Drying device for monopotassium phosphate production
Through the combination of a four-effect concentration evaporator and a dual-wheel dryer, the potassium dihydrogen phosphate material liquid is directly dried, which solves the problems of long routes and high energy consumption in the prior art, and achieves high efficiency and low energy consumption Drying effect.
Patent Information
- Application Number
- CN202420926347.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-04-29
AI Technical Summary
The existing potassium dihydrogen phosphate drying process has long routes and high energy consumption, which increases production costs.
Using a drying device including a four-effect concentrated evaporator and a dual-wheel dryer, the material liquid is concentrated through a four-effect concentrated evaporator and directly drying the double-wheel, eliminating the intermediate crystal centrifugal link, combining condensate recovery and preheating. Treatment to reduce energy consumption.
The process flow is shortened, energy consumption is reduced, and the drying efficiency is improved, achieving high-efficiency drying of potassium dihydrogen phosphate.
Smart Images
Figure CN222341984U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of drying devices, in particular to a drying device for producing potassium dihydrogen phosphate. Background Art
[0002] The process of producing potassium dihydrogen phosphate usually includes a drying process. The commonly used drying process is to concentrate the potassium dihydrogen phosphate liquid, crystallize and centrifuge it after concentration, and then dry the solid after centrifugation to obtain the finished potassium dihydrogen phosphate. The above drying process has a long route and high energy consumption, which increases the drying cost of potassium dihydrogen phosphate. In view of the above problems, it is necessary to provide a drying device with a short route and low energy consumption. Utility Model Content
[0003] The technical problem to be solved by the utility model is: in view of the deficiencies in the prior art, a drying device for producing potassium dihydrogen phosphate is provided, which has high drying efficiency, shortens the process flow and has low energy consumption.
[0004] In order to solve the above technical problems, the technical solution of the utility model is:
[0005] A drying device for producing potassium dihydrogen phosphate, comprising a four-effect concentrating evaporator and a double-rotor dryer;
[0006] The double-rotor dryer comprises a first roller and a second roller with opposite rotation directions, a spraying plate is arranged above the first roller and the second roller, and the spraying plate is connected with the discharge port of the four-effect concentrating evaporator through a pipeline; a receiving plate is arranged below the first roller and the second roller; and the first scraper and the second scraper are respectively abutted against the first roller and the second roller, and a first screw conveyor and a second screw conveyor are also arranged on both sides of the first roller and the second roller; the first roller and the second roller are hollow structures and are connected with the first steam pipeline, and a protective cover is also arranged above the first roller and the second roller, and the protective cover is connected with a mixing condenser through a pipeline, and the mixing condenser is also connected with a gas-liquid separator and a vacuum pump in sequence.
[0007] As a preferred technical solution, the four-effect concentrating evaporator includes a first-effect evaporator, a first-effect separator, a second-effect evaporator, a second-effect separator, a third-effect evaporator, a third-effect separator, a fourth-effect evaporator and a fourth-effect separator; the feed inlet of the fourth-effect evaporator is connected to a potassium dihydrogen phosphate liquid storage tank, and the heat exchange medium inlet and heat exchange medium outlet of the first-effect evaporator are respectively connected to a second steam pipeline and a condensed water storage tank.
[0008] As a preferred technical solution, it also includes a concentrated liquid storage tank, wherein the liquid inlet and the liquid outlet of the concentrated liquid storage tank are respectively connected to the liquid outlet of the first-effect separator and the spray plate.
[0009] As a preferred technical solution, the potassium dihydrogen phosphate liquid storage tank is connected to the four-effect evaporator through a heat exchanger, and the heat exchange medium inlet of the heat exchanger is connected to the condensed water storage tank.
[0010] As a preferred technical solution, the gas outlet of the condensed water storage tank is connected to the inner cavity of the first roller and the second roller.
[0011] As a preferred technical solution, the gas outlet of the four-effect separator is connected to the mixing condenser.
[0012] As a preferred technical solution, a cooling water spray head is provided on the top of the mixing condenser, and a liquid distribution pan is provided below the cooling water spray head.
[0013] As a preferred technical solution, it also includes a support frame, which includes support legs and a support plate arranged on the support legs, and one end of the first scraper and the second scraper is arranged on the support plate.
[0014] As a preferred technical solution, a material guide plate is provided at the feed inlet of the first screw conveyor and the second screw conveyor; one end of the material guide plate extends above the material receiving tray.
[0015] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:
[0016] The drying device includes a four-effect concentrating evaporator, a concentrated liquid storage tank and a double-rotor dryer. After the potassium dihydrogen phosphate liquid is concentrated by the four-effect concentrating evaporator, it is directly dried by the double-rotor dryer, which eliminates the intermediate crystallization centrifugation link, shortens the process flow and reduces energy consumption.
[0017] The feed inlet of the four-effect evaporator of the device is connected to the heat exchanger and the potassium dihydrogen phosphate liquid storage tank, and the heat exchange medium inlet and heat exchange medium outlet of the first-effect evaporator are respectively connected to the second steam pipeline and the condensate storage tank; the heat exchange medium inlet of the heat exchanger is connected to the condensate storage tank. Through the above settings, the condensate generated during the evaporation process can be recovered and the potassium dihydrogen phosphate liquid can be preheated, further reducing energy consumption.
[0018] The gas outlet and protective cover of the four-effect separator of the device are connected to the mixing condenser, gas-liquid separator and vacuum pump in sequence; a cooling water spray head is provided on the top of the mixing condenser, and a liquid distribution tray is provided below the cooling water spray head. Through the above arrangement, the gas separated by the four-effect separator and the gas evaporated during drying by the double rotary dryer enter the mixing condenser and are sprayed and absorbed by cooling water, and the gas not absorbed enters the gas-liquid separator for separation, and the separated gas is subjected to tail gas treatment.
[0019] In the device, the first screw feeder and the second screw feeder are both provided with a material guide plate at the feed inlet; one end of the material guide plate extends above the material receiving tray, thereby improving the collection efficiency of the potassium dihydrogen phosphate material. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0021] Figure 1 It is a schematic diagram of the structure of Embodiment 1 of the present utility model;
[0022] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at A in the middle;
[0023] Figure 3 is a schematic diagram of the internal structure of the first roller;
[0024] In the figure, 1, first-effect evaporator; 2, first-effect separator; 3, second-effect evaporator; 4, second-effect separator; 5, triple-effect evaporator; 6, triple-effect separator; 7, fourth-effect evaporator; 8, fourth-effect separator; 9, concentrate storage tank; 10, heat exchanger; 11, potassium dihydrogen phosphate liquid storage tank; 12, second steam pipeline; 13, condensate storage tank; 14, mixing condenser; 15, gas-liquid separator; 16, vacuum pump; 17, cooling water spray head; 18, liquid distribution tray; 19, first roller; 20, second roller; 21, spray tray; 22, receiving tray; 23, first scraper; 24, second scraper; 25, first screw conveyor; 26, second screw conveyor; 27, support frame; 28, support leg; 29, support plate; 30, first steam pipeline; 31, protective cover; 32, guide plate. DETAILED DESCRIPTION
[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.
[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0027] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.
[0028] Example 1
[0029] like Figures 1 to 3 As shown, a drying device for producing potassium dihydrogen phosphate includes a four-effect concentrating evaporator, a concentrated liquid storage tank 9 and a double rotary dryer;
[0030] like Figure 1 As shown, the four-effect concentrating evaporator comprises a first-effect evaporator 1, a first-effect separator 2, a second-effect evaporator 3, a second-effect separator 4, a third-effect evaporator 5, a third-effect separator 6, a fourth-effect evaporator 7 and a fourth-effect separator 8; the liquid outlet of the first-effect separator 2 is connected to a concentrated liquid storage tank 9; the feed port of the fourth-effect evaporator 7 is connected to a heat exchanger 10 and a potassium dihydrogen phosphate liquid storage tank 11, the heat exchange medium inlet and the heat exchange medium outlet of the first-effect evaporator 1 are respectively connected to a second steam pipeline 12 and a condensed water storage tank 13; the heat exchange medium inlet of the heat exchanger 10 is connected to the condensed water storage tank 13. The fourth-effect evaporator 7 concentrates the liquid 11 in the potassium dihydrogen phosphate liquid storage tank, and steam is used for heating during the concentration and evaporation process. The condensed water formed after the heat exchange enters the condensed water storage tank 13 for collection, and enters the heat exchanger 10 as a heat exchange medium to preheat the potassium dihydrogen phosphate liquid, thereby realizing wastewater recycling and further reducing the drying energy consumption of potassium dihydrogen phosphate.
[0031] In this device, the gas outlet of the four-effect separator 8 is connected to the mixing condenser 14 and the gas-liquid separator 15 in sequence, and the gas outlet of the gas-liquid separator 15 is connected to the vacuum pump 16; a cooling water spray head 17 is provided on the top of the mixing condenser 14, and a liquid distribution tray 18 is provided below the cooling water spray head 17. The gas evaporated during the concentration process is separated by the four-effect separator 8 and enters the mixing condenser 14 to be sprayed and absorbed by cooling water, and the gas that is not absorbed enters the gas-liquid separator 15 for separation, and the separated gas is subjected to tail gas treatment.
[0032] like Figure 1 , Figure 2 and Figure 3As shown together, the double-rotor dryer includes a first roller 19 and a second roller 20 with opposite rotation directions, a spray plate 21 is provided above the first roller 19 and the second roller 20, and the spray plate is connected to the concentrate storage tank 9; a receiving plate 22 is provided below the first roller 19 and the second roller 20; it also includes a first scraper 23 and a second scraper 24 respectively abutting against the first roller 19 and the second roller 20, and a first screw conveyor 25 and a second screw conveyor 26 are also provided on both sides of the first roller 19 and the second roller 20; it also includes a support frame 27, the support frame 27 includes a support leg 28 and a support plate 29 arranged on the support leg 28, one end of the first scraper 23 and the second scraper 24 is arranged on the support plate 29; the first roller 19 and the second roller 20 are hollow structures and are connected to the first steam pipe 30, and the inner cavity of the first roller 19 and the second roller 20 is also connected to the gas outlet of the condensate storage tank 13. Steam is introduced into the first roller 19 and the second roller 20 through the first steam pipe 30 to heat the first roller 19 and the second roller 20, and the concentrated potassium dihydrogen phosphate is sprayed onto the heated surfaces of the first roller 19 and the second roller 20 through the spraying plate 21 for drying. Under the rotation of the first roller 19 and the second roller 20, the first scraper 23 and the second scraper 24 scrape off the dry materials adhering to the surfaces of the first roller 19 and the second roller 20, and the scraped materials enter the first screw conveyor 25 and the second screw conveyor 26 and are transported to the packaging workshop. The setting of the receiving plate 22 can effectively collect the missed dry materials.
[0033] Furthermore, a protective cover 31 is provided above the first roller 19 and the second roller 20, and the protective cover 31 is connected to the mixing condenser 14 through a pipeline. The gas evaporated during the drying process enters the mixing condenser 14 through the protective cover 31 for absorption, and the unabsorbed gas enters the gas-liquid separator 15 for separation, and the separated gas is subjected to tail gas treatment.
[0034] Furthermore, in this embodiment, a material guide plate 32 is provided at the feed inlet of the first screw conveyor 25 and the second screw conveyor 26; one end of the material guide plate 32 extends above the receiving tray 22, thereby improving the collection efficiency of the potassium dihydrogen phosphate material.
[0035] In addition, it should be understood that after reading the contents taught in the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.
Claims
1. A drying device for producing potassium dihydrogen phosphate, characterized in that: It includes a four-effect concentrating evaporator and a double rotary dryer; The double-rotor dryer comprises a first roller and a second roller with opposite rotation directions, a spraying plate is arranged above the first roller and the second roller, and the spraying plate is connected with the discharge port of the four-effect concentrating evaporator through a pipeline; a receiving plate is arranged below the first roller and the second roller; and the first scraper and the second scraper are respectively abutted against the first roller and the second roller, and a first screw conveyor and a second screw conveyor are also arranged on both sides of the first roller and the second roller; the first roller and the second roller are hollow structures and are connected with the first steam pipeline, and a protective cover is also arranged above the first roller and the second roller, and the protective cover is connected with a mixing condenser through a pipeline, and the mixing condenser is also connected with a gas-liquid separator and a vacuum pump in sequence.
2. A drying device for producing potassium dihydrogen phosphate according to claim 1, characterized in that: The four-effect concentrating evaporator includes a first-effect evaporator, a first-effect separator, a second-effect evaporator, a second-effect separator, a third-effect evaporator, a third-effect separator, a fourth-effect evaporator and a fourth-effect separator; the feed inlet of the fourth-effect evaporator is connected to a potassium dihydrogen phosphate liquid storage tank, and the heat exchange medium inlet and the heat exchange medium outlet of the first-effect evaporator are respectively connected to a second steam pipeline and a condensed water storage tank.
3. A drying device for producing potassium dihydrogen phosphate according to claim 2, characterized in that: The gas outlet of the condensed water storage tank is communicated with the inner cavities of the first roller and the second roller.
4. A drying device for producing potassium dihydrogen phosphate according to claim 2, characterized in that: It also includes a concentrated liquid storage tank, wherein the liquid inlet and the liquid outlet of the concentrated liquid storage tank are respectively connected to the liquid outlet of the first-effect separator and the spraying plate.
5. A drying device for producing potassium dihydrogen phosphate according to claim 2, characterized in that: The potassium dihydrogen phosphate liquid storage tank is connected to the four-effect evaporator through a heat exchanger, and the heat exchange medium inlet of the heat exchanger is connected to the condensed water storage tank.
6. A drying device for producing potassium dihydrogen phosphate according to claim 2, characterized in that: The gas outlet of the four-effect separator is communicated with the mixing condenser.
7. A drying device for producing potassium dihydrogen phosphate according to claim 1, characterized in that: A cooling water spray head is arranged on the top of the mixing condenser, and a liquid distribution pan is arranged below the cooling water spray head.
8. A drying device for producing potassium dihydrogen phosphate according to claim 1, characterized in that: It also includes a support frame, which includes support legs and a support plate arranged on the support legs, and one end of the first scraper and the second scraper is arranged on the support plate.
9. A drying device for producing potassium dihydrogen phosphate according to claim 1, characterized in that: A material guide plate is provided at the feed inlet of the first screw conveyor and the second screw conveyor; one end of the material guide plate extends above the material receiving tray.