A heat storage pulse heating device for soil thermal desorption remediation

Abstract

The present invention provides a heat storage pulse heating device for soil thermal desorption and repair, comprising a first heat storage burner and a second heat storage burner, the first heat storage burner and the second heat storage burner both comprising a heat storage burner, the first heat storage burner and the second heat storage burner are alternately in a combustion state and a heat storage state, the heating tube of the first heat storage burner and the heating tube of the second heat storage burner are both arranged in a heating well in the soil along a vertical direction; or the heating tube of the first heat storage burner and the second heat storage burner are arranged in a horizontal heating well in the soil along a horizontal direction. The present invention avoids the uneven heating along the heating well direction of the traditional heater by heating from top to bottom or from both ends, so that the temperature of the entire heating tube and the heating well is uniform, the soil desorption effect is improved, and the service life of the equipment can be extended. The two heat storage burners are in a combustion state in turn, and the heat of the high-temperature flue gas is absorbed by the heat storage body, which greatly reduces heat loss.

Description

Technical Field

[0001] The invention discloses a heat storage pulse heating device used for soil thermal desorption restoration, belonging to the technical field of soil restoration. Background Art

[0002] In-situ thermal desorption technology uses vertical or horizontal in-situ heating and vacuum extraction to heat the pollutants in the contaminated soil to be repaired, volatilize them into the soil gas phase or decompose them in situ, and then extract them to the ground for separation and treatment. This technology is an in-situ remediation technology that has little disturbance to the ground environment and is suitable for various types of contaminated sites such as gas stations, petrochemical enterprises and chemical enterprises. In-situ thermal desorption can heat the soil to the volatilization point of the pollutants, and then extract the gas containing the pollutants from the soil for separation and remediation. Compared with traditional soil remediation technology, in-situ thermal desorption technology has the advantages of high remediation efficiency, large effective area and suitability for high-concentration contaminated soil. Therefore, the key to in-situ thermal desorption technology is that the heating temperature must reach the temperature at which the pollutants volatilize. By heating the polluted area to increase the temperature, the physical and chemical properties of pollutants are changed (vapor pressure and solubility increase, viscosity, surface tension, Henry coefficient and soil-water partition coefficient decrease), the concentration of pollutants in the gas or liquid phase is increased, and then combined with steam extraction or multiphase extraction, the removal and recovery of volatile organic compounds, semi-volatile organic compounds, petroleum hydrocarbons and other pollutants in the soil can be achieved.

[0003] In-situ gas thermal desorption is a method of in-situ thermal desorption. The burner is the heat source, and the fuel is natural gas (LNG) or diesel. The soil temperature is increased by heat conduction, and then the organic pollutants are desorbed to further treat wastewater and exhaust gas. In-situ gas thermal desorption has higher combustion efficiency and faster heating than in-situ electric heating thermal desorption, but the heat loss is serious, resulting in energy waste.

[0004] To repair semi-volatile organic compounds (SVOC) in soil, it is usually necessary to heat the soil to 300-500°C. Traditionally, heat energy is provided by a gas heating device inserted into the soil. The gas heating device pipe is buried in the soil to heat the soil. The operating temperature range of the heating device is 500-800°C, and the typical operating temperature is 600-700°C. The heating well pipe is made of high-temperature resistant carbon steel. The heating method is ignition by the ground wellhead igniter. The combustion head is buried in the designed designated position. The flame and hot flue gas enter the bottom of the well from the heating pipe, and then rise in the opposite direction between the heating well and the heating pipe to the wellhead and be discharged by the induced draft fan. The flame temperature of the heating inner tube is 800-1200℃, while the temperature at the smoke exhaust port of the outer tube drops to 200-400℃, resulting in a high temperature at the bottom of the outer tube (bottom of the well) that actually heats the soil, which gradually decreases upwards and is lowest at the top (wellhead). Therefore, the heat energy of the outer tube heating the soil is unevenly distributed and the heating efficiency is low (the longer the heating tube, the more obvious the problem). At the same time, the high-temperature flue gas emission leads to a large amount of heat energy loss (up to 40-70%).

[0005] Chinese patent CN104759464A discloses a contaminated soil thermal desorption remediation system, which includes a feeding system, a thermal desorption main system, a coal supply and combustion system, a flue gas dust removal system and a power distribution cabinet, wherein the feeding system is composed of a hammer crusher connected to the contaminated soil inlet, a primary belt conveyor connected to the discharge end of the hammer crusher, and a dryer connected to the discharge end of the primary belt conveyor, and the thermal desorption main system is mainly composed of a rotating drum high-temperature heating system and a chain plate conveyor arranged at the tail discharge port of the high-temperature heating system. The head feed port of the high-temperature heating system is connected to the discharge port of the dryer through a secondary belt conveyor. It requires matching feeding, crushing, and unloading equipment, which has high equipment cost and high energy consumption, and is difficult to apply to in-situ remediation.

[0006] Chinese patent CN108114970A discloses a contaminated soil in-situ thermal desorption remediation system and method, the system includes a number of in-situ heating electrodes, a number of injection wells, a number of extraction wells, a number of groundwater monitoring wells, electrode power control and regulation facilities, in-situ temperature and pressure monitoring facilities, sewage treatment facilities and waste gas treatment facilities; the in-situ heating electrodes are arranged in a regular triangle or regular hexagon. It can be applied to in-situ remediation and has the characteristics of uniform heating, but the heating method of the heating electrode is high in energy consumption and cost, and has no guiding significance for the improvement of combustion heating. Summary of the invention

[0007] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a heat storage pulse heating device for soil thermal desorption remediation, so as to at least solve the technical problems of uneven temperature of the heating outer tube and large heat energy loss proposed in the above background technology.

[0008] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a heat storage pulse heating device applied to soil thermal desorption repair, comprising a first heat storage burner and a second heat storage burner, the first heat storage burner and the second heat storage burner are arranged in a heating well in the soil, the first heat storage burner and the second heat storage burner both include a heat storage burner, the fuel nozzle of the heat storage burner is connected to the fuel supply pipe, the ignition nozzle of the heat storage burner is connected to the ignition device, the combustion air inlet / smoke outlet of the heat storage burner of the first heat storage burner is connected to the first end of the first three-way reversing valve through a pipeline, the combustion air inlet / smoke outlet of the heat storage burner of the second heat storage burner is connected to the first end of the second three-way reversing valve through a pipeline, the second end of the first three-way reversing valve and the second end of the second three-way reversing valve are both connected to the exhaust port of the blower through a pipeline, and the third end of the first three-way reversing valve and the third end of the second three-way reversing valve are both connected to the air inlet of the induced draft fan through a pipeline.

[0009] The heating tube of the first regenerative burner and the second regenerative burner also include a heating tube, which is connected to the flame-spraying port of the regenerative burner. The heating tubes are arranged in the heating well in the soil along the vertical direction. The first regenerative burner and the second regenerative burner have a spacing in the horizontal direction, and the outlet of the heating tube of the first regenerative burner and the outlet of the heating tube of the second regenerative burner have a spacing in the vertical direction. The heating tube of the first regenerative burner and the heating tube of the second regenerative burner have an appropriate spacing in the horizontal direction so that each heating tube is not located on the same axis, so that one regenerative burner can smoothly enter another regenerative burner. The heating tube of the first regenerative burner can be set according to the heating depth, and the outlet of the heating tube of the second regenerative burner and the outlet of the heating tube of the first regenerative burner have an appropriate spacing in the vertical direction. The two heating tubes can be installed at a certain inclination so that they are used to heat soil at different vertical heights respectively, and are heated at two different vertical heights. This can maintain the uniform temperature of the entire heating tube and the heating well wall. This setting structure is particularly suitable for the vertical well pipe mode.

[0010] Or the first regenerative burner and the second regenerative burner are both arranged in the horizontal direction in the horizontal heating well in the soil, and the regenerative burner of the first regenerative burner and the regenerative burner of the second regenerative burner are located at the same horizontal height and arranged opposite to each other. The temperature of the entire horizontal heating well wall can be maintained uniform through the alternating heating of the first regenerative burner and the second regenerative burner. This arrangement structure is particularly suitable for the ex situ stack mode or the horizontal well heating mode.

[0011] The first heat storage burner and the second heat storage burner are alternately in a combustion state and a heat storage state. Specifically: when the first heat storage burner is in a combustion state and the second heat storage burner is in a heat storage state, the combustion air inlet / smoke outlet of the first heat storage burner is connected to the blower, and the combustion air inlet / smoke outlet of the first heat storage burner is cut off from the induced draft fan by controlling the first three-way reversing valve; at the same time, the combustion air inlet / smoke outlet of the first heat storage burner is connected to the induced draft fan, and the combustion air inlet / smoke outlet of the second heat storage burner is cut off from the blower by controlling the second three-way reversing valve. Fuel is input into the fuel nozzle of the first regenerative burner and ignited by the ignition device, so that the first regenerative burner is ignited and operated, and a large amount of high-temperature flue gas is ejected from the flame nozzle of the regenerative burner of the first regenerative burner. The high-temperature flue gas discharged from the heating tube on the rear side of the regenerative burner of the first regenerative burner flows in the soil, and enters the regenerative burner of the second regenerative burner, and is finally discharged from the combustion air inlet / flush outlet of the second regenerative burner and emptied through the induced draft fan. The heat of the exhaust smoke of the first regenerative burner is absorbed by the regenerative body in the regenerative burner of the second regenerative burner. When the heat absorption of the regenerative body of the second regenerative burner is saturated, the first regenerative burner is extinguished, and the first regenerative burner is switched to a heat storage state and the second regenerative burner is in a combustion state.

[0012] When the second regenerative burner is in a combustion state and the first regenerative burner is in a heat storage state, the first three-way reversing valve is controlled to cut off the combustion air inlet / smoke outlet of the first regenerative burner from the blower and connect the combustion air inlet / smoke outlet of the first regenerative burner to the induced draft fan; at the same time, the second three-way reversing valve is controlled to cut off the combustion air inlet / smoke outlet of the first regenerative burner from the induced draft fan and connect the combustion air inlet / smoke outlet of the second regenerative burner to the blower. Fuel is input into the fuel nozzle of the second regenerative burner and ignited by the ignition device, so that the second regenerative burner is ignited and operated, and a large amount of high-temperature flue gas is ejected from the flame nozzle of the regenerative burner of the second regenerative burner. The high-temperature flue gas discharged from the heating tube on the rear side of the regenerative burner of the second regenerative burner flows in the soil, enters the regenerative burner of the first regenerative burner, and is finally discharged from the combustion air inlet / flush outlet of the first regenerative burner and emptied through the induced draft fan. The heat of the exhaust gas of the second regenerative burner is absorbed by the regenerative body in the regenerative burner of the first regenerative burner. When the heat absorption of the regenerative body of the first regenerative burner is saturated, the second regenerative burner is extinguished, and the second regenerative burner is switched to a heat storage state and the first regenerative burner is in a combustion state.

[0013] The device can be applied to in-situ (generally vertical well pipe) and ex-situ pile (generally horizontal pipe) repair modes. The in-situ repair mode is to establish a heating well through vertical or directional drilling and install a heater for heating. The ex-situ mode is to build a pile through soil excavation and transportation, and lay horizontal heating pipes for heating according to design requirements. The two regenerative burners are in a burning state in turn. The high-temperature flue gas discharged from one regenerative burner is absorbed by the regenerative body in the other regenerative burner instead of being discharged directly, which greatly reduces heat loss. In addition, the heating pipe is evenly heated as a whole, which can extend the service life of the equipment.

[0014] Optionally, the fuel transported by the fuel supply pipe is fuel oil or natural gas.

[0015] Preferably, a pressure transmitter, a pneumatic flow regulating valve and an orifice flowmeter are sequentially arranged on the pipeline connected to the exhaust port of the blower, and the outlet of the orifice flowmeter is respectively connected to the second end of the first three-way reversing valve and the second end of the second three-way reversing valve through pipelines.

[0016] Preferably, a pneumatic regulating valve is provided on the pipeline connected to the air inlet of the induced draft fan, and the air inlet of the pneumatic regulating valve is connected to the third end of the first three-way reversing valve and the third end of the second three-way reversing valve through pipelines.

[0017] Preferably, the exhaust port of the induced draft fan is connected to the chimney through a pipeline, and a ball valve is provided on the pipeline connecting the induced draft fan and the chimney.

[0018] Preferably, a gas control valve and a ball valve are sequentially provided on a fuel supply pipe connected to the fuel nozzle of the regenerative burner of the first regenerative burner and a fuel supply pipe connected to the fuel nozzle of the regenerative burner of the second regenerative burner.

[0019] Preferably, the ignition device includes an automatic igniter and a long-fire ignition gun, the automatic igniter is connected to the long-fire ignition gun, the long-fire ignition gun is connected to the long-fire natural gas supply pipe, and the long-fire natural gas supply pipe is provided with a ball valve and an electric valve, the automatic igniter is connected to the exhaust port of the blower through a pipeline, and a ball valve is provided on the pipeline connecting the automatic igniter and the blower, and the long-fire ignition gun is connected to the ignition nozzle of the regenerative burner. The long-fire ignition gun is convenient for starting ignition and reducing the failure rate.

[0020] Further preferably, the ignition device further comprises a flame detector, and the flame detector is installed between the long-fire ignition gun and the regenerative burner.

[0021] Preferably, the regenerative burner comprises a regenerative chamber and a combustion chamber which are arranged in sequence from top to bottom, a combustion chamber is arranged inside the combustion chamber, a flame nozzle connected to the combustion chamber is arranged at the bottom of the combustion chamber, a fuel nozzle and an ignition nozzle connected to the combustion chamber are arranged on the side wall of the combustion chamber, a heat storage chamber is arranged inside the regenerative chamber, a heat storage body is arranged in the heat storage chamber, a combustion-supporting air inlet / smoke outlet is arranged on the top of the regenerative burner, and the combustion-supporting air inlet / smoke outlet is connected to the combustion chamber through the heat storage chamber.

[0022] Preferably, a temperature measuring device for measuring the soil temperature is buried in the soil between the two heating tubes. The temperature measuring device may be a temperature sensor or a thermocouple.

[0023] The present invention also provides a soil thermal desorption repair method, comprising the following steps:

[0024] S1, setting a heating well in the soil to be remediated;

[0025] S2, at least two regenerative burners are arranged in the heating well, and the regenerative burners are used to burn fuel to generate hot flue gas and store heat in the flue gas;

[0026] S3, when the heating well is a vertical well, the smoke outlets of at least two regenerative burners are arranged to have a spacing in the vertical direction; when the heating well is a horizontal well, the smoke outlets of at least two regenerative burners are arranged to be at the same horizontal position and facing each other;

[0027] S4, making the at least two regenerative burners alternately in a combustion state and a regenerative state, wherein one regenerative burner burns to generate flue gas, and the other regenerative burner absorbs the flue gas to store heat.

[0028] Beneficial effects of the present invention:

[0029] The present invention avoids the uneven heating along the heating well direction of the traditional heater by heating from top to bottom or both ends, and can maintain the uniform temperature of the entire heating tube and the heating well, improve the soil desorption effect, and extend the service life of the equipment. The two regenerative burners are in a combustion state in turn, and the heat of the high-temperature flue gas discharged by one regenerative burner is absorbed by the heat storage body in the other regenerative burner instead of being discharged directly, which greatly reduces heat loss. In addition, the heating tube is evenly heated as a whole, which can extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0031] Figure 1 It is a schematic diagram of the heating tube in the present invention when it is arranged in a vertical direction;

[0032] Figure 2 It is a schematic diagram of the heating tube in the present invention when it is arranged in the horizontal direction;

[0033] Figure 3 for Figure 1 A partial enlarged schematic diagram of the middle I part;

[0034] Figure 4 It is a schematic diagram of the cross-sectional structure of the regenerative burner;

[0035] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along section AA;

[0036] Figure 6 It is a schematic diagram of the side structure of the regenerative burner;

[0037] Figure 7 It is a structural schematic diagram of another embodiment of the present invention when the heating tube is arranged in the vertical direction. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments. The preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0039] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a centered element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centered element at the same time. The terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used herein indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention, and such expressions are only for illustrative purposes and do not represent the only implementation method.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0041] See also Figure 1-Figure 3 The present invention provides a technical solution: a heat storage pulse heating device for soil thermal desorption repair, comprising a first heat storage burner 1 and a second heat storage burner 2, the first heat storage burner 1 and the second heat storage burner 2 having the same structure, the first heat storage burner 1 and the second heat storage burner 2 both comprising a heat storage burner 3, the fuel nozzle of the heat storage burner 3 connected to a fuel supply pipe 5, the ignition nozzle of the heat storage burner 3 connected to an ignition device 6, the first heat storage burner 1 The combustion air inlet / smoke outlet of the regenerative burner 3 is connected to the first end of the first three-way reversing valve 7 through a pipeline, the combustion air inlet / smoke outlet of the regenerative burner 3 of the second regenerative burner 2 is connected to the first end of the second three-way reversing valve 6 through a pipeline, the second end of the first three-way reversing valve 7 and the second end of the second three-way reversing valve 6 are both connected to the exhaust port of the blower 9 through a pipeline, and the third end of the first three-way reversing valve 7 and the third end of the second three-way reversing valve 6 are both connected to the air inlet of the induced draft fan 10 through a pipeline.

[0042] like Figure 1 As shown, in some embodiments of the present invention, the heating tube 4 of the first regenerative burner 1 and the second regenerative burner 2 further include a heating tube 4, which is connected to the flame-spraying port of the regenerative burner, and the heating tube 4 is vertically arranged in the heating well 100 in the soil, and the first regenerative burner 1 and the second regenerative burner 2 are spaced apart in the horizontal direction, and the outlet of the heating tube 4 of the first regenerative burner 1 and the outlet of the heating tube 4 of the second regenerative burner 2 are spaced apart in the vertical direction. The heating tube 4 of the first regenerative burner 1 and the heating tube 4 of the second regenerative burner 2 are appropriately spaced apart in the horizontal direction, so that the heating tubes 4 are not located on the same axis, so that one regenerative burner can smoothly enter another regenerative burner. The heating tube 4 of the first regenerative burner 1 can be set according to the heating depth, and the outlet of the heating tube 4 of the second regenerative burner 2 and the outlet of the heating tube of the first regenerative burner are both appropriately spaced in the vertical direction, and can be installed at a certain inclination, so that the two heating tubes 4 are used to heat soil at different vertical heights respectively, and heat at two different vertical heights, which can maintain the uniform temperature of the entire heating well pipe. This setting structure is particularly suitable for the vertical well pipe mode.

[0043] like Figure 1 In the illustrated embodiment, the length of the heating tube 4 of the second regenerative burner 2 is shorter than that of the heating tube 4 of the first regenerative burner 1 , so that the outlet of the heating tube 4 of the second regenerative burner 2 is above the outlet of the heating tube 4 of the first regenerative burner 1 .

[0044] As a preferred embodiment, according to Figure 7As shown, the second thermal storage burner 2 is installed in a heating well 100 obliquely connected to the heating well 100 of the first thermal storage burner 1, so that the outlet of the heating tube 4 of the second thermal storage burner 2 is above the outlet of the heating tube 4 of the first thermal storage burner 1. The first thermal storage burner 1 and the second thermal storage burner 2 have an appropriate spacing in the horizontal direction so that each heated flue gas is not located on the same axis, so that the flue gas can smoothly enter another thermal storage burner from a certain thermal storage burner. The heating tube 4 of the first thermal storage burner 1 and the heating tube 4 of the second thermal storage burner 2 have an appropriate spacing in the vertical direction, so that the two heating tubes 4 are used to heat the soil at different vertical heights respectively, and the heating is performed at two different vertical heights. While meeting the heating of the soil at a large depth, the heating tube 4 of the second thermal storage heater does not need to be set too long, especially Figure 7 In the embodiment shown, the hot flue gas is heated from top to bottom in a spiral shape, which can maintain a uniform temperature of the entire heating pipe and the heating well wall. This arrangement is particularly suitable for the vertical well pipe mode.

[0045] or Figure 2 As shown, in some other embodiments of the present invention, the heat storage burner does not need to be provided with a heating tube 4, and the first heat storage burner 1 and the second heat storage burner 2 are both arranged in the horizontal direction in the horizontal heating well 200 in the soil, and the heat storage burner of the first heat storage burner 1 and the heat storage burner of the second heat storage burner 2 are located at the same horizontal height and are arranged opposite to each other. By alternating heating by the first heat storage burner 1 and the second heat storage burner 2, the temperature of the entire horizontal heating well wall can be maintained uniform. The two heat storage burners heat at different horizontal parts respectively, so that for a larger area of ​​the stack that requires a longer length of horizontal heating well, the temperature of the entire horizontal heating well wall can be maintained uniform. This arrangement structure is particularly suitable for the ectopic stack mode.

[0046] The first regenerative burner 1 and the second regenerative burner 2 of the present invention are alternately in a combustion state and a heat storage state, and can be applied to in-situ (generally vertical well pipe) and ex-situ pile (generally horizontal pipe) repair modes. The in-situ repair mode is to establish a heating well through vertical or directional drilling, and to heat it by installing a heater. The ex-situ mode is to build a pile through soil excavation and transportation, and to lay a horizontal heating well according to the design requirements for heating. The two regenerative burners are in a combustion state in turn, and the high-temperature flue gas discharged from one regenerative burner is absorbed by the heat storage body in the other regenerative burner instead of being discharged directly, which greatly reduces heat loss. In addition, the heating pipe is evenly heated as a whole, which can extend the service life of the equipment. At the same time, both modes can maintain the temperature of the wall of the heating well, so that the heat energy in the soil is evenly distributed, which effectively avoids the temperature in some areas being unable to meet the desorption needs and improves the desorption effect of the soil along the heating well.

[0047] Optionally, the fuel transported by the fuel supply pipe 5 is fuel oil or natural gas.

[0048] Preferably, a pressure transmitter 11, a pneumatic flow regulating valve 12 and an orifice flowmeter 13 are sequentially arranged on the pipeline connected to the exhaust port of the blower 9, and the outlet of the orifice flowmeter 13 is respectively connected to the second end of the first three-way reversing valve 7 and the second end of the second three-way reversing valve 6 through pipelines.

[0049] Preferably, a pneumatic regulating valve 14 is provided on the pipeline connected to the air inlet of the induced draft fan 10, and the air inlet of the pneumatic regulating valve 14 is connected to the third end of the first three-way reversing valve 7 and the third end of the second three-way reversing valve 6 through pipelines.

[0050] Preferably, the exhaust port of the induced draft fan 10 is connected to the chimney 15 via a pipeline, and a ball valve is provided on the pipeline connecting the induced draft fan 10 and the chimney 15.

[0051] Preferably, a gas control valve 17 and a ball valve 18 are sequentially provided on the fuel supply pipe 5 connected to the fuel nozzle of the regenerative burner 3 of the first regenerative burner 1 and the fuel supply pipe 5 connected to the fuel nozzle of the regenerative burner 3 of the second regenerative burner 2.

[0052] Preferably, the ignition device 6 includes an automatic igniter 19 and a long-fire ignition gun 20, the automatic igniter 19 is connected to the long-fire ignition gun 20, the long-fire ignition gun 20 is connected to the long-fire natural gas supply pipe 21, and the long-fire natural gas supply pipe 21 is provided with a ball valve 22 and an electric valve 23, the automatic igniter 19 is connected to the exhaust port of the blower 9 through a pipeline, and a ball valve 24 is provided on the pipeline connecting the automatic igniter 19 and the blower 9, and the long-fire ignition gun 20 is connected to the ignition nozzle of the regenerative burner 3. The long-fire ignition gun is convenient for starting ignition and reducing the failure rate.

[0053] Further preferably, the ignition device 6 further includes a flame detector 25 , and the flame detector 25 is installed between the long-fire ignition gun 20 and the regenerative burner 3 .

[0054] Preferably, Figure 4-Figure 6 As shown, the regenerative burner includes a regenerative chamber 26 and a combustion chamber 27 which are arranged in sequence from top to bottom, a combustion chamber 28 is arranged inside the combustion chamber 27, a flame nozzle 29 connected to the combustion chamber 28 is arranged at the bottom of the combustion chamber 27, a fuel nozzle 30 and an ignition nozzle 31 connected to the combustion chamber 28 are arranged on the side wall of the combustion chamber 27, a regenerative chamber is arranged in the regenerative chamber 26, a regenerative body 32 is arranged in the regenerative chamber, a combustion air inlet / smoke outlet 33 is arranged on the top of the regenerative burner, and the combustion air inlet / smoke outlet 33 is connected to the combustion chamber 28 through the regenerative chamber.

[0055] Preferably, a temperature measuring device 34 for measuring the soil temperature is buried in the soil between the two heating tubes 4. The temperature measuring device 34 may be a temperature sensor or a thermocouple.

[0056] Working principle: The first regenerative burner 1 and the second regenerative burner 2 of the present invention are alternately in a combustion state and a heat storage state. Specifically: when the first regenerative burner 1 is in a combustion state and the second regenerative burner 2 is in a heat storage state, the first three-way reversing valve 7 is controlled to connect the combustion air inlet / smoke outlet of the first regenerative burner 1 with the blower 9, and the combustion air inlet / smoke outlet of the first regenerative burner 1 with the induced draft fan 10; at the same time, the second three-way reversing valve 6 is controlled to connect the combustion air inlet / smoke outlet of the first regenerative burner 1 with the induced draft fan 10, and the combustion air inlet / smoke outlet of the second regenerative burner 2 with the blower 9. Fuel is input into the fuel nozzle of the first regenerative burner 1 and ignited by the ignition device 6, so that the first regenerative burner 1 is ignited and operated, and a large amount of high-temperature flue gas is ejected from the nozzle of the regenerative burner 3 of the first regenerative burner 1. The high-temperature flue gas discharged from the heating tube 4 on the rear side of the regenerative burner 3 of the first regenerative burner 1 flows in the soil and enters the heating tube 4 of the second regenerative burner 2, passes through the heating tube 4 and the regenerative burner 3 of the second regenerative burner 2 in turn, and is finally discharged from the combustion air inlet / flue gas outlet of the second regenerative burner 2 and emptied through the induced draft fan 10. The heat storage body in the regenerative burner 3 of the second regenerative burner 2 absorbs the exhaust heat of the first regenerative burner 1. When the heat storage body of the second regenerative burner 2 absorbs saturated heat, the first regenerative burner 1 is extinguished, and the first regenerative burner 1 is switched to a heat storage state and the second regenerative burner 2 is in a combustion state.

[0057] When the second regenerative burner 2 is in a combustion state and the first regenerative burner 1 is in a heat storage state, the first three-way reversing valve 7 is controlled to cut off the combustion air inlet / smoke outlet of the first regenerative burner 1 from the blower 9 and connect the combustion air inlet / smoke outlet of the first regenerative burner 1 to the induced draft fan 10; at the same time, the second three-way reversing valve 6 is controlled to cut off the combustion air inlet / smoke outlet of the first regenerative burner 1 from the induced draft fan 10 and connect the combustion air inlet / smoke outlet of the second regenerative burner 2 to the blower 9. Fuel is input into the fuel nozzle of the second regenerative burner 2 and ignited by the ignition device 6, so that the second regenerative burner 2 is ignited and operated, and a large amount of high-temperature flue gas is ejected from the nozzle of the regenerative burner 3 of the second regenerative burner 2. The high-temperature flue gas discharged from the heating tube 4 on the rear side of the regenerative burner 3 of the second regenerative burner 2 flows in the soil and enters the heating tube 4 of the first regenerative burner 1, passes through the heating tube 4 and the regenerative burner 3 of the first regenerative burner 1 in turn, and is finally discharged from the combustion air inlet / flush outlet of the first regenerative burner 1 and emptied through the induced draft fan 10. The heat storage body in the regenerative burner 3 of the first regenerative burner 1 absorbs the exhaust heat of the second regenerative burner 2. When the heat storage body of the first regenerative burner 1 absorbs saturated heat, the second regenerative burner 2 is extinguished, and the second regenerative burner 2 is switched to a heat storage state and the first regenerative burner 1 is in a combustion state.

[0058] In this way, the first regenerative burner 1 and the second regenerative burner 2 are controlled to operate alternately in sequence according to the actual temperature.

[0059] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0060] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A heat storage pulse heating device used for soil thermal desorption remediation, characterized in that: It includes a first regenerative burner and a second regenerative burner, wherein the first regenerative burner and the second regenerative burner are arranged in a heating well in the soil, and the first regenerative burner and the second regenerative burner both include a regenerative burner, a fuel nozzle of the regenerative burner is connected to a fuel supply pipe, an ignition nozzle of the regenerative burner is connected to an ignition device, a combustion air inlet / smoke outlet of the regenerative burner of the first regenerative burner is connected to a first end of a first three-way reversing valve through a pipeline, a combustion air inlet / smoke outlet of the regenerative burner of the second regenerative burner is connected to a first end of a second three-way reversing valve through a pipeline, a second end of the first three-way reversing valve and a second end of the second three-way reversing valve are both connected to an exhaust port of a blower through a pipeline, and a third end of the first three-way reversing valve and a third end of the second three-way reversing valve are both connected to an air inlet of an induced draft fan through a pipeline; The heating tube of the first regenerative burner and the second regenerative burner further include a heating tube, which is connected to the flame-spraying port of the regenerative burner. The heating tubes are both arranged in the heating well in the soil along the vertical direction. The first regenerative burner and the second regenerative burner are spaced apart in the horizontal direction. The outlet of the heating tube of the first regenerative burner and the outlet of the heating tube of the second regenerative burner are spaced apart in the vertical direction. The second regenerative burner is installed in a heating well obliquely connected to the heating well of the first regenerative burner; The regenerative burner comprises a regenerative chamber and a combustion chamber which are arranged in sequence from top to bottom, a combustion chamber is arranged inside the combustion chamber, a flame nozzle connected to the combustion chamber is arranged at the bottom of the combustion chamber, a fuel nozzle and an ignition nozzle connected to the combustion chamber are arranged on the side wall of the combustion chamber, a regenerative chamber is arranged inside the regenerative chamber, a regenerative body is arranged inside the regenerative chamber, a combustion-supporting air inlet / smoke outlet is arranged at the top of the regenerative burner, and the combustion-supporting air inlet / smoke outlet are connected to the combustion chamber through the regenerative chamber; The first regenerative burner and the second regenerative burner are alternately in a combustion state and a regenerative state; The first regenerative burner and the second regenerative burner are alternately in a combustion state and a heat storage state, comprising the following steps: When the first regenerative burner is in a combustion state and the second regenerative burner is in a heat storage state, the first three-way reversing valve is controlled to connect the combustion air inlet / smoke outlet of the first regenerative burner to the blower, and the combustion air inlet / smoke outlet of the first regenerative burner to the induced draft fan; at the same time, the second three-way reversing valve is controlled to connect the combustion air inlet / smoke outlet of the first regenerative burner to the induced draft fan, and the combustion air inlet / smoke outlet of the second regenerative burner to the blower; Fuel is input into the fuel nozzle of the first regenerative burner and ignited by the ignition device, so that the first regenerative burner is ignited and operated. A large amount of high-temperature flue gas is ejected from the flame nozzle of the regenerative burner of the first regenerative burner. The high-temperature flue gas discharged from the regenerative burner of the first regenerative burner flows in the heating well and enters the second regenerative burner, passes through the regenerative burner of the second regenerative burner, and is finally discharged from the combustion air inlet / flue gas outlet of the second regenerative burner and emptied through the induced draft fan. The heat of the exhaust gas of the first regenerative burner is absorbed by the regenerative body in the regenerative burner of the second regenerative burner. When the heat absorption of the regenerative body of the second regenerative burner is saturated, the first regenerative burner is extinguished, and the state where the first regenerative burner is in the heat storage state and the second regenerative burner is in the combustion state is switched; When the second regenerative burner is in a combustion state and the first regenerative burner is in a heat storage state, the combustion air inlet / smoke outlet of the first regenerative burner is cut off from the blower and the combustion air inlet / smoke outlet of the first regenerative burner is connected to the induced draft fan by controlling the first three-way reversing valve; at the same time, the combustion air inlet / smoke outlet of the first regenerative burner is cut off from the induced draft fan and the combustion air inlet / smoke outlet of the second regenerative burner is connected to the blower by controlling the second three-way reversing valve; Fuel is input into the fuel nozzle of the second regenerative burner and ignited by the ignition device, so that the second regenerative burner is ignited and operated, and a large amount of high-temperature flue gas is ejected from the flame nozzle of the regenerative burner of the second regenerative burner. The high-temperature flue gas exhausted from the regenerative burner of the second regenerative burner flows in the heating well, enters the regenerative burner of the first regenerative burner, and is finally discharged from the combustion air inlet / flush gas outlet of the first regenerative burner and emptied through the induced draft fan. The heat of the exhaust gas of the second regenerative burner is absorbed by the regenerative body in the regenerative burner of the first regenerative burner. When the heat absorption of the regenerative body of the first regenerative burner is saturated, the second regenerative burner is extinguished, and the second regenerative burner is switched to a heat storage state and the first regenerative burner is in a combustion state.

2. According to claim 1, a heat storage pulse heating device for soil thermal desorption remediation is characterized by: The ignition device includes an automatic igniter and a long-fire ignition gun. The automatic igniter is connected to the long-fire ignition gun. The long-fire ignition gun is connected to the long-fire natural gas supply pipe, and the long-fire natural gas supply pipe is provided with a ball valve and an electric valve. The automatic igniter is connected to the exhaust port of the blower through a pipeline, and a ball valve is provided on the pipeline connecting the automatic igniter and the blower. The long-fire ignition gun is connected to the ignition nozzle of the heat storage burner.

3. A heat storage pulse heating device for soil thermal desorption remediation according to claim 1 or 2, characterized in that: A pressure transmitter, a pneumatic flow regulating valve and an orifice flowmeter are sequentially arranged on the pipeline connected to the exhaust port of the blower. The outlet of the orifice flowmeter is respectively connected to the second end of the first three-way reversing valve and the second end of the second three-way reversing valve through pipelines.

4. A heat storage pulse heating device for soil thermal desorption remediation according to claim 1 or 2, characterized in that: A pneumatic regulating valve is arranged on the pipeline connected to the air inlet of the induced draft fan, and the air inlet of the pneumatic regulating valve is respectively connected to the third end of the first three-way reversing valve and the third end of the second three-way reversing valve through pipelines.

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