WO2016056021A1 - Utilisation of low grade heat for juice concentration - Google Patents

Utilisation of low grade heat for juice concentration Download PDF

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Publication number
WO2016056021A1
WO2016056021A1 PCT/IN2015/000377 IN2015000377W WO2016056021A1 WO 2016056021 A1 WO2016056021 A1 WO 2016056021A1 IN 2015000377 W IN2015000377 W IN 2015000377W WO 2016056021 A1 WO2016056021 A1 WO 2016056021A1
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WO
WIPO (PCT)
Prior art keywords
steam
concentration
cane
juice
low pressure
Prior art date
Application number
PCT/IN2015/000377
Other languages
French (fr)
Inventor
Vivek Verma
Original Assignee
Vivek Verma
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vivek Verma filed Critical Vivek Verma
Publication of WO2016056021A1 publication Critical patent/WO2016056021A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
    • A23L2/02—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation containing fruit or vegetable juices
    • A23L2/08—Concentrating or drying of juices
    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B25/00—Evaporators or boiling pans specially adapted for sugar juices; Evaporating or boiling sugar juices

Definitions

  • a novel approach for utilization of low pressure vapors or steam typically in the range of 0.05 to 0.25 bar absolute pressure to concentrate cane or beet juice instead of discarding to the atmosphere.
  • the sources of these low grade vapors or steam in sugar plant are turbines exhaust, pans and evaporators vapors, and similar devices in the present invention.
  • the steam-heated evaporator or thickener is especially suitable for sea water or sugar beet juice. Its plate heat exchangers accept pre- distributed fluid flow from above, which falls as a film on the inner surfaces of vertical channels within, hence being heated in cross- and counter-current flow.
  • Patent No. US 20070151840A1 entitled 'Method and device for treating water' is a multi-effect falling-film evaporator, purified water for special purposes.
  • a steam phase and water phase is produced from the feed water.
  • the steam phase is used for heating in the subsequent effect, whereby it condenses to product water, and the water phase becomes the feed stream for the subsequent effect.
  • Patent No. US 699038A entitled 'Multiple Effect' relates "to improvements in multiple effects for the evaporation or concentration of liquids or solutions in which the vapor of each preceding effect is used for the further evaporation in each succeeding effect.
  • the present invention obviates the drawbacks of the prior art by providing a novel approach for utilization of exhaust steam and low grade vapours, typically in the rage of 0.05 to 0.25 bar absolute pressure, from turbines, pans, evaporators and similar devices.
  • the present invention brings an innovative concept to use the low grade vapors or steam from pans, evaporators and turbine typically in the rage of 0.05 to 0.25 bar absolute pressure instead of discarding it into atmosphere.
  • These vapors or steam also have enough heat to concentrate the cane or beet juice while boiling off the water.
  • This low pressure operation or low pressure boiling of juice reduces inversion, scale and colour formation with reduced sugar losses through inversion.
  • Another positive effect of present invention is that power generation through the turbine increase considerably because of the elimination of bleed steam. This further improves the turbine efficiency and save fuel for the same designed power output.
  • the principal object of the present invention is to provide a novel approach of utilization of low pressure vapours or steam of typically in the rage of 0.05 to 0.25 bar absolute pressure for concentration of cane or beet juice.
  • Another object of the present invention is to provide a concept for concentration of cane or beet juice using low pressure vapours or steam from the sources like pans, evaporators and steam turbines.
  • Yet another object of the invention is to provide an energy efficient way for concentration of cane or beet juice using low pressure steam or vapours of pans, evaporators and turbine in single or multiple effect evaporation.
  • the novelty of the invention lies in the concept for utilization of low pressure steam or vapours typically in the rage of 0.05 to 0.25 bar absolute pressure from pans, evaporators and turbine to concentrate cane or beet juice in single or multiple effect evaporation.
  • This novel idea results in to synergistic beneficial effect that has not been disclosed in the prior art.
  • this low pressure steam or vapours from pans, evaporators and exhaust turbines which are otherwise discarded as waste from the system is used for concentration of the cane or beet juice.
  • the present invention is directed to provide a novel idea of utilisation of low grade steam or vapours typically in the rage of 0.05 to 0.25 bar absolute pressure from pans, evaporators and turbines, for the concentration of cane or beet juice in single or multiple effects evaporation.
  • the novelty lies in utilisation of these vapors or steam for evaporation which otherwise discarded to atmosphere as waste.
  • a novel approach for the concentration of cane or beet juice using low pressure vapours or steam typically in the range of 0.05 to 0.25 bar absolute pressure from pans, evaporators and turbine exhaust or any combination is used in single or multi effect evaporators.
  • the juice normally at 25-33°C is fed in forward or reverse feed manner into the evaporator of single or multi effects as per process demand.
  • the low pressure vapours or steam of typically 0.05 to 0.25 bar absolute pressure is used as heat source. Using this heat cane or beet juice is concentrated.
  • the vapour or steam is fed to first effect, generated vapours with this heat passed to second effect, and in similar fashion second to third effect and so on.
  • the cane or beet juice is fed from first effect to second, second to third effect and so on i.e. forward feed manner or it can be in reverse feed manner i.e. from last to first effect as per process requirement.
  • the low pressure vapours or steam of pans, evaporators or exhaust turbines is supplied to the first effect get condensed while evaporating the juice due to exchange of the heat.
  • the low pressure vapours of pans or evaporators or steam turbines exhaust is individually or can be used in any combination.
  • the condensate is collected to recycle back to process.
  • the vapour outlet of second effect is connected with vapour inlet of third effect and so on.
  • the vapour outlet of last effect is connected to a vacuum source through a preheater in a more specific operation. Concentrated juice is withdrawal from the last effect in forward flow or first effect in reverse flow.
  • Present invention enables the use of low temperature steam or vapours of pans, evaporators or turbines having considerable heat instead of letting it into the atmosphere thereby utilising the enthalpy of vapours in the boiling of juice at low pressure.
  • This low pressure boiling reduces inversion, lower scale formation and colour formation to minimise sugar losses as aforesaid.

Abstract

The utilization of low grade heat for concentration of cane or beet juice through evaporation using low pressure vapours or steam in single or multi effects evaporation is described in the present invention. In the present invention, this low pressure steam or vapours from pans, evaporators and exhaust turbines which are otherwise discarded as waste from the system is used for concentration of the cane or beet juice. This low pressure operation or low pressure boiling of juice reduces inversion, scale and colour formation with reduced sugar losses through inversion. Another positive effect of present invention is that power generation through the turbine increase considerably because of the elimination of bleed steam. This further improves the turbine efficiency and save fuel for the same designed power output.

Description

UTILISATION OF LOW GRADE HEAT FOR JUICE CONCENTRATION
FIELD OF INVENTION:
A novel approach for utilization of low pressure vapors or steam typically in the range of 0.05 to 0.25 bar absolute pressure to concentrate cane or beet juice instead of discarding to the atmosphere. The sources of these low grade vapors or steam in sugar plant are turbines exhaust, pans and evaporators vapors, and similar devices in the present invention.
BACKGROUND TO THE INVENTION (PRIOR ART):
In past few years, the sugar industry is continuously striving to reduce the steam consumption and heat losses. Recovery and utilisation of the unused waste heat is an essential for conservation of energy in any process or sugar industry. Evaporation and concentration is the major consumer of energy which is about 70% of the total energy requirement. This is a huge potential if somehow we are able to reduce this requirement by using waste or low grade heat. Evaporation is an operation used to remove water from a solution, suspension, or emulsion by boiling off the water with the application of heat of steam. Evaporators are very common equipments in process industry for concentrating the solution or boiling off the water. The common thing in every evaporation system is the utilisation of high grade steam or vapors typically in the range of 1.00 to 2.00 bar absolute pressure. Addition to this huge quantity of low grade vapors discarded to environment as waste.
According to Patent No EP0780146, the steam-heated evaporator or thickener is especially suitable for sea water or sugar beet juice. Its plate heat exchangers accept pre- distributed fluid flow from above, which falls as a film on the inner surfaces of vertical channels within, hence being heated in cross- and counter-current flow.
Patent No. US 20070151840A1 entitled 'Method and device for treating water' is a multi-effect falling-film evaporator, purified water for special purposes. In each effect, a steam phase and water phase is produced from the feed water. The steam phase is used for heating in the subsequent effect, whereby it condenses to product water, and the water phase becomes the feed stream for the subsequent effect.
Patent No. US 699038A entitled 'Multiple Effect' relates "to improvements in multiple effects for the evaporation or concentration of liquids or solutions in which the vapor of each preceding effect is used for the further evaporation in each succeeding effect.
Indian Patent Application No. 2319/DEL/2012 and 2468/DEL/2013 suggests that a heat exchanger assembly and modular evaporator comprising of heat exchange plate packs modules and entrainment separator arranged horizontally and vertically in a novel configuration forming a unique multi effect evaporator. The modular heat exchanger assembly is arranged for expanding heating surface by joining each module or more modules in series or parallel combinations for expanding in the same effect or in series or parallel combinations for additional effects without use of vapour lines.
The arrangements described in the prior art, the concentration of juice suffer from the following disadvantages:
1. Utilisation of vapors or steam typically 1.00 to 2.00 bar absolute pressure.
2. Less electrical power generation due to bleed out of 1.00 to 2.00 bar absolute steam from turbine.
3. Higher energy losses.
4. Fast scaling of evaporation heating surface due to high temperature.
5. High colour formation due to same reason.
6. High inversion loss due to again high temperature operation.
The present invention obviates the drawbacks of the prior art by providing a novel approach for utilization of exhaust steam and low grade vapours, typically in the rage of 0.05 to 0.25 bar absolute pressure, from turbines, pans, evaporators and similar devices. The present invention brings an innovative concept to use the low grade vapors or steam from pans, evaporators and turbine typically in the rage of 0.05 to 0.25 bar absolute pressure instead of discarding it into atmosphere. These vapors or steam also have enough heat to concentrate the cane or beet juice while boiling off the water. This low pressure operation or low pressure boiling of juice reduces inversion, scale and colour formation with reduced sugar losses through inversion. Another positive effect of present invention is that power generation through the turbine increase considerably because of the elimination of bleed steam. This further improves the turbine efficiency and save fuel for the same designed power output.
OBJECTS OF THE INVENTION:
The principal object of the present invention is to provide a novel approach of utilization of low pressure vapours or steam of typically in the rage of 0.05 to 0.25 bar absolute pressure for concentration of cane or beet juice.
Another object of the present invention is to provide a concept for concentration of cane or beet juice using low pressure vapours or steam from the sources like pans, evaporators and steam turbines.
Yet another object of the invention is to provide an energy efficient way for concentration of cane or beet juice using low pressure steam or vapours of pans, evaporators and turbine in single or multiple effect evaporation.
SUMMARY OF THE INVENTION:
The novelty of the invention lies in the concept for utilization of low pressure steam or vapours typically in the rage of 0.05 to 0.25 bar absolute pressure from pans, evaporators and turbine to concentrate cane or beet juice in single or multiple effect evaporation. This novel idea results in to synergistic beneficial effect that has not been disclosed in the prior art. In the present invention, this low pressure steam or vapours from pans, evaporators and exhaust turbines which are otherwise discarded as waste from the system is used for concentration of the cane or beet juice. The utilization of this low pressure vapours or exhaust steam eliminates the utilization of higher pressure steam for concentration of cane or beet juice which increase the power generation along with other benefits like reduces scaling, steam and juice flash heat losses, colour formation in juice, consumption of steam and fuel % cane, inversion due to high temperature, with reduced sugar losses. It improves final product quality and quantity due to low temperature concentration.
DETAILED DESCRIPTION OF THE INVENTION:
The present invention is directed to provide a novel idea of utilisation of low grade steam or vapours typically in the rage of 0.05 to 0.25 bar absolute pressure from pans, evaporators and turbines, for the concentration of cane or beet juice in single or multiple effects evaporation. The novelty lies in utilisation of these vapors or steam for evaporation which otherwise discarded to atmosphere as waste.
This specific synergistic approach results into two principal benefits which are:
1. Stopping the substantial heat of the sugar factory process from being discarding to the atmosphere, and consequently better energy efficiency and economy.
2. Utilisation of being considered waste vapors or steam as replacement of the high grade vapors or steam for the concentration of juice, and better turbine efficiency.
According to Fig. 1 and Fig. 2, a novel approach for the concentration of cane or beet juice using low pressure vapours or steam typically in the range of 0.05 to 0.25 bar absolute pressure from pans, evaporators and turbine exhaust or any combination is used in single or multi effect evaporators. The juice normally at 25-33°C is fed in forward or reverse feed manner into the evaporator of single or multi effects as per process demand. The low pressure vapours or steam of typically 0.05 to 0.25 bar absolute pressure is used as heat source. Using this heat cane or beet juice is concentrated. The vapour or steam is fed to first effect, generated vapours with this heat passed to second effect, and in similar fashion second to third effect and so on. The cane or beet juice is fed from first effect to second, second to third effect and so on i.e. forward feed manner or it can be in reverse feed manner i.e. from last to first effect as per process requirement. The low pressure vapours or steam of pans, evaporators or exhaust turbines is supplied to the first effect get condensed while evaporating the juice due to exchange of the heat. The low pressure vapours of pans or evaporators or steam turbines exhaust is individually or can be used in any combination. The condensate is collected to recycle back to process. The vapour outlet of second effect is connected with vapour inlet of third effect and so on. The vapour outlet of last effect is connected to a vacuum source through a preheater in a more specific operation. Concentrated juice is withdrawal from the last effect in forward flow or first effect in reverse flow.
Present invention enables the use of low temperature steam or vapours of pans, evaporators or turbines having considerable heat instead of letting it into the atmosphere thereby utilising the enthalpy of vapours in the boiling of juice at low pressure. This low pressure boiling reduces inversion, lower scale formation and colour formation to minimise sugar losses as aforesaid.
Advantages:
• Elimination of utilisation of vapours or steam typically 1.00 to 2.00 bar absolute pressure.
• More electrical power generation due to elimination of bleed out of 1.00 to 2.00 bar absolute steam from turbine and consequently high power cycle efficiency.
• Minimum energy losses because of utilisation of waste heat.
• Reduced rate of scaling of evaporation heating surface due to low pressure evaporation.
• Less colour formation in the cane or beat juice
• Very low inversion loss due to low temperature operation.
• Reduced water requirement for cooling & condensing and accordingly pumping power.
• Other benefits are enhanced product recovery % cane and improving quality. Recovery of waste vapour lost in conventional process from pans, evaporators and exhaust turbines and use for further application till the lowest possible sink temperature which further provides many other additional advantages.
Besides the application of the novel approach of the invention in the sugar industry for low pressure evaporation of cane or beet juice using low pressure vapours or steam of pans, evaporators and turbine exhaust or similar devices, this approach can be used in any process industry where evaporation or condensation happens, like thermal or solar power plants, co-generation plant, food processing industries, industrial effluent treatment plant with contemplated modification and without departing from the spirit and scope of the present invention.

Claims

I CLAIM
1. A novel concept for utilisation of low grade vapours or steam typically in the range of 0.05 to 0.25 bar absolute pressure from steam turbines, pans and evaporators and similar devices comprising:
- concentration of cane or beet juice in the sugar industry.
- concentration of juice in single or multi effect evaporation.
- concentration using any combination of heat source.
- concentration through reverse or forward feed arrangement of evaporators. wherein, the said idea of concentration of cane or beet juice is by evaporation.
2. The concentration of cane or beet juice comprising as claimed in claim 1 wherein the use for further application till the lowest possible sink temperature.
PCT/IN2015/000377 2014-10-09 2015-10-07 Utilisation of low grade heat for juice concentration WO2016056021A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN2883/DEL/2014 2014-10-09
IN2883DE2014 2014-10-09

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WO2016056021A1 true WO2016056021A1 (en) 2016-04-14

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014016853A2 (en) * 2012-07-27 2014-01-30 Vivek Verma Modular heat exchanger assembly
WO2015025334A2 (en) * 2013-08-21 2015-02-26 Vivek Verma Spray modular evaporator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014016853A2 (en) * 2012-07-27 2014-01-30 Vivek Verma Modular heat exchanger assembly
WO2015025334A2 (en) * 2013-08-21 2015-02-26 Vivek Verma Spray modular evaporator

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
GINDER A ET AL.: "Energy Conservation in the Sugar Industry.", ENERGY EFFICIENCY IN PROCESS TECHNOLOGY, 1993, Netherlands, pages 1015 - 1024 *
LAVARACK BP ET AL.: "Improving the energy efficiency of sugar factories: Case study for Pioneer Mill.", INTERNATIONAL SUGAR JOURNAL, 2004, pages 337 - 342 *
OGDEN JOAN M ET AL.: "Steam economy and cogeneration in cane sugar factories.", INTERNATIONAL SUGAR JOURNAL, pages 131 - 143 *

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