CN216337451U - High-sulfur high-solid heavy oil (oil coal slurry) deep hydrodesulfurization system - Google Patents
High-sulfur high-solid heavy oil (oil coal slurry) deep hydrodesulfurization system Download PDFInfo
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- CN216337451U CN216337451U CN202122978768.4U CN202122978768U CN216337451U CN 216337451 U CN216337451 U CN 216337451U CN 202122978768 U CN202122978768 U CN 202122978768U CN 216337451 U CN216337451 U CN 216337451U
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Abstract
The utility model discloses a high-sulfur high-solid-content heavy oil (coal oil slurry) deep hydrodesulfurization system, wherein high-sulfur high-solid-content heavy oil, heavy products at the bottom of a four-stage high-pressure gas-liquid separator, new hydrogen and circulating hydrogen are mixed, the four products jointly enter a primary tubular reactor from the top, the products are divided into a gas phase and a liquid phase through the primary high-pressure gas-liquid separator, the gas phase products enter a low-pressure gas-liquid separator, and the liquid phase products are used as raw materials of the secondary tubular reactor; the product of the two-stage tubular reactor enters a two-stage high-pressure gas-liquid separator, the gas-phase product enters a low-pressure gas-liquid separator, and the liquid-phase product is used as the raw material of the three-stage tubular reactor; the product of the three-stage tubular reactor enters a three-stage high-pressure gas-liquid separator, the gas-phase product enters a low-pressure gas-liquid separator, and the liquid-phase product enters a four-stage high-pressure gas-liquid separator for further separation; the top product of the low-pressure separator is partially discharged outside, part of the top product is used as recycle hydrogen, and the bottom product is used as a raw material for subsequent further processing. The utility model improves the efficiency of hydrogenation reaction and hydrodesulfurization.
Description
Technical Field
The utility model relates to the technical field of petrochemical industry, in particular to a deep hydrodesulfurization system for high-sulfur high-solid heavy oil (coal oil slurry).
Background
The high-sulfur high-solid heavy oil coal oil slurry has great influence on the long-term stable operation of the device due to high sulfur and other non-hydrocarbon impurities, high solid content and the like, and is not easy to deeply desulfurize the high-sulfur high-solid heavy oil coal oil slurry.
Firstly, the high-sulfur high-solid heavy oil coal slurry enters a reaction system in the form of hydrogen sulfide after sulfur elements are removed in a hydrocracking process because of high sulfur content. In the prior art system, the impurity gases such as hydrogen sulfide are always present in the reaction system during the whole reaction process, and are not discharged from the separation system until the whole reaction is finished. The existence of a large amount of impurity gases such as hydrogen sulfide and the like can cause certain influence on the reaction, and on one hand, the hydrogen partial pressure can be obviously reduced, and the hydrogenation reaction is restricted; on the other hand, from the viewpoint of chemical equilibrium, the presence of excessive hydrogen sulfide inhibits the forward progress of the reaction of hydrodesulfurization to produce hydrogen sulfide, and affects the desulfurization efficiency.
Secondly, the high-sulfur high-solid heavy oil coal slurry has high solid content, and the high solid content means a large amount of coke-forming centers. The high-sulfur high-solid heavy oil coal slurry contains a large amount of coke-forming components such as colloid asphaltene and the like, and is superimposed with high solid content, so that the generation of coke is further promoted, and the long-period stable operation of the device is influenced.
In view of the above, there is a need for improvement in tubular reactor hydrodesulfurization technology to increase the efficiency of the hydrogenation reaction and hydrodesulfurization.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model aims to provide a high-sulfur high-solid-content heavy oil (coal oil slurry) deep hydrodesulfurization system, wherein a one-stage reactor is optimized to be a tubular reactor with three stages connected in series, and a high-pressure gas-liquid separator is arranged at the outlet of each stage of reactor, so that excessive hydrogen sulfide gas and impurities generated by each stage of tubular reactor are discharged out of a reaction system, and meanwhile, new hydrogen is supplemented at the inlet of each stage of tubular reactor, the content of impurity gases such as hydrogen sulfide is further reduced, the hydrogen partial pressure is improved, the continuous forward progress of hydrodesulfurization reaction is promoted, and the purpose of deep hydrodesulfurization is achieved; in addition, the tubular reactor adopts a form of 'top-in bottom-out', so that the retention of raw materials in the reactor is shortened, the back mixing is reduced, and the coke formation probability is reduced; and finally, arranging a discharge port at the bottom of each reactor, so that deposits easy to coke formation and part of coke are discharged out of the system, further reducing the coke formation probability and prolonging the operation period of the device.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a high-sulfur high-solid heavy oil (coal oil slurry) deep hydrodesulfurization system comprises a primary tubular reactor 1, wherein the inlet end of the top of the primary tubular reactor 1 is connected with a mixed raw material consisting of 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 bottom product of a four-stage high-pressure gas-liquid separator 7 pumped by a high-pressure pump;
the output end at the bottom of the primary tubular reactor 1 is connected with a primary high-pressure gas-liquid separator 4, and a gas-phase product at the top of the primary 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 at 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 substrate liquid phase product output end of the second-stage high-pressure gas-liquid separator 5 and the fresh hydrogen 12 are mixed and then connected with the input end at 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 gas-phase product output end 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 gas-phase product output end 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 an exhaust gas 13, and part of the gas-phase product is used as circulating hydrogen to return.
And the outlets of the first-stage tubular reactor 1, the second-stage tubular reactor 2 and the third-stage tubular reactor 3 are respectively provided with a high-pressure gas-liquid separator.
The primary tubular reactor 1, the secondary tubular reactor 2 and the tertiary tubular reactor 3 are all raw materials which enter from the top of the reactors, and products are discharged from the bottom of the reactors.
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 are mixed and then enter a low-pressure gas-liquid separator 8; and the gas-phase product at the top of the four-stage high-pressure gas-liquid separator 7 enters a low-pressure gas-liquid separator 8.
And the tops of the first-stage tubular reactor 1, the second-stage tubular reactor 2 and the third-stage tubular reactor 3 are all provided with supplementary fresh 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 utility model has the beneficial effects that:
according to the utility model, the high-pressure gas-liquid separators are arranged at the outlets of the tubular reactors at all levels, so that the gas rich in hydrogen sulfide is discharged out of the reaction system, the inhibition effect of the hydrogen sulfide in the gas-phase product on the hydrodesulfurization reaction is effectively reduced, the degree of the hydrodesulfurization reaction is improved, and the purpose of deep hydrodesulfurization is achieved; in addition, in the utility model, the property that the high-sulfur and high-solid heavy oil (oil coal slurry) is easy to coke is considered, the feeding mode is adjusted to be feeding from the top of each stage of tubular reactor, the retention time of materials is reduced, and the probability of coke formation is reduced; and finally, adjusting the circulation quantity of the circulating material at the bottom of the four-stage high-pressure gas-liquid separator and the circulation proportion of each reactor according to the property of the circulating material at the bottom of the four-stage high-pressure gas-liquid separator and the property requirement of a product at the bottom of the low-pressure separator.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a deep hydrodesulfurization system for high-sulfur and high-solid heavy oil (coal oil slurry) comprises the following steps:
a. fresh hydrogen 12 from a fresh hydrogen pipe network, circulating hydrogen compressed by a circulating hydrogen compressor 9, a heavy oil coal slurry raw material 11 from a raw material tank area and a bottom product of a four-stage high-pressure gas-liquid separator 7 pumped by a high-pressure pump form a mixed raw material, and the mixed raw material enters the top of a primary tubular reactor 1 to undergo a hydrocracking reaction;
b. b, allowing a product obtained after the hydrocracking reaction in the step a to flow out from the bottom of the primary tubular reactor 1 and enter a primary high-pressure gas-liquid separator 4, allowing a gas-phase product at the top of the primary high-pressure gas-liquid separator 4 to enter a low-pressure gas-liquid separator 8, and allowing a substrate liquid-phase product to serve as a raw material of the secondary tubular reactor 2;
c. b, mixing a liquid phase product at the bottom of the first-stage high-pressure gas-liquid separator 4 with new hydrogen 12 to serve as a raw material of the secondary tubular reactor 2, and discharging a reaction product from the bottom of the reactor to enter a second-stage high-pressure gas-liquid separator 5.
d. C, enabling a gas-phase product at the top of the second-stage high-pressure gas-liquid separator 5 to enter a low-pressure gas-liquid separator 8, and taking a substrate liquid-phase product as a raw material of the three-stage tubular reactor 3;
e. d, mixing the substrate liquid phase product of the second-stage high-pressure gas-liquid separator 5 with new hydrogen 12 to be used as a raw material of the three-stage tubular reactor 3, and discharging the reaction product from the bottom of the reactor to enter the third-stage high-pressure gas-liquid separator 6.
f. Step e, the gas-phase product at the top of the three-stage high-pressure gas-liquid separator 6 enters a low-pressure gas-liquid separator 8, and the liquid-phase product of the substrate enters a four-stage high-pressure gas-liquid separator 7; and the gas-phase product at the top of the four-stage high-pressure gas-liquid separator 7 enters a 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.
g. In the steps b, d and f, the substances entering the low-pressure gas-liquid separator 8 are separated, and a bottom liquid-phase product 14 is used as a raw material for subsequent further processing; the top gas phase product is partly returned as export gas 13 and partly as recycle hydrogen.
The raw materials comprise high-sulfur high-solid heavy oil and oil coal slurry, wherein the sulfur content of the high-sulfur high-solid heavy oil and the oil coal slurry is required to be more than 2.0 w%, and the solid content of the high-sulfur high-solid heavy oil and the oil coal slurry is required to be more than 3%.
The outlets of the first-stage tubular reactor 1, the second-stage tubular reactor 2 and the third-stage tubular reactor 3 are respectively provided with a high-pressure gas-liquid separator, so that the separation of hydrogen sulfide gas is realized, the hydrogen sulfide content in the atmosphere of a hydrogenation reaction system is reduced, the forward proceeding of a desulfurization reaction is promoted, and the goal of deep hydrodesulfurization is reached.
The primary tubular reactor 1, the secondary tubular reactor 2 and the tertiary tubular reactor 3 are all raw materials which enter from the top of the reactors, and products are discharged from the bottom of the reactors.
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 are mixed and then enter a low-pressure gas-liquid separator 8; and the gas-phase product at the top of the four-stage high-pressure gas-liquid separator 7 enters a low-pressure gas-liquid separator 8. It should be noted that the two locations of entry into the low pressure gas-liquid separator 8 are different.
And the tops of the first-stage tubular reactor 1, the second-stage tubular reactor 2 and the third-stage tubular reactor 3 are all provided with supplementary fresh hydrogen.
According to the property of the circulating material at the bottom of the four-stage high-pressure gas-liquid separator 7 and the property requirement of the product 14 at the bottom of the low-pressure separator, the heavy component of the liquid phase at the bottom of the four-stage high-pressure separator 7 can be respectively returned to the first-stage tubular reactor 1, the second-stage tubular reactor 2 and the third-stage tubular reactor 3 according to a certain proportion for further deep processing.
The bottoms of the first-stage tubular reactor 1, the second-stage tubular reactor 2 and the third-stage tubular reactor 3 are respectively provided with a discharge outlet, so that the device for discharging accumulated coked substances and sediments in the reaction process at any time is ensured, and the long-period stable operation of the device is ensured.
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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| CN202122978768.4U CN216337451U (en) | 2021-11-30 | 2021-11-30 | High-sulfur high-solid heavy oil (oil coal slurry) deep hydrodesulfurization system |
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| CN202122978768.4U CN216337451U (en) | 2021-11-30 | 2021-11-30 | High-sulfur high-solid heavy oil (oil coal slurry) deep hydrodesulfurization system |
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