur removal unit desulfurization tower and a desulfurization dry gas liquid separation tank which are sequentially connected in series through pipelines, and a discharge pipe of the desulfurization dry gas liquid separation tank is communicated with the fuel gas pipeline.
Preferably, the cracked liquefied gas treatment unit comprises a liquefied gas vaporizer, a liquefied gas desulfurization tower, a liquid hydrocarbon coalescer, a liquefied gas water cooler before desulfurization and a liquefied gas cooler, the liquefied gas desulfurization tower, the liquid hydrocarbon coalescer, the liquefied gas water cooler before desulfurization and the liquefied gas cooler are sequentially connected through pipelines, and a discharge pipe of the liquefied gas cooler is communicated with the fuel gas pipeline;
the liquefied gas cooler is provided with a branch line and is communicated with the liquefied gas vaporizer, and a discharge pipe of the liquefied gas vaporizer is communicated with the fuel gas pipeline.
Preferably, the modified dry gas treatment unit comprises a dry gas liquid separating tank, a modified dry gas unit desulfurizing tower and a modified dry gas unit fuel gas liquid separating tank, the dry gas liquid separating tank and the modified dry gas unit desulfurizing tower are sequentially connected in series through a pipeline, and a discharge pipe of the dry gas liquid separating tank is communicated with the fuel gas pipeline;
the dry gas liquid separating tank is provided with a backflow branch line and is communicated with the modified dry gas unit fuel gas liquid separating tank.
Compared with the prior art, the utility model, have following advantage:
the tail gas of a plurality of devices of hydrocracking is collected and unified the processing to this system, can reduce the tail gas treatment cost effectively and utilize the active ingredient in the tail gas to carry out the reutilization, simultaneously through carrying out unified collection and unified processing to unstable tail gas, can effectual improvement utilization efficiency, converts the high-quality resource that can supply the utilization into with tail gas, and energy-concerving and environment-protective reduces consumption and cost.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure: 1-low-split gas hydrogen extraction unit, 2-cracking sulfur removal unit, 3-cracking liquefied gas treatment unit, 4-modified dry gas treatment unit, 5-fuel gas treatment unit and 6-fuel gas pipeline;
11-oil removal tank, 12-hydrogen extraction adsorption tower, 121-hydrogen discharge pipe, 122-hydrogen storage tank, 13-suction compressor, 14-crossover valve, 15-tail gas crossover, 21-sulfur-containing dry gas liquid separation tank, 22-sulfur removal unit desulfurization tower, 23-desulfurization dry gas liquid separation tank, 24-sulfur-containing dry gas cooler, 31-liquefied gas desulfurization tower, 32-liquefied gas vaporizer, 33-liquid hydrocarbon coalescer, 34-liquefied gas water cooler before desulfurization, 35-liquefied gas cooler, 41-dry gas liquid separation tank, 42-modified dry gas unit desulfurization tower, 43-modified dry gas unit fuel gas liquid separation tank, 51-fuel gas treatment unit liquid separation tank and 52-hydrocracking combustion furnace.
Detailed Description
In the following description, numerous implementation details are set forth in order to provide a more thorough understanding of the present invention. It should be understood, however, that these implementation details should not be used to limit the invention. That is, in some embodiments of the invention, details of these implementations are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings.
Example one
Referring to fig. 1, the hydrocracking tail gas recycling system comprises a low-component hydrogen stripping unit 1, a cracking sulfur removal unit 2, a cracking liquefied gas treatment unit 3, a modified dry gas treatment unit 4, a fuel gas treatment unit 5 and a fuel gas pipeline 6, wherein the low-component hydrogen stripping unit 1, the cracking sulfur removal unit 2, the cracking liquefied gas treatment unit 3 and the modified dry gas treatment unit 4 are arranged in parallel to collect and primarily treat tail gas in an early stage, and then the tail gas is introduced into the fuel gas treatment unit 5 through the fuel gas pipeline 6.
The fuel gas treatment unit 5 comprises a fuel gas treatment unit liquid separation tank 51 and a hydrocracking combustion furnace 52 which are connected in series, and fuel gas conveyed by each unit through a fuel gas pipeline 6 enters the fuel gas treatment unit liquid separation tank 51 for liquid separation and then is introduced into the hydrocracking combustion furnace 52 for combustion treatment, so that tail gas is recycled, the energy consumption is reduced, and the pollution to the environment is avoided.
Example two
Referring to fig. 1, basically the same as the first embodiment, the difference is that the desulfurized low-fraction gas from hydrocracking and hydro-upgrading enters a low-fraction gas hydrogen stripping unit 1, the gas sequentially passes through a degreasing tank 11, enters a hydrogen stripping adsorption tower 12 after being buffered, and is subjected to selective adsorption by a plurality of layers of adsorbents to completely remove impurities therein, so that the product hydrogen with the purity of more than 99.99% is obtained and sent out of a boundary region, and hydrogen recovery, resource utilization, energy conservation and consumption reduction are realized. Impurity components and partial hydrogen adsorbed in the adsorbent are flushed and desorbed by hydrogen in a sequential discharge gas tank, and are pressurized to 0.45Mpa by a low-pressure-gas desorption compressor 13 and then sent to a fuel gas pipeline 6.
Dotted line: if the low-fraction hydrogen stripping unit 1 is stopped, low-fraction gas (containing 95 percent of hydrogen) produced by the hydrocracking and hydro-upgrading device directly enters the fuel gas pipeline 6 through the crossover valve 14 and the tail gas crossover 15.
The method comprises the following steps of mixing exhaust gas of a top reflux tank of a hydrocracking main stripping tower and exhaust gas of a top reflux tank of a debutanizer and feeding the mixture into a cracking desulfurization unit 2, cooling fluid to 40 ℃ by a sulfur-containing dry gas cooler 24, then feeding the cooled fluid into a sulfur-containing dry gas liquid separation tank 21 for liquid separation, feeding the liquid-separated gas into a desulfurization unit 22 for desulfurization to be in countercurrent contact with lean liquid at the tower top to remove hydrogen sulfide, and feeding the desulfurized dry gas into a fuel gas pipeline 6 after the liquid separation is carried out by the desulfurization dry gas liquid separation tank 23 from the tower top.
EXAMPLE III
Referring to fig. 1, basically the same as the first embodiment, except that the hydrocracked liquefied gas flows into the cracked liquefied gas treatment unit 3 from the debutanizer reflux drum, the fluid enters (E1302) a liquefied gas water cooler 34 for cooling before desulfurization, then enters a liquefied gas cooler 35 through a liquefied gas desulfurization tower 31 and a liquid hydrocarbon coalescer 33, and then is divided into two paths, one path is sent to the fuel gas pipeline 6; the other path is sent to a liquefied gas vaporizer 32, processed and sent to a fuel gas pipeline 6.
Sending the mixed gas at the top of the high-pressure rich liquid tank from the top reflux tank of the main hydro-upgrading stripping tower to an upgrading dry gas treatment unit 4, sending the gas to a desulfurizing tower 42 of an upgrading dry gas unit for desulfurization, and separating the desulfurized dry gas in a dried gas separating tank 41 after the desulfurization to a fuel gas pipeline 6; when the dry gas produced by the hydro-upgrading self-production stops merging into the fuel gas pipeline 6, the dry gas directly passes through the fuel gas liquid separation tank 43 of the dry gas upgrading unit to be combusted in each furnace of the hydro-upgrading device.
The present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge range of those skilled in the art without departing from the spirit of the present invention, and the changed contents still belong to the protection scope of the present invention.
Claims (6)
1. Hydrocracking tail gas recycle system including low minute gas stripping hydrogen unit, cracking sulphur removal unit, cracking liquefied gas processing unit, modification dry gas processing unit, fuel gas processing unit and fuel gas pipeline, its characterized in that: the tail gas outlets of the low-pressure-drop hydrogen extraction unit, the cracking desulfurization unit, the cracking liquefied gas treatment unit and the upgrading dry gas treatment unit are arranged in parallel and are communicated with the fuel gas pipeline, and the outlet end of the fuel gas pipeline is communicated with the fuel gas treatment unit;
the fuel gas treatment unit comprises a fuel gas treatment unit liquid separation tank and a hydrocracking combustion furnace, wherein the inlet of the fuel gas treatment unit liquid separation tank is connected with the fuel gas pipeline, and the outlet of the fuel gas treatment unit liquid separation tank is connected with the hydrocracking combustion furnace.
2. The hydrocracking tail gas recycle system of claim 1, characterized in that: the low-pressure-component gas hydrogen extraction unit comprises an oil removal tank, a hydrogen extraction adsorption tower and an air suction compressor which are connected in series sequentially through pipelines;
the oil removal tank is connected with a hydrocracking device on the upstream of the production line, the hydrogen extraction adsorption tower is provided with a hydrogen discharge pipe and is communicated with an external hydrogen storage tank, and the discharge pipe of the suction compressor is communicated with the fuel gas pipeline.
3. The hydrocracking tail gas recycle system of claim 2, characterized in that: the inlet of the oil removal tank is provided with a three-way crossover valve, one side of the crossover valve is provided with a branch line of a tail gas crossover line, and the outlet end of the tail gas crossover line is communicated with the fuel gas pipeline.
4. The hydrocracking tail gas recycle system of claim 1, characterized in that: the cracking sulfur removal unit comprises a sulfur-containing dry gas cooler, a sulfur-containing dry gas liquid separation tank, a sulfur removal unit desulfurization tower and a desulfurization dry gas liquid separation tank which are sequentially connected in series through pipelines, and a discharge pipe of the desulfurization dry gas liquid separation tank is communicated with the fuel gas pipeline.
5. The hydrocracking tail gas recycle system of claim 1, characterized in that: the cracking liquefied gas treatment unit comprises a liquefied gas vaporizer, a liquefied gas desulfurization tower, a liquid hydrocarbon coalescer, a liquefied gas water cooler before desulfurization and a liquefied gas cooler, the liquefied gas desulfurization tower, the liquid hydrocarbon coalescer, the liquefied gas water cooler before desulfurization and the liquefied gas cooler are sequentially connected through pipelines, and a discharge pipe of the liquefied gas cooler is communicated with the fuel gas pipeline;
the liquefied gas cooler is provided with a branch line and is communicated with the liquefied gas vaporizer, and a discharge pipe of the liquefied gas vaporizer is communicated with the fuel gas pipeline.
6. The hydrocracking tail gas recycle system of claim 1, characterized in that: the modified dry gas treatment unit comprises a dry gas liquid separating tank, a modified dry gas unit desulfurizing tower and a modified dry gas unit fuel gas liquid separating tank, the dry gas liquid separating tank and the modified dry gas unit desulfurizing tower are sequentially connected in series through a pipeline, and a discharging pipe of the dry gas liquid separating tank is communicated with the fuel gas pipeline;
the dry gas liquid separating tank is provided with a backflow branch line and is communicated with the modified dry gas unit fuel gas liquid separating tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121292486.2U CN214991350U (en) | 2021-06-10 | 2021-06-10 | Hydrocracking tail gas recycling system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121292486.2U CN214991350U (en) | 2021-06-10 | 2021-06-10 | Hydrocracking tail gas recycling system |
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| CN214991350U true CN214991350U (en) | 2021-12-03 |
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| CN202121292486.2U Active CN214991350U (en) | 2021-06-10 | 2021-06-10 | Hydrocracking tail gas recycling system |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Hydrocracking tail gas recovery and utilization system Effective date of registration: 20220616 Granted publication date: 20211203 Pledgee: Shandong Guangrao Rural Commercial Bank Co.,Ltd. Pledgor: GUANGRAO KELIDA PETROCHEMICAL TECHNOLOGY Co.,Ltd. Registration number: Y2022980007920 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230628 Granted publication date: 20211203 Pledgee: Shandong Guangrao Rural Commercial Bank Co.,Ltd. Pledgor: GUANGRAO KELIDA PETROCHEMICAL TECHNOLOGY Co.,Ltd. Registration number: Y2022980007920 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |