CN201006388Y

CN201006388Y - Flue gas purifying tempering device for vaporizing liquid indirectly by using smoke gas residual heat

Info

Publication number: CN201006388Y
Application number: CNU2006201663629U
Authority: CN
Inventors: 陶国龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-12-31
Filing date: 2006-12-31
Publication date: 2008-01-16
Anticipated expiration: 2016-12-31

Abstract

The utility model discloses a smoke purification quality adjuster which uses smoke left heat to evaporate liquid, comprising an indirect evaporator which inlet and outlet of heat source channel are respectively connected with a smoke inlet tube and a smoke outlet tube, a steam outlet of the direct evaporator is connected with the inlet of a vacuum pump which outlet is connected with the inlet of a gas-liquid separator, the gas outlet of the gas-liquid separator is connected with the smoke outlet tube or the smoke inlet tube. The utility model can utilize the smoke left heat to generate steam, to be fed into the smoke tubes on the inlet or outlet tube of the indirect evaporator, to reduce the temperature of smoke and feed stem to humidify, thereby adjusting quality, particularly to improve the effect of high-resistance smoke electric de-dust device and control the discharge of micro particles, with low cost.

Description

Utilize the gas cleaning modifying device of fume afterheat indirect evaporation liquid

Technical field

The utility model relates to a kind of gas cleaning modifying device, is that a kind of fume afterheat indirect evaporation liquid that will utilize produces steam and the modified device that combines of purification specifically, reaches the environmental protection and the energy-conservation resultant effect of flue gas conditioning and UTILIZATION OF VESIDUAL HEAT IN.

Background technology

Along with the strictness day by day of environmental emission standard, to the flue dust and the SO of coal-burning boiler burning back flue gas ₂Emission limit has proposed more and more stricter requirement.In order to reduce coal-fired SO ₂Discharging, increasing coal-burning boiler has adopted and has changed the burning low-sulfur coal, or adopts the burning in circulating fluid bed boiler technology to implement to remove SO in the stove internal combustion ₂/ SO ₃Measure.But along with using low-sulfur coal, or the employing of burning in circulating fluid bed boiler technology, the SO in the ash-laden gas ₂/ SO ₃Be greatly reduced, also occur its flue dust inevitably again and present high specific resistance, make that cottrell is difficult to handle, original cottrell outlet smoke dust discharge concentration obviously increases, even the situation that discharging exceeds standard occurs.In order to improve the arresting efficiency of electric dust arrester installation to the high specific resistance flue dust, flue gas is carried out modifier treatment, make flue dust drop to cottrell easy to handle scope than resistance, be one of measure of handling the high specific resistance flue dust.And flue gas is implemented cooling or humidification is the common method of modifier treatment: a kind of is to spray into a certain amount of water vapour to mix with flue gas in flue gas, to increase the humidity of flue gas, but this method need consume big energy to produce water vapour, has increased operating cost; Another kind method is to the flue gas processing of lowering the temperature, and utilize cooling medium to absorb and take away the heat of flue gas, but can consume a large amount of cooling mediums, and need to build circulation, so operating cost and investment is also than higher; The third method is directly liquid to be sprayed into cooling tower or sufficiently long flue in vaporific mode, drop directly contacts with flue gas, utilize the heat of flue gas to make the liquid evaporation, thereby play flue gas had not only been lowered the temperature but also the modified effect of humidification, but this method power consumption is big, automatic control requires very high, device is complicated, simultaneously because the evaporation of the wearing and tearing of atomizer and drop is insufficient, make the flue gas with water operation, cause very big potential safety hazard for follow-up cottrell or equipment such as bag filter, air-introduced machine, the operating cost height, it is big to implement difficulty.

The utility model content

The problem that the cottrell dust concentration of emission that causes owing to the flue dust high specific resistance at present coal-burning boiler increases, the purpose of this utility model is to provide a kind of novel gas cleaning modifying device that utilizes fume afterheat indirect evaporation liquid, reach the modified effect that reduces flue-gas temperature simultaneously and increase smoke moisture, and can be used for work condition environment flue-gas temperature utilization to 80 ℃ left and right sides lower temperature.

The utility model adopts following technical scheme: a kind of gas cleaning modifying device that utilizes fume afterheat indirect evaporation liquid, it is characterized in that: comprise the indirect evaporation device, the entrance and exit that is used to flow through the passage of thermal source on the indirect evaporation device is connected with smoke-intake pipe and pipe respectively, the steam (vapor) outlet of described indirect evaporation device connects the inlet of vavuum pump, the inlet of described vacuum delivery side of pump and vapour liquid separator links, and outlet of the gas of vapour liquid separator and described pipe or the smoke-intake pipe UNICOM that is connected on outlet of indirect evaporation device or the inlet.

Can also comprise a cottrell, the pipe that is connected on the inlet of cottrell and the described indirect evaporation device links.

Can also comprise a bag filter, the pipe that is connected on the inlet of bag filter and the described indirect evaporation device links.

Described indirect evaporation device, it is used to flow through the passage and the mutual seal isolation of container for evaporation of thermal source, heat-conduction component group wherein run through thermal source section and container for evaporation and with both formations relation of being tightly connected.

This gas cleaning modifying device that utilizes fume afterheat indirect evaporation liquid of the present utility model, utilize the latent heat of vaporization of water evaporation by the indirect evaporation device, absorb the heat that flows through indirect evaporation device thermal source section flue gas by the heat-conduction component group that runs through container for evaporation and thermal source section, and because water is to vaporize under the degree of depth subnormal ambient that vavuum pump causes in the container for evaporation of indirect evaporation device, vapourizing temperature is low, can make the flue-gas temperature utilization to lower temperature, reach the modified effect of good cooling; The saturated vapor that produces owing to low-temperature vaporization is extracted out by vavuum pump simultaneously, and the saturated vapor after vapor-liquid separation sprays into or sucked in the flue gas before the dust-precipitator by the negative pressure swabbing action of flue gas self, produced the modified effect of steam humidifying again, not only realized lowering the temperature modified and the modified resultant effect of steam humidifying, and owing to adopt vavuum pump that the water in the indirect evaporation device container for evaporation is vaporized at low temperatures, to greatest extent fume afterheat is carried out effective utilization and produced more steam, thereby it is lower that flue-gas temperature is reduced to, strengthened modified effect, and both need not to consume the required extra heat energy of generation steam, do not need to build the circulation that the cooling medium of cooled flue gas is used yet, and cooling tower system, make device simple, safe and reliable, operating cost is lower.Can be used for if the flue gas acid dew point temperature allows, then can making its temperature reduce to 70～80 ℃ with below the flue-gas temperature utilization to 100 ℃.Through lower the temperature and the comprehensive modifier treatment of humidification after, flue dust can reduce by 2～3 orders of magnitude than resistance, and the physical property of ash-laden gas is more suitable for the processing of gathering dust of cottrell and bag filter, thereby raising dust-collecting efficiency, minimizing is to the soot emissions of atmosphere, realize qualified discharge, not only energy-conservation but also environmental protection.

Description of drawings

Fig. 1 is the basic embodiment schematic diagram that utilizes the gas cleaning modifying device of fume afterheat indirect evaporation liquid of the present utility model.

Fig. 2 is the another kind of embodiment schematic diagram that utilizes the gas cleaning modifying device of fume afterheat indirect evaporation liquid of the present utility model.

The specific embodiment

Below in conjunction with the drawings and specific embodiments the gas cleaning modifying device of fume afterheat indirect evaporation liquid that utilizes of the present utility model is described further.

As depicted in figs. 1 and 2, utilize the gas cleaning modifying device of fume afterheat indirect evaporation liquid to comprise an indirect evaporation device 1, the inlet and the outlet that are used to feed the passage of thermal source (being flue gas) in the thermal source section of indirect evaporation device 1 are connected with smoke-intake pipe and pipe 5 respectively.The steam (vapor) outlet 13 of indirect evaporation device connects the inlet of vavuum pump 3, the outlet of vavuum pump 3 connects the inlet of vapour liquid separator 4, and pipe 5 UNICOMs that the gas of vapour liquid separator outlet and the outlet 14 of indirect evaporation device 1 are as shown in Figure 1 joined, or with the smoke-intake pipe UNICOM that the inlet 11 of as shown in Figure 2 indirect evaporation device 1 joins, mix with flue gas so that steam is fed in the flue.

When the thermal source inlet 11 of flue gas by indirect evaporation device 1 flowed through the thermal source section of indirect evaporation device, release heat also makes self temperature reduction, heat transfer element in the indirect evaporation device for example is the heat pipe (not shown), make it under negative-pressure operation pressure, absorb heat and vaporization in the water in the heat transferred container for evaporation, saturated vapor is pumped out by vavuum pump 3 and the steam after vapour liquid separator separates is sent into or by in the swabbing action of the flue gas negative pressure suction flue gas, realize that cooling and steam humidifying are modified.By water supplement port 12 in the container for evaporation of the evaporator section of indirect evaporation device 1 moisturizing to keep the liquid level in the container for evaporation.Owing to adopt vavuum pump to make that the pressure for vaporization of the interior water of container for evaporation is a negative pressure, make vapourizing temperature can be lower than 100 ℃, press the suction capactity of the ripe vavuum pump of existing commercial Application level, can reach 50-60 ℃ of scope (suction capactity that specifically depends on vavuum pump) fully, but the flue-gas temperature after will guaranteeing in actual applications to lower the temperature be higher than 3 ℃ of flue gas acid dew points and more than, for the flue gas behind the desulfuration in furnace that changes burning low-sulfur coal and employing CFBB technology, because SO _XConcentration is very low, corresponding flue gas acid dew point temperature is also lower, therefore flue-gas temperature can be reduced to about 80 ℃ according to the actual acid dew point of flue gas, can make full use of the more waste heat of flue gas and produce required steam, not only improved comprehensive modified effect, and reduced operating cost, the air-introduced machine power consumption that resistance increased that its power consumption is essentially that the energy consumption of vavuum pump and flue gas flow through indirect evaporation device thermal source section passage and produces during with wherein heat-conduction component group heat exchange.

As shown in Figure 1, the pipe 5 that connects in indirect evaporation device 1 outlet 14 can also be connected on the inlet 15 of a cottrell 2, combine, improve electric dust collection effect by cooling and steam humidifying are modified with the electricity mode of gathering dust.Certainly, embodiment shown in Figure 2 can connect a cottrell equally.

Except that can be with the electricity mode of gathering dust is used in combination, can also combine with other dedusting methods such as bag filter, this is because cooling can make flue gas operating mode flow reduce after modified, thereby the filtration velocity of filter bag is reduced, flue gas behind the humidification is easy to form filter cake on the filter bag surface simultaneously, these factors all help filter bag gathers dust, and owing to the humidification to flue gas, also can produce SO to a certain extent _XAdditional effect Deng the gaseous contaminant removal.

The embodiment of Fig. 2 can utilize flue gas the thermal source passage of the indirect evaporation device 1 of flowing through and and the disturbance when carrying out heat exchange of wherein heat-conduction component produce collision effect between the soot dust granule, strengthen behind the humidification in the flue gas soot dust granule thing particularly the collision coalescence of fine particle increase effect, help more that gathering dust of follow-up cottrell or bag filter handled and to the emission control of fine particle.

Though evaporimeter also can adopt other forms of evaporimeter, but because the low temperature dewing corrosion problem that the acid composition in the flue gas causes is difficult to overcome, adopt indirect evaporation device described in the utility model then owing to be by heat transfer element indirect heat transfers such as heat pipes between thermal source section and the container for evaporation, therefore the thermograde at flue gas and thermal source section heat transfer element interface is not big especially, therefore being difficult for dewfall causes cold end corrosion, even and heat transfer element one side is not because wearing and tearing or corrosion can cause flue gas to the container for evaporation internal leakage yet, thereby improved whole device and comprised vavuum pump, the whole service life of vapour liquid separator etc. and the security of system, and prolonged the cycle of operation.

In the container for evaporation of indirect evaporation device evaporator section described in the utility model or on the pipeline that supplies water to container for evaporation, can also install and prevent or alleviate the device that incrustation scale produces or take corresponding measure.

Claims

1. gas cleaning modifying device that utilizes fume afterheat indirect evaporation liquid, it is characterized in that: comprise the indirect evaporation device, the entrance and exit that is used to flow through the passage of thermal source on the indirect evaporation device is connected with smoke-intake pipe and pipe respectively, the steam (vapor) outlet of described indirect evaporation device connects the inlet of vavuum pump, the inlet of described vacuum delivery side of pump and vapour liquid separator links, and outlet of the gas of vapour liquid separator and described pipe or the smoke-intake pipe UNICOM that is connected on outlet of indirect evaporation device or the inlet.

2. the gas cleaning modifying device that utilizes fume afterheat indirect evaporation liquid as claimed in claim 1 is characterized in that: also comprise a cottrell, the pipe that is connected on the inlet of cottrell and the described indirect evaporation device links.

3. the gas cleaning modifying device that utilizes fume afterheat indirect evaporation liquid as claimed in claim 1 is characterized in that: also comprise a bag filter, the pipe that is connected on the inlet of bag filter and the described indirect evaporation device links.