CN112110875A

CN112110875A - Preheating method for mother liquor in heavy material boiling section

Info

Publication number: CN112110875A
Application number: CN202011027928.0A
Authority: CN
Inventors: 周睿; 涂志远; 李广馨
Original assignee: Anhui Jinhe Industrial Co Ltd
Current assignee: Anhui Jinhe Industrial Co Ltd
Priority date: 2020-09-26
Filing date: 2020-09-26
Publication date: 2020-12-22

Abstract

The invention relates to a method for preheating mother liquor in a heavy knot material boiling working section, which comprises a heavy knot mother liquor tank, a heavy knot material boiling kettle and a coarse knot material bin, and is characterized in that: a plate heat exchanger is additionally arranged in front of the heavy knot mother liquid tank, and the mother liquid in the heavy knot mother liquid tank firstly exchanges heat with high-temperature condensate of a fluidized bed in a plate fluidized bed and then enters a heavy knot material boiling kettle; (1) preheating the heavy coagulation mother liquor to 80-85 ℃ by utilizing the high-temperature condensate of the fluidized bed through a plate heat exchanger; (2) adding the coarse sugar and the preheated coarse mother liquor into a coarse boiling kettle, and controlling the mass ratio of the coarse sugar to the coarse mother liquor to be 1-1.3: 1; (3) heating the materials in the heavy material cooking kettle to 90-95 ℃; the material is then pumped to the next station. The invention has the advantages that: the waste heat of the idle condensate is used for preheating the heavy mother liquor, so that a large amount of power consumption and steam are saved; the running time of the heavy knot circulating pump is shortened to 2-2.5h, and the frequency of machine seal damage is reduced; the production and processing capacity of the heavy caking process is improved, and the production efficiency is improved.

Description

Preheating method for mother liquor in heavy material boiling section

Technical Field

The invention belongs to the technical field of acesulfame potassium production, and relates to a preheating method of mother liquor in a heavy material cooking section.

Background

Acesulfame K (AK sugar) is a food additive, can increase the sweet taste of food, has good taste and no calorie, is not metabolized and absorbed in human body, and is an ideal sweetener for middle-aged and elderly people, obese patients and diabetic patients.

In the prior acesulfame potassium production process, during the heavy knot material boiling operation, coarse sugar (a coarse working section) and heavy knot mother liquor (crystallized mother liquor after heavy knot material boiling) are put into a kettle according to a solid-to-liquid ratio, then steam is opened to pass through a coil pipe in the kettle to heat materials in the kettle, the steam pressure is maintained at 1.5-2.0Kg, and the heavy knot single kettle material boiling time is about 2.5 hours; but the steam pressure fluctuation in the actual production is large, the steam pressure lower than 1.5Kg is normal, the heavy material boiling time is prolonged to 3-3.5 hours, and the production is not influenced when the yield task is light; however, as the yield of acesulfame potassium is gradually increased, the time for re-cooking the materials is long, and the production capacity is severely restricted.

Disclosure of Invention

The invention aims to solve the problems that the production capacity is limited due to large fluctuation of heating steam pressure and long time for re-knotting and boiling when the production yield of acesulfame potassium is large, and provides a method for preheating mother liquor in a re-knotting and boiling working section.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the utility model provides a method of preheating of material workshop section mother liquor is boiled in heavy knot, includes heavy knot mother liquor cistern, heavy knot and boils material cauldron, coarse knot feed bin, its characterized in that: a plate heat exchanger is additionally arranged in front of the heavy knot mother liquid tank, and the mother liquid in the heavy knot mother liquid tank firstly exchanges heat with high-temperature condensate of a fluidized bed in a plate fluidized bed and then enters a heavy knot material boiling kettle;

the method comprises the following steps:

(1) preheating the heavy coagulation mother liquor (15-25 ℃) to 80-85 ℃ by utilizing the high-temperature condensate of the fluidized bed through a plate heat exchanger;

(2) adding the coarse sugar and the preheated coarse mother liquor into a coarse boiling kettle, and controlling the mass ratio of the coarse sugar to the preheated coarse mother liquor to be 1-1.3: 1;

(3) starting a heavy knot circulating pump and steam, and heating the materials in the heavy knot material boiling kettle to 90-95 ℃; and then pumping the material into the next section by using a heavy knot material-pumping pump.

Further, the temperature in the re-sintering boiling kettle in the step (3) is 90-93 ℃.

The invention has the advantages that: the heavy mother liquor is preheated by using the waste heat of the idle condensate, so that the material boiling time of each kettle is effectively reduced, and a large amount of power consumption and steam are saved; the running time of the heavy knot circulating pump is shortened (to 2-2.5 h), the frequency of machine seal damage is reduced, the machine material cost is saved, and the overhauling labor intensity of first-line maintenance personnel is reduced; the production and processing capacity of the heavy knot process is increased, the production efficiency is improved, and the stability and the continuity of production are improved.

Drawings

FIG. 1 is a schematic diagram of a process for preheating mother liquor in a heavy boiling section;

FIG. 2 is a flow chart of a heavy material cooking section in the existing acesulfame potassium production process.

Detailed Description

The invention is further illustrated with reference to fig. 1:

a preheating device for mother liquor in a heavy material boiling section comprises: the heavy knot mother liquid tank and the coarse knot bin are respectively connected with an inlet of the heavy knot material boiling kettle through a pipeline (containing a control valve); a pipeline (containing a control valve) is arranged on a pipeline between the heavy knot mother liquid tank and the heavy knot material boiling kettle, the pipeline is connected to an inlet of the plate heat exchanger through a circulating pump II, and an outlet of the plate heat exchanger is connected to the heavy knot mother liquid tank through a pipeline; the inlet of the plate type heat exchanger is connected with the outlet of the high-temperature condensate tank through a first circulating pump, and the outlet of the plate type heat exchanger is connected with the inlet of the deionized water tank through a pipeline.

A preheating method of mother liquor in a heavy material cooking section comprises the following specific implementation steps:

example 1

(1) Recovering the fluidized bed high-temperature steam condensate (3 m, 90 ℃) to a high-temperature condensate liquid groove, pumping the liquid in the high-temperature condensate liquid groove into a plate type heat exchanger by using a first circulating pump, pumping the heavy knot mother liquid (3 m for cultivation, 15 ℃) in the heavy knot mother liquid groove into the plate type heat exchanger by using a second circulating pump, preheating the heavy knot mother liquid to 85 ℃ (time consumption of 0.5 h) in the plate type heat exchanger, and pumping the heavy knot mother liquid after heat exchange back to the heavy knot mother liquid groove for later use;

(2) respectively throwing 3200kg of coarse sugar and the heavy knot mother liquor preheated by 3m into a heavy knot material boiling kettle, starting a heavy knot circulating pump and steam (steam pressure is 1.5 kg), performing heavy knot material boiling operation, after the heavy knot material boiling is carried out for 2.2h, driving the material in the heavy knot material boiling kettle into the next working section, wherein the temperature of the heavy knot material boiling reaches 90.5 ℃.

Example 2

(1) Recovering the fluidized bed high-temperature steam condensate (3 m, 95 ℃) to a high-temperature condensate liquid groove, pumping the liquid in the high-temperature condensate liquid groove into a plate type heat exchanger by using a first circulating pump, pumping the heavy knot mother liquid (3.2 m, 15 ℃) in the heavy knot mother liquid groove into the plate type heat exchanger by using a second circulating pump, preheating the heavy knot mother liquid to 85 ℃ (consuming time for 0.6 h) in the plate type heat exchanger, and pumping the heavy knot mother liquid after heat exchange back to the heavy knot mother liquid groove for later use;

(2) 3500kg of coarse sugar and 3.2m heavy harvest preheated heavy knot mother liquor are respectively thrown into a heavy knot material boiling kettle, a heavy knot circulating pump and steam (steam pressure is 1.5 kg) are started for heavy knot material boiling operation, the temperature of the heavy knot material boiling kettle reaches 95 ℃ after the heavy knot material boiling is carried out for 2.5h, and the material in the heavy knot material boiling kettle is thrown into the next working section.

Heating a tank 4m³The mother liquor (calculated as 4000 Kg) rises from 20 ℃ to 85 ℃ and the heat consumption is: 4000Kg (85-20) ° c =260000 kcal, i.e. 260000Kg cal of heat, steam is consumed (steam pressure is 2Kg, steam temperature is 130 ℃): 260000/(130-20) =2363Kg ≈ 2.36T (steam); the steam (2 Kg) can be saved by boiling 9 kettles of materials every day in 30 days in one month: 2.36 × 9 × 30 ≈ 637T, saving costs for one month: 637T 200/T = 127400.

The time saved by the reformed single heavy knot material boiling kettle is calculated according to 1.5h, the power of a material circulating pump of the heavy knot material boiling kettle is 22KW, 1 pipeline pump of 1.5KW and a 5.0KW circulating pump are needed for preheating a tank of heavy knot mother liquor, and the circulation is carried out for 0.7 h; the material boiling 9 kettles are knotted one day, the mother liquor preheating 9 grooves are knotted, the electricity can be saved in one month (calculated according to 30 days): (1.5 × 22 × 9-1.5 × 0.7 × 9-5 × 0.7 × 9) × 30=7681.5 degrees, i.e. saving costs: 7681.5 degrees x 0.8 yuan/degree =6145.2 yuan.

Claims

1. The utility model provides a method of preheating of material workshop section mother liquor is boiled in heavy knot, includes heavy knot mother liquor cistern, heavy knot and boils material cauldron, coarse knot feed bin, its characterized in that: a plate heat exchanger is additionally arranged in front of the heavy knot mother liquid tank, and the mother liquid in the heavy knot mother liquid tank firstly exchanges heat with high-temperature condensate of a fluidized bed in a plate fluidized bed and then enters a heavy knot material boiling kettle;

the method comprises the following steps:

(1) preheating the heavy coagulation mother liquor to 80-85 ℃ by utilizing the high-temperature condensate of the fluidized bed through a plate heat exchanger;

(3) heating the materials in the heavy material cooking kettle to 90-95 ℃; the material is then pumped to the next station.

2. The method for preheating the mother liquor in the heavy material cooking section as claimed in claim 1, is characterized in that: the temperature of the rejointing mother liquor in the step (1) is 15-25 ℃.

3. The method for preheating the mother liquor in the heavy material cooking section according to claim 1 or 2, is characterized in that: the temperature in the re-sintering boiling kettle in the step (3) is 90-93 ℃.