CN103017396A - Method for utilizing mash waste heat during alcohol production process - Google Patents

Abstract

The invention discloses a method for utilizing mash waste heat during an alcohol production process. The method comprises the following steps: (1) pumping 80 DEG C liquid mash into a heat exchanger for heat exchanging; (2), pumping 80 DEG C liquid vinasse into a heat exchanger for heat exchanging; (3), leading 68 DEG C liquid mash and 68 DEG C liquid vinasse which are produced after heat exchanging out for the next process; and (4), mixing the recycled heat quantity, and leading the mixed heat quantity into a circulating cooling water system through an electric control system. According to the method, the 80 DEG C liquid mash and the 80 DEG C liquid vinasse produced during the alcohol production process are utilized; an HR waste heat recovery system which is domestic professional equipment is adopted; the part of heat quantity is recovered to produce 18 DEG C chilled water, so as to control the fermentation temperature to be 30 to 32 DEG C; not only the temperature controlling ensuring annual normal alcohol fermentation but also waste heat utilization are realized; the refrigeration cost is reduced; and the production benefit is improved stably.

Description

The method of mash UTILIZATION OF VESIDUAL HEAT IN in a kind of alcohol production process

Technical field

The invention belongs to alcoholic fermentation industrial technology field, more specifically relate to the method for mash UTILIZATION OF VESIDUAL HEAT IN in a kind of alcohol production process.

Background technology

In the cassava alcohol production process, wine lees liquor temperature through the mash behind the cooking and liquefaction and distillation discharge all is not less than 80 ℃, and according to technological requirement all needs be cooled to about 62 ℃ and enter subsequent processing, Alcohol Production factory all carries out the heat exchange cooling with cooling water at present, this part heat does not all have method effectively to utilize, but also cooling is gone in power consumption.Exist fermentation temperature need to control 30-32 ℃ in the production technology simultaneously; lower the temperature by tank external spiral sheet heat exchanger; usually adopt cooling water temperature; but affect normal production during summer high temperature with regard to occurring to cool off; Some Enterprises adopts the phreatic water cooling, owing to need to carry out the protection of groundwater resources, phreatic water has been forbidden exploitation; for guaranteeing the need of production refrigeration system, the refrigerator system operating cost expense that goes up merely electricity consumption or steam is higher and increased production cost.

Summary of the invention

The object of the invention is to overcome the deficiency that prior art exists, the method for mash UTILIZATION OF VESIDUAL HEAT IN in a kind of alcohol production process is provided.The present invention is 80 ℃ liquefied fermented glutinous rice and the wine lees liquor that utilizes the cassava alcohol production process to produce, and adopts the HR system of domestic professional equipment waste heat recovery, the heat of this part is reclaimed make 18 ℃ of chilled waters, satisfies fermentation temperature and is controlled at 30-32 ℃.Realization can guarantee that the temperature control of annual normal alcoholic fermentation has realized again UTILIZATION OF VESIDUAL HEAT IN saved Energy Intensity Reduction refrigeration cost, the stable productivity effect that improves.

For achieving the above object, the present invention has taked following technical scheme:

The method of mash UTILIZATION OF VESIDUAL HEAT IN comprises the steps: in a kind of alcohol production process

(1) 80 ℃ of liquefied fermented glutinous rices is passed into heat exchanger and carry out heat exchange;

(2) 80 ℃ of poor liquid are passed into heat exchanger and carry out heat exchange;

(3) step (1) heat exchange is finished 68 ℃ the liquefied fermented glutinous rice derivation that produces and entered next procedure;

(4) step (2) heat exchange is finished 68 ℃ the poor liquid derivation that produces and entered next procedure;

(5) heat that step (1) and step (2) is reclaimed mixes, and imports in the recirculating cooling water system by electric-control system.

Below technique scheme is introduced:

The present invention utilizes liquefied fermented glutinous rice and the wine lees liquor of 80 ℃ of temperature in the Alcohol Production to carry out power conversion by the heat exchange absorption liquid of heat exchanger and HR system respectively, control liquefied fermented glutinous rice and wine lees liquor discharge temperature are 68 ℃ and go rear road production process, heat transfer process can adopt the spiral-plate heat exchanger indirect heat exchange, guarantees the aseptic requirement of mash.

The heat exchange absorption liquid is made 18 ℃ of water at low temperature by the work done conversion of HR system and is used for Alcohol Production fermentation cooling.

By the HR system, realize that heat energy standard processed is cold, system is continuously operation.The method of operation: use the HR residual neat recovering system, can be in the step-less adjustment of 20%-100% for cold.

Compared with the prior art the present invention has the following advantages:

(1) liquefied fermented glutinous rice and the vinasse heat of alcohol production process have been realized recovery.

(2) adopt the HR bootstrap system to realize making cold water to low heat value mash heat and be used for alcoholic fermentation production.

(3) the utilizing waste heat for refrigeration technique of the present invention's employing and employing electricity or steam-refrigerated comparing, a year cost expense can reduce 1,000,000 yuan.

The specific embodiment

The present invention will be further described below in conjunction with specific embodiment.

Embodiment 1

The demand condition that certain cassava alcohol continuous process system is produced is as follows:

Liquefied fermented glutinous rice: 85 ℃ of temperature, flow 130m ³/ h, pH6, dry matter content 10% need be cooled to 65 ℃.

Grain liquid: 85 ℃ of temperature, flow 130m ³/ h, pH5, dry matter content 10% need be cooled to 65 ℃.Flow adds up to 260t/h.Fermentation temperature need to be controlled 30-32 ℃ in the production, is 34,90K,WH(,300 ten thousand kilocalories by surveying fermentation temperature control summer with cold).

Calculate for cold: liquefied fermented glutinous rice and the vinasse temperature difference are 15 ℃ of calculating, and the total flow is 260t/h, and specific heat is 1.1, and calculating to be 40,70K,WH(,350 ten thousand kilocalories for cold).Can satisfy Production requirement fully.

Liquefied fermented glutinous rice and vinasse respectively with system's heat exchange absorption liquid heat exchange, heat-exchange system adopts the carbon steel spiral-plate heat exchanger, liquefied fermented glutinous rice and vinasse all adopt total heat exchange area 540m ²I.e. 3 180m ²Spiral-plate heat exchanger, about 68 ℃ of feed liquids are gone rear road production process after two system's independence heat exchange.System's heat exchange absorption liquid returns to the HR residual neat recovering system, circular flow by HR system output and capable of regulating flow quantity after by heat exchanger.By the effect of HR residual neat recovering system, flow 307t/h can be provided, the low-temperature cold water that outlet temperature is 18 ℃ goes to satisfy the cooling of Alcohol Production fermentation system with cold.Can be in the step-less adjustment of 20%-100% for cold, the about 31kW of system's rated power.

Set up recirculating cooling water system for the cooling of HR residual neat recovering system, by recirculating cooling water system the HR system is lowered the temperature.Water inlet is by 32 ℃, and leaving water temperature is 40 ℃, and needing the circulating cooling water yield is 880m ³/ h, the about 135KW of operate power.

The Anticorrosion of systematic economy: adopt carbon steel with liquefied fermented glutinous rice and poor liquid contact portion pipeline, valve etc., adopt 304 stainless steels with liquefied fermented glutinous rice and poor liquid contact portion equipment.

Operating cost: electricity price: 0.6 yuan/Kw.h and water rate: 2.00 yuan/tons of meters, for cold: Q=3490KW(300 ten thousand kilocalories); Residual neat recovering system electricity consumption: 31KW; The year operation adds up to: ten thousand yuan/year of 31 * 3 * 24 * 30 * 0.6=4.

Claims (1)

1. the method for mash UTILIZATION OF VESIDUAL HEAT IN in the alcohol production process is characterized in that, comprises the steps:

(1) 80 ℃ of liquefied fermented glutinous rices is passed into heat exchanger and carry out heat exchange;

(2) 80 ℃ of poor liquid are passed into heat exchanger and carry out heat exchange;

(3) step (1) heat exchange is finished 68 ℃ the liquefied fermented glutinous rice derivation that produces and entered next procedure;

(4) step (2) heat exchange is finished 68 ℃ the poor liquid derivation that produces and entered next procedure;

(5) heat that step (1) and step (2) is reclaimed mixes, and imports in the recirculating cooling water system by electric-control system.