37results about How to "Improve thermal desorption efficiency" patented technology

The invention provides a system for repairing polycyclic aromatic hydrocarbon contaminated soil. The system is provided with soil pretreatment equipment, chemical oxidation equipment, thermal desorption equipment, soil accumulation equipment and flue gas dust removal equipment in sequence. Conveying belts are arranged between the soil pretreatment equipment, the chemical oxidation equipment, the thermal desorption equipment and the soil accumulation equipment. The thermal desorption equipment communicates with the flue gas dust removal equipment through a pipeline. The soil accumulation equipment communicates with the soil pretreatment equipment through a pipeline. The invention further provides a method for repairing the polycyclic aromatic hydrocarbon contaminated soil. According to the system and method for repairing the polycyclic aromatic hydrocarbon contaminated soil, chemical oxidation and low-temperature thermal desorption are combined, and therefore the removal rate of polycyclic aromatic hydrocarbon of the soil can reach 99%, the repairing effect of the contaminated soil can be effectively improved, and the repairing period can be effectively shortened.

The invention belongs to the technical field of oily sludge treatment and particularly relates to a pyrolysis desorption reaction kettle and treatment equipment including the same for oily sludge of an offshore platform. The pyrolysis desorption reaction kettle comprises a body (1), wherein a material inlet (11), a material outlet (12) and a pyrolysis gas outlet (13) are formed in the body (1), a material conveying mechanism is arranged in the body (1), and the pyrolysis desorption reaction kettle is vertically distributed; and the material conveying mechanism comprises a disc dryer (2) and a single-shaft double-helix stirrer (3), the disc dryer (2) for generating a transverse centrifuging effect to materials is arranged in an upper space in the pyrolysis desorption reaction kettle, and the single-shaft double-helix stirrer (3) for generating a vertical rolling effect to the materials is arranged in a lower space in the pyrolysis desorption reaction kettle. According to the treatment equipment including the pyrolysis desorption reaction kettle for the oily sludge of the offshore platform, the occupied area of the equipment is reduced, and meanwhile, the treatment efficiency of the oily sludge is improved.

The invention discloses an organic matter soil restoration device. The device is characterized by comprising a blower, a soil restoration box, a membrane separation system, a vacuum pump, a condenser and an organic matter collection tank, wherein a soil feed opening is formed in the upper part of the soil restoration box; a soil discharge opening is formed in the side face of the soil restoration box; the soil feed opening is connected with a soil breaking box; the soil discharge opening is connected with a soil cooling box; the soil cooling box is externally provided with a discharge device. The device has the benefits that the device can achieve continuous feeding, has high polluted soil treatment capacity, adopts a direct heating manner, has high heat desorption efficiency, employs the membrane separation system to treat exhaust gas and does not generate secondary pollution.

The invention provides an atmospheric pollutant real-time sampling and analysis device and a method. The device comprises a particulate matters online sampling unit, an environment gas component sampling unit, a soft ionization device and a mass spectrometer; the particulate matters online sampling unit comprises an atmosphere intake pipeline, a rotary table component, a first gas guiding flexiblepipe, a sucking pump, a film heating component, a first three-way valve and a nitrogen high pressure bottle. The device and the method provided by the invention have the following advantages: (1) reactive ions with relatively high reaction activity are generated through plasmas, the reactive ions react with a compound desorbed from a sampling film, thus, analyzable sample range of the device is expanded, and method sensitivity is improved; a sample is enabled to pass through a plasma generation device, contact area and time between the sample and the plasmas can be improved, and efficiency isimproved; (2) a plurality of particulate matters sampling films are mounted on the rotary table, thus, frequency of halting and changing the films is reduced, sample collection efficiency is improved, and operation steps are simplified; (3) the particulate matters sampling films are directly heated through a honeycomb window, and particulate state sample thermal desorption efficiency is improved.

The invention relates to a movable multifunctional module thermal desorption system. Equipment of the system is divided into three modules; the module I comprises a thermal desorption rotary kiln 1; the module II comprises a cyclone dust collector 2, a secondary combustion chamber 3, a heat exchanger 4, a spray cooling tower 5, an alkali absorption tower 7, an automatic control system 13 and a steam-water separator 14; the module III comprises a bag type dust collector 6, an activated carbon absorber 8, a biofilter 9, an induced draft fan 10, an exhaust device 11 and a booster fan 12; the equipment of the module I, the module II and the module III are respectively arranged on movable equipment. The system is suitable for four process routes including high-concentration and high-toxicity organic compound contaminated sites, general volatile/semi-volatile organic compound contaminated sites, acidic organic compound contaminated sites and organic sulfide and ammonia-nitrogen organic compound contaminated sites; different process routes and equipment can be accurately and effectively provided according to different organic compound contaminated sites, so that the time for designing a technical route is reduced, and the transportation and onsite loading and unloading are convenient.

The invention relates to a modifier enhanced thermal desorption remediation method for a polycyclic aromatic hydrocarbon (PAHs) contaminated site, which comprises the steps of (1) pretreating contaminated soil, crushing, grinding, screening, and adjusting the moisture content of the PAHs contaminated soil to obtain a standby soil sample; (2) adding a modifier into the standby soil sample by adopting a dry mixing method, and carrying out modification treatment for 24 hours to obtain modified soil; and (3) carrying out modifier enhanced thermal desorption treatment on the modified soil at the temperature of 100-300 DEG C for a certain time, and cooling after thermal desorption treatment to obtain the remediated soil. According to the method, the PAHs contaminated soil is modified through the modifier to strengthen the thermal desorption process of the PAHs, so that the desorption efficiency of the whole thermal desorption process is improved, the remediation cost is reduced, the cost effectiveness of the thermal desorption technology is also improved, and the method has a good application prospect.

The invention relates to an organic matter contaminated soil movable four-roller continuous rotation thermal desorption treatment system. The treatment system comprises a soil feeding system, a heating system, a rotation thermal desorption system, a dust and mist removing system, an activated carbon adsorption system, a tail gas treatment system and a control system. The system can achieve continuous feeding, the contaminated soil treatment amount is large, and automatic control is achieved; the direct heating manner is adopted, the high-temperature steam makes sufficient contact with contaminated soil in the rotation thermal desorption system, and the thermal desorption efficiency is extremely high; and the adsorption manner is adopted for tail gas treatment, secondary pollution cannot begenerated, and environment protection is facilitated.

The invention provides a method for removing persistent organic pollutants in soil. The method includes the following steps that step one, soil pretreatment is performed; step two, continuous soil leaching is performed; step three, degradation of the persistent organic pollutants and heavy metal recovery are performed; and step four, pyrolysis and high-voltage pulse discharge oxidation are performed. A soil loosening agent is mixed with the soil first to avoid the aggregation of the soil due to the effects of ultrasound, leaching pressure and leaching agent components in the leaching process,and can further solubilize in synergy with the cavitation effect of ultrasound, and most of the persistent organic pollutants are removed by leaching; and then in the pyrolysis-high-voltage pulse discharge oxidation process, heating and temperature rising are performed first, the desorption and decomposition of the persistent organic pollutants can be promoted, and the high-temperature environmentimproves the use ratio of high-voltage pulse energy. The method is simple in process and mature in equipment, saves manpower and material resources, is high in removal rate of the persistent organicpollutants and heavy metal in soil and thorough in removal, and has no secondary pollution.

The invention discloses an external-heating double-position spiral drying roasting kiln for ex-situ remediation of soil. The furnace comprises upper and lower furnace bodies, wherein two furnace tubesare arranged in each of the upper and lower furnace bodies; a feeding bin is connected with a feeding hole of the upper furnace tube through a rotary vane type feeder; a rotary vane feeder is connected with a driving motor with a frequency converter; spiral conveying augers are arranged in the upper furnace tube and the lower furnace tube and are connected with a transmission speed reducer with afrequency converter; the working frequency of the rotary vane feeder is equal to the spiral conveying frequency of the spiral conveying auger, so that the consistency of front and back feeding speedsis ensured; the right sides of the upper furnace tube and the lower furnace tube are vertically communicated; a discharge conveyor is arranged at a discharge hole in the bottom of the lower furnace tube; a water spraying humidifier is arranged at the top of the upper furnace tube; and a combustor is arranged at bottom of furnace body. The spiral drying roasting kiln is small in size, low in siterequirement, high in thermal desorption efficiency, low in equipment failure rate and low in energy consumption; in the spiral drying roasting kiln, the furnace tube adopts a segmented flange connection mode, so that the service life of the furnace tube can be prolonged, the furnace tube replacement cost is reduced, gaps between the furnace tube and a hearth can be eliminated, and heat dissipationis reduced.

The invention relates to an ex-situ thermal desorption remediation device and remediation method for soil. The device includes a construction platform for stacking polluted soil piles to be treated and a thermal insulation layer which is spread on the tops of the polluted soil piles to be treated; the construction platform is provided with a concrete layer, a heat insulation layer, a water filterlayer and a geotextile in sequence from the bottom to the top; the interior of the water filter layer is provided with a water collection cavity, and the interior of the water collection cavity is provided with a submersible pump for discharging water; an anti-seepage film is spread on the thermal insulation layer; and water suction pipes, heating pipes and gas suction pipes which are inserted into the polluted soil piles to be treated are also arranged. The device provided by the invention has the beneficial effects of a large treatment amount of polluted soil, high efficiency of thermal desorption, convenient reutilization of equipment and high cost performance.

The invention relates to a chemical-thermal desorption combined remediation method for polycyclic aromatic hydrocarbon contaminated soil. The method comprises the following steps: 1, pretreatment of the contaminated soil: sequentially crushing, grinding and screening the polycyclic aromatic hydrocarbon contaminated soil, and then adjusting the moisture content of the soil to obtain a soil sample for later use; 2, chemical pre-oxidation treatment: adding an oxidizing agent into the soil sample by adopting a dry mixing method to carry out chemical pre-oxidation treatment; and 3, thermal desorption: performing thermal desorption treatment on the soil subjected to pre-oxidation treatment under a medium-temperature condition, and then cooling to room temperature. According to the method, the contaminated soil is pre-oxidized through the oxidizing agent containing benzoyl peroxide, then the PAHs contaminated soil is subjected to thermal desorption treatment, the PAHs removal efficiency can be improved, meanwhile, the remediation temperature can be reduced, and therefore the purposes of reducing remediation energy consumption and remediation cost are achieved.

The invention discloses equipment for fertility-increasing thermal desorption soil remediation, and relates to the technical field of soil remediation. The equipment for fertility increasing type thermal desorption soil remediation comprises a bearing plate, three sets of bearing columns are fixedly installed at the top of the bearing plate, two sets of discharging openings are formed in the bearing plate, a thermal desorption box is arranged at the top of the bearing plate, a fermentation manure tank is welded to the outer surface of the top of the bearing plate, and rotating columns are rotatably installed on the adjacent side walls of the two sets of bearing columns. According to the equipment, soil subjected to thermal desorption and a fertilizer can be added into a mixing box according to a certain proportion, the situation that the fertilizer increasing effect is poor or excessive due to proportion imbalance is avoided, the follow-up soil fertilizer increasing effect is effectively guaranteed, the quantitative proportion is adjustable, and the diversity of the fertilizer increasing proportion is enhanced. Loss caused by the fact that the quantitative proportion cannot be adjusted due to different properties of soil in all places is avoided, the error-tolerant rate of the equipment is increased, and a foundation is effectively laid for next-step mixed fertilization.

The invention relates to a vertical soil thermal desorption device with internal and external heating and self-weight discharging functions. The device comprises an inner channel and an outer channel arranged outside the inner channel in a sleeving mode, and a gas channel and a flue which are independent of each other are formed in a gap between the inner channel and the outer channel; a plurality of thermal desorption units are arranged in the inner channel, each thermal desorption unit structurally comprises a movable baffle and a heating cavity, and a flue gas inlet and a flue gas outlet which are communicated with the flue are formed in the two ends of each heating cavity respectively; each heating cavity is provided with at least one arc plate, the arc plate and the movable baffle form a soil heating area, and the movable baffle rotates around a rotating shaft at the top of the movable baffle under the action of soil pressure, so that soil slides into the soil heating area of the next thermal desorption unit along the arc plate; and a snakelike heating chamber is formed between each heating cavity and the wall surface of the inner channel, and the heating chamber is communicated with the gas channel and is used for discharging gaseous pollutants separated out during desorption. The technical problems of uneven heating and low heating rate are solved.