阅读说明：本技术 一种气化炉激冷气量控制系统及其工作方法 (Chilling gas amount control system of gasification furnace and working method thereof ) 是由 罗丽珍 王鹏杰 许世森 陶继业 任永强 李小宇 刘沅 陈智 樊强 袁广武 刘飘 于 2021-01-09 设计创作，主要内容包括：本发明公开的一种气化炉激冷气量控制系统及其工作方法,属于气化炉技术领域。除灰单元与气化炉的废锅出口连接,合成气流量检测装置设在除灰单元与废锅出口的连接管路上,除灰单元与水洗单元连接,水洗单元与激冷气循环压缩机连接,激冷气循环压缩机连接至气化炉的激冷气入口；废锅入口温度检测装置设在废锅入口处,激冷气流量检测装置设在水洗单元与激冷气循环压缩机之间的连接管路上,激冷气调节单元分别与激冷气流量检测装置和激冷气循环压缩机连接；废锅入口温度检测装置、激冷气调节单元和合成气流量检测装置分别连接至控制单元。该系统能够根据气化炉负荷对激冷气量做出实时匹配和调整,减少能耗,保证气化炉的高效稳定运行。(The invention discloses a chilling gas amount control system of a gasification furnace and a working method thereof, and belongs to the technical field of gasification furnaces. The synthetic gas flow detection device is arranged on a connecting pipeline between the ash removal unit and the waste pot outlet, the ash removal unit is connected with the water washing unit, the water washing unit is connected with the chilling gas circulating compressor, and the chilling gas circulating compressor is connected to the chilling gas inlet of the gasification furnace; the waste pot inlet temperature detection device is arranged at the waste pot inlet, the chilling gas flow detection device is arranged on a connecting pipeline between the water washing unit and the chilling gas circulating compressor, and the chilling gas adjusting unit is respectively connected with the chilling gas flow detection device and the chilling gas circulating compressor; the waste boiler inlet temperature detection device, the chilling gas adjusting unit and the synthetic gas flow detection device are respectively connected to the control unit. The system can match and adjust the chilling gas quantity in real time according to the load of the gasification furnace, reduce energy consumption and ensure efficient and stable operation of the gasification furnace.)

1. A chilling gas quantity control system of a gasification furnace is characterized by comprising a control unit (1), an ash removal unit (2), a water washing unit (3), a waste pot inlet temperature detection device (4), a chilling gas flow detection device (5), a chilling gas circulating compressor (6), a chilling gas regulation unit (7) and a synthesis gas flow detection device (8);

the ash removal unit (2) is connected with a waste pot outlet of the gasification furnace, the synthetic gas flow detection device (8) is arranged on a connecting pipeline between the ash removal unit (2) and the waste pot outlet, the ash removal unit (2) is connected with the water washing unit (3), the water washing unit (3) is connected with the chilling gas circulating compressor (6), and the chilling gas circulating compressor (6) is connected to a chilling gas inlet of the gasification furnace; the waste pot inlet temperature detection device (4) is arranged at the waste pot inlet, the chilling gas flow detection device (5) is arranged on a connecting pipeline between the water washing unit (3) and the chilling gas circulating compressor (6), and the chilling gas adjusting unit (7) is respectively connected with the chilling gas flow detection device (5) and the chilling gas circulating compressor (6); the waste boiler inlet temperature detection device (4), the chilling gas adjusting unit (7) and the synthesis gas flow detection device (8) are respectively connected to the control unit (1).

2. The system for controlling the chilling gas amount of the gasification furnace according to claim 1, wherein the outlet of the water washing unit (3) is connected with two branches, one branch is connected with the chilling gas circulating compressor (6), and the other branch is connected with a gas purification system.

3. The system for controlling the chilling gas amount of the gasification furnace according to claim 2, wherein a control valve is arranged on a branch of the outlet of the water washing unit (3) connected with the gas purification system.

4. The system for controlling the amount of chilling gas of a gasification furnace according to claim 1, wherein a defoaming device is arranged at an inlet of the chilling gas circulating compressor (6).

5. The system for controlling the amount of chilling gas of a gasification furnace according to claim 1, wherein the chilling gas recycle compressor (6) is a variable frequency compressor.

6. A gasifier quench gas amount control system according to claim 1, characterized in that the quench gas adjusting unit (7) comprises frequency regulators, which are connected to the control unit (1) and the quench gas recycle compressor (6), respectively.

7. The working method of the gasifier quench gas amount control system according to any one of claims 1 to 6, comprising:

fly ash from the waste boiler outlet enters an excited gas circulating compressor (6) after being treated by an ash removal unit (2) and a water washing unit (3) in sequence; the waste boiler inlet temperature detection device (4) detects the temperature of the synthesis gas at the waste boiler inlet, the synthesis gas flow detection device (8) detects the initial synthesis gas amount, and the chilling gas flow detection device (5) detects the real-time chilling gas amount; the control unit (1) regulates and controls the chilling gas quantity entering the gasification furnace in real time through the chilling gas regulating unit (7) according to the temperature of the synthesis gas.

8. The method of claim 7, wherein the real-time control of the amount of quench gas introduced into the gasifier is performed by the following equation:

Z×λ×[M₀T-M₁(T-_△T)-(M₀-M₁)T]＝_△MTλ

wherein M is₀For the initial amount of synthesis gas, M₁In order to chill the gas quantity in real time,_△m is the flow variation of the circulating chilling gas, lambda is the specific heat of the synthetic gas, T is the temperature of the synthetic gas at the inlet of the initial waste boiler,_△t is the temperature variation of the synthetic gas at the inlet of the waste boiler, and Z is the correction coefficient of the heat loss.

9. The working method of the gasifier chilling gas amount control system according to claim 8, wherein a value range of Z is 0.8-1.2.

10. The working method of the gasifier quench gas amount control system according to claim 7, wherein at the start of gasification, quench gas amount is fed according to simulated working conditions and empirical values, and the control unit (1) regulates and controls the quench gas amount entering the gasifier in real time according to the variation of the syngas temperature.

Technical Field

The invention belongs to the technical field of gasification furnaces, and particularly relates to a system for controlling chilling gas quantity of a gasification furnace and a working method thereof.

Background

The coal gasification technology is a core technology for clean and efficient utilization of coal, is a key technology for developing advanced clean coal power generation, coal chemical industry, coal-based poly-generation and other energy systems, and has important influence on the operation reliability and economy of each system. Driven by the rapid development of modern coal chemical engineering projects, coal gasification technology is developing towards large-scale, clean, efficient and wide coal adaptability. The development of coal gasification technology presents a lot of flowers, but in the development process of the high-efficiency clean coal gasification technology at the present stage, a plurality of problems still exist and need to be solved.

In the existing gasification furnace combustion process, in order to ensure that the temperature of the waste boiler inlet is proper, the chilling gas quantity is generally opened to the maximum, so that a large amount of chilling gas is wasted, and the energy consumption of the device is increased.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a system for controlling a chilling gas amount of a gasification furnace and a method for operating the same, which can match and adjust the chilling gas amount in real time according to a load of the gasification furnace, reduce energy consumption, and ensure efficient and stable operation of the gasification furnace.

The invention is realized by the following technical scheme:

the invention discloses a chilling gas quantity control system of a gasification furnace, which comprises a control unit, an ash removal unit, a washing unit, a waste pot inlet temperature detection device, a chilling gas flow detection device, a chilling gas circulating compressor, a chilling gas regulation unit and a synthesis gas flow detection device, wherein the chilling gas flow detection device is connected with the waste pot inlet temperature detection device;

the synthetic gas flow detection device is arranged on a connecting pipeline between the ash removal unit and the waste pot outlet, the ash removal unit is connected with the water washing unit, the water washing unit is connected with the chilling gas circulating compressor, and the chilling gas circulating compressor is connected to the chilling gas inlet of the gasification furnace; the waste pot inlet temperature detection device is arranged at the waste pot inlet, the chilling gas flow detection device is arranged on a connecting pipeline between the water washing unit and the chilling gas circulating compressor, and the chilling gas adjusting unit is respectively connected with the chilling gas flow detection device and the chilling gas circulating compressor; the waste boiler inlet temperature detection device, the chilling gas adjusting unit and the synthetic gas flow detection device are respectively connected to the control unit.

Preferably, the outlet of the water washing unit is connected with two branches, one branch is connected with the chilling gas circulating compressor, and the other branch is connected with the gas purification system.

Further preferably, a control valve is arranged on a branch of the outlet of the water washing unit, which is connected with the gas purification system.

Preferably, the inlet of the chilling gas circulation compressor is provided with a defoaming device.

Preferably, the quench gas recycle compressor is a variable frequency compressor.

Preferably, the quench gas conditioning unit comprises a frequency regulator, which is connected with the control unit and the quench gas recycle compressor, respectively.

The invention discloses a working method of the gasifier chilling gas quantity control system, which comprises the following steps:

the fly ash from the waste boiler outlet enters an excited gas circulating compressor after being sequentially treated by an ash removal unit and a water washing unit; the method comprises the following steps that a waste pot inlet temperature detection device detects the temperature of synthesis gas at a waste pot inlet, a synthesis gas flow detection device detects initial synthesis gas amount, and a chilling gas flow detection device detects real-time chilling gas amount; the control unit regulates and controls the chilling gas quantity entering the gasification furnace in real time through the chilling gas regulating unit according to the temperature of the synthesis gas.

Preferably, the real-time regulation of the amount of the chilling gas entering the gasification furnace is performed by the following formula:

Z×λ×[M₀T-M₁(T-_△T)-(M₀-M₁)T]＝_△MTλ

wherein M is₀For the initial amount of synthesis gas, M₁In order to chill the gas quantity in real time,_△m is the flow variation of the circulating chilling gas, lambda is the specific heat of the synthetic gas, T is the temperature of the synthetic gas at the inlet of the initial waste boiler,_△t is the temperature variation of the synthetic gas at the inlet of the waste boiler, and Z is the correction coefficient of the heat loss.

Further preferably, the value range of Z is 0.8-1.2.

Preferably, at the beginning of gasification, the chilling gas quantity is fed according to a simulation working condition and an empirical value, and the control unit regulates and controls the chilling gas quantity entering the gasification furnace in real time according to the temperature variation of the synthesis gas.

Compared with the prior art, the invention has the following beneficial technical effects:

according to the chilling gas amount control system of the gasification furnace, the chilling gas amount is controlled through the temperature of the synthesis gas at the inlet of the waste pot, so that the circulating chilling gas amount is accurately controlled, unnecessary waste of the chilling gas is avoided, stable operation in the gasification frequency modulation process is guaranteed, and the energy consumption of the system is reduced. When the system adjusts the load of the gasification furnace, the chilling gas amount can be adjusted in real time according to the temperature of the waste boiler inlet, the time required by the load adjustment of the gasification furnace is shortened, and the activity and the stability of the load adjustment of the gasification furnace are improved. Greatly reduces energy consumption, saves energy, protects environment and has good application prospect.

Furthermore, the outlet of the water washing unit is simultaneously connected with two branches, so that redundant synthesis gas can be led out of the system through the crude synthesis gas discharge pipe for utilization.

Furthermore, a control valve is arranged on a branch of the outlet of the water washing unit, which is connected with the gas purification system, when all the synthesis gas is to enter the chilling gas circulating compressor for use, the branch is closed through the control valve, so that the efficiency of the chilling gas circulating compressor can be improved, and the energy consumption is reduced.

Furthermore, a defoaming device is arranged at the inlet of the chilling gas circulating compressor to remove the moisture fly ash in the synthetic gas treated by the water cooling unit, so that the loss of equipment is reduced.

Furthermore, the chilling gas circulating compressor is a variable frequency compressor, so that the chilling gas amount can be changed and adjusted in real time according to the working condition of the gasification furnace.

The working method of the gasifier chilling gas amount control system disclosed by the invention has high automation degree, can match and adjust the chilling gas amount in real time according to the gasifier load, reduces the chilling gas amount, reduces the energy consumption, and ensures the efficient and stable operation of the gasifier.

Furthermore, the chilling gas amount can be accurately controlled through a formula, so that the energy consumption is further reduced, and the efficiency of the gasification furnace is improved.

Furthermore, according to the real-time working conditions of the raw materials and the gasification furnace, the heat loss is corrected by adopting Z, so that the accuracy of controlling the amount of the chilling gas can be further improved.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

In the figure: 1-control unit, 2-ash removal unit, 3-water washing unit, 4-waste pot inlet temperature detection device, 5-chilling gas flow detection device, 6-chilling gas circulating compressor, 7-chilling gas regulation unit and 8-synthesis gas flow detection device.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings, which are included to illustrate and not to limit the invention:

referring to fig. 1, the system for controlling the amount of chilling gas of a gasification furnace according to the present invention includes a control unit 1, an ash removal unit 2, a water washing unit 3, a waste pan inlet temperature detection device 4, a chilling gas flow detection device 5, a chilling gas circulation compressor 6, a chilling gas adjustment unit 7, and a synthesis gas flow detection device 8.

The ash removal unit 2 is connected with a waste boiler outlet of the gasification furnace, the synthetic gas flow detection device 8 is arranged on a connecting pipeline of the ash removal unit 2 and the waste boiler outlet, the ash removal unit 2 is connected with the water washing unit 3, an outlet of the water washing unit 5 is connected with two branches, one branch is connected with the chilling gas circulating compressor 6, the other branch is connected with the gas purification system, and preferably, a control valve is arranged on a branch pipeline of the outlet of the water washing unit 5 connected with the gas purification system. When the chilling gas circulating compressor 6 only utilizes a part of the synthesis gas, the redundant synthesis gas can be led out of the system for utilization through the crude synthesis gas discharge pipe; when the synthesis gas is completely fed into the chilling gas circulating compressor for use, the branch is closed through the control valve, so that the efficiency of the chilling gas circulating compressor can be improved, and the energy consumption is reduced.

Preferably, a defoaming device is arranged at the inlet of the chilling gas circulating compressor 6, so that the moisture fly ash in the synthesis gas treated by the water cooling unit can be removed, and the loss of equipment is reduced. The chilling gas circulating compressor 6 adopts a variable frequency compressor, so that the chilling gas amount can be changed and adjusted in real time according to the working condition of the gasification furnace. The quench gas conditioning unit 7 comprises frequency regulators which are connected to the control unit 1 and the quench gas circulation compressor 6, respectively.

The chilling gas circulating compressor 6 is connected to a chilling gas inlet of the gasification furnace; the waste pot inlet temperature detection device 4 is arranged at the waste pot inlet, the chilling gas flow detection device 5 is arranged on a connecting pipeline between the water washing unit 3 and the chilling gas circulating compressor 6, and the chilling gas adjusting unit 7 is respectively connected with the chilling gas flow detection device 5 and the chilling gas circulating compressor 6; the waste-pot inlet temperature detection device 4, the quench air conditioning unit 7 and the syngas flow detection device 8 are connected to the control unit 1, respectively.

The waste boiler inlet temperature detection device 4 is preferably a thermocouple and is vertically arranged at the center of the waste boiler inlet.

The ash removal unit 2 preferably adopts a bag-type dust remover.

The water washing unit 3 preferably employs a gas washing tower.

The working method of the gasifier chilling gas quantity control system comprises the following steps:

fly ash from the outlet of the waste boiler enters a cold air circulating compressor 6 after being treated by an ash removal unit 2 and a water washing unit 3 in sequence; the waste boiler inlet temperature detection device 4 detects the temperature of the synthesis gas at the waste boiler inlet, the synthesis gas flow detection device 8 detects the initial synthesis gas amount, and the chilling gas flow detection device 5 detects the real-time chilling gas amount; the control unit 1 regulates and controls the chilling gas quantity entering the gasification furnace in real time through the chilling gas regulating unit 7 according to the temperature of the synthesis gas.

The real-time regulation and control of the amount of chilling gas entering the gasification furnace are carried out by the following formula:

Z×λ×[M₀T-M₁(T-_△T)-(M₀-M₁)T]＝_△MTλ

wherein M is₀For the initial amount of synthesis gas, M₁In order to chill the gas quantity in real time,_△m is the flow variation of the circulating chilling gas, lambda is the specific heat of the synthetic gas, T is the temperature of the synthetic gas at the inlet of the initial waste boiler,_△t is the temperature variation of the synthetic air at the inlet of the waste boiler, Z represents the correction coefficient of heat loss, and generally, the value range of Z is 0.8-1.2.

At the beginning of gasification, the chilling gas quantity is fed according to a simulation working condition and an empirical value, and the control unit 1 regulates and controls the chilling gas quantity entering the gasification furnace in real time according to the temperature variation of the synthesis gas.

The effects of the present invention will be described in further detail with reference to a specific embodiment:

the detailed parameters of a certain segment gasification furnace are as follows:

9907kg/h dry pulverized coal pressurized gasification furnace, synthetic gas flow 18000Nm³The temperature of the waste boiler inlet was set at 1100 deg.C, and the flow rate of the synthesis gas was changed to 17000Nm by changing the type of coal³The temperature of the waste boiler inlet is reduced by 50 ℃, and the calculation of the system is carried out,

Z×λ×[M₀T-M₁(T-_△T)-(M₀-M₁)T]＝_△MTλ

_△M＝772.7Nm³/h

reduced circulating chilled gas flow 772.7Nm³/h。

The above description is only a part of the embodiments of the present invention, and although some terms are used in the present invention, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention and are to be construed as any additional limitation which is not in accordance with the spirit of the invention. The foregoing is merely an illustration of the present invention for the purpose of providing an easy understanding and is not intended to limit the present invention to the particular embodiments disclosed herein, and any technical extensions or innovations made herein are protected by the present invention.