阅读说明：本技术 用于气化炉烘炉的系统和气化炉烘炉的方法 (System for gasifier firing and method for gasifier firing ) 是由 张建峥 于 2019-03-13 设计创作，主要内容包括：本公开涉及一种用于气化炉烘炉的系统和气化炉烘炉的方法。该系统包括：气化炉、燃料气总管、燃料气支管、氧气支管和氧气总管,气化炉通过燃料气支管与燃料气总管连通,并且气化炉通过氧气支管与氧气总管连通；燃料气支管上设有第一调节阀,用于调节燃料气支管内的燃料气流量；燃料气总管上连接有第一排气管,第一排气管连接有第一放空阀,用于调节第一调节阀上游的压力；氧气支管上设有第二调节阀,用于调节氧气支管内的氧气流量；氧气总管上连接有第二排气管,第二排气管连接有第二放空阀,用于调节第二调节阀上游的压力。该系统和方法可以只用一套调节阀组完成整个气化炉烘炉过程,简化了烘炉流程和设备,同时还增加了氧气支管的安全性。(The present disclosure relates to a system for gasifier firing and a method of gasifier firing. The system comprises: the gasification furnace is communicated with the fuel gas main pipe through the fuel gas branch pipe, and is communicated with the oxygen main pipe through the oxygen branch pipe; the fuel gas branch pipe is provided with a first regulating valve for regulating the flow of fuel gas in the fuel gas branch pipe; the fuel gas main pipe is connected with a first exhaust pipe, and the first exhaust pipe is connected with a first emptying valve and used for adjusting the pressure at the upstream of the first regulating valve; the oxygen branch pipe is provided with a second regulating valve for regulating the oxygen flow in the oxygen branch pipe; and a second exhaust pipe is connected to the oxygen manifold, and the second exhaust pipe is connected with a second emptying valve and used for adjusting the pressure at the upstream of the second adjusting valve. The system and the method can finish the whole gasifier baking process by only using one set of regulating valve group, simplify the baking process and equipment, and simultaneously increase the safety of the oxygen branch pipe.)

1. A system for gasifier baking, the system comprising: the gasification furnace is communicated with the fuel gas main pipe through the fuel gas branch pipe, and the gasification furnace is communicated with the oxygen main pipe through the oxygen branch pipe;

the fuel gas branch pipe is provided with a first regulating valve for regulating the flow of fuel gas in the fuel gas branch pipe; the fuel gas main pipe is connected with a first exhaust pipe, and the first exhaust pipe is connected with a first emptying valve and used for adjusting the pressure at the upstream of the first adjusting valve;

the oxygen branch pipe is provided with a second regulating valve for regulating the oxygen flow in the oxygen branch pipe; and a second exhaust pipe is connected to the oxygen main pipe, and the second exhaust pipe is connected with a second emptying valve and used for adjusting the pressure at the upstream of the second adjusting valve.

2. The system of claim 1, wherein the first purge valve is disposed upstream of the fuel gas branch and the second purge valve is disposed upstream of the oxygen branch.

3. The system of claim 1, wherein the system further comprises:

the first pressure controller is arranged between the first emptying valve and the fuel gas branch pipe and is used for controlling the pressure of the fuel gas main pipe; and/or

And the second pressure controller is arranged between the second emptying valve and the oxygen branch pipe and is used for controlling the pressure of the oxygen main pipe.

4. The system of claim 1, wherein the gas outlet of the first vent valve is for communication with a flare; and/or the gas outlet of the second emptying valve is communicated with the atmosphere.

5. The system of claim 1, wherein the system includes only one set of regulating valves, the set of regulating valves consisting of the first regulating valve and the second regulating valve.

6. A method for carrying out gasifier baking by using the system of any one of claims 1 to 5, characterized in that the method comprises the following steps:

adjusting the flow of the fuel gas in the fuel gas branch pipe to a set value of the flow of the fuel gas; adjusting the oxygen flow in the oxygen branch pipe to the set oxygen flow value;

wherein the method of adjusting the flow rate of the fuel gas comprises: adjusting the pressure upstream of the first regulating valve by using the first emptying valve so that the pressure difference upstream and downstream of the first regulating valve meets the fuel gas flow set value e; and/or, adjusting the opening of the first regulating valve;

the method of regulating the oxygen flow rate comprises: adjusting the pressure upstream of the second regulating valve by using the second emptying valve so that the pressure difference upstream and downstream of the second regulating valve meets the set value i of the oxygen flow; and/or adjusting the opening of the second regulating valve.

7. The method of claim 6, wherein the method further comprises:

when the temperature of the gasification furnace rises, keeping the pressure difference between the upstream and downstream of the first regulating valve unchanged, and gradually increasing the valve opening of the first regulating valve; and/or keeping the pressure difference between the upstream and the downstream of the second regulating valve unchanged, and gradually increasing the valve opening of the second regulating valve.

8. The method of claim 7, wherein the method further comprises: when the opening degree of the first regulating valve reaches the maximum, regulating the pressure upstream of the first regulating valve by using the first emptying valve so that the pressure difference between the upstream and the downstream of the first regulating valve meets the fuel gas flow set value e; and/or the like and/or,

and when the opening degree of the second regulating valve reaches the maximum, regulating the pressure at the upstream of the second regulating valve by using the second emptying valve so as to enable the pressure difference at the upstream and the downstream of the second regulating valve to meet the set oxygen flow value.

9. The method of claim 6, wherein the method further comprises: and determining the set value of the fuel gas flow according to the furnace baking curve.

10. The method of claim 6, wherein the method further comprises: calculating the oxygen flow set value i according to the oxygen-fuel ratio g and the fuel gas flow set value e according to the following formula (1),

i is g.e formula (1).

Technical Field

The present disclosure relates to the field of coal gasification technology, and in particular, to a system for gasifier drying and a method for gasifier drying.

Background

The coal gasification unit needs to be baked on the lining before the first start-up. The fuel gas flow is controlled by adjusting valves and the oxygen flow is adjusted by oxygen-fuel ratio according to the furnace curve and the pressure rise curve provided by the lining manufacturer. So as to achieve the purpose of baking the furnace. The furnace profile of the lining is often in a range from 150 degrees to 1400 degrees, with the pressure going from low pressure to normal operating pressure if the gasifier is charged at pressure. The whole process needs about 10 days, so that in a wide range, two sets of regulating valve banks are basically needed to realize the regulation of the whole process, and if only one set of regulating valve bank is used, the stable control from low flow to high flow cannot be basically met.

Disclosure of Invention

The invention aims to provide a system for drying a gasification furnace and a method for drying the gasification furnace, which can realize the whole regulation process of the gasification furnace from low pressure to high pressure and the flow from small to large by using only one group of regulating valves.

To achieve the above object, a first aspect of the present disclosure provides a system for a gasifier oven, the system comprising: the gasification furnace is communicated with the fuel gas main pipe through the fuel gas branch pipe, and the gasification furnace is communicated with the oxygen main pipe through the oxygen branch pipe;

the fuel gas branch pipe is provided with a first regulating valve for regulating the flow of fuel gas in the fuel gas branch pipe; the fuel gas main pipe is connected with a first exhaust pipe, and the first exhaust pipe is connected with a first emptying valve and used for adjusting the pressure at the upstream of the first adjusting valve;

the oxygen branch pipe is provided with a second regulating valve for regulating the oxygen flow in the oxygen branch pipe; and a second exhaust pipe is connected to the oxygen main pipe, and the second exhaust pipe is connected with a second emptying valve and used for adjusting the pressure at the upstream of the second adjusting valve.

Optionally, the first purge valve is disposed upstream of the fuel gas branch and the second purge valve is disposed upstream of the oxygen branch.

Optionally, the system further comprises:

the first pressure controller is arranged between the first emptying valve and the fuel gas branch pipe and is used for controlling the pressure of the fuel gas main pipe; and/or

And the second pressure controller is arranged between the second emptying valve and the oxygen branch pipe and is used for controlling the pressure of the oxygen main pipe.

Optionally, the gas outlet of the first vent valve is for communication with a flare; and/or the gas outlet of the second emptying valve is communicated with the atmosphere.

Optionally, the system includes only one set of regulating valves, the set of regulating valves consisting of the first regulating valve and the second regulating valve.

A second aspect of the present disclosure provides a method of gasifier firing using the system of the first aspect of the present disclosure, the method comprising the steps of:

adjusting the flow of the fuel gas in the fuel gas branch pipe to a set value of the flow of the fuel gas; adjusting the oxygen flow in the oxygen branch pipe to the set oxygen flow value;

wherein the method of adjusting the flow rate of the fuel gas comprises: adjusting the pressure upstream of the first regulating valve by using the first emptying valve so that the pressure difference upstream and downstream of the first regulating valve meets the fuel gas flow set value e; and/or, adjusting the opening of the first regulating valve;

the method of regulating the oxygen flow rate comprises: adjusting the pressure upstream of the second regulating valve by using the second emptying valve so that the pressure difference upstream and downstream of the second regulating valve meets the set oxygen flow value; and/or adjusting the opening of the second regulating valve.

Optionally, the method further comprises:

when the temperature of the gasification furnace rises, keeping the pressure difference between the upstream and downstream of the first regulating valve unchanged, and gradually increasing the valve opening of the first regulating valve; and/or keeping the pressure difference between the upstream and the downstream of the second regulating valve unchanged, and gradually increasing the valve opening of the second regulating valve.

Optionally, the method further comprises: when the opening degree of the first regulating valve reaches the maximum, regulating the pressure upstream of the first regulating valve by using the first emptying valve so that the pressure difference between the upstream and the downstream of the first regulating valve meets the fuel gas flow set value e; and/or the like and/or,

and when the opening degree of the second regulating valve reaches the maximum, regulating the pressure at the upstream of the second regulating valve by using the second emptying valve so as to enable the pressure difference at the upstream and the downstream of the second regulating valve to meet the set oxygen flow value.

Optionally, the method further comprises: and determining the set value of the fuel gas flow according to the furnace baking curve.

Optionally, the method further comprises: calculating the oxygen flow set value i according to the oxygen-fuel ratio g and the fuel gas flow set value e according to the following formula (1),

i is g.e formula (1).

The system and the method disclosed by the invention utilize the fuel gas main blow-down valve to control the pressure of the upstream of the fuel gas, adjust the pressure difference of the regulating valve and stabilize the flow of the fuel gas under different pressures of the gasification furnace; meanwhile, the upstream pressure of the oxygen branch pipe is controlled by using the oxygen branch pipe emptying valve, and the oxygen flow is controlled by the oxygen-fuel ratio, so that the oxygen flow is stable; through the technical scheme, the pressure difference of the regulating valve can be reduced by utilizing the adjustment of the emptying valve of the high-pressure fuel gas and high-pressure oxygen upstream main pipe, and the control of the fuel gas and the oxygen flow in the process of baking the lining of the gasification furnace is ensured, so that the baking of the gasification furnace is realized. The system and the method can realize the furnace drying process of the whole gasification furnace by only one set of regulating valve group, greatly simplify the furnace drying process, save the equipment investment and simultaneously increase the safety of an oxygen pipeline compared with the traditional gasification furnace which needs two sets of regulating valve groups.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a process flow diagram of one embodiment of a method of gasifier firing of the present disclosure.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise stated, the use of directional words such as "up" and "down" generally refers to the up and down of the device in normal use, and specifically refers to the orientation of the drawing in fig. 1. The "inner and outer" are with respect to the outline of the device itself.

The present disclosure provides in a first aspect a system for a gasifier oven, the system comprising: the gasification furnace is communicated with the fuel gas main pipe through the fuel gas branch pipe, and is communicated with the oxygen main pipe through the oxygen branch pipe;

the fuel gas branch pipe is provided with a first regulating valve for regulating the flow of fuel gas in the fuel gas branch pipe; the fuel gas main pipe is connected with a first exhaust pipe, and the first exhaust pipe is connected with a first emptying valve and used for adjusting the pressure at the upstream of the first regulating valve;

the oxygen branch pipe is provided with a second regulating valve for regulating the oxygen flow in the oxygen branch pipe; and a second exhaust pipe is connected to the oxygen manifold, and the second exhaust pipe is connected with a second emptying valve and used for adjusting the pressure at the upstream of the second adjusting valve.

The system and the method disclosed by the invention utilize the fuel gas main blow-down valve to control the pressure of the upstream of the fuel gas, adjust the pressure difference of the regulating valve and stabilize the flow of the fuel gas under different pressures of the gasification furnace; meanwhile, the upstream pressure of the oxygen branch pipe is controlled by using the oxygen branch pipe emptying valve, and the oxygen flow is controlled by the oxygen-fuel ratio, so that the oxygen flow is stable; through the technical scheme, the pressure difference of the regulating valve can be reduced by utilizing the adjustment of the emptying valve of the high-pressure fuel gas and high-pressure oxygen upstream main pipe, and the control of the fuel gas and the oxygen flow in the process of baking the lining of the gasification furnace is ensured, so that the baking of the gasification furnace is realized. The system and the method can realize the furnace baking process of the whole gasification furnace by only using one set of regulating valve group, namely, the system only comprises the first regulating valve arranged on the fuel gas branch pipe and the second regulating valve arranged on the oxygen branch pipe without other regulating valves.

Wherein "upstream" and "downstream" of the conduit means upstream and downstream in the direction of gas flow.

To facilitate control of the pressure before (i.e., upstream) the first regulator valve using the first vent valve and before (i.e., upstream) the second regulator valve using the second vent valve, in one embodiment, as shown in FIG. 1, the first vent valve is disposed upstream of the fuel gas branch pipe, i.e., the first exhaust pipe may be disposed upstream of the fuel gas branch pipe; the second purge valve may be disposed upstream of the oxygen manifold, i.e., the second exhaust pipe may be disposed upstream of the oxygen manifold.

To facilitate control of the fuel gas pressure upstream of the first regulator valve, in one embodiment, as shown in FIG. 1, the system may further include a first pressure controller that may be disposed between the first vent valve and the fuel gas branch pipe for controlling the pressure of the fuel gas main; in particular, the first pressure controller may be conventional in the art, such as a control device that may control the line pressure at a set point.

To facilitate control of the oxygen pressure upstream of the second regulator valve, in one embodiment, as shown in FIG. 1, the system may further include a second pressure controller that may be disposed between the second vent valve and the oxygen manifold for controlling the pressure of the oxygen manifold; in particular, the second pressure controller may be conventional in the art, such as a control device that may control the line pressure at a set point.

In a system according to the present disclosure, the pressure of the fuel gas branch between the first vent valve and the first regulator valve may be regulated by venting the fuel gas header through the first vent valve, and in one embodiment, the gas outlet of the first vent valve may be used in communication with a flare to enable flare-free combustion of the vented fuel gas.

In the system of the present disclosure, the pressure of the oxygen branch between the second vent valve and the second regulating valve can be regulated by venting the gas of the oxygen manifold through the second vent valve, and in one embodiment, the gas outlet of the second vent valve can be used for communicating with the atmosphere to discharge oxygen.

A second aspect of the present disclosure provides a method of gasifier firing using the system of the first aspect of the present disclosure.

Further, in order to ensure the smooth flow of fuel gas and oxygen during the baking process, the method may comprise the following steps: regulating the flow of the fuel gas in the fuel gas branch pipe to a set value of the flow of the fuel gas; adjusting the oxygen flow in the oxygen branch pipe to an oxygen flow set value; the furnace is baked by the combustion of the fuel gas, and the temperature of the gasification furnace is made to accord with the temperature required in the furnace baking curve. The method for adjusting the flow rate of the fuel gas may include: utilizing a first air release valve to adjust the pressure at the upstream of the first adjusting valve so as to enable the pressure difference at the upstream and the downstream of the first adjusting valve to meet a set value e of the fuel gas flow; and/or the opening of the first regulating valve is regulated, i.e. the flow of the fuel gas can be regulated by regulating the pressure upstream of the first regulating valve only by the first relief valve, or the flow of the fuel gas can be regulated by regulating the opening of the first regulating valve only, or preferably, the flow of the fuel gas is regulated by regulating the pressure upstream of the first regulating valve and regulating the opening of the first regulating valve by the first relief valve. Wherein, the opening degree of the first regulating valve and the second regulating valve can be respectively and independently between 20-80%, preferably between 30-70%.

The method for adjusting the oxygen flow rate can comprise the following steps: adjusting the pressure at the upstream of the second regulating valve by using a second emptying valve so that the pressure difference at the upstream and the downstream of the second regulating valve meets the set value of the oxygen flow; and/or adjusting the opening of the second regulating valve.

Further, the method may further include:

when the temperature of the gasification furnace rises, the pressure difference between the upstream and downstream of the first regulating valve is kept unchanged, and the valve opening of the first regulating valve is gradually increased; and/or keeping the pressure difference between the upstream and the downstream of the second regulating valve unchanged, and gradually increasing the valve opening of the second regulating valve.

Further, the method may further include: when the first regulating valve cannot effectively regulate the upstream and downstream pressure difference, for example, the opening of the first regulating valve reaches more than 80%, or more than 90%, or the opening of the first regulating valve reaches the maximum, the pressure at the upstream of the first regulating valve can be regulated by using the first emptying valve, so that the upstream and downstream pressure difference of the first regulating valve meets the fuel gas flow set value e; and/or the like and/or,

when the second regulating valve cannot effectively regulate the upstream and downstream pressure difference, for example, the opening degree of the second regulating valve reaches more than 80%, or more than 90%, or when the opening degree of the second regulating valve reaches the maximum, the pressure upstream of the second regulating valve can be regulated by using the second emptying valve, so that the upstream and downstream pressure difference of the second regulating valve meets the oxygen flow set value i.

For example, in one embodiment, the pressure upstream of the first regulating valve can be regulated to a set value by the first emptying valve, so that the pressure difference between the upstream and the downstream of the first regulating valve meets the requirement of the oven curve, and when the temperature of the gasification oven rises, the opening degree of the first regulating valve can be increased; when the valve opening reaches the maximum value, when the temperature of the gasification furnace rises, the set value can be increased, and the first emptying valve is adjusted again to adjust the pressure at the upstream of the first regulating valve to a new set value so as to keep the proper pressure difference between the upstream and the downstream of the first regulating valve.

For example, in one embodiment, the pressure upstream of the second regulating valve can be regulated to a set value by using the second emptying valve, so that the pressure difference between the upstream and the downstream of the second regulating valve meets the requirement of the oven curve, and the opening degree of the second regulating valve can be increased when the temperature of the gasification furnace is increased; when the valve opening reaches the maximum value and the temperature of the gasification furnace rises, the set value can be increased, and the second emptying valve is adjusted again to adjust the pressure at the upstream of the second regulating valve to a new set value so as to maintain the proper pressure difference between the upstream and the downstream of the second regulating valve.

In the method according to the present disclosure, the furnace profile is well known to those skilled in the art and generally includes a furnace temperature setpoint profile, a gasifier pressure setpoint profile, a fuel gas flow setpoint profile, and an oxygen flow setpoint profile. Further, the fuel gas flow set value can be determined according to a furnace baking curve; for example, the fuel gas flow set point may be determined from a fuel gas flow set point curve in a furnace curve; alternatively, the fuel gas flow set point may be calculated and determined according to a temperature set point curve in the furnace curve, and the calculation method may be conventional in the art and will not be described herein.

In the method according to the present disclosure, further, the oxygen flow rate set value i may be calculated according to the following formula (1) according to the oxygen-fuel ratio g and the fuel gas flow rate set value e, so as to control the oxygen flow rate and maintain the oxygen flow rate steady;

i is g.e formula (1).

The oxygen-fuel ratio g is well known to those skilled in the art, and can be selected according to the type of fuel gas and the temperature rise of the gasifier, and will not be described herein.

The present disclosure is further illustrated by the following examples, but is not to be construed as being limited thereby.