A device for warming up COS hydrolyzer before overall start of IGCC and its working method

Abstract

The present application belongs to the technical field of coal chemical industry, and relates to a device for warming up a COS hydrolyzer before overall starting of an IGCC and a working method thereof. The device comprises a gasification high-pressure stable nitrogen pipe network, a coal gasification device, a synthetic gas out-gasification boundary hand valve, a heater and a COS hydrolyzer connected in sequence on the gasification high-pressure stable nitrogen pipe network, the synthetic gas out-gasification boundary hand valve and the heater being communicated with the gasification high-pressure discharge nitrogen pipe network through a nitrogen pipeline, and the heater being used for heating nitrogen entering the COS hydrolyzer. A high-pressure nitrogen hand valve is arranged on the nitrogen pipeline, and the high-pressure nitrogen hand valve is used for controlling on-off of the nitrogen pipeline. The present application can realize warming up of a COS hydrolyzer of a purification unit of an IGCC, does not occupy high-pressure stable nitrogen of a gasification unit any more, does not affect related users of the high-pressure stable nitrogen of the gasification unit any more, adds a nitrogen pipeline to provide nitrogen to the COS hydrolyzer, avoids that the gasification high-pressure stable nitrogen pipe network provides nitrogen to the heater and the COS hydrolyzer, reduces consumption of nitrogen, and has certain economic benefits.

Description

Technical Field

[0001] This invention belongs to the field of coal chemical technology and relates to a device and its working method for heating the COS hydrolyzer before the overall start-up of IGCC. Background Technology

[0002] The IGCC purification unit is equipped with a COS hydrolyzer to hydrolyze the COS in the syngas produced by the coal gasification unit into acidic gases such as H2S, which are then introduced into an absorption tower for the removal of acidic gases from the syngas. The packing material in the COS hydrolyzer cannot come into contact with air or water, and it requires a temperature of 160-180℃ to successfully hydrolyze the COS. Therefore, the COS hydrolyzer needs to be preheated to 160℃ with hot nitrogen before the entire IGCC unit is started. Currently, preheating the COS hydrolyzer requires opening the valve for high-pressure stable nitrogen to enter the coal gasification unit, injecting high-pressure nitrogen into the gasification unit through the stable high-pressure nitrogen pipeline network, and opening the manual valve for the syngas exiting the gasification zone to heat the high-pressure nitrogen before introducing it into the COS hydrolyzer in the purification unit. In the early stages of IGCC unit startup, due to the large number of high-pressure nitrogen users in the coal gasification unit, excessive nitrogen will be consumed. That is, nitrogen will be directly supplied to the heater and COS hydrolyzer through the gasification high-pressure stable nitrogen pipeline network, resulting in additional nitrogen consumption. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention aims to provide a device and its operating method for heating the COS hydrolyzer before the overall startup of an IGCC (Integrated Gasification Control Unit). This invention enables the heating of the COS hydrolyzer in the IGCC purification unit, eliminating the need for a stable nitrogen pipeline network from the gasification unit to inject high-pressure nitrogen into the coal gasification unit. This also avoids impacting users of the high-pressure stable nitrogen supply for the coal gasification unit. Furthermore, by adding a nitrogen pipeline to supply nitrogen to the COS hydrolyzer, the consumption of high-pressure nitrogen can be reduced, resulting in certain economic benefits.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] This invention discloses a device for heating the COS hydrolyzer before the overall startup of an IGCC, comprising a gasification high-pressure stable nitrogen pipeline network, on which a syngas outlet gasification boundary manual valve, a heater, and a COS hydrolyzer are sequentially connected. The syngas outlet gasification boundary manual valve and the heater are connected to the gasification high-pressure discharge nitrogen pipeline network via a nitrogen pipeline, and a high-pressure nitrogen manual valve is provided on the nitrogen pipeline.

[0006] Furthermore, a check valve is installed on the nitrogen pipeline.

[0007] Furthermore, the check valve is located between the high-pressure nitrogen manual valve and the gasification high-pressure discharge nitrogen pipeline.

[0008] Furthermore, a pressure regulating valve is installed on the nitrogen pipeline.

[0009] Furthermore, the pressure regulating valve is located between the check valve and the gasification high-pressure discharge nitrogen pipeline.

[0010] Furthermore, a nitrogen pipeline bypass is provided on the nitrogen pipeline, which is connected to the atmosphere, and a pressure safety valve is provided on the nitrogen pipeline bypass.

[0011] Furthermore, the nitrogen pipeline bypass is located between the check valve and the pressure regulating valve.

[0012] Furthermore, a pressure gauge is installed on the nitrogen pipeline, located between the nitrogen pipeline bypass and the pressure regulating valve.

[0013] Furthermore, a coal gasification device is installed between the gasification high-pressure stable nitrogen pipeline network and the manual valve at the syngas outlet gasification zone, and a high-pressure stable nitrogen inlet valve is installed between the gasification high-pressure stable nitrogen pipeline network and the coal gasification device.

[0014] Based on the above structure, the present invention also discloses a method for operating a device for heating the COS hydrolyzer before the overall startup of an IGCC, comprising the following steps:

[0015] During the heating of the COS hydrolyzer by the heater, the manual valve of the syngas outlet gasification zone on the high-pressure stable nitrogen pipeline is closed, and the high-pressure nitrogen manual valve is opened. The high-pressure nitrogen pipeline then supplies nitrogen to the COS hydrolyzer through the nitrogen pipeline.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This invention includes a gasification high-pressure stabilized nitrogen pipeline network. A syngas outlet gasification boundary manual valve, a heater, and a COS hydrolyzer are sequentially connected to this network. The syngas outlet gasification boundary manual valve controls the on / off connection between the gasification high-pressure stabilized nitrogen pipeline network and the heater. The heater heats the nitrogen entering the COS hydrolyzer. The gasification high-pressure discharge nitrogen pipeline network supplies nitrogen to the heater and the COS hydrolyzer. A high-pressure nitrogen manual valve is installed on the nitrogen pipeline to control the on / off connection of the nitrogen pipeline. This invention enables the COS hydrolyzer in the IGCC purification unit to be heated without occupying the high-pressure stabilized nitrogen of the gasification unit. It also eliminates the need for the gasification unit's stabilized nitrogen pipeline network to inject high-pressure nitrogen into the coal gasification unit, and avoids affecting users of the high-pressure stabilized nitrogen in the coal gasification unit. By adding a nitrogen pipeline to supply nitrogen to the COS hydrolyzer and avoiding the gasification high-pressure stabilized nitrogen pipeline network supplying nitrogen to the heater and COS hydrolyzer, it reduces high-pressure nitrogen consumption and offers certain economic benefits. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] The components include: 1. Nitrogen pipeline; 2. Syngas outlet valve at the gasification boundary; 3. Heater; 4. High-pressure nitrogen valve; 5. Check valve; 6. Pressure gauge; 7. Pressure safety valve; 8. Pressure regulating valve; 9. Nitrogen pipeline bypass; 10. Gasification high-pressure stable nitrogen pipeline network; 11. Gasification high-pressure discharge nitrogen pipeline network; 12. COS hydrolyzer; 13. Coal gasification unit; 14. High-pressure stable nitrogen inlet valve for coal gasification unit. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0022] The present invention will now be described in further detail with reference to the accompanying drawings:

[0023] See Figure 1This invention discloses a device for heating a COS hydrolyzer before the overall startup of an IGCC (Integrated Gasification Control Center). The device includes a high-pressure stable nitrogen gas pipeline network 10, which is sequentially connected to a syngas outlet gasification boundary manual valve 2, a heater 3, and a COS hydrolyzer 12. The syngas outlet gasification boundary manual valve 2 and the heater 3 are connected to a high-pressure nitrogen gas pipeline network 11 via a nitrogen pipeline 1. The syngas outlet gasification boundary manual valve 2 controls the connection and disconnection between the high-pressure stable nitrogen gas pipeline network 10 and the heater 3. The heater 3 heats the nitrogen entering the COS hydrolyzer 12. The high-pressure nitrogen gas pipeline network 11 supplies nitrogen to the heater 3 and the COS hydrolyzer 12. A high-pressure nitrogen manual valve 4 is installed on the nitrogen pipeline 1. The high-pressure nitrogen manual valve 4 is used to control the opening and closing of the nitrogen pipeline 1. When the gasification high-pressure discharge nitrogen pipeline 11 supplies nitrogen to the heater 3 and COS hydrolyzer 12 through the nitrogen pipeline 1, the syngas outlet gasification boundary manual valve 2 and the high-pressure stable nitrogen inlet coal gasification device valve 14 are closed to prevent the gasification high-pressure stable nitrogen pipeline 10 from supplying nitrogen to the heater 3 and COS hydrolyzer 12. This eliminates the process of high-pressure stable nitrogen entering the coal gasification device 13 and reduces the consumption of high-pressure nitrogen. At the same time, closing the syngas outlet gasification boundary manual valve 2 can also prevent nitrogen from the nitrogen pipeline 1 from entering the coal gasification device 13. This invention enables the COS hydrolyzer in the IGCC purification unit to be heated, eliminating the need for the gasification unit's stable nitrogen pipeline network 10 to inject high-pressure nitrogen into the coal gasification device 13. This also eliminates the impact on users of the high-pressure stable nitrogen in the coal gasification device. Furthermore, by adding a nitrogen pipeline 1 to supply nitrogen to the COS hydrolyzer 12, the consumption of high-pressure nitrogen can be reduced, resulting in certain economic benefits.

[0024] See Figure 1 In another feasible embodiment of the present invention, the following modifications are made as appropriate. It includes a gasification high-pressure stable nitrogen pipeline network 10, which is sequentially connected to a syngas outlet gasification boundary manual valve 2, a heater 3, and a COS hydrolyzer 12. The syngas outlet gasification boundary manual valve 2 and the heater 3 are connected to a gasification high-pressure discharge nitrogen pipeline network 11 via a nitrogen pipeline 1. A high-pressure nitrogen manual valve 4 is provided on the nitrogen pipeline 1. In specific operation, the outlet valve of the coal gasification unit 13, the syngas outlet gasification boundary manual valve 2, and the inlet valve, the high-pressure stable nitrogen inlet valve 14, are closed. The high-pressure nitrogen manual valve 4 is opened, and the gasification high-pressure discharge nitrogen pipeline 11 supplies nitrogen to the COS hydrolyzer 12 through the nitrogen pipeline 1. This prevents the gasification high-pressure stable nitrogen pipeline 10 from supplying nitrogen to the heater 3 and the COS hydrolyzer 12. At the same time, closing the syngas outlet gasification boundary manual valve 2 also prevents nitrogen from the nitrogen pipeline 1 from entering the coal gasification unit 13. This eliminates the process of high-pressure stable nitrogen entering the coal gasification unit 13, reduces nitrogen consumption, and has certain economic benefits.

[0025] Example 1:

[0026] See Figure 1 This embodiment discloses a device for heating the COS hydrolyzer before the overall startup of IGCC, including a gasification high-pressure stable nitrogen pipeline network 10. The gasification high-pressure stable nitrogen pipeline network 10 is sequentially connected to the high-pressure stable nitrogen inlet coal gasification device valve 14, coal gasification device 13, syngas outlet gasification boundary manual valve 2, heater 3 and COS hydrolyzer 12. The syngas outlet gasification boundary manual valve 2 and heater 3 are connected to the gasification high-pressure discharge nitrogen pipeline network 11 through a nitrogen pipeline 1. A high-pressure nitrogen manual valve 4 is provided on the nitrogen pipeline 1.

[0027] A check valve 5 is installed on nitrogen pipeline 1.

[0028] The check valve 5 is located between the high-pressure nitrogen manual valve 4 and the gasification high-pressure discharge nitrogen pipeline 11.

[0029] Check valve 5 is used to prevent nitrogen from flowing back into nitrogen pipeline 1.

[0030] Example 2:

[0031] See Figure 1 This embodiment discloses a device for heating the COS hydrolyzer before the overall startup of IGCC, including a gasification high-pressure stable nitrogen pipeline network 10. The gasification high-pressure stable nitrogen pipeline network 10 is sequentially connected to the high-pressure stable nitrogen inlet coal gasification device valve 14, coal gasification device 13, syngas outlet gasification boundary manual valve 2, heater 3 and COS hydrolyzer 12. The syngas outlet gasification boundary manual valve 2 and heater 3 are connected to the gasification high-pressure discharge nitrogen pipeline network 11 through a nitrogen pipeline 1. A high-pressure nitrogen manual valve 4 is provided on the nitrogen pipeline 1.

[0032] A pressure regulating valve 8 is installed on nitrogen pipeline 1.

[0033] The pressure regulating valve 8 is located between the check valve 5 and the gasification high-pressure discharge nitrogen pipeline 11.

[0034] Pressure regulating valve 8 is used to regulate the nitrogen pressure in nitrogen pipeline 1.

[0035] Example 3:

[0036] See Figure 1 This embodiment discloses a device for heating the COS hydrolyzer before the overall startup of IGCC, including a gasification high-pressure stable nitrogen pipeline network 10. The gasification high-pressure stable nitrogen pipeline network 10 is sequentially connected to the high-pressure stable nitrogen inlet coal gasification device valve 14, coal gasification device 13, syngas outlet gasification boundary manual valve 2, heater 3 and COS hydrolyzer 12. The syngas outlet gasification boundary manual valve 2 and heater 3 are connected to the gasification high-pressure discharge nitrogen pipeline network 11 through a nitrogen pipeline 1. A high-pressure nitrogen manual valve 4 is provided on the nitrogen pipeline 1.

[0037] The nitrogen pipeline 1 is equipped with a nitrogen pipeline bypass 9, which is connected to the atmosphere. The nitrogen pipeline bypass 9 is equipped with a pressure safety valve 7.

[0038] The nitrogen pipeline bypass 9 is located between the check valve 5 and the pressure regulating valve 8.

[0039] The pressure relief valve 7 on the nitrogen pipeline bypass 9 opens when the pressure in the nitrogen pipeline 1 is too high, in order to reduce the internal pressure of the nitrogen pipeline 1.

[0040] Example 4:

[0041] See Figure 1 This embodiment discloses a device for heating the COS hydrolyzer before the overall startup of IGCC, including a gasification high-pressure stable nitrogen pipeline network 10. The gasification high-pressure stable nitrogen pipeline network 10 is sequentially connected to the syngas outlet gasification boundary manual valve 2, the heater 3 and the COS hydrolyzer 12. The syngas outlet gasification boundary manual valve 2 and the heater 3 are connected to the gasification high-pressure discharge nitrogen pipeline network 11 through a nitrogen pipeline 1. A high-pressure nitrogen manual valve 4 is provided on the nitrogen pipeline 1.

[0042] A pressure gauge 6 is installed on the nitrogen pipeline 1. The pressure gauge 6 is located between the nitrogen pipeline bypass 9 and the pressure regulating valve 8.

[0043] Pressure gauge 6 is used to monitor the nitrogen pressure in nitrogen pipeline 1 in real time.

[0044] A coal gasification unit 13 is provided between the gasification high-pressure stable nitrogen pipeline network 10 and the syngas outlet gasification boundary manual valve 2, and a high-pressure stable nitrogen inlet valve 14 is provided between the gasification high-pressure stable nitrogen pipeline network 10 and the coal gasification unit 13. That is, the gasification high-pressure discharge nitrogen pipeline network 11 of the present invention supplies nitrogen to the heater 3 and COS hydrolyzer 12 through the nitrogen pipeline 1. At the same time, the syngas outlet gasification boundary manual valve 2 and the high-pressure stable nitrogen inlet valve 14 are closed, eliminating the process of high-pressure stable nitrogen entering the coal gasification unit 13, reducing the consumption of high-pressure nitrogen in the coal gasification unit 13, avoiding the supply of nitrogen to the heater 3 and COS hydrolyzer 12 through the gasification high-pressure stable nitrogen pipeline network 10, and also preventing nitrogen from the nitrogen pipeline 1 from entering the coal gasification unit 13 when the syngas outlet gasification boundary manual valve 2 is closed.

[0045] Given that the COS hydrolyzer 12 requires the gasification unit to stabilize the nitrogen pipeline 10 to inject high-pressure nitrogen into the coal gasification unit 13 for heating, and that there are many high-pressure nitrogen users in the coal gasification unit, and the coal gasification unit 13 is a high-pressure nitrogen user, which will cause excessive nitrogen consumption, in order to achieve energy saving and consumption reduction, a device for heating the COS hydrolyzer before the overall start-up of IGCC is proposed.

[0046] On the existing high-pressure nitrogen pipeline network 11 of the gasification unit, a high-pressure nitrogen pipeline 1 is led out and enters the pipeline after the existing synthesis gas outlet gasification boundary manual valve 2, and is equipped with valves, check valves, pressure gauges, pressure safety valves, pressure regulating valves and other accessories.

[0047] During the heating of COS hydrolyzer 12, it is no longer necessary to open the valve 14 for high-pressure stable nitrogen to enter the coal gasification unit and the manual valve 2 for syngas to exit the gasification zone. The gasification high-pressure stable nitrogen pipeline 10 is no longer used, but the gasification high-pressure discharge nitrogen pipeline 11 is used directly, which eliminates the process of high-pressure stable nitrogen entering the coal gasification unit 13 and reduces the consumption of high-pressure nitrogen.

[0048] This invention enables the COS hydrolyzer 12 of the IGCC purification unit to be heated without requiring the gasification unit's stable nitrogen pipeline network 10 to inject high-pressure nitrogen into the coal gasification device 13. This eliminates the impact on users of the high-pressure stable nitrogen in the coal gasification device. Furthermore, by adding a nitrogen pipeline 1 to supply nitrogen to the COS hydrolyzer 12, the consumption of high-pressure nitrogen can be reduced, resulting in certain economic benefits.

[0049] Based on the above structure, the present invention also discloses a method for operating a device for heating the COS hydrolyzer before the overall startup of an IGCC, comprising the following steps:

[0050] During the heating of COS hydrolyzer 12 by heater 3, the valve 14 of the high-pressure stable nitrogen gasification device and the manual valve 2 of the syngas gasification boundary are closed, and the high-pressure nitrogen manual valve 4 is opened. The gasification high-pressure discharge nitrogen pipeline 11 supplies nitrogen to COS hydrolyzer 12 through nitrogen pipeline 1.

[0051] In another feasible embodiment of the present invention, the following modifications are made as appropriate. During the heating of the COS hydrolyzer 12 by the heater 3, the syngas outlet gasification boundary manual valve 2 and the high-pressure stable nitrogen inlet valve 14 are closed to prevent the gasification high-pressure stable nitrogen pipeline 10 from supplying nitrogen to the heater 3 and the COS hydrolyzer 12. This eliminates the need for the gasification unit's stable nitrogen pipeline 10 to inject high-pressure nitrogen into the coal gasification unit 13, thus no longer affecting users of the high-pressure stable nitrogen in the coal gasification unit. The high-pressure nitrogen manual valve 4 is opened, and the gasification high-pressure discharge nitrogen pipeline 11 supplies nitrogen to the COS hydrolyzer 12 through the nitrogen pipeline 1. Simultaneously, since the syngas outlet gasification boundary manual valve 2 is closed, nitrogen from the nitrogen pipeline 1 is also prevented from entering the coal gasification unit 13, thereby reducing high-pressure nitrogen consumption and achieving certain economic benefits.

[0052] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A device for heating the COS hydrolyzer before the overall startup of an IGCC, characterized in that, The system includes a gasification high-pressure stable nitrogen pipeline network (10), on which a syngas outlet gasification boundary manual valve (2), a heater (3) and a COS hydrolyzer (12) are connected in sequence. The syngas outlet gasification boundary manual valve (2) and the heater (3) are connected to the gasification high-pressure discharge nitrogen pipeline network (11) through a nitrogen pipeline (1). A high-pressure nitrogen manual valve (4) is provided on the nitrogen pipeline (1). A coal gasification device (13) is provided between the gasification high-pressure stable nitrogen pipeline (10) and the syngas outlet gasification boundary manual valve (2), and a high-pressure stable nitrogen inlet coal gasification device valve (14) is provided between the gasification high-pressure stable nitrogen pipeline (10) and the coal gasification device (13). During the heating of COS hydrolyzer (12) by heater (3), the valve (14) of high pressure stable nitrogen gas into coal gasification device and the manual valve (2) of syngas outlet gasification zone on the gasification high pressure stable nitrogen gas pipeline (10) are closed, and the high pressure nitrogen manual valve (4) is opened. The gasification high pressure discharge nitrogen gas pipeline (11) supplies nitrogen to COS hydrolyzer (12) through nitrogen pipeline (1).

2. The device for heating the COS hydrolyzer before overall startup of IGCC as described in claim 1, characterized in that, The nitrogen pipeline (1) is equipped with a check valve (5).

3. The device for heating the COS hydrolyzer before overall startup of IGCC as described in claim 2, characterized in that, The check valve (5) is located between the high-pressure nitrogen manual valve (4) and the gasification high-pressure discharge nitrogen pipeline (11).

4. The device for heating the COS hydrolyzer before overall startup of IGCC as described in claim 2, characterized in that, The nitrogen pipeline (1) is equipped with a pressure regulating valve (8).

5. The device for heating the COS hydrolyzer before overall startup of IGCC as described in claim 4, characterized in that, The pressure regulating valve (8) is located between the check valve (5) and the gasification high-pressure discharge nitrogen pipeline (11).

6. The device for heating the COS hydrolyzer before overall startup of IGCC as described in claim 4, characterized in that, The nitrogen pipeline (1) is provided with a nitrogen pipeline bypass (9), which is connected to the atmosphere. A pressure safety valve (7) is provided on the nitrogen pipeline bypass (9).

7. The device for heating the COS hydrolyzer before overall startup of IGCC as described in claim 6, characterized in that, The nitrogen pipeline bypass (9) is located between the check valve (5) and the pressure regulating valve (8).

8. The device for heating the COS hydrolyzer before overall startup of IGCC as described in claim 6, characterized in that, A pressure gauge (6) is installed on the nitrogen pipeline (1), and the pressure gauge (6) is located between the nitrogen pipeline bypass (9) and the pressure regulating valve (8).

9. A method of operating the apparatus for heating the COS hydrolyzer before overall startup of an IGCC as described in any one of claims 1 to 8, characterized in that, Includes the following steps: During the heating of COS hydrolyzer (12) by heater (3), the valve (14) of high pressure stable nitrogen gas into coal gasification device and the manual valve (2) of syngas outlet gasification zone on the gasification high pressure stable nitrogen gas pipeline (10) are closed, and the high pressure nitrogen manual valve (4) is opened. The gasification high pressure discharge nitrogen gas pipeline (11) supplies nitrogen to COS hydrolyzer (12) through nitrogen pipeline (1).

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