Fuel gas thermal desorption device

Abstract

The utility model discloses a fuel gas thermal desorption device, which comprises an intelligent control system PLC (programmable logic controller), an electric cabinet and a thermal desorption device, the electric cabinet is used for controlling the combustion process and providing a heat source and an air source for the combustion head; the combustion head is used for providing a natural gas combustion space; a fuel gas introduction pipeline, a primary air introduction pipeline and a secondary air introduction pipeline are connected to the upper part of the combustion head; a fire observation hole is formed in the combustion head; the combustion head is connected with a high-temperature fan through a flue gas pipeline; wherein the flue gas pipeline comprises an overground flue gas pipeline part and an underground flue gas pipeline part, and the underground flue gas pipeline part is used for heating surface soil which is not prone to temperature rise through waste heat; the covering sealing layer covers the soil to be treated; and the heating well is connected to the combustion head.

Description

Technical Field

[0001] The utility model belongs to the field of soil and groundwater restoration, and in particular relates to a fuel gas thermal desorption device. Background Art

[0002] In-situ thermal desorption technology is a highly effective soil remediation method, particularly suitable for treating organic pollutants such as chlorinated organic compounds (CVOCs), semi-volatile organic compounds (SVOCs), petroleum hydrocarbons (TPHs), polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and pesticides. In-situ gas heating technology uses natural gas as a heating energy source, with the high-temperature flue gas generated by natural gas combustion as the heat source. This technology utilizes the thermal conductivity of soil and groundwater to achieve heating and in-situ remediation of contaminated soil and groundwater.

[0003] As a soil and groundwater treatment technology, in-situ thermal desorption technology has the advantages of being green, efficient, thorough, and free of secondary pollution. However, it currently has the following drawbacks:

[0004] (1) High-temperature flue gas is directly discharged into the atmosphere from the electrode well, resulting in energy waste;

[0005] (2) The surface soil is in direct contact with the air, and the evaporation of water on the soil surface will take away a large amount of heat. At the same time, if the temperature measuring point in the surface soil is too close to the soil surface and is almost flush with the upper part of the heating end of the heating rod, heat will easily dissipate to the surface, making it difficult to increase the temperature of the surface soil. At the same time, the water content in the soil has a significant effect on heat conduction. When there is a large amount of water in the soil, the water will move downward, bringing heat from the high-temperature area in the middle to the bottom, thereby reducing the temperature of the surface soil. In addition, water will also form low-melting boiling point substances with some organic pollutants, increasing the difficulty of thermal desorption. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the utility model provides a fuel gas thermal desorption device.

[0007] To achieve the above-mentioned purpose, the technical solution of the present invention is: a fuel gas thermal desorption device, the device comprising:

[0008] Intelligent control system PLC, used to control the electric control box; the electric control box is used to control the combustion process and provide heat and gas sources for the combustion head;

[0009] A combustion head is used to provide a space for natural gas combustion; a gas inlet pipe, a primary air inlet pipe, and a secondary air inlet pipe are connected above the combustion head; a fire viewing hole is provided on the combustion head; the combustion head is connected to a high-temperature blower via a flue gas pipeline; wherein the flue gas pipeline includes an above-ground flue gas pipeline portion and an underground flue gas pipeline portion, wherein the underground flue gas pipeline portion is used to utilize waste heat to heat the surface soil that is difficult to heat up;

[0010] A cover sealing layer is provided, wherein the cover sealing layer is provided on top of the soil to be treated; and

[0011] A heating well is connected to the burner head.

[0012] Furthermore, the electric control box includes an igniter, a flame controller, a quick shut-off valve, and a linear regulating valve;

[0013] Wherein, the igniter is used to ignite the natural gas introduced into the combustion head;

[0014] The flame controller is used to monitor the flame state;

[0015] The quick shut-off valve is used to quickly cut off the gas source after detecting automatic ignition failure or when the flame needs to be shut off;

[0016] The linear regulating valve is used to adjust the flame size.

[0017] Furthermore, the gas inlet pipeline is provided with a natural gas inlet flow meter and a natural gas electric regulating valve;

[0018] The primary air inlet pipe is provided with a primary air inlet flow meter and a primary air manual valve;

[0019] The secondary air inlet pipeline is provided with a secondary air intake flow meter and a secondary air electric regulating valve.

[0020] Furthermore, the natural gas electric regulating valve and the secondary air electric regulating valve are controlled by the intelligent control system PLC to adjust the air-fuel ratio A / F.

[0021] Furthermore, a first pressure transmitter and a first thermometer are provided at the inlet end of the flue gas pipeline;

[0022] The outlet end of the flue gas pipeline is provided with a second pressure transmitter and a second thermometer.

[0023] Furthermore, the heating well includes an inner tube and an outer tube, wherein the inner tube is a hollow pipe, and the high-temperature flue gas generated by the combustion head enters the outer tube from the bottom of the inner tube, thereby heating the surrounding soil and groundwater.

[0024] Furthermore, a plurality of temperature monitoring wells are arranged around the heating well, and the depths of the heating well and the temperature monitoring well are the same.

[0025] Furthermore, a thermocouple is installed at every unit distance in the heating well and the temperature monitoring well.

[0026] Furthermore, the high-temperature fan is used to extract high-temperature flue gas from the heating well, and the high-temperature fan is coupled to the frequency converter;

[0027] The inlet and outlet temperatures of the underground smoke pipe are monitored respectively by the first thermometer and the second thermometer, and the frequency converter is controlled by the intelligent control system PLC to adjust the exhaust flow of the high-temperature fan.

[0028] Furthermore, the intelligent control system PLC is also coupled to a human-computer interaction screen, which is used to display data collected by the natural gas intake flow meter, the primary air intake flow meter, the secondary air intake flow meter, the first pressure transmitter, the first thermometer, the second pressure transmitter, the second thermometer, and the thermocouples in the heating well and the temperature monitoring well.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] (1) The utility model improves the design of the combustion head and the flue gas pipeline, and controls the natural gas electric regulating valve and the secondary air electric regulating valve through the intelligent control system PLC to adjust the air-fuel ratio A / F, so that the natural gas combustion reaches the maximum efficiency, burns fully and obtains the maximum heat.

[0031] (2) The utility model designs an underground flue gas pipeline part for utilizing waste heat to heat the surface soil which is difficult to heat up; thereby realizing the utilization of waste heat of high-temperature flue gas and solving the defect of in-situ thermal desorption technology that the surface soil temperature is difficult to reach the standard.

[0032] (3) The utility model provides a covering sealing layer above the soil to be treated to reduce heat dissipation of the surface soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0034] Figure 1 This is a schematic structural diagram of a fuel gas thermal desorption device provided in an embodiment of the present utility model.

[0035] In the figure, 1-electric control box, 2-combustion head, 3-cover sealing layer, 4-heating well, 5-temperature monitoring well, 6-flue gas pipeline, 7-natural gas electric regulating valve, 8-primary air manual valve, 9-secondary air electric regulating valve, 10-natural gas intake flow meter, 11-primary air intake flow meter, 12-secondary air intake flow meter, 13-first pressure transmitter, 14-first thermometer, 15-intelligent control system PLC, 16-second pressure transmitter, 17-second thermometer, 18-high temperature fan, 19-frequency converter. DETAILED DESCRIPTION

[0036] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0037] The terms used in this utility model are for the purpose of describing specific embodiments only and are not intended to limit the utility model. As used in this utility model and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0038] It should be understood that although the terms first, second, third, etc. may be used in this utility model to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, first information can also be referred to as second information without departing from the scope of this utility model, and similarly, second information can also be referred to as first information. Depending on the context, the word "if" as used herein can be interpreted as "when...", "when...", or "in response to determining."

[0039] The present invention will be described in detail below with reference to the accompanying drawings. Unless there is any conflict, the features of the following embodiments and implementations may be combined with each other.

[0040] like Figure 1 As shown, the utility model provides a fuel gas thermal desorption device, the device comprising:

[0041] The intelligent control system PLC15 is used to control the electric control box 1; the electric control box 1 is used to control the combustion process and provide heat and gas sources for the combustion head 2;

[0042] Furthermore, the electrical control box 1 includes an igniter, a flame controller, a quick shut-off valve, and a linear regulating valve; wherein the igniter is used to ignite the natural gas introduced into the combustion head 2; the flame controller is used to monitor the flame state; the quick shut-off valve is used to quickly cut off the gas source after detecting that the automatic ignition fails or when the flame needs to be shut down; the linear regulating valve is used to adjust the flame size.

[0043] The combustion head 2 is used to provide a space for natural gas combustion.

[0044] Furthermore, a gas inlet pipe, a primary air inlet pipe, and a secondary air inlet pipe are connected above the combustion head 2; a natural gas intake flow meter 10 and a natural gas electric regulating valve 7 are provided on the gas inlet pipe; a primary air intake flow meter 11 and a primary air manual valve 8 are provided on the primary air inlet pipe; and a secondary air intake flow meter 12 and a secondary air electric regulating valve 9 are provided on the secondary air inlet pipe.

[0045] Furthermore, a fire observation hole is provided on the combustion head 2 for detecting the air-fuel ratio A / F; in this example, the natural gas electric regulating valve 7 and the secondary air electric regulating valve 9 are controlled by the intelligent control system PLC15 to adjust the air-fuel ratio A / F so that the natural gas combustion reaches maximum efficiency, burns fully and obtains maximum heat.

[0046] Furthermore, the burner head 2 is connected to the high-temperature blower 18 via the flue gas pipeline 6;

[0047] Among them, the flue gas pipeline 6 includes an above-ground flue gas pipeline part and an underground flue gas pipeline part. The underground flue gas pipeline part is used to utilize waste heat to heat the surface soil that is not easy to heat up, thereby realizing the utilization of waste heat of high-temperature flue gas, and at the same time solving the defect that the surface soil temperature is difficult to meet the standard in the in-situ thermal desorption technology; the inlet end of the flue gas pipeline 6 is provided with a first pressure transmitter 13 and a first thermometer 15; the outlet end of the flue gas pipeline 6 is provided with a second pressure transmitter 16 and a second thermometer 17.

[0048] Among them, the high-temperature fan 18 is used to extract the high-temperature flue gas in the heating well 4, and the high-temperature fan 18 is coupled to the frequency converter 19; the first thermometer 15 and the second thermometer 17 respectively monitor the inlet and outlet temperatures of the underground flue gas pipeline, so as to control the frequency converter 19 through the intelligent control system PLC15 to adjust the extraction flow of the high-temperature fan 18.

[0049] The covering sealing layer 3 is covered on the soil to be treated to reduce heat dissipation of the surface soil.

[0050] A heating well 4 is connected to the burner head 2. The heating well 4 comprises an inner tube and an outer tube. The inner tube is a hollow pipe. The high-temperature flue gas generated by the burner head 2 enters the outer tube from the bottom of the inner tube, thereby heating the surrounding soil and groundwater. Several temperature monitoring wells 5 are arranged around the heating well 4. The heating well 4 and the temperature monitoring wells 5 have the same depth. A thermocouple is installed at every unit distance between the heating well 4 and the temperature monitoring well 5.

[0051] Furthermore, the intelligent control system PLC15 is also coupled to a human-computer interaction screen, which is used to display data collected by the natural gas intake flow meter 10, the primary air intake flow meter 11, the secondary air intake flow meter 12, the first pressure transmitter 13, the first thermometer 14, the second pressure transmitter 16, the second thermometer 17, and the thermocouples in the heating well 4 and the temperature monitoring well 5.

[0052] Next, the working process of the gas thermal desorption device provided by the present invention is described in detail, including:

[0053] Step S1, deploying a gas thermal desorption device in the soil area to be repaired;

[0054] In step S2 , the electric control box 1 is enabled through the intelligent control system PLC 15 , the natural gas electric regulating valve 7 is opened to introduce gas, and the primary air manual valve 8 is opened to introduce air, thereby igniting the natural gas introduced into the combustion head 2 .

[0055] Furthermore, by detecting the fire viewing hole, the natural gas electric regulating valve 7 and the secondary air electric regulating valve 9 are controlled by the intelligent control system PLC15 to adjust the appropriate air-fuel ratio A / F.

[0056] Step S3, monitoring the temperature through the thermocouples in the heating well 4 and the temperature monitoring well 5.

[0057] In step S4 , the inlet and outlet temperatures of the underground smoke pipeline are monitored respectively by the first thermometer 15 and the second thermometer 17 , so that the frequency converter 19 is controlled by the intelligent control system PLC 15 to adjust the exhaust flow of the high-temperature fan 18 .

[0058] In summary, the present invention provides a gas thermal desorption device. Through improved design of the burner head and flue gas piping, the intelligent PLC control system controls the natural gas electric regulating valve and the secondary air electric regulating valve to adjust the air-fuel ratio (A / F), achieving maximum natural gas combustion efficiency, complete combustion, and maximum heat output. Furthermore, the present invention incorporates an underground flue gas piping system to utilize waste heat to heat the surface soil, which is difficult to heat. This utilizes the waste heat from the high-temperature flue gas and addresses the drawback of in-situ thermal desorption technology, which often prevents the surface soil from reaching the required temperature. Furthermore, the present invention provides a covering sealing layer above the soil to be treated to reduce heat dissipation from the surface soil.

[0059] It will be apparent to those skilled in the art that the present invention may be modified and varied in various ways. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A fuel gas thermal desorption device, characterized in that: The device comprises: An intelligent control system PLC (15) is used to control an electric control box (1); the electric control box (1) is used to control the combustion process and provide a heat source and a gas source for the combustion head (2); A combustion head (2) is used to provide a space for natural gas combustion; a gas inlet pipe, a primary air inlet pipe, and a secondary air inlet pipe are connected above the combustion head (2); a fire viewing hole is provided on the combustion head (2); the combustion head (2) is connected to a high-temperature fan (18) via a flue gas pipeline (6); wherein the flue gas pipeline (6) includes an above-ground flue gas pipeline portion and an underground flue gas pipeline portion, and the underground flue gas pipeline portion is used to utilize waste heat to heat surface soil that is difficult to heat up; a covering sealing layer (3), the covering sealing layer (3) covering the top of the soil to be treated; and, A heating well (4), said heating well (4) being connected to the burner head (2).

2. The fuel gas thermal desorption device according to claim 1, characterized in that: The electric control box (1) comprises an igniter, a flame controller, a quick shut-off valve, and a linear regulating valve; The igniter is used to ignite the natural gas introduced into the combustion head (2); The flame controller is used to monitor the flame state; The quick shut-off valve is used to quickly cut off the gas source after detecting automatic ignition failure or when the flame needs to be shut off; The linear regulating valve is used to adjust the flame size.

3. The fuel gas thermal desorption device according to claim 1, characterized in that: The gas inlet pipeline is provided with a natural gas inlet flow meter (10) and a natural gas electric regulating valve (7); The primary air inlet pipe is provided with a primary air inlet flow meter (11) and a primary air manual valve (8); The secondary air inlet pipe is provided with a secondary air intake flow meter (12) and a secondary air electric regulating valve (9).

4. The fuel gas thermal desorption device according to claim 3, characterized in that: The natural gas electric regulating valve (7) and the secondary air electric regulating valve (9) are controlled by an intelligent control system PLC (15) to adjust the air-fuel ratio A / F.

5. The fuel gas thermal desorption device according to claim 1, characterized in that: The inlet end of the flue gas pipeline (6) is provided with a first pressure transmitter (13) and a first thermometer (14); The outlet end of the flue gas pipeline (6) is provided with a second pressure transmitter (16) and a second thermometer (17).

6. The fuel gas thermal desorption device according to claim 1, characterized in that: The heating well (4) comprises an inner tube and an outer tube, wherein the inner tube is a hollow pipe, and the high-temperature flue gas generated by the combustion head (2) enters the outer tube from the bottom of the inner tube, thereby heating the surrounding soil and groundwater.

7. The fuel gas thermal desorption device according to claim 1, characterized in that: A plurality of temperature monitoring wells (5) are arranged around the heating well (4), and the heating well (4) and the temperature monitoring well (5) have the same depth.

8. The fuel gas thermal desorption device according to claim 7, characterized in that: A thermocouple is installed at every unit distance in the heating well (4) and the temperature monitoring well (5).

9. The fuel gas thermal desorption device according to claim 1, characterized in that: The high-temperature fan (18) is used to extract high-temperature flue gas in the heating well (4), and the high-temperature fan (18) is coupled to the frequency converter (19); The inlet and outlet temperatures of the underground smoke pipeline are monitored respectively by a first thermometer (14) and a second thermometer (17), thereby controlling a frequency converter (19) via an intelligent control system PLC (15) to adjust the exhaust flow of a high-temperature fan (18).

10. The fuel gas thermal desorption device according to claim 1, characterized in that: The intelligent control system PLC (15) is also coupled to a human-computer interaction screen, and the human-computer interaction screen is used to display data collected by the natural gas intake flow meter (10), the primary air intake flow meter (11), the secondary air intake flow meter (12), the first pressure transmitter (13), the first thermometer (14), the second pressure transmitter (16), the second thermometer (17), and the thermocouples in the heating well (4) and the temperature monitoring well (5).

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