CN101836703B

CN101836703B - Sugar manufacturing and clearing process for preventing scale formation of evaporating pot and reducing ash content of white granulated sugar

Info

Publication number: CN101836703B
Application number: CN200910300886A
Authority: CN
Inventors: 李利军; 黄永春; 杨锋
Original assignee: Guangxi University of Science and Technology
Current assignee: Guangxi University of Science and Technology
Priority date: 2009-03-16
Filing date: 2009-03-16
Publication date: 2012-10-24
Anticipated expiration: 2029-03-16
Also published as: CN101836703A

Abstract

The invention relates to a sugar manufacturing and clearing process for preventing scale formation of an evaporating pot and reducing ash content of white granulated sugar, which is suitable for a clearing process of a sulfurous acid method. The process sequentially comprises the working procedures of preliming, heating for the first time, neutralizing by sulphur fumigation, heating for the second time and depositing, wherein SO2 gas added in the working procedure of neutralizing by sulphur fumigation is purified, and SO2 gas containing SO3 is removed. In the method for purifying SO2 gas, SO2 gas which is cooled to about 80 DEG C and contains SO3 is introduced into a closed container containing water or an absorption tower containing spray water, SO3 reacts with water to generate H2SO4 which has very large solubility and can not be volatilized easily, and because the solubility of SO2 in water is very low, SO2 quickly achieves saturation and then overflows, thereby obtaining SO2 gas in which SO3 is removed. The method can effectively remove SO3 contained in SO2 gas, greatly reduces the generation of CaSO4, and has a positive prevention effect on preventing scale formation and reducing ash content of finished product sugar.

Description

A kind of clarification process of sugar production of avoid evaporating jar fouling and reduction ash content of white granulated

Technical field:

The present invention relates to a kind of method for manufacturing sugar, relate in particular to a kind of clarification process of sugar production that is applicable to sulfurous method.

Background technology:

Adopt the sulfurous method clarification process of sugar production cane sugar factory (hereinafter to be referred as: inferior method sugar refinery) use finingss such as lime, sulfurous gas, phosphoric acid in process of production in a large number, remove non-sugars such as colloid in the sugarcane juice, pigment to form various calcium precipitations absorption.The SO that use in sugar refinery ₂Basically all be the method acquisition through sulfur burning, this method is at preparation SO ₂The time produce SO more or less ₃Mixing juice is residual inevitably a certain amount of Ca in the clear juice that clarification process such as stove drying neutralization, sedimentation obtain ²⁺, SO ₄ ^2-, SO ₃ ^2-, PO ₄ ^3-Plasma, these ions are in evaporating concentration process, and crystallization is separated out gradually becomes incrustation; Be deposited on the heating tube wall in the evaporating pot; Have a strong impact on its heat transfer efficiency and evaporation capacity, reduce sugar refinery production efficiency, shorten service life of equipment, be the technical barrier in puzzlement sugar refinery always.

Have a strong impact on to what production brought for overcoming evaporating pot incrustation, the scientific worker is making great efforts to seek a kind of effective antiscale measure always.Once carried out physics method antiscale such as EM field, UW for many years and added the research and experiment of chemical scale inhibition agent antiscale, all because equipment cost is high, working cost greatly, be difficult to the not large-scale promotion use as yet so far of reasons such as control, result of use instability.

Sugar refinery mainly adopts water blast gun that evaporating pot is rotated cleaning and descaling at present, and not only labour intensity is big, and has certain potential safety hazard.

Research shows, CaSO ₄Be the main chemical compositions of inferior method sugar refinery evaporating pot incrustation, this material also is the staple of ash content in the white sugar simultaneously.Therefore reduce CaSO as much as possible ₄Generation be anti-incrustation, the important channel that reduces the commerieal sugar ash content.Form the small amount of impurities of sulfate radical in deriving from sugarcane itself and phosphoric acid of this material the SO that mainly uses from sugar refinery ₂The SO that contains in the gas ₃If can remove SO effectively ₂The SO that contains in the gas ₃, can reduce CaSO widely ₄Generation, to anti-incrustation, reduce the commerieal sugar ash content important effect is arranged.

Summary of the invention:

The technical problem that the present invention will solve is: provide a kind of and can prevent the evaporating pot fouling of inferior method sugar refinery and reduce ash content of white granulated " a kind of clarification process of sugar production of avoid evaporating jar fouling and reduction ash content of white granulated " that this method can be removed SO effectively ₂The SO that contains in the gas ₃, can reduce CaSO widely ₄Generation, to anti-incrustation, reduce the commerieal sugar ash content and play the active prevention effect.

The technical scheme that solves the problems of the technologies described above is: a kind of clarification process of sugar production of avoid evaporating jar fouling and reduction ash content of white granulated; Be applicable to traditional sulfurous method clarification process; Comprise the preparatory ash that carries out successively, once heating, stove drying neutralization, second-heating and sedimentation operation, in said stove drying with operation in the SO that adds ₂Gas is through purifying treatment, has removed the SO that wherein contains ₃Gas.

Its further technical scheme is: the SO that in stove drying and in the operation, adds ₂The gas cleaning treatment process is: will be cooled to about 80 ℃, contain SO ₃SO ₂Gas feeds in the encloses container that water is housed and thorough mixing, SO ₃Meet the water reaction and generate H ₂SO ₄, its solubleness is very big and not volatile, and SO2 overflows after reaching capacity fast because the solubleness in water is very low.

The said SO that in stove drying and in the operation, adds ₂The gas cleaning treatment process can also be: will contain SO ₃SO ₂Gas feeds in the absorption column of gas, is absorbed liquid and grabs water absorption, SO ₃Meet the water reaction and generate H ₂SO ₄, its solubleness is very big and not volatile, SO ₂Overflow after reaching capacity fast because the solubleness in water is very low.

Owing to adopt technique scheme, a kind of clarification process of sugar production that avoids evaporating jar fouling and reduction ash content of white granulated of the present invention has following beneficial effect:

1, can remove SO effectively ₂The SO that contains in the gas ₃, can reduce CaSO widely ₄Generation.

The SO that the inventive method will add in stove drying and in the operation ₂Gas at first passes through cleaning, has removed SO effectively ₂The SO that contains in the gas ₃, can reduce CaSO widely ₄Generation, thereby prevented the CaSO that can cause the evaporating pot fouling and produce ash content of white granulated from the source ₄Forming factors; Through trial run, for the pending sugarcane juice of concentration of the same race, if adopt clarification process of the present invention, will be in stove drying and the SO that adds in the operation ₂Gas is at first through purifying treatment and the existing SO that adds without purifying treatment ₂The technology of gas is compared, and its incrustation reduces more than 82%, and the white sugar ash content reduces more than 31%.

2, save time, laborsaving, cost is low, good environmental protection.

As stated, the inventive method has been removed SO effectively ₂The SO that contains in the gas ₃, can reduce CaSO widely ₄Generation, thereby prevented the CaSO that can cause the evaporating pot fouling and produce ash content of white granulated from the source ₄Forming factors, with adopt water blast gun that evaporating pot is rotated cleaning and descaling to compare, save time, laborsaving; With present evaporating pot fouling CaSO to having produced ₄Adopt the method for physics method antiscale and the agent of interpolation chemical scale inhibition to compare, working cost descends greatly, and, need not add the chemical scale inhibition agent, good environmental protection.

3, be convenient to existing technology is transformed.

The SO that existing explained hereafter goes out ₂The SO that contains in the gas ₃Than higher, if adopt the inventive method, need not carry out big change to existing old technology, only need SO to adding in the stove drying neutralization reaction operation ₂Gas carries out purifying treatment earlier and gets final product, and is economical and practical.

Below, the technical characterictic that the present invention a kind of is avoided evaporating jar fouling and reduce the sugar clarification technique method of ash content of white granulated in conjunction with accompanying drawing and embodiment is further described.

Description of drawings:

Fig. 1: the process flow diagram of the sugar clarification technique method of the present invention's a kind of avoid evaporating jar fouling and reduction ash content of white granulated;

Fig. 2-1～Fig. 2-2: in the sugar clarification technique method of a kind of avoid evaporating jar fouling and reduction ash content of white granulated according to the invention, a kind of purification SO ₂The structural representation of the vortex device of gas:

Fig. 2-1 is horizontal, and Fig. 2-2 is vertical;

Fig. 3: in the sugar clarification technique method of the embodiment of the invention said a kind of avoid evaporating jar fouling and reduction ash content of white granulated, purify SO ₂The absorption tower device synoptic diagram that gas adopts.

Embodiment:

A kind of clarification process of sugar production of avoid evaporating jar fouling and reduction ash content of white granulated; Be applicable to traditional sulfurous method clarification process; It comprises the preparatory ash that carries out successively, once heating, stove drying neutralization, second-heating and sedimentation operation, in said stove drying with operation in the SO that adds ₂Gas is through purifying treatment, has removed the SO that wherein contains ₃SO ₂Gas.

The SO of present embodiment in stove drying and in the operation, adding ₂The purifying treatment method that gas adopts is: the SO that contains that will be cooled to (that is: 70～90 ℃) about 80 ℃ ₃SO ₂Gas feeds in the encloses container that water is housed (referring to Fig. 2-1～Fig. 2-2), and vigorous stirring, SO ₃Meet the water reaction and generate H ₂SO ₄, its solubleness is very big and not volatile, and SO2 overflows after reaching capacity fast to become because the solubleness in water is very low and has removed the SO that wherein contains ₃SO ₂Gas; Fig. 2-1 is described to be a kind of container that can make the water vigorous stirring, can produce eddy current, comprise sealed at both ends horizontal cylindrical drum 3a, be installed in the rotating shaft 4a of band blade 4a1 in the cylindrical drum, the middle and upper part of cylindrical drum one end is provided with pending SO ₂Gas inlet 1a and clean water inlet 2a, the middle and upper part of the cylindrical drum the other end is provided with purifying treatment SO ₂ Pneumatic outlet 5a, H is arranged at the bottom of this cylindrical drum ₂SO ₄Wastewater outlet 7a, the cylindrical drum inwall has corrosion-resistant coating 3a1;

What Fig. 2-2 showed is a kind of vertical enclosed container that produces eddy current or rotary water current, it comprise upper-lower seal vertical and cylindrical cylindrical shell 3b, be installed in the rotating shaft 4b of band blade 4b1 in the cylindrical drum, the middle and upper part of cylindrical drum one end is provided with pending SO ₂Gas inlet 1b and clean water inlet 2b, the middle and upper part of the cylindrical drum the other end is provided with purifying treatment SO ₂ Pneumatic outlet 5b, H is arranged at the bottom of this cylindrical drum ₂SO ₄Wastewater outlet 7b, the cylindrical drum inwall has corrosion-resistant coating 3b1, and among Fig. 2-1 and Fig. 2-2,6a, 6b are the rotating shaft drive units.

As a kind of conversion of the embodiment of the invention, said can to make the sealed vessel of water vigorous stirring can also be the container of other shapes or structure.

As another conversion of the embodiment of the invention, said SO in stove drying and in the operation, adding ₂The gas cleaning treatment process can also be: with unprocessed, contain SO ₃SO ₂Gas feeds in the absorption column of gas, is absorbed SO by the spray water from the cat head ejection ₃Meet the water reaction and generate H ₂SO ₄, its solubleness is very big and not volatile, SO ₂Overflow after reaching capacity fast to become because solubleness in water is very low and removed the SO that wherein contains ₃SO ₂Gas.Absorption column of gas 9 structures are as shown in Figure 3, comprise shell 91, protection against corrosion internal layer 92, and cat head top is equipped with spray water shower nozzle 10, and the middle and upper part of body of the tower remains treatment S O ₂There is purifying treatment SO gas inlet 8, the top of body of the tower ₂ Pneumatic outlet 11, wastewater outlet 12 is arranged at the body of the tower bottom.

Claims

1. jar fouling and reduce the clarification process of sugar production of ash content of white granulated of avoiding evaporating; Be applicable to traditional sulfurous method clarification process; Comprise the preparatory ash that carries out successively, once heating, stove drying neutralization, second-heating and sedimentation operation, it is characterized in that: in stove drying with operation in the SO that adds ₂Gas is through purifying treatment, has removed the SO that wherein contains ₃SO ₂Gas.

2. the clarification process of sugar production of a kind of avoid evaporating jar fouling and reduction ash content of white granulated according to claim 1 is characterized in that: the SO that in stove drying and in the operation, adds ₂The gas cleaning treatment process is: will be cooled to 70-90 ℃, contain SO ₃SO ₂Gas feeds in the encloses container that water is housed and thorough mixing, SO ₃Meet the water reaction and generate H ₂SO ₄, its solubleness is very big and not volatile, SO ₂Overflow after reaching capacity fast to become because solubleness in water is very low and removed the SO that wherein contains ₃SO ₂Gas.

3. the clarification process of sugar production of a kind of avoid evaporating jar fouling and reduction ash content of white granulated according to claim 1 is characterized in that: the SO that in stove drying and in the operation, adds ₂The gas cleaning treatment process is: will contain SO ₃SO ₂Gas feeds in the absorption column of gas and is absorbed SO by spray water ₃Meet the water reaction and generate H ₂SO ₄, its solubleness is very big and not volatile, SO ₂Overflow after reaching capacity fast to become because solubleness in water is very low and removed the SO that wherein contains ₃SO ₂Gas.