CN200974821Y

CN200974821Y - Full-liquid-phase isothermal carbamide converter

Info

Publication number: CN200974821Y
Application number: CNU2006200116738U
Authority: CN
Inventors: 张立强; 侯守建
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-11-17
Filing date: 2006-11-17
Publication date: 2007-11-14
Anticipated expiration: 2016-11-17

Abstract

The utility model discloses a full fluid isothermal urea synthetic tower, including a tower body (1), an inlet (5) for liquid ammonia at the bottom of the tower body (1), an inlet (6) for carbon dioxide, and an inlet (7) for methylphosphoric liquid, and a discharge hole (8) at the top. The urea synthetic tower characterized in that a liquid atomization reactor (2) is equipped in the tower body (1), communicating with the inlet (5) for liquid ammonia, the inlet (6) for carbon dioxide and the inlet (7) for methylphosphoric liquid, a high efficient tray (4) with a heat exchange pipeline (3) provided on the middle and upper interior wall of the tower body (1), the heat exchange pipeline communicating with the liquid atomization reactor (2), which is a urea synthetic tower, high exchange rate of carbon dioxide, low power consumption, high efficiency and corrosion resistance.

Description

A kind of whole liquid phase isothermal urea synthesizer

Technical field:

The utility model relates to the urea production technical field, is a kind of whole liquid phase isothermal urea synthesizer specifically.

Background technology:

Urea synthesizer is to produce the urea key equipment, because it uses under the operational condition in high temperature, high pressure and strong corrosive media, causes lining corrosion and sealing leak easily, therefore causes suspending operation or slashing production and a large amount of maintenance cost of cost; Urea synthesizer commonly used at present, mostly adopt aqueous solution recycle to extinction Technology, the transformation efficiency of carbonic acid gas has only 60%-64%, in order to increase the transformation efficiency of carbonic acid gas, people have carried out a series of Increasing Production and Energy Saving transformation, making great efforts to make atmospheric carbon dioxide to be distributed in ammonia liquor and the first liquid, but the transformation efficiency of carbonic acid gas also do not reach more than 70% always, thereby efficient is low, and energy consumption is big.

Summary of the invention:

The purpose of this utility model is the deficiency that overcomes above-mentioned prior art, and a kind of whole liquid phase isothermal urea synthesizer is provided, and has mainly solved the problem that existing urea synthesizer transformation efficiency perishable and carbonic acid gas is low, energy consumption is big.

In order to achieve the above object, the utility model is that this is existing like this: a kind of whole liquid phase isothermal urea synthesizer, it comprises tower body 1, liquefied ammonia import 5 is established in tower body 1 bottom, a carbon dioxide inlet 6 and a first liquid import 7, discharge port 8 is established on tower body 1 top, its special character is to establish atomization of liquid reactor 2 in tower body 1 inside, atomization of liquid reactor 2 and liquefied ammonia import 5, a carbon dioxide inlet 6 and a first liquid import 7 communicate, in tower body 1, establish high-efficient tower plate 4 on the inner side-wall of middle and upper part, establish heat exchange pipeline 3 on high-efficient tower plate 4, heat exchange pipeline 3 communicates with atomization of liquid reactor 2

Compared with the prior art a kind of whole liquid phase isothermal urea synthesizer described in the utility model has following positively effect: 1, increased atomization of liquid reactor in urea synthesizer, make liquid phase feed adopt atomised form, thereby increase the liquid phase reaction area effectively, improve speed of reaction greatly, changed two-phase (gas, liquid) the stream synthesis method of traditional urea synthesis; 2, in urea synthesizer, increased heat exchange pipeline, the heat of building-up reactions is delivered to each urea formation reaction district of urea synthesizer upper, middle and lower rapidly and uniformly, the temperature upper and lower temperature difference dwindles in making in the urea synthesizer, myopia is in the isothermal tower, make ureagenetic dehydration reaction just from the urea synthesis tower bottom, because it is a thermo-negative reaction that dehydration reaction generates urea, so provide carboxylamine amine dehydration reaction to generate the required heat of urea by heat exchange pipeline, the formation reaction that has changed urea in the existing technology is from the inchoate shortcoming in urea synthesizer middle part, the utilization of the useful space of the urea synthesizer that increases, can guarantee the required residence time of carboxylamine amine dehydration effectively, can make the output of tower improve 30% like this, the transformation efficiency of carbonic acid gas can bring up to 75%, and the ammonia carbon ratio can drop to 3.2, and steam/hydrocarbons ratio also can reduce to 0.85; 3, install simply, do not destroy scantlings of the structure, size for connection and the reaction parameter of former synthetic tower.

Description of drawings:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the side-view of Fig. 1.

Embodiment:

In order to understand better and to implement, describe a kind of whole liquid phase isothermal urea synthesizer of the utility model in detail below in conjunction with embodiment.

Embodiment 1, referring to Fig. 1,2, be processed into tower body 1, embodiment 1, referring to Fig. 1,2, be processed into tower body 1, offer liquefied ammonia import 5 in tower body 1 bottom, a carbon dioxide inlet 6 and a first liquid import 7 are offered discharge port 8 on its top, at the tower body 1 inner atomization of liquid reactor 2 of installing, atomization of liquid reactor 2 and liquefied ammonia import 5, a carbon dioxide inlet 6 and a first liquid import 7 communicate, and high-efficient tower plate 4 is installed on the inner side-wall of tower body 1 middle and upper part then, and high-efficient tower plate 4 is a multilayer, heat exchange pipeline 3 is installed on high-efficient tower plate 4, heat exchange pipeline 3 can be " U " type, also can be " S " type, and heat exchange pipeline 3 communicates with atomization of liquid reactor 2; Atomization of liquid reactor 2, heat exchange pipeline 3, high-efficient tower plate 4 adopt urea level 316Lmod, TA2, zirconia material.

A kind of whole liquid phase isothermal urea synthesizer described in the utility model during use, adds corresponding opening for feed from corresponding opening for feed and add liquefied ammonia, carbonic acid gas and a first liquid, charging NH in tower ₃/ CO ₂The molecule number is than 3.2-4.0, H ₂O/CO ₂The molecule number compares 0.6-1.0; Thoroughly reacted with carbonic acid gas moment liquefied ammonia and the first liquid back that atomizes in atomization of liquid reactor, generate the carboxylamine ammonia solution, at first enter heat exchange pipeline, enter the urea synthesis tower bottom from the other end of heat exchange pipeline, temperature is 186-190 ℃ in the tower, and pressure is 16-19MPa; The carboxylamine ammonia solution is finished dehydration reaction in urea synthesizer, generate urea, from discharge hole for discharge, enters the decomposition evaporation system.

Claims

1, a kind of whole liquid phase isothermal urea synthesizer, it comprises tower body (1), liquefied ammonia import (5) is established in tower body (1) bottom, a carbon dioxide inlet (6) and a first liquid import (7), discharge port (8) is established on tower body (1) top, it is characterized in that establishing atomization of liquid reactor (2) in tower body (1) inside, atomization of liquid reactor (2) and liquefied ammonia import (5), a carbon dioxide inlet (6) and a first liquid import (7) communicate, in tower body (1), establish high-efficient tower plate (4) on the inner side-wall of middle and upper part, establish heat exchange pipeline (3) on high-efficient tower plate (4), heat exchange pipeline (3) communicates with atomization of liquid reactor (2).

2, the specific equipment urea synthesizer of a kind of whole liquid phase isothermal urea synthesis method according to claim 1 is characterized in that described heat exchange pipeline (3) is " U " type, also can be " S " type.

3, the specific equipment urea synthesizer of a kind of whole liquid phase isothermal urea synthesis method according to claim 1 is characterized in that described high-efficient tower plate (4) is multilayer.

4,, it is characterized in that described atomization of liquid reactor (2), heat exchange pipeline (3), high-efficient tower plate (4) adopt urea level 316Lmod, TA2, zirconia material according to the specific equipment urea synthesizer of claim 1 or 2 or 3 described a kind of whole liquid phase isothermal urea synthesis methods.