CN106554424B - Dry tail gas recycle and combine with heat pump to realize energy-efficient method - Google Patents

Abstract

Dry tail gas recycle and combine with heat pump the present invention relates to one kind to realize energy-efficient method, belongs to cornstarch wet production field.Live steam enters pipe bundle drier, byproduct is dried, the tail gas generated after drying enters scrubbing tower, tail gas is sent into evaporation heating room one through blower one by tail gas, the secondary steam of generation carries out pressurization by heat pump and enters remaining evaporation heating room two, the on-condensible gas of generation enters condenser and carries out condensate drainage, condenser is cooled down by cold medium recirculated water, cold medium squeezes into the preheater of Starch Drying System after condenser exchanges heat through circulating pump simultaneously, cold medium is entering condenser after air-cooled, air after preheating mixes after heater with wet starch, realize starch drying process.Advantage is to reach energy-saving and emission-reduction by making full use of to non-renewable energy, reduces production consumption, and then reduce production cost；Steam is saved, sulfur dioxide (SO2) emissions 40% are reduced.

Description

Dry tail gas recycle and combine with heat pump to realize energy-efficient method

Technical field

The invention belongs to cornstarch wet production field, the high temperature drying generated to byproduct production process is referred in particular to The reuse method of tail gas.

Background technique

After using pipe bundle drier to be dried during cornstarch wet production byproduct at present, high-temperature tail gas is direct Discharge, this partial tail gas calorific value is very high, and direct emission causes very big energy waste, corn deep processing traditional drying, evaporator man Using the dry tail gas direct emission of byproduct in skill, and corn pulp evaporation directly carries out heating evaporation with initial steam, and starch is dry Hot wind is also to be directly heated using initial steam, the disadvantages are as follows: consuming excessive non-renewable energy, the wasting of resources is processed into This height；Dry tail gas sulphur dioxide content is high, pollutes environment.

Summary of the invention

The present invention provides one kind and the energy-efficient method of realization is recycled and combined with heat pump to dry tail gas, to solve The excessive non-renewable energy of consumption caused by dry tail gas direct emission, the wasting of resources, processing cost is high, and content of sulfur dioxide is high, makes The problem of at pollution environment.

The technical solution adopted by the present invention is that: include the following steps:

(1) live steam enters pipe bundle drier, and byproduct is dried, and the tail gas generated after dry enters washing Impurity in tail gas is washed away, while removing sulfur dioxide by tower, and detergent uses weak lye,

(2) tail gas is sent into evaporation heating room one through blower one by the tail gas after washing, and is evaporated concentration to dilute corn pulp, Tail gas emptying, mixture into separation chamber one,

(3) secondary steam generated pressurizes by heat pump, improves 20 ~ 25 degree, the secondary steam of high heating value enters it Room two is heated in remaining evaporation, and mixture enters separation chamber two,

(4) on-condensible gas generated enters condenser progress condensate drainage, and condenser is carried out cold by cold medium recirculated water But, while cold medium squeezes into the preheater of Starch Drying System after condenser exchanges heat through circulating pump, it is air-cooled after cold Jie Matter is entering condenser,

(5) air after preheating mixes after heater with wet starch, is siphoned away by blower, expansion drying, realizes starch Drying process.

It is an advantage of the invention that reaching energy-saving and emission-reduction by making full use of to non-renewable energy, production consumption is reduced, into And reduce production cost；Present invention saves steam, reduce 0.2 ton/ton starch of steam mono-consumption, reduce sulfur dioxide (SO2) emissions 40%.

Detailed description of the invention

Fig. 1 is flow chart of the invention.

Specific embodiment

Include the following steps:

(1) live steam enters pipe bundle drier 1, and byproduct is dried, and the tail gas generated after dry enters washing Impurity in tail gas is washed away, while removing sulfur dioxide by tower 2, and detergent uses weak lye,

(2) tail gas is sent into evaporation heating room 1 through blower 1 by the tail gas after washing, and is evaporated to dilute corn pulp dense Contracting, tail gas emptying, mixture into separation chamber 1,

(3) secondary steam generated carries out pressurization temperature raising by heat pump 6, improves 20 ~ 25 degree, the secondary steam of high heating value into Entering remaining evaporation heating room 27, mixture enters separation chamber 28,

(4) on-condensible gas generated enters the progress condensate drainage of condenser 9, and condenser 9 is carried out by cold medium recirculated water It is cooling, while cold medium squeezes into the preheater 11 of Starch Drying System after condenser exchanges heat through circulating pump 10, it is air-cooled Cold medium is entering condenser 9 afterwards,

(5) cold air after preheating mixes after heater 12 with wet starch, is siphoned away by blower 13, expansion drying, real Existing starch drying process.

The byproduct of cornstarch wet production is dry using pipe bundle drier, heating method be passed through primary steam into Row tube bank temperature raising, temperature reach 150 ~ 180 degrees Celsius, and dewatered byproduct includes fiber, plumule, albumen powder, and moisture exists Between 55-60%, this partial material enters pipe bundle drier, and 80-100 degrees Celsius of tail gas of generation removes object by washing Dust in material, sulfur dioxide gas etc. add corn thin pulp into multi-effect evaporator one of evaporation heating room The flash steam of heat, generation is carrying out heat pump pressurization, then is passed through remaining evaporation oven heats evaporation, the on-condensible gas finally generated It is passed through preheater after the cold medium fluid heating of condenser into condenser, carries out cold air heating, medium fluid passes through wind Condenser is entered back into after cold to condense on-condensible gas, and then forms circulation；Cold air after preheating after heater with wet shallow lake Powder mixing, is siphoned away, expansion drying by blower, realizes starch drying process.

Claims (1)

1. a kind of recycle and combine with heat pump to dry tail gas realizing energy-efficient method, it is characterised in that including following Step:

(1) live steam enters pipe bundle drier, and byproduct is dried, and the tail gas generated after dry enters scrubbing tower, will Impurity in tail gas washes away, while removing sulfur dioxide, and detergent uses weak lye,

(2) tail gas is sent into evaporation heating room one through blower one by the tail gas after washing, and is evaporated concentration, tail gas to dilute corn pulp Emptying, mixture into separation chamber one,

(3) secondary steam generated pressurizes by heat pump, improves 20 ~ 25 degree, the secondary steam of high heating value is steamed into remaining Hair heating room two, mixture enter separation chamber two,

(4) on-condensible gas generated enters condenser progress condensate drainage, and condenser is cooled down by cold medium recirculated water, together When cold medium squeeze into the preheater of Starch Drying System through circulating pump after condenser exchanges heat, it is air-cooled after cold medium again Into condenser,

(5) air after preheating mixes after heater with wet starch, is siphoned away by blower, expansion drying, realizes that starch is dry Process.