Utilization method of cooling circulating water of analysis sampler at outlet of washing tower of coal water slurry gasification furnace

Abstract

The invention relates to the technical field of waste heat utilization, in particular to a method for utilizing cooling circulating water of an analytical sampler at an outlet of a washing tower of a water-coal-slurry gasification furnace, which comprises the following steps: the circulating water enters the analytical sampler at the outlet of the washing tower of the gasification furnace; after the circulating water absorbs heat and is heated, the heated circulating water enters the temperature tracing pipeline through the cooling circulating water pipeline; the temperature tracing pipeline is connected to the analysis sampling pipeline in a winding manner, the heating circulating water provides heat for the analysis sampling pipeline through the pipe wall of the temperature tracing pipeline, and then the heating circulating water becomes cooling circulating water; the process gas in the gasification furnace enters an analysis sampler, and the cooled and extracted gas sample enters an analysis instrument for analysis and detection. The heating circulating water generated after the analysis sampler is cooled is directly used for heat tracing of the analysis sampling pipeline, waste heat absorbed by the circulating water is fully recycled, a heat tracing device does not need to be additionally arranged, the temperature of a gas sample in the sampling pipeline can be effectively maintained, and condensation of easily-condensed components in the sample due to temperature reduction is avoided.

Description

Technical Field

[0001] This invention relates to the field of waste heat utilization technology, and in particular to a method for utilizing the cooling circulating water of the outlet sampler of the washing tower in a coal-water slurry gasifier. Background Technology

[0002] Coal-water slurry gasification technology is one of the core technologies in modern coal chemical industry. It involves gasifying coal-water slurry with oxygen under high temperature and pressure to generate syngas, primarily composed of carbon monoxide and hydrogen, providing raw materials for subsequent processes such as methanol synthesis, ammonia synthesis, and Fischer-Tropsch synthesis. In the coal-water slurry gasification process, component analysis of the process gas exiting the gasifier's scrubbing tower is crucial for monitoring the gasification reaction effect and ensuring stable and safe production. The relevant analytical data directly guides the adjustment of gasifier operating parameters, such as the oxygen-to-coal ratio, gasification pressure, and temperature. To achieve accurate analysis of the process gas exiting the scrubbing tower, gas samples must be extracted from the process pipeline using an analytical sampler. Since the process gas exiting the scrubbing tower typically maintains a high temperature and contains a certain amount of water vapor and trace impurities, direct entry into the analytical instrument could lead to instrument damage and inaccurate analysis results. Therefore, it is essential to cool the process gas within the analytical sampler. Currently, the industry commonly uses circulating water cooling, where the flow of circulating water within the analytical sampler absorbs the heat from the process gas, achieving gas cooling.

[0003] Currently, after completing its cooling task, this portion of the circulating water is typically discharged directly or returned to the circulating water system, resulting in a waste of heat. Meanwhile, the analytical sampling pipeline needs to maintain a certain temperature to prevent sample condensation or crystallization within the pipeline, which would affect the accuracy of the analytical results. Existing temperature tracing methods often require additional energy consumption. Therefore, how to effectively utilize the heat from the analytical sampler's cooling circulating water to achieve secondary energy utilization is a problem that urgently needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a method for utilizing the cooling circulating water of the analytical sampler at the outlet of the washing tower of a coal-water slurry gasifier. The heated circulating water generated after the analytical sampler is cooled is directly used for the temperature tracing of the analytical sampling pipeline, which fully recovers and utilizes the waste heat absorbed by the circulating water. No additional heating device is required, which can effectively maintain the temperature of the gas sample in the sampling pipeline and prevent easily condensable components in the sample from condensing due to temperature reduction.

[0005] To achieve the above objectives, the present invention provides a method for utilizing the cooling circulating water of the analyzer at the outlet of the washing tower of a coal-water slurry gasifier, comprising the following steps: S1. An analytical sampler is installed at the outlet of the gasifier scrubbing tower. Circulating water enters the analytical sampler to cool the process gas inside the analytical sampler. S2. The heated circulating water, after absorbing heat and increasing in temperature, flows out of the circulating water outlet of the analytical sampler and enters the temperature tracing pipe through the cooling circulating water pipe. S3. The heating pipe is wound and connected to the analysis and sampling pipeline. The heating circulating water flows in the heating pipe. At the same time, the heating circulating water provides heat to the analysis and sampling pipeline through the pipe wall of the heating pipe. Then the heating circulating water becomes cooling circulating water. S4. The process gas in the gasifier enters the analyzer sampler. The gas sample extracted by cooling enters the analyzer sampling line. The analyzer sampling line absorbs heat to keep the sample inside in a gaseous state. The gas sample enters the analyzer for analysis and detection.

[0006] Preferably, in S2, the circulating water outlet of the analytical sampler is connected to the cooling circulating water pipe, and the cooling circulating water pipe is connected to the temperature tracing pipe through a connecting pipe.

[0007] Preferably, in S2, the temperature tracing pipe is equipped with a temperature sensor to detect the temperature of the temperature tracing pipe.

[0008] Preferably, in S3, the cooling circulating water is returned to the circulating water inlet of the analytical sampler.

[0009] Preferably, in S4, the analytical sampling pipeline is equipped with a second temperature sensor to detect the temperature of the analytical sampling pipeline.

[0010] Preferably, temperature sensor one and temperature sensor two are electrically connected to the controller, and the controller controls the amount of heated circulating water entering the temperature tracing pipe based on the temperature data of temperature sensor two.

[0011] Therefore, the present invention utilizes the above-mentioned method for the utilization of cooling circulating water from the outlet sampler of the coal-water slurry gasifier washing tower, and its beneficial effects are as follows: 1. This invention uses the heated circulating water generated after the analytical sampler is cooled down to directly apply to the temperature tracing of the analytical sampling pipeline, which fully recovers and utilizes the waste heat absorbed by the circulating water and avoids energy waste caused by direct discharge or backflow of waste heat. 2. In this invention, the heating circulating water continuously heats the analysis and sampling pipeline through a heating pipe, eliminating the need for additional heating devices. This effectively maintains the temperature of the gas sample in the sampling pipeline, preventing easily condensable components in the sample from condensing due to temperature drop, and ensuring that the gas sample is delivered to the analytical instrument in a stable gaseous state. 3. By setting up temperature sensor one, temperature sensor two, and a controller, this invention can monitor the temperature of the temperature tracing pipeline and the temperature of the analysis and sampling pipeline in real time, and dynamically adjust the amount of heating circulating water entering the temperature tracing pipeline according to the actual temperature requirements of the analysis and sampling pipeline, thereby achieving precise control of the temperature tracing.

[0012] The technical solution of the present invention will be further described in detail below through embodiments. Detailed Implementation

[0013] The present invention will be further described below with reference to embodiments. Unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art. The features mentioned above or in the specific examples mentioned in this invention can be combined arbitrarily, and these specific embodiments are only used to illustrate the invention and are not intended to limit the scope of the invention.

[0014] This invention provides a method for utilizing the cooling circulating water of the analyzer sampler at the outlet of a coal-water slurry gasifier scrubbing tower, comprising the following steps: S1. An analytical sampler is installed at the outlet of the gasifier scrubbing tower. Circulating water enters the analytical sampler to cool the process gas inside the analytical sampler. S2. The heated circulating water, after absorbing heat and increasing in temperature, flows out of the circulating water outlet of the analytical sampler and enters the temperature tracing pipe through the cooling circulating water pipe. S3. The heating pipe is wound and connected to the analysis and sampling pipeline. The heating circulating water flows in the heating pipe. At the same time, the heating circulating water provides heat to the analysis and sampling pipeline through the pipe wall of the heating pipe. Then the heating circulating water becomes cooling circulating water. S4. The process gas in the gasifier enters the analyzer sampler. The gas sample extracted by cooling enters the analyzer sampling line. The analyzer sampling line absorbs heat to keep the sample inside in a gaseous state. The gas sample enters the analyzer for analysis and detection.

[0015] By implementing a closed-loop process of cooling circulating water absorbing heat, heating circulating water tracing, and circulating water cooling and returning, the waste heat of cooling circulating water can be recovered and utilized in a coordinated manner, while meeting the temperature tracing requirements of the analysis and sampling pipeline.

[0016] In some embodiments of the present invention, in S2, the circulating water outlet of the analytical sampler is connected to the cooling circulating water pipe, and the cooling circulating water pipe is connected to the temperature tracing pipe through a connecting pipe.

[0017] In some embodiments of the present invention, in step S2, the temperature tracing pipe is equipped with a temperature sensor to detect the temperature of the temperature tracing pipe. The detection end of the temperature sensor is in close contact with the pipe wall of the temperature tracing pipe, and the temperature data of the pipe wall is collected in real time, providing basic data for judging the temperature tracing effect of the circulating water.

[0018] In some embodiments of the present invention, in step S3, the cooling circulating water returns to the circulating water inlet of the analytical sampler. After releasing heat in the heat tracing pipe, it becomes cooling circulating water, returns to the circulating water inlet of the analytical sampler, re-enters the heat exchange channel inside the analytical sampler, and is used again for cooling the process gas, forming a closed loop of analytical sampler-cooling circulating water pipe-heat tracing pipe-analytical sampler.

[0019] In some embodiments of the present invention, in step S4, the analytical sampling pipeline is equipped with a second temperature sensor to detect the temperature of the analytical sampling pipeline. The detection end of the second temperature sensor is in close contact with the pipe wall of the analytical sampling pipeline, and the temperature data of the gas sample in the analytical sampling pipeline is collected in real time to accurately obtain the actual temperature of the gas sample during the transportation process and determine whether condensation will occur.

[0020] In some embodiments of the present invention, temperature sensor one and temperature sensor two are electrically connected to a controller. The controller controls the flow rate of the heating circulating water entering the heating tracing pipeline based on the temperature data from temperature sensor two. If the temperature in the sampling pipeline is lower than the target value, the flow rate of the heating circulating water entering the heating tracing pipeline is increased to enhance the heat output. If the actual temperature is higher than the upper limit of the target temperature, the flow rate of the heating circulating water entering the heating tracing pipeline is reduced to decrease the heat output.

[0021] Example S1. An analytical sampler is installed at the outlet of the gasifier scrubbing tower. Circulating water enters the analytical sampler to cool the process gas inside.

[0022] S2. The circulating water outlet of the analyzer is connected to the cooling circulating water pipe, which is connected to the temperature tracing pipe via a connecting pipe. The heated circulating water, after absorbing heat, flows out of the analyzer's circulating water outlet and enters the temperature tracing pipe via the cooling circulating water pipe. The temperature tracing pipe is equipped with a temperature sensor to detect its temperature.

[0023] S3. The heating pipe is wound and connected to the analysis and sampling pipeline. The heating circulating water flows in the heating pipe. At the same time, the heating circulating water provides heat to the analysis and sampling pipeline through the pipe wall of the heating pipe. Then the heating circulating water becomes cooling circulating water and returns to the circulating water inlet of the analysis sampler.

[0024] S4. The process gas from the gasifier enters the analyzer sampler. The cooled and extracted gas sample enters the analyzer sampling line. The analyzer sampling line absorbs heat, keeping the sample in a gaseous state. The gas sample then enters the analyzer for analysis and detection. The analyzer sampling line is equipped with a second temperature sensor to monitor its temperature. Temperature sensors one and two are electrically connected to the controller, which controls the flow rate of the circulating water entering the temperature tracing pipeline based on the temperature data from temperature sensor two.

[0025] Therefore, the present invention adopts the above-mentioned method of utilizing the cooling circulating water of the analyzer sampler at the outlet of the coal-water slurry gasifier washing tower. The heated circulating water generated after the analyzer sampler is cooled is directly used for the temperature tracing of the analyzer sampling pipeline, which fully recovers and utilizes the waste heat absorbed by the circulating water. There is no need to add an additional heating device, which can effectively maintain the temperature of the gas sample in the sampling pipeline and prevent easily condensable components in the sample from condensing due to the temperature drop.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for utilizing the cooling circulating water of the outlet sampler at the scrubbing tower of a coal-water slurry gasifier, characterized in that: The method comprises the following steps: S1, an analysis sampler is arranged at the outlet of the gasification furnace scrubbing tower, and the circulating water enters the analysis sampler to cool the process gas in the analysis sampler; S2, the heated circulating water flows out from the circulating water outlet of the analysis sampler, enters the temperature-maintaining pipeline through the cooling circulating water pipeline, and becomes the cooling circulating water; S3, the temperature-maintaining pipeline is wound and connected to the analysis sampling pipeline, the heated circulating water flows in the temperature-maintaining pipeline, and the heated circulating water provides heat for the analysis sampling pipeline through the wall of the temperature-maintaining pipeline, and then the heated circulating water becomes the cooling circulating water; S4, the process gas in the gasification furnace enters the analysis sampler, the extracted gas sample is cooled and enters the analysis sampling pipeline, the analysis sampling pipeline absorbs heat to keep the sample in the gas state, and the gas sample enters the analysis instrument for analysis and detection.

2. The method according to claim 1, wherein the temperature of the circulating water is lowered by using the water from the outlet of the scrubbing tower of the coal water slurry gasifier. In S2, the circulating water outlet of the analysis sampler is communicated with the cooling circulating water pipeline, and the cooling circulating water pipeline is communicated with the temperature-maintaining pipeline through the connecting pipeline.

3. The method of claim 1, wherein the temperature of the circulating water is lowered by using a heat exchanger. In S2, the temperature-maintaining pipeline is provided with a temperature sensor one for detecting the temperature of the temperature-maintaining pipeline.

4. The method of claim 1, wherein the temperature of the circulating water is lowered by using a heat exchanger. In S3, the cooling circulating water returns to the circulating water inlet of the analysis sampler.

5. The method of claim 3, wherein the temperature of the circulating water is reduced by using a heat exchanger. In S4, the analysis sampling pipeline is provided with a temperature sensor two for detecting the temperature of the analysis sampling pipeline.

6. The method of claim 5, wherein the temperature of the circulating water is reduced by using a heat exchanger. The temperature sensor one and the temperature sensor two are electrically connected with the controller, and the controller controls the water quantity of the heated circulating water entering the temperature-maintaining pipeline according to the temperature data of the temperature sensor two.