CN104370404A - Melamine device wastewater treatment method and treatment system thereof - Google Patents
Melamine device wastewater treatment method and treatment system thereof Download PDFInfo
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- CN104370404A CN104370404A CN201410565349.XA CN201410565349A CN104370404A CN 104370404 A CN104370404 A CN 104370404A CN 201410565349 A CN201410565349 A CN 201410565349A CN 104370404 A CN104370404 A CN 104370404A
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Abstract
The invention provides a melamine device wastewater treatment method and a treatment system thereof, relating to the field of wastewater treatment in melamine production. In order to solve the problem of overproof COD (chemical oxygen demand) and total nitrogen in sewage discharge since the circulation amount of the circulating water is less than the total amount and the discharged wastewater contains OAT (organic acid) and NH3 in the existing high-pressure urea production method and equipment, the invention provides a wastewater treatment method and system for effectively removing OAT and NH3. The method comprises the following steps: carrying out high-pressure hydrolysis and waste gas stripping, and cooling the stripped gas by a cooler to obtain a dilute ammonium bicarbonate solution. The method and system can effectively remove OAT and NH3 in the wastewater, and the products in the treatment process can be recycled, thereby effectively lowering the production cost of melamine.
Description
Technical field
The invention belongs to field of industrial production, particularly relate to field of waste water treatment in Melamine Production.
Background technology
In existing Melamine Production, adopt high pressure urea method production method and equipment, have method advanced person, reactor runs at high temperature under high pressure and does not need catalyzer, stage purification, and removal of impurities removes look, the features such as good product quality.But because the method and the equipment recirculated water internal circulating load that is in operation is less than the total amount of generation, a part of waste water must be emitted after running for some time, because wherein containing OAT(organic acid), NH
3, cause COD and total nitrogen in sewage discharge to exceed standard, affect environmental protection.
Summary of the invention
The object of this invention is to provide a kind of method that can process waste water in Melamine Production.
The present invention is achieved by the following technical programs: method of wastewater treatment in a kind of melamine preparation device, comprises highly pressured hydrolysis and waste gas stripping process:
Described highly pressured hydrolysis process is, by primary heater unit, wastewater temperature is heated to 293 DEG C, enter hydrolyzer, under 8.5MPa, 285 DEG C of conditions, OAT and trimeric cyanamide are hydrolyzed, generate ammonia and carbonic acid gas, the gas phase that hydrolysis generates enters tail gas condensing system, is condensed into methylamine liquid, recycles;
Described waste gas stripping comprise for, the liquid phase generated after hydrolysis reaction is through heat-exchanger rig, and temperature enters stripping tower after being reduced to 185 DEG C, by reboiler, stripper temperature is heated to 168 DEG C, makes remaining NH
3, CO
2thorough stripping out carries out gas, and temperature is reduced to 40 DEG C by refrigerating unit by the Purified Water after stripping, as other purposes; Gas after stripping obtains rare ammonium fluid, small part refluxed stripper after apparatus for supercooling cooling, and ensure that stripper top temperature is 155 DEG C, residue sends into the NH in melamine preparation device
3/ CO
2absorption tower is reclaimed.
The present invention also provides a kind for the treatment of system used in the above-mentioned methods, waste water heating unit, hydrolyzer, stripping tower that bag is connected successively, the external storage tank of described stripping tower gaseous phase outlet, described storage tank and described stripping tower gaseous phase outlet part are provided with refrigerating unit, and described stripping tower liquid-phase outlet pipeline is provided with condensing works.
Described waste water heating unit is the wastewater heat exchange device and waste water heater that are connected successively, and described wastewater heat exchange device is communicated with described hydrolyzer liquid outlet.
Described stripping tower is provided with reboiler.
Described storage tank is provided with rare ammonium fluid pump and is communicated with stripping tower.
Described refrigerating unit is interchanger.
Described condensing works is the quenched water preheater be connected successively, dilution water preheater, Purified Water water cooler.
The present invention has following beneficial effect:
Can process the waste water produced in Melamine Production, the product after process can be back to Melamine Production and other side, reduces production cost.
Accompanying drawing explanation
Below in conjunction with specific embodiment, the present invention will be further described.
Fig. 1 is a kind of Treatment of Effluent from Melamine Unit system schematic provided by the invention.
In figure: 1. wastewater heat exchange device, 2. waste water heater, 3. hydrolyzer, 4. stripping tower, 5. reboiler, 6. rare ammonium fluid pump, 7. interchanger, 8. storage tank, 9. quenched water preheater, 10. dilution water preheater, 11. Purified Water water coolers.
Embodiment
Below in conjunction with accompanying drawing, by embodiment, the present invention is described further.
Specific embodiment: the schematic diagram as shown being treatment system of the present invention, waste water is by boosting pump supercharging, 260 DEG C are preheating to by wastewater heat exchange device 1, the thermal source of wastewater heat exchange device 1 can adopt the fluid preheating of hydrolyzer 3, in waste water heater 2, be heated to 293 DEG C, enter hydrolyzer 3, under 8.5MPa, the operational condition of 285 DEG C, OAT and trimeric cyanamide are hydrolyzed, and generate NH
3and CO
2, the gas phase of hydrolyzer 3 can send into the tail gas condensing system of melamine plant, is first ammonium liquid with chilling tail gas condensing, then sends into urea plant and recycles.Waste water does not contain the liquid phase of OAT and trimeric cyanamide after the charging of wastewater heat exchange device 1 after hydrolyzer 3 is hydrolyzed, temperature is reduced to 185 DEG C, enter stripping tower 4, stripping tower 4 working pressure 0.65MPA, by 1.6MPa, 205 DEG C middle pressure steam by reboiler 5 by stripping tower 4 heating temperatures to 168 DEG C, make NH
3and CO
2thorough stripping out, to guarantee being Purified Water up to standard at the bottom of tower, simultaneously for slowing down equipment corrosion, adds a certain amount of passivation air at stripping tower 4.Rare ammonium fluid that gas phase reclaims adds a certain amount of quantity of reflux by rare ammonium fluid pump 6 and controls stripping tower 4 head temperature 155 DEG C, containing a small amount of NH
3, CO
2obtain rare ammonium fluid by cooling water condensation in the heat exchanger 7 with the gas phase of a large amount of water vapour, be collected in storage tank 8, uncooled noble gas can send into the rear emptying of ammonia stripping tower washing.The rare ammonium fluid major part obtained in storage tank 8 is by being pumped into the NH of melamine plant
3/ CO
2absorption tower uses as method recirculated water, small part goes to stripping tower 4 top to control stripping tower 4 air outlet temperature as phegma, Purified Water temperature after stripping is higher, quenched water and dilution water recovery waste heat is heated by quenched water preheater 9 and dilution water preheater 10, again through Purified Water water cooler 11 cooling water temperature, final refining water temp drops to 40 DEG C, deliver to ammonia stripping tower replace de-salted water use, or deliver to waterworks act on behalf of water coolant use.
Treatment of Effluent from Melamine Unit method and treatment system thereof described in the embodiment of the present invention, achieve the process to unnecessary waste water, achieves recycling to the product after wastewater treatment simultaneously, reduces production cost.
Above content is the further description done the present invention in conjunction with concrete embodiment, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (7)
1. a method of wastewater treatment in melamine preparation device, comprises highly pressured hydrolysis and waste gas stripping process:
Described highly pressured hydrolysis process is, by primary heater unit, wastewater temperature is heated to 293 DEG C, enter hydrolyzer, under 8.5MPa, 285 DEG C of conditions, OAT and trimeric cyanamide are hydrolyzed, generate ammonia and carbonic acid gas, the gas phase that hydrolysis generates enters tail gas condensing system, is condensed into methylamine liquid, recycles;
Described waste gas stripping process is, the liquid phase generated after hydrolysis reaction is through heat-exchanger rig, and temperature enters stripping tower after being reduced to 185 DEG C, by reboiler, stripper temperature is heated to 168 DEG C, makes remaining NH
3, CO
2thorough stripping out carries out gas, and temperature is reduced to 40 DEG C by refrigerating unit by the Purified Water after stripping, as other purposes; Gas after stripping obtains rare ammonium fluid, small part refluxed stripper after apparatus for supercooling cooling, and ensure that stripper top temperature is 155 DEG C, residue sends into the NH in melamine preparation device
3/ CO
2absorption tower is reclaimed.
2. the treatment system used in method of wastewater treatment as claimed in claim 1, waste water heating unit, hydrolyzer, stripping tower that bag is connected successively, the external storage tank of described stripping tower gaseous phase outlet, described storage tank and described stripping tower gaseous phase outlet part are provided with refrigerating unit, and described stripping tower liquid-phase outlet pipeline is provided with condensing works.
3. treatment system as claimed in claim 2, is characterized in that: described waste water heating unit is the wastewater heat exchange device and waste water heater that are connected successively, and described wastewater heat exchange device is communicated with described hydrolyzer liquid outlet.
4. treatment system as claimed in claim 2, is characterized in that: described stripping tower is provided with reboiler.
5. treatment system as claimed in claim 2, is characterized in that: described storage tank is provided with rare ammonium fluid pump and is communicated with stripping tower.
6. treatment system as claimed in claim 2, is characterized in that: described refrigerating unit is interchanger.
7. treatment system as claimed in claim 2, is characterized in that: described condensing works is the quenched water preheater be connected successively, dilution water preheater, Purified Water water cooler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410565349.XA CN104370404A (en) | 2014-10-22 | 2014-10-22 | Melamine device wastewater treatment method and treatment system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410565349.XA CN104370404A (en) | 2014-10-22 | 2014-10-22 | Melamine device wastewater treatment method and treatment system thereof |
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|---|---|
| CN104370404A true CN104370404A (en) | 2015-02-25 |
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| CN201410565349.XA Pending CN104370404A (en) | 2014-10-22 | 2014-10-22 | Melamine device wastewater treatment method and treatment system thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106039628A (en) * | 2016-05-31 | 2016-10-26 | 四川大学 | Method for conducting catalytic hydrolysis on melamine, cyanuric acid and melamine OAT waste residues |
| CN106167470A (en) * | 2016-07-26 | 2016-11-30 | 湖北宜化集团有限责任公司 | A kind of tripolycyanamide of holding successfully reclaims the system and method for urea plant |
| CN106196703A (en) * | 2016-07-26 | 2016-12-07 | 湖北宜化集团有限责任公司 | Utilize device and the technique of tripolycyanamide circulation and stress hydro-thermal energy |
| CN107441669A (en) * | 2016-05-31 | 2017-12-08 | 四川大学 | A kind of method of heterogeneous catalysis hydrolysis melamine, cyanuric acid and melamine OAT waste residues |
| CN109534576A (en) * | 2018-12-25 | 2019-03-29 | 武汉艾科滤膜技术有限公司 | A kind of device of ultrafiltration membrane treatment melamine wastewater |
| CN109589753A (en) * | 2018-11-25 | 2019-04-09 | 鲁西化工集团股份有限公司 | A kind for the treatment of process of the ammonium fluid in urea absorption system |
-
2014
- 2014-10-22 CN CN201410565349.XA patent/CN104370404A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106039628A (en) * | 2016-05-31 | 2016-10-26 | 四川大学 | Method for conducting catalytic hydrolysis on melamine, cyanuric acid and melamine OAT waste residues |
| CN107441669A (en) * | 2016-05-31 | 2017-12-08 | 四川大学 | A kind of method of heterogeneous catalysis hydrolysis melamine, cyanuric acid and melamine OAT waste residues |
| CN106039628B (en) * | 2016-05-31 | 2019-05-31 | 四川大学 | A kind of method of catalyzing hydrolysis melamine, cyanuric acid and melamine OAT waste residue |
| CN106167470A (en) * | 2016-07-26 | 2016-11-30 | 湖北宜化集团有限责任公司 | A kind of tripolycyanamide of holding successfully reclaims the system and method for urea plant |
| CN106196703A (en) * | 2016-07-26 | 2016-12-07 | 湖北宜化集团有限责任公司 | Utilize device and the technique of tripolycyanamide circulation and stress hydro-thermal energy |
| CN106196703B (en) * | 2016-07-26 | 2019-01-18 | 湖北宜化集团有限责任公司 | Utilize the device and technique of melamine circulation and stress hydro-thermal energy |
| CN109589753A (en) * | 2018-11-25 | 2019-04-09 | 鲁西化工集团股份有限公司 | A kind for the treatment of process of the ammonium fluid in urea absorption system |
| CN109534576A (en) * | 2018-12-25 | 2019-03-29 | 武汉艾科滤膜技术有限公司 | A kind of device of ultrafiltration membrane treatment melamine wastewater |
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Application publication date: 20150225 |
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| WD01 | Invention patent application deemed withdrawn after publication |