阅读说明：本技术 一种管道式荒煤气预冷系统及其预冷方法 (Pipeline type raw gas precooling system and precooling method thereof ) 是由 徐斌 张博闻 张树川 徐军 于 2020-03-20 设计创作，主要内容包括：本发明公开了一种管道式荒煤气预冷系统及其预冷方法,系统包括连接在出气井井口与煤气输送管网之间的荒煤气冷却管段,雾化喷嘴设置在所述荒煤气冷却管段上并与供水管连接。循环水泵的进水端与水容器连接,出水端与循环水管道的一端连接。循环水管道与供水管连接,温度传感器设置在荒煤气冷却管段上。本发明所提供的管道式荒煤气预冷系统及其预冷方法,采用雾化水降温,增大了与荒煤气换热的相界面,强化了换热效果,减少了因高温煤气直接进入煤气管网,可能导致的管网热力破坏。本发明所提供的管道式荒煤气预冷系统,结构简化,操作简便,效果显著。(The invention discloses a pipeline type raw gas precooling system and a precooling method thereof. The water inlet end of the circulating water pump is connected with the water container, and the water outlet end of the circulating water pump is connected with one end of the circulating water pipeline. The circulating water pipeline is connected with the water supply pipe, and the temperature sensor is arranged on the raw coke oven gas cooling pipe section. According to the pipeline type raw gas precooling system and the precooling method thereof, provided by the invention, atomized water is adopted for cooling, so that the phase interface for heat exchange with raw gas is increased, the heat exchange effect is enhanced, and the possible thermal damage of a pipe network caused by the fact that high-temperature gas directly enters the gas pipe network is reduced. The pipeline type raw gas precooling system provided by the invention has the advantages of simple structure, simplicity and convenience in operation and remarkable effect.)

1. A pipeline type raw gas precooling system is characterized by comprising:

the raw gas cooling pipe section is connected between the wellhead of the gas outlet well and a gas conveying pipe network;

a water atomization device including an atomization nozzle and a water supply pipe; the atomization nozzle is arranged on the raw coke oven gas cooling pipe section; one end of the atomizing nozzle is arranged in the raw gas cooling pipe section, and the other end of the atomizing nozzle is connected with one end of a water supply pipe;

the circulating water reflux device comprises a circulating water pump, a circulating water pipeline and a water container; the water inlet end of the circulating water pump is connected with the water container, and the water outlet end of the circulating water pump is connected with one end of the circulating water pipeline; the circulating water pipeline is connected with the water supply pipe;

and the temperature sensor is arranged on the raw gas cooling pipe section.

2. The ducted raw gas precooling system of claim 1, wherein the plurality of atomizing nozzles are evenly distributed along an axial direction and a radial direction of the raw gas cooling duct section.

3. The ducted raw gas precooling system according to claim 1, wherein a flow meter is provided on the circulating water duct.

4. The ducted raw gas precooling system according to claim 3, wherein an automatic regulating valve is provided on the circulating water duct; the automatic regulating valve can automatically regulate the flow of circulating water according to data measured by each sensor.

5. The ducted raw gas precooling system according to claim 4, wherein the temperature sensor, the flow meter, and the automatic regulating valve are all electrically connected to the controller.

6. The ducted raw gas precooling system according to claim 5, wherein the controller is a programmable controller or a single chip microcomputer.

7. The ducted raw gas precooling system of claim 3, wherein the flow meter is a throttling flow meter or an electromagnetic flow meter.

8. The ducted raw gas precooling system of claim 1, wherein the temperature sensor is a thermal resistance temperature sensor.

9. The ducted raw gas precooling system according to any one of claims 1 to 8, wherein a precooling method comprises the following steps:

enabling high-temperature raw gas to flow out of the mouth of the gas outlet well and enter a raw gas cooling pipe section; in the raw gas cooling pipe section, the pressurized circulating cooling water is atomized into water mist through an atomizing nozzle and then directly sprayed into the high-temperature raw gas; sending the precooled raw gas into a gas conveying pipe network, sending the raw gas to a raw gas cooling section for further cooling, and removing water in the raw gas; the removed sewage is sent to a water container, pressurized by a circulating water pump, sent to each gas outlet well water supply pipe by a circulating water pipeline, sprayed to the raw gas again by an atomizing nozzle, and precooled continuously.

Technical Field

The invention relates to an underground coal gasification device, in particular to a pipeline type raw coke oven gas precooling system and a precooling method thereof.

Background

In the underground coal gasification process, oxygen in the gasification agent and a coal bed are subjected to combustion and gasification reaction, and the temperature of the generated raw coke oven gas can reach about 500-1000 ℃. And in the process that the raw gas leaving the reaction area flows out of the gas outlet well to the ground through the gas collection channel, the temperature of the raw gas is reduced to about 350 ℃ after the raw gas exchanges heat with the channel coal coke, the surrounding rocks, the ash layer and the wall rock layer of the gas outlet well. If the raw gas with high temperature directly enters the gas conveying pipe network, the pipe network can be caused to generate larger thermal stress deformation, so that the local pipeline and the pipe fitting are cracked and damaged, and the long-term safe operation of the gas pipe network is not facilitated. Therefore, in order to improve the safety of conveying the high-temperature raw gas, the temperature of the raw gas needs to be reduced.

Disclosure of Invention

The invention aims to provide a pipeline type raw coke oven gas precooling system and a precooling method thereof, which utilize the characteristic that water mist is easy to gasify to atomize cooling water and then directly spray the atomized cooling water into raw coke oven gas. When the low-temperature water mist meets high-temperature raw gas, the low-temperature water mist quickly absorbs heat and evaporates to change the liquid phase into the gas phase, so that the temperature of the raw gas is reduced, and the aim of pre-cooling the raw gas is fulfilled.

In order to achieve the above purpose, the invention provides the following technical scheme:

a ducted raw gas precooling system, comprising:

the raw gas cooling pipe section is connected between the wellhead of the gas outlet well and a gas conveying pipe network;

the water atomization device comprises an atomization nozzle and a water supply pipe, and the atomization nozzle is arranged on the raw coke oven gas cooling pipe section; one end of the atomizing nozzle is arranged in the raw gas cooling pipe section, and the other end of the atomizing nozzle is connected with one end of a water supply pipe;

the circulating water reflux device comprises a circulating water pump, a circulating water pipeline and a water container; the water inlet end of the circulating water pump is connected with the water container, and the water outlet end of the circulating water pump is connected with one end of the circulating water pipeline; the circulating water pipeline is connected with the water supply pipe;

and the temperature sensor is arranged on the raw gas cooling pipe section.

Preferably, the number of the atomizing nozzles is multiple, and the atomizing nozzles are uniformly distributed along the axial direction and the radial direction of the raw coke oven gas cooling pipe section.

Preferably, a flow meter is arranged on the circulating water pipeline.

Preferably, an automatic regulating valve is arranged on the circulating water pipeline; the automatic regulating valve can automatically regulate the flow of circulating water according to data measured by each sensor.

Preferably, the temperature sensor, the flow meter and the automatic regulating valve are all electrically connected with the controller.

Preferably, the controller is a programmable controller or a single chip microcomputer.

Preferably, the flow meter is a throttling flow meter or an electromagnetic flow meter.

Preferably, the temperature sensor is a thermal resistance type temperature sensor.

The pipeline type raw coke oven gas precooling system comprises the precooling method as follows:

enabling high-temperature raw gas to flow out of the mouth of the gas outlet well and enter a raw gas cooling pipe section; in the raw gas cooling pipe section, the pressurized circulating cooling water is atomized into water mist through an atomizing nozzle and then directly sprayed into the high-temperature raw gas; sending the precooled raw gas into a gas conveying pipe network, sending the raw gas to a raw gas cooling section for further cooling, and removing water in the raw gas; the removed sewage is sent to a water container, pressurized by a circulating water pump, sent to each gas outlet well water supply pipe by a circulating water pipeline, sprayed to the raw gas again by an atomizing nozzle, and precooled continuously.

According to the pipeline type raw gas precooling system and the precooling method thereof, provided by the invention, atomized water is adopted for cooling, so that the phase interface for heat exchange with raw gas is increased, the heat exchange effect is enhanced, and the possible thermal damage of a pipe network caused by the fact that high-temperature gas directly enters the gas pipe network is reduced. The pipeline type raw gas precooling system provided by the invention has the advantages of simple structure, simplicity and convenience in operation and remarkable effect.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

Fig. 1 is a structural diagram of a pipeline-type raw gas pre-cooling system according to an embodiment of the present invention.

Description of reference numerals:

1. cooling the pipe section by using the raw gas; 2. a well head of the gas outlet well; 3. a gas conveying pipe network; 4. an atomizing nozzle; 5. a water supply pipe; 6. a water circulating pump; 7. a circulating water pipeline; 8. a water container; 9. a temperature sensor; 10. a flow meter; 11. an automatic regulating valve; 12. and a controller.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.

As shown in fig. 1, a ducted raw gas precooling system includes:

the raw gas cooling pipe section 1 is connected between a gas outlet well mouth 2 and a gas conveying pipe network 3;

the water atomization device comprises an atomization nozzle 4 and a water supply pipe 5, wherein the atomization nozzle 4 is arranged on the raw coke oven gas cooling pipe section 1; one end of the atomizing nozzle 4 is arranged in the raw gas cooling pipe section 1, and the other end is connected with one end of a water supply pipe 5;

the circulating water reflux device comprises a circulating water pump 6, a circulating water pipeline 7 and a water container 8; the water inlet end of the circulating water pump 6 is connected with the water container 8, and the water outlet end of the circulating water pump is connected with one end of the circulating water pipeline 7; the circulating water pipeline 7 is connected with the water supply pipe 5;

and the temperature sensor 9 is arranged on the raw gas cooling pipe section 1.

Specifically, the pipeline type raw coke oven gas precooling system comprises a raw coke oven gas cooling pipe section 1, a water atomization device and a circulating water reflux device.

The raw gas cooling pipe section 1 is arranged between each gas outlet well mouth 2 and the gas conveying pipe network 3, one end of the raw gas cooling pipe section is connected with the gas outlet well mouth 2, the other end of the raw gas cooling pipe section is connected with the gas conveying pipe network 3, and high-temperature raw gas flowing out of the gas outlet well 2 can be sent into the gas conveying pipe network 3 after being cooled.

The water atomization device at least comprises an atomization nozzle 4 and a water supply pipe 5, and the water atomization device can enable the pressurized cooling water to be sent into the atomization nozzle 4 through the water supply pipe 5 and sprayed into the high-temperature raw coke oven gas. The atomizing nozzle 4 is arranged on the raw coke oven gas cooling pipe section 1. One end of the atomizing nozzle 4 is arranged in the raw gas cooling pipe section 1, and the other end is connected with one end of a cooling water supply pipe 5. The specific number of the atomizing nozzles 4 is determined according to the flow rate and temperature of the raw gas, the temperature and flow rate of cooling water, the structural form of the atomizing nozzles and the like. When a plurality of atomizing nozzles 4 are used, the atomizing nozzles can be uniformly distributed in the axial direction (as shown in fig. 1) and the radial direction of the raw gas cooling pipe section.

The circulating water reflux device at least comprises a circulating water pump 6, a circulating water pipeline 7 and a water container 8 (the water container 8 can adopt a circulating water pool or a water tank). The circulating water reflux device can collect the moisture in the raw coke oven gas, and the raw coke oven gas is pressurized by the circulating water pump 6 and then sent into the circulating water pipeline 7 for pre-cooling, cooling and recycling of the high-temperature raw coke oven gas, so that water resources can be saved. The water container 8 is used for collecting moisture in the raw coke oven gas. The water inlet end of the circulating water pump 6 is connected with the water container 8, and the water outlet end is connected with one end of the circulating water pipeline 7. The other end of the circulating water pipeline 7 is connected with the water supply pipe 5 of each gas outlet well.

The work flow of the system is as follows: high-temperature raw gas flows out of the well mouth 2 of the gas outlet well and enters the raw gas cooling pipe section 1. In the raw gas cooling pipe section 1, the pressurized circulating cooling water is atomized into water mist (with the size of micron order) by the atomizing nozzle 4 and then directly sprayed into the high-temperature raw gas. When the low-temperature water mist meets high-temperature raw gas, the low-temperature water mist quickly absorbs heat and evaporates, and changes from a liquid phase to a gas phase, so that the temperature of the raw gas is reduced (for example, to 85 ℃). The precooled raw gas enters a gas conveying pipe network 3, and is sent to a raw gas cooling section (such as a washing tower, not shown in the figure) for further cooling (such as cooling to 25 ℃), and then the moisture in the raw gas is removed. The removed sewage flows out to a water container 8 (a circulating water tank or a water tank), is pressurized by a circulating water pump 6, is sent to each gas outlet well water supply pipe 5 by a circulating water pipeline 7, is sprayed into the raw coke oven gas again by an atomizing nozzle 4, and is continuously precooled, so that the cooling water is recycled.

In a further improvement, the pipeline type raw coke oven gas precooling system further comprises a sensor and an automatic regulating valve. The sensors are respectively arranged on the raw gas cooling pipe section 1 and the circulating water pipeline 7, wherein at least one group of temperature sensors 9 are arranged on the raw gas cooling pipe section 1, and at least one group of flow meters (or flow sensors) 10 are arranged on the circulating water pipeline 7 and are respectively used for measuring the temperature before and after the high-temperature raw gas is pre-cooled and the flow of the circulating water. The automatic regulating valve 11 is arranged on the circulating water pipeline 7, and can control the regulating valve 11 to automatically regulate the flow of circulating water after being compared and calculated by the controller according to data measured by each sensor. The flow meter 10 is preferably a throttling flow meter or an electromagnetic flow meter. The temperature sensor 9 is preferably a thermal resistance type temperature sensor.

In a further improvement, the ducted raw gas pre-cooling system further includes a controller 12. The rear end of each sensor is electrically connected to the input of the controller 12. The output end of the controller 12 is electrically connected with the automatic regulating valve 11. Preferably, the communication end of the controller 12 is also in bidirectional signal electrical connection with the communication end of the remote control operation background, so that the flow of circulating water can be remotely adjusted and the running state of the system can be monitored. The controller 12 is preferably a programmable controller or a single chip microcomputer.

According to the pipeline type raw gas precooling system and the precooling method thereof, atomized water is adopted for cooling, the phase interface for heat exchange with raw gas is increased, the heat exchange effect is enhanced, and the possible thermal damage of a pipe network caused by the fact that high-temperature gas directly enters the gas pipe network is reduced. The pipeline type raw gas precooling system is simple in structure, simple and convenient to operate and remarkable in effect.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.