CN117564072A - Microwave heating material device and soil remediation system - Google Patents

Abstract

The invention provides a microwave material heating device and a soil remediation system, and relates to the field of environmental protection equipment. The microwave heating material device comprises: the upper end and the lower end of the shaft furnace respectively form a feed inlet and a discharge outlet; the air pipe is sleeved in the shaft furnace, and an annular hearth for guiding the block is formed between the air pipe and the shaft furnace; and the microwave generator inputs microwaves into the annular hearth in a surrounding manner through the microwave introducing window. The structure can make the volatile gas timely and smoothly discharged out of the shaft furnace; the structural design of the inner tube and the outer tube is favorable for controlling the annular width of the annular hearth, and the structure can be easily amplified by increasing the outer diameter of the air tube and the inner diameter of the shaft furnace under the condition of keeping the annular width unchanged, so that the material quantity which can be processed by the device is not limited by the microwave penetration distance.

Description

Microwave heating material device and soil remediation system

Technical Field

The invention relates to the field of environmental protection equipment, in particular to a microwave material heating device and a soil remediation system.

Background

For soil contaminated with organic contaminants, one of the more common means of remediation is microwave remediation. The microwave heating is based on the heating effect of the substance on the absorption of microwave energy, and the microwave energy penetrates through the surface layer in the form of electromagnetic waves and is dispersed in the substance, so that the microwave heating has penetrability which is not possessed by other heating modes; and the microwaves have heating effect on the soil environment, and have a non-thermal effect, namely, under the action of the microwaves, the reaction system temperature is far lower than the conventional heating temperature, and the pollution removal efficiency is the same as that of the conventional heating. At present, the microwave heating mode is suitable for removing various soil organic pollutants such as volatile organic compounds, semi-volatile organic compounds, petroleum hydrocarbon, pesticides and the like.

The microwave repairing technology has the advantages of high efficiency and energy conservation, but in the process of heating and decomposing, the gas volatilized by the substances is difficult to discharge in time, particularly when the pollutant with partial water content is heated by microwaves, the water is changed into water vapor after absorbing energy, the temperature rising rate of the pollutant in a high-temperature section is reduced due to the existence of the water vapor, and the proper pollutant decomposing temperature is difficult to reach, so that the repairing efficiency is reduced, and the energy consumption of microwaves is wasted. In addition, the transmission and radiation range of microwaves in pollutants is limited, so that only the pollutants in a quantitative range can be repaired when microwaves are repaired, and if the amount of the pollutants to be repaired is too large, the pollutants in the range outside the microwave radiation range can be prevented from being desorbed and cracked.

Disclosure of Invention

For overcoming the not enough among the prior art, this application provides a microwave heating material device, includes:

the upper end and the lower end of the shaft furnace respectively form a feed inlet and a discharge outlet, so that the materials can fall from high to low;

the air pipe is sleeved in the shaft furnace, an annular hearth for guiding in the materials is formed between the air pipe and the shaft furnace, one end of the air pipe extends out of the shaft furnace and forms an air outlet, and a plurality of air inlets are distributed on the pipe wall of the air pipe in the shaft furnace;

a microwave introduction window disposed around the shaft furnace;

and the microwave generator is used for inputting microwaves into the annular hearth in a surrounding manner through the microwave introducing window, and the annular width of the annular hearth is smaller than the maximum penetration range of the microwaves in the materials.

In one possible embodiment, the gas pipe and the shaft furnace are both round pipes and are coaxially arranged so that the annular furnace forms an annular furnace.

In one possible implementation mode, the inner wall of the shaft furnace is connected with the outer wall of the air pipe through a supporting piece, the supporting piece is hollow and communicated with the inner part of the air pipe, and a plurality of air inlets are distributed on the wall of the supporting piece.

In one possible implementation mode, the microwave generator further comprises a temperature detector and a controller which are electrically connected, wherein one end of a probe of the temperature detector extends into the support, and the microwave generator is controlled by the controller.

In one possible implementation mode, the microwave oven further comprises an air pressure sensor and a controller which are electrically connected, wherein one end of a probe of the air pressure sensor extends into the support, and the microwave generator is controlled by the controller.

In one possible embodiment, a plurality of microwave generators are arranged, and a plurality of microwave generators are arranged at intervals along the height direction of the shaft furnace; the relative height of the discharge hole is higher than that of any air inlet hole, so that the hot air in the air pipe moves from bottom to top.

In one possible embodiment, a discharging mechanism capable of controlling the discharging speed is further arranged near the discharging hole, and a feeding end of the discharging mechanism is connected with the discharging hole.

In a possible embodiment, the device further comprises a negative pressure device, which is arranged close to the air outlet for forming a negative pressure area at the air outlet.

The application also provides a soil remediation system, which comprises the microwave material heating device.

In one possible embodiment, the soil remediation system further comprises an ignition device disposed proximate to the air outlet for burning exhaust exiting the air outlet.

Compared with the prior art, the beneficial effect of this application: the utility model provides a microwave heating material device can be used to carry out thermal decomposition to the lump material that contains volatile matter, establishes at the inside trachea of shaft furnace including shaft furnace and cover, is formed with annular furnace between trachea and the shaft furnace, and trachea one end stretches out the shaft furnace and forms the gas outlet, and the trachea is in the pipe wall in the shaft furnace and distributes and have a plurality of inlet ports, and the periphery of shaft furnace still is equipped with the microwave generator to annular furnace input microwave. According to the scheme, volatile substances in the blocks are converted into volatile gases under the action of microwave heating, the volatile gases flow from gaps among the blocks, enter the air pipe from the air inlet holes and are discharged from the air outlet, and therefore the structure can enable the volatile gases to be discharged out of the shaft furnace timely and smoothly; the structural design of the inner tube and the outer tube is favorable for controlling the annular width of the annular hearth, and the structure can be easily amplified by increasing the outer diameter of the air tube and the inner diameter of the shaft furnace under the condition of keeping the annular width unchanged, so that the amount of the blocks which can be processed by the device is not limited by the microwave penetration distance.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic longitudinal structure of a microwave heating device;

FIG. 2 shows a cross-sectional view of a microwave heating material device in an aerial view;

FIG. 3 is a table showing boiling points of a part of benzene and phenol compounds.

Description of main reference numerals:

100-shaft furnace; 110-a feed inlet; 120-a discharge hole; 130-a microwave introduction window; 140-shrink section; 200-trachea; 210-an air outlet; 220-an air inlet hole; 230-bending section; 300-a microwave generator; 400-annular hearth; 500-sealing the feed hopper; 600-temperature detector; 700-a discharging mechanism; 800-support.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Example 1

Referring to fig. 1 and 2, the present embodiment provides a schematic structure of a microwave heating device for thermally decomposing a block containing volatile substances, wherein the volatile substances may be phenolic compounds or benzene compounds; gaps are formed between the blocks and are used to flow the volatile gases generated by thermal desorption. In some embodiments, the initial form of the blocks may be in powder or block form (e.g., cold-agglomerated blocks), and the particle size of the blocks may preferably range from 2mm to 50mm when pressure is applied and/or binder is added or the blocks are formed, e.g., using cold-agglomerated blocks.

The microwave heating device comprises a shaft furnace 100, an air pipe 200 and a microwave generator 300, wherein the shaft furnace 100 is used for introducing a lump, the air pipe 200 is used for discharging gas generated by pyrolysis of volatile substances out of the shaft furnace 100, the microwave generator 300 is used as a heat source for heating the lump to thermally desorb, and molecular bonds of some volatile organic substances can be broken due to the action of microwaves, and macromolecular organic substances are converted into micromolecular organic substances, so that the generated gas can be combusted later.

The upper and lower ends of the shaft furnace 100 respectively form a feed inlet 110 and a discharge outlet 120; the feed inlet 110 is one end of the lump material entering the shaft furnace 100 and is disposed at a relatively high point of the shaft furnace 100 in the gravity direction; the discharge port 120 is one end of the heat-treated lump material, which is led out from the shaft furnace 100, and is disposed at a relatively low point position of the shaft furnace 100 in the gravity direction; the cake can fall under gravity from the inlet 110 toward the outlet 120. The shape of the shaft furnace 100 and the direction in which it extends are not particularly limited, but in some preferred embodiments the shaft furnace 100 is a straight tube and extends in a vertical direction so that the nuggets can fall unhindered.

Specifically, the shaft furnace 100 is made of refractory metal material so that it can enclose and reflect microwave energy; the cross-sectional shape of the shaft furnace 100 is not particularly limited, and may be a square tube, a round tube, or other tubular members having polygonal cross-sections, and the length of the shaft furnace 100 is designed and determined as needed.

The air pipe 200 is sleeved in the shaft furnace 100, an annular hearth 400 for introducing the lump materials is formed between the air pipe 200 and the shaft furnace 100, one end of the air pipe 200 extends out of the shaft furnace 100 and forms an air outlet 210, and a plurality of air inlets 220 are distributed on the pipe wall of the air pipe 200 in the shaft furnace 100. Volatile gases generated by thermal desorption of the cake enter the air tube 200 from the air inlet 220 and are exhausted from one end of the air outlet 210. The size of the air inlet holes 220 is adapted to the size of the block such that the radius is defined such that the block cannot enter the width of the air tube 200. The shape and extending direction of the gas pipe 200 are not limited as long as it constitutes a hollow member so that gas can flow inside the gas pipe 200. In fig. 1, one end of the air pipe 200 extends through the upper end of the shaft furnace 100 to form the air outlet 210, while in other possible embodiments, one end of the air outlet 210 of the air pipe 200 may extend from the outlet 120 of the shaft furnace 100 or extend through the wall of the shaft furnace 100, so long as one end of the air outlet 210 is located outside the shaft furnace 100.

Referring to fig. 2, a microwave introduction window 130 is provided around the shaft furnace 100; specifically, the microwave introduction windows 130 may be made of quartz glass or alumina ceramic, the number of the microwave introduction windows 130 may be plural (e.g., five or ten), and the plurality of microwave introduction windows 130 are disposed at evenly distributed positions along the circumference of the tube wall of the shaft furnace 100. The number of microwave introduction windows 130 may also be one, for example, the microwave introduction windows 130 are designed in a ring shape to surround the shaft furnace.

The microwave generators 300 are used to input microwaves circumferentially into the annular firebox 400 through the microwave introduction windows 130, the annular firebox 400 having an annular width smaller than the maximum penetration range of the microwaves in the nuggets, and the number of the microwave generators 300 is generally the same as the number of the microwave introduction windows 130. The input of microwaves into the annular hearth 400 in a surrounding manner means that microwaves are input from the outer periphery of the shaft furnace 100 toward the central axis of the shaft furnace 100, and if the annular width is larger than the penetration range of microwaves, it is difficult for the blocks located inside the annular hearth 400 (i.e., on the side close to the outer wall of the gas pipe 200) to absorb the microwave energy and raise the temperature. In some embodiments, the penetration range of microwaves is less than 200mm, and thus the ring width is also less than 200mm.

It will be appreciated that due to the limited penetration distance of the microwaves, the microwaves heat only volatile substances within their penetration range, which may result in that parts of the mass outside the range of microwave radiation are not desorbed and cracked if the amount of mass to be desorbed is too large.

In this application, the structural design of the inner and outer tubes is advantageous for controlling the annular width of the annular furnace 400, and the structure can be easily enlarged by increasing the outer diameter of the air pipe 200 and the inner diameter of the shaft furnace 100 while maintaining the annular width unchanged, so that the amount of the lump materials that can be processed by the device is not limited by the microwave penetration distance.

For ease of understanding, the following is illustrative but not representative of the actual situation. Assuming that the maximum penetration distance of microwaves in a certain type of lump is 200mm, if the gas pipe 200 is not provided to form the annular hearth 400, the radius of the shaft furnace 100 cannot be larger than 200mm all the time, otherwise the lump at the center of the shaft furnace 100 cannot be heated by microwave radiation, and thus the amount of lump in the shaft furnace 100 which can be radiated by microwaves is always limited.

In contrast, when the structure of the present application is adopted, when the inner diameter of the shaft furnace 100 is 300mm, the outer diameter of the air pipe 200 is 100mm, the annular width of the annular chamber 400 is 200mm, and microwaves just penetrate the blocks in the annular chamber 400, the cross-sectional area of the annular chamber 400 is about 628cm ² The method comprises the steps of carrying out a first treatment on the surface of the When the inner diameter of the shaft furnace 100 is 400mm and the outer diameter of the air pipe 200 is 200mm, the annular width of the annular hearth 400 is still 200mm, and microwaves can still penetrate through the blocks, but the cross-sectional area of the annular hearth 400 is about 942cm at this time ² The amount of the block processed by the device is further improved; the design structure of the inner tube and the outer tube can ensure that the amount of the blocks which can be processed by the device is not limited by the microwave penetration distance, and the processing amount can be increased limitlessly only by amplifying the structure.

Referring to fig. 1 for the structure of other parts of the device, a shaft furnace 100 is vertically arranged, a plurality of feed inlets 110 are optionally arranged at the upper end of the shaft furnace 100, and a sealing feed hopper 500 is butt-jointed with any feed inlet 110; in some preferred embodiments, the plurality of feed openings 110 are symmetrically or in an array at the upper end of the shaft furnace 100 at the geometric center of the shaft furnace 100 so that the nuggets entering the shaft furnace 100 are easily flattened; in addition, the feed port 110 may be designed to be closable (e.g., a knife gate is provided at the location of the feed port 110) to prevent microwaves introduced into the shaft furnace 100 from leaking from the location of the feed port 110 by closing the feed port 110 after a sufficient amount of nuggets have been introduced into the shaft furnace 100.

Referring to fig. 1, the shaft furnace 100 has a constriction 140, which constricts around the discharge port 120, on the side near the discharge port 120 so that the thermally desorbed mass material converges toward the discharge port 120. The tap hole 120 may also be designed to be closable (e.g. a knife gate valve is provided at the location of the tap hole 120) in view of the need to block microwave leakage and to allow the cake to stay in the shaft furnace 100 for a period of time for its thermal desorption.

The shaft furnace 100 and the air pipe 200 may be configured as a detachable connection structure, for example, one end of the air pipe 200 penetrates the shaft furnace 100, and then the shaft furnace 100 is clamped and fixed at the penetrated position by a clamp structure or a flange structure.

The outer wall of the shaft furnace 100 may be coated with a heat-insulating coating, which is not particularly limited in thickness and is determined according to design requirements, to prevent heat loss.

In addition, in order to enable the extraction of the nuggets to be thermally desorbed to the location of the feed opening 110, in some embodiments, the apparatus further comprises a bucket elevator (not shown) for elevating the nuggets above the feed hopper to facilitate the introduction of the nuggets into the shaft furnace 100.

Referring to fig. 2, in some embodiments, the gas pipe 200 and the shaft furnace 100 are both circular pipes and are coaxially arranged such that the annular furnace 400 forms a circular furnace 400. It should be noted that, in some embodiments, the air pipe 200 and/or the shaft furnace 100 are not necessarily round pipes, but may be square pipes or other tubular members with polygonal or irregular cross sections, where the annular width of the annular hearth 400 is not a fixed value when the tubular members are used as the air pipe 200 and/or the shaft furnace 100, so that the annular width is not easy to adapt to the penetration range of microwaves; thus, in some preferred embodiments, the annular firebox 400 is circular in cross-section such that the shortest distance from any point on the outer side of the gas pipe 200 to the inner side of the shaft furnace 100 is the same for ease of identification and adjustment of the annular width.

Specifically, the microwave generators 300 are provided in plural, and the plural microwave generators 300 are spaced along the outer circumference of the cross section of the shaft furnace 100 and circumferentially arranged to circumferentially input microwaves into the annular furnace 400. It will be appreciated that the number of microwave generators 300 may be adapted to the outer circumference of the annular firebox 400 and may be determined according to design requirements. In fig. 2, the microwave output ports of five microwave generators 300 are circumferentially and equally spaced on the outer frame with respect to the geometric center of the shaft furnace 100 to uniformly input microwaves.

Referring to fig. 1, in some embodiments, the inner wall of the shaft furnace 100 is connected to the outer wall of the air pipe 200 through a supporting member 800, the supporting member 800 is hollow and is communicated with the inside of the air pipe 200, and a plurality of air inlets 220 are distributed on the wall of the supporting member 800. Specifically, the support 800 may be a linear tubular member having one end fixedly connected to the inner wall of the shaft furnace 100 and the other end penetrating and extending into the gas pipe 200. The tubular member is used for enhancing the connection stability between the shaft furnace 100 and the air pipe 200, and enabling the volatile gas to enter the tubular member through the air inlet 220 and then be input into the air pipe 200, so the arrangement of the supporting member 800 is also beneficial for the volatile gas to enter the air pipe 200, and the fluidity of the volatile gas in the annular hearth 400 is increased.

In some preferred embodiments, the plurality of supporting members 800 are arranged to diverge from the air pipe 200 to the side of the shaft furnace 100, and the air inlet holes 220 on the supporting members 800 are arranged toward the side of the discharge opening 120, so as to avoid the blocking of the air inlet holes 220 on the supporting members 800 by the blocks falling from above, and the air inlet holes 220 on the supporting members 800 on the side close to the inner wall of the shaft furnace 100 are relatively dense, so that volatile gas further from the air pipe 200 is easier to be input into the supporting members 800.

In some preferred embodiments, the air tube 200 is made of a thermally conductive material that allows the air flow within the air tube 200 to exchange heat with the mass through the air tube 200. In particular, the air tube 200 may be made of stainless steel, which provides good thermal conductivity and corrosion resistance. It will be appreciated that the further from the microwave generator 300 the block can absorb less microwave energy; if the air pipe 200 made of a heat conductive material is not provided, the thermal desorption rate of the lump material near the central axis of the shaft furnace 100 in the annular hearth 400 is relatively low, and in some embodiments in which the air pipe 200 is made of a heat conductive material, the hot air can conduct heat to the lump material near one side of the air pipe 200 when flowing in the air pipe 200, so that the temperature rising rate and the thermal desorption rate of the lump material at the inner side and the outer side of the annular hearth 400 are more balanced.

Referring to fig. 1, in some embodiments, the outlet 120 is higher than the air inlet 220, so that the hot air in the air pipe 200 moves from bottom to top. Specifically, a plurality of microwave generators 300 surround the outside of the shaft furnace 100 from top to bottom. It will be appreciated that the mass on the side near the discharge opening 120 has absorbed more microwave energy during the fall, such that the temperature of the lower side is higher than the temperature of the upper side within the annular furnace 400, but the mass on the lower side may have been sufficiently thermally desorbed and does not require excessive microwave energy radiation; the rising of the hot air at the lower side of the air pipe 200 is beneficial to driving the lower heat to the upper side and helping the upper block to heat up, thereby improving the energy utilization efficiency.

Referring to fig. 1, in some embodiments, the microwave generator 300 further includes a temperature detector 600 electrically connected to a controller (not shown), wherein one end of the probe of the temperature detector 600 extends into the support, and the microwave generator is controlled by the controller. Specifically, the temperature detector 600 may be a thermocouple, and the controller may be a PLC or DSP. The thermocouple stretches into the support piece, so that the thermocouple can be used for measuring the temperature of materials at a relatively short distance, the accuracy is improved, and the thermocouple is prevented from being damaged by material extrusion. In a preferred embodiment, the number of thermocouples is designed to be plural, and the plural thermocouples are projected into the annular furnace 400 at intervals in the height direction in order to measure the temperature at all places in the annular furnace 400.

In thermally desorbing the mass, the microwave output required to thermally desorb the mass varies from mass to mass due to the varying moisture content of the mass from mass to mass (generally, the lower the moisture content at the end closer to the discharge port 120). The temperature of each place in the shaft furnace 100 is monitored by a thermocouple, the monitoring data are transmitted to a controller, the controller compares the data with the data set in a preset program, and then a control signal is sent to the microwave generator 300 in a corresponding radiation range, so that the corresponding adjustment of the power is realized, and the thermal desorption of the lump matters is ensured timely and effectively.

In some embodiments, the microwave generator 300 further comprises an air pressure sensor (not shown) electrically connected with the controller, wherein a probe of the air pressure sensor extends into the support member to avoid damage to the air pressure sensor caused by material extrusion, and the microwave generator 300 is controlled by the controller. The air pressure sensor is used for detecting air pressure in the annular hearth 400 and transmitting air pressure data to the controller, and the controller compares the air pressure data with data set in a preset program. When the controller detects that the air pressure data is high, the controller controls the microwave generator 300 to reduce the output power, thereby slowing down the generation speed of the volatile gas and avoiding the rupture of the air pipe 200 or the shaft furnace 100 caused by the excessive air pressure in the annular hearth 400. Specifically, the shaft furnace and the air pipe are made of stainless steel materials, and the air pressure in the shaft furnace floats in the range of 20 Pa-1000 Pa.

Referring to fig. 1, in some embodiments, a discharging mechanism 700 capable of controlling the discharging speed is further disposed near the discharging port 120, and a feeding end of the discharging mechanism 700 is connected to the discharging port 120. Specifically, the discharging mechanism 700 may be a screw feeder, and a motor of the screw feeder may be electrically connected to the controller, where the screw feeder has a larger torque, so as to prevent the processed block from being jammed due to the adhesion.

In some preferred embodiments, the temperature in the shaft furnace 100 is measured by a thermocouple and the parameter is transmitted to a controller, the controller compares the parameter with a value in a preset program, when the parameter value is lower than the preset value, the controller sends a signal to the microwave generator 300 to control the microwave generator 300 to increase the power, and the controller sends a signal to a driving motor of the screw feeder to reduce the rotor speed of the driving motor of the screw feeder and ensure the thermal desorption effect of the lump matters in the shaft furnace 100; when the parameter value is higher than a preset value, the controller sends out a signal to the microwave generator 300 to control the microwave generator 300 to reduce power, and the controller is utilized to send out a signal to a driving motor of the spiral feeder to increase the discharging speed of the spiral feeder, so that the drying efficiency is improved on the premise of ensuring the thermal desorption effect of the block. The above measures can meet the thermal desorption conditions of the blocks with different magnitudes and different water contents, can ensure the thermal desorption efficiency, and is beneficial to saving energy.

In some embodiments, a negative pressure device is further included, disposed proximate to the air outlet 210, for creating a negative pressure region at the air outlet 210. Specifically, the negative pressure device may be a fan, and the negative pressure surface of the fan is disposed towards the air outlet 210, so as to drive the air in the shaft furnace 100 to be rapidly extracted. In some preferred embodiments, the blower is a variable frequency high pressure blower, and the pumping speed is adjusted according to the frequency of the blower.

In some embodiments, the trachea 200 comprises a bending section 230, and an included angle exists between the extending direction of the bending section 230 and the vertical direction. Specifically, referring to fig. 1, the bending section 230 is located at an end of the air pipe 200 extending out of the shaft furnace 100, such that the bending section 230 is located on a flow path of the volatile gas, and a 45 ° angle is formed between the connecting portion of the bending section 230 and other portions of the air pipe 200.

Because the air pipe 200 is provided with the plurality of air inlets 220, partial small-volume particles in the block can enter the air pipe 200 through the air inlets 220, the particles are carried by the volatilized air flow (the volatilized air is hot air flow and rises under the action of buoyancy), and can be discharged through the air outlet 210; in this embodiment, when the volatile gas flows to the bending section 230, the inner sidewall of the bending section 230 may block the particulate matters, so that a part of the particulate matters fall into the air pipe 200. In addition, the provision of the bent section 230 facilitates adjustment of the position of the air outlet 210.

In some preferred embodiments, to enable particulate matter in the air duct 200 to be discharged from the discharge port 120, the bottom end of the air duct 200 in the shaft furnace 100 is designed to be open, and a section of the air duct 200 in the shaft furnace 100 is a straight pipe extending in the vertical direction, so that particulate matter in the air duct 200 can fall out of the opening.

In some embodiments, the device further comprises a humidity sensor and a pressure sensor for detecting humidity and pressure in the block; the pressure sensor is used for measuring the pressure of each point in the block and assisting in judging the mass and the volume of the block in the device; the humidity sensor is used for measuring the water content in the block; the humidity sensor and the pressure sensor are electrically connected with a controller, and the controller controls the microwave output power of the microwave generator 300, the discharging speed of the discharging mechanism 700 and the like according to the detected humidity data and pressure data.

The specific working principle of the device is as follows: volatile substances in the blocks are converted into volatile gases under the action of microwave heating, the volatile gases flow from gaps among the blocks, enter the air pipe 200 from the air inlet 220 and are discharged from the air outlet 210, so that the volatile gases can be timely and smoothly discharged out of the shaft furnace 100 by the structure; the structural design of the inner and outer tubes facilitates control of the annular furnace 400 in terms of annular width, which, while maintaining the annular width unchanged, can be easily scaled up by increasing the outer diameter of the gas pipe 200 and the inner diameter of the shaft furnace 100, so that the amount of lumps that can be handled by the device is not limited by the microwave penetration distance.

Example two

The present embodiment provides a microwave material heating device, which is used for firing materials, and the difference between the embodiment and the implementation one is that: in this embodiment, the shaft furnace and the gas tube are ceramic tubes, and in this embodiment, the device is not limited to use for heating of the nuggets; it will be appreciated that ceramic materials having better heat resistance are required as the main materials for shaft furnaces and gas pipes because the temperatures during firing can be more than a thousand degrees.

Example III

The embodiment provides a soil remediation system, which comprises the microwave material heating device in the first embodiment, wherein the soil remediation system is used for remediating contaminated soil, and the contaminated soil may contain volatile petroleum hydrocarbon, polycyclic aromatic hydrocarbon and other pollutants and may also contain partial moisture. In the traditional soil remediation process, water is changed into water vapor after absorbing energy, the temperature rising rate of pollutants in a high-temperature section is reduced due to the existence of the water vapor, and the proper pollutant decomposition temperature is difficult to reach, so that the remediation efficiency is reduced, and the energy consumption of microwaves is wasted. In this application, the water vapor can be timely discharged through the air pipe 200, so as to avoid the interference of the moisture to the subsequent soil remediation process.

In some embodiments, the shaft furnace 100 lining forms a smooth guiding surface. Specifically, the liner of the shaft furnace 100 may be formed of a quartz layer; because the soil particles are larger, the clamping stagnation is easy to occur in the shaft furnace 100, and the inner surface of the quartz layer has the characteristic of smoothness, so that the clamping stagnation of the soil in the shaft furnace 100 can be avoided, and the orderly conveying of the soil is convenient to ensure.

In some embodiments, the soil remediation system further includes an ignition device disposed proximate to the air outlet 210 for combusting exhaust gases exiting the air outlet 210. In particular, the ignition device may be a liquified igniter; fig. 3 shows a table diagram of boiling points of a part of benzene and phenol compounds, and it can be seen that most common benzene and phenol compounds can be volatilized by heating soil to about 300 ℃, and then the volatilized gas is combusted by an ignition device to generate harmless carbon dioxide and water, so as to solve the pollution problem of exhaust emission.

In some preferred embodiments, the soil remediation system further comprises a dust collector, which may be a cyclone dust collector and/or a pulse bag dust collector. The dust remover is connected with the air outlet 210, and most of carried particulate matters are removed by the volatile gas through the dust remover, and then the volatile gas is combusted through the ignition device.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (10)

1. A microwave heating material device, comprising:

the upper end and the lower end of the shaft furnace respectively form a feed inlet and a discharge outlet, so that the materials can fall from high to low;

the air pipe is sleeved in the shaft furnace, an annular hearth for guiding in the materials is formed between the air pipe and the shaft furnace, one end of the air pipe extends out of the shaft furnace and forms an air outlet, and a plurality of air inlets are distributed on the pipe wall of the air pipe in the shaft furnace;

a microwave introduction window disposed around the shaft furnace;

and the microwave generator is used for inputting microwaves into the annular hearth in a surrounding manner through the microwave introducing window, and the annular width of the annular hearth is smaller than the maximum penetration range of the microwaves in the materials.

2. The microwave heating material device according to claim 1, wherein the air pipe and the shaft furnace are both circular pipes and are coaxially arranged such that the annular hearth forms a circular annular hearth.

3. The microwave material heating device according to claim 1, wherein the inner wall of the shaft furnace is connected with the outer wall of the air pipe through a supporting piece, the supporting piece is hollow and communicated with the inner part of the air pipe, and a plurality of air inlets are distributed on the pipe wall of the supporting piece.

4. A microwave material heating apparatus according to claim 3, further comprising an electrically connected temperature detector and controller, wherein one end of the probe of the temperature detector extends into the support, and wherein the microwave generator is controlled by the controller.

5. A microwave material heating apparatus according to claim 3, further comprising an air pressure sensor electrically connected to the controller, wherein one end of the probe of the air pressure sensor extends into the support, and wherein the microwave generator is controlled by the controller.

6. The microwave material heating apparatus according to claim 1, wherein a plurality of the microwave generators are provided, and a plurality of the microwave generators are provided at intervals in a height direction of the shaft furnace; the relative height of the discharge hole is higher than that of any air inlet hole, so that the hot air in the air pipe moves from bottom to top.

7. The microwave heating material device according to claim 1, wherein a discharging mechanism capable of controlling a discharging speed is further arranged near the discharging hole, and a feeding end of the discharging mechanism is connected with the discharging hole.

8. The microwave heating material device as in claim 1, further comprising a negative pressure device disposed proximate the air outlet for creating a negative pressure region at the air outlet.

9. A soil remediation system comprising a microwave heating apparatus as claimed in any one of claims 1 to 9.

10. The soil remediation system of claim 9 further comprising an ignition device, the ignition device being disposed proximate the air outlet.