Urea evaporation system for urine concentration process
By modifying the urea evaporation system and adding evaporation condenser and injector, the problem of low vacuum in the traditional urine evaporation system is solved, and the effective increase of urine concentration and the reduction of moisture in the finished urea product is achieved.
Patent Information
- Application Number
- CN202421690596.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-07-17
AI Technical Summary
The vacuum of the urine evaporation system in traditional urea production devices is low, resulting in the inability to effectively increase the urine concentration, affecting the moisture index and quality of the finished urea product.
By modifying the urea evaporation system of the urine enrichment process, the evaporation condenser is added to improve the cooling effect of the circulating cooling water, and the vacuum degree of the evaporator is increased through the injector, thereby increasing the urine concentration.
It effectively increases the concentration of urine, reduces the moisture index of finished urea products, improves the condensation and recovery capacity of the urea device, and saves the amount of circulating water.
Smart Images
Figure CN222889383U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of urea evaporation systems, in particular to a urea evaporation system for a urine concentration process. Background Art
[0002] At present, the urine concentration process in domestic urea production equipment is realized through the evaporation system. After the urine concentration is increased to more than 95% through the evaporation system, it is sent to the subsequent granulation section.
[0003] According to on-site inspections and surveys of many urea production facilities, traditional evaporation systems generally have low vacuum levels and cannot be raised, resulting in low urine concentration sent to the granulation section, large amounts of dust in the granulation system, and high moisture content in the finished product, which does not meet the quality standards and may even cause urea to agglomerate. Utility Model Content
[0004] In order to solve the problem of low urine concentration in the current granulation section, the utility model provides a urea evaporation system for a urine concentration process.
[0005] The utility model is realized through the following technical scheme: a urea evaporation system for a urine concentration process comprises a urine tank and a urine pump, wherein the urine tank is connected to a liquid inlet of a heating chamber at the bottom of an evaporator through a urine pump, a finished liquid outlet of an evaporation chamber of the evaporator is connected to a urea granulator through a pipeline, a top gas phase outlet of the evaporation chamber of the evaporator is connected to a shell side inlet of a cooler, a lower liquid outlet on the shell side of the cooler is connected to an ammonia tank, a shell side non-condensable gas outlet of the cooler is connected to a gas inlet of an ejector, and a steam inlet of the ejector is connected to a first steam pipeline; water on the tube side inlet and water on the tube side outlet of the cooler are connected to a circulating cooling water water supply main pipe and a circulating cooling water water return main pipe through a first pipeline and a second pipeline respectively, and an evaporative condenser is connected in parallel between the first pipeline and the second pipeline.
[0006] As a further improvement of the technical solution of the utility model, the circulating cooling water inlet of the evaporative condenser is connected to the second pipeline through a third pipeline, and the circulating cooling water outlet of the evaporative condenser is connected to the first pipeline through a fourth pipeline.
[0007] As a further improvement of the technical solution of the utility model, a first valve and a second valve are respectively arranged in series on the first pipeline and the second pipeline.
[0008] As a further improvement of the technical solution of the utility model, the connection point of the third pipeline is located at the liquid inlet of the second valve, and the connection point of the fourth pipeline is located at the liquid inlet of the first valve.
[0009] As a further improvement of the technical solution of the utility model, a third valve and a fourth valve are respectively arranged in series on the third pipeline and the fourth pipeline.
[0010] The urea evaporation system for the urine concentration process provided by the utility model has the following advantages compared with the prior art:
[0011] The utility model transforms the cooling system of the surface cooler, adds an evaporative cooler on the basis of circulating cooling water cooling, and the cooled circulating water enters the surface cooler for cooling, and the circulating water that absorbs heat through the surface cooler enters the circulating water return main pipe. The cooling effect of the surface cooler is no longer affected by the public circulating water system, which ensures the cooling effect of the surface cooler, thereby ensuring the moisture content of the finished product in high temperature weather in summer, and at the same time saves part of the circulating water volume for the public circulating water cooling water system, ensuring the pressure of the public circulating cooling water main pipe, which can effectively improve the condensation effect of other coolers of the urea device and optimize the condensation recovery capacity of the system. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The accompanying drawings herein are incorporated in and constitute a part of the specification, show embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.
[0013] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0014] Figure 1 The utility model is a schematic diagram of the structure of the urea evaporation system of the urine concentration process.
[0015] In the figure: 1-urine tank, 2-urine pump, 3-evaporator, 4-surface cooler, 5-ammonia tank, 6-ejector, 7-first steam pipeline, 8-first pipeline, 801-first valve, 9-second pipeline, 901-second valve, 10-third pipeline, 101-third valve, 11-fourth pipeline, 111-fourth valve, 12-evaporative condenser, 13-second steam pipeline. DETAILED DESCRIPTION
[0016] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the scheme of the utility model will be further described below. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.
[0017] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.
[0018] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.
[0019] The specific embodiments of the present utility model are described in detail below.
[0020] like Figure 1 As shown, the utility model provides a specific embodiment of a urea evaporation system for a urine concentration process, comprising a urine tank 1 and a urine pump 2. The urine tank 1 is connected to the liquid inlet of a heating chamber at the bottom of an evaporator 3 through the urine pump 2. The finished liquid outlet of the evaporation chamber of the evaporator 3 is connected to a urea granulator through a pipeline. The top gas phase outlet of the evaporation chamber of the evaporator 3 is connected to the shell side inlet of a cooler 4. The shell side lower liquid port of the cooler 4 is connected to an ammonia tank 5. The shell side non-condensable gas outlet of the cooler 4 is connected to the gas inlet of an ejector 6. The steam inlet of the ejector 6 is connected to a first steam pipeline 7. The tube side inlet water and the tube side outlet return water of the cooler 4 are connected to the circulating cooling water upper water main and the circulating cooling water return water main through a first pipeline 8 and a second pipeline 9, respectively. An evaporative condenser 12 is connected in parallel between the first pipeline 8 and the second pipeline 9.
[0021] In this embodiment, the steam in the second steam pipeline 13 provides heat for the bottom heating chamber of the evaporator 3. Preferably, the steam pressure in the second steam pipeline 13 is 0.36MPa. The steam condensate in the bottom heating chamber of the evaporator 3 flows back to the condensate tank. The urine with a concentration of 74% in the urine tank 1 enters the evaporator 3 in a vacuum after being pressurized by the urine pump 2. After the urine is heated in the heating chamber, the water and free ammonia in the urine are evaporated and enter the shell side of the surface cooler 4 from the top gas phase outlet of the evaporator 3. The tube side of the surface cooler 4 condenses the ammonia and water vapor on the shell side into liquid through circulating cooling water and flows into the ammonia tank 5. The non-condensable gas is extracted by the ejector 6. The ejector 6 uses the steam in the first steam pipeline 7 as the power medium. Preferably, the steam pressure in the first steam pipeline 7 is 0.8MPa. The ejector 6 uses 0.8MPa steam as the ejection medium, which can increase the pressure difference before and after the ejector 6, thereby increasing the suction capacity of the ejector 6 and effectively increasing the evaporation vacuum of the evaporator 3.
[0022] Among them, the vacuum inside the evaporator 3 is mainly maintained by the suction of the ejector 6 and the condensation of the surface cooler 4. The higher the vacuum degree, the higher the urine concentration. The higher the urine concentration at the outlet of the evaporator 3, the lower the moisture index of the urea product. In order to improve the quality of the urea product and reduce the moisture content of the urea product, when this embodiment is used, the circulating cooling water in the circulating cooling water upper water main enters the surface cooler 4 through the first pipeline 8, and then enters the evaporative condenser 12 through the second pipeline 9 for cooling. The cooled circulating water enters the shell side of the surface cooler 4 for cooling and cooling. The circulating water that absorbs heat through the surface cooler 4 enters the circulating water return main through the third pipeline 9.
[0023] Specifically, the circulating cooling water inlet of the evaporative condenser 12 is connected to the second pipeline 9 through the third pipeline 10, and the circulating cooling water outlet of the evaporative condenser 12 is connected to the first pipeline 8 through the fourth pipeline 11. The circulating cooling water in this embodiment enters the evaporative condenser 12 through the third pipeline 10 for cooling, and the cooled circulating water enters the surface cooler 4 through the fourth pipeline 11 for circulating cooling.
[0024] In order to facilitate closing the first pipeline 8 and the second pipeline 9 when the evaporative condenser 12 cools the circulating water, a first valve 801 and a second valve 901 are respectively provided in series on the first pipeline 8 and the second pipeline 9 .
[0025] In specific application, the connection point of the third pipeline 10 is located at the liquid inlet of the second valve 901 , and the connection point of the fourth pipeline 11 is located at the liquid inlet of the first valve 801 .
[0026] like Figure 1 As shown, the third valve 101 and the fourth valve 111 are respectively connected in series on the third pipeline 10 and the fourth pipeline 11. When in use, the first valve 801 and the second valve 901 are closed, and the third valve 101 and the fourth valve 111 are opened. The cooling water of the evaporative condenser 12 enters the cooler 4 through the fourth pipeline 11 for cooling, and the circulating cooling water that absorbs heat returns to the evaporative condenser 12 through the third pipeline 10 for cooling. The cooled circulating water enters the cooler 4 again for circulation cooling. The cooler 4 is circulated and cooled by the cooling water of the evaporative condenser 12. In this embodiment, the cooling effect of the cooler 4 is no longer affected by the public circulating water system, which ensures the cooling effect of the cooler 4, thereby ensuring the moisture content of the finished product in high temperature weather in summer. At the same time, part of the circulating water volume is saved for the circulating water cooling water system, and the pressure of the circulating cooling water main is ensured, which can effectively improve the condensation effect of other coolers of the urea device and optimize the condensation recovery capacity of the system.
[0027] The above is only a specific implementation of the utility model, which enables those skilled in the art to understand or implement the utility model. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.
Claims
1. A urea evaporation system for a urine concentration process, comprising a urine tank (1) and a urine pump (2), characterized in that: The urine tank (1) is connected to the liquid inlet of the bottom heating chamber of the evaporator (3) through a urine pump (2); the finished liquid outlet of the evaporation chamber of the evaporator (3) is connected to the urea granulator through a pipeline; the top gas phase outlet of the evaporation chamber of the evaporator (3) is connected to the shell side inlet of the surface cooler (4); the shell side lower liquid outlet of the surface cooler (4) is connected to the ammonia tank (5); the shell side non-condensable gas outlet of the surface cooler (4) is connected to the gas inlet of the ejector (6); the steam inlet of the ejector (6) is connected to the first steam pipeline (7); the tube side inlet water and the tube side outlet return water of the surface cooler (4) are connected to the circulating cooling water upper water main pipe and the circulating cooling water return water main pipe through a first pipeline (8) and a second pipeline (9) respectively; an evaporative condenser (12) is connected in parallel between the first pipeline (8) and the second pipeline (9).
2. The urea evaporation system for the urine concentration process according to claim 1, characterized in that: The circulating cooling water inlet of the evaporative condenser (12) is connected to the second pipeline (9) through the third pipeline (10), and the circulating cooling water outlet of the evaporative condenser (12) is connected to the first pipeline (8) through the fourth pipeline (11).
3. The urea evaporation system for the urine concentration process according to claim 2, characterized in that: The first pipeline (8) and the second pipeline (9) are respectively provided with a first valve (801) and a second valve (901) in series.
4. The urea evaporation system for the urine concentration process according to claim 3, characterized in that: The connection point of the third pipeline (10) is located at the liquid inlet of the second valve (901), and the connection point of the fourth pipeline (11) is located at the liquid inlet of the first valve (801).
5. The urea evaporation system for the urine concentration process according to claim 4, characterized in that: The third pipeline (10) and the fourth pipeline (11) are respectively provided with a third valve (101) and a fourth valve (111) in series.