CN113623680A - Biomass fuel preheating evaporation dryer and method - Google Patents

Abstract

The utility model provides a biomass fuel preheating evaporation dryer and a method, comprising a heating water path, wherein the heating water path comprises a smoke cooler, a preheating pump and a coil heater which are sequentially communicated, one end of the coil heater is communicated with the smoke cooler to form a closed loop, the coil heater is arranged outside equipment to be dried, and the smoke cooler is arranged in a flue at the tail part of a boiler; the efficiency of the boiler is improved, the moisture in the fuel is removed, and the heat loss caused by evaporative emission of the moisture in the fuel is reduced; the temperature of the hearth is improved; the uniformity of the fuel is improved, and the load control and the peak and valley regulation are facilitated; the heating area of the hearth is reduced, and materials are saved; a higher temperature heating surface can be further arranged to improve the efficiency of the unit; the tail flue of a dust remover, desulfurization and the like is prevented from being blocked, the ash conveying system is prevented from being blocked, the moisture in the discharged smoke is reduced, the dew point temperature of the discharged smoke is reduced, and the bonding of fly ash is prevented.

Description

Biomass fuel preheating evaporation dryer and method

Technical Field

The disclosure relates to the field of drying equipment, and particularly discloses a biomass fuel preheating evaporation dryer and a method.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

Energy and environmental issues have become central issues facing the world today with respect to national sustainability since the 21 st century. With the improvement of the living standard of the world population and people, the consumption of various non-renewable energy sources is increased day by day, and the energy crisis is serious day by day. On the other hand, due to the combustion of a large amount of fossil fuels, a series of environmental problems such as acid rain, greenhouse effect and the like are caused, and great harm is brought to the natural environment and human life. To alleviate and gradually solve the above problems, renewable energy is actively developed in all countries of the world.

The biomass energy is increasingly concerned by countries in the world as a green and environment-friendly renewable resource, but the large-scale industrial application of biomass still faces huge challenges. At present, biomass fuel is mainly utilized by three modes of solid fuel solidification and forming, thermochemistry utilization, biochemical conversion and the like, and various utilization methods have problems of one aspect or multiple aspects such as high production cost, small economic radius or low calorific value after conversion.

The direct combustion method in thermochemical utilization is a method of directly combusting biomass fuel to obtain electric energy or high-temperature high-pressure steam with certain quality for utilization. Because biomass fuel has an optimal collection radius and heating load and industrial steam also have an optimal steam supply radius, the coupling utilization of the biomass fuel and the industrial steam is popularized in recent years. However, the existing biomass fuel burning boiler equipment has the problems of low-temperature corrosion, low homogenization degree, low boiler efficiency and the like, and the main reason of the problems is that the moisture content of the biomass fuel is high, so that the reasonable and economic extraction of the moisture in the biomass fuel is a big problem faced by the existing biomass fuel burning equipment.

Disclosure of Invention

In order to solve the above problems, the present disclosure provides a biomass fuel preheating evaporation dryer and a method.

In a first aspect, the present disclosure provides a biomass fuel preheats evaporation dryer, including the heating water route, the heating water route is including the cold ware of cigarette, preheat pump and the coil heater that communicate in proper order, coil heater's one end and the cold ware intercommunication of cigarette form the closed loop, coil heater sets up in treating the drying equipment outside, the cold ware setting of cigarette is in boiler afterbody flue.

In a second aspect, the present disclosure provides a method of using a biomass fuel preheat evaporative dryer, comprising:

heating feed water in a smoke cooler through smoke at the tail part of a boiler, conveying the feed water into a coil heater through a preheating pump, heating equipment to be dried through the coil heater, and keeping the temperature at a set temperature;

and (3) cooling the gas generated after heating in the equipment to be dried through a drying gas path, and then discharging or feeding the gas into a boiler for combustion supporting.

Compared with the prior art, this disclosure possesses following beneficial effect:

1. this is disclosed to be adopted through heating water route and dry gas circuit mating reaction, heats the feedwater in the cold ware of cigarette through boiler afterbody flue gas heating in the heating water route, and the feedwater is carried to the coil heater in through preheating the pump, treats drying equipment through the coil heater and heats to keep at the settlement temperature, improve boiler efficiency, detach the moisture in the fuel, reduce because moisture evaporation discharges and arouse the heat loss in the fuel.

2. The drying gas circuit is arranged, and comprises a fastener, a condenser and a discharge pipeline which are sequentially communicated; the fastener is communicated with the interior of the equipment to be dried through a gas path, the exhaust pipeline comprises an exhaust pipe, one end of the exhaust pipe is communicated with the external atmosphere and/or is communicated with an ejector, the ejector is communicated with the boiler through an air supply pipeline, gas flows into the boiler for supporting combustion, the temperature of a hearth is improved, moisture entering the boiler is reduced, heat absorbed by the moisture is reduced, and the temperature of the hearth is improved; in order to prevent overhigh negative pressure from being formed in the feeding system, a pressure regulating valve is arranged in the exhaust pipe, and the exhaust pipe can be automatically opened when the pressure is overlow so as to prevent backfire; the uniformity of the fuel is improved, the load control and the peak and valley regulation are facilitated, the heating area of the hearth is reduced, and the material is saved; the heating surface with higher temperature can be further arranged to improve the efficiency of the unit.

3. The drying gas circuit comprises a fastener, a condenser and a discharge pipeline which are sequentially communicated through the pipelines, wherein the medium in the condenser pipe is steam turbine condensed water, the condensed water cools water vapor and then flows into a water cooling jacket, the cooled water cooling jacket returns to a steam turbine room, and the water condensed by the water vapor is discharged through a drain pipe, so that low-temperature corrosion is reduced. Reduce moisture in the exhaust smoke, prevent the combination of components such as SO2 and the like and the moisture, and reduce low-temperature corrosion.

4. This is openly through addding balance pipe, blowoff valve and moisturizing pipeline, can effectively improve drying equipment stability, can prevent simultaneously that afterbody flues such as dust remover, desulfurization from blockking up, prevents that ash conveying system from blockking up, reduces moisture in discharging fume, reduces the dew point temperature of discharging fume, prevents that the flying dust from bonding.

Advantages of additional aspects of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

FIG. 1 is a general block diagram of a biomass fuel preheat evaporative dryer of the present disclosure;

the system comprises a smoke cooler 1, a boiler 2, an air supply pipeline 3, an ejector 4, an exhaust pipe 5, a drain pipe 6, a condenser 7, a pressure regulating valve 8, a locking device 9, a balance pipe 10, a storage bin 11, a screw feeder 12, a coil heater 13, a water cooling jacket 14, a recirculation pipeline 15, a preheating pump 16, a water replenishing tank 17, a water replenishing valve 18, a safety valve 19 and a blow-down valve 20.

The specific implementation mode is as follows:

the present disclosure is further described with reference to the following drawings and examples.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Example 1

As shown in fig. 1, a biomass fuel preheating evaporation dryer comprises a heating water path and a drying gas path;

the heating water path comprises a smoke cooler, a preheating pump and a coil heater which are sequentially communicated through a pipeline, one end of the coil heater is communicated with the smoke cooler to form a closed loop, the coil heater is arranged on the outer side of the equipment to be dried, and the smoke cooler is arranged in a flue at the tail of the boiler; the coil heater is used for heating the fuel to keep the temperature of the fuel within 50-220 ℃, removing moisture in the fuel, and feeding water to the smoke cooler after passing through the coil.

The drying gas path comprises a fastener, a condenser and a discharge pipeline which are sequentially communicated through pipelines, the discharge pipeline comprises a steam exhaust pipe, one end of the steam exhaust pipe is communicated with the ejector, and gas flows into the boiler for combustion supporting through the ejector; the locking device is communicated with the interior of the equipment to be dried through a gas path; specifically, the discharge pipeline comprises a drain pipe and an exhaust pipe, and a pressure regulating valve is arranged in the exhaust pipe; the water condensed by the water vapor is discharged through a drain pipe; the exhaust pipe is communicated with the external atmosphere and/or communicated with an ejector 6 in the air supply pipeline 3; if the exhaust pipe is communicated with the ejector, the ejector is communicated with the boiler through the air supply pipeline, and the residual air flowing out due to thermal expansion and uncondensed steam flow into the boiler through the air supply pipeline for supporting combustion; in order to prevent the feed system from forming overhigh negative pressure, a pressure regulating valve (8) is arranged in the exhaust pipe, and the exhaust pipe can be automatically opened when the pressure is too low to prevent backfire.

Further, the equipment to be dried comprises a screw feeder, a blanking pipe and a storage bin, wherein the coil heater (13) is positioned outside the screw feeder (12), the blanking pipe and the storage bin (11); the coil heater is used for heating the fuel in the screw feeder (12), the blanking pipe and the storage bin (11) to ensure that the fuel is kept at 50-220 ℃, removing moisture in the fuel, and feeding water to the smoke cooler after passing through the coil.

Further, the fastener is communicated with the equipment to be dried through a pressure regulating valve;

furthermore, the medium in the condenser pipe is steam turbine condensed water, the steam turbine condensed water cools the steam and then flows into the water cooling jacket, and the steam turbine condensed water flowing into the water cooling jacket cools the water cooling jacket and then returns to the steam turbine room.

The water supply pipeline comprises a water supply tank, a water supply valve and a safety valve, wherein the water supply valve and the safety valve are connected with the water supply tank; one end of the water replenishing tank is communicated with the heating waterway, the communication position is arranged between coil heaters of the preheating pump, the water replenishing tank is connected with a water replenishing valve, the water replenishing valve is communicated with an external water source to replenish the external water source into the water replenishing tank, the water replenishing tank is connected with a safety valve, and the safety valve is used for avoiding overpressure of the pipeline and also avoiding backflow of the heating waterway to the water replenishing pipeline;

the device further comprises a balance pipe, wherein one end of the balance pipe is communicated with the blanking pipe, and the other end of the balance pipe is connected with the fastener; the balance pipe is used for balancing the air pressure of the blanking pipe and the locking device, and the air in the locking device can flow into the blanking pipe through the balance pipe.

Further, still include the recirculation pipeline, be equipped with the valve on the recirculation pipeline, pipeline intercommunication between recirculation pipeline one end and the preheating pump and the coil pipe heater of heating pipeline, pipeline intercommunication between the other end and the coil pipe heater and the cigarette cold ware of heating pipeline.

Further, the device also comprises a blow-down valve, wherein the blow-down valve is arranged on a pipeline between the preheating pump and the smoke cooler of the heating pipeline.

Example 2

The present disclosure provides a use method of a biomass fuel preheating evaporation dryer, which includes:

heating feed water in a smoke cooler through smoke at the tail part of a boiler, conveying the feed water into a coil heater through a preheating pump, heating equipment to be dried through the coil heater, and keeping the temperature at a set temperature;

the gas generated after heating the equipment to be dried is cooled through a drying gas path and then discharged or enters a boiler for combustion supporting; concretely, the fuel is through the drying back, inside water and outer water evaporation, form the malleation, the end opening sets up fastener (9) of certain pressure, get into condenser (7) through drawing the wind channel, condenser pipe in the medium is the steam turbine condensate water, the water cooling steam of condensation flows into water-cooling jacket (14) after, return turbine computer lab behind the cooling water-cooling jacket, and the water that the vapor condenses is discharged through drain pipe (6), remaining air and the water vapor of noncondensation that flow out because of the thermal energy discharge flow through blast pipe (5) discharge to the atmosphere or flow into the boiler combustion-supporting through ejector (4) of installing in blast pipe (3), for preventing to form too high negative pressure in the feed system, be equipped with air-vent valve (8) in the blast pipe, can open automatically when pressure is low, prevent the tempering.

The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.

Claims (10)

1. The utility model provides a biomass fuel preheats evaporation dryer, its characterized in that, includes the heating water route, the heating water route is including the cold ware of cigarette, preheat pump and the coil heater that communicate in proper order, coil heater's one end and the cold ware intercommunication of cigarette form the closed loop, coil heater sets up in treating the drying equipment outside, the cold ware of cigarette sets up in boiler afterbody flue.

2. The biomass fuel preheating evaporation dryer of claim 1, further comprising a drying gas path, wherein the drying gas path comprises a fastener, a condenser and a discharge pipeline which are communicated in sequence; the fastener is communicated with the interior of the equipment to be dried through the air passage.

3. The biomass fuel preheating evaporation dryer as claimed in claim 2, wherein the exhaust pipeline comprises an exhaust pipe, one end of the exhaust pipe is communicated with the external atmosphere and/or communicated with an ejector, and the ejector is communicated with the boiler through an air supply pipeline to supply air to the boiler for combustion supporting.

4. The biomass fuel preheating evaporation dryer of claim 1, wherein the drain line further comprises a drain pipe through which water condensed from the water vapor is discharged and an exhaust pipe.

5. The biomass fuel preheating evaporation dryer of claim 1, wherein a pressure regulating valve is arranged in the exhaust pipe.

6. The biomass fuel preheating evaporation dryer of claim 1, further comprising a water replenishing pipeline, wherein the water replenishing pipeline comprises a water replenishing tank, and further comprises a water replenishing valve and a safety valve which are connected with the water replenishing tank, and the water replenishing tank is communicated with the heating water circuit.

7. The biomass fuel preheating evaporation dryer of claim 1, wherein the device to be dried comprises a screw feeder, a down pipe and a silo, and the coil heater is located outside the screw feeder, the down pipe and the silo.

8. The biomass fuel preheating evaporation dryer as claimed in claim 1, wherein the medium in the condenser pipe is steam turbine condensed water, the steam turbine condensed water cools the steam and then flows into the water cooling jacket, and the steam turbine condensed water flowing into the water cooling jacket cools the water cooling jacket and then returns to the steam turbine room.

9. The biomass fuel preheating evaporation dryer of claim 1, wherein the coil heater is used for keeping the fuel at 50-220 ℃, removing water in the fuel, and returning feed water to the smoke cooler after passing through the coil heater.

10. The use method of the biomass fuel preheating evaporation dryer is characterized by comprising the following steps:

heating feed water in a smoke cooler through smoke at the tail part of a boiler, conveying the feed water into a coil heater through a preheating pump, heating equipment to be dried through the coil heater, and keeping the temperature at a set temperature;

and (3) cooling the gas generated after heating in the equipment to be dried through a drying gas path, and then discharging or feeding the gas into a boiler for combustion supporting.

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