CN218261991U - Resource utilization system of high-content organic matter waste salt - Google Patents
Resource utilization system of high-content organic matter waste salt Download PDFInfo
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- CN218261991U CN218261991U CN202222690584.2U CN202222690584U CN218261991U CN 218261991 U CN218261991 U CN 218261991U CN 202222690584 U CN202222690584 U CN 202222690584U CN 218261991 U CN218261991 U CN 218261991U
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Abstract
The utility model discloses a resource utilization system of high organic matter waste salt that contains to the recovery problem of high organic matter waste salt is effectively solved to compound processing mode. The processing flow comprises the following steps: crushing, screening, drying and preheating the waste salt with high organic content, and then sending the waste salt into a calcining and melting system for secondary calcining and melting treatment; cooling and dissolving the molten waste salt, adding calcium chloride for precipitation and flocculation, and then conveying to a plate-and-frame filter pressing system for filtering out solids; sending the filtered brine to an inorganic membrane system for filtering; and (4) sending the filtered saline water into an MVR system for evaporation and crystallization to obtain the industrial salt meeting the standard. Meanwhile, the heat of the high-temperature flue gas is recovered by a drying preheating and waste heat recovery system, the raw material waste salt is preheated, and low-pressure steam required by the system is produced, so that an obvious energy-saving effect is realized; the method has the advantages that the waste salt with high organic content is effectively subjected to harmless treatment, the regeneration and cyclic utilization of industrial waste salt is realized, and the landfill load and the secondary environmental pollution risk are greatly reduced.
Description
Technical Field
The utility model belongs to the technical field of the useless salt processing of industry, especially, relate to a resource utilization system of useless salt of high organic matter that contains.
Background
The annual production amount of chemical waste salt in China is about 2100 million tons/year, wherein the waste salt in the industries of pesticide, soda ash and caustic soda often contains organic matters with high concentration and complex components, most of the organic matters have high toxicity, strong accumulation and difficult degradation, and are easy to cause serious long-term pollution to the environment, and the harmless disposal of the waste salt with high content of organic matters becomes an important link of an industrial chain under the large environment with the stricter environmental protection policy. In addition, industrial salt is an important chemical raw material and strategic resource, and the gap of industrial salt in China reaches more than 200 million tons every year. The waste salt is subjected to harmless treatment and resource utilization, and the recycling economy can be realized on the basis of eliminating environmental pollution.
The common waste salt treatment technology in the industry at present comprises a landfill method, an incineration method, a chemical method and a solidification method. The single treatment method is difficult to effectively remove organic and inorganic impurities with complex components in the waste salt. The exploration of a complex technical scheme and a corresponding treatment system for harmless disposal and recycling of waste salt with high organic content has become an urgent problem to be solved in the industry.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention aims to provide a resource utilization system for waste salt with high organic content (TOC > 8000 ppm). By adopting the composite technical scheme, the waste salt is subjected to harmless treatment and refining recovery with lower energy consumption, the environmental pollution is eliminated, and the salt resource is fully recycled, so that the problems in the prior art are solved.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:
a resource utilization system of high organic matter waste salt is characterized in that:
comprises a crushing and screening device, a drying and preheating device, a calcining and melting device, a cooling and dissolving device, a precipitation and flocculation device, a plate-frame filter pressing device, an inorganic membrane filtering device, an evaporation and crystallization device, a heat storage incineration device, a waste heat recovery device and a cooling and purification device;
the crushing and screening device is connected with the drying and preheating device through the conveying device, the back of the drying and preheating device is connected with the calcining and melting device, the calcining and melting device is connected with the heat storage incineration device through the gas transmission pipeline, and the heat storage incineration device is connected with the drying and preheating device through the gas transmission pipeline;
the calcining and melting device is connected with the cooling and dissolving device through a conveying device, the cooling and dissolving device is connected with the precipitation and flocculation device through a liquid conveying pipeline, the precipitation and flocculation device is connected with the plate frame filter pressing device through a liquid conveying pipeline, and the plate frame filter pressing device is connected with the inorganic membrane filter device through a liquid conveying pipeline;
the inorganic membrane filtering device is connected with the evaporative crystallization device after passing through the preheating device through a liquid conveying pipeline, the evaporative crystallization device is connected with the preheating device through a water and steam pipeline, and the preheating device is connected with the cooling and dissolving device through a liquid conveying pipeline;
the evaporative crystallization device is connected with the waste heat recovery device through a liquid conveying pipeline, the drying preheating device is connected with the waste heat recovery device through a gas conveying pipeline, and the waste heat recovery device is connected with the cooling purification device through a gas conveying pipeline.
On the basis of the scheme, the crushing and screening device comprises: impact crushers and shakers;
on the basis of the scheme, the drying and preheating device comprises: a hot air circulation dryer;
on the basis of the scheme, the calcining and melting device comprises: a calciner;
on the basis of the scheme, the heat storage incineration device is as follows: regenerative Thermal Oxidizer (RTO);
on the basis of the scheme, the cooling and dissolving device comprises: a stirring tank;
on the basis of the scheme, the precipitation flocculation device comprises: a flocculation tank;
on the basis of the scheme, the inorganic membrane filtering device comprises: an inorganic membrane brine filter;
on the basis of the scheme, the evaporative crystallization device comprises: a vapor mechanical recompression (MVR) evaporator.
Compared with the prior art, the resource utilization method and system for the waste salt with high organic content, provided by the utility model, have the following advantages:
the utility model discloses utilize the heat that the drying preheated and waste heat recovery system retrieved the high temperature flue gas, carry out preheating treatment and the required low pressure steam of production system to the useless salt of raw materials to realize obvious energy-conserving effect.
The utility model discloses carry out effectual innocent treatment to the waste salt that highly contains organic matter, realize the regeneration cyclic utilization of industry waste salt, reduce landfill load and environment secondary pollution risk by a wide margin.
A resource utilization method of waste salt with high content of organic matters is characterized by comprising the following steps:
step 2, feeding the waste salt obtained in the step 1 into a drying and preheating system, and drying and preheating the raw material waste salt by using high-temperature flue gas sent out by a heat storage incineration system;
step 3, feeding the waste salt obtained in the step 2 into a calcining and melting system for secondary calcining and melting treatment;
step 4, cooling and dissolving the waste salt melted in the step 3;
step 5, sending the brine obtained in the step 4 into a precipitation flocculation system, and using calcium chloride as a precipitator to generate precipitates with carbonate and hydroxyl; decomposing residual organic matters by using sodium hypochlorite;
step 6, conveying the solution obtained in the step 5 to a plate-frame filter pressing system for filtering operation to filter out solid impurities;
step 7, sending the brine subjected to filter pressing in the step 6 into an inorganic membrane filtration system to obtain membrane filtration brine;
step 8, sending the membrane filtered saline water obtained in the step 7 into an MVR system for evaporation and crystallization to obtain sodium chloride crystals;
9, sending the flue gas of the calcining and melting system in the step 3 to an RTO heat storage incineration system to burn out residual organic matters; exchanging heat between the flue gas sent out by the RTO heat storage incineration system and the raw material waste salt, and sending the flue gas to a waste heat recovery system after heat exchange to produce low-pressure steam required by an MVR (mechanical vapor recompression) system;
and step 10, conveying the tail gas sent out by the waste heat recovery system to a cooling and purifying system for treatment, and discharging after reaching the standard.
On the basis of the scheme, the calcining and melting system in the step 3 consists of a secondary scaly plate furnace and a melting furnace, wherein the operating conditions of the scaly plate furnace are 800 ℃ and 60min, and the operating conditions of the melting furnace are 900 ℃ and 60min.
On the basis of the scheme, the evaporation condensation water of the MVR recrystallization system is used for dissolving the waste salt in the step 4, and the concentration of the prepared salt water is 15-20% in the dissolving process.
On the basis of the scheme, the inorganic membrane in the step 7 is made of zirconia, and a three-stage series cross flow filtration mode is adopted in the filtration unit, wherein the operation temperature is 50-70 ℃, and the operation pressure is 3-4 barG.
On the basis of the scheme, the preheating temperature of the MVR evaporator in the step 8 is 80-90 ℃.
On the basis of the scheme, the operating temperature of an evaporation chamber of the MVR evaporator in the step 8 is 120-125 ℃, and the pressure is 60-80 kPaG.
On the basis of the scheme, the outlet temperature of the compressor of the MVR evaporator in the step 8 is 133-138 ℃, and the outlet pressure is 180-250 kPaG.
On the basis of the scheme, the operation condition of the heat storage incineration procedure in the RTO heat storage incineration system in the step 9 is more than or equal to 1100 ℃, and the retention time is more than or equal to 3 seconds.
On the basis of the scheme, the cooling and purifying process in the step 10 comprises three unit operations of quenching, cloth bag dust removal and spray washing.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
FIG. 1 is a system diagram of resource utilization of waste salt containing high content of organic substances.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which this invention belongs.
The present invention will be described in detail with reference to examples.
1. The waste salt is crushed to the particle size of 0.5-0.6 mm by a crusher and then crushed to the particle size of below 300um by a crusher. The above steps are intended to increase the specific surface area of the waste salt and improve the TOC removal effect in the calcination step.
2. And (3) conveying the waste salt to a drying preheating system, exchanging heat with high-temperature flue gas from a calcining melting system, and preheating to 200-300 ℃.
3. And (2) delivering the preheated waste salt to a secondary apron furnace for calcination, setting the calcination temperature to be 800 ℃, setting the retention time of waste salt particles to be 60min, and after the waste salt is calcined by the secondary apron furnace, the removal rate of organic matters in the waste salt is more than or equal to 99%, and the residual total organic carbon content (TOC) is less than 200ppm.
4. And (3) delivering the calcined waste salt into a melting furnace for melting, wherein the melting temperature is set to 900 ℃, the melting retention time is 60min, and the residual TOC is less than 60ppm after passing through the melting furnace.
5. And (4) sending the high-temperature flue gas of the calcining and melting system to a heat storage incineration system, and burning out residual organic matters. The flue gas is sent to a drying and preheating section to exchange heat with the waste salt of the raw material, further, the flue gas is sent to a waste heat recovery and MVR recrystallization system to exchange heat with steam condensate to produce 2-2.5 barG low-pressure steam, the temperature of the flue gas is reduced to 500-550 ℃ after heat exchange, the flue gas is sent to a cooling and purifying system to be treated, and the flue gas is sent to a bag-type dust removal system after being quenched to 200 ℃ in a quench tower to remove the smoke dust with the particle size of more than 0.05 um. And (4) conveying the flue gas subjected to smoke dust removal to a spraying and washing system, cooling to a temperature lower than 80 ℃, and then discharging to the atmosphere.
6. And (3) sending the molten waste salt to a cooling system for cooling, crushing the waste salt for the second time by a crusher after cooling until the particle size is 0.5-0.6 mm, and dissolving the crushed waste salt by using evaporation condensation water of an MVR (mechanical vapor recompression) crystallization system to prepare waste salt water with the concentration of 15-20%.
7. And (3) conveying the waste brine to a precipitation flocculation system, sufficiently adding calcium chloride according to a stoichiometric ratio based on the content of sodium carbonate and sodium hydroxide, and reacting the calcium chloride with the sodium carbonate in the brine to remove a large amount of sodium carbonate to form a sodium chloride product. Meanwhile, calcium hydroxide formed by calcium ions in a slightly alkaline environment has a flocculation effect on residual organic matters in the waste salt, so that the residual organic matters in the waste salt can be further removed. Sodium hypochlorite is added to further decompose and remove free organic substances.
8. And (3) sending the solid-liquid mixture after precipitation to a plate-and-frame filter pressing system for filter pressing separation, wherein the separated filter cake is a mixture of calcium carbonate, calcium hydroxide and a small amount of calcium humate, and sending the mixture out for treatment.
9. And (3) sending the waste brine to an inorganic membrane filtration system, and filtering in a three-stage series cross flow filtration mode. The three-stage series cross-flow filtration mode is briefly described as follows: waste brine is firstly sent into a first-stage filtering component of an inorganic membrane brine filter for filtering, and concentrated solution from the first-stage filtering component enters a second-stage filtering component for filtering; and the concentrated solution from the second-stage filtering component enters a third-stage filtering component for filtering. And a small part of the concentrated solution at the outlet of the third-stage filtering assembly is discharged according to the proportion and the concentration and sent to a salt mud pool, and the rest of the concentrated solution returns to the upstream and is mixed with the clear solution after the plate frame filtering, so that the solid-liquid ratio of the feeding solution is adjusted, and the purposes of controlling the solid content of the concentrated solution and ensuring the flow rate of the membrane surface are achieved.
10. Further, the salt mud in the salt mud tank is pumped back to the plate frame filter pressing system, and is subjected to filter pressing together with the incoming materials of the precipitation flocculation unit, clear liquid is sent to the inorganic membrane filter system, and filter cakes are sent out for treatment.
11. And (3) exchanging heat between the filtered brine obtained in the step and the evaporative condensate of the MVR recrystallization system, preheating, and then entering the system for evaporative crystallization to obtain sodium chloride crystals meeting the standard.
Example 1: the detection shows that the high-content organic waste salt of a certain chemical industry enterprise has the TOC content of 8143ppm, the sodium chloride content of about 90g/100g, the water content of about 3.5g/100g, the sodium hydroxide content of about 1g/100g, the sodium carbonate content of about 2g/100g and the miscellaneous salt content of about 2g/100g. Adopt the utility model discloses a resource utilization system and method carry out dirty salt treatment, include following step:
and step one, sending the waste salt with high organic content into a crushing and screening system for crushing and screening.
And step two, sending the waste salt obtained in the step into a drying and preheating system, and drying and preheating the raw material waste salt by using high-temperature flue gas sent out by the heat storage incineration system.
And step three, delivering the waste salt obtained in the step into a calcining and melting system, and performing secondary calcining and melting treatment.
And step four, cooling and dissolving the molten waste salt.
Fifthly, sending the brine into a precipitation flocculation system, and using calcium chloride as a precipitator to generate precipitates with carbonate and hydroxyl; decomposing residual organic matters by using sodium hypochlorite;
and step six, conveying the solution to a plate-and-frame filter pressing system for filtering operation.
And step seven, sending the filtered brine into an inorganic membrane filtration system to obtain membrane filtration brine.
And step eight, sending the membrane filtered saline water obtained in the step into an MVR system for evaporation and crystallization to obtain sodium chloride crystals.
And step nine, delivering the flue gas of the calcining and melting system in the step three to an RTO heat storage incineration system to burn out residual organic matters, further, exchanging heat between the flue gas delivered by the RTO heat storage incineration system and the waste salt of the raw material, and delivering the flue gas to a waste heat recovery system after heat exchange to produce low-pressure steam required by an MVR recrystallization system.
And step ten, conveying the tail gas sent out by the waste heat recovery to a cooling and purifying system for treatment, and discharging after reaching the standard.
The detection shows that the sodium chloride content in the obtained sodium chloride white crystal is more than 99 percent, the water content is less than 0.2 percent, the TOC is less than 20ppm, and the content of miscellaneous salts is less than 0.9 percent.
Claims (9)
1. A resource utilization system of high organic matter waste salt is characterized in that: comprises a crushing and screening device, a drying and preheating device, a calcining and melting device, a cooling and dissolving device, a precipitation and flocculation device, a plate-frame filter pressing device, an inorganic membrane filtering device, an evaporation and crystallization device, a heat storage incineration device, a waste heat recovery device and a cooling and purification device;
the crushing and screening device is connected with the drying and preheating device through the conveying device, the back of the drying and preheating device is connected with the calcining and melting device, the calcining and melting device is connected with the heat storage incineration device through the gas transmission pipeline, and the heat storage incineration device is connected with the drying and preheating device through the gas transmission pipeline;
the calcining and melting device is connected with the cooling and dissolving device through a conveying device, the cooling and dissolving device is connected with the precipitation and flocculation device through a liquid conveying pipeline, the precipitation and flocculation device is connected with the plate frame filter pressing device through a liquid conveying pipeline, and the plate frame filter pressing device is connected with the inorganic membrane filter device through a liquid conveying pipeline;
the inorganic membrane filtering device is connected with the evaporative crystallization device after passing through the preheating device through a liquid conveying pipeline, the evaporative crystallization device is connected with the preheating device through a water and steam pipeline, and the preheating device is connected with the cooling and dissolving device through a liquid conveying pipeline;
the evaporative crystallization device is connected with the waste heat recovery device through a liquid conveying pipeline, the drying preheating device is connected with the waste heat recovery device through a gas conveying pipeline, and the waste heat recovery device is connected with the cooling purification device through a gas conveying pipeline.
2. The resource utilization system of the waste salt with high content of organic matters according to claim 1, characterized in that: crushing and screening device includes: impact crushers and vibrating screens.
3. The resource utilization system of the waste salt with high content of organic matters according to claim 1, characterized in that: the drying and preheating device comprises: hot air circulation drier.
4. The resource utilization system of the waste salt with high content of organic matters, according to claim 1, is characterized in that: the calcining and melting device comprises: and (4) a calcining furnace.
5. The resource utilization system of the waste salt with high content of organic matters, according to claim 1, is characterized in that: the heat storage incineration device comprises: a regenerative thermal incinerator.
6. The resource utilization system of the waste salt with high content of organic matters according to claim 1, characterized in that: the cooling and dissolving device comprises: and (5) stirring the mixture.
7. The resource utilization system of the waste salt with high content of organic matters according to claim 1, characterized in that: the sedimentation flocculation device is as follows: a flocculation tank.
8. The resource utilization system of the waste salt with high content of organic matters according to claim 1, characterized in that: the inorganic membrane filtering device comprises: inorganic membrane brine filter.
9. The resource utilization system of the waste salt with high content of organic matters according to claim 1, characterized in that: the evaporative crystallization device is as follows: the vapor mechanically recompresses the evaporator.
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| CN202222690584.2U CN218261991U (en) | 2022-10-13 | 2022-10-13 | Resource utilization system of high-content organic matter waste salt |
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