Method for reducing re-contact process energy consumption of catalytic reforming device

Abstract

The invention discloses a method for reducing re-contact process energy consumption of a catalytic reforming device. The method comprises the following steps of: cooling hydrogen-mixing generated oil through circulating water heat exchange, re-contacting tank top hydrogen-containing gas heat exchange, re-contacting tank bottom oil heat exchange, chilled water heat exchange and ammonia-cooling heat exchange in turn, and then delivering the cooled hydrogen-mixing generated oil to a re-contact tank to perform gas-liquid balancing separation, wherein the chilled water of 5 to 10 DEG C is producedby delivering the hot water of 90 to 95 DEG C generated by low-temperature waste heat of a refinery to a refrigerating unit. The method can reduce the load of the ammonia-cooling hydrogen-mixing generated oil or cancel the ammonia-cooling hydrogen-mixing generated oil, and shut down an ammonia refrigerating system. The method can obviously reduce the energy consumption of a re-contact system of the catalytic reforming device, and meanwhile the concentration of the hydrogen concentrated by the re-contact system can meet the production requirement. Moreover, the increment of a low-temperature heat refrigerating system can find an ideal way for the utilization of low-temperature heat. In the whole process, the flow reformation is simple and feasible, and the economic benefit is obvious.

Description

technical field

[0001] The invention belongs to the field of petroleum processing, in particular to a method for reducing the energy consumption of the recontact process of a catalytic reforming unit. Background technique

[0002] Hydrogen (H 2 ) is the basic raw material for petroleum processing enterprises, the raw material for reforming pre-hydrogenation unit, catalytic reforming unit, aromatics disproportionation and alkylation unit, aromatics isomerization unit, and also gasoline and diesel and wax oil hydrotreating unit, wax Feedstock for oil and heavy oil hydrocracking units. With the strengthened implementation of national low-sulfur fuel oil standards and the development of full-distillate hydrogenation processes that maximize the yield of light oil, the demand for hydrogen in petroleum processing has increased sharply, such as the fuel type that processes 750Mt of crude oil annually to produce clean oil products Refinery, its chemical hydrogen consumption will re...

Examples

Embodiment 1

[0027] The technological process of the catalytic reformer recontact process of the present embodiment is as follows figure 2 As shown, compared with the technical process of the catalytic reforming unit reabsorption process of the comparative example, this embodiment has been improved as follows:

[0028] (1) Increase the low-temperature thermal refrigeration system

[0029] 53.9t / h of hot water at 95°C generated by low-temperature heat is passed through a set of newly added refrigeration units to generate 129.4t / h of chilled water at 5°C, and the temperature of hot water leaving the refrigeration unit is about 80°C.

[0030] (2) Improvement of heat transfer process

[0031] In the follow-up process of heat exchange between the hydrogen-mixed oil and the re-contact tank bottom oil, a hydrogen-mixed oil-chilled water heat exchanger is added. The heat exchange process is as follows: the 129.4t / h, 5°C chilled water generated in (1) passes through the newly added hydrogen-mixe...

Embodiment 2

[0038] The technological process of the catalytic reformer recontact process of the present embodiment is as follows figure 2 As shown, compared with the technical process of the catalytic reforming unit reabsorption process of the comparative example, this embodiment has been improved as follows:

[0039] (1) Increase the low-temperature thermal refrigeration system

[0040] 49.8t / h of 90°C hot water generated by low-temperature heat is passed through a new refrigeration unit to generate 79.6t / h of 10°C chilled water, and the temperature of the hot water leaving the refrigeration unit is about 80°C.

[0041] (2) Improvement of heat transfer process

[0042] In the follow-up process of heat exchange between the hydrogen-mixed oil and the re-contact tank bottom oil, a hydrogen-mixed oil-chilled water heat exchanger is added. The heat exchange process is as follows: the 79.6t / h, 10°C chilled water generated in (1) passes through the newly added hydrogen-mixed oil-chilled wate...

Embodiment 3

[0049] The technological process of the catalytic reformer recontacting system of the present embodiment is as follows image 3 As shown, the difference between this embodiment and embodiment 1 is the improvement of the heat exchange process, which is as follows:

[0050] (1) Changes in the load of the low-temperature thermal refrigeration system

[0051] 55.63t / h of 95°C hot water generated by low-temperature heat passes through a refrigeration unit to produce 133.52t / h of 5°C chilled water, and the temperature of the hot water leaving the refrigeration unit is 80°C.

[0052] (2) Cancellation of ammonia cooling reforming oil and gas process

[0053] After the hydrogen-mixed oil is cooled to 12°C by chilled water, it directly enters the recontact tank for gas-liquid balance. Cancel the process of cooling it to 0°C through the ammonia cooling system.

[0054] (3) Improvement of heat transfer process

[0055] After being cooled by circulating water, the 40°C hydrogen-mixed o...

technical field

[0001] The invention belongs to the field of petroleum processing, in particular to a method for reducing the energy consumption of the recontact process of a catalytic reforming unit. Background technique

[0002] Hydrogen (H 2 ) is the basic raw material for petroleum processing enterprises, the raw material for reforming pre-hydrogenation unit, catalytic reforming unit, aromatics disproportionation and alkylation unit, aromatics isomerization unit, and also gasoline and diesel and wax oil hydrotreating unit, wax Feedstock for oil and heavy oil hydrocracking units. With the strengthened implementation of national low-sulfur fuel oil standards and the development of full-distillate hydrogenation processes that maximize the yield of light oil, the demand for hydrogen in petroleum processing has increased sharply, such as the fuel type that processes 750Mt of crude oil annually to produce clean oil products Refinery, its chemical hydrogen consumption will re...

Examples

Embodiment 1

[0027] The technological process of the catalytic reformer recontact process of the present embodiment is as follows figure 2 As shown, compared with the technical process of the catalytic reforming unit reabsorption process of the comparative example, this embodiment has been improved as follows:

[0028] (1) Increase the low-temperature thermal refrigeration system

[0029] 53.9t / h of hot water at 95°C generated by low-temperature heat is passed through a set of newly added refrigeration units to generate 129.4t / h of chilled water at 5°C, and the temperature of hot water leaving the refrigeration unit is about 80°C.

[0030] (2) Improvement of heat transfer process

[0031] In the follow-up process of heat exchange between the hydrogen-mixed oil and the re-contact tank bottom oil, a hydrogen-mixed oil-chilled water heat exchanger is added. The heat exchange process is as follows: the 129.4t / h, 5°C chilled water generated in (1) passes through the newly added hydrogen-mixe...

Embodiment 2

[0038] The technological process of the catalytic reformer recontact process of the present embodiment is as follows figure 2 As shown, compared with the technical process of the catalytic reforming unit reabsorption process of the comparative example, this embodiment has been improved as follows:

[0039] (1) Increase the low-temperature thermal refrigeration system

[0040] 49.8t / h of 90°C hot water generated by low-temperature heat is passed through a new refrigeration unit to generate 79.6t / h of 10°C chilled water, and the temperature of the hot water leaving the refrigeration unit is about 80°C.

[0041] (2) Improvement of heat transfer process

[0042] In the follow-up process of heat exchange between the hydrogen-mixed oil and the re-contact tank bottom oil, a hydrogen-mixed oil-chilled water heat exchanger is added. The heat exchange process is as follows: the 79.6t / h, 10°C chilled water generated in (1) passes through the newly added hydrogen-mixed oil-chilled wate...

Embodiment 3

[0049] The technological process of the catalytic reformer recontacting system of the present embodiment is as follows image 3 As shown, the difference between this embodiment and embodiment 1 is the improvement of the heat exchange process, which is as follows:

[0050] (1) Changes in the load of the low-temperature thermal refrigeration system

[0051] 55.63t / h of 95°C hot water generated by low-temperature heat passes through a refrigeration unit to produce 133.52t / h of 5°C chilled water, and the temperature of the hot water leaving the refrigeration unit is 80°C.

[0052] (2) Cancellation of ammonia cooling reforming oil and gas process

[0053] After the hydrogen-mixed oil is cooled to 12°C by chilled water, it directly enters the recontact tank for gas-liquid balance. Cancel the process of cooling it to 0°C through the ammonia cooling system.

[0054] (3) Improvement of heat transfer process

[0055] After being cooled by circulating water, the 40°C hydrogen-mixed o...

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