CN111203435A - Organic contaminated soil remediation system and remediation method - Google Patents
Organic contaminated soil remediation system and remediation method Download PDFInfo
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- CN111203435A CN111203435A CN202010126274.0A CN202010126274A CN111203435A CN 111203435 A CN111203435 A CN 111203435A CN 202010126274 A CN202010126274 A CN 202010126274A CN 111203435 A CN111203435 A CN 111203435A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
- B01D53/44—Organic components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention provides an organic contaminated soil remediation system and a remediation method, the remediation system comprises a combustion chamber, an indirect heating rotary kiln, a first heat exchanger and a second heat exchanger, a flue gas outlet of the combustion chamber is communicated with a flue gas inlet of the indirect heating rotary kiln, a flue gas outlet and a soil outlet of the indirect heating rotary kiln are respectively communicated with the first heat exchanger, an organic waste gas outlet of the indirect heating rotary kiln is communicated with the second heat exchanger, and a first air outlet of the first heat exchanger and a second air outlet of the second heat exchanger are communicated with the combustion chamber. The repairing method comprises the following steps: a) burning gas; indirectly heating the organic contaminated soil to obtain first soil, first flue gas and organic waste gas; b) the first soil and the first flue gas exchange heat with first cold air; c) the organic waste gas exchanges heat with the second cold air; d) the heated first cold air and the heated second cold air are combusted with the fuel gas in the step a). The invention has the advantages of energy saving, consumption reduction, simple flow and contribution to soil remediation.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a remediation system and a remediation method for organic contaminated soil.
Background
With the development of industrialized processes in China, the construction of standardized parks, and the relocation of many factories to new parks, soil pollution in old sites is serious, the remediation is difficult to be carried out by depending on the self-purification of the soil, and some environmental protection technologies are needed for rapid remediation. The soil remediation technology can divide the remediation method of the contaminated soil into physical remediation, chemical remediation, biological remediation and the like according to the remediation principle. The method is divided into in-situ remediation and ex-situ remediation according to remediation sites, namely, the polluted soil is treated in situ or treated in different places. The ex-situ thermal desorption is used as a non-combustion technology, the pollutant treatment range is wide, the equipment is movable, the repaired soil can be reused, particularly, the generation of dioxin can be avoided by using a treatment mode of non-oxidative combustion on chlorine-containing organic matters, and the method is widely used for repairing the soil polluted by organic pollutants. The fluidized bed type thermal desorption polluted soil is contacted with hot air in a suspension state and transfers heat, the energy utilization rate is low, the treatment capacity of generated waste gas is large, and the equipment investment is large.
Disclosure of Invention
The invention aims to provide a system and a method for restoring organic contaminated soil, which aim to solve the problems of high thermal desorption energy consumption, large waste gas treatment capacity and large equipment investment in the prior art.
In order to achieve the above and other related objects, a first aspect of the present invention provides an organic contaminated soil remediation system, including a combustion chamber, an indirect heating rotary kiln, a first heat exchanger and a second heat exchanger, wherein the combustion chamber is provided with a combustion flue gas outlet, the indirect heating rotary kiln is provided with a flue gas inlet, a flue gas outlet, a soil inlet, a soil outlet and an organic waste gas outlet, the first heat exchanger is provided with a first air inlet and a first air outlet, the second heat exchanger is provided with a second air inlet and a second air outlet, the combustion chamber flue gas outlet is communicated with the flue gas inlet, the flue gas outlet and the soil outlet are respectively communicated with the first heat exchanger, the organic waste gas outlet is communicated with the second heat exchanger, and the first air outlet and the second air outlet are communicated with the combustion chamber.
In the organic contaminated soil remediation system, the first heat exchanger is used for recovering the heat of the soil and the flue gas output from the indirect heating rotary kiln, and the recovered heat is used for heating the first cold air input from the first air inlet, so that the generated waste heat is fully utilized, and the energy consumption is reduced; the second heat exchanger is used for recovering heat of the organic waste gas output from the indirect heating rotary kiln, and the recovered heat is used for heating second cold air input from the second air inlet, so that the generated waste heat is fully utilized, and the energy consumption is reduced; the flue gas from the combustion chamber output indirectly heats the organic contaminated soil through the indirect heating rotary kiln, and organic waste gas volatilized from the organic contaminated soil does not contact with the flue gas from the combustion chamber and directly enters subsequent treatment equipment, so that the waste gas treatment capacity is reduced, and the equipment investment cost is reduced.
Preferably, at least one of the following technical features is also included:
1) the combustion chamber is provided with a gas inlet and an air inlet, and the first air outlet and the second air outlet are communicated with the air inlet. The gas inlet is used for introducing gas combusted in the combustion chamber; the air inlet is used for introducing air combusted in the combustion chamber, namely introducing fuel gas, the first cold air after heat exchange and the second cold air into the combustion chamber;
2) the first heat exchanger can also be provided with a first heat exchanger soil inlet and a first heat exchanger flue gas inlet, the flue gas outlet is communicated with the first heat exchanger flue gas inlet, and the soil outlet is communicated with the first heat exchanger soil inlet. The first heat exchanger soil inlet is used for inputting soil output from the indirect heating rotary kiln; the first heat exchanger flue gas inlet is used for inputting flue gas output from the indirect heating rotary kiln;
3) the first heat exchanger can also be provided with a first heat exchanger soil outlet and a first heat exchanger flue gas outlet. The first heat exchanger soil outlet is used for outputting the restored soil; the first heat exchanger flue gas outlet is used for outputting flue gas;
4) the second heat exchanger is also provided with a liquid outlet, and the organic matter liquid generated by the second heat exchanger is output from the liquid outlet. The second heat exchanger can be a dividing wall type heat exchanger, such as a shell-and-tube type heat exchanger, if the organic waste gas output from the indirect heating rotary kiln is introduced into a tube side, the tube side is provided with a liquid outlet and a gas outlet, a small amount of condensed organic liquid generated after heat exchange is output from the liquid outlet, and the organic waste gas after heat exchange is output from the gas outlet;
5) the organic contaminated soil remediation system further comprises a first fan, and the first air outlet and the second air outlet are communicated with the combustion chamber through the first fan. The first fan is used for introducing the first air output by the first heat exchanger and the second air output by the second heat exchanger into the combustion chamber.
More preferably, in the feature 4), the organic contaminated soil remediation system further comprises a buffer tank, and the liquid outlet is communicated with the buffer tank. The amount of the organic liquid after heat exchange is less, and the organic liquid is output after accumulating to a certain amount in the buffer tank.
Preferably, the organic contaminated soil remediation system further comprises a dust remover, an oxidation furnace, a washing tower and a chimney, and the second heat exchanger is communicated with the dust remover, the oxidation furnace, the washing tower and the chimney in sequence. The dust remover, the oxidation furnace, the washing tower and the chimney are used for further treating the organic waste gas output from the indirect heating rotary kiln after heat exchange, and the treated organic waste gas can be directly discharged, so that secondary pollution is avoided. The dust remover ensures the long-term stable operation of subsequent equipment and ensures that the particulate matters in the waste gas reach the standard and are discharged. The oxidation furnace fully burns the organic waste gas to decompose the organic waste gas. The washing tower removes acid gas contained in the burned flue gas. The chimney is used for discharging the treated organic waste gas.
Preferably, the dust remover is a dry mechanical dust remover, a wet dust remover, a particle layer dust remover, a bag type dust remover or an electric dust remover. The dust remover can be respectively used for treating different types of particles and can be selected according to actual requirements.
More preferably, the organic contaminated soil remediation system further comprises a second fan, and the oxidation furnace and the scrubber are communicated through the second fan. The second fan is used for introducing the organic waste gas output by the oxidation furnace into the washing tower.
The invention provides a method for restoring organic contaminated soil, which comprises the following steps:
a) burning the fuel gas to obtain first combustion flue gas; indirectly heating the organic contaminated soil by the first combustion flue gas to obtain first soil, first flue gas and organic waste gas;
b) carrying out heat exchange treatment on the first soil and the first flue gas obtained in the step a) and first cold air to obtain heated first cold air, restored soil and heat-exchanged first flue gas;
c) carrying out heat exchange treatment on the organic waste gas obtained in the step a) and second cold air to obtain heated second cold air and heat-exchanged organic waste gas;
d) burning the heated first cold air obtained in the step b), the heated second cold air obtained in the step c) and the fuel gas obtained in the step a) to obtain second combustion flue gas, and indirectly heating the organic contaminated soil by the second combustion flue gas to obtain first soil, first flue gas and organic waste gas.
According to the organic contaminated soil remediation method, the first soil and the first flue gas obtained in the step a) are subjected to heat exchange treatment with first cold air, so that heat in the first soil and the first flue gas is recovered, the generated waste heat is fully utilized, and the energy consumption is reduced; carrying out heat exchange treatment on the organic waste gas obtained in the step a) and second cold air, and recovering heat in the organic waste gas obtained in the step a), so that the generated waste heat is fully utilized, and the energy consumption is reduced; the organic contaminated soil is indirectly heated by the first combustion flue gas, and organic waste gas volatilized from the organic contaminated soil is not contacted with the first combustion flue gas and directly enters subsequent treatment, so that the waste gas treatment amount is reduced, and the equipment investment cost is reduced.
Preferably, in the step c), the organic waste gas obtained in the step a) is subjected to heat exchange treatment with second cold air to obtain organic liquid. The organic liquid and the organic waste gas after heat exchange are output in a split phase manner, so that the subsequent treatment of the organic waste gas after subsequent heat exchange is facilitated.
Preferably, in the step d), the heated first cold air obtained in the step b) and the heated second cold air obtained in the step c) generate wind pressure and then are combusted with the fuel gas obtained in the step a), so as to obtain second combustion flue gas. For the transport of the heated first cool air and the heated second cool air, a wind pressure may be generated thereto by a fan.
Preferably, the organic contaminated soil remediation method further comprises: and c) carrying out dust removal, oxidative decomposition and washing on the heat-exchanged organic waste gas obtained in the step c), and then discharging. The purposes of dust removal, oxidative decomposition and discharge after washing are as follows: further processing the heat-exchanged organic waste gas obtained in the step c), wherein the processed organic waste gas can be directly discharged, so that secondary pollution is avoided.
More preferably, the oxidative decomposition is followed by a second fan followed by washing. The second fan generates wind pressure for conveying the organic waste gas after oxidative decomposition and then carries out subsequent treatment, namely washing.
More preferably, the temperature of the organic waste gas obtained in the step c) after heat exchange is 160-180 ℃. The dust removal device is beneficial to subsequent dust removal, ensures the dust removal effect and prevents high temperature from damaging the dust removal device.
More preferably, the concentration of the particulate matters in the organic waste gas after dust removal is reduced to 10mg/m3The following. Ensuring the long-term stable operation of the subsequent oxidative decomposition and washing and ensuring the final emission of the particles in the exhaust gas to reach the standard.
More preferably, the oxidative decomposition temperature is from 760 ℃ to 850 ℃. The temperature is favorable for fully decomposing the organic waste gas within the numerical range, partial organic matters can not be decomposed or can not be decomposed thoroughly due to too low temperature, the energy consumption is increased due to too high temperature, the equipment is easy to damage, and the cost is increased due to the need of matching with equipment with better high-temperature resistance.
More preferably, the temperature of the organic waste gas after oxidative decomposition is 100 to 150 ℃. The temperature of the organic waste gas after oxidative decomposition is lower than 100 ℃, the requirement on the heat recovery efficiency of the heat accumulating type oxidation furnace is high, the investment cost of the heat accumulating type oxidation furnace is greatly increased, the temperature of the organic waste gas after oxidative decomposition is higher than 150 ℃, the heat recovery rate of organic matters contained in the organic waste gas generated by combustion in the heat accumulating type oxidation furnace is low, and energy waste is caused.
More preferably, the temperature of the organic waste gas after washing is 50 ℃ to 80 ℃.
The technical scheme has the following beneficial effects:
(1) the first heat exchanger is used for recovering heat in the heated soil, the second heat exchanger is used for recovering heat contained in the organic waste gas, the generated waste heat is fully utilized, and the energy consumption is reduced.
(2) In the indirect heating rotary kiln, the flue gas that the combustion chamber produced indirectly heats organic contaminated soil, volatilize organic waste gas in the organic contaminated soil not with the flue gas contact that the combustion chamber produced, directly get into subsequent processing equipment to reduce waste gas treatment capacity, reduce equipment investment cost.
(3) A dust remover is added to ensure that the concentration of the particulate matters in the organic waste gas after dust removal is reduced to 10mg/m3And the long-term stable operation of the subsequent oxidation furnace and the washing tower is ensured, and the final emission of the particulate matters in the waste gas is ensured to reach the standard.
(4) The oxidation furnace can be used for fully oxidizing and decomposing the organic waste gas, and simultaneously, the heat provided by the oxidative decomposition of the organic matters in the waste gas can maintain the heat balance, thereby reducing the energy consumption.
(5) The washing tower is used for removing acid gas contained in the flue gas after oxidative decomposition.
Drawings
Fig. 1 is a schematic view of an organic contaminated soil remediation system according to an embodiment of the present invention.
Fig. 2 is a schematic view of the organic contaminated soil remediation system according to a preferred embodiment of the present invention.
Fig. 3 is a schematic view of a system for remediating organically-contaminated soil according to another embodiment of the present invention.
Reference numerals
10 combustion chamber
11 combustion flue gas outlet
12 gas inlet
13 air inlet
20 indirect heating rotary kiln
211 flue gas inlet
212 flue gas outlet
221 soil inlet
222 soil outlet
23 organic waste gas outlet
30 first heat exchanger
311 first air inlet
312 first air outlet
321 first heat exchanger soil inlet
322 first heat exchanger soil outlet
331 first heat exchanger flue gas inlet
332 first heat exchanger flue gas outlet
40 second heat exchanger
411 second air inlet
412 second air outlet
42 liquid outlet
50 first fan
60 buffer tank
70 dust remover
80 oxidation furnace
90 washing tower
100 chimney
110 second fan
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
As shown in fig. 1, a first aspect of the present invention exemplarily provides an organic contaminated soil remediation system, which includes a combustion chamber 10, an indirect heating rotary kiln 20, a first heat exchanger 30 and a second heat exchanger 40, wherein the combustion chamber 10 is provided with a combustion flue gas outlet 11, the indirect heating rotary kiln 20 is provided with a flue gas inlet 211, a flue gas outlet 212, a soil inlet 221, a soil outlet 222 and an organic waste gas outlet 23, the first heat exchanger 30 is provided with a first air inlet 311 and a first air outlet 312, the second heat exchanger 40 is provided with a second air inlet 411 and a second air outlet 412, the combustion chamber flue gas outlet 11 is communicated with the flue gas inlet 211, the flue gas outlet 212 and the soil outlet 222 are respectively communicated with the first heat exchanger 30, the organic waste gas outlet 23 is communicated with the second heat exchanger 40, and the first air outlet 312 and the second air outlet 412 are communicated with the combustion chamber 10.
The indirect heating rotary kiln 20 has a double-layer structure, and may include an inner container and an outer shell, with a cavity being provided between the inner container and the outer shell, thereby forming an interlayer. Organic contaminated soil lets in the inner bag as the cold source, and the flue gas that the combustion chamber 10 produced lets in the intermediate layer as the heat source, and the flue gas indirect heating organic contaminated soil that the combustion chamber 10 produced, the organic waste gas that volatilizees in the organic contaminated soil does not contact with the flue gas that the combustion chamber 10 produced, directly gets into subsequent processing equipment to reduce exhaust-gas treatment volume, reduce equipment investment cost.
In the organic contaminated soil remediation system, the first heat exchanger 30 is used for recovering the heat of the soil and the flue gas output from the indirect heating rotary kiln 20, the recovered heat is used for heating the first cold air input from the first air inlet 311, the generated waste heat is fully utilized, and the energy consumption is reduced; the second heat exchanger 40 is used for recovering heat of the organic waste gas output from the indirect heating rotary kiln 20, and the recovered heat is used for heating the second cold air input from the second air inlet 411, so that the generated waste heat is fully utilized, and the energy consumption is reduced; the flue gas from combustion chamber 10 output passes through indirect heating rotary kiln indirect heating organic contaminated soil, and the organic waste gas that volatilizees in the organic contaminated soil does not contact with the flue gas from combustion chamber 10 output, directly gets into subsequent processing equipment to reduce waste gas treatment capacity, reduce equipment investment cost.
When the organic contaminated soil remediation system of the embodiment is used, fuel gas is introduced into the combustion chamber 10 to be combusted, so that combustion flue gas is obtained; the combustion flue gas is introduced into the indirect heating rotary kiln 20 through the flue gas inlet 211, the organic contaminated soil is introduced into the indirect heating rotary kiln 20 through the soil inlet 221, and the organic contaminated soil is indirectly heated in the indirect heating rotary kiln 20 through the combustion flue gas; the organic waste gas output from the indirect heating rotary kiln 20 is output through the organic waste gas outlet 23 and then introduced into the second heat exchanger 40, and exchanges heat with second cold air introduced into the second heat exchanger 40 through the second air inlet 411, the organic waste gas after heat exchange can be discharged after subsequent treatment, and the second cold air after heat exchange is output through the second air outlet 412 and then introduced into the combustion chamber 10; the flue gas output from the indirect heating rotary kiln 20 is introduced into the first heat exchanger 30 through the first heat exchanger flue gas inlet 331, the soil output from the indirect heating rotary kiln 20 is output through the soil outlet 222 and then introduced into the first heat exchanger 30, the heat exchange is carried out between the soil and the first cold air introduced into the first heat exchanger 30 through the first air inlet 311, the flue gas after the heat exchange is discharged, the soil after the heat exchange is the restored soil, and the first cold air after the heat exchange is output through the first air outlet 312 and then introduced into the combustion chamber 10.
The first heat exchanger 30 may include an inner container, and an outer shell, a space is provided between the inner container and the inner shell to form a first interlayer, a space is provided between the inner shell and the outer shell to form a second interlayer, soil output from the indirect heating rotary kiln 20 is introduced into the inner container as a heat source, flue gas output from the indirect heating rotary kiln 20 is introduced into the second interlayer as a heat source, and first cold air is introduced into the first interlayer from the first air inlet 311 as a cold source. In the first heat exchanger 30, the flue gas output from the indirect heating rotary kiln 20, the first cool air input from the first air inlet 311, and the soil output from the indirect heating rotary kiln 20 are not in direct contact with each other, so that secondary dust raising is avoided.
The combustion chamber 10 is provided with a gas inlet 12 and an air inlet 13, and the first air outlet 312 and the second air outlet 412 are communicated with the air inlet 13. The gas inlet 12 is used for introducing gas to be combusted in the combustion chamber 10, and the gas can be natural gas, liquefied petroleum gas, artificial gas and the like. The air inlet 13 is used for introducing air combusted in the combustion chamber 10, that is, fuel gas, the first cold air after heat exchange and the second cold air after heat exchange are introduced into the combustion chamber 10.
The first heat exchanger 30 is further provided with a first heat exchanger soil inlet 321 and a first heat exchanger flue gas inlet 331, the flue gas outlet 212 is communicated with the first heat exchanger flue gas inlet 331, and the soil outlet 222 is communicated with the first heat exchanger soil inlet 321. The first heat exchanger soil inlet 321 is used to input soil output from the indirect heating rotary kiln 20. The first heat exchanger flue gas inlet 331 is used to input flue gas output from the indirect heating rotary kiln 20.
The first heat exchanger 30 is further provided with a first heat exchanger soil outlet 322 and a first heat exchanger flue gas outlet 332. The first heat exchanger soil outlet 322 is used for outputting the remediated soil. The first heat exchanger flue gas outlet 332 is used for outputting flue gas.
In a preferred embodiment, as shown in fig. 2, the second heat exchanger 40 may also be provided with a liquid outlet 42, and the organic liquid produced by the second heat exchanger is output from the liquid outlet 42. The second heat exchanger 40 may be a dividing wall type heat exchanger, such as a shell-and-tube type heat exchanger, and if the organic waste gas output from the indirect heating rotary kiln 20 is introduced into the tube side, a liquid outlet and a gas outlet are provided on the tube side, a small amount of condensed organic liquid generated after heat exchange is output from the liquid outlet, and the organic waste gas after heat exchange is output from the gas outlet.
In a preferred embodiment, the organic contaminated soil remediation system may further include a buffer tank 60, and the liquid outlet 42 is in communication with the buffer tank 60. The amount of the organic liquid after heat exchange is small, and the organic liquid is accumulated to a certain amount in the buffer tank 60 and then output.
In a preferred embodiment, the organic contaminated soil remediation system further includes a first fan 50, and the first air outlet 312 and the second air outlet 412 are in communication with the combustion chamber 10 via the first fan 50. The first fan 50 is used to introduce the first air output from the first heat exchanger 30 and the second air output from the second heat exchanger 40 into the combustion chamber 10.
In a preferred embodiment, the organic contaminated soil remediation system may further include a dust collector 70, an oxidation furnace 80, a scrubber 90, and a stack 100, and the second heat exchanger 40 is in communication with the dust collector 70, the oxidation furnace 80, the scrubber 90, and the stack 100, in that order. The dust remover 70, the oxidation furnace 80, the washing tower 90 and the chimney 100 are used for further processing the organic waste gas output from the indirect heating rotary kiln after heat exchange, and the processed organic waste gas can be directly discharged to avoid secondary pollution. The dust collector 70 ensures the long-term stable operation of subsequent equipment and ensures that the particulate matters in the waste gas reach the standard and are discharged. The oxidation furnace 80 sufficiently oxidizes the organic waste gas to decompose, such as a regenerative oxidation furnace. The scrubber 90 removes acidic gases, such as hydrogen chloride, sulfur dioxide, etc., contained in the flue gas after oxidative decomposition. The stack 100 is used to discharge the treated organic waste gas.
In a preferred embodiment, the dust separator is a dry mechanical dust separator, a wet dust separator, a particle layer dust separator, a bag dust separator or an electric dust separator.
The dust remover can be respectively used for treating different types of particles and can be selected according to actual requirements. The method comprises the following specific steps:
a dry mechanical dust remover mainly refers to dust removing equipment designed by applying the inertia action and the gravity action of dust, and is mainly used for separating or concentrating dust with high-concentration coarse particle diameter.
Wet dust collectors, such as spray towers, scrubbers, impact dust collectors, venturis and the like, rely on water power to separate and collect dust particles, and are used in many occasions for treating high-concentration and large-air-volume dust-containing gas generated in the production process. The separation efficiency for coarser, hydrophilic dust is higher than that of a dry mechanical dust collector.
The granular layer dust remover uses granular material accumulation layers with different granularities as filtering materials to block and filter dust. The dust-containing flue gas with high concentration, coarse particles and higher temperature is generally filtered.
The filter is a dust removal device taking a fiber woven fabric or a filling layer as a filter medium, is mainly used in places for trapping fine dust, and is applied to an exhaust dust removal system and an air intake system. The bag type dust collector can be a pulse bag type dust collector, has stable and reliable performance, strong adaptability to load change, high purification efficiency and high dust collection efficiency.
The electric dust collector introduces dust-containing airflow into an electrostatic field, the gas is ionized under the action of a high-voltage electric field, and when dust particles flow through a working electric field, negative charges are removed to a settling polar plate with the sign opposite to that of the negative charges at a certain speed, settled and collected in the electric dust collector. The electric dust remover has high dust removal efficiency, low resistance and convenient maintenance and management.
In a preferred embodiment, the organic contaminated soil remediation system may further include a second fan 110, and the oxidation furnace 80 and the scrubber 90 are in communication via the second fan 110. The second fan 110 is used to introduce the organic offgas outputted from the oxidation furnace 80 into the scrubber 90.
As shown in fig. 3, another embodiment of the present invention provides a preferred organic contaminated soil remediation system, which includes a combustion chamber 10, an indirect heating rotary kiln 20, a first heat exchanger 30, a second heat exchanger 40, a first fan 50, a buffer tank 60, a dust collector 70, an oxidation furnace 80, a washing tower 90, a chimney 100 and a second fan 110, wherein the combustion chamber 10 is provided with a combustion flue gas outlet 11, the indirect heating rotary kiln 20 is provided with a flue gas inlet 211, a flue gas outlet 212, a soil inlet 221, a soil outlet 222 and an organic waste gas outlet 23, the first heat exchanger 30 is provided with a first heat exchanger soil inlet 321, a first heat exchanger soil outlet 322, a first heat exchanger flue gas inlet 331, a first heat exchanger flue gas outlet 332, a first air inlet 311 and a first air outlet 312, the second heat exchanger 40 is provided with a second air inlet 411 and a second air outlet 412, the second heat exchanger 40 is further provided with a liquid outlet 42, the organic contaminated soil remediation system further comprises a buffer tank 60, the liquid outlet 42 is communicated with the buffer tank 60, and the organic liquid generated by the second heat exchanger is output from the liquid outlet 42 and then flows to the buffer tank 60. The combustion chamber 10 is provided with a fuel gas inlet 12 and an air inlet 13, a combustion chamber flue gas outlet 11 is communicated with a flue gas inlet 211, a flue gas outlet 212 is communicated with a first heat exchanger flue gas inlet 331, a soil outlet 222 is communicated with a first heat exchanger soil inlet 321, an organic waste gas outlet 23 is communicated with a second heat exchanger 40, the second heat exchanger 40 is sequentially communicated with a dust remover 70, an oxidation furnace 80, a second fan 110, a washing tower 90 and a chimney 100, the dust remover 70 is a pulse bag-type dust remover, and the first air outlet 312 and the second air outlet 412 are communicated with the air inlet 13 of the combustion chamber 10 through a first fan 50.
When the preferred organic contaminated soil remediation system is used, fuel gas is introduced into the combustion chamber 10 through the fuel gas inlet 12 to be combusted, so that combustion flue gas is obtained; the combustion flue gas is introduced into the indirect heating rotary kiln 20 through the flue gas inlet 211, and the organic contaminated soil is introduced into the indirect heating rotary kiln 20 through the soil inlet 221 and is indirectly heated in the indirect heating rotary kiln 20 through the combustion flue gas; the organic waste gas output from the indirect heating rotary kiln 20 is output through the organic waste gas outlet 23 and then introduced into the second heat exchanger 40, the organic waste gas exchanges heat with second cold air introduced into the second heat exchanger 40 through the second air inlet 411, the organic waste gas after heat exchange is discharged after being sequentially treated by the dust remover 70, the oxidation furnace 80, the second fan 110, the washing tower 90 and the chimney 100, and the second cold air after heat exchange is output through the second air outlet 412; the flue gas output from the indirect heating rotary kiln 20 is introduced into the first heat exchanger 30 through a first heat exchanger flue gas inlet 331, the soil output from the indirect heating rotary kiln 20 is introduced into the first heat exchanger 30 through a first heat exchanger soil inlet 321, and exchanges heat with the first cold air introduced into the first heat exchanger 30 through a first air inlet 311, the flue gas after heat exchange is output through a first heat exchanger flue gas outlet 332, the soil after heat exchange is remediation soil and is output through a first heat exchanger soil outlet 322, and the first cold air after heat exchange is output through a first air outlet 312; the heat-exchanged first cool air outputted through the first air outlet 312 and the heat-exchanged second cool air outputted through the second air outlet 412 are sequentially introduced into the combustion chamber 10 through the first fan 50 and the air inlet 13.
The invention provides a method for restoring organic contaminated soil, which comprises the following steps:
a) burning the fuel gas to obtain first combustion flue gas; indirectly heating the organic contaminated soil by using first combustion flue gas to obtain first soil, first flue gas and organic waste gas;
b) carrying out heat exchange treatment on the first soil and the first flue gas obtained in the step a) and first cold air to obtain heated first cold air, restored soil and heat-exchanged first flue gas;
c) carrying out heat exchange treatment on the organic waste gas obtained in the step a) and second cold air to obtain heated second cold air and heat-exchanged organic waste gas;
d) burning the heated first cold air obtained in the step b), the heated second cold air obtained in the step c) and the fuel gas obtained in the step a) to obtain second combustion flue gas, and indirectly heating the organic contaminated soil by the second combustion flue gas to obtain first soil, first flue gas and organic waste gas.
The fuel gas can be natural gas, liquefied petroleum gas, artificial gas, etc.
According to the organic contaminated soil remediation method, the first soil and the first flue gas obtained in the step a) are subjected to heat exchange treatment with first cold air, so that heat in the first soil and the first flue gas is recovered, the generated waste heat is fully utilized, and the energy consumption is reduced; carrying out heat exchange treatment on the organic waste gas obtained in the step a) and second cold air, and recovering heat in the organic waste gas obtained in the step a), so that the generated waste heat is fully utilized, and the energy consumption is reduced; the organic contaminated soil is indirectly heated by the first combustion flue gas, and organic waste gas volatilized from the organic contaminated soil is not contacted with the first combustion flue gas and directly enters subsequent treatment, so that the waste gas treatment amount is reduced, and the equipment investment cost is reduced.
In a preferred embodiment, in the step c), the organic waste gas obtained in the step a) is subjected to heat exchange treatment with the second cold air to obtain organic liquid. The organic liquid and the organic waste gas after heat exchange are output in a split phase manner, so that the subsequent treatment of the organic waste gas after subsequent heat exchange is facilitated.
In a preferred embodiment, in step d), the heated first cold air obtained in step b) and the heated second cold air obtained in step c) generate wind pressure, and then are combusted with the fuel gas obtained in step a) to obtain second combustion flue gas. For the transport of the heated first cool air and the heated second cool air, a wind pressure may be generated thereto by a fan.
In a preferred embodiment, the method for remediating organically-contaminated soil further comprises: and c) carrying out dust removal, oxidative decomposition and washing on the heat-exchanged organic waste gas obtained in the step c), and then discharging. The purposes of dust removal, oxidative decomposition and discharge after washing are as follows: further processing the heat-exchanged organic waste gas obtained in the step c), wherein the processed organic waste gas can be directly discharged, so that secondary pollution is avoided.
In a preferred embodiment, the oxidative decomposition is followed by a second fan followed by a further washing. The second fan generates wind pressure for conveying the organic waste gas after oxidative decomposition and then carries out subsequent treatment, namely washing.
In a preferred embodiment, the temperature of the heat-exchanged organic waste gas obtained in step c) is 160 ℃ to 180 ℃, such as 160 ℃ to 170 ℃ or 170 ℃ to 180 ℃. The dust removal device is beneficial to subsequent dust removal, ensures the dust removal effect and prevents high temperature from damaging the dust removal device. The organic waste gas temperature is more than 180 ℃, the requirement on the heat resistance of a dust remover (such as a filter bag of a bag-type dust remover) is high, the price is high, the cost is high, and the lower temperature is favorable for recovering heat. The temperature of the organic waste gas is lower than 160 ℃, which is close to the acid dew point of the organic waste gas, so that the organic waste gas is easy to corrode equipment, and the bag-pasting of the bag-type dust remover can be caused.
In a preferred embodiment, the concentration of particulate matter in the organic waste gas after dust removal is reduced to 10mg/m3The following. Ensuring the long-term stable operation of the subsequent oxidative decomposition and washing and ensuring the final emission of the particles in the exhaust gas to reach the standard.
In a preferred embodiment, the oxidative decomposition temperature is from 760 ℃ to 850 ℃, such as from 760 ℃ to 800 ℃ or from 800 ℃ to 850 ℃. The temperature is favorable for fully decomposing the organic waste gas within the numerical range, partial organic matters can not be decomposed or can not be decomposed thoroughly due to too low temperature, the energy consumption is increased due to too high temperature, the equipment is easy to damage, and the cost is increased due to the need of matching with equipment with better high-temperature resistance. The temperature of the organic waste gas after oxidative decomposition is 100-150 ℃, such as 100-120 ℃ or 120-150 ℃. The temperature of the organic waste gas after oxidative decomposition is lower than 100 ℃, the requirement on the heat recovery efficiency of the regenerative oxidation furnace is high, and the investment cost of the regenerative oxidation furnace is greatly increased. The temperature of the organic waste gas after oxidative decomposition is higher than 150 ℃, and the heat recovery rate of the organic matters contained in the organic waste gas generated by combustion in the regenerative oxidation furnace is low, thereby causing energy waste.
The temperature of the organic waste gas after washing is usually 50-80 ℃, such as 50-60 ℃ or 60-80 ℃.
Example 1
The embodiment provides an organic contaminated soil remediation method, which uses the organic contaminated soil remediation system shown in fig. 3, and comprises the following steps:
a) burning the fuel gas to obtain first combustion flue gas; indirectly heating the organic contaminated soil by using first combustion flue gas to obtain first soil, first flue gas and organic waste gas;
b) carrying out heat exchange treatment on the first soil and the first flue gas obtained in the step a) and first cold air to obtain heated first cold air, restored soil and heat-exchanged first flue gas; the repaired soil reaches the GB36600-2018 standard;
c) carrying out heat exchange treatment on the organic waste gas obtained in the step a) and second cold air to obtain heated second cold air, organic waste gas after heat exchange and organic liquid; the temperature of the organic waste gas after heat exchange is 160 ℃;
d) the heated first cold air obtained in the step b) and the heated second cold air obtained in the step c) generate wind pressure and then are combusted with the fuel gas obtained in the step a) to obtain second combustion flue gas, and the organic polluted soil is indirectly heated by the second combustion flue gas to obtain first soil, first flue gas and organic waste gas;
e) dedusting and oxidizing decomposition are carried out on the heat-exchanged organic waste gas obtained in the step c), and the organic waste gas is washed by a second fan after the oxidizing decomposition and then is discharged; the concentration of the particulate matters in the organic waste gas after dust removal is reduced to 10mg/m3The following; the oxidative decomposition temperature is 760 ℃; the temperature of the organic waste gas after oxidative decomposition is 120 ℃; the temperature of the organic waste gas after washing is 80 ℃, the organic waste gas is directly discharged from a chimney, and the organic waste gas after treatment reaches the emission standard of GB16297-1996 Integrated emission Standard of atmospheric pollutants.
Example 2
The embodiment provides an organic contaminated soil remediation method, which uses the organic contaminated soil remediation system shown in fig. 3, and comprises the following steps:
a) burning the fuel gas to obtain first combustion flue gas; indirectly heating the organic contaminated soil by using first combustion flue gas to obtain first soil, first flue gas and organic waste gas;
b) carrying out heat exchange treatment on the first soil and the first flue gas obtained in the step a) and first cold air to obtain heated first cold air, restored soil and heat-exchanged first flue gas; the repaired soil reaches the GB36600-2018 standard;
c) carrying out heat exchange treatment on the organic waste gas obtained in the step a) and second cold air to obtain heated second cold air, organic waste gas after heat exchange and organic liquid; the temperature of the organic waste gas after heat exchange is 170 ℃;
d) the heated first cold air obtained in the step b) and the heated second cold air obtained in the step c) generate wind pressure and then are combusted with the fuel gas obtained in the step a) to obtain second combustion flue gas, and the organic polluted soil is indirectly heated by the second combustion flue gas to obtain first soil, first flue gas and organic waste gas;
e) dedusting and oxidizing decomposition are carried out on the heat-exchanged organic waste gas obtained in the step c), and the organic waste gas is washed by a second fan after the oxidizing decomposition and then is discharged; reducing the concentration of particulate matter in the organic waste gas after dust removalAs low as 10mg/m3The following; the oxidative decomposition temperature is 800 ℃; the temperature of the organic waste gas after oxidative decomposition is 100 ℃; the temperature of the organic waste gas after washing is 50 ℃, the organic waste gas is directly discharged from a chimney, and the organic waste gas after treatment reaches the emission standard of GB16297-1996 Integrated emission Standard of atmospheric pollutants.
Example 3
The embodiment provides an organic contaminated soil remediation method, which uses the organic contaminated soil remediation system shown in fig. 3, and comprises the following steps:
a) burning the fuel gas to obtain first combustion flue gas; indirectly heating the organic contaminated soil by using first combustion flue gas to obtain first soil, first flue gas and organic waste gas;
b) carrying out heat exchange treatment on the first soil and the first flue gas obtained in the step a) and first cold air to obtain heated first cold air, restored soil and heat-exchanged first flue gas; the repaired soil reaches the GB36600-2018 standard;
c) carrying out heat exchange treatment on the organic waste gas obtained in the step a) and second cold air to obtain heated second cold air, organic waste gas after heat exchange and organic liquid; the temperature of the organic waste gas after heat exchange is 180 ℃;
d) the heated first cold air obtained in the step b) and the heated second cold air obtained in the step c) generate wind pressure and then are combusted with the fuel gas obtained in the step a) to obtain second combustion flue gas, and the organic polluted soil is indirectly heated by the second combustion flue gas to obtain first soil, first flue gas and organic waste gas;
e) dedusting and oxidizing decomposition are carried out on the heat-exchanged organic waste gas obtained in the step c), and the organic waste gas is washed by a second fan after the oxidizing decomposition and then is discharged; the concentration of the particulate matters in the organic waste gas after dust removal is reduced to 10mg/m3The following; the oxidative decomposition temperature is 850 ℃; the temperature of the organic waste gas after oxidative decomposition is 150 ℃; the temperature of the organic waste gas after washing is 60 ℃, the organic waste gas is directly discharged from a chimney, and the organic waste gas after treatment reaches the emission standard of GB16297-1996 Integrated emission Standard of atmospheric pollutants.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The organic contaminated soil remediation system is characterized by comprising a combustion chamber (10), an indirect heating rotary kiln (20), a first heat exchanger (30) and a second heat exchanger (40), wherein the combustion chamber (10) is provided with a combustion flue gas outlet (11), the indirect heating rotary kiln (20) is provided with a flue gas inlet (211), a flue gas outlet (212), a soil inlet (221), a soil outlet (222) and an organic waste gas outlet (23), the first heat exchanger (30) is provided with a first air inlet (311) and a first air outlet (312), the second heat exchanger (40) is provided with a second air inlet (411) and a second air outlet (412), the combustion chamber flue gas outlet (11) is communicated with the flue gas inlet (211), the flue gas outlet (212) and the soil outlet (222) are respectively communicated with the first heat exchanger (30), the organic waste gas outlet (23) is communicated with the second heat exchanger (40), and the first air outlet (312) and the second air outlet (412) are communicated with the combustion chamber (10).
2. The organically-polluted soil remediation system of claim 1 further comprising at least one of the following technical features:
1) the combustion chamber (10) is provided with a gas inlet (12) and an air inlet (13), and the first air outlet (312) and the second air outlet (412) are communicated with the air inlet (13);
2) the first heat exchanger (30) is also provided with a first heat exchanger soil inlet (321) and a first heat exchanger flue gas inlet (331), the flue gas outlet (212) is communicated with the first heat exchanger flue gas inlet (331), and the soil outlet (222) is communicated with the first heat exchanger soil inlet (321);
3) the first heat exchanger (30) is also provided with a first heat exchanger soil outlet (322) and a first heat exchanger flue gas outlet (332);
4) the second heat exchanger (40) is also provided with a liquid outlet (42), and the organic liquid generated by the second heat exchanger is output from the liquid outlet (42);
5) further comprising a first fan (50), the first air outlet (312), the second air outlet (412) being in communication with the combustion chamber (10) via the first fan (50).
3. The organically-polluted soil remediation system as claimed in claim 2 wherein, in feature 4), the organically-polluted soil remediation system further comprises a buffer tank (60), the liquid outlet (42) being in communication with the buffer tank (60).
4. The organically-polluted soil remediation system of claim 1 further comprising a dust collector (70), an oxidation oven (80), a scrubber (90), and a stack (100), the second heat exchanger (40) being in communication with the dust collector (70), the oxidation oven (80), the scrubber (90), and the stack (100) in that order.
5. The organically-polluted soil remediation system of claim 4 wherein the dust collector (70) is a dry mechanical dust collector, a wet dust collector, a granular layer dust collector, a bag dust collector, or an electric dust collector.
6. The organically-polluted soil remediation system of claim 4 further comprising a second fan (110), said oxidation furnace (80) and said scrubber tower (90) being in communication via said second fan (110).
7. The method for restoring the organic contaminated soil is characterized by comprising the following steps:
a) burning the fuel gas to obtain first combustion flue gas; indirectly heating the organic contaminated soil by the first combustion flue gas to obtain first soil, first flue gas and organic waste gas;
b) carrying out heat exchange treatment on the first soil and the first flue gas obtained in the step a) and first cold air to obtain heated first cold air, restored soil and heat-exchanged first flue gas;
c) carrying out heat exchange treatment on the organic waste gas obtained in the step a) and second cold air to obtain heated second cold air and heat-exchanged organic waste gas;
d) burning the heated first cold air obtained in the step b), the heated second cold air obtained in the step c) and the fuel gas obtained in the step a) to obtain second combustion flue gas, and indirectly heating the organic contaminated soil by the second combustion flue gas to obtain first soil, first flue gas and organic waste gas.
8. The method for remediating organically-polluted soil as claimed in claim 7, further comprising at least one of the following technical features:
1) in the step c), organic waste gas obtained in the step a) and second cold air are subjected to heat exchange treatment to obtain organic liquid;
2) in the step d), the heated first cold air obtained in the step b) and the heated second cold air obtained in the step c) generate wind pressure and then are combusted with the fuel gas obtained in the step a), and second combustion flue gas is obtained.
9. The method for remediating organically-polluted soil as claimed in claim 7, further comprising: and c) carrying out dust removal, oxidative decomposition and washing on the heat-exchanged organic waste gas obtained in the step c), and then discharging.
10. The method for remediating organically-polluted soil as claimed in claim 9, further comprising at least one of the following technical features:
1) washing by a second fan after oxidative decomposition;
2) the temperature of the organic waste gas after heat exchange obtained in the step c) is 160-180 ℃;
3) the concentration of the particulate matters in the organic waste gas after dust removal is reduced to 10mg/m3The following;
4) the oxidative decomposition temperature is 760 ℃ to 850 ℃;
5) the temperature of the organic waste gas after oxidative decomposition is 100-150 ℃;
6) the temperature of the organic waste gas after washing is 50-80 ℃.
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