CN203115972U - Device for efficiently recovering flue gas waste heat for heating boiler replenishing water - Google Patents

Abstract

The utility model discloses a device for efficiently recovering flue gas waste heat for heating boiler replenishing water. The device comprises a high-temperature flue gas box and a water tank. The high-temperature flue gas box and the water tank are of an integral metal box. A baffle is arranged in the middle to partition the high-temperature flue gas box and the water tank. The high-temperature flue gas box and the water tank are connected with each other through heat pipes which penetrate through the baffle. Full-weld sealing treatment is conducted on the penetration position of the baffle. The heat exchange area of the heat pipes is expanded by adopting a technology of welding fins at high frequency. Each heat pipe works independently. Even though a single heat pipe fails, the overall operation is not influenced. Under the effect of the existing configured induced draft fan of a boiler, the high-temperature flue gas passes through the high-temperature flue gas box at high speed and heat is transferred through the heat pipes to heat normal-temperature water in the water tank. The device disclosed by the utility model has the advantages that the resources such as the waste heat of the high-temperature flue gas which is emptied by the boiler are fully utilized to heat the boiler replenishing water to meet the demand of rapidly increasing the pressure of the boiler during working, the energy is saved, the environmental pollution is reduced and the operating cost of the boiler is greatly reduced.

Description

The device of a kind of high efficiente callback fume afterheat heating boiler moisturizing

Technical field

Utility model relates to the device of a kind of high efficiente callback fume afterheat heating boiler moisturizing.

Background technology

Industrial fuel oil, combustion gas, when coal-burning boiler manufactures and designs, in order to prevent heated surface at the end of boiler corrosion and stifled ash, the standard state exhaust gas temperature generally is not less than 180 ℃, reaches as high as more than 300 ℃, and the high-temperature flue gas discharging not only causes a large amount of thermal waste, and the while is contaminated environment also.Boiler thermal output generally about 70%, is wasted through the flue emptying and other 30% left and right sides heat energy are most of.The flue gas waste heat recovery apparatus that the utility model is announced is simple and reliable; Do not change boiler body any part, construction time weak point, boiler is not had risk, and can reduce the boiler operatiopn cost greatly.

Summary of the invention

The purpose of this utility model is for overcoming above-mentioned deficiency, the device of a kind of high efficiente callback fume afterheat heating boiler moisturizing being provided.

The utility model adopts following technical proposals:

The device of a kind of high efficiente callback fume afterheat heating boiler moisturizing comprises the high-temperature flue gas case, water tank.Described high-temperature flue gas case and water tank are a bulk metal case, and the centre separates with metal partion (metp).Link to each other by the heat pipe through dividing plate, the full weld encapsulation process is done in perforation place of described dividing plate, and the two is isolated into two separate space, described heat pipe adopts the process spread heat exchange area of high-frequency welding fin, every works independently, even single inefficacy can not influence overall operation yet.High-temperature flue gas passes through the high-temperature flue gas collection box at a high speed under the air-introduced machine effect of the former configuration of boiler, and finishes the heat conduction by described heat pipe, in order to the normal-temperature water of heating water tank.

Described heat pipe operation principle: from thermodynamic (al) angle, the good capacity of heat transmission why heat pipe has, the heat absorption, the heat release that are derived from object are relative, and be every when having temperature difference to exist, and the phenomenon of heat transmission from high temperature to the low temperature place just must occur.From three kinds of modes (radiation, convection current, conduction) of heat transmission, wherein the heat conduction is the fastest.Heat pipe utilizes sweat cooling exactly, makes that heat pipe two ends temperature difference is very big, and heat is conducted fast.General heat pipe is made up of shell, imbibition core and end cap.Inside heat pipe is to be pumped into negative pressure state, charges into suitable heat-conducting medium liquid, and this boiling point of liquid is low, easily volatilization.Tube wall has the imbibition core, and it is made of the capillary porous material.Heat pipe one end is evaporation ends, an other end is condensation end, when heat pipe one end is heated, liquid in the capillary evaporates rapidly, and steam flows to an other end under small pressure differential, and discharges heat, regelation becomes liquid, liquid flows back to evaporator section along porous material by the effect of capillary force again, and so circulation is more than, and heat reaches an other end by heat pipe one end.This circulation is carried out fast, and heat can be come by conduction continuously.As shown in Figure 1.

The utility model reduces discharging and is main purpose with energy savings, takes full advantage of the resources such as high-temperature flue gas waste heat of boiler emptying to the moisturizing heating of boiler, to reach the needs that the duration of work boiler boosts fast, makes the energy saved, and is conducive to protect environment.

The beneficial effects of the utility model are:

(1) heat pipe is to absorb when the Working fluid phase changing and discharge the latent heat of vaporization, and working medium flows to conduct heat, the thermal conductivity height, and its capacity of heat transmission is far longer than known any metal;

(2) the process spread heat exchange area of employing heat pipe side high-frequency welding fin, its heat transfer coefficient is compared with traditional tubular heat exchanger and can be improved more than 5 times;

(3) the isothermal performance is good.Heat pipe inner chamber is in the steam of saturation state by the pressure that evaporation ends flows to condensation end very little (having only about 1 ℃).The wall surface temperature of heat pipe work is higher, away from acid dew point and cold end corrosion zone, fundamentally avoids the appearance of dewing corrosion and clogging phenomenon;

(4) security reliability height.Even single heat pipe failure cold fluid and hot fluid also will not take place mixes, influence the safe operation of boiler.The heat exchange occasion that is used for fluids such as inflammable, explosive, many dirt of burn into has very high security reliability;

(5) save floor space.The heat exchange element of being made by finned tube, when being used in combination with heat-exchanger rig, its compact conformation, installation weight be light, save space, applicable to limited installing space;

(6) operating cost is low.Because heat pipe work does not need power, movement-less part does not produce noise, and cold fluid and hot fluid all flows outside pipe, and separates fully by dividing plate, and single heat pipe works alone, and is independent of each other;

(7) applied widely.Device has adopted composite design, can realize the heating boiler moisturizing according to different operating modes.

Description of drawings

Fig. 1 is by being adopted heat exchange components and parts heat pipe schematic diagram in the utility model;

Wherein: 1. heat pipe, 2. fin, 3. heat release section, 4. dividing plate, 5. endotherm section, 6. liquid (working medium), 7. steam (working medium).

Fig. 2 is heat-pipe air preheater schematic diagram of the present utility model;

Wherein: 1. high-temperature flue gas case, flue gas trend, 2. dividing plate, 3. heat pipe 4. is heated the back hot water outlet, 5. water tank,

Water loop direction, 6. normal-temperature water entrance, 7. boiler dust remover, 8. boiler induced-draft fan, 9. boiler, 10. chimney.

The specific embodiment

With the high-temperature flue gas heating boiler moisturizing example of recovery boiler emptying the utility model is done further detailed description below in conjunction with accompanying drawing.

The device of a kind of high efficiente callback fume afterheat heating boiler moisturizing:

1, the contained heat energy in the high-temperature flue gas of high-temperature flue gas case 1 of flowing through is delivered to water tank 5 by the heat pipe 3 through dividing plate 2;

2, the contained heat energy of high-temperature flue gas passes through via high-temperature flue gas endothermic box 1, washes away heat pipe 3 heat energy and transmits and the heating boiler moisturizing to water tank 5;

3, the normal temperature boiler replenishing water enters from 6, is connected with the drum water inlet via heat pipe 3 heating again;

4, the flue gas of process cooling under the effect of air-introduced machine 8, enters chimney discharged to atmosphere through dust arrester 7.

The heater of described high-temperature flue gas heating boiler moisturizing, top is divided into water tank, and the bottom is divided into the flue gas case.

Described water tank and flue gas case have dividing plate to separate.

Described heat pipe by dividing plate through between water tank and the flue gas case, perforation place full weld encapsulation process.

Described heat pipe calculates via the thermal technology and carries out specification, quantity, arranged ordered by design.

Described flue gas discharged to atmosphere calculates via the thermal technology and guarantees that its exhaust temperature is more than acid dew point.

Embodiment 1

The 10t/h residual heat from boiler fume reclaims the heating boiler moisturizing

Energy saving calculation

1, steam boiler (10T ∕ h)

(1) steam boiler smoke evacuation parameter:

10T ∕ h steam boiler exhaust gas temperature is about 230 ℃, and boiler load is according to 80% design.

A. exhaust gas temperature: 230 ℃

B. actual exhaust smoke level: 15000Nm3/h

C. transform the back exhaust gas temperature :≤130 ℃

2, calculate:

(1) per hour reclaim heat:

Flue-gas temperature is down to 130 ℃ from 230 ℃, per hour recyclable heat: 500,000 kilocalories.

The recovery heat Calculation is as follows:

Q=CP * L * p * (T advance-T go out)

=1.088kj/（kg·℃）×15000×1.295kg/?m3×（230℃-130℃）

=2113440kj/h

=50.5 ten thousand kcal/h

Wherein: Q is for per hour reclaiming heat

CP is flue gas specific heat at constant pressure 1.088 kj/(kg ℃)

L is flue gas flow 15000Nm3/h

P is smoke density 1.295 kg/ Nm3

T advances T and goes out to be respectively turnover heat exchanger heat absorbing end flue-gas temperature (T advances 230 ℃ of boiler export temperature, and T goes out by the theoretical design of heat exchanger can reach 130 ℃ of outlet temperatures).

3, boiler replenishing water improves temperature

Heat loss 10% is calculated, and heat exchanger inlet water temperature (environment temperature), can improve leaving water temperature about 50 ℃ after the heating of super heat-conductive pipe heat exchanger by average 20 ℃ of calculating, and the boiler replenishing water temperature is increased to about 70 ℃.

Be calculated as follows:

ΔT=Q×90%÷(Z×Y)

=50.5 ten thousand kcal * 90% ÷ (10000kg/h * 1kcal)

≈50℃

Wherein: Δ T is that moisturizing improves temperature;

Q is for per hour reclaiming heat

Z is actual evaporation

Y rises 1 ℃ of institute's calorific requirement for the 1kg water temperature

4, economic benefit:

(1) coal of conversion saving:

The raw coal calorific capacity is calculated according to 5000kcal/kg

Save coal amount=50.5 ten thousand kcal/h ÷ 5000kcal/kg ≈ 90kg/h

(2) annual earnings:

Annual operation is by 11 months, and every month by 30 days, and every day is by operation 20 hours, and coal price per ton is according to 680 yuan of calculating:

40.39 ten thousand yuan/year of 680 yuan/T * 0.09T/h * 20h/ days * 30 days/month * November/year ≈

Claims (3)

1. the device of high efficiente callback fume afterheat heating boiler moisturizing comprises high-temperature flue gas case, water tank, it is characterized in that:

Described high-temperature flue gas case and water tank are a bulk metal case, and the centre separates with metal partion (metp), link to each other by the heat pipe through dividing plate.

2. the device of high efficiente callback fume afterheat heating boiler according to claim 1 moisturizing, it is characterized in that, through high-temperature flue gas case and water tank, described heat pipe adopts the process spread heat exchange area of high-frequency welding fin to described heat pipe by circular hole, and every works independently.

3. the device of high efficiente callback fume afterheat heating boiler according to claim 1 moisturizing is characterized in that, the dividing plate circular hole through part between described high-temperature flue gas case and water tank is handled through full weld, and the two is isolated into two separate space.

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