CN216337451U - High-sulfur high-solid heavy oil (oil coal slurry) deep hydrodesulfurization system - Google Patents

Abstract

The utility model discloses a high-sulfur and high-solids heavy oil (oil-coal slurry) deep hydrodesulfurization system. The high-sulfur and high-solids heavy oil, the heavy product at the bottom of a four-stage high-pressure gas-liquid separator, new hydrogen and circulating hydrogen are mixed , the four together enter the first-stage tubular reactor from the top, the product is divided into gas phase and liquid phase through the first-stage high-pressure gas-liquid separator, the gas-phase product enters the low-pressure gas-liquid separator, and the liquid-phase product is used as the secondary tubular reactor. Raw material; the product of the secondary tubular reactor enters the secondary high-pressure gas-liquid separator, the gas-phase product enters the low-pressure gas-liquid separator, and the liquid-phase product is used as the raw material of the tertiary tubular reactor; the product of the tertiary tubular reactor enters the third-stage tubular reactor In the high-pressure gas-liquid separator, the gas-phase product enters the low-pressure gas-liquid separator, and the liquid-phase product enters the four-stage high-pressure gas-liquid separator for further separation; part of the top product of the low-pressure separator is discharged, part is used as circulating hydrogen, and the bottom product is used for subsequent further processing. raw material. The utility model improves the efficiency of hydrogenation reaction and hydrodesulfurization.

Description

A high-sulfur and high-solids heavy oil (oil-coal slurry) deep hydrodesulfurization system

technical field

The utility model relates to the technical field of petrochemical industry, in particular to a deep hydrodesulfurization system for high-sulfur and high-solids heavy oil (oil-coal slurry).

Background technique

Due to the high non-hydrocarbon impurities such as sulfur and high solid content, the high-sulfur and high-solids heavy oil-coal slurry has a huge impact on the long-term stable operation of the device, and it is not easy to deeply desulfurize the high-sulfur and high-solids heavy oil-coal slurry.

First of all, due to the high sulfur content of high-sulfur and high-solids heavy oil-coal slurry, the sulfur element is removed in the hydrocracking process and then enters the reaction system in the form of hydrogen sulfide. In the existing technical system, impurity gases such as hydrogen sulfide always exist in the reaction system during the entire reaction process, and are not discharged from the separation system until the end of the entire reaction. The presence of a large amount of impurity gases such as hydrogen sulfide will have a certain impact on the reaction. On the one hand, it will significantly reduce the hydrogen partial pressure and restrict the hydrogenation reaction; on the other hand, from the perspective of chemical balance, the presence of excess hydrogen sulfide will inhibit the hydrogenation reaction. The reaction of hydrodesulfurization to hydrogen sulfide proceeds forward, which affects the desulfurization efficiency.

Secondly, the high-sulfur and high-solids heavy oil-coal slurry has a high solid content, which means a large number of green coke centers. The high-sulfur and high-solids heavy oil-coal slurry contains a large amount of coke components such as colloidal asphaltenes, and at the same time superimposed with high solids content, it further promotes the formation of coke and affects the long-term stable operation of the device.

In view of this, it is necessary to propose improvement measures for the hydrodesulfurization process technology of the tubular reactor to improve the efficiency of hydrogenation reaction and hydrodesulfurization.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned deficiencies of the prior art, the purpose of this utility model is to provide a deep hydrodesulfurization system for high-sulfur and high-solids heavy oil (oil-coal slurry), which optimizes the one-stage reactor into a three-stage series-connected tubular reactor. , and set up high-pressure gas-liquid separators at the outlets of the reactors at all levels, so that the excess hydrogen sulfide gas and impurities generated by the tubular reactors at all levels are discharged from the reaction system, and at the same time, new hydrogen is supplemented at the inlets of the tubular reactors at all levels, further Reduce the content of impurity gases such as hydrogen sulfide, increase the hydrogen partial pressure, and promote the continuous forward progress of the hydrodesulfurization reaction to achieve the purpose of deep hydrodesulfurization; In the reactor, reducing back mixing and reducing the probability of coke formation; finally, a discharge port is set at the bottom of each reactor, so that coke-prone sediment and part of the coke can be discharged from the system, further reducing the probability of coke formation and prolonging the operation period of the device .

In order to achieve the above purpose, the technical scheme adopted by the present utility model is:

A high-sulfur and high-solids heavy oil (oil-coal slurry) deep hydrodesulfurization system, comprising a first-stage tubular reactor 1, the inlet end of the top of the first-stage tubular reactor 1 is connected to the new hydrogen 12 of the new hydrogen pipe network , the mixed raw material composed of the circulating hydrogen compressed by the circulating hydrogen compressor 9, the heavy oil oil-coal slurry raw material 11 from the raw material tank area and the bottom product of the four-stage high-pressure gas-liquid separator 7 pumped by the high-pressure pump;

The bottom output end of the first-stage tubular reactor 1 is connected to the first-stage high-pressure gas-liquid separator 4, and the gas-phase product at the top of the first-stage high-pressure gas-liquid separator 4 enters the low-pressure gas-liquid separator 8;

The liquid phase product at the bottom of the first-stage high-pressure gas-liquid separator 4 and the new hydrogen 12 are mixed into the input end of the top of the second-stage tubular reactor 2, and the output end of the reaction product at the bottom of the second-stage tubular reactor 2 is connected to the second-stage high-pressure gas-liquid separation The input end of the device 5, the output end of the gas-phase product at the top of the secondary high-pressure gas-liquid separator 5 is connected to the low-pressure gas-liquid separator 8, and the output end of the liquid-phase product of the substrate of the secondary high-pressure gas-liquid separator 5 is mixed with the new hydrogen 12 and then connected to the third-stage high-pressure gas-liquid separator. The top input end of the tubular reactor 3 and the bottom output end of the three-stage tubular reactor 3 are connected to the three-stage high-pressure gas-liquid separator 6;

The output end of the gas-phase product at the top of the third-stage high-pressure gas-liquid separator 6 is connected to the low-pressure gas-liquid separator 8, and the liquid-phase product at the bottom of the third-stage high-pressure gas-liquid separator 6 enters the fourth-stage high-pressure gas-liquid separator 7; the fourth-stage high-pressure gas-liquid separator 7. The top gas-phase product output end is connected to the low-pressure gas-liquid separator 8, and the bottom liquid-phase product is pumped to the top of the primary tubular reactor 1 through the high-pressure pump 10;

The bottom of the low-pressure gas-liquid separator 8 is a liquid-phase product 14, and the top is a gas-phase product, part of which is used as an external exhaust gas 13, and part of which is returned as circulating hydrogen.

A high-pressure gas-liquid separator is set at the outlet of the first-stage tubular reactor 1, the second-stage tubular reactor 2, and the third-stage tubular reactor 3.

The first-stage tubular reactor 1, the second-stage tubular reactor 2, and the third-stage tubular reactor 3 are all raw materials entering from the top of the reactor, and products discharged from the bottom of the reactor.

The top products of the first-stage high-pressure gas-liquid separator 4, the second-stage high-pressure gas-liquid separator 5, and the third-stage high-pressure gas-liquid separator 6 enter the low-pressure gas-liquid separator 8 after mixing; the top gas phase of the fourth-stage high-pressure gas-liquid separator 7 The product enters the low pressure gas-liquid separator 8 .

The tops of the first-stage tubular reactor 1, the second-stage tubular reactor 2, and the third-stage tubular reactor 3 are all supplemented with new hydrogen.

The bottoms of the first-stage tubular reactor 1, the second-stage tubular reactor 2, and the third-stage tubular reactor 3 are all provided with discharge ports.

The beneficial effects of the present utility model:

In the utility model, high-pressure gas-liquid separators are arranged at the outlets of the tubular reactors at all levels, and the gas rich in hydrogen sulfide is discharged from the reaction system, thereby effectively reducing the inhibitory effect of hydrogen sulfide in the gas-phase product on the hydrodesulfurization reaction, and improving the addition of hydrogen sulfide. The degree of hydrodesulfurization reaction is carried out, so as to achieve the purpose of deep hydrodesulfurization; in addition, the utility model takes into account the properties of high-sulfur and high-solids heavy oil (oil-coal slurry) that is easy to coke, and adjusts the feeding method to The top feeding of the reactor can reduce the residence time of the material and the probability of coke formation; finally, according to the properties of the circulating material at the bottom of the four-stage high-pressure gas-liquid separator and the properties of the product at the bottom of the low-pressure separator, adjust the four-stage high-pressure gas The circulating amount of the circulating material at the bottom of the liquid separator and the circulating ratio of each reactor.

Description of drawings

FIG. 1 is a schematic diagram of the system of the present invention.

Detailed ways

The present utility model will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 1, a high-sulfur and high-solids heavy oil (oil-coal slurry) deep hydrodesulfurization system includes the following steps:

a. The new hydrogen 12 from the new hydrogen pipeline network, the circulating hydrogen compressed by the circulating hydrogen compressor 9, the heavy oil and coal slurry raw material 11 from the raw material tank farm, and the bottom of the four-stage high-pressure gas-liquid separator 7 pumped by the high-pressure pump The product forms a mixed raw material, and the mixed raw material enters into the top of the first-stage tubular reactor 1 to undergo a hydrocracking reaction;

b. The product after the hydrocracking reaction in step a flows out from the bottom of the first-stage tubular reactor 1 and enters the first-stage high-pressure gas-liquid separator 4, and the gas-phase product at the top of the first-stage high-pressure gas-liquid separator 4 enters the low-pressure gas-liquid separation Device 8, the substrate liquid phase product is used as the raw material of the secondary tubular reactor 2;

c. Step b The liquid phase product at the bottom of the first-stage high pressure gas-liquid separator 4 is mixed with new hydrogen 12 as the raw material of the second-stage tubular reactor 2 , and the reaction product is discharged from the bottom of the reactor into the second-stage high-pressure gas-liquid separator 5 .

D. step c secondary high-pressure gas-liquid separator 5 top gas phase product enters low-pressure gas-liquid separator 8, and the substrate liquid-phase product is used as the raw material of the three-stage tubular reactor 3;

e. step d secondary high pressure gas-liquid separator 5 substrate liquid phase product is mixed with new hydrogen 12 as the raw material of tertiary tubular reactor 3, the reaction product is discharged from the bottom of the reactor and enters the tertiary high pressure gas-liquid separator 6 .

f. step e three-stage high-pressure gas-liquid separator 6 top gas-phase product enters low-pressure gas-liquid separator 8, substrate liquid-phase product enters four-stage high-pressure gas-liquid separator 7; four-stage high-pressure gas-liquid separator 7 top gas-phase product enters In the low-pressure gas-liquid separator 8, the bottom liquid phase product is pumped to the top of the first-stage tubular reactor 1 through the high-pressure pump 10.

g. In steps b, d, and f, the substances entering the low-pressure gas-liquid separator 8 are separated, and the bottom liquid phase product 14 is used as the raw material for subsequent further processing; the top gas phase product part is used as the external exhaust gas 13, and part is returned as circulating hydrogen.

The raw materials include high-sulfur and high-solids heavy oil and oil-coal slurry, both of which are required to have a sulfur content greater than 2.0w% and a solid content greater than 3%.

A high-pressure gas-liquid separator is installed at the outlet of the first-stage tubular reactor 1, the second-stage tubular reactor 2, and the third-stage tubular reactor 3 to realize the separation of hydrogen sulfide-rich gas and reduce sulfuration in the atmosphere of the hydrogenation reaction system. The hydrogen content can promote the forward progress of the desulfurization reaction and achieve the goal of deep hydrodesulfurization.

The first-stage tubular reactor 1, the second-stage tubular reactor 2, and the third-stage tubular reactor 3 are all raw materials entering from the top of the reactor, and products discharged from the bottom of the reactor.

The top products of the first-stage high-pressure gas-liquid separator 4, the second-stage high-pressure gas-liquid separator 5, and the third-stage high-pressure gas-liquid separator 6 enter the low-pressure gas-liquid separator 8 after mixing; the top gas phase of the fourth-stage high-pressure gas-liquid separator 7 The product enters the low pressure gas-liquid separator 8 . It should be noted that the positions of the two entering the low-pressure gas-liquid separator 8 are different.

The tops of the first-stage tubular reactor 1, the second-stage tubular reactor 2, and the third-stage tubular reactor 3 are all supplemented with new hydrogen.

According to the properties of the circulating material at the bottom of the fourth-stage high-pressure gas-liquid separator 7 and the properties of the product 14 at the bottom of the low-pressure separator, the heavy components in the liquid phase at the bottom of the fourth-stage high-pressure separator 7 can be returned to the first-stage tubular type according to a certain proportion. Reactor 1, secondary tubular reactor 2, and tertiary tubular reactor 3 are further processed.

The bottom of the first-stage tubular reactor 1, the second-stage tubular reactor 2, and the third-stage tubular reactor 3 are all provided with discharge ports to ensure that the coke and sediment accumulated during the reaction process are discharged from the device at any time, ensuring the longevity of the device. Cycle stable operation.

Claims (5)

1. The deep hydrodesulfurization system for the high-sulfur and high-solid heavy oil (coal oil slurry) is characterized by comprising a primary tubular reactor (1), wherein the inlet end of the top of the primary tubular reactor (1) is connected with fresh hydrogen (12) of a fresh hydrogen pipe network, circulating hydrogen compressed by a circulating hydrogen compressor (9), a heavy oil coal oil slurry raw material (11) from a raw material tank area and a mixed raw material consisting of bottom products of a four-stage high-pressure gas-liquid separator (7) pumped by a high-pressure pump;

the output end of the bottom of the first-stage tubular reactor (1) is connected with a first-stage high-pressure gas-liquid separator (4), and a gas-phase product at the top of the first-stage high-pressure gas-liquid separator (4) enters a low-pressure gas-liquid separator (8);

the bottom liquid phase product of the first-stage high-pressure gas-liquid separator (4) and the fresh hydrogen (12) are mixed and input into the input end of the top of the second-stage tubular reactor (2), the bottom reaction product output end of the second-stage tubular reactor (2) is connected with the input end of the second-stage high-pressure gas-liquid separator (5), the top gas phase product output end of the second-stage high-pressure gas-liquid separator (5) is connected with the low-pressure gas-liquid separator (8), the output end of the substrate liquid phase product of the second-stage high-pressure gas-liquid separator (5) is mixed with the fresh hydrogen (12) and then is connected with the input end of the top of the third-stage tubular reactor (3), and the bottom output end of the third-stage tubular reactor (3) is connected with the third-stage high-pressure gas-liquid separator (6);

the output end of the gas-phase product at the top of the three-stage high-pressure gas-liquid separator (6) is connected with the low-pressure gas-liquid separator (8), and the liquid-phase product at the bottom of the three-stage high-pressure gas-liquid separator (6) enters the four-stage high-pressure gas-liquid separator (7); the output end of the gas-phase product at the top of the four-stage high-pressure gas-liquid separator (7) is connected with the low-pressure gas-liquid separator (8), and the liquid-phase product at the bottom is pumped to the top of the first-stage tubular reactor (1) by a high-pressure pump (10);

the bottom of the low-pressure gas-liquid separator (8) is a liquid-phase product (14), the top of the low-pressure gas-liquid separator is a gas-phase product, part of the gas-phase product is used as discharged waste gas (13), and part of the gas-phase product is used as circulating hydrogen to return.

2. The deep hydrodesulfurization system for high-sulfur and high-solid-content heavy oil (coal oil slurry) according to claim 1, wherein the outlets of the primary tubular reactor (1), the secondary tubular reactor (2) and the tertiary tubular reactor (3) are respectively provided with a high-pressure gas-liquid separator.

3. The deep hydrodesulfurization system for high-sulfur and high-solid-content heavy oil (coal oil slurry) according to claim 1, wherein the primary tubular reactor (1), the secondary tubular reactor (2) and the tertiary tubular reactor (3) are all fed with raw materials from the top of the reactors, and products are discharged from the bottom of the reactors.

4. The deep hydrodesulfurization system for high-sulfur and high-solid-content heavy oil (coal oil slurry) according to claim 1, wherein fresh hydrogen is supplemented to the tops of the primary tubular reactor (1), the secondary tubular reactor (2) and the tertiary tubular reactor (3).

5. The deep hydrodesulfurization system for high-sulfur and high-solid-content heavy oil (coal oil slurry) according to claim 1, wherein discharge ports are formed at the bottoms of the primary tubular reactor (1), the secondary tubular reactor (2) and the tertiary tubular reactor (3).

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