WO2019034141A1

WO2019034141A1 - Upgraded spray-type multi-level flue gas purification device

Info

Publication number: WO2019034141A1
Application number: PCT/CN2018/101018
Authority: WO
Inventors: 郝均国
Original assignee: 郝均国
Priority date: 2017-08-18
Filing date: 2018-08-17
Publication date: 2019-02-21
Also published as: CN207102246U

Abstract

A spray-type multi-level flue gas purification device comprises a high-temperature spray purification tower (1), a low-temperature spray purification tower (2, 3), a cyclone-type dewatering and dust-removal device (4, 42) and a bag-type dust removal device (5) that are sequentially connected by means of pipelines. The lower part of the low-temperature spray purification tower (2) is connected a settling pond (15). The settling pond (15) is in communication with a liquid storage tank (14). The liquid storage tank (14) is in communication with an upper end of a current-convection spray-type cooling tower (13) by means of a liquid loading pipe, and the lower part of the current-convection spray-type cooling tower (13) is in communication with the upper end of the low-temperature spray purification tower (2). A gas discharge pipe of the current-convection spray-type cooling tower (13) can be in communication with a spray-type heat exchange tower (44).

Description

Spray type multi-stage flue gas purification device upgrade type

Technical field

The invention relates to a high-temperature flue gas purification device, in particular to an upgrade type of a spray multi-stage flue gas purification device.

Background technique

The flue gas emitted from industrial equipment such as boilers contains a large amount of toxic gases and pollutants such as fine dust, sulfur dioxide, nitrogen oxides or carbon black. Direct discharge will seriously pollute the atmospheric environment. Therefore, it is necessary to treat the exhausted flue gas before passing it. The fan is led out through the chimney to the upper atmosphere.

The existing flue gas purification device usually uses the liquid sprayed from the top in the purification tower to convect and contact the high-temperature flue gas which is introduced therein, thereby adsorbing the harmful gas in the high-temperature flue gas and causing the fine dust to settle. To achieve the purpose of purifying smoke.

Because the composition of the boiler flue gas is quite complicated, some components are more likely to be adsorbed and settled at high temperatures, while some components are more easily adsorbed and settled at low temperatures; in addition, the purifying agent added in the spray liquid is different, and different purification The temperature required for the agent is also different. Therefore, spraying only the high temperature flue gas with a single temperature cannot completely remove the harmful components in the flue gas, resulting in incomplete treatment and poor purification effect.

Moreover, the temperature of the single purification tower which is usually used after one or two spray cycles is increased, and when it is used in the gas purification process, the diffusion of the hot volatile gas cannot be effectively suppressed, so that the gas purification is not complete, and the The desired purification effect is achieved while also increasing the amount of steam emitted by the purification tower. Especially in late autumn and winter, the poor purification effect and the increase in steam volume directly aggravate the haze problem and seriously affect the environmental quality. Therefore, it is urgent to develop a flue gas purification equipment with excellent performance.

Summary of the invention

The object of the present invention is to provide an upgrade type of a spray type multi-stage flue gas purification device, so as to solve the problem that the existing flue gas purification device has poor purification effect and large steam discharge amount.

The present invention is implemented as follows:

The invention only improves the depth of the spray cooling tower in the original spray multi-stage flue gas purification device, and the other remains unchanged, so that the cooling effect is improved by leaps and bounds, thereby better lowering the temperature of the existing high temperature flue gas. Emissions and thorough purification, at the same time, a number of historical breakthroughs in energy conservation and environmental protection, have been able to fly forward. On the basis of the original spray multi-stage flue gas purification device, the original four sides are transparent, which facilitates the high-temperature purification liquid spray cooling from the purification tower, and the spray cooling tower of the high-temperature purification liquid heat dissipation concept is improved as follows The basic principle of the airflow convection cooling tower is as follows:

In the airflow convection shower tower, the liquid is sprayed from top to bottom, and is in rapid convective contact with the airflow running fast from bottom to top under the action of the air guiding device. The fast upward airflow will bring the high temperature in the high temperature spray liquid. Under the action of the air guiding device, the air is led to the part requiring heat energy; the cleaning liquid sprayed from the top to the bottom falls naturally to the lower liquid storage tank of the airflow convection shower cooling tower, and the hydraulic pump passes through the upper liquid pipe. It is pumped again into the upper part of the spray-type purification tower associated with it, and is sprayed downward by the high-pressure nozzle... The recirculation operation of the purification liquid is repeated to achieve the heat exchange purpose.

The difference between the airflow in the airflow convection shower tower and the airflow in the shower tower is that since the former is for heat exchange, the airflow should be operated quickly, which is convenient for airflow convection. The effect of the shower cooling tower; the latter is for the purpose of purifying the flue gas, and should be operated at a moderate speed.

For the purpose of heat exchange of liquid, gas can be used as heat exchange medium; for heat exchange purposes of gas, liquid can be used as heat exchange medium, so that high temperature of liquid or gas can be converted into low temperature, or low temperature can be converted into high temperature heat exchange. purpose.

The setting of the spray airflow convection cooling tower (hereinafter referred to as the tower body) is as follows:

The flow of the liquid: the flow of the liquid (purification liquid) is unchanged. It is necessary to install a plurality of high-pressure nozzles connected to the upper liquid pipe in the airflow convection shower tower.

Gas flow: The air inlet pipe is arranged on the lower side wall of the tower body, one end of the air guiding pipe communicates with the upper part of the tower body, the other end leads to a required part of the heat energy, and an air guiding device is arranged on the air guiding pipe.

The invention successfully realizes the low-temperature discharge and thorough purification of the high-temperature flue gas, which is a gas heat exchange device which has the unique and powerful effect of converting the high-temperature flue gas into the low-temperature flue gas.

The hot gas flow of the tower body under the action of the air guiding device can be used as a heat exchange source of the heat exchange device.

The end of the air guiding duct is connected to the combustion air inlet of the boiler, and has the dual functions of blast assisting and energy saving, and the energy saving effect is more remarkable in the cold winter.

The set heights of the spray cleaning tower, the sedimentation tank and the liquid storage tank are sequentially lowered.

The spray heat exchange device is two or more seats connected through a connected pipeline.

The invention is more practical for purification treatment of ultra-high temperature flue gas in the field of iron and steel smelting.

Since the flue gas purification of the present invention is purified by high-temperature and low-temperature multi-stage spray, the harmful substances such as powder and fine particles in the flue gas are fully absorbed, expanded, precipitated, and then removed by the bag, which is superior to dust removal. Purification performance.

The invention is perfectly combined with the spray multi-stage flue gas purification device applied by the applicant, so that the flue gas purification effect reaches the ultimate optimal purification effect. The spray multi-stage flue gas purification device is composed of a plurality of national patent technologies. Jointly built.

The device can simultaneously complete the desulfurization, denitration, dust removal and other harmful substances removal process, and achieve low temperature discharge and thorough purification of high temperature flue gas.

The invention has several powerful technical advantages as follows:

1. According to relevant data, nearly 90% of foreign boiler exhaust gas purification adopts spray-type flue gas purification device, and spray-type flue gas purification device is especially popular in the United States, Japan and other countries, and has a trend of increasing year by year. However, due to the complex composition of the boiler flue gas, some components are suitable for high-temperature purification treatment, while some components are suitable for low-temperature purification treatment, and the temperature required for the purification agent added in the spray liquid is different, usually a single flue gas purification tower is adopted. Can not achieve the desired flue gas purification effect. Different from the single flue gas purification tower, the spray multi-stage flue gas purification device is upgraded to concentrate the flue gas to be treated in a relatively small purification tower for high-temperature and low-temperature multi-stage purification, and the corresponding flue gas components may be respectively added according to the flue gas components. The purifying agent is adjusted to a suitable purifying temperature, and the flue gas purifying effect is remarkably improved.

2. The invention provides a gas flow convection spray cooling tower on the spray multi-stage flue gas purification device, so that the temperature of the circulating spray liquid can be rapidly lowered, thereby ensuring that the high temperature flue gas can be fully absorbed in the purification tower. The harmful gas in the process, while playing the integrated purification of flue gas such as dust removal, desulfurization and denitrification, minimizes the diffusion of the hot volatile gas, makes the high temperature flue gas purification more thorough, greatly improves the purification effect, and significantly reduces the vapor. The emission, at the same time, also converts the hot volatile gas which is originally emitted into the atmosphere through the chimney and causes the climate to gradually warm up, and the heat in the spray liquid is recovered to obtain hot air. The hot air can be used for the blast support of the boiler. In the process, the full utilization of heat is realized, especially in the severe winter season, which has certain energy-saving effects.

3. The spray multi-stage flue gas purification device of the present invention is upgraded to achieve low-temperature discharge and thorough purification of high-temperature flue gas, which can greatly improve the flue gas purification effect, and the steam generated by the spray is excellent. Control, it has an epoch-making positive promotion effect on the control of smog weather, and can also play a positive role in suppressing climate warming, and plays an important role in comprehensive energy utilization and energy conservation and environmental protection; it can also promote the spray liquid. Cooling, better achieve low-temperature discharge of high-temperature flue gas, recover waste heat from flue gas and convert it into hot air to provide energy for other equipment in need. The invention has the advantages of simple structure, easy construction and implementation, no safety hazard, low cost, wide application range, and the use of the enterprise to ensure the smooth production, while saving a large amount of environmental protection costs, and economical.

DRAWINGS

1 is a schematic structural view of an upgraded spray type multi-stage flue gas purification device according to an embodiment of the present invention.

In the picture: 1, high temperature spray purification tower, 2, the first low temperature spray purification tower, 3, the second low temperature spray purification tower, 4, cyclone dewatering dust collector, 5, bag type dehumidifier, 6, the first An induced draft fan, 7, a first upper liquid pipe, 8, a first liquid storage tank, 9, a first sedimentation tank, 10, a first upper liquid pump, 11, a second induced draft fan, 12, a second upper liquid pump 13, gas convection spray cooling tower, 14, second liquid storage tank, 15, second sedimentation tank, 16, circulating pump, 17, third induced draft fan 18, low temperature tower induced draft fan, 19, airflow liquid storage Slot, 20, high-altitude vertical exhaust pipe, 21, high-pressure nozzle, 22 high-pressure nozzle, 23, high-pressure nozzle, 24, intake pipe, 25, air intake pipe, 26, pipeline, 27 air intake device, 28, air duct , 29, air intake device, 30, exhaust pipe, 31, liquid introduction pipe, 32, hydraulic pump, 33, liquid input pipe, 34, heat exchange nozzle, 35, liquid output pipe, 36, hydraulic pump, 37, row Liquid pipe, 38, intake pipe, 39, gas pipe, 40, gas pipe, 41, gas pipe, 42, second cyclone dewatering dust collector, 43, gas pipe, 44 heat exchange tower.

Detailed ways:

The invention is based on the spray multi-stage flue gas purification device previously applied by the applicant, and deepens and improves the spray cooling tower therein to form a powerful airflow convection shower cooling tower, thereby The overall purification performance has been greatly improved, and at the same time, it has the dual functions of energy saving and environmental protection, and the purification technology in the field of industrial flue gas purification has been rapidly developed.

The invention successfully realizes the low-temperature discharge and thorough purification of the high-temperature flue gas, and is itself a heat exchange device with unique and powerful high-temperature flue gas converted into a low-temperature gas, on the basis of which the high-temperature liquid can be designed to be converted into a low-temperature liquid and a low temperature. The liquid heat transfer device can be transformed into a heat exchange device for fluid solids (the input and output parts can be changed to the rotary vane drive mode in the pipe). On this basis, a heat exchange device for converting high temperature gas into low temperature gas can also be designed.

To achieve the above ideal heat exchange purpose, the airflow convection shower tower can be combined as needed, and the temperature of the heat exchange medium can be flexibly changed according to the needs of the heat exchange material: the heat exchange purpose for the liquid can be used as a gas exchange Heat medium; for the purpose of heat exchange of gas, liquid can be used as a heat exchange medium, thereby achieving high temperature conversion of liquid or gas to low temperature, or low temperature to high temperature heat exchange.

The specific gas-liquid process of the flue gas purification process of the present invention and the conversion of the cryogenic liquid for the purpose of liquid heating into a high-temperature liquid is as follows:

Gas flow in gas purification:

The high-temperature gas from the boiler enters the high-temperature spray purification tower 1 from the top to the bottom through the intake pipe 38 under the action of the air-inducing device 6, and enters the first low-temperature spray purification tower 2 from the bottom up by the action of the second induced draft fan 11. Under the action of the low temperature tower induced draft fan 18, the air flow of the first low temperature spray cleaning tower 2 is operated from bottom to top, and the second low temperature spray is driven from the top to the bottom by the air duct 39 under the action of the low temperature tower induced draft fan 18. The purification tower 3 enters the cyclone type dewatering dust collector 4 through the gas pipe 40 under the action of the third induced draft fan 17, and enters the second cyclone dewatering dust collector 42 through the gas supply pipe 41, enters the bag type decontamination 5 through the gas pipe 43 and enters the high altitude vertical type. The lower portion of the exhaust duct causes the airflow to be exhausted from the bottom to the top in the high-altitude vertical exhaust duct 20.

The process of purifying liquid in gas purification:

The purification liquid circulation process of the high-temperature spray purification tower: under the action of the first upper liquid pump 10, the purification liquid in the first liquid storage tank 8 is pumped into the upper end of the high-temperature spray purification tower 1 through the first upper liquid pipe 7, through The high-pressure nozzle 21 communicating with the first upper liquid pipe 7 is sprayed from the top to the bottom, and the spray liquid falls into the lower part of the high-temperature spray cleaning tower, and is discharged from the top to the bottom of the high-temperature spray cleaning tower through the pipeline into the first sedimentation tank 9 through the pipeline. The lower discharge into the first liquid storage tank 8 circulates the purification liquid.

The circulation process of the first low temperature spray purification tower purification liquid: under the action of the second upper liquid pump 12, the purification liquid in the lower liquid storage tank of the air flow convection type cooling tower 13 is pumped into the first low temperature spray through the upper liquid pipe The leaching purification tower 2 is sprayed from the top to the bottom by the high pressure nozzle 22 connected to the upper liquid pipe, and the spray liquid falling into the lower part of the first low temperature spray cleaning tower 2 is discharged into the second sedimentation tank 15 from the top to the bottom through the pipeline. The second liquid storage tank 14 is discharged from the top to the bottom through the pipeline. Under the action of the circulation pump 16, the purified liquid is pumped into the upper part of the airflow convection type cooling tower 13 through the pipeline, and the high pressure nozzle connected to the upper liquid pipeline is self-controlled. Spraying up and down, the spray liquid falls into the lower part of the airflow convection type cooling tower, and is pumped into the first low temperature spray cleaning tower 2 through the second upper liquid pump for recycling.

The purge liquid circulation process of the second low temperature spray purification tower 3 is referred to the first low temperature spray purification tower 2.

In the drawing, the waste heat of the flue gas discharged from the exhaust pipe 26 of the airflow convection shower tower 13 is used as a gas-liquid process for converting the low-temperature liquid into a high-temperature liquid.

The operation flow of the heat medium gas: the hot gas flow from the airflow convection shower tower 13 enters the lower portion of the heat exchange tower 44 through the air duct 27 through the air duct 27, and the air flow in the heat exchange tower 44 under the action of the air guiding device 29. The rapid operation from bottom to top is discharged from the exhaust pipe 30 through the draft duct 28.

The liquid flow of the low temperature liquid into the high temperature liquid: the liquid to be exchanged by the hydraulic pump 32 from the liquid introduction pipe 31 from the liquid input pipe 33 into the upper portion of the heat exchange tower 44 via the high pressure nozzle 34 communicating with the liquid input pipe 33 Spraying from top to bottom, the spray liquid falls into the lower portion of the heat exchange tower 44 and is led by the hydraulic pump 36 from the liquid output pipe 35 to the desired portion via the drain pipe 37.

Claims

The utility model relates to an upgrade type of a spray type multi-stage flue gas purification device, which is characterized in that: a high-temperature spray purification tower connected by pipelines in sequence, a low-temperature spray purification tower, a cyclone type dewatering dust collector, a bag type sinking; The liquid discharge port at the lower side wall of the leaching purification tower is connected to the liquid inlet of the sedimentation tank through the liquid discharge pipe; the liquid discharge port of the sedimentation tank is connected to the liquid inlet of the liquid storage tank through the liquid discharge pipe; the liquid storage tank The liquid discharge port is connected to the upper liquid port of the airflow convection spray cooling tower through the upper liquid pipe, and a circulation pump is arranged on the upper liquid pipe;

An air inlet duct is disposed on a lower sidewall of the airflow convection shower tower, an air duct is disposed at a top of the airflow convection shower tower, and an air guiding device is disposed on the air duct. The airflow convection shower tower has a plurality of cooling nozzles inside; the upper inlet of the airflow convection shower tower is connected to the liquid discharge port of the liquid storage tank through a pipeline, and the upper liquid pipeline is provided on the upper liquid pipeline. An upper liquid pump, wherein the liquid inlet pipe communicates with the cooling spray head through a second spray pipe, and passes through a liquid discharge pipe at a lower portion of the gas flow convection spray cooling tower and an upper liquid inlet of the low temperature spray purification tower The liquid pipe is connected to the upper liquid pipe, and the upper liquid pipe is connected to the first spray pipe; the lower side wall of the airflow convection shower cooling tower is connected The intake pipe, the top of the airflow convection shower tower is connected with the exhaust pipe, and the exhaust pipe is provided with an induced draft fan, and the hot air flow is discharged to the desired part through the exhaust pipe.
The upgrade type of the spray type multi-stage flue gas purification device according to claim 1, wherein the invention realizes low-temperature discharge of high-temperature flue gas, and is itself a heat exchange device with high performance and powerful high-temperature gas converted into low-temperature gas. The core technical feature is that in the airflow convection shower cooling tower, the liquid is sprayed from top to bottom, and is in convective contact with the airflow running from the bottom up under the action of the air guiding device, thereby achieving the heat exchange purpose. For the purpose of heat exchange of liquid, gas can be used as heat exchange medium; for heat exchange purposes of gas, liquid can be used as heat exchange medium, so that high temperature of liquid or gas can be converted into low temperature, or low temperature can be converted into high temperature heat exchange. purpose.
The upgrade type of the spray type multi-stage flue gas purification device according to claim 1, wherein the end of the air guiding duct is connected to a combustion air vent of the boiler.
The upgrade of the spray type multi-stage flue gas purification device according to claim 1, wherein the set heights of the spray cleaning tower, the sedimentation tank and the liquid storage tank are sequentially lowered.
The upgrade type of the spray type multi-stage flue gas purification device according to claim 1, wherein the end of the air guiding duct is connected to the intake pipe of the heat exchange device.
The upgrade type of the spray type multi-stage flue gas purification device according to claim 1 or 5, wherein the heat exchange device is two or more seats in series.