CN211771101U - Pulverized coal gasification inert gas optimizing system - Google Patents

Abstract

The utility model discloses a pulverized coal gasification inert gas optimizing system, which comprises a carbon dioxide pipeline from a battery compartment, a high-pressure nitrogen pipeline from the battery compartment, a first buffer tank and a second buffer tank; the outlet of the carbon dioxide pipeline from the battery limits is divided into two paths, one path is communicated with the inlet of the first buffer tank, and the other path and the outlet of the high-pressure nitrogen pipeline from the battery limits are communicated with the inlet of the second buffer tank; the outlet of the first buffer tank is communicated with the conveying gas inlet of the pulverized coal pipeline, and the outlet of the second buffer tank is communicated with the inlet of the pulverized coal lock hopper pressurizing pipeline; and the outlet of the first buffer tank is also communicated with the outlet of the second buffer tank through a bypass line. The advantages are that: the utility model discloses can be all the time the preferred quantity of guaranteeing fine coal conveying required gas, avoid fine coal pipeline to take place the problem of jam, and then can guarantee fine coal gasification's safety and stability operation.

Description

Pulverized coal gasification inert gas optimizing system

The technical field is as follows:

the utility model relates to a fine coal gasification field especially relates to a fine coal gasification inert gas optimizing system.

Background art:

in the existing pulverized coal gasification process of a gasification device, inert gas is used as a medium for coal lock hopper pressurization and pulverized coal conveying, namely the inert gas firstly enters a buffer tank and then is divided into two paths, one path is used as pulverized coal conveying gas, and the other path is used as pulverized coal lock hopper pressurization gas.

Earlier, the inert gas was mostly nitrogen, which came from an air separation plant; in the later period, because nitrogen migrates to a synthesis gas purification system along with the synthesis gas, the synthesis gas purification efficiency is reduced, and the energy consumption is increased, carbon dioxide is adopted as inert gas, wherein the carbon dioxide comes from a low-temperature methanol washing device in a boundary area. Before the system is started, nitrogen is used as inert gas, and after the low-temperature methanol washing device produces carbon dioxide, the nitrogen is switched into carbon dioxide, namely, the carbon dioxide is used as the inert gas. However, in the normal operation process after the system is started, when the flow of the carbon dioxide from the low-temperature methanol washing device is reduced, the total amount of gas required by pulverized coal conveying and pulverized coal lock bucket pressurization cannot be met, one or more gasification devices must be selectively shut down, and in severe cases, all the gasification devices are required to be shut down, so that the continuous and stable operation of the system and the economic benefit of enterprises are seriously affected.

The utility model has the following contents:

an object of the utility model is to provide a fine coal gasification inert gas optimizing system can guarantee the required gaseous quantity of fine coal transportation by priority all the time, avoids fine coal pipeline to take place the problem of jam.

The utility model discloses by following technical scheme implement:

a pulverized coal gasification inert gas optimization system comprises a carbon dioxide pipeline from a battery limits, a high-pressure nitrogen pipeline from the battery limits, a first buffer tank and a second buffer tank;

the outlet of the carbon dioxide pipeline from the battery limits is divided into two paths, one path is communicated with the inlet of the first buffer tank, and the other path and the outlet of the high-pressure nitrogen pipeline from the battery limits are communicated with the inlet of the second buffer tank; the outlet of the first buffer tank is communicated with the conveying gas inlet of a pulverized coal pipeline, and the outlet of the second buffer tank is communicated with the inlet of a pulverized coal lock hopper pressurizing pipeline; and the outlet of the first buffer tank is also communicated with the outlet of the second buffer tank through a bypass pipeline;

the intercommunication comes from the carbon dioxide pipeline of boundary area with be equipped with first valve on the pipeline of first buffer tank the export of first buffer tank goes out to be equipped with the second valve, is in the intercommunication be equipped with the third valve on the pipeline of first buffer tank and fine coal pipeline be equipped with the fourth valve on the bypass pipeline, be in the intercommunication the second buffer tank with be equipped with the fifth valve on the pipeline of buggy lock fill pressure pipeline the exit of second buffer tank is equipped with the sixth valve, come from the carbon dioxide pipeline of boundary area in the intercommunication with be equipped with the seventh valve on the pipeline of second buffer tank, be equipped with the eighth valve in the exit of the high-pressure nitrogen pipeline that comes from the boundary area, be equipped with the ninth valve in the exit of the carbon dioxide pipeline that comes from the boundary area.

The utility model has the advantages that:

in the utility model, when the flow of carbon dioxide from the battery limits is stable and sufficient, the carbon dioxide is used as pulverized coal conveying gas and pulverized coal lock bucket pressurizing gas, and high-pressure nitrogen from the battery limits is not required to be introduced; when the flow of the carbon dioxide from the battery limits is reduced, a valve of a carbon dioxide inlet lock hopper pressurizing pipeline is immediately closed, so that the carbon dioxide is completely used for conveying the pulverized coal, and the lock hopper pressurizing gas is switched to high-pressure nitrogen, so that the gasification device can be ensured to continuously run without stopping; when the system is just started or the flow of carbon dioxide from a battery compartment is 0, high-pressure nitrogen from the battery compartment is used as pulverized coal conveying gas and pulverized coal lock hopper pressurizing gas.

The utility model discloses can be all the time the preferred quantity of guaranteeing fine coal and carrying required gas, avoid fine coal pipeline to take place the problem of jam, and then can guarantee fine coal gasification's safety and stability operation, avoided only adopting carbon dioxide to make as inert gas, because of coming from the not enough problem that causes gasification equipment to park of carbon dioxide flow in boundary region.

Description of the drawings:

in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of the system structure of the present embodiment.

In the figure: the device comprises a first buffer tank 1, a second buffer tank 2, a first valve 3, a second valve 4, a third valve 5, a fourth valve 6, a fifth valve 7, a sixth valve 8, a seventh valve 9, an eighth valve 10, a ninth valve 11 and a bypass pipeline 12.

The specific implementation mode is as follows:

the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1:

the pulverized coal gasification inert gas optimization system shown in fig. 1 comprises a carbon dioxide pipeline from a battery limits, a high-pressure nitrogen pipeline from the battery limits, a first buffer tank 1 and a second buffer tank 2, wherein in the embodiment, the second buffer tank 2 is at least two second buffer tanks 2 arranged in parallel;

the outlet of the carbon dioxide pipeline from the battery limits is divided into two paths, one path is communicated with the inlet of the first buffer tank 1, and the other path and the outlet of the high-pressure nitrogen pipeline from the battery limits are communicated with the inlet of the second buffer tank 2; the outlet of the first buffer tank 1 is communicated with the conveying gas inlet of a pulverized coal pipeline, and the outlet of the second buffer tank 2 is communicated with the inlet of a pulverized coal lock hopper pressurizing pipeline; and the outlet of the first buffer tank 1 is also communicated with the outlet of the second buffer tank 2 through a bypass pipeline 12;

a first valve 3 is arranged on a pipeline for communicating a carbon dioxide pipeline from a district with the first buffer tank 1, a second valve 4 is arranged at the outlet of the first buffer tank 1, a third valve 5 is arranged on a pipeline for communicating the first buffer tank 1 with a pulverized coal pipeline, a fourth valve 6 is arranged on a bypass pipeline 12, a fifth valve 7 is arranged on a pipeline for communicating the second buffer tank 2 with a pulverized coal lock charging pressure pipeline, a sixth valve 8 is arranged at the outlet of the second buffer tank 2, a seventh valve 9 is arranged on a pipeline for communicating a carbon dioxide pipeline from a district with the second buffer tank 2, an eighth valve 10 is arranged at the outlet of a high-pressure nitrogen pipeline from a district, and a ninth valve 11 is arranged at the outlet of a carbon dioxide pipeline from a district.

The working principle is as follows:

when the flow of the carbon dioxide from the battery limits is kept in a normal and stable state, the first valve 3, the second valve 4, the third valve 5, the fifth valve 7, the sixth valve 8, the seventh valve 9 and the ninth valve 11 are all opened, and simultaneously, the fourth valve 6 and the eighth valve 10 are all closed; at the moment, the carbon dioxide from the battery limits is used as the coal powder conveying gas and the coal powder lock hopper pressurizing gas, and high-pressure nitrogen from the battery limits does not need to be introduced.

When the flow rate of carbon dioxide from the battery limits is reduced, the first valve 3, the second valve 4, the third valve 5, the fourth valve 6, the fifth valve 7, the sixth valve 8, the eighth valve 10 and the ninth valve 11 are all opened, and the seventh valve 9 is closed; at the moment, carbon dioxide from the battery limits is only used as pulverized coal conveying gas, and high-pressure nitrogen from the battery limits is used as pulverized coal lock hopper pressurizing gas; meanwhile, when the flow of the carbon dioxide from the battery limits cannot meet the amount of gas required by pulverized coal conveying, high-pressure nitrogen from the battery limits can be used as a supplementary gas of the pulverized coal conveying gas.

When the system is just started or the flow of carbon dioxide from a battery compartment is 0, the third valve 5, the fourth valve 6, the fifth valve 7, the sixth valve 8 and the eighth valve 10 are all opened, and the first valve 3, the second valve 4, the seventh valve 9 and the ninth valve 11 are all closed; at the moment, the high-pressure nitrogen from the battery compartment is used as the pulverized coal conveying gas and the pulverized coal lock hopper pressurizing gas.

This embodiment is when the system just starts or the system breaks down, and the carbon dioxide that comes from the district is 0 or the flow is less promptly, can preferentially guarantee the required gaseous quantity of fine coal conveying, avoids the problem that the fine coal pipeline takes place to block up, can guarantee the safe and stable operation of fine coal gasification system.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (1)

1. The system for optimizing the inert gas for the pulverized coal gasification is characterized by comprising a carbon dioxide pipeline from a battery limits, a high-pressure nitrogen pipeline from the battery limits, a first buffer tank and a second buffer tank;

the outlet of the carbon dioxide pipeline from the battery limits is divided into two paths, one path is communicated with the inlet of the first buffer tank, and the other path and the outlet of the high-pressure nitrogen pipeline from the battery limits are communicated with the inlet of the second buffer tank; the outlet of the first buffer tank is communicated with the conveying gas inlet of a pulverized coal pipeline, and the outlet of the second buffer tank is communicated with the inlet of a pulverized coal lock hopper pressurizing pipeline; and the outlet of the first buffer tank is also communicated with the outlet of the second buffer tank through a bypass pipeline;

the intercommunication comes from the carbon dioxide pipeline of boundary area with be equipped with first valve on the pipeline of first buffer tank the export of first buffer tank goes out to be equipped with the second valve, is in the intercommunication be equipped with the third valve on the pipeline of first buffer tank and fine coal pipeline be equipped with the fourth valve on the bypass pipeline, be in the intercommunication the second buffer tank with be equipped with the fifth valve on the pipeline of buggy lock fill pressure pipeline the exit of second buffer tank is equipped with the sixth valve, come from the carbon dioxide pipeline of boundary area in the intercommunication with be equipped with the seventh valve on the pipeline of second buffer tank, be equipped with the eighth valve in the exit of the high-pressure nitrogen pipeline that comes from the boundary area, be equipped with the ninth valve in the exit of the carbon dioxide pipeline that comes from the boundary area.

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