CN202263404U

CN202263404U - High-efficiency energy-saving close type circulation spray drying system

Info

Publication number: CN202263404U
Application number: CN2011203741430U
Authority: CN
Inventors: 张冬毅; 钱东明; 王洪祥
Original assignee: WUXI QUNZHENG DRYING EQUIPMENT CO Ltd
Current assignee: WUXI QUNZHENG DRYING EQUIPMENT CO Ltd
Priority date: 2011-09-29
Filing date: 2011-09-29
Publication date: 2012-06-06
Anticipated expiration: 2021-09-29

Abstract

The utility model discloses a high-efficiency energy-saving close type circulation spray drying system. A spray drying tower, a dedusting separator and a tail gas condenser are sequentially connected in series. A waste heat exchanger is additionally arranged between the dedusting separator and the tail gas condenser, condenser tail gas is contained in a cold medium passage of the waste heat exchanger, and a cold medium outlet is communicated to a heater. Dedusting separator tail gas is contained in a hot medium passage, and a hot medium outlet is communicated to a hot medium inlet of the condenser. The dedusting separator tail gas serves as hot media to preheat tail gas discharged by the condenser, thereby effectively lowering the temperature of the tail gas entering the condenser, fully utilizing heat energy of the tail gas, achieving energy saving in gas heating and solvent condensation simultaneously and having obvious energy-saving effects. Compared with actual operation, the same unit can save energy by more than 30%, thereby greatly reducing operation cost of a dryer and having remarkable economic benefits and social benefits.

Description

Energy-efficient closed cycle spray drying system

Technical field

The utility model relates to drying device field, especially the closed cycle spray drying system.

Background technology

Spray drying system is commonly used to the liquid solution material is atomized, carries out simultaneously heated-air drying, thereby forms the solute powder, is divided into open type spray drying system and enclosed spray drying system usually.The tail gas of open type spray drying system is directly to airborne release; Because of exhaust temperature higher; Usually at 80～140 ℃, some exhaust temperature even more than 200 ℃, so also discharged a large amount of heat energy in the process of exhaust emissions; The heat energy that gives off accounts for 40～70% of dry total energy consumption, and energy consumption cost is very high.The enclosed spray drying system adopts inert gas (the being generally nitrogen) circulatory system of sealing; The tail gas of discharging in the dry run is carried out circulating once more after the solvent recovery; Thereby avoid the pollution of dust to atmosphere; Also avoid taking place security incidents such as burning or blast, also widened the solvent scope of application of material simultaneously.

The disclosed structure of existing enclosed spray drying system such as patent " CN200610038012.9---closed circulating dry system "; Its basic functional principle is as shown in Figure 1; Can produce a large amount of high-temperature gases in system's tail gas; Must this part high-temperature tail gas be carried out condensation once more, be used for solvent recovery, this process need mass energy consumption.Then the tail gas after this partial condensation is circulated to be back in the heater again and heat once more.Thereby, not only need in heating process, consume energy in the present closed circulating dry system, in condensation process, also need power consumption simultaneously.The operation principle and the process equipment of therefore existing spray drying system, the high energy consumption problem in its dry run is quite outstanding.

The utility model content

The applicant need be to the condensation of tail gas elder generation to reclaim solvent to above-mentioned existing enclosed spray drying system; And then reheat use; Cause the high shortcoming of energy consumption; A kind of energy-efficient closed cycle spray drying system is provided, thereby can reduces the work energy consumption greatly, obtain effect energy-saving and cost-reducing, environmental protection.

The technical scheme that the utility model adopted is following:

A kind of energy-efficient closed cycle spray drying system; Spray drying tower, dust separator are connected with the tail gas condenser order; Increase is provided with afterheat heat exchanger between dust separator and condenser, is condenser tail gas in the coolant path of afterheat heat exchanger, and refrigerant exit is communicated to heater; And be dust separator tail gas in the heating agent path, the heating agent outlet is communicated to the heating agent inlet of condenser.

It is further characterized in that: said afterheat heat exchanger is the pipe heat exchanger structure, and dust separator tail gas is from bottom to top through tube side, and condenser tail gas is provided with the solvent recovery path from top to bottom through shell side in the afterheat heat exchanger bottom.

The beneficial effect of the utility model is following:

The utility model increases between the separator of the closed cycle spray drying system of routine and condenser afterheat heat exchanger is set; The tail gas that separator tail gas is exported condenser as heating agent carries out preheating; Also effectively reduce simultaneously the exhaust temperature that gets into condenser; Make full use of the heat energy of tail gas itself, killed two birds with one stone, realized the energy-conservation of gas heating, solvent condenses two aspects simultaneously; Energy-saving effect is obvious.Through the actual motion contrast, identical unit can save energy more than 30%.With 5000m ³The unit of/h air quantity is an example, and the 100KW at least that per hour can economize on electricity greatly reduces drying machine operating cost, has remarkable economic efficiency and social benefit.

Description of drawings

Fig. 1 is the fundamental diagram of existing enclosed spray drying system.

Fig. 2 is the fundamental diagram of the utility model.

Fig. 3 is the sketch map of the drying system of the utility model.

Fig. 4 is the structure chart of the afterheat heat exchanger of the utility model.

The specific embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the utility model is described.

Like Fig. 2, shown in Figure 3; The spray drying tower 2 of the described energy-efficient closed cycle spray drying system of the utility model carries out the solution supply from the feed pipe 1 at tower body top; Feed the inert gas 9 through heater 7 heating simultaneously from the tower body top, the temperature of inert gas 9 is 160～200 ℃, forms droplet after the atomizing of solution through atomizer; Under the desiccation of hot-air, the solvent evaporation in the droplet forms solia particle; Drying tower tail gas 11 gets into cyclone separator 3 and carries out the solid and gas separation through air draft pipe; Cyclone separator tail gas 12 gets into follow-up sack cleaner 4 subsequently, further residual fraction solid particle is filtered and collects.

The utility model is provided with afterheat heat exchanger 5 between the solid and gas separator of the closed cycle spray drying system of routine and condenser 6, afterheat heat exchanger 5 directly utilizes sack cleaner tail gas 13 as heating agent, and condensation tail gas 14 is carried out heat exchange.As shown in Figure 4; The structure of afterheat heat exchanger 5 is similar with conventional pipe heat exchanger; The cylindrical tube barrel is provided with heat-insulation layer 5-3, and cylindrical shell is divided into upper shell 5-1, middle cylinder body 5-4 and lower shell 5-6 by last lower perforated plate 5-9, and tube bank 5-2 is distributed in the middle cylinder body 5-4 cavity; Form heat exchange path one (being referred to as tube side) with upper shell 5-1 and lower shell 5-6, and the outside middle cylinder body 5-4 of tube bank 5-2 forms heat exchanger channels two (being referred to as shell side).During real work, the gas temperature of sack cleaner tail gas 13 is about 80～90 ℃, gets into lower shell 5-6 from heating agent import 5-7, and passes through tube side from bottom to top along tube bank 5-2; Simultaneously; The condensation tail gas 14 (0～10 ℃) of condenser 6 outputs gets into from the preheating gas import 5-10 that treats on the top of afterheat heat exchanger 5 from the rear portion; Through shell side, carry out heat exchange at the tube wall of restraining 5-2 from top to bottom, the preheating tail gas 16 that temperature is increased to about 50 ℃ is exported from preheating gas outlet 5-5; And tube bank 5-2 gas inside temperature is reduced to about 50 ℃, is collected to upper shell 5-1 and gets into condenser 6 through tail gas 15 after the heating agent outlet 5-8 output heat exchange.

The basic structure of condenser 6 is identical with afterheat heat exchanger 5; Tail gas 15 gets into the upper shell of condensers 6 and flows downward through tube side after the heat exchange; Refrigerant (adopting chilled water usually) gets into from refrigerant inlet 6-2; And, pass through shell side from bottom to top from refrigerant exit 6-3 outflow, tail gas (about 50 ℃) after the heat exchange in restraining is cooled to condensation tail gas 14 (0～10 ℃) and inputs to afterheat heat exchanger 5 carry out preheating.Afterheat heat exchanger 5 is provided with solvent outlet with the bottom of condenser 6, and the solvent of separating out after the tail gas condensation is from solvent outlet outflow and remittance solvent collection device 17.

Preheating tail gas 16 (about 50 ℃) mixes with nitrogen source of the gas 10 (room temperature) mutually, heats through heater 7, is warming up to 160～200 ℃ mist 9, and input spray drying tower 2 carries out drying operation.A whole set of closed cycle spray drying system is controlled by control module 8.

Use the closed cycle spray-drying unit of the utility model UTILIZATION OF VESIDUAL HEAT IN technology, data measured in actual motion are following:

Service condition is: drying system is with 5000m ³/ h air quantity, solvent are that isopropyl alcohol is an example, advance 150 ℃ of tower gas temperatures, 85 ℃ of exhaust gas temperature, 50 ℃ of UTILIZATION OF VESIDUAL HEAT IN heat exchanger outlet temperatures, 0 ℃ of condensing tower outlet temperature, isopropyl alcohol evaporation capacity 200kg/h; Q ₁Q ₂Q ₃Q ₄Be measured value.Then:

(1) heating system is saved energy consumption: Δ Q _Heat=Q ₁-Q ₃=48522.2Kal/h

(2) condenser system is saved energy consumption: Δ Q _Cold=Q ₂-Q ₄=38258.06 Kal/h

(3) energy-saving effect:

η=(Δ Q _Heat+ Δ Q _Cold)/(Q ₁+ Q ₂) x100%

=?86780.26/?272144.5?x100%

=?31.88%

Wherein: Q ₁Be the heating energy consumption of prior art, Q ₃Be the heating energy consumption of the utility model, Δ Q _HeatBe both differences, promptly utilize the heating energy consumption of saving behind the waste heat;

Q ₂Be the condensation energy consumption of prior art, Q ₄Be the condensation energy consumption of the utility model, Δ Q _ColdBe both differences, promptly utilize the condensation energy consumption of saving behind the waste heat;

η is an energy-saving efficiency.

Through above data contrast, utilize the heat recovery technology of the utility model, can be energy-conservation more than 30%.

More than describing is the explanation to the utility model, is not the qualification to utility model, and the utility model institute restricted portion is referring to claim, and under the situation of the utility model spirit, the utility model can be done any type of modification.

Claims

1. energy-efficient closed cycle spray drying system; Spray drying tower (2), dust separator are connected with tail gas condenser (6) order; It is characterized in that: increase is provided with afterheat heat exchanger (5) between dust separator and condenser (6), is condenser tail gas in the coolant path of afterheat heat exchanger (5), and refrigerant exit is communicated to heater (7); And be dust separator tail gas in the heating agent path, the heating agent outlet is communicated to the heating agent inlet of condenser (6).

2. according to the described energy-efficient closed cycle spray drying system of claim 1; It is characterized in that: said afterheat heat exchanger (5) is the pipe heat exchanger structure; Dust separator tail gas passes through tube side from bottom to top; Condenser tail gas is provided with the solvent recovery path from top to bottom through shell side in afterheat heat exchanger (5) bottom.