阅读说明：本技术 生产液体车用尿素及脱硝用尿素溶液的生产装置及方法 (Production device and method for producing urea for liquid vehicle and urea solution for denitration ) 是由 郭和刚 邓敏 邓君 刘宏 严伟丽 于 2021-06-25 设计创作，主要内容包括：本发明涉及化工技术领域,公开了一种生产液体车用尿素及脱硝用尿素溶液的生产装置及方法,本装置包括依次连接的尿素溶液槽、尿素溶液真空汽提除氨单元、尿液混合配置单元、精制系统和成品存储单元；其中,尿素溶液槽用于存储原料尿素溶液,尿素溶液真空汽提除氨单元用于将原料尿素溶液中的残余氨汽提出来,尿液混合配置单元用于对汽提后的尿素溶液进行稀释配置,配置成符合浓度要求的车用尿素或脱硝用的尿素溶液；精制系统用于对车用尿素或脱硝用的尿素溶液进行精制；成品存储单元用于对经过精制后的车用尿素或脱硝用的尿素溶液进行暂存。本装置生产的尿素溶液符合国标及ISO国际标准,且自控水平高,即开即停,环保安全,不影响联产。(The invention relates to the technical field of chemical industry, and discloses a production device and a method for producing liquid automobile urea and urea solution for denitration, wherein the device comprises a urea solution tank, a urea solution vacuum stripping ammonia removal unit, a urine mixing configuration unit, a refining system and a finished product storage unit which are sequentially connected; the urea solution tank is used for storing a raw material urea solution, the urea solution vacuum stripping ammonia removal unit is used for stripping residual ammonia in the raw material urea solution, and the urine mixing configuration unit is used for diluting the stripped urea solution and configuring the urea solution into urea solution meeting the concentration requirement for vehicle use or denitration; the refining system is used for refining the vehicle urea or the urea solution for denitration; the finished product storage unit is used for temporarily storing the refined automobile urea or the urea solution for denitration. The urea solution produced by the device meets the national standard and ISO international standard, has high automatic control level, is immediately started and stopped, is environment-friendly and safe, and does not influence the co-production.)

1. A production device for producing liquid automobile urea and urea solution for denitration is characterized by comprising a urea solution tank, a urea solution vacuum stripping ammonia removal unit, a urine mixing and preparing unit, a refining system and a finished product storage unit which are sequentially connected;

the urea solution vacuum stripping ammonia removal unit comprises a urea stripping tower, a urea coproduction device vacuum system, a steam injector and a low-pressure steam supply unit for providing low-pressure steam, wherein the urea solution tank, the low-pressure steam supply unit and the steam injector are all connected to the urea stripping tower, and the low-pressure steam supply unit and the urea coproduction device vacuum system are connected to the steam injector;

the urine mixing and configuring unit comprises a configuring groove and a high-efficiency water-urine jet mixer, one end of the configuring groove is connected to the urea stripping tower, the other end of the configuring groove is connected to the refining system, and the high-efficiency water-urine jet mixer is arranged in the configuring groove;

a cooler is arranged between the configuration groove and the refining system, the input end of the cooler is connected to the configuration groove, and the output end of the cooler is respectively connected to the refining system and the high-efficiency water-urine jet mixer.

2. The apparatus for producing urea for liquid vehicles and urea solution for denitration according to claim 1, further comprising a product loading system and a filling system, wherein the product loading system and the filling system are connected to the finished product storage unit; and a finished product pump is arranged between the finished product storage unit and the product loading system and between the finished product storage unit and the filling system.

3. The apparatus for producing urea for liquid vehicles and urea solution for denitration according to claim 1, wherein a co-production urea apparatus for supplying urine is connected to said urea solution tank.

4. The apparatus for producing urea for liquid vehicles and a urea solution for denitration according to claim 1, wherein a desalted water supply unit for supplying desalted water is connected to said arrangement tank.

5. The apparatus of claim 1, further comprising an automatic control system connected to a transmission pipeline between the urea solution tank and the urea stripper, wherein the automatic control system is further connected to a transmission pipeline between the desalted water supply unit and the configuration tank.

6. The apparatus for producing urea for a liquid vehicle and a urea solution for denitration according to claim 1, wherein a urea solution pump is provided between said urea solution tank and said urea stripper.

7. The apparatus of claim 1, wherein the refining system comprises a microfiltration system and/or a resin system.

8. The apparatus of claim 1, wherein a configuration pump is connected between the configuration tank and the cooler, and the configuration pump is configured to deliver the configured urea solution output from the configuration tank to the cooler.

9. A production device for producing liquid vehicle urea and urea solution for denitration is characterized by comprising a urea solution tank, a urine mixing and configuration unit, a refining system and a finished product storage unit which are sequentially connected;

the urea stripper is arranged in the urea mixing and configuration unit, wherein the urea mixing and configuration unit comprises a configuration groove and a high-efficiency water-urine jet mixer, one end of the configuration groove is connected to the urea stripper, the other end of the configuration groove is connected to the refining system, and the high-efficiency water-urine jet mixer is arranged in the configuration groove;

a cooler is arranged between the configuration groove and the refining system, the input end of the cooler is connected to the configuration groove, and the output end of the cooler is respectively connected to the refining system and the high-efficiency water-urine jet mixer.

10. A production method of urea for producing liquid vehicles and urea solution for denitration is characterized by comprising the following steps:

step 1: conveying a raw material urea solution of a urea coproduction device to a urea solution tank;

step 2: the urea solution tank conveys the raw material urea solution to a urea solution vacuum stripping ammonia removal unit, the urea solution vacuum stripping ammonia removal unit adopts low-pressure steam to strip out residual ammonia in the raw material urea solution under a vacuum environment, and the stripped urea solution is conveyed to a configuration tank for configuration;

and step 3: adding desalted water into a configuration tank for dilution and configuration, configuring automobile urea or urea solution for denitration with different concentration requirements through an automatic control system in the configuration process, and simultaneously, mixing and configuring the solution by adopting a high-efficiency water-urine jet mixer to reach the required concentration;

and 4, step 4: conveying the prepared automobile urea or the urea solution for denitration to a cooler for cooling, wherein one part of the cooled automobile urea or the urea solution for denitration is circulated to the preparation tank to be used as a power source of the high-efficiency water-urine jet mixer, and the other part of the cooled automobile urea or the urea solution for denitration is conveyed to a refining system for refining to remove trace impurities;

and 5: and conveying the refined vehicle urea or the urea solution for denitration to a finished product storage unit for temporary storage, and then conveying the urea or the urea solution to a filling system or a product loading system for loading as required, and conveying the urea or the urea solution for denitration as a finished product.

Technical Field

The invention relates to the technical field of chemical industry, in particular to a production device and a method for co-producing high-quality liquid automobile urea and a urea solution for denitration with a urea device.

Background

NOx and PM exhausted by middle and heavy diesel vehicles at present severely pollute the atmosphere, which is already determined by the national environmental protection ministry at the end of 2012, and 50% of harmful gas is sourced from automobile exhaust in haze weather. There are three important means for solving the pollution of automobile exhaust: the engine is energy-saving, and the automobile urea and the oil are upgraded, wherein the automobile urea solution has the advantages of lowest cost, strongest operability, environmental protection, safety and convenient transportation. The vehicle urea solution can convert nitrogen oxides in automobile exhaust into harmless nitrogen and water, and is energy-saving and environment-friendly. The urea solution for vehicles has been gradually approved in europe, the usa and japan, and china is only in a trial phase and is not forced to be popularized at present.

The production of the urea for the foreign vehicles starts earlier, the technology becomes mature day by day, the internal purification technology and the post-treatment discharge system of the engine are basically fixed and are basically popularized, the production of the urea products for the vehicles is systematized in scale, and the production of the urea for the vehicles is mainly born by large-scale chemical enterprises. YARA corporation of norway, northern europe, has developed a scale of 50 million tons of urea solution for vehicles annually. The main producers of urea solutions for vehicles in japan are three companies, namely nissan chemical, mitsubishi chemical and libang chemical, and urea addition sites have reached more than 1200.

The use of clean energy and the treatment of exhaust emissions have been recognized in more than 200 countries and regions of the world, and the automotive urea-SCR technology is a mature and effective method for solving the problem at present. The international environmental protection organization is also actively advancing the marketing process of the technology. Both the United nations International discharge convention contracting Country and non-contracting Country have been produced and utilized in their own countries and regions. Automobile urea is currently available in developed countries such as europe, north america, asia, japan, korea, etc., and addition stations including automobile urea account for 35% or more of the total number of refueling stations and are increasing at a rate of 5% to 10% per year. The market usage is the largest in foreign Europe at present, and the annual sales volume of the vehicle urea solution in Europe reaches 150 ten thousand tons. Almost all heavy-duty diesel vehicles in Japan adopt an SCR tail gas treatment system, the market demand of the urea solution for vehicles is also rapidly increased, the sales volume of the urea solution for vehicles in Japan in 2015 is about 50 ten thousand tons, and the sales volume in 2018 is expected to reach 80 ten thousand tons. Since a few years ago, the national environmental protection agency of the United states has used the SCR technology as an official specified technology and as a necessary configuration of the SCR technology, and the market application prospect of the urea solution for vehicles is unlimited. If the using amount of the automobile urea in 2014-2020 is calculated according to the annual average acceleration rate of 10 percent, the annual demand of the automobile urea in 2020 can reach 500 ten thousand tons. The demand of the automobile urea is in direct proportion to the diesel consumption, and according to the measurement and calculation of the industry, in order to enable the tail gas emission of the diesel vehicle to reach the national fourth standard, the consumption of the automobile urea is about 4-6% of the diesel consumption. In 2016, the apparent consumption of diesel oil is about 1.65 hundred million tons, if the consumption of heavy diesel vehicles accounts for 40%, the diesel oil is about 6600 million tons, the consumption of urea for vehicles accounts for a median of 5%, and the market capacity of urea for vehicles is about 330 million tons. If the increase of the fuel demand is considered, the annual demand increase of the vehicle urea in 2017 and 2020 is calculated to be 5 percent, and the annual demand of the vehicle urea in 2020 can reach 400 ten thousand tons. If the requirements of power plants and other flue gases on the urea solution for denitration are considered, the market is wider.

From the production technology, the current domestic urea solution production method for vehicles is mainly divided into two methods, firstly, an enterprise with a natural gas head urea raw material adopts molten urea as the raw material, desalted water becomes ultrapure water through a water purification device and is mixed with liquid molten urea to prepare, the ultrapure water and the liquid molten urea are cooled to room temperature through a heat exchanger and then are subjected to series of purification such as ion exchange adsorption and the like and then are filled, the quality is high, the raw material is based on a relatively clean gas head urea device, the impurities are relatively few, but an ammonia extraction process is not performed basically, if the production fluctuation occurs, the ammonia can exceed the standard, meanwhile, through a subsequent evaporation system, the content of biuret and other impurities can be increased, and the biuret and other impurities can be diluted by water, so that the energy utilization is unreasonable; the second technology is that the industrial solid urea is purchased, and the production is carried out through the treatment procedures of ultrapure water preparation, premixing, homogenization, decoloration, ion exchange, filtration and purification, ion exchange resin regeneration system and the like. And the raw material price is high, the consumption of steam is high, and the production cost is relatively high. Some urea enterprises only use simple urea solution (about 75 percent) for dilution to prepare the vehicle urea, or produce the vehicle urea solution by simple filtration, the method can cause the ammonia or other impurities in the product to exceed the standard, and the urea solution with different raw material sources can not be treated, and a solution preparation automatic control system is not arranged, so the requirement of high-quality vehicle urea can not be met.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at the problems, the production device and the method for producing the liquid automobile urea and the urea solution for denitration are provided, the production device can be co-produced with production devices of various urea processes, according to the concrete composition condition of raw material urine, the method of vacuum stripping is utilized to remove ammonia from the urea solution sent by a urea device, the urea solution is mixed with desalted water according to different concentration requirements to prepare urea solutions with different concentrations, a high-efficiency jet mixer is used for preparation, a precise filtering system is arranged to remove trace impurities, the produced high-quality liquid automobile urea (DEF, Adblue) meets international standards of national standards and ISO, or the urea solution for denitration (SCR) of a power plant is convenient to adjust the load and has high automatic control level, the urea device is started and stopped immediately, is environment-friendly and safe, does not influence the co-production, is suitable for the co-production of various newly-built or existing urea devices, and can fully adapt to different market demands.

The technical scheme adopted by the invention is as follows:

on one hand, the invention provides a production device for producing liquid automobile urea and a urea solution for denitration, which comprises a urea solution tank, a urea solution vacuum stripping ammonia removal unit, a urine mixing and preparing unit, a refining system and a finished product storage unit which are sequentially connected;

the urea solution tank is used for storing a raw material urea solution, the urea solution vacuum stripping ammonia removal unit is used for stripping residual ammonia in the raw material urea solution, and the urine mixing configuration unit is used for diluting the stripped urea solution and configuring the urea solution into urea solution meeting the concentration requirement for vehicle use or denitration; the refining system is used for refining the vehicle urea or the urea solution for denitration to remove trace impurities; the finished product storage unit is used for temporarily storing the refined automobile urea or the urea solution for denitration.

The urea solution vacuum stripping ammonia removal unit comprises a urea stripping tower, a urea coproduction device vacuum system, a steam injector and a low-pressure steam supply unit for providing low-pressure steam, wherein the urea solution tank, the low-pressure steam supply unit and the steam injector are all connected to the urea stripping tower, and the low-pressure steam supply unit and the urea coproduction device vacuum system are connected to the steam injector;

the urine mixing and configuring unit comprises a configuring groove and a high-efficiency water-urine jet mixer, one end of the configuring groove is connected to the urea stripping tower, the other end of the configuring groove is connected to the refining system, and the high-efficiency water-urine jet mixer is arranged in the configuring groove;

a cooler is arranged between the configuration groove and the refining system, the input end of the cooler is connected to the configuration groove, and the output end of the cooler is respectively connected to the refining system and the high-efficiency water-urine jet mixer.

The system further comprises a product loading system and a filling system, wherein the product loading system and the filling system are connected to the finished product storage unit; and a finished product pump is arranged between the finished product storage unit and the product loading system and between the finished product storage unit and the filling system, and the finished product pump is used for conveying the vehicle urea or the urea solution for denitration in the finished product storage unit to the product loading system and the filling system respectively.

Furthermore, a co-production urea device for providing raw material urea solution is connected to the urea solution tank.

Further, a desalted water supply unit for supplying desalted water is connected to the arrangement tank.

The system further comprises an automatic control system, wherein the automatic control system is connected to a transmission pipeline between the urea solution tank and the urea stripping tower and used for controlling the transmission rate of the raw material urea solution, the automatic control system is also connected to a transmission pipeline between the desalted water supply unit and the configuration tank and used for controlling the transmission rate of the desalted water, and the automatic control system can be used for configuring the vehicle urea or the urea solution for denitration with different concentration requirements.

Further, a urea liquid pump is arranged between the urea solution tank and the urea stripping tower and used for conveying the raw material urea solution in the urea solution tank to the urea stripping tower for ammonia removal.

Further, the refining system includes a microfiltration system and/or a resin system.

Further, a configuration pump is connected between the configuration tank and the cooler, and the configuration pump is used for conveying the configured urea solution output by the configuration tank to the cooler.

On one hand, the invention provides a production device for producing liquid vehicle urea and a urea solution for denitration, which comprises a urea solution tank, a urine mixing and configuring unit, a refining system and a finished product storage unit which are sequentially connected;

the urea solution tank is connected with the urea solution tank, and the urea solution tank is connected with the urea solution tank;

a cooler is arranged between the configuration groove and the refining system, the input end of the cooler is connected to the configuration groove, and the output end of the cooler is respectively connected to the refining system and the high-efficiency water-urine jet mixer.

In one aspect, the invention provides a method for producing liquid vehicle urea and a urea solution for denitration, comprising the following steps:

step 1: conveying a raw material urea solution of a urea coproduction device to a urea solution tank;

step 2: the urea solution tank conveys the raw material urea solution to a urea solution vacuum stripping ammonia removal unit, the urea solution vacuum stripping ammonia removal unit adopts low-pressure steam to strip out residual ammonia in the raw material urea solution under a vacuum environment, and the stripped urea solution is conveyed to a configuration tank for configuration;

and step 3: adding desalted water into a configuration tank for dilution and configuration, configuring automobile urea or urea solution for denitration with different concentration requirements through an automatic control system in the configuration process, and simultaneously, mixing and configuring the solution by adopting a high-efficiency water-urine jet mixer to reach the required concentration;

and 4, step 4: conveying the prepared automobile urea or the urea solution for denitration to a cooler for cooling, wherein one part of the cooled automobile urea or the urea solution for denitration is circulated to the preparation tank to be used as a power source of the high-efficiency water-urine jet mixer, and the other part of the cooled automobile urea or the urea solution for denitration is conveyed to a refining system for refining to remove trace impurities;

and 5: and conveying the refined vehicle urea or the urea solution for denitration to a finished product storage unit for temporary storage, and then conveying the urea or the urea solution to a filling system or a product loading system for loading as required, and conveying the urea or the urea solution for denitration as a finished product.

Compared with the prior art, the beneficial effects of adopting the technical scheme are as follows:

the high-quality urea solution device built by the technology of producing high-quality liquid vehicle urea and denitration urea solution by co-production with a urea device can be co-produced with newly-built or existing various process urea devices, and has the characteristics of short flow, wide range of applicable raw materials, low energy consumption, convenience in starting and stopping, large load elasticity, flexibility in operation, high product purity, high automation degree of the device and the like. The high-quality urea solution produced by the technology increases the product diversity of a urea factory, can improve the market competitiveness of enterprises, and simultaneously solves the problem of a safe and environment-friendly denitration agent. Therefore, the technology brings considerable social benefit, economic benefit and environmental protection benefit to companies and urea plants.

Drawings

Fig. 1 is a schematic structural diagram of a production apparatus for producing liquid vehicle urea and a urea solution for denitration according to this embodiment.

Description of the drawings: 1-a urea solution tank, 2-a urine pump, 3-a urea stripping tower, 4-a configuration tank, 5-a high-efficiency water-urine injection mixer, 6-an automatic control system, 7-a configuration pump, 8-a cooler, 9-a refining system, 10-a finished product storage unit, 11-a finished product pump, 12-a product loading system, 13-a filling system, 14-a steam ejector, 15-a urea co-production device, 16-a desalted water supply unit, 17-a low-pressure steam supply unit and 18-a urea co-production device vacuum system.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that the indication of the orientation or the positional relationship is based on the orientation or the positional relationship shown in the drawings, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, or the orientation or the positional relationship which is usually understood by those skilled in the art, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, cannot be understood as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be further noted that the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases by those skilled in the art; the drawings in the embodiments are used for clearly and completely describing the technical scheme in the embodiments of the invention, and obviously, the described embodiments are a part of the embodiments of the invention, but not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Example 1

As shown in fig. 1, the embodiment provides a production apparatus for producing liquid vehicle urea and a urea solution for denitration, which includes a urea solution tank, a urea solution vacuum stripping ammonia removal unit, a urine mixing configuration unit, a refining system, a finished product storage unit, a product loading system and a filling system, which are connected in sequence.

The urea solution vacuum stripping ammonia removal unit comprises a urea stripping tower, a co-production urea device vacuum system, a steam injector and a low-pressure steam supply unit for providing low-pressure steam, and the urine mixing configuration unit comprises a configuration groove and a high-efficiency water-urine injection mixer.

The urea solution tank is connected to the urea stripping tower through a transmission pipeline, and a urine pump for transmitting the raw material urea solution is arranged between the urea solution tank and the urea stripping tower; the urea solution tank is also connected with a urea removing and co-production device for providing raw material urea solution.

The bottom of the urea stripping tower is connected to the configuration groove, the low-pressure steam supply unit is respectively connected to the steam ejector and the urea stripping tower, the low-pressure steam supply unit is used for providing low-pressure steam, the steam ejector is connected to the urea stripping tower, and the co-production urea device vacuum system is connected to the steam ejector to ensure the vacuum environment of the urea stripping tower in the ammonia removal process.

The high-efficiency water-urine jet mixer is arranged in the configuration tank and used for mixing the urea solution in the configuration tank, and the configuration tank is also connected with a desalted water supply unit used for providing desalted water; the automatic control system is connected between the desalted water supply unit and the configuration tank and used for controlling the transmission rate of desalted water, the automatic control system is further connected between the urea solution tank and the urea stripping tower and used for controlling the transmission rate of the raw material urea solution, the automatic control system is used for controlling the transmission of the raw material urea solution and the desalted water, and the urea solution with different concentration requirements for vehicle urea or denitration can be configured.

The configuration tank is connected to the refining system through a transmission pipeline, a configuration pump and a cooler are sequentially arranged between the configuration tank and the refining system, the configuration pump is used for conveying the configured vehicle urea or the urea solution for denitration, the cooler is provided with two output ports, one output port is connected to the refining system and transmits part of the cooled vehicle urea or the urea solution for denitration to the refining system, the other output port is connected to the high-efficiency water-urine jet mixer in the configuration tank, and the part of the cooled vehicle urea or the urea solution for denitration is transmitted back to the high-efficiency water-urine jet mixer to serve as a power source.

The refining system is connected to the finished product storage unit through a transmission pipeline, the vehicle urea or the urea solution for denitration transmitted by the refining system is refined, and after trace impurities are removed, the urea or the urea solution is transmitted to the finished product storage unit for temporary storage. Specifically, in this embodiment, the refining system may be configured as a microfiltration system and/or a resin system, etc. according to the content composition of specific impurities in the urea solution.

The product loading system and the filling system are connected to the finished product storage unit through a transmission pipeline, a finished product pump is arranged on the transmission pipeline between the product loading system and the finished product storage unit and between the product loading system and the filling system, and the finished product pump is used for conveying the finished product urea solution temporarily stored in the finished product storage unit to the product loading system and the filling system.

The embodiment also provides a production method of urea for producing liquid vehicles and urea solution for denitration, which comprises the following steps:

step 1: conveying a raw material urea solution of a urea coproduction device to a urea solution tank, wherein the concentration of the raw material urea solution is about 72-75%;

step 2: the urea solution tank conveys the raw material urea solution to a urea solution vacuum stripping ammonia removal unit, the urea solution vacuum stripping ammonia removal unit adopts low-pressure steam to strip out residual ammonia in the raw material urea solution under a vacuum environment, and the stripped urea solution is conveyed to a configuration tank for configuration;

specifically, a urea stripping tower, a low-pressure steam supply unit and a co-production urea device vacuum system are arranged in a urea solution vacuum stripping ammonia removal unit, the low-pressure steam supply unit supplies low-pressure steam to the urea stripping tower, the urea stripping tower utilizes the low-pressure steam to strip out residual ammonia in a raw material urea solution, and in the stripping process, a vacuum environment is realized through the co-production urea device vacuum system;

and step 3: adding desalted water into a configuration tank for dilution and configuration, configuring automobile urea or urea solution for denitration with different concentration requirements through an automatic control system in the configuration process, and simultaneously, mixing and configuring the solution by adopting a high-efficiency water-urine jet mixer to reach the required concentration;

and 4, step 4: conveying the prepared automobile urea or the urea solution for denitration to a cooler for cooling, wherein one part of the cooled automobile urea or the urea solution for denitration is circulated to the preparation tank to be used as a power source of the high-efficiency water-urine jet mixer, and the other part of the cooled automobile urea or the urea solution for denitration is conveyed to a refining system for refining to remove trace impurities;

and 5: and conveying the refined vehicle urea or the urea solution for denitration to a finished product storage unit for temporary storage, and then conveying the urea or the urea solution to a filling system or a product loading system for loading as required, and conveying the urea or the urea solution for denitration as a finished product.

The gas of the urea stripping tower is sent to a vacuum system of the co-production device by a steam ejector, and the condensed liquid is returned to an ammonia water tank of the co-production device.

Example 2

The embodiment provides another production device for producing urea for liquid vehicles and urea solution for denitration, which comprises a urea solution tank, a urine mixing and configuring unit, a refining system, a finished product storage unit, a product loading system and a filling system, which are sequentially connected; wherein, the urine mixing configuration unit comprises a configuration groove and a high-efficiency water-urine jet mixer.

The urea solution tank is connected to the configuration tank through a transmission pipeline, and a urine pump for conveying the raw material urea solution is arranged between the urea solution tank and the configuration tank; the urea solution tank is also connected with a co-production urea device for providing raw material urea solution.

The high-efficiency water-urine jet mixer is arranged in the configuration tank and used for mixing the urea solution in the configuration tank, and the configuration tank is also connected with a desalted water supply unit used for providing desalted water; the automatic control system is connected between the desalted water supply unit and the configuration tank and used for controlling the transmission rate of desalted water, the automatic control system is further connected between the urea solution tank and the configuration tank and used for controlling the transmission rate of the raw material urea solution, the automatic control system is used for controlling the transmission of the raw material urea solution and the desalted water, and the urea solution with different concentration requirements for the vehicle urea or the denitration can be configured.

The configuration tank is connected to the refining system through a transmission pipeline, a configuration pump and a cooler are sequentially arranged between the configuration tank and the refining system, the configuration pump is used for conveying the configured vehicle urea or the urea solution for denitration, the cooler is provided with two output ports, one output port is connected to the refining system and transmits part of the cooled vehicle urea or the urea solution for denitration to the refining system, the other output port is connected to the high-efficiency water-urine jet mixer in the configuration tank, and the part of the cooled vehicle urea or the urea solution for denitration is transmitted back to the high-efficiency water-urine jet mixer to serve as a power source.

The refining system is connected to the finished product storage unit through a transmission pipeline, the vehicle urea or the urea solution for denitration transmitted by the refining system is refined, and after trace impurities are removed, the urea or the urea solution is transmitted to the finished product storage unit for temporary storage. Specifically, in this embodiment, the refining system may be configured as a microfiltration system and/or a resin system, etc. according to the content composition of specific impurities in the urea solution.

The product loading system and the filling system are connected to the finished product storage unit through a transmission pipeline, a finished product pump is arranged on the transmission pipeline between the product loading system and the finished product storage unit and between the product loading system and the filling system, and the finished product pump is used for conveying the finished product urea solution temporarily stored in the finished product storage unit to the product loading system and the filling system.

In this embodiment, since the content of ammonia in the provided raw urea solution meets the requirement, the raw urea solution does not need to be subjected to vacuum stripping to remove ammonia, and a urea solution vacuum stripping ammonia removal unit can be omitted, and the production process flow of the production apparatus for producing urea for liquid vehicles and urea solution for denitration provided by this embodiment is as follows:

the urea solution meeting the requirement of ammonia content is conveyed to a urea solution tank from a urea coproduction device, the urea solution tank conveys the urea solution to a configuration tank through a urea liquid pump, desalted water (deionized water) is added to dilute and configure the automobile urea, a high-efficiency water-urine jet mixer is adopted in the configuration tank to mix and configure the solution to reach the required concentration, the urea solution is configured into automobile urea or urea solution for denitration with different concentration requirements through an automatic control system, then the automobile urea or urea solution for denitration is partially circulated back to the configuration tank to be used as a power source of the high-efficiency water-urine jet mixer after being cooled by a configuration pumping cooler, and the part of the urea solution is conveyed to a refining system to be refined, trace impurities are removed, and then the urea solution is collected to a finished product storage tank and finally conveyed to a filling system or a product loading system by a finished product pump for temporary storage and is sent out as a finished product.

The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed. Those skilled in the art to which the invention pertains will appreciate that insubstantial changes or modifications can be made without departing from the spirit of the invention as defined by the appended claims.