CN215627210U - Urea desorption waste liquid ammonia nitrogen reduces discharging and waste water retrieval and utilization equipment - Google Patents
Urea desorption waste liquid ammonia nitrogen reduces discharging and waste water retrieval and utilization equipment Download PDFInfo
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- CN215627210U CN215627210U CN202021460671.3U CN202021460671U CN215627210U CN 215627210 U CN215627210 U CN 215627210U CN 202021460671 U CN202021460671 U CN 202021460671U CN 215627210 U CN215627210 U CN 215627210U
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Abstract
The utility model provides a device for reducing emission of ammonia nitrogen in urea desorption waste liquid and recycling waste water, which comprises a multi-medium catalytic adsorption filter, a circulating water tank, a first water pump, a second water pump, a separator, a chlorination reactor, an ejector, a gas separator and a dosing tank, wherein the multi-medium catalytic adsorption filter is arranged in the circulating water tank; the multi-medium catalytic adsorption filter, the circulating water tank, the first water pump, the ejector and the separator are sequentially connected; the input end of the separator is connected with the circulating water tank through a pipeline, and the output end of the separator is connected with the input end of the chlorination reactor through a pipeline; the output end of the chlorination reactor is connected with the input end of the ejector; and the input end and the output end of the dosing tank are respectively connected with the output end of the gas separator and the second water pump.
Description
Technical Field
The utility model relates to the field of chemical fertilizer wastewater treatment, in particular to equipment for ammonia nitrogen emission reduction and wastewater reuse of urea desorption waste liquid.
Background
China is the first major country for fertilizer production (urea, ammonium chloride, ammonium nitrate and ammonium bicarbonate) and consumption, the fertilizer has the effect of increasing the yield of agricultural grains by about 50 percent, and grains increased by the fertilizer can nourish about half of the population of the whole country, so that less than 7 percent of cultivated lands in the world survive 20 percent of the population of the world in China. Urea produced by the synthetic ammonia industry that gasifies pulverized coal as a raw material is a nitrogen fertilizer variety with the highest nitrogen content and the largest use amount, and is widely used in China. However, in the synthetic ammonia industry, urea preparation and nitrogen fertilizer production processes, the separation and utilization of synthesis gas, the emission reduction of pollution gas and the treatment of ammonia nitrogen wastewater become global environmental protection problems restricting the development of the industry. The fertilizer nitrogen and phosphorus containing waste water is not effectively treated and is finally discharged into rivers, lakes and seas, which causes environmental problems. Therefore, how to control the emission reduction of the polluted gas and the ammonia nitrogen wastewater from the source in the production process of the nitrogen fertilizer has important significance for the environmental health.
The urea can react to generate water in the production process, and the water and water vapor are introduced from the outside, and the water is finally carried into an evaporation section to be evaporated and condensed into desorption waste water. The waste liquid contains part of urea, ammonia, carbon dioxide, biuret and other substances, and if the substances are directly discharged, the ammonia nitrogen in the waste liquid can bring serious pollution to the water environment, and the waste liquid is always a key treatment project for fertilizer enterprises. The waste liquid produced in the production process of urea can pollute the environment, and metal ions and oxides contained in the waste liquid can cause pollution blockage and corrosion to equipment in the subsequent process, and the problems of high energy consumption in the production process, low urea recovery rate and the like are solved.
In recent years, the treatment process of urea waste liquid is also continuously improved, and the hydrolysis analysis process which can only treat 20m is used at first3The waste stream/h, but not the urea in the process waste stream. The treated wastewater can not be directly used and needs to be treated again. 2011 uses hydrolysis stripping process with a treatment capacity of 25m3H is used as the reference value. The treatment process is further improved in 2012, a urea device of a carbon dioxide stripping process is adopted, 2.5MP hydrolysis is used for resolving waste liquid, the treatment capacity of the device is improved and reaches 35m3H is used as the reference value. These processes, however, suffer from the disadvantages of high energy consumption, high construction costs and low throughput. Therefore, the utility model aims to provide a method and equipment for reducing emission of ammonia nitrogen in urea desorption waste liquid and recycling waste water, which have low energy consumption and are economical and applicable.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems that urea desorption liquid directly enters the ammonia nitrogen load in the environment, the carbon-nitrogen ratio of comprehensive wastewater is reduced, and the ammonia nitrogen content is high, the utility model provides equipment for reducing the ammonia nitrogen emission of the urea desorption waste liquid and recycling the wastewater, which can effectively reduce the ammonia nitrogen load, and the treated wastewater can be used as circulating water for replenishing water and recycling.
The utility model is realized by at least one of the following technical schemes.
A urea desorption waste liquid ammonia nitrogen emission reduction and waste water recycling device comprises a multi-medium catalytic adsorption filter, a circulating water tank, a first water pump, a second water pump, a separator, a chlorination reactor, an ejector, a gas separator and a dosing tank;
the multi-medium catalytic adsorption filter, the circulating water tank, the first water pump, the ejector and the separator are sequentially connected;
the input end of the separator is connected with the circulating water tank through a pipeline, and the output end of the separator is connected with the input end of the chlorination reactor through a pipeline; the output end of the chlorination reactor is connected with the input end of the ejector;
and the input end and the output end of the dosing tank are respectively connected with the output end of the gas separator and the second water pump.
Preferably, the input ends of the multi-medium catalytic adsorption filter, the circulating water tank and the gas separator are all provided with cooling water input.
Preferably, the water pump needs to regulate and control the urea, the ammonia and the NH in the vapor phase in the water of the circulating water tank3And CO2The concentration of the liquid phase is higher than that of the gas phase, and the high concentration is favorable for quickly resolving NH3And CO2The farther from the equilibrium point, the greater the driving force, the more favorable the hydrolysis and resolution.
Preferably, the output end of the circulating water tank is connected with the input end of the first water pump, and one output end of the first water pump is connected with the input end of the multi-medium catalytic adsorption filter to perform adsorption catalysis again, so that the adsorption catalysis efficiency is improved.
Preferably, the chlorination reactor adopts a breakpoint chlorination method, and NH in the wastewater is treated by controlling the input amount of chlorine3Oxidation of-N to N2Thereby reducing the chroma of the waste liquid, removing the stink, reducing the content of organic matters in the waste liquid water and improving the coagulation effect.
Preferably, the dosing tank utilizes a dispersing interference agent to adjust the water quality component of furnace water in the jacket, so as to prevent biuret or triurea which is difficult to remove from the jacket, and simultaneously, a treatment agent is added into the dosing tank to carry out comprehensive treatment of iron removal, catalysis, oxygen reduction and hardening and corrosion inhibition.
The use method of the equipment for reducing the emission of the ammonia nitrogen in the urea desorption waste liquid and recycling the waste water comprises the following steps:
1) the urea desorption waste liquid enters a water pump through a multi-medium catalytic adsorption filter and a circulating water tank, a part of the urea desorption waste liquid enters the multi-medium catalytic adsorption filter again for carrying out catalytic adsorption again, and a part of the urea desorption waste liquid enters a gas separator through an ejector;
2) cooling water enters the gas separator from the input end of the gas separator, and the function of the cooling water is to adjust the temperature and pressure of the water body, so that the speed and the depth of urea hydrolysis are improved; the second water pump is connected with the gas separator and the output end of the dosing tank, and is used for adjusting the mixing proportion of the acting medicament to the wastewater, so that the full mixing effect of the medicament is facilitated;
3) the nitrogen-containing wastewater of the circulating water tank enters the chlorination reactor from the output end of the separator, and the chlorination reactor controls the input amount of chlorine gas to remove NH in the wastewater by a breakpoint chlorination method3Oxidation of-N to N2Then enters the gas separator through the ejector;
4) and waste liquid in the gas separator is treated by adding a dispersion interference agent and adjusting the water quality components of furnace water in the jacket through a dosing tank, and simultaneously adding a treatment agent for iron removal, catalysis, oxygen reduction and hardness and corrosion inhibition treatment.
Preferably, the treatment agent is a vapor phase corrosion inhibitor, sodium hexametaphosphate, hydroxyethylidene diphosphonic acid (HEDP), or a flocculant (TS-609).
In the utility model, after urea desorption waste liquid passes through the set of recovery processing equipment, the average ammonia nitrogen concentration of the waste liquid is reduced from 834.4mg/L to 158.9 mg/L; the average concentration of COD (chemical oxygen demand) is reduced from 3308.2mg/L to 1324.4mg/L, and the COD load of the sewage station is reduced; the average carbon to nitrogen ratio increased from 4.29 to 11.52.
Compared with the prior art, the utility model has the following advantages and effects:
(1) in the utility model, after iron ions and oxygen in the urea desorption waste liquid are removed, the urea desorption waste liquid is directly used as a jacket and a waste heat boiler to be used as circulating water for water replenishing and recycling, so that the production cost is reduced, and the economic benefit is improved;
(2) the utility model reduces the consumption of gas-making desalted water and recovers the low-level heat energy in the waste liquid; on the other hand, the sewage yield is effectively reduced, the ammonia nitrogen concentration of raw water entering a sewage station is reduced, the carbon-nitrogen ratio of the wastewater is effectively improved, and a proper condition is created for the subsequent denitrification treatment of the wastewater.
Drawings
FIG. 1 is a diagram of an apparatus for ammonia nitrogen emission reduction and wastewater reuse for urea desorption waste liquid according to the present embodiment;
FIG. 2 is a diagram showing the change of COD concentration of the comprehensive wastewater entering the recycling equipment in the period of 60 days before and after the urea desorption waste liquid ammonia nitrogen emission reduction and wastewater recycling equipment is started;
FIG. 3 is a diagram showing the change of the ammonia nitrogen concentration of the comprehensive sewage entering the recycling equipment in the period of 60 days before and after the urea desorption waste liquid ammonia nitrogen emission reduction and wastewater reuse equipment is started;
fig. 4 is a graph showing the variation of the carbon-nitrogen ratio of the comprehensive sewage entering the recycling equipment in the period of 60 days before and after the urea desorption waste liquid ammonia nitrogen emission reduction and wastewater reuse equipment is started in the embodiment.
Detailed Description
The present invention is further described with reference to the following drawings and examples, which should not be construed as limiting the scope of the utility model.
The equipment for ammonia nitrogen emission reduction and wastewater reuse of the urea desorption waste liquid shown in the figure 1 comprises a multi-medium catalytic adsorption filter 1, a circulating water tank 2, a first water pump 3-1, a second water pump 3-2, a separator 4, a chlorination reactor 5, an ejector 6, a gas separator 7 and a dosing tank 8;
the multi-medium catalytic adsorption filter 1, the circulating water tank 2, the first water pump 3-1, the ejector 6 and the separator 7 are sequentially connected;
the output end of the circulating water tank 2 is connected with the input end of a first water pump 3-1, one output end of the first water pump 3-1 is connected with the input end of the multi-medium catalytic adsorption filter 1, so that a part of urea desorption waste liquid enters the multi-medium catalytic adsorption filter 1 again for catalytic adsorption again, and the adsorption catalytic efficiency is improved;
the input end of the separator 4 is connected with the circulating water tank 2 through a pipeline, the output end of the separator 4 is connected with the input end of the chlorination reactor 5 through a pipeline, and the output end of the chlorination reactor 5 is connected with the input end of the ejector 6;
and the input end and the output end of the dosing tank 8 are respectively connected with the output end of the gas separator 7 and the second water pump 3-2.
And cooling water is input into the input ends of the multi-medium catalytic adsorption filter 1, the circulating water tank 2 and the gas separator 7. Cooling water enters the gas separator 7 from the input end of the gas separator 7, and the function of the cooling water is to adjust the temperature and pressure of the water body, so that the urea hydrolysis speed and the urea hydrolysis depth can be improved;
the multi-medium catalytic adsorption filter 1 not only effectively removes suspended impurities to clarify waste liquid and prevent subsequent blockage of the process, but also is beneficial to accelerating the hydrolysis speed by the filter material coated with the catalyst.
The flow of the first water pump 3-1 is adjusted to lead the urea, the ammonia and the NH in the vapor phase in the water of the circulating water tank 23And CO2The concentration is kept at a proper level, and the concentration of the liquid phase is higher than that of the gas phase, so that the high concentration is beneficial to quickly resolving NH3And CO2The farther from the equilibrium point, the greater the driving force, the more favorable the hydrolysis and resolution.
The chlorination reactor 5 adopts a breakpoint chlorination method to control the input amount of chlorine gas to react NH in the wastewater3Oxidation of-N to N2Thereby reducing the chroma of the waste liquid, removing the stink, reducing the content of organic matters in the waste liquid water and improving the coagulation effect.
The application method of the equipment for reducing emission of ammonia nitrogen in urea desorption waste liquid and recycling waste water comprises the following steps:
1) the urea desorption waste liquid enters the first water pump 3-1 through the multi-medium catalytic adsorption filter 1 and the circulating water tank 2, one part of the urea desorption waste liquid enters the multi-medium catalytic adsorption filter 1 again for carrying out catalytic adsorption again, and the other part of the urea desorption waste liquid enters the gas separator 7 through the ejector 6. Cooling water is added into the circulating water tank 2 to ensure that the operation temperature is stabilized within the range of 230-236 ℃;
2) cooling water enters the gas separator 7 from the input end of the gas separator 7, and the function of the cooling water is to adjust the temperature and pressure of the water body, so that the urea hydrolysis speed and the urea hydrolysis depth can be improved; the second water pump 3-2 is connected with the output ends of the gas separator 7 and the dosing tank 8 and is used for adjusting the mixing proportion of the acting medicament to the wastewater, so that the full mixing effect of the medicament is facilitated;
3) the nitrogen-containing wastewater in the circulating water tank 2 enters a chlorination reactor 5 from the output end of a separator 4, and NH in the wastewater is treated by controlling the input amount of chlorine gas through a breakpoint chlorination method3Oxidation of-N to N2Thereby greatly reducing the chroma of the waste liquid, removing the stink, reducing the content of organic matters in the waste liquid water, improving the coagulation effect, and then entering the gas separator 7 through the ejector 6;
4) the waste liquid in the gas separator 7 is dispersed by adding a dispersion disturbing agent and adjusting the water quality component of the furnace water in the jacket through the feed tank 8, thereby preventing biuret (or triurea) which is difficult to remove from the jacket. Meanwhile, a treatment agent (phosphate such as sodium hexametaphosphate) is added to carry out comprehensive treatment such as iron removal, catalysis, oxygen reduction, hardness reduction, corrosion inhibition and the like. The equipment and the method reasonably utilize heat, recover low-level heat energy in the waste liquid, reduce the load of a circulating water system, ensure the water quality of boiler water and greatly reduce the discharge amount of ammonia nitrogen.
After the fertilizer production wastewater is subjected to desorption treatment, the original average COD concentration of the urea desorption waste liquid is 3308mg/L, the average ammonia nitrogen concentration is 1324mg/L, the average carbon-nitrogen ratio is 4.29, the iron ion content is 0.51mg/L, the oxygen content is 3mg/L, and the urea content is about 1%. The urea analysis waste liquid firstly enters a multi-medium catalytic adsorption filter, and suspended impurities are effectively removed, so that the waste liquid is clarified, and the subsequent blockage of the process is prevented. The clarified waste liquid enters a separator for separating ammonia nitrogen wastewater after being deeply hydrolyzed by a circulating water tank. And (4) the separated ammonia nitrogen wastewater enters a chlorine reactor, and an ammonia removal process is carried out by a breakpoint chlorine adding method. Then enters a gas separator through an ejector, is subjected to comprehensive treatment such as iron removal, catalysis, oxygen reduction, hardness and corrosion inhibition reduction by chemical dosing, and is sent to a jacket and a waste heat boiler for recycling by a water pump.
The embodiment adopts a multi-medium catalytic adsorption-deep hydrolysis-breakpoint chlorination-treatment recycling process, urea analysis waste liquid firstly enters a three-level multi-medium catalytic adsorption filter, and suspended impurities are effectively removed to clarify the waste liquid so as to prevent subsequent blockage of the process. The clarified waste liquid enters a separator for separating ammonia nitrogen wastewater after being deeply hydrolyzed by a circulating water tank. And (4) the separated ammonia nitrogen wastewater enters a chlorine reactor, and an ammonia removal process is carried out by a breakpoint chlorine adding method.
As can be seen from the figures 2, 3 and 4, under the normal production condition, the original average COD concentration of the urea desorption waste liquid is 3308.2mg/L, the average ammonia nitrogen concentration is 834.4mg/L, after the urea desorption waste liquid is treated by the equipment, the COD concentration is greatly reduced to 1324.4mg/L compared with the original COD concentration, and the average ammonia nitrogen concentration of the waste water is also greatly reduced to 158.92 mg/L. The reduction of the ammonia nitrogen concentration is mainly because the urea desorption waste liquid generated in a urea production workshop is recycled, the average carbon-nitrogen ratio is improved from 4.29 to 11.52, and the sufficient carbon source is provided for denitrification. The contents of iron ions and oxygen are both lower than 0.2mg/L after treatment. The iron and oxygen content in the urea desorption waste liquid is reduced, so that carbon steel equipment can be protected, the problem that the carbon steel equipment cannot be directly fed into a gas-making jacket for recovery and discharge is solved, the running cost of a sewage treatment station is reduced, the condition of hot water discharge is reduced, and the economic benefit is improved.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (3)
1. The utility model provides a urea desorption waste liquid ammonia nitrogen reduces discharging and waste water retrieval and utilization equipment which characterized in that: the device comprises a multi-medium catalytic adsorption filter (1), a circulating water tank (2), a first water pump (3-1), a second water pump (3-2), a separator (4), a chlorination reactor (5), an ejector (6), a gas separator (7) and a dosing tank (8);
the multi-medium catalytic adsorption filter (1), the circulating water tank (2), the first water pump (3-1), the ejector (6) and the gas separator (7) are sequentially connected;
the input end of the separator (4) is connected with the circulating water tank (2) through a pipeline, and the output end of the separator (4) is connected with the input end of the chlorination reactor (5) through a pipeline; the output end of the chlorination reactor (5) is connected with the input end of the ejector (6);
the second water pump (3-2) is connected with the output ends of the gas separator (7) and the dosing tank (8).
2. The equipment for ammonia nitrogen emission reduction and wastewater reuse of urea desorption waste liquid according to claim 1, characterized in that: and cooling water is input into the input ends of the multi-medium catalytic adsorption filter (1), the circulating water tank (2) and the gas separator (7).
3. The equipment for ammonia nitrogen emission reduction and wastewater reuse of urea desorption waste liquid according to claim 2, characterized in that: the output end of the circulating water tank (2) is connected with the input end of the first water pump (3-1), one output end of the first water pump (3-1) is connected with the input end of the multi-medium catalytic adsorption filter (1), adsorption catalysis is carried out again, and the adsorption catalysis efficiency is improved.
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| CN202021460671.3U CN215627210U (en) | 2020-07-22 | 2020-07-22 | Urea desorption waste liquid ammonia nitrogen reduces discharging and waste water retrieval and utilization equipment |
| AU2020102083A AU2020102083A4 (en) | 2020-07-22 | 2020-09-01 | Ammonia nitrogen emission reduction and wastewater reuse device for urea desorption effluent |
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| CN202021460671.3U CN215627210U (en) | 2020-07-22 | 2020-07-22 | Urea desorption waste liquid ammonia nitrogen reduces discharging and waste water retrieval and utilization equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111995105A (en) * | 2020-07-22 | 2020-11-27 | 华南理工大学 | Urea desorption waste liquid ammonia nitrogen emission reduction and waste water recycling equipment and use method |
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| CN112573607A (en) * | 2020-12-11 | 2021-03-30 | 华东理工大学 | Device and method for recycling ammonia nitrogen in urine through hydraulic cyclone |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111995105A (en) * | 2020-07-22 | 2020-11-27 | 华南理工大学 | Urea desorption waste liquid ammonia nitrogen emission reduction and waste water recycling equipment and use method |
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