CN219167753U

CN219167753U - Cooling crystallizer

Info

Publication number: CN219167753U
Application number: CN202223495123.6U
Authority: CN
Inventors: 袁金海; 蔡再华; 柯愈胜; 万振飞
Original assignee: Hubei Zhenhua Chemical Co ltd
Current assignee: Hubei Zhenhua Chemical Co ltd
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2023-06-13
Anticipated expiration: 2032-12-27

Abstract

The utility model discloses a cooling crystallizer, which is provided with a crystallizer barrel and an upper cover, wherein a stirring paddle is arranged in the crystallizer barrel, a jacket is arranged on the outer wall of the barrel, a cooling water pipe water inlet is formed in the upper edge of the jacket, a flowmeter and a valve are arranged on a pipeline of the water inlet, an exhaust port is formed in the top of the jacket, the exhaust port is connected with an exhaust pipeline and the valve, an outlet of the exhaust pipeline is positioned at the upper part of the water inlet, a water outlet is formed in the bottom of the jacket, the water outlet is connected with an elbow and a drainage pipeline, the outlet of the drainage pipeline is at the same height as the water inlet on one side of the jacket, a drain outlet is formed in the lowest point of the drainage elbow, and the highest point of the drainage pipeline is higher than the water inlet of the jacket; the utility model has simple structure, no need of intelligent temperature control and continuous crystallization device, low investment and low operation cost; by changing the trend of the cooling water, the cooling water enters from the upper part of the jacket and is mixed with the jacket in different densities quickly and naturally, so that the cooling water in the whole jacket has high and balanced temperature, the heat transfer temperature difference is reduced, and the wall hanging is avoided.

Description

Cooling crystallizer

Technical Field

The utility model relates to the technical field of chemical equipment, in particular to a cooling crystallizer.

Background

The crystallization of substances with larger temperature influence on solubility generally adopts a jacket cooling crystallizer, and the jacket cooling crystallizer often generates a crystal wall hanging phenomenon in the cooling crystallization process, so that the crystallization rate is reduced, the crystallization period is prolonged, crystal particles are tiny and easy to agglomerate, and the crystallization cannot be continued when the wall hanging is serious. The factors of the smoothness of the inner wall of the crystallizer, the stirring type, the concentration of the crystallization liquid and the heat transfer temperature difference affect the wall hanging, wherein the most main factors are the heat transfer temperature difference.

The traditional cooling mode is that cooling water enters and exits from the upper part of the jacket, namely, cooling water enters from the bottom of the jacket and flows out from the upper part of the jacket. The trend of the cooling medium makes the heat transfer temperature difference at the bottom of the crystallizer large, which often causes the wall to be firstly hung at the bottom of the crystallizer and then spread from bottom to top.

In order to solve the problem of large heat transfer temperature difference, devices such as an intelligent temperature control system, a continuous crystallizer and the like are researched, but the devices have large investment, large circulating pump power and high operation cost. Therefore, the development of a cooling crystallizer is an important subject of the research of the present utility model.

Disclosure of Invention

The utility model aims to solve the problems of large heat transfer temperature difference at the bottom, wall hanging at the bottom of the crystallizer and the like of the existing crystallizer, and provides a cooling crystallizer which reduces the heat transfer temperature difference and avoids the wall hanging problem by changing the trend of cooling water.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a cooling crystallizer, has crystallizer barrel and upper cover, the stirring rake is equipped with in the crystallizer barrel, is equipped with the cover on the barrel outer wall, set up a plurality of condenser tube water inlet on the cover, all be equipped with flowmeter and valve on the pipeline of water inlet, the gas vent has been seted up at the top of cover, and the gas vent is connected with exhaust duct and valve, and the exhaust duct export is located the upper portion of water inlet, the gas vent is used for discharging the noncondensable gas in the cover, avoids the water level reduction in the cover and reduces the heat transfer area, and the delivery port is seted up to the bottom of cover, and the delivery port is connected with elbow, drainage pipe export and the water inlet of cover one side are in same height, and the drain is seted up to the minimum of drainage elbow, and the drain is equipped with the valve, debris such as periodic discharge incrustation scale, rust avoid the pipeline to block up. The highest point of the drainage pipeline is higher than the water inlet of the jacket, so that the water temperature at the bottom of the jacket is controlled in a proper range.

Preferably, in the utility model, the water inlets of the cooling water pipes are positioned at the same height of the jacket.

Preferably, the outlet of the exhaust pipe is at least 300mm higher than the top of the outlet elbow of the drainage pipe in the utility model.

Preferably, the outer wall of the crystallizer barrel except the bottom is provided with a jacket.

Compared with the prior art, the utility model has the following advantages:

(1) The crystallization equipment provided by the utility model has the advantages of simple structure, no need of an intelligent temperature control and continuous crystallization device, low investment and low operation cost. By changing the trend of the cooling water, the cooling water enters and exits from the top, the temperature and the density of the cooling water are different, and the temperature is low and the density is high. Cooling water enters the jacket from the upper part, and is quickly and naturally mixed due to different densities, so that the temperature of the cooling water in the whole jacket is high and balanced, the heat transfer temperature difference is reduced, and wall hanging is avoided. Thoroughly solves the problems of wall built-up, low crystallization rate and long crystallization period existing in the cooling crystallization process.

(2) Taking sodium sulfide pentahydrate production as an example, the sodium sulfide content of the crystallization liquid in the traditional process is 32%, the crystallization rate is 20%, and the crystallization period is 16 hours. When the utility model is used for producing sodium sulfide pentahydrate, the content of sodium sulfide in the crystallization liquid is increased to 36-38%, the crystallization rate is increased to 40-55%, and the crystallization period is 8 hours.

(3) The utility model has the advantages of less water consumption for cleaning the crystallizer and short time.

Drawings

FIG. 1 is a cross-sectional view of the present utility model;

FIG. 2 is a top view of the present utility model;

wherein: the device comprises a 1-crystallizer barrel, a 2-upper cover, a 3-jacket, a 4-cooling water pipe, a 5-water inlet, a 6-flowmeter, a 7-valve, an 8-air outlet, a 9-air exhaust pipeline, a 10-water outlet, an 11-drainage pipeline, a 12-sewage outlet and a 13-stirring paddle.

Detailed Description

The following description of the embodiments of the present utility model will be made more apparent in the drawings of the present utility model, wherein it is to be understood that the embodiments described are merely some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, it should be noted that, the terms "upper", "lower", "inner", "outer", and the like indicate an orientation or a positional relationship based on that shown in the drawings, or an orientation or a positional relationship in which the inventive product is conventionally put in use, merely for convenience of describing the present utility model or simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be configured or operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

1-2, a cooling crystallizer is disclosed, which comprises a crystallizer barrel 1 and an upper cover 2, wherein a stirring paddle 12 is arranged in the crystallizer barrel 1, a jacket 3 is arranged on the outer wall of the barrel 1, a plurality of cooling water pipes 4 water inlets 5 are arranged on the upper edge of the jacket 3, a flowmeter 6 and a valve 7 are arranged on the pipeline of the water inlets 5, an exhaust port 8 is arranged at the top of the jacket 3, the exhaust port 8 is connected with an exhaust pipeline 9 and a valve 7, the outlet of the exhaust pipeline 9 is arranged at the upper part of the water inlets 5, the exhaust port 8 is used for discharging noncondensable gas in the jacket, the reduction of the heat exchange area caused by the reduction of the water level in the jacket 3 is avoided, a water outlet 10 is arranged at the bottom of the jacket 3, a water outlet 10 is connected with an elbow and a drainage pipeline 11, the outlet of the drainage pipeline 11 is at the same height as the water inlet 5 at one side of the jacket, a drain 12 is arranged at the lowest point of the drainage elbow, the drain 12 is provided with the valve 7, sundries such as scale, rust and the like are regularly discharged, and the pipeline blockage is avoided. The highest point of the drainage pipeline 11 is higher than the water inlet 5 of the jacket, so that the water temperature at the bottom of the jacket is controlled in a proper range.

Preferably, the water inlet 5 of the cooling water pipe 4 is positioned at the same height of the jacket 3.

Preferably, the outlet of the exhaust pipe 9 is at least 300mm higher than the top of the outlet elbow of the drain pipe 11 in the present utility model.

Preferably, the outer wall of the crystallizer barrel 1 except the bottom is provided with a jacket 3.

The working principle of the utility model is as follows: the cooling water in the cooling water pipe 4 enters from the jacket 3 and goes out from the jacket, the temperature and the density of the cooling water are different, and the temperature and the density are high. Cooling water enters the jacket 3 from the upper part, and is quickly and naturally mixed due to different densities, so that the temperature of the cooling water in the whole jacket 3 is high and balanced, the heat transfer temperature difference is reduced, and wall hanging is avoided. Thoroughly solves the problems of wall hanging, low crystallization rate and long crystallization period existing in cooling crystallization.

Claims

1. A cooling crystallizer having a crystallizer bowl and an upper cover, characterized in that: the crystallizer is characterized in that a stirring paddle is arranged in the crystallizer barrel, a jacket is arranged on the outer wall of the barrel, a plurality of cooling water pipe inlets are formed in the upper edge of the jacket, a flowmeter and a valve are arranged on pipelines of the water inlet, an exhaust port is formed in the top of the jacket, the exhaust port is connected with an exhaust pipeline and the valve, an outlet of the exhaust pipeline is arranged at the upper part of the water inlet, a water outlet is formed in the bottom of the jacket, the water outlet is connected with an elbow and a drainage pipeline, the outlet of the drainage pipeline and the water inlet on one side of the jacket are at the same height, a drain outlet is formed in the lowest point of the drainage elbow, and the highest point of the drainage pipeline is higher than the water inlet of the jacket.

2. A cooling crystallizer as in claim 1, wherein: the water inlets of the cooling water pipes are positioned at the same height position of the jacket.

3. A cooling crystallizer as in claim 1, wherein: the outlet of the exhaust pipeline is at least 300mm higher than the top of the outlet elbow pipe of the drainage pipeline.

4. A cooling crystallizer as in claim 1, wherein: the outer wall of the crystallizer cylinder body except the bottom is provided with a jacket.