CN214456893U - Device for removing TOC (total organic carbon) in industrial solid waste salt - Google Patents
Device for removing TOC (total organic carbon) in industrial solid waste salt Download PDFInfo
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Abstract
The utility model discloses a device of desorption industry solid waste salt TOC belongs to industry solid waste salt resourceization technical field. The utility model discloses the device is including consecutive feeding device, dewatering device, catalytic oxidation device, cooling discharging device, catalytic oxidation device and dewatering device both way junction, hot-blast apparatus and catalytic oxidation device link to each other. Sequentially feeding industrial solid waste salt into a feeding device, a dehydrating device, a catalytic oxidation device and a cooling and discharging device to finally obtain low TOC waste salt; the air is heated by the hot air device and then enters the catalytic oxidation device in a counter-current manner, and further enters the dehydration device in a counter-current manner, and finally enters the tail gas treatment device. The utility model discloses the device is favorable to falling the TOC of industry solid waste salt below 30mg kg, can also avoid solid waste salt melting, waste salt to bond scheduling problem on equipment surface simultaneously, ensures that the device can continuous steady operation.
Description
Technical Field
The utility model relates to a device of desorption industry solid waste salt TOC belongs to industry solid waste salt resourceization technical field.
Background
The industrial solid waste salt refers to solid waste salt recovered from high-concentration salt-containing organic wastewater in the industries of chemical industry, medicine, pesticide and the like. According to the records, the total amount of industrial solid waste salt in China in 2019 is up to more than 2000 million tons. Along with the development of economy and the improvement of industrialization level in China, the yield of solid waste salt also shows a rapid increase situation, wherein the chemical industry, the medicine industry and the pesticide industry are major households for generating the waste salt. The industrial waste salt has the characteristics of various sources, various types, complex components, high content of toxic and harmful substances, serious environmental hazard and the like, and if the industrial waste salt is directly discharged into the environment without being treated, the industrial waste salt not only harms the physical health of human beings, but also brings different degrees of pollution to soil and atmosphere and causes great damage to the ecological environment. At present, many enterprises can only be forced to treat the generated solid salt as hazardous waste, and the landfill disposal of the solid waste salt causes serious resource waste and secondary pollution risk of the ecological environment. Because many enterprises can not realize that dangerous waste is timely transferred and disposed, and the wastes are in an accumulation state all the year round, not only is a heavy economic burden brought to the enterprises, but also a lot of environmental protection and potential safety hazards are buried.
At present, because the corresponding salt standard after the industrial waste salt treatment and refining is not developed in China, a plurality of dangerous waste treatment companies only cure and bury the salt after organic matter removal, and the salt is not effectively utilized. Most industrial solid waste salts contain sodium chloride or sodium sulfate as the main component and also contain part of inorganic impurities and organic matters. The industrial solid waste salt is classified and comprehensively utilized as resources, so that the regeneration and cyclic utilization of industrial raw materials such as sodium chloride, sodium sulfate and the like can be realized, the landfill load of dangerous waste salt can be greatly reduced, the secondary pollution risk of the environment can be reduced, and the significance is very important.
In view of the fact that the refined sodium chloride and the sodium sulfate which are recycled as resources are mainly used in the industries of chlor-alkali, glass, paper making and the like, the use unit of the refined salt has strict requirements on the Total Organic Carbon (TOC) content in the recycled sodium chloride and sodium sulfate crystals. For sodium chloride for the chlor-alkali industry, although the TOC content is not specifically specified in the industry standard QB/T5270-2018, in order to protect ionic membrane equipment from organic matter pollution, chlor-alkali manufacturers generally require that the TOC content in refined sodium chloride is less than 30mg/kg, and the lower the TOC content, the better. Therefore, in order to realize the maximum recycling of the industrial solid waste salt, the organic pollutant TOC in the industrial solid waste salt must be removed firstly.
In the aspect of pretreatment of industrial solid waste salt, the following technologies are mainly available at present:
(1) the salt washing process comprises the following steps: the organic solvent is adopted to clean the industrial solid waste salt to remove the TOC, the method has simple process, but has potential safety hazard and is not approved by the industry and the management department because of the fire prevention and explosion prevention of the organic solvent; secondly, a small amount of organic solvent remains in the refined salt, which affects the subsequent use of the recovered salt product.
(2) High-temperature incineration: the high-temperature incineration can thoroughly decompose organic matters, heavy metals can be removed in the refining process, but solid waste salt is melted and agglomerated in the high-temperature process, so that the equipment cannot continuously and stably run.
(3) High-temperature carbonization: the organic gas is easy to generate the safety accidents of 'flash explosion' and the like in the high-temperature carbonization process, and simultaneously, the TOC in the solid waste salt is difficult to be effectively reduced to be below 30 mg/kg.
(4) Advanced oxidation: numerous experiments have shown that the end products of the higher oxidation are mostly carboxylic acids, so that the higher oxidation does not provide an effective TOC removal.
Therefore, there is a need to find a better apparatus for removing TOC from industrial solid waste salt.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a device of desorption industry solid waste salt TOC, the utility model discloses can not only effectively fall the TOC of industry solid waste salt below 30mg kg, can also avoid solid waste salt melting, waste salt to bond scheduling problem in equipment surface simultaneously, ensure that the device can continuous steady operation.
The utility model provides a device of desorption industry solid waste salt TOC, the device includes feeding device, dewatering device, catalytic oxidation device, cooling discharging device and hot air device, wherein, feeding device, dewatering device, catalytic oxidation device, cooling discharging device link to each other in proper order, hot air device and catalytic oxidation device link to each other, catalytic oxidation device and dewatering device both way junction.
In an embodiment of the present invention, the feeding device comprises a feeding port of the feeding device and a discharging port of the feeding device, the dehydrating device comprises a feeding port of the dehydrating device, a discharging port of the dehydrating device, an air inlet of the dehydrating device and an air outlet of the dehydrating device, the catalytic oxidation device comprises a first feeding port, a second feeding port, a discharging port of the catalytic oxidation device, an air inlet of the catalytic oxidation device and an air outlet of the catalytic oxidation device, the cooling discharging device comprises a feeding port of the cooling discharging device and a discharging port of the cooling discharging device, and the hot air device comprises an air outlet of the hot air device; the discharge port of the feeding device is connected with the feed port of the dehydrating device, the discharge port of the dehydrating device is connected with the second feed port of the catalytic oxidation device, the discharge port of the catalytic oxidation device and the gas outlet of the catalytic oxidation device are respectively connected with the feed port of the cooling discharge device and the gas inlet of the dehydrating device, and the gas inlet of the catalytic oxidation device is connected with the gas outlet of the hot air device.
The utility model discloses an in an embodiment, the device of desorption industry solid waste salt TOC still includes tail gas processing apparatus, tail gas processing apparatus with dewatering device's gas outlet links to each other.
In an embodiment of the present invention, the hot air device, the catalytic oxidation device, the dehydration device, and the tail gas treatment device are sequentially connected.
In an embodiment of the present invention, the feeding device, the dehydration device, the catalytic oxidation device, and the cooling and discharging device are sequentially connected.
In an embodiment of the present invention, the feeding device is a device capable of lifting and quantitatively and continuously conveying solid waste salt.
The utility model discloses an in an embodiment, feeding device including feed bin, lifting machine, the quantitative charging machine equipment that connects gradually.
The utility model discloses an in an embodiment, feeding device's function is promotion, ration, continuous transport solid waste salt, prevents dewatering system's tail gas to get into feeding system simultaneously.
In an embodiment of the present invention, the dewatering device is a device for removing moisture from the solid waste salt.
In an embodiment of the present invention, the dehydration device utilizes the high temperature tail gas from the catalytic oxidation device to heat the solid waste salt for removing the water content of the solid waste salt.
In one embodiment of the present invention, the operating temperature of the dehydration device is at 100 ℃ and 300 ℃, and the retention time is 5-30 minutes.
In an embodiment of the present invention, the catalytic oxidation reaction in the catalytic oxidation apparatus is performed to remove Total Organic Carbon (TOC) in the solid waste salt, specifically, the total organic carbon in the solid waste salt is removed by using the synergistic effect of the catalyst, the oxidant and the hot air.
In one embodiment of the present invention, the catalytic oxidation apparatus includes a rotary kiln, a grate furnace, and other reactors.
In one embodiment of the present invention, the operating temperature of the catalytic oxidation apparatus is 300-.
In one embodiment of the present invention, the catalyst is an alloy material, wherein the alloy material contains 70-80% of iron, 5-15% of chromium, 2-8% of molybdenum, and 1-7% of tungsten.
In one embodiment of the present invention, the catalyst is prepared into regular or irregular spherical particles with a diameter of 20-80mm, and the particles are placed in the catalytic oxidation system before the operation of the device.
In one embodiment of the present invention, the catalyst is prepared by high temperature smelting at 1000-.
In one embodiment of the present invention, the oxidant is one or a mixture of oxygen and ozone, and the addition amount is 0.01-0.2m3T solid waste salt.
In an embodiment of the present invention, the cooling and discharging device is used for cooling the solid waste salt after TOC removal with circulating cooling water.
In an embodiment of the present invention, the hot air device is a device for heating air.
In an embodiment of the present invention, the air temperature at the air outlet of the hot air device is 350-.
In one embodiment of the present invention, the heating heat source of the hot air device may be one or two of electricity, natural gas, liquefied petroleum gas, and the like; the heating means includes direct heating or indirect heating.
In one embodiment of the utility model, industrial solid waste salt enters a feeding device, a dehydration device, a catalytic oxidation device and a cooling and discharging device in sequence, and finally low TOC waste salt is obtained; the air is heated by the hot air device and then enters the catalytic oxidation device in a counter-current manner, and further enters the dehydration device in a counter-current manner, and finally enters the tail gas treatment device.
In an embodiment of the present invention, the device of the present invention operates in the following manner: the solid waste salt enters the feeding device from a feeding hole of the feeding device, a discharging hole of the feeding device is connected with a feeding hole of the dehydrating device, and the solid waste salt enters the dehydrating device through the feeding hole of the dehydrating device; the discharge hole of the dehydration device is connected with the second feed inlet of the catalytic oxidation device and is used for conveying the dehydrated solid waste salt to the catalytic oxidation device; the first feed inlet of the catalytic oxidation device is connected with an oxidant and used for conveying the oxidant; the discharge hole of the catalytic oxidation device is connected with the feed inlet of the cooling discharge device, the solid waste salt after the TOC removal through catalytic oxidation enters the cooling discharge device, and is discharged from the discharge hole of the cooling discharge device after being cooled; in addition, an air inlet of the catalytic oxidation device is connected with an air outlet of the hot air device, high-temperature hot air from a hot air system enters the catalytic oxidation device and heats the solid waste salt, and the hot air and the solid waste salt flow in a reverse direction in the catalytic oxidation device, so that the hot air is fully contacted with the solid waste salt to heat the solid waste salt better; the air outlet of the catalytic oxidation device is connected with the air inlet of the dehydration device, hot air after heating solid waste salt enters the dehydration device, the hot air from the catalytic oxidation device is used for heating the solid waste salt in the dehydration device and removing the moisture of the solid waste salt, and then the obtained low-temperature tail gas enters the tail gas treatment device through the air outlet of the dehydration device.
In an embodiment of the present invention, the industrial solid waste salt is waste generated in chemical, pharmaceutical, and pesticide industries, and the component thereof is mainly sodium sulfate or sodium chloride, and the organic matter is entrained by the waste salt, and the organic matter is one or more of raw materials, products, and byproducts that do not react completely in chemical, pharmaceutical, and pesticide industries, and is generally referred to as TOC.
The technical advantages of the utility model reside in that:
(1) the utility model discloses the device organic combines catalyst, oxidant and hot-air in catalytic oxidation device for the three can exert the synergism, organic pollutant in desorption industry solid waste salt that can be fine, with TOC desorption in the industry solid waste salt to below 30mg/kg, establish good basis for processes such as follow-up refined sodium chloride, sodium sulfate of retrieving.
(2) The utility model discloses device and conventional desorption organic matter's device are relatively, can utilize catalyst, oxidant and hot-air's synergism, reduce the temperature of organic matter among the decomposition industry solid waste salt, avoid because of the industry solid waste salt caking that high temperature arouses, glue phenomenons such as wall, melting, guarantee catalytic oxidation system equipment ability steady operation in succession, have also reduced the direct energy consumption that industry solid waste salt was handled.
(3) The utility model discloses the dewatering device who sets up, make full use of the heat in the tail gas that the catalytic oxidation system discharged, improved heat utilization rate, reduced the cost that industry solid waste salt was handled.
Drawings
FIG. 1 is a device for removing industrial solid waste salt TOC; the method comprises the following steps of 1-feeding port of a feeding device, 2-discharging port of a feeding device, 3-feeding port of a dewatering device, 4-discharging port of a dewatering device, 5-air inlet of a dewatering device, 6-air outlet of a dewatering device, 7-first feeding port of a catalytic oxidation device, 8-second feeding port of a catalytic oxidation device, 9-discharging port of a catalytic oxidation device, 10-air inlet of a catalytic oxidation device, 11-air outlet of a catalytic oxidation device, 12-feeding port of a cooling discharging device, 13-discharging port of a cooling discharging device and 14-air outlet of a hot air device.
Detailed Description
Method for determining TOC: non-dispersive infrared photometry.
The present invention will be further described with reference to the following examples, but the embodiments of the present invention are not limited thereto.
Example 1
A device for removing industrial solid waste salt TOC is shown in figure 1 and comprises a feeding device, a dehydration device, a catalytic oxidation device, a cooling discharging device and a hot air device, wherein the feeding device, the dehydration device, the catalytic oxidation device and the cooling discharging device are sequentially connected, the hot air device is connected with the catalytic oxidation device, and the catalytic oxidation device is bidirectionally connected with the dehydration device; the feeding device is a device capable of lifting, quantitatively and continuously conveying solid waste salt, the dehydrating device is a device for removing moisture in the solid waste salt, a catalytic oxidation reaction is carried out in the catalytic oxidation device to remove Total Organic Carbon (TOC) in the solid waste salt, the cooling and discharging device has the function of reducing the temperature of the solid waste salt after the TOC is removed by using circulating cooling water, and the hot air device is a device for heating air.
Specifically, the feeding device comprises a feeding hole 1 of the feeding device and a discharging hole 2 of the feeding device, the dewatering device comprises a feeding hole 3 of the dewatering device, a discharging hole 4 of the dewatering device, an air inlet 5 of the dewatering device and an air outlet 6 of the dewatering device, the catalytic oxidation device comprises a first feeding hole 7, a second feeding hole 8, a discharging hole 9 of the catalytic oxidation device, an air inlet 10 of the catalytic oxidation device and an air outlet 11 of the catalytic oxidation device, the cooling discharging device comprises a feeding hole 12 of the cooling discharging device and a discharging hole 13 of the cooling discharging device, the hot air device comprises an air outlet 14 of the hot air device, the feeding hole 2 of the feeding device is connected with the feeding hole 3 of the dewatering device, the discharging hole 4 of the dewatering device is connected with the second feeding hole 8 of the catalytic oxidation device, the discharging hole 9 of the catalytic oxidation device and the air outlet 11 of the catalytic oxidation device are respectively connected with the feeding hole 12 of the cooling discharging device, the air inlet 12 of the catalytic oxidation device, the air outlet 11 of the catalytic oxidation device, The air inlet 5 of the dehydration device is connected, the air inlet 10 of the catalytic oxidation device is connected with the air outlet 14 of the hot air device, and the air outlet 6 of the dehydration device is connected with the tail gas treatment device.
Further, the hot air device, the catalytic oxidation device, the dehydration device and the tail gas treatment device are communicated in sequence; the feeding device, the dehydration device, the catalytic oxidation device and the cooling and discharging device are communicated in sequence.
Furthermore, the feeding device comprises a storage bin, a lifting machine and quantitative feeder equipment which are connected in sequence.
Furthermore, the catalytic oxidation device comprises a rotary kiln, a chain grate furnace and other reactors.
The utility model discloses a device of desorption industry solid waste salt TOC passes through following theory of operation desorption TOC: solid waste salt enters the feeding device from a feeding hole 1 of the feeding device, a discharging hole 2 of the feeding device is connected with a feeding hole 3 of the dehydrating device, and the solid waste salt enters the dehydrating device through the feeding hole 3 of the dehydrating device; the discharge hole 4 of the dehydration device is connected with the second feed hole 8 of the catalytic oxidation device and is used for conveying the dehydrated solid waste salt to the catalytic oxidation device; the first feed inlet 7 of the catalytic oxidation device is connected with an oxidant and used for conveying the oxidant; a discharge port 9 of the catalytic oxidation device is connected with a feed port 12 of the cooling discharge device, solid waste salt subjected to catalytic oxidation and TOC removal enters the cooling discharge device from the feed port, and is discharged from a discharge port 13 of the cooling discharge device after being cooled; in addition, an air inlet 10 of the catalytic oxidation device is connected with an air outlet 14 of the hot air device, high-temperature hot air from a hot air system enters the catalytic oxidation device and heats the solid waste salt, and the hot air and the solid waste salt flow in the reverse direction in the catalytic oxidation device, so that the hot air and the solid waste salt are fully contacted to better heat the solid waste salt; an air outlet 11 of the catalytic oxidation device is connected with an air inlet 5 of the dehydration device, hot air after heating solid waste salt enters the dehydration device, the hot air from the catalytic oxidation device is used for heating the solid waste salt in the dehydration device and removing moisture of the solid waste salt, and then obtained low-temperature tail gas enters the tail gas treatment device through an air outlet 6 of the dehydration device.
The utility model discloses the device utilizes catalyst, oxidant and hot-air's synergism, and organic pollutant in the desorption industry solid waste salt that can be fine is below the TOC desorption in the industry solid waste salt to 30mg kg.
Example 2
Come from a solid waste salt of a certain chemical industry enterprise, its TOC content is 2700mg/kg, adopts the utility model discloses a device of desorption industry solid waste salt TOC carries out the desorption to the TOC, include following step:
(1) putting industrial solid waste salt with a certain mass into a bin of a feeding device, and continuously and quantitatively feeding the industrial solid waste salt into a dewatering device at a mass flow of 100 kg/h;
(2) the industrial solid waste salt entering the dehydration device contacts with high-temperature hot air from the catalytic oxidation device, the industrial solid waste salt is heated to 100 ℃ and stays for 30 minutes, and tail gas enters a subsequent tail gas treatment device;
(3) the dehydrated industrial solid waste salt enters a catalytic oxidation device, is mixed and contacted with a catalyst which is placed in the catalytic oxidation device in advance, oxygen is introduced according to the proportion of 0.2m3/t of the solid waste salt, the solid waste salt is heated to 300 ℃ by utilizing hot air at 350 ℃ from a hot air system, and the solid waste salt stays for 2 hours; the catalyst contains 75% of Fe, 10% of Cr, 8% of Mo and 7% of W, and is smelted at 1100 ℃ and processed into alloy metal balls with average diameter of 50mm
(4) The industrial solid waste salt after catalytic oxidation removal of TOC enters a cooling discharging device, is cooled to below 150 ℃ by a cooling water partition wall, and enters a subsequent treatment process.
The determination shows that the TOC of the industrial solid waste salt is reduced to 25mg/kg after the treatment, and a good foundation is laid for the subsequent working procedures of recovering and refining sodium chloride, sodium sulfate and the like.
The results of several different operating methods were compared in the same apparatus and are shown in table 1.
TABLE 1 comparison of the results of the different operating methods
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (9)
1. The device for removing industrial solid waste salt TOC is characterized by comprising a feeding device, a dewatering device, a catalytic oxidation device, a cooling discharging device and a hot air device, wherein the feeding device, the dewatering device, the catalytic oxidation device and the cooling discharging device are sequentially connected, the hot air device is connected with the catalytic oxidation device, and the catalytic oxidation device is in two-way connection with the dewatering device.
2. The device for removing TOC (total organic carbon) in industrial solid waste salt according to claim 1, wherein the feeding device comprises a feeding hole (1) of the feeding device and a discharging hole (2) of the feeding device, the dehydrating device comprises a feeding hole (3) of the dehydrating device, a discharging hole (4) of the dehydrating device, an air inlet (5) of the dehydrating device and an air outlet (6) of the dehydrating device, the catalytic oxidation device comprises a first feeding hole (7), a second feeding hole (8), a discharging hole (9) of the catalytic oxidation device, an air inlet (10) of the catalytic oxidation device and an air outlet (11) of the catalytic oxidation device, the cooling discharging device comprises a feeding hole (12) of the cooling discharging device and a discharging hole (13) of the cooling discharging device, the hot air device comprises an air outlet (14) of the hot air device, wherein the discharging hole (2) of the feeding device is connected with the feeding hole (3) of the dehydrating device, and a discharge port (4) of the dehydration device is connected with a second feed port (8) of the catalytic oxidation device, a discharge port (9) of the catalytic oxidation device and a gas outlet (11) of the catalytic oxidation device are respectively connected with a feed port (12) of the cooling discharge device and a gas inlet (5) of the dehydration device, and a gas inlet (10) of the catalytic oxidation device is connected with a gas outlet (14) of the hot air device.
3. The device for removing industrial solid waste salt TOC according to claim 2, characterized in that the device for removing industrial solid waste salt TOC further comprises a tail gas treatment device, and the tail gas treatment device is connected with the gas outlet (6) of the dehydration device.
4. The device for removing the TOC of the industrial solid waste salt of claim 1, wherein the feeding device comprises a storage bin, a lifting machine and a quantitative feeder which are connected in sequence.
5. The apparatus for removing TOC in industrial solid waste salt according to claim 1, wherein the dewatering apparatus is an apparatus for removing water from solid waste salt.
6. The apparatus for removing TOC in industrial solid waste salt according to claim 1, wherein the hot air device is a device for heating air.
7. The apparatus for removing industrial solid waste salt TOC according to claim 1, wherein the catalytic oxidation apparatus comprises a rotary kiln or a chain grate reactor.
8. The device for removing TOC in industrial solid waste salt according to claim 3, wherein the hot air device, the catalytic oxidation device, the dehydration device and the tail gas treatment device are communicated in sequence.
9. The device for removing industrial solid waste salt TOC according to claim 1, wherein the feeding device, the dehydration device, the catalytic oxidation device and the cooling and discharging device are communicated in sequence.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022695543.3U CN214456893U (en) | 2020-11-19 | 2020-11-19 | Device for removing TOC (total organic carbon) in industrial solid waste salt |
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| CN202022695543.3U CN214456893U (en) | 2020-11-19 | 2020-11-19 | Device for removing TOC (total organic carbon) in industrial solid waste salt |
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