CN219050872U - Recycling recovery device for ammonia-containing waste gas - Google Patents
Recycling recovery device for ammonia-containing waste gas Download PDFInfo
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- CN219050872U CN219050872U CN202223482046.0U CN202223482046U CN219050872U CN 219050872 U CN219050872 U CN 219050872U CN 202223482046 U CN202223482046 U CN 202223482046U CN 219050872 U CN219050872 U CN 219050872U
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Abstract
The utility model discloses an ammonia-containing waste gas recycling device, which comprises a reaction crystallization system, a crystallization treatment system and a vacuum system, wherein the reaction crystallization system is used for crystallizing ammonia-containing waste gas; the reaction crystallization system comprises a reactor, a reaction crystallizer and a reaction circulating pump, wherein the reaction circulating pump is used for circulating the solution of the reaction crystallizer back to the reactor for re-reaction; the crystallization treatment system comprises a buffer crystal growing tank and a mother liquid tank; the buffer crystal growing tank is used for receiving the reaction discharge of the reaction crystallizer, and the mother liquor tank is used for buffering mother liquor; the vacuum system comprises a condenser, a vacuum buffer tank and a vacuum pump, wherein evaporated water vapor in the reaction crystallizer enters the condenser to be condensed into condensate, the condensate enters the vacuum buffer tank, and the vacuum pump is used for sucking and discharging non-condensable gas in the vacuum buffer tank. The enrichment and crystallization growth of the ammonium sulfate are continuously realized by utilizing the reaction crystallization, the reaction heat is fully utilized, an external heat source is not utilized, and the problems of unreasonable energy utilization and high energy consumption of the traditional device are overcome.
Description
Technical Field
The utility model relates to the fields of chemical technology, energy conservation and environmental protection, in particular to an ammonia-containing waste gas recycling device.
Background
Because the ammonia-containing waste gas sources are wide, and the industries are many, such as the processing and production processes of the synthetic ammonia industry, the coking industry, the coal carbonization industry, the petrochemical industry, the LED industry, the battery industry, the smelting industry and the like, the ammonia-containing waste gas with different output and different concentration can be produced, the pollution is serious, the treatment difficulty is high, and the treatment cost is high, so that the method is always a great problem for the enterprises.
The elimination of ammonia pollution has become the focus of attention in the field of environmental protection both at home and abroad, and the world has issued laws and regulations for the implementation of emission control, such as "malodor pollutant emission Standard (GB 14554-93)" issued in 1993 in China, for NH 3 、H 2 S, odor and other emission concentrations and total emission amount are limited, and various processes are adopted in China to treat the ammonia-containing waste gas, such as various process methods including physical absorption, chemical absorption, thermal incineration, catalytic decomposition and the like, but the processes have certain limitations, the problems of high treatment and utilization difficulty and high treatment cost are still common, a simple, energy-saving and effective treatment method of the ammonia-containing waste gas is found, and the energy-saving treatment method for treating waste with waste is further realized, so that the market demand is wide, and the method has great economic and energy-saving environmental protection benefits.
In chinese patent document CN201110268763.0, an ammonia (ammonium sulfate crystallization) treatment technology process system is disclosed, after ammonia gas enters a reaction tower and is fully contacted with sulfuric acid solution to perform crystallization reaction, the ammonium sulfate solution and crystals enter a cooling recrystallization device, so that the problem that the treatment of ammonia emission in the production process reaches the standard in the LED industry is solved, but the cooling recrystallization device has high energy consumption, the reaction heat is not fully utilized, the system flow is long, and the investment is large.
In chinese patent document CN201510830845.8, a preparation method of ammonium sulfate is disclosed, which comprises the following steps: a. introducing ammonia and sulfuric acid into the crystallizer, and performing condensation cooling reaction on the ammonia to obtain ammonia water, wherein the ammonia water reacts with the sulfuric acid to generate ammonium sulfate mother liquor; b. adding 27% hydrogen peroxide by mass fraction into a crystallizer; c, crystallizing by a crystallizer, and drying by a vibrating fluidized bed to obtain an ammonium sulfate product. The method has high energy consumption, adopts a hydrogen peroxide oxidation method to remove organic matters, and has high cost, low safety and complex operation.
In chinese patent document CN201210001529.6, an ammonia-containing waste gas treatment method is disclosed, which comprises an ammonia-containing waste gas condensation process, an ammonia-containing waste gas mother liquor primary absorption process, and an ammonia-containing waste gas mother liquor tertiary spraying process, wherein in the ammonia-containing waste gas condensation process, firstly, ammonia-containing waste gas is condensed, in the subsequent ammonia-containing waste gas primary absorption process, the condensed ammonia-containing waste gas is subjected to primary absorption through a mother liquor composed of concentrated sulfuric acid and ammonia sulfate, in the subsequent ammonia-containing waste gas tertiary spraying process, the ammonia-containing waste gas after primary absorption is subjected to tertiary spraying through a mother liquor composed of concentrated sulfuric acid and ammonia sulfate, and finally, the ammonia-containing waste gas reaches the national specified emission standard, and is discharged into the atmosphere through an exhaust fan on a defoaming device. The method has the advantages of long flow, large investment, high energy consumption and complex operation.
In chinese patent document CN201910952612.3, a process for recycling and purifying waste gas containing ammonia for special fabrics is disclosed, wherein the process comprises the steps of washing with water and pickling to obtain a recycling system, absorbing waste gas containing ammonia into dilute ammonia water with concentration less than 1% and clean tail gas emission, deaminizing the absorption liquid by using a deaminizing system, and purifying and concentrating the absorption liquid by combining ammonia-containing steam and waste liquid ammonia to recycle ammonia water with concentration more than 20%. The process flow is long, the energy consumption is high, the clean tail gas emission concentration is difficult to control, and the risk of environment protection not reaching standards exists.
The existing ammonia-containing waste gas treatment process has the disadvantages of long flow, large investment, high energy consumption, difficult control of clean tail gas emission concentration, environment protection and substandard risk, and no ammonia-containing waste gas recycling device at home and abroad can realize recycling of ammonia-containing waste gas with various concentrations into ammonium sulfate without an external heat source, so that the energy is saved, the environment is protected, and no three wastes are discharged.
Disclosure of Invention
The utility model aims to solve the technical problem of providing an ammonia-containing waste gas recycling device, and solves the problems of unreasonable energy utilization and high energy consumption of the existing device.
In order to solve the technical problems, the utility model adopts the following technical scheme: the recycling device for the ammonia-containing waste gas comprises a reaction crystallization system, a crystallization treatment system and a vacuum system;
the reaction crystallization system comprises a reactor, a reaction crystallizer and a reaction circulating pump, wherein the reaction circulating pump is used for circulating the solution of the reaction crystallizer back to the reactor for re-reaction;
the crystallization treatment system comprises a buffer crystal growing tank and a mother liquid tank; the buffer crystal growing tank is used for receiving the reaction discharge of the reaction crystallizer, and the mother liquor tank is used for buffering mother liquor;
the vacuum system comprises a condenser, a vacuum buffer tank and a vacuum pump, wherein evaporated water vapor in the reaction crystallizer enters the condenser to be condensed into condensate, the condensate enters the vacuum buffer tank, and the vacuum pump is used for sucking and discharging non-condensable gas in the vacuum buffer tank.
A reaction circulating pump is arranged, high-flow circulation is adopted, concentrated sulfuric acid is continuously supplemented to absorb ammonia-containing waste gas, heat in the reactor is taken away, and crystallization and blockage caused by over-high supersaturation in the reactor are prevented; continuously realizing the concentration elevation and crystallization growth of ammonium sulfate in the reaction crystallizer; the reaction and crystallization are integrated, a special crystallizer is not needed to be additionally arranged, the process that MVR or multi-effect evaporation and the like need external heat sources or energy sources is not needed, the reaction crystallization and the reaction heat are fully utilized to meet the requirements of crystallization, the crystallization process is realized, and the energy-saving effect is better.
The solution after reaction in the reactor enters a reaction crystallizer, the concentration of ammonium sulfate is increased, crystallization is grown, reaction discharging is carried out after crystallization reaches a certain concentration, and the solution in the reaction crystallizer is circulated back to the reactor through a reaction circulating pump for re-reaction; the reaction discharge enters a buffer crystal growing tank, crystallization is further grown, partial fine crystallization is eliminated, the crystal liquid discharge is treated to obtain an ammonium sulfate wet material with water content less than or equal to 5%, and the ammonium sulfate wet material can be used for preparing compound fertilizer or further dried to obtain an ammonium sulfate product; the mother liquor separated from the ammonium sulfate wet material flows back into a mother liquor tank for caching, and the mother liquor is returned to the reaction crystallizer; the evaporation water vapor generated in the reaction crystallizer enters a condenser to be condensed, the evaporation condensate enters a vacuum buffer tank to separate the evaporation condensate from non-condensable gas, and the non-condensable gas is discharged after being pumped by a vacuum pump; the evaporated condensate can be recycled.
The enrichment and the crystallization growth of the ammonium sulfate are continuously realized by fully utilizing the reaction crystallization, the reaction heat is fully utilized, and an external heat source is not utilized, so that the problems of unreasonable energy utilization and high energy consumption of the traditional device are overcome; the energy consumption is low, the treatment cost is low, the market demand is wide, the mother liquor returns to the system for recycling, secondary treatment is not needed, and the method has great economic and energy-saving and environment-friendly benefits; the device has no wastewater discharge, and the evaporation condensate is recycled; the produced solid ammonium sulfate can be used for preparing compound fertilizer or further drying to obtain ammonium sulfate products without waste residue emission; the non-condensable gas of the vacuum system is discharged up to the standard.
Preferably, the reaction crystallization system further comprises a discharge pump, wherein the discharge pump is used for pumping the reaction discharge of the reaction crystallizer into the buffer crystal growing tank.
Preferably, one end of the reaction circulating pump is connected with the lower part of the reactor, and the other end is connected with the lower part of the reaction crystallizer.
The enrichment and the crystallization growth of the ammonium sulfate are continuously realized by fully utilizing the reaction crystallization, the reaction heat is fully utilized, and the external heat source is not utilized.
Preferably, the crystallization processing system further comprises a cyclone and a centrifuge; the cyclone and the centrifuge are used for processing the crystal liquid discharge in the buffer crystal growing tank, wherein the cyclone is used for concentrating the crystal liquid discharge to form a cyclone discharge, and the centrifuge is used for separating the cyclone discharge to obtain an ammonium sulfate wet material with the water content less than or equal to 5%.
Discharging the rotational flow and centrifugal crystallization liquid, namely ammonium sulfate wet material, wherein mother liquid obtained by rotational flow and centrifugation flows back into a mother liquid tank to be buffered, and the ammonium sulfate wet material is used for producing solid ammonium sulfate and can be used for preparing compound fertilizer or further drying to obtain an ammonium sulfate product
Preferably, the crystallization processing system further comprises a cyclone feeding pump and a mother liquor pump, wherein the cyclone feeding pump is used for pumping the crystal liquor in the buffer crystal growing tank into the cyclone; the mother liquor pump is used for pumping the mother liquor in the mother liquor tank into the reaction crystallizer.
Preferably, the vacuum buffer tank is connected with the mother liquor tank; and the evaporation condensate in the vacuum buffer tank enters the mother liquor tank and is mixed with the reflux mother liquor.
Preferably, the upper end of the reactor is provided with an ammonia-containing waste gas inlet and a concentrated sulfuric acid inlet; the upper end of the reaction crystallizer is provided with a process water inlet.
Preferably, one end of the mother liquid pump is connected with the upper end part of the reaction crystallizer, and the other end of the mother liquid pump is connected with the lower end part of the reactor; the bottom of the centrifugal machine is provided with an ammonium sulfate wet material outlet.
Preferably, a venturi structure is arranged in the reactor, so that the full mixing and reaction of raw materials are ensured; the demister is arranged in the reaction crystallizer, so that the ammonia-containing waste gas is further purified and demisted to be more in line with the standard emission.
Drawings
The following is a further detailed description of embodiments of the utility model with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of the ammonia-containing waste gas recycling device of the present utility model;
wherein: 1-ammonia-containing waste gas; 2-concentrated sulfuric acid; 3-water; 4-reaction circulating liquid; 5-discharging the reaction material; 6, discharging the crystallization liquid; 7, discharging by a cyclone; 8-ammonium sulfate wet material; 9-mother liquor reflux; 10-mother liquor; 11-evaporating water vapor; 12-evaporating the condensate; 13-noncondensable gas; 14-a reactor; 15-a reaction crystallizer; 16-a reaction circulation pump; 17-a discharge pump; 18-buffering a crystal growing groove; 19-a cyclone feed pump; 20-a cyclone; 21-a centrifuge; 22-mother liquor tank; 23-mother liquor pump; 24-a condenser; 25-a vacuum buffer tank; 26-vacuum pump.
Detailed Description
As shown in fig. 1, the arrow direction in the figure is the material transferring direction, and the recycling device for ammonia-containing waste gas in this embodiment includes a reaction crystallization system, a crystallization treatment system and a vacuum system;
the reaction crystallization system comprises a reactor 14, a reaction crystallizer 15 and a reaction circulating pump 16, wherein the reaction circulating pump 16 is used for circulating the solution of the reaction crystallizer 15 back to the reactor 14 for re-reaction;
the crystallization processing system comprises a buffer crystal growing tank 18 and a mother liquor tank 22; wherein the buffer crystal growing tank 18 is used for receiving the reaction discharge of the reaction crystallizer 15, and the mother liquor tank 22 is used for buffering mother liquor;
the vacuum system comprises a condenser 24, a vacuum buffer tank 25 and a vacuum pump 26, wherein the evaporated water vapor in the reaction crystallizer 15 enters the condenser 24 to be condensed into condensate, the condensate enters the vacuum buffer tank 25, and the vacuum pump 26 is used for sucking and discharging the noncondensable gas in the vacuum buffer tank 25.
The reaction crystallization system further comprises a discharge pump 17, wherein the discharge pump 17 is used for pumping the reaction discharge of the reaction crystallizer 15 into the buffer crystal growing tank 18.
One end of the reaction circulation pump 16 is connected to the lower portion of the reactor 14, and the other end is connected to the lower portion of the reaction crystallizer 15.
The crystallization treatment system also comprises a cyclone 20 and a centrifuge 21; the cyclone 20 and the centrifuge 21 are used for processing the crystal liquid discharge 6 in the buffer crystal growing tank 18, wherein the cyclone 20 is used for concentrating the crystal liquid discharge to form a cyclone discharge 7, and the centrifuge 21 is used for separating the cyclone discharge 7 to obtain an ammonium sulfate wet material 8 with the water content less than or equal to 5%.
The crystallization treatment system further comprises a cyclone feeding pump 19 and a mother liquor pump 23, wherein the cyclone feeding pump 19 is used for pumping the crystallization liquid discharge 6 in the buffer crystallization tank 18 into the cyclone 20; the mother liquor pump 23 is used to pump the mother liquor in the mother liquor tank 22 into the reaction crystallizer 15.
The vacuum buffer tank 25 is connected with the mother liquor tank 22; the evaporated condensate 12 in the vacuum buffer tank 25 enters the mother liquor tank 22 and is mixed with the returned mother liquor 10, and can also be used as water supplementing water for the water 3.
The upper end of the reactor 14 is provided with an ammonia-containing waste gas inlet (for the ammonia-containing waste gas 1 to enter the reactor 14) and a concentrated sulfuric acid inlet (for the concentrated sulfuric acid 2 to enter the reactor 14); the upper end of the reaction crystallizer 15 is provided with a water inlet (water supply 3 enters the reaction crystallizer 15, where the water may also be process water).
One end of a mother liquor pump 23 is connected with the upper end part of the reaction crystallizer 15, and the other end is connected with the lower end part of the reactor 14; the bottom of the centrifugal machine 21 is provided with an ammonium sulfate wet material outlet (for discharging the ammonium sulfate wet material 8).
A venturi structure is arranged inside the reactor 14; a foam remover is arranged in the reaction crystallizer 15.
In the embodiment, the ammonia-containing waste gas 1 is from petrochemical industry, the concentration is 90%wt, the concentrated sulfuric acid 2 is purchased outwards, the concentration is 93%, the ammonia-containing waste gas is directly added into the reaction circulating solution 4 to react in the reactor 14, the temperature of the reactor 14 is 70-75 ℃, and the sufficient mixing and reaction of raw materials are ensured through a Venturi structure in the reactor 14; the solution after reaction enters a reaction crystallizer 15, when the crystallization concentration is more than or equal to 10%, a discharge pump 17 is used for carrying out reaction discharge 5, and the temperature of the reaction crystallizer 15 is 68-70 ℃; a layer of flat-plate demister and a layer of silk screen demister are arranged at the upper part of the reaction crystallizer 15, evaporation water vapor 11 after ammonia-containing waste gas is further purified and demisted is discharged from the top of the reaction crystallizer 15, and the demister is flushed by water 3; the solution in the reaction crystallizer 15 is circulated back to the reactor 14 by a reaction circulation pump 16 for re-reaction. The reaction discharge 5 enters a buffer crystal growing tank 18, the crystallization is further grown, the grain diameter of crystal particles is 0.5-1 mm, partial fine crystallization is eliminated, the crystallization liquid discharge 6 enters a cyclone 20 to be concentrated to a cyclone discharge 7 with the solid content of 50%, and then the cyclone discharge 7 is separated by a centrifuge 21 to obtain an ammonium sulfate wet material 8 with the water content of 3-4%, and the ammonium sulfate wet material 8 is used in a factory; mother liquor 10 obtained by rotational flow and centrifugation enters a mother liquor tank 22 for caching through a mother liquor reflux 9, and then the mother liquor 10 is sent back to the reaction crystallizer 15 through a mother liquor pump 23.
The evaporated water vapor 11 enters a condenser 24 for condensation, the evaporated condensate 12 enters a vacuum buffer tank 25 for separation of the evaporated condensate 12 and non-condensable gas, the vacuum degree is about-80 kPag, the non-condensable gas 13 is discharged after being pumped by a vacuum pump 26, and the ammonia content is less than or equal to 5mg/L; the evaporation condensate 12 is recycled as make-up water for the water 3 (or flush water or other water in the factory).
The ammonia-containing waste gas is a byproduct in a factory, the water content and the impurity content are high, the in-situ treatment is obtained, the raw material concentrated sulfuric acid is purchased outsourcly, the price is low, and the product generated by the reaction is high-value ammonium sulfate wet material, so that the method has remarkable economic, energy-saving and environment-friendly benefits.
According to the characteristics of ammonia-containing waste gas with various concentrations, the raw material concentrated sulfuric acid can be adjusted into waste sulfuric acid and sulfuric acid solution according to the conditions, and the reaction heat is fully balanced. When the ammonia-containing waste gas is high in concentration, waste sulfuric acid and sulfuric acid solution are selected as much as possible, and waste is treated by waste, so that the running cost is further reduced; when the ammonia-containing waste gas is low in concentration, the concentrated sulfuric acid adopts a new raw material with high concentration as much as possible.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present utility model, and are not to be construed as limiting the utility model; any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (9)
1. The recycling device for the ammonia-containing waste gas is characterized by comprising a reaction crystallization system, a crystallization treatment system and a vacuum system;
the reaction crystallization system comprises a reactor, a reaction crystallizer and a reaction circulating pump, wherein the reaction circulating pump is used for circulating the solution of the reaction crystallizer back to the reactor for re-reaction;
the crystallization treatment system comprises a buffer crystal growing tank and a mother liquid tank; the buffer crystal growing tank is used for receiving the reaction discharge of the reaction crystallizer, and the mother liquor tank is used for buffering mother liquor;
the vacuum system comprises a condenser, a vacuum buffer tank and a vacuum pump, wherein evaporated water vapor in the reaction crystallizer enters the condenser to be condensed into condensate, the condensate enters the vacuum buffer tank, and the vacuum pump is used for sucking and discharging non-condensable gas in the vacuum buffer tank.
2. The ammonia-containing waste gas recycling device according to claim 1, wherein the reaction crystallization system further comprises a discharge pump for pumping the reaction discharge of the reaction crystallizer into the buffer crystallization tank.
3. The ammonia-containing waste gas recycling device according to claim 2, wherein one end of the reaction circulating pump is connected to the lower portion of the reactor, and the other end is connected to the lower portion of the reaction crystallizer.
4. The ammonia-containing waste gas recycling device according to claim 1, wherein the crystallization treatment system further comprises a cyclone and a centrifuge; the cyclone and the centrifuge are used for processing the crystal liquid discharge in the buffer crystal growing tank, wherein the cyclone is used for concentrating the crystal liquid discharge to form a cyclone discharge, and the centrifuge is used for separating the cyclone discharge to obtain an ammonium sulfate wet material with the water content less than or equal to 5%.
5. The ammonia-containing waste gas recycling device according to claim 4, wherein the crystallization treatment system further comprises a cyclone feed pump and a mother liquor pump, and the cyclone feed pump is used for pumping the crystallization liquid in the buffer crystal growing tank into the cyclone; the mother liquor pump is used for pumping the mother liquor in the mother liquor tank into the reaction crystallizer.
6. The ammonia-containing waste gas recycling device according to claim 5, wherein the vacuum buffer tank is connected to the mother liquor tank; and the evaporation condensate in the vacuum buffer tank enters the mother liquor tank and is mixed with the reflux mother liquor.
7. The ammonia-containing waste gas recycling device according to any one of claims 1 to 6, wherein the upper end of the reactor is provided with an ammonia-containing waste gas inlet and a concentrated sulfuric acid inlet; the upper end of the reaction crystallizer is provided with a process water inlet.
8. The ammonia-containing waste gas recycling device according to claim 6, wherein one end of the mother liquor pump is connected to an upper end portion of the reaction crystallizer, and the other end is connected to a lower end portion of the reactor; the bottom of the centrifugal machine is provided with an ammonium sulfate wet material outlet.
9. An ammonia-containing waste gas recycling device according to any one of claims 1 to 6, wherein a venturi structure is provided inside the reactor; a foam remover is arranged in the reaction crystallizer.
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| CN202223482046.0U CN219050872U (en) | 2022-12-26 | 2022-12-26 | Recycling recovery device for ammonia-containing waste gas |
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| CN202223482046.0U CN219050872U (en) | 2022-12-26 | 2022-12-26 | Recycling recovery device for ammonia-containing waste gas |
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