CN215195501U - Crystallization device that potassium dihydrogen phosphate concentrate blockked up - Google Patents

Abstract

The utility model discloses a crystallization device that potassium dihydrogen phosphate concentrate blockked up relates to potassium dihydrogen phosphate crystallization equipment technical field. The device comprises a concentrated solution buffer tank, a delivery pump and a first pipeline which are connected in sequence, wherein the first pipeline is sequentially connected with a first valve, a second pipeline and a first crystallization tank through pipeline connecting pieces, and the first pipeline is sequentially connected with a second valve, a third pipeline, a third valve and a second crystallization tank through pipeline connecting pieces; the outer side walls of the first pipeline, the second pipeline and the third pipeline are all sleeved with steam jackets, the steam jackets are connected with a steam generator, and heat insulation cotton is attached to the outer side walls of the steam jackets; the first pipeline, the second pipeline and the third pipeline are all obliquely arranged and are not provided with horizontal sections; the second crystallizing groove is higher than the first crystallizing groove. The pipeline is preheated and insulated by the arrangement of the steam jacket, so that the condition that the potassium dihydrogen phosphate concentrated solution blocks the pipeline in the pipeline due to cooling crystallization is avoided.

Description

Crystallization device that potassium dihydrogen phosphate concentrate blockked up

Technical Field

The utility model relates to a potassium dihydrogen phosphate crystallization equipment technical field, concretely relates to crystallization device that potassium dihydrogen phosphate concentrate blockked up.

Background

The potassium dihydrogen phosphate is an important chemical and has wide application in the industries of agriculture, chemical industry, medicine, food and the like. The preparation of the potassium dihydrogen phosphate is mainly to obtain a potassium dihydrogen phosphate solution by a wet phosphoric acid extraction method, then to concentrate the solution to obtain a potassium dihydrogen phosphate concentrated solution, to pump the concentrated solution into an OSL crystallization tank by a centrifugal pump for crystallization, to obtain a final product by the steps of centrifugal separation, drying and the like. The potassium dihydrogen phosphate is concentrated by vacuum triple effect concentration, the specific gravity of the concentrated solution is 1.35-1.39, the temperature is 90-100 ℃, and when the temperature of the concentrated solution is lower than 80 ℃, crystals are separated out. At present, concentrated solution enters a cooling crystallizer and is conveyed by a centrifugal pump pipeline, because the heat load of an OSL continuous crystallization tank is moved away and is unbalanced, the working temperature of the crystallization tank is over 50 ℃, and the intermittent conveying is adopted in the conveying process of the concentrated solution for separating out crystals. Therefore, at the initial starting stage, the conveying pipeline is in a cooling state, and the high-concentration potassium dihydrogen phosphate is easy to crystallize and block the pipeline after meeting the pipeline in the cooling state; when the vehicle is stopped, the concentrated solution in the pipeline can not be completely discharged due to more elbow joints of the pipeline, crystals are formed in the pipeline, and the pipeline is blocked.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a crystallization device that potassium dihydrogen phosphate concentrate blockked up solves the problem that current crystal system crystallization efficiency is low, pipeline easily blocks up.

In order to solve the technical problem, the utility model adopts the following technical scheme: the utility model provides a crystallization device that potassium dihydrogen phosphate concentrate blockked up which characterized in that: the device comprises a concentrated solution buffer tank, a delivery pump and a first pipeline which are sequentially connected, wherein the first pipeline is sequentially connected with a first valve, a second pipeline and a first crystallization tank through pipeline connecting pieces; the outer side walls of the first pipeline, the second pipeline and the third pipeline are all sleeved with steam jackets, the steam jackets are connected with a steam generator, and heat insulation cotton is attached to the outer side walls of the steam jackets; the first pipeline, the second pipeline and the third pipeline are all obliquely arranged and are not provided with horizontal sections; the second crystallizing groove is higher than the first crystallizing groove.

The connecting part of the third pipeline and the third valve is in an arc shape which is bent upwards.

A fourth valve and a secondary steam condensate pipe are sequentially connected to the joint of the third pipeline and the third valve through a pipeline connecting piece; the joint of the second valve and the third pipeline is sequentially connected with a fifth valve, a washing water delivery pipe and a washing water collecting tank through pipeline connecting pieces.

The further technical scheme is that the concentrated solution buffer tank is a hollow tank body, a motor is arranged at the top of the buffer tank, an output shaft of the motor is connected with a stirring paddle, the stirring paddle is located in the tank body, a discharge hole is formed in the bottom of the buffer tank, and the discharge hole is connected with a material conveying pump.

The further technical scheme is that a spray head is further arranged at the top of the concentrated solution buffer tank and connected with a washing water generation device, and a sewage discharge outlet is further formed in the side wall of the bottom of the tank body.

The further technical proposal is that the outer side wall of the concentrated solution buffer tank is adhered with heat preservation cotton.

The working principle is as follows: before starting, steam is introduced into the steam jacket to preheat a conveying pipeline, and the potassium dihydrogen phosphate concentrated solution in a high-temperature state is sent into a concentrated solution buffer tank to be buffered and stored. After the vehicle is started, the first valve is opened, and the feed delivery pump sends the potassium dihydrogen phosphate concentrated solution into the first crystallization tank at a lower position through the second pipeline. And after the materials in the first crystallization tank reach the set volume, closing the first valve, opening the second valve and the third valve, and conveying the potassium dihydrogen phosphate concentrated solution into a second high-level crystallization tank through a third pipeline by a conveying pump. During the period, discharging the potassium dihydrogen phosphate concentrated solution after the crystallization in the first crystallization tank is completed, closing the second valve and the third valve after the materials in the second crystallization tank reach the set capacity and the materials in the first crystallization tank are discharged, opening the first valve and repeating the steps, so that the crystallization operation of the first crystallization tank and the second crystallization tank is alternately realized, and the production requirement is met.

When the machine is stopped for maintenance, in order to avoid crystallization of residual materials in the pipeline, the third valve and the material conveying pump are closed, and the first valve is opened to enable the residual materials to flow back to the first crystallization tank.

For further with the residual material clean up in the pipeline, prevent its crystallization, close first valve, open fourth valve, fifth valve, introduce the pipeline with the secondary steam condensate water in, wash the pipeline through the steam condensate water and take out the residual material, get into through washing the delivery pipe and wash in the water collecting vat.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the pipeline is preheated and insulated by the arrangement of the steam jacket, so that the condition that the potassium dihydrogen phosphate concentrated solution blocks the pipeline in the pipeline due to cooling crystallization is avoided.

2. The first crystallization tank and the second crystallization tank are arranged at high and low positions, so that the pipeline is obliquely arranged, and potassium dihydrogen phosphate concentrated solution is stored in the pipeline as little as possible; meanwhile, the concentrated solution buffer tank and the valve are arranged, so that the alternate crystallization operation of the first crystallization tank and the second crystallization tank is realized, and the production efficiency and the productivity are improved.

3. Through the introduction of the secondary steam condensate water, the washing water collecting tank, the pipeline of the washing water collecting tank and the valve, the conveying pipeline is further cleaned through the secondary steam condensate water, residual materials in the conveying pipeline are cleaned up, and potassium dihydrogen phosphate concentrated solution is further prevented from crystallizing in the pipeline.

4. The concentrated solution is prevented from crystallizing by arranging the stirring paddle in the concentrated solution buffer tank; the tank body is cleaned regularly through the spray head.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic diagram of the installation of the steam jacket.

In the figure: 1-concentrated solution buffer tank, 2-material conveying pump, 3-first pipeline, 4-first valve, 5-second pipeline, 6-first crystallizing tank, 7-second valve, 8-third pipeline, 9-steam jacket, 10-heat preservation cotton, 11-second crystallizing tank, 12-third valve, 13-fourth valve, 14-secondary steam condensate pipe, 15-fifth valve, 16-washing water conveying pipe, 17-washing water collecting tank, 101-motor, 102-stirring paddle, 103-discharge port, 104-spray head and 105-sewage discharge port.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 shows a crystallization device for preventing potassium dihydrogen phosphate concentrate from blocking, wherein a concentrate buffer tank 1 is a hollow tank body, a motor 101 is arranged at the top of the concentrate buffer tank, an output shaft of the motor 101 is connected with a stirring paddle 102, the stirring paddle 102 is positioned in the tank body, a discharge hole 103 is arranged at the bottom of the concentrate buffer tank, and the discharge hole 103 is connected with a material conveying pump 2. The paddles 102 are intermittently activated to avoid crystallization of the concentrate in the tank. In order to conveniently clean the tank body when the machine is stopped or overhauled, the top of the concentrated solution buffer tank 1 is also provided with a spray head 104, the spray head 104 is connected with a washing water generating device, and the side wall of the bottom of the tank body is also provided with a drain outlet 105. In order to avoid long-term storage, cooling and crystallization of materials in the tank body, heat-preservation cotton 10 is attached to the outer side wall of the tank body.

The discharge gate 103 of concentrate buffer slot 1 passes through pipeline and 2 access connections of conveying pump, and the export of conveying pump 2 is connected with first pipeline 3, and 3 ends of first pipeline are provided with three way connection, and three way connection one end has connected gradually first valve 4, second pipeline 5 and first crystallizer tank 6, and the slope of second pipeline 5 sets up downwards. The other end of the three-way joint is sequentially connected with a second valve 7, a third pipeline 8, a third valve 12 and a second crystallizing tank 11. In order to avoid the concentrated solution accumulating in the pipeline, the joint of the third pipeline 8 and the third valve 12 is in an arc shape which is bent upwards. The first pipeline 3 and the third pipeline 8 are both arranged obliquely upwards, no horizontal segment is arranged on the first pipeline 3, the second pipeline 5 and the third pipeline 8, and the position of the second crystallization groove 11 is higher than that of the first crystallization groove 6.

In order to facilitate preheating and heat preservation of the pipeline, as shown in fig. 2, the outer side walls of the first pipeline 3, the second pipeline 5 and the third pipeline 8 are all sleeved with a steam jacket 9, the steam jacket 9 is connected with a steam generator, and heat preservation cotton 10 is attached to the outer side wall of the steam jacket 9.

Because the third pipeline 8 is long, the crystallization of materials in the pipeline is not avoided, and the inner wall of the pipeline is washed by introducing secondary steam condensate water (the temperature is about 80 ℃). A fourth valve 13 and a secondary steam condensate pipe 14 are sequentially connected at the joint of the third pipeline 8 and the third valve 12 through pipeline connecting pieces; the joint of the second valve 7 and the third pipeline 8 is sequentially connected with a fifth valve 15, a washing water delivery pipe 16 and a washing water collecting tank 17 through pipeline connecting pieces.

Before starting, steam is introduced into the steam jacket 9 to preheat a conveying pipeline, and the potassium dihydrogen phosphate concentrated solution in a high-temperature state is sent into the concentrated solution buffer tank 1 to be buffered and stored. After the start of the vehicle, the first valve 4 is opened, and the feed delivery pump 2 sends the potassium dihydrogen phosphate concentrated solution into the first crystallization tank 6 at a lower position through the second pipeline 5. After the material in the first crystallization tank 6 reaches the set volume, the first valve 4 is closed, the second valve 7 and the third valve 12 are opened, and the feed delivery pump 2 sends the potassium dihydrogen phosphate concentrated solution into the second crystallization tank 11 at a high position through the third pipeline 8. During the period, discharging the potassium dihydrogen phosphate concentrated solution after the crystallization in the first crystallization tank 6 is completed, closing the second valve 7 and the third valve 12 after the material in the second crystallization tank 11 reaches the set capacity and the material in the first crystallization tank 6 is discharged, opening the first valve 4 and repeating the steps, so that the crystallization operation is alternately realized in the first crystallization tank 6 and the second crystallization tank 11, and the production requirement is met.

When the machine is stopped for maintenance, in order to avoid crystallization of the residual materials in the pipeline, the third valve 12 and the material conveying pump 2 are closed, and the first valve 4 is opened to flow back to the first crystallizing tank 6.

In order to further clean up the residual materials in the pipeline and prevent the residual materials from crystallizing, the first valve 4 is closed, the fourth valve 13 and the fifth valve 15 are opened, secondary steam condensate water is introduced into the pipeline, the third pipeline 8 is washed by the steam condensate water to take the residual materials out, and the residual materials enter the washing water collecting tank 17 through the washing water conveying pipe 16.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. More particularly, various variations and modifications are possible in the component parts and/or arrangements within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims (6)

1. The utility model provides a crystallization device that potassium dihydrogen phosphate concentrate blockked up which characterized in that: the device comprises a concentrated solution buffer tank (1), a delivery pump (2) and a first pipeline (3) which are sequentially connected, wherein the first pipeline (3) is sequentially connected with a first valve (4), a second pipeline (5) and a first crystallization tank (6) through pipeline connecting pieces, and the first pipeline (3) is sequentially connected with a second valve (7), a third pipeline (8), a third valve (12) and a second crystallization tank (11) through pipeline connecting pieces; the outer side walls of the first pipeline (3), the second pipeline (5) and the third pipeline (8) are all sleeved with a steam jacket (9), the steam jacket (9) is connected with a steam generator, and heat insulation cotton (10) is attached to the outer side wall of the steam jacket (9); the first pipeline (3), the second pipeline (5) and the third pipeline (8) are all obliquely arranged and are not provided with horizontal sections; the second crystallization groove (11) is higher than the first crystallization groove (6).

2. The anti-clogging crystallization device for potassium dihydrogen phosphate concentrate according to claim 1, wherein: the joint of the third pipeline (8) and the third valve (12) is in an arc shape which is bent upwards.

3. The anti-clogging crystallization device for potassium dihydrogen phosphate concentrate according to claim 2, wherein: the joint of the third pipeline (8) and the third valve (12) is sequentially connected with a fourth valve (13) and a secondary steam condensate pipe (14) through a pipeline connecting piece; the joint of the second valve (7) and the third pipeline (8) is sequentially connected with a fifth valve (15), a washing water delivery pipe (16) and a washing water collecting tank (17) through a pipeline connecting piece.

4. The anti-clogging crystallization device for potassium dihydrogen phosphate concentrate according to claim 1, wherein: concentrated solution buffer tank (1) is the cavity cell body, and the top is provided with motor (101), and motor (101) output shaft has stirring rake (102), and stirring rake (102) are located the cell body, and the bottom is provided with discharge gate (103), and discharge gate (103) are connected with defeated material pump (2).

5. The anti-clogging crystallization device for potassium dihydrogen phosphate concentrate according to claim 4, wherein: the concentrated solution buffer tank (1) is characterized in that a spray head (104) is further arranged at the top of the concentrated solution buffer tank, the spray head (104) is connected with a washing water generating device, and a sewage draining outlet (105) is further formed in the side wall of the bottom of the tank body.

6. The crystallization apparatus according to claim 4 or 5, wherein the crystallization apparatus comprises: the outer side wall of the concentrated solution buffer tank (1) is attached with heat preservation cotton (10).

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