CN2835227Y - Low-pressure treatment device for waste liquid from synthetic ammonia and urea - Google Patents

Low-pressure treatment device for waste liquid from synthetic ammonia and urea Download PDF

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Publication number
CN2835227Y
CN2835227Y CN 200520013319 CN200520013319U CN2835227Y CN 2835227 Y CN2835227 Y CN 2835227Y CN 200520013319 CN200520013319 CN 200520013319 CN 200520013319 U CN200520013319 U CN 200520013319U CN 2835227 Y CN2835227 Y CN 2835227Y
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import
pipeline
interchanger
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项文裕
夏炎华
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Yuandong Chemical Science & Tech Co Ltd Ningbo
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Yuandong Chemical Science & Tech Co Ltd Ningbo
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Abstract

The utility model relates to a low-pressure treatment device for synthetic ammonia and urea waste liquid. The utility model comprises a feed pump (25), a reflux pump (34), a reflux condenser (4), a heat exchanger (2), a level tank (3), a hydrolyzation device and a desorption device, wherein the hydrolyzation device and the desorption device are arranged in a steam stripping hydrolyzation tower (1), and the steam stripping hydrolyzation tower (1), the feed pump (25), the reflux pump (34), the reflux condenser (4), the heat exchanger (2) and the heat exchanger (5) are respectively and mutually connected together through pipelines. The utility model has the advantages that because vapor pressure which is used is low, hydrolyzation and desorption can be carried out in the steam stripping hydrolyzation tower integrally, occupation area is small, and operation is simple; inner components in the steam stripping hydrolyzation tower can enable gas and liquid to be contacted thoroughly, the sojourn time of liquid is longer under the condition of identical equipment specification, hydrolyzation efficiency is higher, and waste water which is treated can be ensured to reach a design standard; moreover, the utility model can process liquid ammonia of a synthetic ammonia device and urea technology condensate liquid together, investment is less, and cost-recovering time is short.

Description

Synthetic ammonia, urea wastewater low pressure treatment unit
Technical field
The utility model relates to a kind of synthetic ammonia, urea wastewater low pressure treatment unit.
Background technology
In urea production process, can produce the process condensate of some amount, wherein contain urea, ammonia and carbonic acid gas.China overwhelming majority urea plants are the method recovery ammonia wherein by desorb only, content 1.1% in addition higher urea then along with the discharging of waste liquid directly enters in the Nature, cause pollution to environment.
The condensed liquid in urea preparing process treatment process mainly contains three kinds both at home and abroad at present, be hydrolysis of urea, the desorption technique of Si Tamikabang (Stamicarbon) company, the stripping technology for hydrolyzing of urea depth hydrolysis, desorption technique and Meng Shandou (Monsanto) the environmental chemistry company of Si Namu (Snamprogetti) company, its difference is mainly reflected on the pressure rating of the working pressure of hydrolysis and the steam that uses.
Hydrolysis of urea, the desorption technique of Si Tamikabang (Stamicarbon) company, hydrolysis adopt the steam of 2.5MPa to carry out direct heating, and desorb adopts the steam of about 0.45MPa to carry out direct heating, the NH after hydrolysis, the desorb in the solution 3≤ 5ppm, urea≤5ppm (design load).The CO of domestic introduction 2The process condensate of stripping urea device and partially aqueous solution total recycle process urea plant is handled this technology of employing.
The characteristics of this technology are: hydrolysis tower is a vertical structure, process condensate and steam counter current contact in tower, and device structure is simpler, processing ease, floor space is little, invests also lower.
Urea depth hydrolysis, the desorption technique of Si Namu (Snamprogetti) company, hydrolysis adopt the steam of 3.8MPa to carry out direct heating, and desorb adopts the steam of about 0.5MPa to carry out direct heating, the NH after hydrolysis, the desorb in the solution 3≤ 3ppm, urea≤3ppm (design load).The NH of domestic introduction 3The process condensate of stripping urea device and partially aqueous solution total recycle process urea plant is handled this technology of employing.
The characteristics of this technology are: hydrolysis tower is a horizontal type structure, is divided into 9~10 cells with dividing plate, and steam enters each cell respectively, and device structure is simple, and processing ease is invested lowlyer, but floor space is bigger.
Meng Shan is the hydrolysis steam stripping technique of (Monsanto) environmental chemistry company, adopts steam and the CO of 1.3MPa 2Heat stripping, hydrolysis tower and desorption tower unite two into one, and handle the NH in the solution of back 3≤ 3ppm, urea≤1ppm (design load).
The characteristics of this technology are: the vapor pressure of this process using is low, and hydrolysis tower and desorption tower unite two into one, and flow process is simple, and floor space is little, but also owing to relate to patent royalty and patent equipment, gross investment is higher.
The existing patent No. is the Chinese utility model new patent document of 03209775.1 denomination of invention for " synthetic ammonia liquid waste treating apparatus ", a kind of new structure is provided, its principal feature is, hydrolysis tower and desorption tower independently are provided with, so floor space is bigger, the technical process more complicated, engineering construction investment and process cost are also higher.Our company is being devoted to Research on New always for this reason, and aspect the condensed liquid in urea preparing process processing, company has made extensive work, successfully develops energy-conservation urea depth hydrolysis technology.
Summary of the invention
Technical problem to be solved in the utility model is to provide synthetic ammonia, the urea wastewater low pressure treatment unit that a kind of vapor pressure is low, flow process is simple and floor space is little at above-mentioned prior art present situation.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: this synthetic ammonia, the urea wastewater treatment unit, include feeding pump, reflux pump, reflux exchanger, interchanger, level tank, hydrolysis device and desorption apparatus, described feeding pump, reflux pump, reflux exchanger, level tank links to each other with pipeline respectively with interchanger, it is characterized in that described hydrolysis device and desorption apparatus are arranged in the stripping hydrolysis tower, be provided with first import in the middle and upper part of stripping hydrolysis tower, this first import is linked to each other with first outlet of interchanger by pipeline, and first outlet of interchanger communicates with first import of interchanger and is linked to each other with feeding pump by pipeline, and feeding pump links to each other with the waste liquid feed-pipe; Be provided with second outlet in the bottom of described stripping hydrolysis tower, this second outlet is linked to each other with second import on the interchanger by pipeline, and second import on this interchanger exports with second of interchanger and communicates, and second the exporting and link to each other with outlet pipe of interchanger; Described stripping hydrolysis tower its underpart is provided with second import, this second import links to each other with vapour pipe, be provided with first outlet at the top that is positioned at water stripping Xie Ta, this first outlet is linked to each other by the import of pipeline with the reflux exchanger bottom, this import is connected with the outlet on reflux exchanger top and is linked to each other with the import of level tank by pipeline, described level tank is provided with outlet up and down, described outlet is down linked to each other with reflux pump by pipeline, reflux pump one route pipeline links to each other with the triple feed inlet on stripping hydrolysis tower top, and another route pipeline is inhaled outer cooler with one of urea plant and linked to each other; The upper outlet of described level tank follows a cooler by pipeline and two of urea plant and links to each other.
As improvement, its inner cooling structure of described reflux exchanger may be selected to be: be provided with circulation tube in reflux exchanger, the import of this circulation tube is linked to each other with recycle pump by pipeline, and recycle pump is linked to each other with the outlet of water cooler by pipeline; And the outlet of circulation tube is linked to each other with the import of water cooler by pipeline.
Above-mentioned stripping hydrolysis tower may be selected to be vertical structure, and described interchanger can adopt plate-type heat exchanger, and described stripping hydrolysis tower can adopt composite plate structure in order to reduce investment outlay.
Compared with prior art, advantage of the present utility model is that because of adopting vapor pressure be that low pressure, hydrolysis and the desorb of 1.3MPa unites two into one, be that hydrolysis and desorb are carried out in the stripping hydrolysis tower jointly, thereby reduced the volume of equipment effectively, reduced floor space; And the internals of stripping hydrolysis tower can make gas-liquid fully contact, and under the situation of identical device specification, the residence time of liquid is longer, and hydrolysis efficiency is higher, guarantee that the waste water of handling reaches design objective; And flow process of the present utility model is succinct, and control loop is reasonable in design and practical, helps the steady running of device; Also have the utility model the ammoniacal liquor and the condensed liquid in urea preparing process of synthetic ammonia installation can be handled together, and hydrolysis tower adopts composite plate structure, reduced the stainless steel consumption effectively, and the hydrolysis interchanger adopts plate-type heat exchanger, thereby reduced the investment of equipment significantly, and the rational equipment layout of the utility model as not needing civil engineering skeleton construction etc., and has been saved construction investment and handled easily management; And in hydrolytic process, the ammonia of recovery, CO 2, H 2O returns in the medium voltage network of urea plant with the form of liquid, has alleviated two greatly and has followed a cold load.
The result of the utility model investment and economic benefit is as follows:
For producing 150000 tons of urea plants per year, new synthetic ammonia, the urea wastewater low pressure treatment unit processing power of this practicality is 12m 3/ h, about about 3,500,000 yuan of gross investment; After the project implementation, the recyclable NH of urea per ton 35kg, phlegma 0.4t press NH 3: 1800 yuan/ton, phlegma: 3 yuan of/ton calculating, can create 1,570,000 yuan of economic benefits (also not comprising annual so and the few effluent charge of handing over of factory) every year, 300,000 yuan/year of the steam that deduction is newly-increased and the electricity charge, 3 years is recyclable fully invested.
Description of drawings
Fig. 1 is the process structure synoptic diagram of the utility model embodiment.
Embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
As shown in Figure 1, present embodiment includes feeding pump 25, reflux pump 34, reflux exchanger 4, interchanger 2, hydrolysis device and desorption apparatus, and described feeding pump 25, reflux pump 34, reflux exchanger 4 and interchanger 2 link to each other with pipeline respectively.Described hydrolysis device and desorption apparatus are arranged in the vertical stripping hydrolysis tower 1, and composite plate structure is adopted in the inside of stripping hydrolysis tower 1, be provided with first import 12 on the top of stripping hydrolysis tower 1, this first import 12 is linked to each other with first outlet 21 of interchanger 2 by pipeline c, and first outlet 21 of interchanger 2 communicates with first import 24 of interchanger 2 and is linked to each other with feeding pump 25 by pipeline b, and feeding pump 25 links to each other with waste liquid feed-pipe a; Be provided with second outlet 14 in the bottom of described stripping hydrolysis tower 1, this second outlet 14 is linked to each other with second import 22 on the interchanger 2 by pipeline m, second import 22 on this interchanger 2 communicates with second outlet 23 of interchanger 2, and second outlet 23 of interchanger 2 links to each other with outlet pipe n, and interchanger 2 employing plate-type heat exchangers; Described stripping hydrolysis tower 1 its underpart is provided with second import 13, this second import 13 links to each other with vapour pipe L, be positioned at water stripping separate the top of tower 1 be provided with first the outlet 15, this first outlet 15 is linked to each other with the import 41 of reflux exchanger 4 bottoms by pipeline d, this import 41 is connected with the outlet 44 on backflow condenser 4 tops and is linked to each other with the import 31 of level tank 3 by pipeline e, described reflux exchanger 4 its inner cooling structures are: be provided with circulation tube 45 in reflux exchanger 4, the import 42 of this circulation tube 45 is linked to each other with recycle pump 53 by pipeline k, and recycle pump 53 is linked to each other with the outlet 51 of water cooler 5 by pipeline j; And the outlet 43 of circulation tube 45 is linked to each other with the import 52 of water cooler 5 by pipeline i.Described level tank 3 is provided with up and down outlet, and described outlet down 33 is linked to each other with reflux pump 34 by pipeline f, and reflux pump 34 1 route pipeline g link to each other with the triple feed inlet 11 on stripping hydrolysis tower 1 top, and another route pipeline p links to each other with the outer cooler of energy recovery section one suction; The upper outlet 32 of described level tank 3 follows a cooler by pipeline h and two and links to each other.
Technical process of the present utility model is as follows:
Urea wastewater (established technology phlegma) is delivered to the hydrolysis interchanger by the hydrolysis feeding pump, carry out heat exchange with waste liquid from stripping hydrolysis tower bottom, temperature is sent into hydrolysis tower top after raising, contact with the steam counter-flow of hydrolysis tower, after the tower tray distillation, urea in the process condensate is hydrolyzed to ammonia and carbonic acid gas, the NH that cat head obtains 3-CO 2-H 2The O mixed gas enters reflux exchanger, and in this partial condensation, a part of phlegma returns the desorption tower cat head as phegma by reflux pump, and another part is sent to one and inhales tower and reclaim, and coagulates gas and also send two to follow a cooler and reclaim.Less than 5ppm, this waste liquid sends into the gas making chuck after the cooling of hydrolysis interchanger or low pressure boiler is recycled, and can save the soft consumption simultaneously less than 5ppm, ammonia content for urea content in the waste liquid of discharging at the bottom of the hydrolysis Tata.And the operation of reflux exchanger is the water balance situation according to desorb load and explained hereafter system, enter the composition that hydrolysis tower phegma flow is regulated hydrolysis gas by change, make and to return the control that the water yield of production system obtains suiting with hydrolysis gas, and the utility model adopts under the following low pressure effect of 1.6MPa, can make liquid waste disposal reach the ideal effect.

Claims (6)

1, a kind of synthetic ammonia, urea wastewater low pressure treatment unit, include feeding pump (25), reflux pump (34), reflux exchanger (4), interchanger (2), level tank (3), hydrolysis device and desorption apparatus, described feeding pump (25), reflux pump (34), reflux exchanger (4), level tank (3) links to each other with pipeline respectively with interchanger (2), it is characterized in that described hydrolysis device and desorption apparatus are arranged in the stripping hydrolysis tower (1), be provided with first import (12) in the middle and upper part of stripping hydrolysis tower (1), this first import (12) is linked to each other with first outlet (21) of interchanger (2) by pipeline (c), and first outlet (21) of interchanger (2) communicates with first import (24) of interchanger (2) and is linked to each other with feeding pump (25) by pipeline (b), and feeding pump (25) links to each other with waste liquid feed-pipe (a); Be provided with second outlet (14) in the bottom of described stripping hydrolysis tower (1), this second outlet (14) is linked to each other with second import (22) on the interchanger (2) by pipeline (m), second import (22) on this interchanger (2) communicates with second outlet (23) of interchanger (2), and second outlet (23) of interchanger (2) links to each other with outlet pipe (n); Described stripping hydrolysis tower (1) its underpart is provided with second import (13), this second import (13) links to each other with vapour pipe (L), be provided with first outlet (15) at the top that is positioned at water stripping Xie Ta (1), this first outlet (15) is linked to each other by the import (41) of pipeline (d) with reflux exchanger (4) bottom, this import (41) is connected with the outlet (44) on reflux exchanger (4) top and is linked to each other with the import (31) of level tank (3) by pipeline (e), described level tank (3) is provided with outlet up and down, described outlet (33) is down linked to each other with reflux pump (34) by pipeline (f), reflux pump (34) one route pipelines (g) link to each other with the triple feed inlet (11) on stripping hydrolysis tower (1) top, and another route pipeline (p) is inhaled outer cooler with one of urea plant and linked to each other; The upper outlet (32) of described level tank (3) follows a cooler by pipeline (h) and two of urea plant and links to each other.
2, synthetic ammonia according to claim 1, urea wastewater low pressure treatment unit, it is characterized in that its inner cooling structure of described reflux exchanger (4) is: in reflux exchanger (4), be provided with circulation tube (45), the import (42) of this circulation tube (45) is linked to each other with recycle pump (53) by pipeline (k), and recycle pump (53) is linked to each other with the outlet (51) of water cooler (5) by pipeline (j); And the outlet (43) of circulation tube (45) is linked to each other with the import (52) of water cooler (5) by pipeline (i).
3, synthetic ammonia according to claim 2, urea wastewater low pressure treatment unit is characterized in that described stripping hydrolysis tower (1) is a vertical structure.
4,, it is characterized in that described interchanger (2) adopts plate-type heat exchanger according to claim 1 or 2 or 3 described synthetic ammonia, urea wastewater low pressure treatment unit.
5,, it is characterized in that described stripping hydrolysis tower (1) adopts composite plate structure according to claim 1 or 2 or 3 described synthetic ammonia, urea wastewater low pressure treatment unit.
6, synthetic ammonia according to claim 4, urea wastewater low pressure treatment unit is characterized in that described stripping hydrolysis tower (1) adopts composite plate structure.
CN 200520013319 2005-07-15 2005-07-15 Low-pressure treatment device for waste liquid from synthetic ammonia and urea Ceased CN2835227Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200520013319 CN2835227Y (en) 2005-07-15 2005-07-15 Low-pressure treatment device for waste liquid from synthetic ammonia and urea

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Application Number Priority Date Filing Date Title
CN 200520013319 CN2835227Y (en) 2005-07-15 2005-07-15 Low-pressure treatment device for waste liquid from synthetic ammonia and urea

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CN2835227Y true CN2835227Y (en) 2006-11-08

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102020590A (en) * 2009-09-11 2011-04-20 江苏恒盛化肥有限公司 Improved device of low-pressure system of carbon dioxide air stripping urea device
CN103058436A (en) * 2012-12-25 2013-04-24 中国海洋石油总公司 Method for reducing content of ammonia nitrogen in urea process condensate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102020590A (en) * 2009-09-11 2011-04-20 江苏恒盛化肥有限公司 Improved device of low-pressure system of carbon dioxide air stripping urea device
CN103058436A (en) * 2012-12-25 2013-04-24 中国海洋石油总公司 Method for reducing content of ammonia nitrogen in urea process condensate

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C35 Partial or whole invalidation of patent or utility model
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Decision number of declaring invalidation: 10929