CN1355061A

CN1355061A - Liquid flowing type seawater method for desulfurizing fume and its equipment

Info

Publication number: CN1355061A
Application number: CN 00131166
Authority: CN
Inventors: 彭斯干
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-11-23
Filing date: 2000-11-23
Publication date: 2002-06-26
Anticipated expiration: 2020-11-23
Also published as: CN1199712C

Abstract

A process for desulfurizing fume features that a power unit is used to directly accelerate the seawater flowing and mix air with it for desulphurizing the fame, and so quickly makes desulfurizing seawater recover its quality for higher efficiency. Its advantages include small occupied ground area, and low cost.

Description

Liquid flowing type seawater method for desulfurizing fume and equipment

Liquid flowing type seawater method for desulfurizing fume that the present invention relates to and equipment belong to environmental protection technical field, are applicable to the coastal industry device for preserving the ecological environment, control acid rain and sulfur dioxide pollution and the exhaust gas desulfurization technology of installing.

For preserving the ecological environment, the commercial plant institute discharged flue gas that uses fossil fuel must remove wherein a part or most of SO before entering atmosphere ₂, thereby need to adopt exhaust gas desulfurization technology.Most of exhaust gas desulfurization technologies have all been used with alkaline matter and have been absorbed acid SO in the flue gas ₂Principle.Because the exhaust gas volumn of modern big-and-middle-sized commercial plant is huge especially, the consumption of needed basic materials is also huge especially, thereby must adopt alkaline matter cheap, that the source is sufficient.Because natural sea-water is alkalescent, can be applicable to absorb sulfur dioxide on the principle.And can this principle become practical seawater desulfurizing process and practical level thereof, and can its key be and with economically viable method the desulfurization seawater have promptly been absorbed the acid seawater behind the sulfur dioxide, returns to the water quality that meets the environmental regulation requirement.

The desulfuration of flue gas by sea water technology that is applied to large-scale and super-huge coal-fired station that put into operation in 1999, adopted the aeration type seawater method for desulfurizing fume of patent No. ZL95119389, its desulfuration efficiency surpasses 90%, and cost and operating cost only are 1/3rd of traditional handicraft.This method usefulness seawater washs the SO in the flue gas in scrubbing tower ₂, the acid seawater after will washing is again sent in the quality recovery device, blasts air and carry out the aeration processing in seawater, and to recover the water quality of acid seawater, the seawater that will reach environmental quality requirement at last drains into natural environments such as marine site.Because this technology need not any chemical addition agent, thereby does not also have byproduct emission, so be a kind of flue gas desulfurization technique method of additional ambient influnence minimum.When being especially in use in a class such as coastal heat power station and just having extracted a large amount of seawater as the industrial plants of cooling water originally, desulfuration of flue gas by sea water technology has reduced operating cost significantly owing to need not extracting seawater separately and has become the typical process of comprehensive utilization natural resources.

But, because this technology is to adopt power facility such as air blast to quicken air to flow, the aeration method of air blast in seawater, its mass-transfer efficiency is lower, and power consumption is bigger than normal, and aeration time is long, thereby the floor space of aeration tank is difficult to reduce.This is unfavorable for the further raising of economic indicator on the one hand, and makes the factory of vacant lot deficiency be difficult to use seawater desulfurizing process.Under the increasingly serious situation of the situation of control acid rain and sulfur dioxide pollution, be necessary to overcome above-mentioned shortcoming, so that desulfuration of flue gas by sea water technology obtains using more widely.

The objective of the invention is to overcome the shortcoming that existing blast aeration formula seawater method for desulfurizing fume exists, provide a kind of can the high efficiency desulfurization, can reduce floor space again, further reduce the liquid flowing type seawater method for desulfurizing fume and the equipment of desulphurization cost.

The technical scheme of the inventive method is: it comprise extract seawater, with the seawer washing flue gas, seawater is mixed with air in order to recover acid seawater quality, reach the steps such as seawater that discharge meets the discharge standard; Recovering the step of acid seawater quality, is directly to quicken seawater with power set, and in this process entrained air.

The technical scheme that is applicable to the inventive method desulphurization plant is: it comprises seawater extraction element, flue washing device, quality recovery device and discharger, in the quality recovery device power set are installed, these power set are to sneak into device by liquid accelerator and air to constitute.

As previously mentioned, can the key of practical seawater desulfurizing process be and will have absorbed the acid restoring sea water behind the sulfur dioxide to meeting the water quality that environmental regulation requires with economically viable method.At present, Shi Yong method is that acid seawater is mixed with air the most, and this mixed process relates to the interphase mass transfer of Chemical Engineering, is gas-liquid mass transfer here.According to chemical industry mass transfer principle as can be known, in this gas-liquid mass transfer system, mass transport process need overcome the dual resistance of interface gas phase side and liquid side; Because the movement velocity of phase main body directly influences the resistance of its interface one side, therefore improve gas phase and liquid velocity all can reduce resistance.And the gas-liquid mass transfer that seawater desulfurizing process relates to, what start to control making usefulness in its system is the resistance of interface liquid phase one side, is typical liquid film control system.In the liquid film control system,, very little to the mass-transfer efficiency influence of further raising system if only depend on direct raising gas phase velocity promptly to adopt air blast to quicken the blast aeration method of gas flow rate.And adopt method and apparatus of the present invention directly to improve liquid velocity, promptly quicken liquid flow, then can start to control interface liquid phase one collateral resistance of making usefulness in the reduction system, thereby greatly reduce the SR of whole mass transfer system, turbulent flow that forms during together with the raising liquid velocity and vibration drop effect, to greatly improve the mass tranfer coefficient of gas-liquid mass transfer system, and then realize the purpose of raising system mass-transfer efficiency.This just directly causes the gas-liquid mixed time to shorten, thereby reduces significantly even can omit the aeration tank, and system's total energy consumption also will reduce.

It is as follows that the invention will be further described in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a liquid flowing type seawater method flue gas desulfurization technique schematic flow sheet of the present invention.

Fig. 2 is existing aeration type desulfuration of flue gas by sea water process flow diagram.

Fig. 3 is the schematic diagram that directly quickens acid seawater with power set.

Fig. 4 is with the schematic diagram of the direct acceleration of power set with the water of acid sea water mixing.

Fig. 5 is that power set connect schematic diagram with the seawater discharge-channel.

Fig. 6 is that power set connect schematic diagram with the seawater buffer unit.

Fig. 7 is that power set connect schematic diagram with the next stage power set.

Fig. 8, Fig. 9 are that the protrusion of power set is scopiform or blade shaped or profile of tooth and is installed on the interior schematic diagram of liquid level.

Figure 10, Figure 11 are that the protrusion of power set is spirality or blade shaped or profile of tooth and is installed on schematic diagram in the liquid.

Label shown in the figure and corresponding name are called: 1, fume extractor; 2, deduster; 3, air-introduced machine; 4, chimney; 5, flue washing device; 6, seawater extraction element; 7, acid seawater passage; 8, be used to mix the seawater passage of acid seawater; 9, seawater buffer unit; 10, air duct; 11, passing away; 12, power set; 12.1, liquid accelerator; 12.2, air sneaks into device; 12.3, air sneaks into the device liquid inlet; 12.4, air sneaks into the device air intake; 12.5, air sneaks into device gas-liquid mixture outlet; 12.6, the next stage power set; 13, air blast; 14, unit head; 15, protrusion.

In the liquid flowing type seawater method flue gas desulfurization technique flow chart shown in Figure 1, the extraction seawater flows into from big marine extraction or by the personal refrigerated sea water of industrial equipment as water pump by seawater extraction element 6 and realizes, the seawater that extracts is sent to the flue gas that washing in the flue washing device 5 is sent here through deduster 2 and air-introduced machine 3 from fume extractor 1, with washing SO wherein ₂Be washed SO ₂Clean flue gas enter atmosphere by chimney 4.Washed SO ₂After seawater owing to dissolved in SO ₂And be acid, water quality index such as its pH value must be returned to the degree that is consistent with the discharge standard of national regulation and just can enter natural environment, as the sea.For this reason, will absorb SO ₂Acid seawater send in the seawater buffer unit 9 through passage 7, its part is directly quickened by power set 12, and in this process entrained air; Air enters from air duct 10.The liquid that power set 12 directly quicken and inhaled air produce strong mixing and mass transport process, gas-liquid mixture sprayed fast again and with the pond in other liquid further mix, thereby make the seawater quality in the pond be able to rapid recovery.When seawater quality returns to the degree that meets environmental quality standards, be discharged into the nature marine site from seawater passing away 11.Power set can be installed by many serial or parallel connections.

Figure 2 shows that the process flow diagram of existing aeration type seawater method for desulfurizing fume, this process using is quickened air, the method for air blast in seawater with air blast 13.

Figure 3 shows that the method for directly quickening acid seawater with power set 12, liquid accelerator 12.1 in the power set is made of water pump, air is sneaked into device 12.2 and is made of ejector, sending into ejector after acid seawater in the seawater buffer unit 9 is quickened by water pump is the liquid inlet 12.3 that air is sneaked into device, the liquid that is accelerated forms injection stream and strong turbulent flow and produces negative pressure in ejector, thereby the gas access 12.4 that air is sneaked into device sucks air from air duct 10; Strong turbulent flow and the vibration that aggravation forms in the ejector that coexist of liquid jet and inhaled air one, after producing efficiently mass transport process and mixing, the gas-liquid mixture outlet 12.5 of sneaking into device from air sprays into the seawater buffer unit further and other sea water mixing.Also available air blast suitably increases air pressure to strengthen the air mixed volume to air duct.

Figure 4 shows that the seawater that directly quickens to be used to mix acid seawater with power set 12.The seawater that is used to mix acid seawater enters the inlet of liquid accelerator 12.1 through passage 8, quickened by power set 12 and entrained air after, enter seawater buffer unit and the acid sea water mixing that enters through acid seawater passage 7, acid seawater quality is recovered.

Power set 12 shown in Figure 5 connect with seawater passing away 11, and acid seawater is discharged through seawater passing away 11 behind acceleration and entrained air.

Power set 12 shown in Figure 6 connect with seawater buffer unit 9, and its liquid accelerator 12.1 is fetched water from seawater buffer unit 9, behind acceleration and the entrained air, still are discharged in the seawater buffer unit 9.

Figure 7 shows that the schematic diagram that connects of power set 12 and next stage power set 12.3.Power set 12 and next stage power set 12.3 coupled in series.The gas-liquid mixture that power set 12 are sent mixes with other liquid or gas once more through next stage power set 12.3, can further improve mass-transfer efficiency, reduces total energy consumption.

Fig. 8, power set shown in Figure 9 are made of the protrusion 15 that unit head 14 connects on the rotating shaft, and protrusion 15 is scopiform or blade shaped or profile of tooth; Protrusion is installed in the liquid level, is driven by unit head and quickens the turbulent flow that liquid forms fierceness when rotating at a high speed, thereby absorb the air of liquid level, produces the surface aeration effect.

Figure 10, power set shown in Figure 11, its protrusion is spirality or blade shaped or profile of tooth, and is installed in the liquid, quickens liquid during by the unit head driven rotary and forms turbulent flow, thereby produce negative pressuren zone simultaneously and suck air, realize the efficient mixing of gas and liquid by air duct 10.

Implement the required power set of the inventive method and can select equipment such as existing jet pump, mixed-flow pump, flow mixer and ultrasonic mixed flow device, surface aeration machine for use; Implement the required power set of the inventive method and be not limited to above device name of enumerating and type.

Liquid flowing type seawater method for desulfurizing fume disclosed by the invention and equipment, adopt power set directly to quicken liquid flow and entrained air, the quality recovery efficient of desulfurization seawater is improved, thereby have that the flue gas desulfurization process system floor space is little, effect that cost and operating cost further reduce, can be widely used in the exhaust gas desulfurization technology that the coastal industry facility disposes for control acid rain and sulfur dioxide pollution.

Claims

1, a kind of liquid flowing type seawater method for desulfurizing fume, it comprise extract seawater, with the seawer washing flue gas, seawater is mixed with air in order to recover acid seawater quality, reach the steps such as seawater that discharge meets the discharge standard; It is characterized in that, recover the step of acid seawater quality, is directly to quicken seawater with power set, and in this process entrained air.

2, method according to claim 1 is characterized in that, directly quickens seawater with power set, is directly to quicken acid seawater.

3, method according to claim 1 is characterized in that, directly quickens seawater with power set, is the seawater that directly quickens to be used to mix acid seawater.

4, method according to claim 1 is characterized in that, directly quickens seawater with power set, makes the seawater of acceleration form negative pressure or turbulent flow to suck air.

5, a kind of desulphurization plant that is applicable to the described method of claim 1, it comprises seawater extraction element, flue washing device, quality recovery device and discharger, it is characterized in that, in the quality recovery device power set are installed, these power set are to sneak into device by liquid accelerator and air to constitute.

6, desulphurization plant according to claim 5 is characterized in that, liquid accelerator is a water pump, and it is ejector that air is sneaked into device; The inlet of liquid accelerator and acid seawater, or with the seawater UNICOM that is used to mix acid seawater; The outlet of liquid accelerator connects with the liquid inlet that air is sneaked into device; The air intake that air is sneaked into device connects with air duct; Air is sneaked into utensil the gas-liquid mixture outlet.

7, desulphurization plant according to claim 5 is characterized in that, it is to be made of unit head and protrusion with rotating shaft that liquid accelerator and air are sneaked into device, and this protrusion is installed in the liquid level or in the liquid.

8, desulphurization plant according to claim 7 is characterized in that, described protrusion can be scopiform or blade shaped or profile of tooth or spirality.