CN104174274B - For the spray packed tower of flue gas waste heat recovery - Google Patents

For the spray packed tower of flue gas waste heat recovery Download PDF

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Publication number
CN104174274B
CN104174274B CN201410397395.3A CN201410397395A CN104174274B CN 104174274 B CN104174274 B CN 104174274B CN 201410397395 A CN201410397395 A CN 201410397395A CN 104174274 B CN104174274 B CN 104174274B
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China
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packed tower
spray
flue gas
spray packed
described
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CN201410397395.3A
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CN104174274A (en
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谢正和
孟继安
朱迎春
王正兴
贾向东
隋晓峰
赵岩
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北京源深节能技术有限责任公司
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Abstract

The invention provides a kind of spray packed tower for flue gas waste heat recovery, comprise: spray packed tower main body (1), spray assemblies (2), filler (3), dehydrater (4), blower fan (7), flue and oxidizer distributor (9), spray packed tower central dividing plate (112) is provided with from bottom to up in described spray packed tower main body (1), packing support plate (113) and dehydrater gripper shoe (114), the inner chamber of spray packed tower main body (1) is separated for heat transfer space is drenched in alkali storage space, bottom and upper smoke gas blowout by described spray packed tower central dividing plate (112), spray packed tower central dividing plate (112) accepts the shower water of spray heat exchange.The present invention obviously can reduce the electrical power of the blower fan of supplied flue gases and the water pump of conveying shower water, improves utilization efficiency of heat energy and energy-saving benefit.

Description

For the spray packed tower of flue gas waste heat recovery

Technical field

The present invention relates to a kind of spray packed tower for flue gas waste heat recovery, the spray packed tower that especially a kind of low-temperature flue gas waste heat for gas fired-boiler reclaims.

Background technology

Be widely used in the heat transmission equipment of device that low-temperature flue gas reclaims at present and mainly contain two kinds of modes: void tower spraying and flue gas direct contact heat transfer, and flue gas and refrigerant wall-type heat exchange.For the heat transmission equipment of the device that void tower spraying is reclaimed with the low-temperature flue gas of flue gas direct contact heat transfer, adopt and cooling water is sprayed into tiny mist pearl, tiny mist pearl is at void tower (or being called heat exchanger) and flue gas direct contact heat transfer, be characterized in cooling water to be sprayed into tiny mist pearl falling slowly in void tower, the mist pearl of usual atomisation about tens microns to below 1mm, mist pearl also needs the contact heat-exchanging time of landing at a slow speed in 5-10 second, mist pearl is excessive, and then heat transfer effect is poor with contact heat-exchanging deficiency of time, so just cause following several main aspects not enough: the mist pearl that (1) cooling water is sprayed into certain particle size range falling at a slow speed in void tower, then in tower, the flow resistance of the direct contact heat transfer of flue gas is fallen larger, usually 400-800Pa is had, some is even greater than 1000Pa, thus cause the electrical power consumed of flue gas air exhauster or air blast excessive, (2) cooling water needs to be sprayed into tiny mist pearl, water pump needs larger pressure head, because only spraying at least needs the pressure differential of 0.1MPa to drive (spray effect being generally 0.2-0.3MPa is better) usually, this just causes the electrical power consumed of water pump excessive, (3) the too small then easy mist pearl of the mist pearl of spraying in addition, thus cause environmental pollution and boiler flue corrosion etc., the excessive then heat transfer effect of mist pearl of spraying is poor, the inhomogeneities of consideration spraying and load variations cause the inhomogeneities of void tower flow field, the larger mist flow of usual employing is to improve the problems referred to above, but also simultaneously bring the problem that significantly increases of spraying pump consumption, and the lower and problem that causes utilization rate of waste heat lower of the leaving water temperature of misting cooling water, (4) void tower spraying is very uneven with flue gas flow field in the tower of flue gas direct contact heat transfer, it is more obvious when particularly load off-design is larger, in tower, occur serious flue gas bias current and backflow in some situation, this unstability just causing system waste heat to utilize and efficiency significantly descend degradation problem.For the heat transmission equipment of the device that the low-temperature flue gas of flue gas and refrigerant wall-type heat exchange reclaims, adopt heat exchanger tube or heat pipe as heat exchange element, flue gas and refrigerant (being generally water) are separated (directly not contacting), because the convection transfer rate of flue gas is smaller, usual employing fin increases heat exchange area and enhanced heat exchange, and have a large amount of condensed waters containing a large amount of dusts and corrosive substance and flue gas at temperature-fall period in flue gas, thus cause fin seriously corroded, blocking and fouling, not only heat transfer effect is poor but also equipment life is shorter, also to have and do not adopt fin to alleviate the problems referred to above and adopt light pipe, but equipment investment significantly increases, in addition, water resistance and the flue gas flow resistance of the heat transmission equipment of the device of the low-temperature flue gas recovery of this class formation are also all very large, namely the electrical power consumed of water pump and blower fan is all larger, energy-saving benefit is by the obvious effect of high power consumption.In addition, no matter prior art, be the formula heat exchange of void tower plume contact or wall-type heat exchange, be all difficult to the discharge obviously reducing the pollutants such as nitrogen oxide.

In sum, in prior art, at least there is following problem: it is comparatively large that void tower spraying direct contact heat transfer exists blower and water pump pressure head, and the power consumption of blower and water pump is too high; In addition, also have the leaving water temperature of misting cooling water lower and cause utilization rate of waste heat lower, in tower, flue gas flow field is very uneven even there is serious flue gas bias current and backflow in some situation in tower, and the unstability causing system waste heat to utilize and efficiency significantly descend degradation problem; Flue gas and refrigerant wall-type heat exchange is also had to there is seriously corroded, blocking and fouling, and the problem that equipment investment is large, the life-span is short; Be difficult to the problem of the discharge obviously reducing the pollutants such as nitrogen oxide.

Summary of the invention

The invention provides a kind of spray packed tower for flue gas waste heat recovery, to solve the deficiencies in the prior art.

For this reason, the present invention proposes a kind of spray packed tower for flue gas waste heat recovery, it is characterized in that, the described spray packed tower for flue gas waste heat recovery comprises: spray packed tower main body 1, spray assemblies 2, filler 3, dehydrater 4, blower fan 7, flue and oxidizer distributor 9, wherein:

Described spray packed tower main body 1 comprises: the spray packed tower body junction component 11 of spray packed tower shell body 111, spray packed tower central dividing plate 112, packing support plate 113 and dehydrater gripper shoe 114 composition, and the spray packed tower body interface arranged on spray packed tower body junction component 11;

Described spray packed tower body interface comprises: smoke inlet 121, exhanst gas outlet 122, Sprayer Circulation water out 123, Sprayer Circulation water inlet 124, alkali lye outlet 125, manhole 126, alkali input port 127, shower water overfall 128, be communicated with combination adapter 129 up and down, described manhole 126 comprises the lower manhole 1261 of the storage alkali Space Facilities Components installation repair and maintenance of the spray packed tower bottom for flue gas waste heat recovery, enter and store manhole 1262 in shower water Space Facilities Components installation repair and maintenance for the flue gas in the middle part of the spray packed tower of flue gas waste heat recovery and for the filler on the spray packed tower top of flue gas waste heat recovery and the upper manhole 1263 of spray Space Facilities Components installation repair and maintenance, so that the installation of spray packed tower body interior element of installation and maintenance, safeguard,

Described spray packed tower shell body 111 is circle hull shape shell structure, by circular cylinder body, upper ellipsoidal head and composition of going to the bottom, spray packed tower central dividing plate 112 is provided with from bottom to up in spray packed tower shell body 111, packing support plate 113 and dehydrater gripper shoe 114, spray packed tower shell body 111 inner chamber is separated for heat transfer space YQ is drenched in bottom alkali storage space JY and upper smoke gas blowout by described spray packed tower central dividing plate 112, spray packed tower central dividing plate 112 accepts the shower water that the spray heat exchange of heat transfer space YQ is drenched in upper smoke gas blowout, described bottom alkali storage space JY and described upper smoke gas blowout are drenched heat transfer space YQ and are communicated with combination adapter 129 are up and down communicated with to realize pouring water and the function such as pressure balance of alkali storage space, bottom JY by described,

Described bottom alkali storage space JY is used for storing alkali lye, described alkali lye is for neutralizing acidic materials in the shower water of condensation from flue gas to ensure the qualified discharge of shower water of discharging, described bottom alkali storage space JY is provided with alkali lye outlet 125 and alkali input port 127, alkali face or alkali lye drop into from alkali input port 127, the alkali lye stored at alkali storage space, bottom JY can according to the acid-base value of the shower water detected and requiring exported by alkali lye 125 deliver in the pipeline be connected with Sprayer Circulation water inlet 124 with Sprayer Circulation water out 123 with in reach with Sprayer Circulation water middle acid substance and discharge and the requirement of equipment anticorrosion, in alkali storage space, bottom, JY is also provided with bottom manhole 1261 so that repair and maintenance,

Described upper smoke gas blowout is drenched heat transfer space YQ and is used for flue gas heat exchange, described upper smoke gas blowout is drenched heat transfer space YQ and is provided with packing support plate 113, packing support plate 113 and spray packed tower shell body 111 connect as one, packing support plate 113 is placed with filler 3, the top of filler 3 is provided with spray assemblies 2, spray assemblies 2 is provided with the Sprayer Circulation water inlet 124 be communicated to outside spray packed tower shell body 111, adapter and the spray packed tower shell body 111 of Sprayer Circulation water inlet 124 connect as one, spray assemblies 2 is provided with dehydrater gripper shoe 114, dehydrater gripper shoe 114 and spray packed tower shell body 111 connect as one, dehydrater 4 is placed with in dehydrater gripper shoe 114,

The spray packed tower shell body 111 of the bottom of described packing support plate 113 is provided with smoke inlet 121, smoke inlet 121 connects the pipeline 81 that flue gas enters spray packed tower, the pipeline 81 entering spray packed tower at flue gas is provided with oxidizer distributor 9, the oxidant inlet 91 that the oxidant that NO in flue gas can be oxidized to NO2 is arranged from distributor 9 inputs, and described oxidant selects ozone or peroxide water;

The spray packed tower shell body 111 of the bottom of described smoke inlet 121 is provided with Sprayer Circulation water out 123, Sprayer Circulation water is extracted out from Sprayer Circulation water out 123, spray packed tower shell body 111 between Sprayer Circulation water out 123 and smoke inlet 121 is provided with shower water overfall 128, when with shower water 5 from after spray assemblies 2 sprays through filler 3 under drop in filler 3 and carry out heat exchange with the flue gas flowed from bottom to top, the temperature of flue gas reduces and the temperature of shower water 5 raises, water vapour simultaneously in flue gas is by most of condensation, and SOx and NOx in flue gas is absorbed by shower water 5 and is added into the neutralization of shower water 5 neutral and alkali material for salt, can be passed through the rear qualified discharge of process,

Described flue comprises, and the pipeline 81 that the flue gas be connected with described smoke inlet 121 enters spray packed tower and the flue gas be connected with exhanst gas outlet 122 go out the pipeline 82 of spray packed tower.

Further, described spray packed tower central dividing plate 112 is local subsidence near described Sprayer Circulation water out 123, both can ensure that the water level extracting shower water out also can reduce device height to reduce costs simultaneously.

Further, described smoke inlet 121 is set for the eccentric, and flue gas is distributed in filler more even, obtains better heat exchange property.

Further, described spray assemblies 2 is the spray structure of spinning, obviously can improve the sprinkling uniformity of border circular areas, the spray assemblies 2 of described self-rotation is made up of multiple rotation spray shower pipe 21, central dispense and rotary support assembly 22 and outer connecting pipe road 23 etc.

Further, described filler 3 is ripple packing, and ripple packing specific area selects 100-500m 2/ m, ripple packing selects stainless steel or plastics.

Further, described blower fan 7 and flue gas enter the pipeline 82 that the pipeline 81 of spray packed tower or flue gas go out spray packed tower and are connected.

A kind of spray packed tower for flue gas waste heat recovery of the present invention, shower water passes through filler and the flue gas direct contact heat transfer of bigger serface, significantly increase stable contact heat-exchanging area and the time of contact of gas-liquid two-phase, significantly improve efficiency and the stability of gas-liquid heat exchange, significantly reduce smoke flow resistance, also the shower water flow of the pressure of shower water is considerably reduced, essentially eliminate the bias current of flow of flue gas and the impact of eddy current of spraying void tower technology, turn avoid the tower body vibration caused thus, thus increase the service life of tower, strengthen the security reliability of tower, also can improve the temperature 5-20 DEG C of heat exchange condensed water, thus obviously can reduce the electrical power of the blower fan of supplied flue gases and the water pump of conveying shower water on the one hand, the electrical power 30-50% that usually can save blower and water pump even waits many, also can improve waste heat utilization equipment as the service behaviour of heat pump and working range on the other hand, obtain more excellent energy-saving benefit.

The present invention also by arranging oxidizer distributor and add oxidant in flue gas on gas approach pipeline, and alkali storage space is set in the spray packed tower of flue gas waste heat recovery and in automatic alkali adding in shower water and flue gas in acidic materials, the filler of the bigger serface in packed tower additionally provides the reaction of acidic materials and the area of absorption and time, thus on the one hand through the flue gas of this technical finesse and the discharge more environmental protection of condensed water, flue gas middle acid substance almost can reach zero-emission, also the corrosion of equipment can be avoided on the other hand, fouling, blocking etc., in the reliability of extension device with while the life-span, decrease the cost of maintenance maintenance, but also significantly improve the utilization rate of waste heat of the longtime running of equipment.

Accompanying drawing explanation

Fig. 1 is the structural representation of the spray packed tower for flue gas waste heat recovery of the embodiment of the present invention one.

Fig. 2 shows the structure of spray assemblies from overlooking direction.

Fig. 3 is the operation principle schematic diagram of the spray packed tower for flue gas waste heat recovery of the embodiment of the present invention one.

Fig. 4 is the structural representation of the spray packed tower for flue gas waste heat recovery of the embodiment of the present invention two.

Drawing reference numeral illustrates:

1-spray packed tower main body, 11-spray packed tower body junction component, 111-spray packed tower shell body, 112-spray packed tower central dividing plate, 113-packing support plate, 114-dehydrater gripper shoe, 121-smoke inlet, 122-exhanst gas outlet, 123-Sprayer Circulation water out, 124-Sprayer Circulation water inlet, 125-alkali lye exports, 126-manhole, 1261-lower manhole, 1262-middle manhole, 1263-upper manhole, 127-alkali input port, 128-shower water overfall, 129-be communicated with combination adapter up and down, 2-spray assemblies, 21-rotation spray shower pipe, 22-central dispense and rotary support assembly, 23-outer connecting pipe road, 3-filler, 4-dehydrater, 5-shower water, liquid level on 51-shower water, 6-alkali lye, liquid level on 61-alkali lye, 7-blower fan, 81-flue gas enters the pipeline of spray packed tower, 82-flue gas goes out the pipeline of spray packed tower, 9-oxidizer distributor, 91-oxidant inlet.

S-shower water flow direction, Y-flow of flue gas direction, JY-alkali storage space, heat transfer space is drenched in YQ-upper smoke gas blowout.

Detailed description of the invention

In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the present invention is described.

Embodiment one

As depicted in figs. 1 and 2, the present invention proposes a kind of spray packed tower for flue gas waste heat recovery, it is characterized in that, the described spray packed tower for flue gas waste heat recovery comprises: the compositions such as spray packed tower main body 1, spray assemblies 2, filler 3, dehydrater 4, blower fan 7, flue and oxidizer distributor 9, wherein:

Described spray packed tower main body 1 comprises: the spray packed tower body junction component 11 of spray packed tower shell body 111, spray packed tower central dividing plate 112, packing support plate 113 and dehydrater gripper shoe 114 composition, and the spray packed tower body interface arranged on spray packed tower body junction component 11;

Described spray packed tower body interface comprises: smoke inlet 121, exhanst gas outlet 122, Sprayer Circulation water out 123, Sprayer Circulation water inlet 124, alkali lye outlet 125, manhole 126, alkali input port 127, shower water overfall 128, be communicated with combination adapter 129 up and down, manhole 126 comprises the lower manhole 1261 of the storage alkali Space Facilities Components installation repair and maintenance of the spray packed tower bottom for flue gas waste heat recovery, enter and store manhole 1262 in shower water Space Facilities Components installation repair and maintenance for the flue gas in the middle part of the spray packed tower of flue gas waste heat recovery and for the filler on the spray packed tower top of flue gas waste heat recovery and the upper manhole 1263 of spray Space Facilities Components installation repair and maintenance, so that the installation of spray packed tower body interior element of installation and maintenance, safeguard, described spray packed tower body interface is the total interface arranged on spray packed tower body junction component 11, simple and clear in order to implement legend, does not mark the label of spray packed tower body interface in the drawings.

Described spray packed tower shell body 111 is circle hull shape shell structure, by circular cylinder body, upper ellipsoidal head and composition (not marking piece number in figure) of going to the bottom, spray packed tower central dividing plate 112 is provided with from bottom to up in spray packed tower shell body 111, packing support plate 113 and dehydrater gripper shoe 114, spray packed tower shell body 111 inner chamber is separated for heat transfer space YQ is drenched in bottom alkali storage space JY and upper smoke gas blowout by described spray packed tower central dividing plate 112, spray packed tower central dividing plate 112 accepts the shower water that the spray heat exchange of heat transfer space YQ is drenched in upper smoke gas blowout, described bottom alkali storage space JY and described upper smoke gas blowout are drenched heat transfer space YQ and are communicated with combination adapter 129 are up and down communicated with to realize pouring water and the function such as pressure balance of alkali storage space, bottom JY by described,

Described bottom alkali storage space JY is used for storing alkali lye, described alkali lye is for neutralizing acidic materials in the shower water of condensation from flue gas to ensure the qualified discharge of shower water of discharging, described bottom alkali storage space JY is provided with alkali lye outlet 125 and alkali input port 127, alkali face or alkali lye drop into from alkali input port 127, the alkali lye stored at alkali storage space, bottom JY can according to the acid-base value of the shower water detected and requiring exported by alkali lye 125 deliver in the pipeline be connected with Sprayer Circulation water inlet 124 with Sprayer Circulation water out 123 with in reach with Sprayer Circulation water middle acid substance and discharge and the requirement of equipment anticorrosion, in alkali storage space, bottom, JY is also provided with bottom manhole 1261 so that repair and maintenance,

Described upper smoke gas blowout is drenched heat transfer space YQ and is used for flue gas heat exchange, described upper smoke gas blowout is drenched heat transfer space YQ and is provided with packing support plate 113, packing support plate 113 and spray packed tower shell body 111 connect as one, packing support plate 113 is placed with filler 3, the thickness 0.5-3m of filler 3, the top of filler 3 is provided with spray assemblies 2, spray assemblies 2 is provided with the Sprayer Circulation water inlet 124 be communicated to outside spray packed tower shell body 111, adapter and the spray packed tower shell body 111 of Sprayer Circulation water inlet 124 connect as one, spray assemblies 2 is provided with dehydrater gripper shoe 114, dehydrater gripper shoe 114 and spray packed tower shell body 111 connect as one, dehydrater 4 is placed with in dehydrater gripper shoe 114,

The spray packed tower shell body 111 of the bottom of described packing support plate 113 is provided with smoke inlet 121, smoke inlet 121 is connected with blower fan 7, the pipeline 81 that the other end and the flue gas of blower fan 7 enter spray packed tower is connected, the pipeline 81 entering spray packed tower at flue gas is provided with oxidizer distributor 9, the oxidant inlet 91 that the oxidant that NO in flue gas can be oxidized to NO2 is arranged from distributor 9 inputs, and described oxidant selects ozone or peroxide water;

The spray packed tower shell body 111 of the bottom of described smoke inlet 121 is provided with Sprayer Circulation water out 123, Sprayer Circulation water is extracted out from Sprayer Circulation water out 123, spray packed tower shell body 111 between Sprayer Circulation water out 123 and smoke inlet 121 is provided with shower water overfall 128, when with shower water 5 from after spray assemblies 2 sprays through filler 3 under drop in filler 3 and carry out heat exchange with the flue gas flowed from bottom to top, the temperature of flue gas reduces and the temperature of shower water 5 raises, water vapour simultaneously in flue gas is by most of condensation, and SOx in flue gas (SOx is sulfur oxide, be such as sulfur dioxide) and NOx (nitrogen oxide, such as nitric oxide) through oximeter oxidation and to be absorbed by shower water 5 and be added into shower water 5 neutral and alkali material (being generally NaOH or NaCO3) neutralization be neutral salt, qualified discharge after treatment.Thus through the flue gas of the process of the present embodiment, discharge more environmental protection, almost can reach zero-emission.

Fig. 3 is the fundamental diagram of the spray packed tower of the flue gas waste heat recovery of the present embodiment one.Enter the pipeline 81 of spray packed tower through flue gas from the flue gas of boiler or chimney, after mixing with the oxidant sprayed into by the oxidizer distributor 9 be arranged on pipeline 81, flue gas at a middle or low price nitrogen oxide and low price sulfur oxide is oxidized to high oxide, then send into smoke inlet 121 through blower fan 7 and enter the upper smoke gas blowout pouring heat transfer space YQ in spray packed tower shell body 111, flue gas flows through filler 3 and shower water heat exchange in filler of flowing out through spray assemblies 2 again, flue gas while temperature reduces in flue gas a large amount of condensed water be condensed and release a large amount of condensation heat, the temperature of shower water shower water after the sensible heat absorbing flue gas and latent heat raises, simultaneously owing to containing certain density alkaline matter (PH>7) in shower water, shower water absorbs SO2 and NO2 in flue gas and is converted into neutral salt, the shower water that the shower water heated up falls into bottom upper smoke gas blowout pouring heat transfer space YQ stores water tank, then the Sprayer Circulation water out 123 through being arranged on bottom is drawn to waste heat utilization equipment and utilizes, as heat pump, heat exchanger, through with waste heat utilization equipment heat exchange after the temperature of shower water reduce and be delivered to Sprayer Circulation water inlet 124 and spraying through spray assemblies 2, circulation like this, and the flue gas of cooling and dehumidification upwards flows through dehydrater 4 in filler, collected by tiny drops of water in flue gas, then flow through the exhanst gas outlet 122 on spray packed tower shell body 111 top, the pipeline 82 going out spray packed tower through flue gas is discharged in chimney or air.Both obtained the object that low-temperature flue gas waste heat reaches energy-conservation in the process, and gone back the discharge of particle in the discharge and flue gas simultaneously significantly reducing SOx and NOx, obtain the environment protecting of the discharge of significant decreasing pollution thing.

Described flue comprises, and the pipeline 81 that the flue gas be connected with described smoke inlet 121 enters spray packed tower and the flue gas be connected with exhanst gas outlet 122 go out the pipeline 82 of spray packed tower.Simple and clear in order to implement legend, do not mark the label of flue in the drawings.

Further, in order to ensure the extraction performance with the water pump of Sprayer Circulation water out 123, to need to ensure bottom spray packed tower shell body 111 that water storage water level (on shower water liquid level 51) can not too low in order to avoid suction air and occur the problems such as cavitation erosion, on the shower water namely stored bottom spray packed tower shell body 111, liquid level 51 highly can not be too low to flooding of Sprayer Circulation water out 123, but liquid level 51 can not reach smoke inlet 121 on the shower water stored bottom spray packed tower shell body 111, otherwise will shower water be stored and cause a series of problem in flue.The present embodiment adopts sunk type cisten mechanism, namely in spray packed tower central dividing plate 112 local subsidence near Sprayer Circulation water out 123 accepting shower water, spray packed tower central dividing plate 112 sinks at Sprayer Circulation water out place in other words, or a part of spray packed tower central dividing plate is positioned under Sprayer Circulation water out, both can ensure that the water level extracting shower water out also can reduce device height to reduce costs simultaneously.

Further, in order to improve flue gas uniformity in filler, smoke inlet 121 is set for the eccentric, the distance A that namely smoke inlet 121 is certain with the misalignment of spray packed tower shell body 111, as shown in Figure 2.The smoke inlet 121 of eccentric setting, rotating in a circumferential direction at spray packed tower shell body 111 after making flue gas enter spray packed tower shell body 111 from smoke inlet 121, thus it is more even to make flue gas distribute in filler, obtain better heat exchange property (such as arranging relative to centered by smoke inlet 121).

Further, in order to ensure that spray assemblies 2 is sprayed at the uniformity of the shower water on filler 3, the present embodiment have employed the spray structure of spinning, produce spinning due to the effect of the propulsive thrust of shower water when namely shower water sprays via spray assemblies 2, the spray assemblies 2 of self-rotation obviously can improve the sprinkling uniformity of border circular areas simultaneously.The spray assemblies 2 of described self-rotation is made up of multiple rotation spray shower pipe 21, central dispense and rotary support assembly 22 and outer connecting pipe road 23 etc.Outer connecting pipe road 23 is connected with spray packed tower shell body 111, the outer end in outer connecting pipe road 23 connects Sprayer Circulation water inlet 124, the inner in outer connecting pipe road 23 connects central dispense and rotary support assembly 22, central dispense and rotary support assembly 22 are connected with multiple rotation spray shower pipe 21 again, central dispense and rotary support assembly 22 are provided with bearing assembly connected multiple rotation spray shower pipe 21 can be rotated around pivot.The present embodiment is that 4 rotation spray shower pipes 21 are connected with rotary support assembly 22 with central dispense.Its operation principle is: shower water enters outer connecting pipe road 23 from Sprayer Circulation water inlet 124, then being assigned to multiple rotation spray shower pipe 21 through central dispense and rotary support assembly 22, being finally evenly sprayed onto on filler 3 by multiple rotation spray shower pipe 21 being arranged intensive spray hole; Rotation spray shower pipe 21 arranges intensive spray hole, and this intensive spray hole for opposite side in the side of direction of rotation, produces a rotary thrust to rotation spray shower pipe 21 like this and makes rotation spray shower pipe 21 produce rotation in sprinkling process; Rotate and to spray and rationally to arrange the shower water that intensive spray hole makes to be sprayed on filler more even, particularly the sprinkling of border circular areas is especially even.

Further, the present embodiment selects ripple packing, and ripple packing specific area selects 100-500m 2/ m 3, the flue gas pressure reduction of packing layer is at about 100-200Pa.Concrete, select specific area 250m 2/ m 3stainless steel ripple packing, ripple packing height 1.5m, experiment records the about 150Pa of flow of flue gas Pressure Drop in filler.The filler of the present embodiment is the heat exchange surface as flue gas, as long as shower water is evenly sprayed in filler can obtain excellent stable heat transfer effect with the temperature maintaining filling surface, flue gas is larger with the contact area of filling surface, while obtaining excellent heat transfer effect, the flow resistance of flue gas in filler is less, and the acidic materials in flue gas also absorbed than the spray water film being easier to filled surface.And for void tower spraying and flue gas direct contact heat transfer, flue gas carries out contact heat-exchanging with the surface swimming in small mist pearl in flue gas, reach identical contact heat-exchanging area and heat transfer effect, spray diameter is greatly about 50 microns, the small mist pearl of spraying also at least stopped for 5 seconds in void tower, then the flue gas pressure reduction of this situation is at 400-600Pa, and mist pearl water being sprayed into about 50 microns at least needs to consume the spray water pump head of 0.2MPa, and the flow of water pump that needs of spraying void tower relatively and spray packed tower to increase 30-50%.On the one hand, a kind of spray packed tower for flue gas waste heat recovery due to the present embodiment reaches same heat transfer effect can adopt less spray flow, then with flue gas heat exchange after the temperature rise of shower water can improve 5-20 degree, thus waste heat utilization equipment can be significantly improved as the service behaviour of heat pump and working range; On the other hand, because the flow of the water pump of the conveying shower water of a kind of spray packed tower for flue gas waste heat recovery of the present embodiment and pressure head all obviously reduce, the pressure head of blower fan also reduces significantly, thus a kind of conveying fan of the spray packed tower for flue gas waste heat recovery of the present embodiment and the electrical power of water pump, spray compared with flue gas direct contact heat transfer mode with void tower, the electrical power 30-50% that can save blower and water pump even waits many, and energy-saving effect is obvious.

Further, a kind of spray packed tower for flue gas waste heat recovery of the present embodiment selects ripple packing, it is all more balanced how waste heat recovery thermic load changes the flow resistance of flue gas in ripple packing, there will not be the bias current of flue gas in tower and the problem of backflow of void tower spraying direct contact heat transfer, and filling surface to amass reliable and stable namely heat exchange property reliable and stable, thus the stability of UTILIZATION OF VESIDUAL HEAT IN is all relative with the efficiency of UTILIZATION OF VESIDUAL HEAT IN significantly improves.And bias current and backflow not only may be there is in void tower spraying direct contact heat transfer in tower, it is especially outstanding when particularly recuperation of heat load off-design is larger, and its spray effect significantly affects heat transfer effect and heat recovery efficiency, because the surface area that void tower spraying direct contact heat transfer is the small mist pearl of spraying provides the heat transfer sheet area of contact heat-exchanging, and spray effect unavoidably there will be fluctuation in During Process of Long-term Operation, or part of spray equipment During Process of Long-term Operation probably block even damage etc. and spray effect is deteriorated, thus the problem such as the stable not and thermal efficiency fluctuation of the waste heat recovery performance of void tower spraying direct contact heat transfer just a kind of spray packed tower for flue gas waste heat recovery of relative the present embodiment.The present embodiment essentially eliminates the bias current of the flow of flue gas of void tower and the impact of eddy current, avoids the tower body vibration caused thus, thus increases the service life of tower, strengthen the security reliability of tower.

Further, the stainless steel that a kind of spray packed tower for flue gas waste heat recovery of the present embodiment selects corrosion resistance high or plastic ripple filler, and the acid-base value of shower water can be ensured by the method arranging automatic alkali adding neutralization, thus the problem of system corrosion, blocking and fouling can be eliminated, the reliability of equipment is high, and the life-span is long.

Further, flue-gas temperature 90 degree of freedom of the smoke inlet 121 of a kind of spray packed tower for flue gas waste heat recovery of the present embodiment, the flue-gas temperature of flue gas through being discharged by the exhanst gas outlet 122 on spray packed tower shell body 111 top after filler 3 with shower water heat exchange is about 30 degree, simultaneously, in flue gas SOx and NOx through oxidizing and in filler fully with contain in and the alkali substance reaction of acidic materials and absorption, in flue gas, graininess dust is also absorbed by shower water, and the flue gas that exhanst gas outlet 122 is discharged can reach excellent discharge standard.A kind of spray packed tower for flue gas waste heat recovery of the present embodiment, the waste heat (sensible heat and latent heat) absorbing low-temperature flue gas on the one hand reclaims condensed water simultaneously and obtains excellent energy-saving effect, denitration desulfurization and dedusting and automatic alkali adding technique can also be taken into account on the other hand, there is more excellent environmental benefit.

Further, in order to reduce the radiation loss of bootstrap system, the spray packed tower and feed-line etc. of flue gas waste heat recovery are incubated.In order to legend is simple and clear, implement in illustration as marking insulation.

In sum, a kind of spray packed tower for flue gas waste heat recovery of the present invention, tool has the following advantages:

(1) a kind of spray packed tower for flue gas waste heat recovery of the present invention, shower water passes through filler and the flue gas direct contact heat transfer of bigger serface, significantly increase stable contact heat-exchanging area and the time of contact of gas-liquid two-phase, significantly improve efficiency and the stability of gas-liquid heat exchange, significantly reduce smoke flow resistance, also the shower water flow of the pressure of shower water is considerably reduced, essentially eliminate the bias current of flow of flue gas and the impact of eddy current of spraying void tower technology, turn avoid the tower body vibration caused thus, thus increase the service life of tower, strengthen the security reliability of tower, also can improve the temperature 5-20 DEG C of heat exchange condensed water, thus obviously can reduce the electrical power of the blower fan of supplied flue gases and the water pump of conveying shower water on the one hand, the electrical power 30-50% that usually can save blower and water pump even waits many, also can improve waste heat utilization equipment as the service behaviour of heat pump and working range on the other hand, obtain more excellent energy-saving benefit.

(2) the present invention also by arranging oxidizer distributor and add oxidant in flue gas on gas approach pipeline, and alkali storage space is set in the spray packed tower of flue gas waste heat recovery and in automatic alkali adding in shower water and flue gas in acidic materials, the filler of the bigger serface in packed tower additionally provides the reaction of acidic materials and the area of absorption and time, thus on the one hand through the flue gas of this technical finesse and the discharge more environmental protection of condensed water, flue gas middle acid substance almost can reach zero-emission, also the corrosion of equipment can be avoided on the other hand, fouling, blocking etc., in the reliability of extension device with while the life-span, decrease the cost of maintenance maintenance, but also significantly improve the utilization rate of waste heat of the longtime running of equipment.

Embodiment two

Fig. 4 is the structural representation of the spray packed tower for flue gas waste heat recovery of the embodiment of the present invention two.The present embodiment two is not both with embodiment one, and the pipeline 81 that blower fan 7 and the flue gas of embodiment one enter spray packed tower is connected, and the pipeline 82 that the blower fan 7 of the present embodiment two and flue gas go out spray packed tower is connected.Higher but the flue gas of the temperature of the supplied flue gases in the blower fan 7 of embodiment one does not also reach capacity, advantage is that the flue gas of conveying can not condense and corrode less, its deficiency is that the flue-gas temperature of conveying is higher, and transfer efficiency can reduce, and temperature height also needs to consider to the problem that equipment belt serves heat radiation.Lower but the flue gas of the temperature of the supplied flue gases in the blower fan 7 of embodiment two reaches capacity; advantage is that the lower then transfer efficiency of flue-gas temperature of conveying is higher; the heat radiation considering equipment especially is not needed yet; its deficiency is that the flue gas carried exists condensation and corrosion, needs to consider that electricity is become attached to and protects and anticorrosive measure.

The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.For each part of the present invention can mutually combine under the condition of not conflicting, any those skilled in the art, the equivalent variations made under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.

Claims (6)

1. the spray packed tower for flue gas waste heat recovery, it is characterized in that, the described spray packed tower for flue gas waste heat recovery comprises: spray packed tower main body (1), spray assemblies (2), filler (3), dehydrater (4), blower fan (7), flue and oxidizer distributor (9), wherein:
Described spray packed tower main body (1) comprising: the spray packed tower body junction component (11) that spray packed tower shell body (111), spray packed tower central dividing plate (112), packing support plate (113) and dehydrater gripper shoe (114) form, and in the upper spray packed tower body interface arranged of spray packed tower body junction component (11);
Described spray packed tower body interface comprises: smoke inlet (121), exhanst gas outlet (122), Sprayer Circulation water out (123), Sprayer Circulation water inlet (124), alkali lye outlet (125), manhole (126), alkali input port (127), shower water overfall (128), be communicated with combination adapter (129) up and down, described manhole (126) comprises the lower manhole (1261) of the storage alkali Space Facilities Components installation repair and maintenance of the spray packed tower bottom for flue gas waste heat recovery, enter and store manhole (1262) in shower water Space Facilities Components installation repair and maintenance for the flue gas in the middle part of the spray packed tower of flue gas waste heat recovery and for the filler on the spray packed tower top of flue gas waste heat recovery and the upper manhole (1263) of spray Space Facilities Components installation repair and maintenance, so that the installation of spray packed tower body interior element of installation and maintenance, safeguard,
Described spray packed tower shell body (111) is circle hull shape shell structure, by circular cylinder body, upper ellipsoidal head and composition of going to the bottom, spray packed tower central dividing plate (112) is provided with from bottom to up in spray packed tower shell body (111), packing support plate (113) and dehydrater gripper shoe (114), spray packed tower shell body (111) inner chamber is separated for heat transfer space (YQ) is drenched in alkali storage space, bottom (JY) and upper smoke gas blowout by described spray packed tower central dividing plate (112), spray packed tower central dividing plate (112) accepts the shower water that the spray heat exchange of heat transfer space (YQ) is drenched in upper smoke gas blowout, alkali storage space, described bottom (JY) and described upper smoke gas blowout are drenched heat transfer space (YQ) and are communicated with combination adapter (129) connection up and down to realize pouring water and pressure balance function of alkali storage space, bottom (JY) by described,
Alkali storage space, described bottom (JY) is used for storing alkali lye, described alkali lye is for neutralizing acidic materials in the shower water of condensation from flue gas to ensure the qualified discharge of shower water of discharging, alkali lye outlet (125) and alkali input port (127) is provided with in alkali storage space, described bottom (JY), alkali face or alkali lye drop into from alkali input port (127), the alkali lye stored in alkali storage space, bottom (JY) can according to the acid-base value of the shower water detected and require by alkali lye export (125) deliver in the pipeline be connected with Sprayer Circulation water inlet (124) with Sprayer Circulation water out (123) with in reach with Sprayer Circulation water middle acid substance and discharge and the requirement of equipment anticorrosion, bottom manhole (1261) is also provided with so that repair and maintenance in alkali storage space, bottom (JY),
Described upper smoke gas blowout is drenched heat transfer space (YQ) and is used for flue gas heat exchange, described upper smoke gas blowout is drenched heat transfer space (YQ) and is provided with packing support plate (113), packing support plate (113) and spray packed tower shell body (111) connect as one, packing support plate (113) is placed with filler (3), the top of filler (3) is provided with spray assemblies (2), spray assemblies (2) is provided with and is communicated to spray packed tower shell body (111) Sprayer Circulation water inlet (124) outward, adapter and the spray packed tower shell body (111) of Sprayer Circulation water inlet (124) connect as one, spray assemblies (2) is provided with dehydrater gripper shoe (114), dehydrater gripper shoe (114) and spray packed tower shell body (111) connect as one, dehydrater (4) is placed with in dehydrater gripper shoe (114),
The spray packed tower shell body (111) of the bottom of described packing support plate (113) is provided with smoke inlet (121), the pipeline (81) of spray packed tower is entered at smoke inlet (121) upper connection flue gas, the pipeline (81) entering spray packed tower at flue gas is provided with oxidizer distributor (9), NO in flue gas is oxidized to NO 2oxidant inlet (91) input that arranges from distributor (9) of oxidant, described oxidant selects ozone or peroxide water;
The spray packed tower shell body (111) of the bottom of described smoke inlet (121) is provided with Sprayer Circulation water out (123), Sprayer Circulation water is extracted out from Sprayer Circulation water out (123), spray packed tower shell body (111) between Sprayer Circulation water out (123) and smoke inlet (121) is provided with shower water overfall (128), when with shower water (5) from after spray assemblies (2) sprays through filler (3) under drop in filler (3) and carry out heat exchange with the flue gas flowed from bottom to top, the temperature of flue gas reduces and the temperature of shower water (5) raises, water vapour simultaneously in flue gas is by most of condensation, and the acidic materials in flue gas are absorbed by shower water (5) and are added into the neutralization of shower water (5) neutral and alkali material for salt, can be passed through the rear qualified discharge of process,
Described flue comprises, and the pipeline (81) that the flue gas be connected with described smoke inlet (121) enters spray packed tower and the flue gas be connected with exhanst gas outlet (122) go out the pipeline (82) of spray packed tower.
2. as claimed in claim 1 for the spray packed tower of flue gas waste heat recovery, it is characterized in that, described spray packed tower central dividing plate (112) is local subsidence near described Sprayer Circulation water out (123), and the water level both having ensured to extract out shower water also reduces device height to reduce costs simultaneously.
3., as claimed in claim 1 for the spray packed tower of flue gas waste heat recovery, it is characterized in that, described smoke inlet (121) is set for the eccentric, and flue gas is distributed in filler more even, obtains better heat exchange property.
4. as claimed in claim 1 for the spray packed tower of flue gas waste heat recovery, it is characterized in that, the spray structure that described spray assemblies (2) is spinning, improve the sprinkling uniformity of border circular areas, the spray assemblies (2) of described self-rotation is made up of multiple rotation spray shower pipe (21), central dispense and rotary support assembly (22) and outer connecting pipe road (23).
5., as claimed in claim 1 for the spray packed tower of flue gas waste heat recovery, it is characterized in that, described filler (3) is ripple packing, and ripple packing specific area selects 100-500m 2/ m 3, ripple packing selects stainless steel or plastics.
6. as claimed in claim 1 for the spray packed tower of flue gas waste heat recovery, it is characterized in that, described blower fan (7) and flue gas enter the pipeline (82) that the pipeline (81) of spray packed tower or flue gas go out spray packed tower and are connected.
CN201410397395.3A 2014-08-13 2014-08-13 For the spray packed tower of flue gas waste heat recovery CN104174274B (en)

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CN104492241B (en) * 2014-12-16 2016-05-18 河北英都气化有限公司 A kind of high-effect desulfurizing tower
CN105498258B (en) * 2015-12-31 2018-01-12 山东金朗生物科技有限公司 A kind of spray drying system
CN107899399A (en) * 2017-11-25 2018-04-13 北京亿玮坤节能科技有限公司 A kind of low-temperature denitration technique of flue gas cleaning discharge
CN107983070A (en) * 2017-12-14 2018-05-04 广西庚源香料有限责任公司 A kind of humidifying processing unit for chemical industry tail gas
CN109224721B (en) * 2018-11-21 2019-09-10 上海聚丰热镀锌有限公司 A kind of flue gas scrubbing apparatus and method for washing flue gas

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EP0691156A2 (en) * 1994-07-05 1996-01-10 THE BABCOCK & WILCOX COMPANY Flue gas treatment
CN101362050A (en) * 2007-08-07 2009-02-11 涂建华 Flue-gas residual heat utilization device of wet desulfurization system
CN201618513U (en) * 2010-01-08 2010-11-03 山东新汶热电有限公司 Flue gas desulfurization and waste liquor treatment system for boilers
CN103721538A (en) * 2013-12-30 2014-04-16 清华大学 Integrated treatment and utilizing device for recovering and denitrating smoke waste heat and condensate water of natural gas

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Publication number Priority date Publication date Assignee Title
EP0691156A2 (en) * 1994-07-05 1996-01-10 THE BABCOCK & WILCOX COMPANY Flue gas treatment
CN101362050A (en) * 2007-08-07 2009-02-11 涂建华 Flue-gas residual heat utilization device of wet desulfurization system
CN201618513U (en) * 2010-01-08 2010-11-03 山东新汶热电有限公司 Flue gas desulfurization and waste liquor treatment system for boilers
CN103721538A (en) * 2013-12-30 2014-04-16 清华大学 Integrated treatment and utilizing device for recovering and denitrating smoke waste heat and condensate water of natural gas

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