Hydrocarbon synthesis gas utilization system

Abstract

The invention discloses a hydrocarbon synthesis gas utilization system, comprising an intelligently controlled hydrocarbon pretreatment component and a hydrocarbon utilization component. The hydrocarbon synthesis gas utilization system firstly can be applied to both high-pressure and medium-pressure hydrocarbon synthesis gases. Secondly, the medium-pressure hydrocarbon synthesis gas is sent to a hydrocarbon conversion device for adjusting the hydrocarbon ratio, and then sent to a pressure energy exchange device for pressure energy exchange. The obtained hydrocarbon synthesis gas directly enters a secondary reduction shaft furnace as a reducing agent, thereby directly obtaining a high-purity iron product. Furthermore, the raw materials of the primary reduction shaft furnace enter the secondary reduction shaft furnace after primary reduction treatment, providing support for the secondary reduction shaft furnace to obtain high-purity products. At the same time, the system is also coupled with a high-clean power generation device and a carbon dioxide recovery device to fully utilize the tail gas generated by the primary reduction shaft furnace, thereby improving the utilization value of the hydrocarbon synthesis gas, reducing the system cost, and improving favorable conditions for promoting gas-based reduced iron in China.

Description

Technical Field

[0001] The invention relates to a hydrocarbon synthesis gas utilization system. Background Art

[0002] People's expectations for a better life are getting higher and higher, and international concerns about resources are becoming increasingly serious. Countries are united in actively researching and developing new resources and energy on the one hand, and improving the utilization rate and cleanliness of resources by improving technology on the other. Our country is a major coal consumer. One of the most environmentally friendly ways of utilization is coal gasification, which is a way to cleanly transform resources from the source. The processes developed in China, such as direct coal liquefaction to oil, indirect liquefaction to oil, coal to methanol, and coal to ethylene glycol, are all single forms. We all know that it is impossible to absorb heat from a single heat source and turn it into useful work without causing other effects. Therefore, if the energy consumption of a single system cannot be reduced, there is no way to talk about high efficiency. For example: in the process of coal gasification, carbon will not be 100% converted into synthesis gas, and a large amount of heat will be released during the conversion process. At present, heat recovery technology has become nearly 100% recoverable, but for a single system, heat cannot be fully and effectively utilized, because resources need to be circulated and compressed in a single system, which will consume additional energy, thereby reducing the utilization efficiency of hydrocarbon synthesis gas. Summary of the invention

[0003] In order to overcome the above-mentioned defects, the present invention provides a hydrocarbon synthesis gas utilization system, which changes the traditional single system, eliminates a large number of energy-consuming units in the single system, and integrates related modules through temperature and pressure matching coupling, so as to improve the effective utilization of hydrocarbon synthesis gas to a new level.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A hydrocarbon synthesis gas utilization system includes an intelligently controlled hydrocarbon pretreatment component and a hydrocarbon utilization component, wherein:

[0006] The hydrocarbon pretreatment assembly comprises a one-pass synthesis device for converting high-pressure hydrocarbon synthesis gas into medium-pressure hydrocarbon synthesis gas and a hydrocarbon conversion device for changing hydrocarbon components of the hydrocarbon synthesis gas, the one-pass synthesis device is provided with a high-pressure hydrocarbon synthesis gas inlet and a medium-pressure hydrocarbon synthesis gas outlet, the hydrocarbon conversion device is provided with a first medium-pressure hydrocarbon synthesis gas inlet, a second medium-pressure hydrocarbon synthesis gas inlet and a conversion gas outlet, the medium-pressure hydrocarbon synthesis gas outlet of the one-pass synthesis device is connected to the second medium-pressure hydrocarbon synthesis gas inlet of the hydrocarbon conversion device;

[0007] The hydrocarbon utilization assembly includes a pressure energy exchange device, a primary reduction shaft furnace, a secondary reduction shaft furnace, an ultra-clean power generation device and a carbon dioxide recovery device. The pressure energy exchange device has a first exchange inlet, a second exchange inlet, a first exchange outlet and a second exchange outlet. The first exchange inlet and the first exchange outlet are correspondingly arranged, and the second exchange inlet and the second exchange outlet are correspondingly arranged.

[0008] The primary reduction vertical furnace has a material input port, a first primary reduction furnace inlet, a first primary reduction furnace outlet, and a second primary reduction furnace outlet, and the secondary reduction vertical furnace has a first secondary reduction furnace inlet, a first secondary reduction furnace outlet, a second secondary reduction furnace inlet, and a product outlet;

[0009] The conversion gas output port of the hydrocarbon conversion device is connected to the first exchange inlet of the pressure energy exchange device, the first exchange outlet of the pressure energy exchange device is connected to the second secondary reduction furnace inlet of the secondary reduction shaft furnace, the first secondary reduction furnace outlet of the secondary reduction shaft furnace is connected to the second exchange inlet of the pressure energy exchange device, the second exchange outlet of the pressure energy exchange device is connected to the first primary reduction furnace inlet of the primary reduction shaft furnace, and the first primary reduction furnace outlet of the primary reduction shaft furnace is connected to the first secondary reduction furnace inlet of the secondary reduction shaft furnace;

[0010] The reduction furnace tail gas generated by the primary reduction vertical furnace is connected to the inlet of the ultra-clean power generation device through the outlet of the second primary reduction furnace, and the outlet of the ultra-clean power generation device is connected to the carbon dioxide recovery device.

[0011] As a further improvement of the present invention, the one-pass synthesis device includes a synthesis component and a pressure reduction component.

[0012] As a further improvement of the present invention, the pressure energy exchange device includes a turbine and a compressor connected as a whole via a rotating shaft.

[0013] As a further improvement of the present invention, the hydrocarbon pretreatment component and the hydrocarbon utilization component are intelligently controlled by a resource allocation system with a controller.

[0014] As a further improvement of the present invention, the primary reduction vertical furnace and the secondary reduction vertical furnace are used in series, the product reduced iron of the primary reduction vertical furnace enters into the secondary reduction vertical furnace through the first primary reduction furnace outlet and the first secondary reduction furnace inlet and serves as a raw material for the secondary reduction vertical furnace, and the tail gas of the secondary reduction vertical furnace enters into the pressure energy exchange device through the first secondary reduction furnace outlet and the second exchange inlet for pressure energy exchange, and then enters into the primary reduction vertical furnace through the second exchange outlet and the first primary reduction furnace inlet as a reducing agent for the primary reduction vertical furnace.

[0015] The beneficial effects of the present invention are as follows: the hydrocarbon synthesis gas utilization system is firstly provided with a one-pass synthesis device, and the high-pressure hydrocarbon synthesis gas is converted into medium-pressure hydrocarbon synthesis gas after isobaric utilization once, so that both high-pressure and medium-pressure hydrocarbon synthesis gases can be applied to the system; secondly, the medium-pressure hydrocarbon synthesis gas is sent to the hydrocarbon conversion device for adjusting the carbon-hydrogen ratio, and then sent to the pressure energy exchange device for pressure energy exchange treatment, and the obtained hydrocarbon synthesis gas directly enters the secondary reduction shaft furnace as a reducing agent, thereby directly obtaining a high-purity iron product; furthermore, the raw materials of the primary reduction shaft furnace are sent to the secondary reduction shaft furnace after the primary reduction treatment, which provides support for the secondary reduction shaft furnace to obtain high-purity products. At the same time, the system is also coupled with a high-clean power generation device and a carbon dioxide recovery device to fully utilize the tail gas generated by the primary reduction shaft furnace, thereby improving the utilization value of the hydrocarbon synthesis gas, reducing the system cost, and improving favorable conditions for promoting gas-based reduced iron in China. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structural principle of the present invention.

[0017] Combined with the accompanying drawings, the following description is given:

[0018] 1——Carbon-hydrogen pretreatment component; 2——Carbon-hydrogen utilization component;

[0019] 11 - once-through synthesis unit; 12 - hydrocarbon conversion unit;

[0020] 111——Synthesis component; 112——Depression component;

[0021] 11A——High-pressure hydrocarbon synthesis gas inlet;

[0022] 11B——Medium-pressure hydrocarbon synthesis gas output port;

[0023] 12A——first medium-pressure hydrocarbon synthesis gas input port;

[0024] 12B——second medium-pressure hydrocarbon synthesis gas input port;

[0025] 12C——conversion gas output port;

[0026] 21 – pressure energy exchange device;

[0027] 21A – first exchange entrance;

[0028] 21B – Second exchange entrance;

[0029] 21C – First exchange exit;

[0030] 21D – Second exchange exit;

[0031] 22 – primary reduction shaft furnace;

[0032] 22A——Material input port;

[0033] 22B – Entrance to the first primary reduction furnace;

[0034] 22C – Exit of the first primary reduction furnace;

[0035] 22D - the exit of the second primary reduction furnace;

[0036] 23 – secondary reduction shaft furnace;

[0037] 23A – entrance to the first and second reduction furnaces;

[0038] 23B——Exit of the first and second reduction furnaces;

[0039] 23C – entrance to the second secondary reduction furnace;

[0040] 23D——Product export;

[0041] 24——Ultra-clean power generation device;

[0042] 25 – Carbon dioxide recovery device;

[0043] 100——High-pressure hydrocarbon synthesis gas;

[0044] 200——Medium pressure hydrocarbon synthesis gas;

[0045] 300——Reduction furnace exhaust gas. DETAILED DESCRIPTION

[0046] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0047] See also Figure 1 , is a hydrocarbon synthesis gas utilization system according to the present invention, comprising an intelligently controlled hydrocarbon pretreatment component 1 and a hydrocarbon utilization component 2, wherein:

[0048] The hydrocarbon pretreatment assembly 1 comprises a one-pass synthesis device 11 for converting high-pressure hydrocarbon synthesis gas into medium-pressure hydrocarbon synthesis gas and a hydrocarbon conversion device 12 for changing the carbon-hydrogen ratio of the hydrocarbon synthesis gas. The one-pass synthesis device 11 is provided with a high-pressure hydrocarbon synthesis gas inlet 11A and a medium-pressure hydrocarbon synthesis gas outlet 11B. The hydrocarbon conversion device 12 is provided with a first medium-pressure hydrocarbon synthesis gas inlet 12A, a second medium-pressure hydrocarbon synthesis gas inlet 12B and a conversion gas outlet 12C. The medium-pressure hydrocarbon synthesis gas outlet 11B of the one-pass synthesis device 11 is connected to the second medium-pressure hydrocarbon synthesis gas inlet 12B of the hydrocarbon conversion device 12.

[0049] The hydrocarbon utilization assembly 2 includes a pressure energy exchange device 21, a primary reduction shaft furnace 22, a secondary reduction shaft furnace 23, an ultra-clean power generation device 24 and a carbon dioxide recovery device 25. The pressure energy exchange device 21 has a first exchange inlet 21A, a second exchange inlet 21B, a first exchange outlet 21C and a second exchange outlet 21D. The first exchange inlet 21A and the first exchange outlet 21C are correspondingly arranged, and the second exchange inlet 21B and the second exchange outlet 21D are correspondingly arranged.

[0050] The primary reduction vertical furnace 22 has a material input port 22A, a first primary reduction furnace inlet 22B, a first primary reduction furnace outlet 22C, and a second primary reduction furnace outlet 22D, and the secondary reduction vertical furnace 23 has a first secondary reduction furnace inlet 23A, a first secondary reduction furnace outlet 23B, a second secondary reduction furnace inlet 23C, and a product outlet 23D;

[0051] The conversion gas output port 12C of the hydrocarbon conversion device 12 is connected to the first exchange inlet 21A of the pressure energy exchange device 21, the first exchange outlet 21C of the pressure energy exchange device 21 is connected to the second secondary reduction furnace inlet 23C of the secondary reduction shaft furnace 23, the first secondary reduction furnace outlet 23B of the secondary reduction shaft furnace 23 is connected to the second exchange inlet 21B of the pressure energy exchange device 21, the second exchange outlet of the pressure energy exchange device 21 is connected to the first primary reduction furnace inlet 22B of the primary reduction shaft furnace 22, and the first primary reduction furnace outlet 22C of the primary reduction shaft furnace 22 is connected to the first secondary reduction furnace inlet 23A of the secondary reduction shaft furnace 23;

[0052] The reduction furnace tail gas 300 generated by the primary reduction vertical furnace 22 is connected to the inlet of the ultra-clean power generation device 24 through the second primary reduction furnace outlet 22D, and the outlet of the ultra-clean power generation device 24 is connected to the carbon dioxide recovery device 25 .

[0053] In addition, the one-pass synthesis device includes a synthesis component 111 and a pressure reduction component 112, the pressure energy exchange device includes a turbine and a compressor connected as a whole through a rotating shaft, and the hydrocarbon pretreatment component 1 and the hydrocarbon utilization component 2 are intelligently controlled through a resource allocation system with a controller.

[0054] The working principle and workflow of the present invention are as follows:

[0055] First, if it is high-pressure hydrocarbon synthesis gas 100, it enters the synthesis device 11 through the high-pressure hydrocarbon synthesis gas inlet 11A for pressure reduction treatment to obtain medium-pressure hydrocarbon synthesis gas 200, and enters the hydrocarbon conversion device 12 through the medium-pressure hydrocarbon synthesis gas outlet 11B and the second medium-pressure hydrocarbon synthesis gas inlet 12B. If it is medium-pressure hydrocarbon synthesis gas 200, it directly enters the hydrocarbon conversion device 12 through the first medium-pressure hydrocarbon synthesis gas inlet 12A.

[0056] Secondly, the medium-pressure hydrocarbon synthesis gas 200 entering the hydrocarbon conversion device 12 is subjected to conversion treatment in the hydrocarbon conversion device, such as adjustment of the carbon-hydrogen ratio, etc. The hydrocarbon synthesis gas after the conversion treatment enters the pressure energy exchange device 21 through the conversion gas output port 12C and the first exchange inlet 21A for pressure energy exchange treatment, and then enters the secondary reduction vertical furnace 23 through the first exchange outlet 21C and the second secondary reduction furnace inlet 23C.

[0057] The raw material pellets are fed into the primary reduction shaft furnace 22 through the material feeding port 22A for primary reduction treatment, the product reduced iron of the primary reduction shaft furnace enters the secondary reduction shaft furnace 23 through the first primary reduction furnace outlet 22C and the first secondary reduction furnace inlet 23A and serves as the raw material of the secondary reduction shaft furnace 23, the tail gas of the secondary reduction shaft furnace 23 enters the pressure energy exchange device 21 through the first secondary reduction furnace outlet 23B and the second exchange inlet 21B for pressure energy exchange, and then enters the primary reduction shaft furnace 22 through the second exchange outlet 21D and the first primary reduction furnace inlet 22B as the reducing agent of the primary reduction shaft furnace 22.

[0058] In addition, after the hydrocarbon synthesis gas treated by the pressure energy exchange device enters the secondary reduction shaft furnace 23 through the first exchange outlet 21C and the second secondary reduction furnace inlet 23C, it can reduce the raw materials of the secondary reduction shaft furnace 23 to obtain high-purity iron. The reduction furnace tail gas generated by the primary reduction shaft furnace 22 enters the ultra-clean power generation device to generate electricity, and the tail gas generated at the same time is passed into the carbon dioxide recovery device to obtain dry ice and other recyclables.

[0059] It can be seen that the hydrocarbon synthesis gas utilization system firstly sets up a one-pass synthesis device, and converts the high-pressure hydrocarbon synthesis gas into medium-pressure hydrocarbon synthesis gas after isobaric utilization once, so that both high-pressure and medium-pressure hydrocarbon synthesis gases can be used in this system; secondly, the medium-pressure hydrocarbon synthesis gas is sent to the hydrocarbon conversion device for adjustment of the carbon-hydrogen ratio, and then sent to the pressure energy exchange device for pressure energy exchange treatment, and the obtained hydrocarbon synthesis gas directly enters the secondary reduction vertical furnace as a reducing agent, thereby directly obtaining a high-purity high-purity iron product; furthermore, the raw materials of the primary reduction vertical furnace enter the secondary reduction vertical furnace after a primary reduction treatment, providing support for the secondary reduction vertical furnace to obtain high-purity products. At the same time, the system is also coupled with a high-clean power generation device and a carbon dioxide recovery device to fully utilize the tail gas generated by the primary reduction vertical furnace, thereby improving the utilization value of the hydrocarbon synthesis gas, reducing the system cost, and improving favorable conditions for the domestic promotion of gas-based reduced iron.

[0060] Many specific details are described in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited to the specific implementation disclosed above. At the same time, any person familiar with the art can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A hydrocarbon synthesis gas utilization system, characterized in that: The invention comprises an intelligently controlled hydrocarbon pretreatment component (1) and a hydrocarbon utilization component (2), wherein: The hydrocarbon pretreatment component (1) comprises a one-pass synthesis device (11) for converting high-pressure hydrocarbon synthesis gas into medium-pressure hydrocarbon synthesis gas and a hydrocarbon conversion device (12) for changing the hydrocarbon components of the hydrocarbon synthesis gas, the one-pass synthesis device (11) being provided with a high-pressure hydrocarbon synthesis gas inlet (11A) and a medium-pressure hydrocarbon synthesis gas outlet (11B), the hydrocarbon conversion device (12) being provided with a first medium-pressure hydrocarbon synthesis gas inlet (12A), a second medium-pressure hydrocarbon synthesis gas inlet (12B) and a conversion gas outlet (12C), the medium-pressure hydrocarbon synthesis gas outlet (11B) of the one-pass synthesis device (11) being connected to the second medium-pressure hydrocarbon synthesis gas inlet (12B) of the hydrocarbon conversion device (12); The hydrocarbon utilization component (2) comprises a pressure energy exchange device (21), a primary reduction shaft furnace (22), a secondary reduction shaft furnace (23), an ultra-clean power generation device (24) and a carbon dioxide recovery device (25), wherein the pressure energy exchange device (21) has a first exchange inlet (21A), a second exchange inlet (21B), a first exchange outlet (21C) and a second exchange outlet (21D), wherein the first exchange inlet (21A) and the first exchange outlet (21C) are arranged correspondingly, and the second exchange inlet (21B) and the second exchange outlet (21D) are arranged correspondingly; The primary reduction vertical furnace (22) has a material input port (22A), a first primary reduction furnace inlet (22B), a first primary reduction furnace outlet (22C) and a second primary reduction furnace outlet (22D); the secondary reduction vertical furnace (23) has a first secondary reduction furnace inlet (23A), a first secondary reduction furnace outlet (23B), a second secondary reduction furnace inlet (23C) and a product outlet (23D); The conversion gas output port (12C) of the hydrocarbon conversion device (12) is connected to the first exchange inlet (21A) of the pressure energy exchange device (21), the first exchange outlet (21C) of the pressure energy exchange device (21) is connected to the second secondary reduction furnace inlet (23C) of the secondary reduction shaft furnace (23), the first secondary reduction furnace outlet (23B) of the secondary reduction shaft furnace (23) is connected to the second exchange inlet (21B) of the pressure energy exchange device (21), the second exchange outlet of the pressure energy exchange device (21) is connected to the first primary reduction furnace inlet (22B) of the primary reduction shaft furnace (22), and the first primary reduction furnace outlet (22C) of the primary reduction shaft furnace (22) is connected to the first secondary reduction furnace inlet (23A) of the secondary reduction shaft furnace (23); The reduction furnace tail gas (300) generated by the primary reduction shaft furnace (22) is connected to the inlet of the ultra-clean power generation device (24) through the second primary reduction furnace outlet (22D), and the outlet of the ultra-clean power generation device (24) is connected to the carbon dioxide recovery device (25); The one-pass synthesis device comprises a synthesis component (111) and a pressure reduction component (112), and the pressure energy exchange device comprises a turbine and a compressor connected as a whole via a rotating shaft.

2. The hydrocarbon synthesis gas utilization system according to claim 1, characterized in that: The hydrocarbon pretreatment component (1) and the hydrocarbon utilization component (2) are intelligently controlled through a resource allocation system with a controller.

3. The hydrocarbon synthesis gas utilization system according to claim 1, characterized in that: The primary reduction shaft furnace (22) and the secondary reduction shaft furnace (23) are used in series. The reduced iron product of the primary reduction shaft furnace enters the secondary reduction shaft furnace (23) through the first primary reduction furnace outlet (22C) and the first secondary reduction furnace inlet (23A) and serves as a raw material for the secondary reduction shaft furnace (23). The tail gas of the secondary reduction shaft furnace (23) enters the pressure energy exchange device (21) through the first secondary reduction furnace outlet (23B) and the second exchange inlet (21B) to exchange pressure energy and then enters the primary reduction shaft furnace (22) through the second exchange outlet (21D) and the first primary reduction furnace inlet (22B) to serve as a reducing agent for the primary reduction shaft furnace (22).

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