CN203484406U - Multi-heat source shaft interval-heating thermal desorption device for repairing soil polluted by organic matter - Google Patents

Abstract

The utility model relates to the field of environmental protection and aims to provide a multi-heat-source interaxial heat-type thermal desorption device for remediation of organic-contaminated soil. The indirect thermal desorber of the device is a jacketed heating furnace; the outer cylinder is provided with a soil feed port, an excavator, the first multi-heat source inlet, and the first multi-heat source outlet; the inner cylinder is provided with a carrier gas inlet , Carrier gas outlet; the hollow shafted rotary shaft of the jacket structure composed of the outer sleeve and the hollow inner sleeve is provided with the second multi-heat source outlet and the second multi-heat source outlet respectively connected with the outer shaft sleeve or the inner shaft sleeve Heat source inlet; the utility model can effectively treat organic pollutant-contaminated soil, and is especially suitable for site restoration of high-concentration and multi-component organic pollutant-contaminated soil; it has good adaptability to various heat sources and improves the comprehensive utilization efficiency of heat sources; The soil treatment capacity per unit time is large, and it is especially suitable for sandy polluted soil. For organic pollutant-contaminated soil, the removal efficiency of organic pollutants can reach more than 99.9%.

Description

Multi-heat source interaxial thermal thermal desorption device for remediation of organic matter-contaminated soil

technical field

The utility model relates to a set of organic pollutant polluted soil restoration device, which desorbs organic pollutants in soil through an indirect thermal desorption system, and belongs to the field of environmental protection.

Background technique

A large amount of soil in my country has been polluted by organic pollutants. The types of pollutants include pesticides used in agricultural production, polychlorinated biphenyls used in the power industry, and accidental oil spills in the oil industry. With the gradual public awareness of the environmental and health hazards of organic pollutants, there is an urgent need for economical and effective methods to deal with these toxic substances.

The main remediation technologies for soil contaminated by organic pollutants include biological remediation, chemical remediation, and physical remediation. Bioremediation is mostly in-situ repair, which has small investment, low operating cost, mild operating conditions, and little environmental interference, but the bioremediation cycle is long, and it is limited by the types of plants or microorganisms, and can only deal with certain types of organic pollution. substances, and can only be applied under low concentration conditions; physical remediation or chemical remediation is mostly ectopic remediation, with large initial investment and high operating costs, but the remediation period is short, and it is suitable for various types of organic pollutants and high Concentration pollution site. In comparison, physical remediation or chemical remediation has wider applicability, especially for high-concentration, multi-component organic pollution contaminated sites.

Among many physical or chemical remediation technologies, thermal desorption is recognized as a mature and reliable technology for treating organic matter-contaminated soil, and is one of the most widely used remediation technologies for organic matter-contaminated sites. Thermal desorption technology has good adaptability to different types and concentrations of organic pollutants, and at the same time, the repair speed is fast and the cycle is short. According to the heating method, thermal desorption technology can be divided into direct heating type and indirect heating type. The heat source of the direct heating technology is in direct contact with the polluted soil, which has high heat transfer efficiency and large processing capacity, but produces a large amount of harmful gas that needs further treatment; the heat source of the indirect heating technology does not directly contact the polluted material, and the heat transfer efficiency is low, but it needs to The amount of harmful gas processed is small, and it is especially suitable for the treatment of soil contaminated by highly toxic organic substances.

However, the current indirect thermal desorption technology still has the following defects: the structure of the thermal desorber is complex, the construction cost is high, and the operation is inconvenient; the heat transfer efficiency is low, and the energy utilization efficiency is low; Use low-taste energy. It has poor adaptability to soils of different textures, and soil bonding is prone to occur during thermal desorption.

Utility model content

The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a multi-heat source interaxial thermal desorption device for remediation of organic-contaminated soil.

For solving technical problems, the solution of the utility model is:

Provided is a multi-heat source and axial interthermal thermal desorption device for remediation of organic-contaminated soil, including a thermal desorber; the thermal desorber is an indirect thermal desorber, which is a jacketed heating furnace;

The indirect thermal desorber includes an inner cylinder and an outer cylinder arranged in a horizontal direction, and ribs are arranged on the outer wall of the inner cylinder to promote heat transfer; a soil feed port connected to the inner cylinder is provided on the upper part of the front end of the outer cylinder, The lower part of the inner cylinder rear end is provided with an excavator; the upper part of the outer cylinder rear end is provided with a first multi-heat source inlet for passing into the heat carrier, and the lower part of the outer cylinder front end is provided with a first multi-heat source outlet; the lower part of the inner cylinder front end is provided with There is a carrier gas inlet for feeding the carrier gas, and a carrier gas outlet is provided at the upper part of the rear end of the inner cylinder; the flow path of the heat carrier in the outer jacket of the inner cylinder is opposite to the movement direction of the soil in the inner cylinder, and the flow of the carrier gas in the inner cylinder The flow paths are all in the same direction as the soil movement in the inner cylinder;

A hollow rotating shaft is provided on the center line of the inner cylinder, which is a hollow shafted rotating shaft with a jacket structure composed of an outer sleeve and a hollow inner sleeve; one end of the hollow rotating shaft is provided with a second multi-heat source outlet and The second multi-heat source inlet for passing through the heat carrier; the second multi-heat source outlet and the second multi-heat source inlet are respectively connected to the outer shaft sleeve or the inner shaft sleeve, and the selection of the installation method makes the flow direction of the heat carrier in the outer shaft sleeve Opposite to the movement of the soil in the inner barrel.

In the utility model, a conveyor is arranged at the lower end of the excavator, and a humidifier is arranged above the conveyor.

In the utility model, the multi-heat source inlet is connected to the high-temperature flue gas outlet of the fuel oil, the exhaust gas outlet of the waste heat boiler or the exhaust gas outlet of the power plant boiler.

Compared with the prior art, the utility model has the beneficial effects of:

The multi-heat source interaxial thermal desorption device for the remediation of organic polluted soil of the utility model can perform thermal desorption on the soil through indirect heating, and can effectively treat the soil polluted by organic pollutants, and is especially suitable for high concentration, Remediation of soil contaminated by multi-component organic pollutants; good adaptability to various heat sources, and the appropriate heat source can be selected according to the physical and chemical properties of the target organic pollutants, which improves the comprehensive utilization efficiency of heat sources; adopts indirect thermal desorption The device reduces the amount of flue gas to be treated; the design of the outer wall of the inner cylinder with fins is adopted, and at the same time, multiple heat sources and soil move in opposite directions, which promotes the heat exchange between multiple heat sources and soil and increases the heat transfer efficiency; The rotary shaft has a large soil treatment capacity per unit time, and is especially suitable for sandy polluted soil. For soil polluted by organic pollutants, this device can achieve a removal efficiency of more than 99.9% of organic pollutants. The multi-heat source for the remediation of organic-contaminated soil of the utility model has an inter-axial thermal desorption device, which requires less flue gas treatment, complete removal of organic pollutants, and lower operating costs by 30-60% compared with incineration and other technologies, which is economical and effective The treatment of organic pollutants polluted soil.

Description of drawings

Fig. 1 is the technological process schematic diagram of the present utility model.

Reference signs in the figure: 1 soil feed inlet, 2 outer cylinder, 3 inner cylinder, 4 motor, 5 hollow rotating shaft, 6 first multi-heat source inlet, 7 first multi-heat source outlet, 8 carrier gas inlet, 9 carrier gas Exit, 10 excavators, 11 conveyors, 12 humidifiers, 13 fins, 14 second multi-heat source inlets, 15 second multi-heat source outlets.

Detailed ways

With reference to the above-mentioned accompanying drawings, the technical content of the present utility model is described in detail.

The multi-heat sources used for remediation of organic-contaminated soil include an interaxial thermal desorption device, including a thermal desorber; the thermal desorber is an indirect thermal desorber, which is a jacketed heating furnace;

The indirect thermal desorber includes an inner cylinder 3 and an outer cylinder 2 arranged in a horizontal direction. Ribs 13 are arranged on the outer wall of the inner cylinder 3 to promote heat transfer; The soil feed port 1 in the middle is provided with an excavator 10 at the bottom of the urceolus 2 rear end;

The upper part of the outer cylinder 2 rear end is provided with the first multi-heat source inlet 6 for passing into the heat carrier, and the first multi-heat source outlet 7 is provided at the lower part of the front end of the outer cylinder 2; the lower part of the inner cylinder 3 front end is provided with for passing into the carrier gas The upper part of the carrier gas inlet 8 and the inner cylinder 3 rear end is provided with a carrier gas outlet 9; the flow path of the heat carrier in the outer jacket of the inner cylinder 3 is opposite to the movement direction of the soil in the inner cylinder 3, and the carrier gas in the inner cylinder 3 The flow path in the inner cylinder is in the same direction as the soil movement in the inner cylinder 3.

A hollow rotating shaft 5 is provided on the center line of the inner cylinder 3, which is a hollow shafted rotating shaft with a jacket structure composed of an outer bushing and a hollow inner bushing; Heat source outlet 15 and the second multi-heat source inlet 14 that is used to pass into heat carrier; The flow direction of the carrier in the outer sleeve is opposite to the movement direction of the soil in the inner cylinder.

The first multi-heat source inlet 6 and the second multi-heat source inlet 14 are respectively connected to the fuel oil high-temperature flue gas outlet, waste heat boiler exhaust gas outlet or power plant boiler exhaust gas outlet.

In the present utility model, utilize aforementioned device to realize the method for remediation of organic matter polluted soil, comprise the following steps:

Organic matter polluted soil enters the inner cylinder 3 at a fixed rate from the soil feed port 1;

Introduce high-temperature flue gas at 300-1300°C, waste heat boiler exhaust gas or power plant boiler exhaust gas from the multi-heat source inlet 6 into the jacket between the inner cylinder 3 and the outer cylinder 2, the flow path of the heat carrier in the jacket and the inner cylinder 3 The soil movement direction in the inner cylinder is opposite; the inert gas is introduced into the inner cylinder 3 from the carrier gas inlet 8, and the flow path of the carrier gas in the inner cylinder 3 is the same as the soil movement direction in the inner cylinder 3; the second multi-heat source inlet 14 introduces 300 High-temperature flue gas at ~1300°C, waste heat boiler exhaust gas or power plant boiler exhaust gas enters the hollow rotating shaft 5, and the flow direction of the heat carrier in the outer shaft sleeve is opposite to the movement direction of the soil in the inner cylinder;

The soil is heated to 220-600°C in the inner cylinder 3, and the organic pollutants are desorbed and carried by the inert gas; after thermal desorption treatment, more than 99.9% of the organic pollutants are desorbed, and the clean The soil is discharged by the excavator 10, and is discharged by the conveyor 11 after being sprayed and humidified by the humidifier 12;

After the heat carrier leaves the multi-heat source interaxial thermal desorption device, it enters the waste heat utilization device to recover waste heat or discharge it directly; the inert gas carrying organic pollutants enters the tail gas treatment facility for treatment;

The first multi-heat source and the second multi-heat source are respectively any one of high-temperature flue gas at 300-1300°C, waste heat boiler exhaust gas or power plant boiler exhaust gas; the sum of the consumption of the first multi-heat source and the second multi-heat source and the soil The relationship between the processing volumes is expressed by the following formula:

Among them, M _{multi-heat source} is the hourly consumption of the first multi-heat source and the second multi-heat source, M _soil is the amount of soil processed by the multi-heat source non-axial interthermal thermal desorption device per hour, C _soil is the specific heat capacity of soil, and ΔT _soil is The temperature value of soil rising in the reciprocal thermal desorption device, Q _{multi-heat source} is the calorific value of multi-heat source per kilogram, and η _heat is the comprehensive heat transfer efficiency of multi-heat source to soil.

After the above process, the organic pollutants in the soil are effectively controlled, and a good soil restoration effect is achieved.

Finally, it should also be noted that what is listed above is only a specific embodiment of the present invention. Obviously, the present invention is not limited to the above embodiments, and many modifications are possible. All deformations that a person skilled in the art can directly derive or associate from the content disclosed in the utility model shall be considered as the protection scope of the utility model.

Claims (3)

1. The multi-heat source used for remediation of organic-contaminated soil has an interaxial thermal desorption device, including a thermal desorption device, which is characterized in that the thermal desorption device is an indirect thermal desorption device, which is a jacket type heating furnace; The indirect thermal desorber includes an inner cylinder and an outer cylinder arranged in a horizontal direction, ribs are arranged on the outer wall of the inner cylinder to promote heat transfer; a soil feed port connected to the inner cylinder is provided on the upper part of the front end of the outer cylinder , The lower part of the inner cylinder rear end is provided with an excavator; the upper part of the outer cylinder rear end is provided with a first multi-heat source inlet for passing through the heat carrier, and the lower part of the outer cylinder front end is provided with a first multi-heat source outlet; the lower part of the inner cylinder front end There is a carrier gas inlet for passing through the carrier gas, and a carrier gas outlet is provided at the upper part of the rear end of the inner cylinder; the flow path of the heat carrier in the outer jacket of the inner cylinder is opposite to the movement direction of the soil in the inner cylinder, and the carrier gas in the inner cylinder The flow paths of the soil are in the same direction as the soil movement in the inner cylinder; A hollow rotating shaft is provided on the center line of the inner cylinder, which is a hollow shafted rotating shaft with a jacket structure composed of an outer sleeve and a hollow inner sleeve; one end of the hollow rotating shaft is provided with a second multi-heat source outlet and The second multi-heat source inlet for passing through the heat carrier; the second multi-heat source outlet and the second multi-heat source inlet are respectively connected to the outer shaft sleeve or the inner shaft sleeve, and the selection of the installation method makes the flow direction of the heat carrier in the outer shaft sleeve Opposite to the movement of the soil in the inner barrel. 2. The device according to claim 1, wherein a conveyor is arranged at the lower end of the excavator, and a humidifier is arranged above the conveyor. 3. The device according to claim 1, characterized in that the first multi-heat source inlet and the second multi-heat source inlet are respectively connected to the fuel high-temperature flue gas outlet, waste heat boiler exhaust gas outlet or power plant boiler exhaust gas outlet.

Images