Low-energy-consumption biomass drying device

Abstract

The utility model discloses a low-energy-consumption biomass drying device. The low-energy-consumption biomass drying device comprises an efficient air pre-heater, a rotary roller dryer, a cyclone separator and a water film dust remover, the efficient air pre-heater is provided with a flue gas inlet used for introducing flue gas so as to heat air, and the heated air is conveyed to the rotary roller dryer; and after the biomass wet fuel enters the rotary roller dryer, moisture in the biomass fuel is taken away by hot air to form dry fuel, and the dry fuel is discharged from the dry fuel outlet. Air is heated by recovering flue gas waste heat, compared with flue gas, dried air has the advantages of being low in moisture content and large in drying and moisture carrying capacity, moisture of biomass fuel can be better taken away, the moisture content of the biomass fuel is reduced, the combustion energy efficiency of the biomass fuel is improved, the combustion efficiency is improved, and the carbon-saving characteristic of biomass energy is fully exerted.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of biomass pretreatment, and particularly relates to a low-energy-consumption biomass drying device. BACKGROUND

[0002] Industrial production is one of the main sources of carbon emissions, and promoting green and low-carbon development in the industrial field plays an important role in achieving the national carbon peak. As the main power energy in China, thermal power accounts for more than 50% of the total installed capacity of power generation in the country, and the industry has huge carbon reduction pressure. China has the world's largest clean coal power supply system, and coal and biomass coupled combustion is a powerful response means. The existing coal-fired power plants can burn new fuels without large-scale technical transformation or investment, with small technical risk and additional investment, high flexibility, and are an economically feasible power generation scheme at the present stage. The moisture content of biomass power plant fuel varies widely. In the harvest season, the initial moisture content of crop straw is usually more than 40%, which directly affects the efficiency and stable operation of the boiler. The boiler flue gas composition is unstable and has high moisture content after mixing with biomass, and the effect of directly drying biomass with flue gas is poor. SUMMARY

[0003] The utility model discloses a low-energy-consumption biomass drying device, which dries biomass by efficiently and low-resistance recovering flue gas waste heat to preheat air, so that the biomass is pretreated, upgraded and efficiency-increased with low energy consumption.

[0004] To achieve the above-mentioned purpose, the technical scheme of the utility model is:

[0005] A low-energy-consumption biomass drying device, comprising an efficient air preheater, a rotary drum dryer, a cyclone separator and a water film dust collector, wherein,

[0006] The efficient air preheater is provided with a flue gas inlet, a flue gas outlet, an air inlet and an air outlet, the flue gas outlet is connected with the water film dust collector, and the air outlet is connected with the rotary drum dryer;

[0007] The rotary drum dryer is provided with a biomass wet fuel inlet, a dry fuel outlet and a tail gas outlet, the biomass wet fuel inlet is used for connecting with biomass wet fuel, the dry fuel outlet is used for discharging dry fuel, and the tail gas outlet is connected with the cyclone separator;

[0008] The cyclone separator is provided with a gas outlet and a fuel dust outlet, the gas outlet is connected with the water film dust collector, and the fuel dust outlet is connected with the rotary drum dryer.

[0009] Optionally, the efficient air preheater is a pure counterflow three-dimensional variable space heat exchanger, and the flue gas and the air flow in a reverse parallel manner.

[0010] Optionally, the low-energy consumption biomass drying device further comprises a screw feeder, the discharge port of the screw feeder is connected with the biomass wet fuel inlet of the rotary drum dryer, so as to send the biomass wet fuel into the rotary drum dryer; the screw feeder is further connected with the cyclone separator, and the fuel dust separated by the cyclone separator is sent back to the rotary drum dryer through the screw feeder.

[0011] Optionally, the rotary drum dryer is a reverse parallel friction flow heat exchanger, which is heated by upstream air, and the biomass wet fuel rolls and turns in the drum to mix with the hot air, and the overall movement direction is opposite to the air flow direction.

[0012] Optionally, the high-efficiency air preheater comprises a shell, an upper tube plate and a lower tube plate are arranged in the shell, the area between the shell and the upper tube plate is used as a flue gas inlet, the area between the lower tube plate and the shell is used as a flue gas outlet, the flue gas outlet is connected with the cyclone separator, air inlets and air outlets are arranged on the two sides of the shell, the air inlets are connected with the lower tube plate, the air outlets are connected with the upper tube plate, air corridors are uniformly arranged on the opposite sides of the lower tube plate and the upper tube plate, the air corridors are provided with group partition plates, the upper tube plate and the lower tube plate are provided with tube holes, and a plurality of spiral deformation tube bundle modules are connected and sealed with the upper tube plate and the lower tube plate through the tube holes; and each spiral deformation tube bundle module is externally provided with a wrapping body.

[0013] Optionally, the low-energy consumption biomass drying device further comprises a first induced draft fan, which is arranged in a first pipeline connected with the high-efficiency air preheater and the rotary drum dryer.

[0014] Optionally, the low-energy consumption biomass drying device further comprises a second induced draft fan, which is arranged in a second pipeline connected with the cyclone separator and the water film dust collector.

[0015] Optionally, the low-energy consumption biomass drying device further comprises a third induced draft fan, which is arranged in a third pipeline connected with the flue gas outlet and the water film dust collector.

[0016] Optionally, the spiral deformation tube bundle module is composed of a plurality of spiral deformation tubes and is bound by a fixing belt; and the ratio of the cold and hot medium flow spaces of the high-efficiency air preheater is adjusted according to the deformation coefficient of the spiral deformation tube.

[0017] Optionally, a discharge collection groove is arranged below the dry fuel outlet

[0018] Compared with the prior art, the low-energy consumption biomass drying device has the following beneficial effects:

[0019] The low-energy-consumption biomass drying device provided by the embodiment recycles high-temperature flue gas after biomass fuel combustion, heats air through recycling flue gas waste heat, and dries air relative to flue gas, has the advantages of low moisture content and large drying wet capacity, can better remove moisture of biomass fuel, reduces the moisture content of biomass fuel, increases the combustion energy efficiency of biomass fuel, improves the combustion efficiency, and fully plays the carbon-saving characteristics of biomass energy. At the same time, through the treatment of tail gas, the fuel dust in the tail gas can be used again and the pollution to the environment can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structure schematic diagram of the low-energy-consumption biomass drying device provided by the embodiment is shown in the figure.

[0021] Figure 2 The front view of the high-efficiency air preheater is shown in the figure.

[0022] The top view of the high-efficiency air preheater is shown in the figure.

[0023] Figure 4 The installation schematic diagram of the spiral deformation pipe bundle module is shown in the figure.

[0024] In the figure: 1, high-efficiency air preheater; 2, rotary drum dryer; 3, cyclone separator; 4, water film dust collector; 5, spiral feeder; 6, discharge collection tank; 7, first induced draft fan; 8, second induced draft fan; 9, third induced draft fan. I, first pipeline; II, second pipeline; III, third pipeline; 1-1, flue gas inlet; 1-2, upper tube plate; 1-3, air outlet; 1-4, spiral deformation pipe bundle module; 1-5, fixing belt; 1-6, shell; 1-7, lower tube plate; 1-8, air inlet; 1-9, flue gas outlet; 1-10, blocking plate; 1-11, wrapping body. DETAILED DESCRIPTION

[0025] Embodiment:

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0027] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0028] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first" and "second" can include at least one of the features explicitly or implicitly. In the description of the application, if there are terms "a plurality of", the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0029] In this application, unless otherwise expressly specified and limited, if there are terms "installation", "connection", "connection", "fixation" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise expressly limited. For those skilled in the art, the above terms in the application can be understood according to the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, if there are similar descriptions such as "first feature on or under the second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or it only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or it only means that the horizontal height of the first feature is less than that of the second feature.

[0031] It is to be noted that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In addition, it is to be understood that when an element such as a layer, film, region, or substrate is referred to as being "connected" to or "coupled" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. As used herein, the term "about" when used in reference to a particular recited numerical value, means that the value can vary from the recited value by no more than 1%, 2%, 5%, or 10%. As used herein, the terms "horizontal" and "vertical" are intended to be used in their normal, generally accepted meanings, and are not intended to be limiting.

[0032] Referring to Figures 1-4 As shown in the drawings, the low-energy-consumption biomass drying device provided by the embodiment mainly comprises a high-efficiency air preheater 1, a rotary drum dryer 2, a cyclone separator 3, and a water film dust collector 4.

[0033] The high-efficiency air preheater 1 is provided with a flue gas inlet 1-1, a flue gas outlet 1-9, an air inlet 1-8, and an air outlet 1-3. The air inlet 1-8 is used to introduce ambient air, and the flue gas inlet 1-1 is used to introduce flue gas. In this way, the high-temperature flue gas exchanges heat with the normal-temperature air in the high-efficiency air preheater, and the cooled flue gas tail gas is directly returned to the water film dust collector or the boiler environmental protection device. The heated air is delivered to the rotary drum dryer 2. The rotary drum dryer 2 is provided with a biomass wet fuel inlet, a dry fuel outlet, and a tail gas outlet. The biomass wet fuel inlet is used to introduce biomass wet fuel. After the biomass wet fuel enters the rotary drum dryer 2, the moisture in the biomass fuel is taken away by the hot air, forming dry fuel which is discharged from the dry fuel outlet and collected by the discharge collection groove 6. The dry fuel generates tail gas during the discharging process, and the tail gas contains part of the fuel dust and odor taken away. The tail gas enters the cyclone separator 3 through the tail gas outlet to separate the fuel dust in the tail gas. The separated fuel dust is sent back to the rotary drum dryer 2. The separated tail gas enters the water film dust collector 4, and is discharged into the atmosphere after being filtered by the water film dust collector 4.

[0034] As can be seen, the low-energy-consumption biomass drying device provided by the embodiment recycles the high-temperature flue gas after the combustion of biomass fuel. The air is heated by recycling the waste heat of the flue gas, and the dry air is relatively the flue gas. The low-moisture content and the large wet-drying capacity of the dry air have the advantages of better taking away the moisture of the biomass fuel, reducing the moisture content of the biomass fuel, increasing the combustion energy efficiency of the biomass fuel, improving the combustion efficiency, and fully exerting the carbon-saving characteristics of biomass energy. At the same time, through the treatment of the tail gas, the fuel dust in the tail gas can be utilized again and the pollution to the environment can be reduced.

[0035] In a preferred embodiment, the low-energy consumption biomass drying device further comprises a screw feeder 5, the outlet of the screw feeder 5 is connected with the biomass wet fuel inlet of the rotary drum dryer 2 to send the biomass wet fuel into the rotary drum dryer 2; the screw feeder 5 is also connected with the cyclone separator 3, and the fuel dust separated by the cyclone separator 3 is sent back to the rotary drum dryer 2 through the screw feeder 5. In this way, the biomass wet fuel / fuel dust can be sent into the rotary drum dryer under the action of the screw feeder 5, and the fuel blown back into the inlet by the air in the counterflow state is reduced

[0036] In a specific embodiment, the rotary drum dryer 2 is a reverse parallel friction flow heat exchanger, which is heated by the upstream air, the biomass wet fuel rolls and turns in the drum to mix with the hot air, and the overall movement direction is opposite to the air flow direction, so that the air heat can be fully utilized for drying.

[0037] In a specific embodiment, the high-efficiency air preheater 1 is divided into two processes, and the media inside and outside the tube are parallel pure counterflow heat exchange. The high-efficiency air preheater recovers the waste heat in the high-temperature flue gas by deep recovery, so as to preheat the air for drying and heating, and the cold and hot medium heat end difference is as small as 10-20℃. The flue gas tail gas is sent to the water film dust collector by the induced draft fan, absorbs the odor and is discharged. Specifically, Figures 2-3As shown, the high-efficiency air preheater 1 is a pure counterflow three-dimensional variable space heat exchanger, which includes a shell 1-6, and an air outlet 1-3 and an air inlet 1-8 are arranged on both sides of the shell 1-6; an upper tube plate 1-2 and a lower tube plate 1-7 are arranged in the shell 1-6, the area between the shell 1-6 and the upper tube plate 1-2 serves as a flue gas inlet 1-1, the area between the lower tube plate 1-7 and the shell 1-6 serves as a flue gas outlet 1-9, the air inlet 1-8 and the lower tube plate 1-7 are in communication, the air outlet and the upper tube plate 1-2 are in communication, and air corridors are distributed between the lower tube plate 1-7 and the upper tube plate 1-2, and the air corridors are provided with baffles 1-10; a plurality of spiral deformation tube bundle modules 1-4 are connected and sealed with the upper and lower tube plates through tube holes arranged in the upper tube plate 1-7 and the lower tube plate 1-2, and each spiral deformation tube bundle module 1-4 is externally provided with a wrapping body 1-11. In this way, ambient air can enter from the lower tube plate 1-7, enter the outside of the spiral deformation tube bundle module after being guided by the baffles 1-10 and the wrapping body 1-11, and then be discharged from the upper tube plate 1-2; one end of the spiral deformation tube bundle module 1-4 is in communication with the flue gas inlet 1-1, and the other end is in communication with the flue gas outlet 1-9, and the flue gas outlet 1-9 is also connected to the water film dust collector 4. In specific applications, high-temperature flue gas introduced by the boiler enters the inside of the spiral deformation tube bundle module 1-4 from the flue gas inlet 1-1, is discharged from the flue gas outlet 1-9 after releasing heat, and then returns to the water film dust collector 4 or the boiler environmental protection device, ambient air enters the outside space of the spiral deformation tube bundle module 1-4 from the air inlet 1-8, is discharged from the air outlet 1-3 after absorbing heat, and then enters the rotary drum dryer 2 to dry and process the biomass fuel; in this way, the flue gas and the air perform pure counterflow efficient heat exchange in the high-efficiency air preheater 1, realize super-high-quality heating and super-low-temperature waste heat recovery, the total heat transfer coefficient is increased by 50%-70%, the cold and hot medium end difference can reach 10-20℃, the drying air temperature is greatly increased, the manufacturing is simple, the medium pressure drop can be reduced by 30%-40%, and the volume can be reduced by more than 30% compared with the traditional air preheater on the market. Specifically, the spiral deformation tube bundle module 4 is composed of a plurality of spiral deformation tubes, and is bundled by a fixing belt 1-5 to avoid vibration, the spiral deformation tube is made of stainless steel, ND steel or carbon steel, etc., and the cold and hot medium flow space ratio of the high-efficiency air preheater can be adjusted according to the deformation coefficient of the spiral deformation tube.

[0038] In a preferred embodiment, the low-energy consumption biomass drying device further comprises a first air blower 7, a second air blower 8 and a third air blower 9. The first air blower 7 is arranged in the first pipeline I connecting the high-efficiency air preheater 1 and the rotary drum dryer 2, so that the heated air can be sent into the rotary drum dryer 2 as a heat source to dry the biomass fuel; the second air blower 8 is arranged in the second pipeline II connecting the cyclone separator 3 and the water film dust collector 4, so that the dry air tail gas can be extracted and sent to the water film dust collector 4 for tail gas treatment; and the third air blower is arranged in the third pipeline III connecting the flue gas outlet 1-9 and the water film dust collector 4, so that the flue gas can be extracted to provide power for the flue gas flow. That is, the high-efficiency air preheater 1, the first air blower 7, the rotary drum dryer 2, the cyclone separator 3, the second air blower 8 and the water film dust collector 4 are sequentially connected in series through the first pipeline I and the second pipeline II to form a hot air flow channel, the high-efficiency air preheater 1, the third air blower 9 and the water film dust collector 4 are sequentially connected through the third pipeline to form a flue gas tail gas flow channel, and the dry tail gas is subjected to environmental protection treatment through the cyclone separator and the water film dust collector. The low-temperature air enters the first pipeline through the heat exchanger, the high-temperature flue gas reversely passes through the heat exchanger and then enters the third pipeline, and the two fluids realize full energy exchange in the heat exchanger to efficiently recover the flue gas energy and reduce energy consumption.

[0039] Compared with the prior art, the utility model has the beneficial effects as follows:

[0040] (1) The high-temperature flue gas after combustion of the biomass fuel is recycled and utilized, the air is heated by the flue gas waste heat, and the air is used as a heat transfer medium to dry and pretreat the biomass fuel, thereby reducing the moisture content of the biomass fuel and increasing the combustion energy efficiency of the biomass fuel. Energy waste is saved, energy release efficiency is improved, energy utilization rate is comprehensively improved, and the realization of the national "double carbon" goal is promoted.

[0041] (2) The utility model has a super-efficient air preheater, adopts pure counterflow design, that is, the cold fluid and the hot fluid flow reversely and in parallel, the low-temperature air enters the first pipeline through the heat exchanger, the high-temperature flue gas reversely passes through the heat exchanger and then enters the third pipeline, and the two fluids realize full energy exchange in the heat exchanger to efficiently recover the flue gas energy, reduce energy consumption, have high temperature efficiency and low medium resistance, and the low fan active energy consumption can recover a large amount of heat in the high-temperature flue gas to heat the air to approach the flue gas inlet temperature.

[0042] The above embodiments are only for illustrating the technical concept and characteristics of the utility model, the purpose is to enable those skilled in the art to understand the content of the utility model and implement it, and cannot limit the protection scope of the utility model. Any equivalent changes or modifications made according to the essence of the utility model shall be covered within the protection scope of the utility model.

Claims

1. A low energy consumption biomass drying device, characterized by, The high-efficiency air preheater, the rotary drum dryer, the cyclone separator and the water film dust collector are included. The high-efficiency air preheater is provided with a flue gas inlet, a flue gas outlet, an air inlet and an air outlet; the air outlet is connected with the rotary drum dryer; the flue gas inlet is used for connecting with flue gas, and the air inlet is used for connecting with air, so that the flue gas and the air exchange heat in the high-efficiency air preheater; the heated air enters the rotary drum dryer through the air outlet. The rotary drum dryer is provided with a biomass wet fuel inlet, a dry fuel outlet and a tail gas outlet; the biomass wet fuel inlet is used for connecting with biomass wet fuel; the dry fuel outlet is used for discharging dry fuel; and the tail gas outlet is connected with the cyclone separator. The cyclone separator is provided with a gas outlet and a fuel dust outlet; the gas outlet is connected with the water film dust collector; and the fuel dust outlet is connected with the rotary drum dryer.

2. The low energy biomass drying apparatus of claim 1, wherein, The high-efficiency air preheater is a pure counterflow three-dimensional variable space heat exchanger, and the flue gas and the air flow in a reverse parallel manner.

3. The low energy biomass drying apparatus of claim 1, wherein, A spiral feeder is further included; the discharge port of the spiral feeder is connected with the biomass wet fuel inlet of the rotary drum dryer, so as to send the biomass wet fuel into the rotary drum dryer; and the spiral feeder is also connected with the cyclone separator; the fuel dust separated by the cyclone separator is sent to the rotary drum dryer through the spiral feeder.

4. The low energy biomass drying apparatus of claim 1, wherein, The rotary drum dryer is a reverse parallel friction flow heat exchanger; the upstream air supplies heat; the biomass wet fuel rolls and turns in the drum and mixes with the hot air; and the overall movement direction of the biomass wet fuel is opposite to the air flow direction.

5. The low energy biomass drying apparatus of claim 2, wherein, The high-efficiency air preheater includes a shell; an upper tube plate and a lower tube plate are arranged in the shell; the area between the shell and the upper tube plate is used as the flue gas inlet; the area between the lower tube plate and the shell is used as the flue gas outlet; the flue gas outlet is connected with the cyclone separator; the air inlet and the air outlet are arranged on the two sides of the shell; the air inlet is connected with the lower tube plate; the air outlet is connected with the upper tube plate; air corridors are uniformly arranged on the opposite sides of the lower tube plate and the upper tube plate; the air corridors are provided with group partition plates; the upper tube plate and the lower tube plate are provided with tube holes; a plurality of spiral deformation tube bundle modules are connected and sealed with the upper tube plate and the lower tube plate through the tube holes; and each spiral deformation tube bundle module is externally provided with a wrapping body.

6. The low energy biomass drying apparatus of any one of claims 1-5, wherein, A first air blower is further included; the first air blower is arranged in a first pipeline connected with the high-efficiency air preheater and the rotary drum dryer.

7. The low energy biomass drying apparatus of claim 6, wherein, A second air blower is further included; the second air blower is arranged in a second pipeline connected with the cyclone separator and the water film dust collector.

8. The low energy biomass drying apparatus of claim 7, wherein, A third air blower is further included; the third air blower is arranged in a third pipeline connected with the flue gas outlet and the water film dust collector.

9. The low energy biomass drying apparatus of claim 5, wherein, The spiral deformation tube bundle module is composed of a plurality of spiral deformation tubes and is bundled by a fixing belt; and the cold and hot medium flow space ratio of the high-efficiency air preheater is adjusted according to the deformation coefficient of the spiral deformation tube.

10. The low energy biomass drying apparatus of claim 1, wherein, A discharge collection tank is arranged below the dry fuel outlet.

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