JP2015004475A - Operation control method for woody pellet burner dryer device for clean water producing soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recycle clean water generating soil, sun-dried cake in particular by heating and drying it further economically without increasing environmental load, adjusting moisture percentage content and disinfecting seeds and saprophyte and the like to make sun-dried cake of high added value.SOLUTION: A woody pellet burner dryer device of this invention is constituted of a woody pellet burner unit 1 for generating hot air of high temperature within a main body of an air heating furnace with woody pellet being applied as fuel, and a dryer unit 2 in which hot air of high temperature is supplied from one side of a rotary drum type dryer main body rotatably supported at a desired inclination angle, clean water generating soil is supplied from the other side and clean water generating soil is heated by hot air of high temperature and dried.

Description

  The present invention, by heating and drying the purified water generated by the water purification treatment, economically and efficiently without increasing the environmental load, germination control of seeds, disinfection of germs, etc., The present invention relates to a novel water purification generation wood pellet burner drying system that makes it possible to economically obtain valuable materials that can be reused as horticultural materials.

  In general, in a water purification process at a water purification plant, first, a flocculant is added to the river surface water taken to agglomerate silt or pathogenic insects as turbidity components to form fine flocs. Next, the raw water containing flocs is treated in the precipitation step and the filtration step, the flocs are removed from the raw water containing the flocks, and the clean water after the precipitation / filtration treatment is sent to the reservoir and stored.

The flocs separated and recovered in the precipitation / filtration process are concentrated in the sludge concentration process and then separated into water and cake (purified water generation soil) in the solid / liquid separation process, and the cake is recovered as so-called purified water generation soil. The
In the solid-liquid separation process, the mechanical dehydration method and the sun drying method are often used. The cake separated by the former mechanical dehydration method is the dehydrated cake and the latter sun light. The cakes separated by the drying method are called sun cakes.

  The cake separated in the solid-liquid separation step is a soil containing many kinds of fertile components contained in river water, rich in various mineral components, excellent in water permeability and air permeability, and a plant growth medium. As such, it is suitable for reuse in fields such as agriculture and horticulture.

For this reason, extensive research has been conducted on the reuse of clean water-generated soil (cake). In particular, dehydrated cakes separated by mechanical dehydration method have almost constant properties such as moisture content. And since it is uniform, it can be reused as a soil material for horticultural purposes, a soil material for exercise grounds, etc., and is widely used in practice (Patent Document 1, etc.).
However, since the dehydration process is a mechanical dehydration process, it is generally disadvantageous compared to the case of the sun drying process method in terms of power consumption, the service life of the dehydration facility, the operation management of the facility, etc. There is a problem that it is inferior in economical efficiency in reuse.

  In contrast, solid-liquid separation using the sun drying method requires a relatively large area of the sun drying pond, but the mechanical dehydration method is used in terms of power consumption, service life, ease of maintenance, etc. Compared to, it has many excellent advantages. Therefore, there is a strong demand for the development of an efficient and economical technique for reusing sun cake that takes advantage of these advantages.

By the way, the sun cake taken out from the sun drying pond is generally in the form of a block, and the form (vertical / horizontal / thickness, number of layers, etc.) at the time of unloading depends on the sludge drying condition and the number of times of placing. It changes a lot. As a result, in the sun cake, the water content is inevitably non-uniform, and the particle size and hardness also fluctuate, and stable properties such as moisture content and particle size, quality valuables There is a difficulty that cannot be obtained.
Therefore, in reality, the trays for the effective use of sun cakes are limited mainly to the cement industry, etc., and most sun cakes are sent to landfills in terms of processing costs. It's real.

As described above, in order to effectively use the sun cake obtained by the sun drying method, which is significantly superior in terms of energy consumption compared to the mechanical dehydration method, the sun cake to be reused is used. It is necessary to stabilize the moisture content, particle size, etc., and improve the quality as a valuable material, and it is necessary to perform a drying treatment on the sun cake.
However, there are many problems with the heat energy consumption in the drying process of the sun cake, so in reality, the sun cake is processed by drying and so on to improve its quality and add value. Few water utilities are actively reusing them as valuable resources, and there is almost no recycling of sun cake.

An attempt has been made to recycle the sun cake as a valuable material such as a plant-growing medium by crushing the sun cake with a roll crusher to uniform the particle size of the crushed material (Patent Document 2).
However, the patent document 2 merely arranges the particle size of the crushed material by crushing treatment, and the quality of the crushed sun cake is improved by heat drying treatment, and the added value is further considered. It has not been. In addition, the actual reuse rate of the sun cake by the crushing process is about 20% at the highest, and so-called effective utilization rate is extremely low.
In addition, from the viewpoint of promoting the reuse of the block-shaped sun cake, it is equipped with a rotary blade and a fixed blade, not just by impact shearing. A crushing system configured to perform two-stage crushing has been developed (Patent Document 3).
However, even in the Patent Document 3, there is no mention of heating and drying the crushed sun cake to increase its quality and added value.

Furthermore, in order to expand the sales channel of sun cake and increase its effective utilization rate and productivity, it is necessary to suppress germination of mixed seeds in the sun cake and to disinfect germs. High temperature flammability treatment is an essential requirement.
However, the heat treatment using conventional gas burners and kerosene burners requires a large amount of heat energy to evaporate the water in the sun cake, causing a problem that the fuel cost increases too much. Occasionally, CO ₂ causes another problem that the environmental load increases.
In addition, burner devices using biomass fuel have been developed from the viewpoints of environmental load and fuel-saving resources. However, burner devices using biomass fuel have been developed mainly for steam boilers and hot water boilers. There is no consideration at all for the use of drying water of purified water such as sun cake (Patent Document 4).

JP 2002-305965 A JP 2007-320825 A Japanese Patent No. 4824835 Japanese Patent No. 4566043

  The present invention relates to the following problems in the conventional recycling of solar cake, that is, conversion into a reusable valuable material, namely, (a) only by crushing the solar cake, It is difficult to significantly increase the added value of cake, and as a result, the reuse range (sales channel) of sun cake becomes extremely narrow, and the utilization rate as a valuable resource cannot be increased. (B) Kerosene The heat treatment using gas or gas as a heat source cannot solve the problems such as reducing the cost of recycling the cake for the sun and increasing the environmental burden. Fuel costs, equipment costs, It is possible to significantly reduce running costs, etc., and to stably apply the desired heat-drying treatment to the sun cake without causing an increase in environmental load. Seeds with a rate The present invention provides a wood pellet burner drying apparatus for generating purified water and a method for controlling the operation thereof, which can economically obtain high-value-added valuable materials in which germination control and germs disinfection are performed.

The inventors of the present application have previously developed a sun cake crushing system (Patent Document 3) in order to promote the effective use of the sun cake with the same particle size, and by providing so-called carbon neutral characteristics. In addition, a combustion device (Patent Document 4) that uses wood pellets as fuel that can prevent an increase in environmental load has been developed and disclosed.
The present invention was devised in the course of the development and implementation of the above-mentioned sun cake crushing system and wood pellet combustion apparatus, and the purified water generation soil (sun sun) separated from the concentrated sludge by the sun drying method. Cake) is crushed, heated and dried with the combustion gas from the wood pellet combustor, and has a desired particle size and moisture content, and is a valuable material that has completely killed seeds and germs (sun cake) ) Was more economically efficient.

  The present invention was created based on the above idea of the inventors of the present application, and in particular, low environmental load and high economic efficiency in the conversion process of sun cake to high-value valuables, With the main tasks of achieving high-precision control of the heating and drying temperature, ensuring high safety, ease of maintenance, etc., we conducted a sun cake drying test using a drying experiment apparatus as shown in FIG. (B) Relation between the amount of sun cake input and drum rotation speed and cake temperature after drying, (b) Relation between exhaust gas temperature at the outlet of the dryer and sun cake temperature after drying, (c) Sun after drying The relationship between the cake temperature, the moisture content of the sun cake and the input heat amount was investigated.

In addition, in the test by the experimental apparatus of FIG. 10, the moisture content of the sun cake K to be charged is 38.6 to 45.2% (sun cake at the Mino Water Purification Plant in Okayama City), the amount of sun cake input is 170 kg / h, and 340 kg / h, dryer drum 61 rotation speed 2 rpm and 4 rpm, charged sun cake K particle size less than 20 mm, dried sun cake Ka temperature 80 ° C., estimated residence time 15 minutes (2 rpm).
The dryer drum 61 has a length of 4500 mm and a diameter of 750 mm, a thermocouple is used for the thermometer 62a, and the kerosene burner 60 is controlled to be turned on and off to maintain the exhaust gas temperature at a set temperature. The sun cake temperature after drying was measured with the thermometer 62b. In FIG. 10, 61a is an exhaust gas outlet, 61b is a dry matter outlet, 61c is an air inlet, 62 is a temperature setting device, 63 is a burner ON-OFF controller, G is hot air, Go is exhaust gas, and K is sunlight. Cake, Ka is a dried product.

  Table 1 shows the test results by the above experimental apparatus. From these test data, (a) there is a high correlation between the input amount of the sun cake and the sun cake temperature after drying, The amount of input of the sun cake is an important factor for controlling the temperature of the sun cake (dried material) after drying, and (b) the drum rotation speed is less important as a factor for controlling the temperature of the dry product, C) The dry matter temperature is an important control factor for the moisture content of the dry matter, and (d) there is a correlation between the exhaust gas temperature at the outlet of the dryer and the temperature of the dry matter. It became clear that it was an important control factor of dry matter temperature, and (e) that the exhaust gas temperature at the outlet of the dryer could be controlled by the amount of heat input.

In other words, it has been found that the sun cake drying process using a rotary drum dryer requires at least the following control systems (a) and (b).
B) It is possible to control the supply amount of sun cake using the exhaust gas temperature at the exhaust gas outlet of the dryer as a setting index.
This is because the exhaust gas temperature at the outlet of the dryer exhaust gas has a correlation with the dry matter temperature, and the dry matter temperature has a correlation with sterilization and water content adjustment.
B) It is possible to control the amount of heat input to the dryer (ie, the amount of heat generated by the burner) using the temperature of the dried product as a setting index.
This is because the dry matter temperature correlates with sterilization and moisture content adjustment, and the moisture content and input amount of the sun cake have a correlation with the input heat amount.

  In addition, the amount of heat of evaporation of water was roughly calculated from the actually measured data in Table 1, and the necessary amount of input heat and the like were calculated therefrom. Table 2 below shows the results.

注） 乾燥機出口試料温度が100℃以上の場合も便宜上水として熱量を求めた。
水の顕熱＋潜熱は、610kcal/kg（一定）とした。
バーナ排ガスの比熱は0.315kcal/Nm³・℃（一定）とした。

Note) When the sample temperature at the outlet of the dryer is 100 ° C or higher, the calorific value was obtained as water for convenience.
The sensible heat + latent heat of water was 610 kcal / kg (constant).
The specific heat of the burner exhaust gas was 0.315 kcal / Nm ³ · ° C (constant).

From Table 2 above, for example, in run4 (sample moisture content 42%, sun cake input rate 360 kg / h, drum rotation speed 2 rpm), the dry matter temperature is set as the standard for seed germination control and germ disinfection. Since the temperature is 100 ° C above 80 ° C, assuming that the dry matter temperature is 80 ° C, it requires 107,827kcal / h which is 80% (80% / 100 ° C) of the calculated input amount 134,784kcal / h. It will be. Now, assuming that the capacity of the demonstration plant is 300 kg / h, the required amount of heat is 89,855 kcal / h, which is 83% of 107,827 kcal / h (300 kg / h ÷ 360 kg / h).

  As a result, in order to be able to cope with a high moisture content of 42% or more (47.6% by proportional calculation → sun cake of Okayama Mino water purification plant), the capacity of the wood pellet burner is 100,000 kcal / h. On the other hand, if the water content is 25% (assuming the sun cake of Asahi Higashi Water Treatment Plant in Okayama City), it is found that the processing capacity is 560kg / h by proportional calculation.

In addition, the burning rate of the wood pellets is much slower than that of gas or oil fuel, so the amount of combustion cannot be controlled quickly. Therefore, it is possible to control the exhaust gas temperature at the outlet of the dryer by adjusting the amount of generated heat by controlling the pellet supply amount, adjusting the generated hot air temperature with the amount of diluted air that is relatively quickly controlled, and blowing it to the dryer. I knew that I needed it.
Furthermore, since the amount of exhaust gas at the outlet of the dryer always changes depending on the amount of combustion and the amount of diluted air, it has been found that it is necessary to control the internal pressure of the dryer to be constant and to control the amount of exhaust air from the dryer.

  The present invention was invented based on the results of the basic experiment as described above and various knowledge obtained from the analysis thereof, and the present invention of the present invention comprises a hot stove main body using wood pellets as fuel, A wood pellet burner unit 1 for generating hot air, comprising a screw feeder for supplying wood pellets, a hot air temperature detector at the outlet of the hot air furnace body, and a blower for supplying diluted air into the hot air furnace body, and a predetermined inclination A dryer body that is rotatably supported by a corner, is supplied with the high-temperature hot air from one side and is supplied with purified water generation soil from the other side, an exhaust gas temperature detector at the exhaust gas outlet of the dryer body, and purified water generation soil The basic structure of the present invention is that it is composed of a drying unit 2 for drying purified water-generating soil provided with a pressure screw and a pressure adjusting exhaust in the dryer body.

  The wood pellet burner unit 1 includes an ignition kerosene burner, a combustion air supply blower, a digestion water supply mechanism, an ash receiving box, a pellet supply cutoff damper, and a pellet pushing blower. Is desirable.

  Further, it is desirable that the dryer unit 2 includes a drum-type dryer body having a dryer body pressure detector, a weight damper provided at the dried product outlet, and a tilt angle adjusting mechanism of the dryer body.

  The water-purifying soil is preferably a sun cake, and the sun cake supplied to the dryer body has an outer diameter or a length, width, thickness of at least 20 to 30 mm or less.

  The method of the present invention according to claim 5 is the wood pellet burner drying apparatus according to claim 1, wherein the amount of pellets supplied to the hot stove main body is maintained so that the outlet side exhaust gas temperature of the dryer main body is maintained at a predetermined temperature. Feedback control of the dilution air supply amount to the hot stove main body so as to keep the hot air temperature from the hot stove main body at a desired temperature, and further to maintain the internal pressure of the dryer main body at a predetermined pressure. In addition, the temperature of the purified water generating soil after drying is maintained at 80 ° C. or higher by feedback control of the amount of exhaust air from the dryer main body.

  Moreover, it is desirable that the exhaust gas outlet temperature of the dryer main body is 100 to 150 ° C, and the hot air temperature from the hot stove main body is 150 to 200 ° C.

  Furthermore, while making the purified water generation soil into a sun cake, the amount of combustion air supplied to the hot air generator main body, the amount of sun cake supplied to the dryer main body and the rotation speed of the dryer main body can be set and adjusted to desired values. It is desirable to make it.

  In the present invention, a wood pellet burner unit that generates high-temperature hot air in a hot-blast furnace main body using wood pellets as fuel, and a dryer unit mainly composed of a rotating drum type rotating machine main body arranged in an inclined posture. Combined with the configuration, high-temperature hot air and purified water generation soil are opposed to each other in the dryer body, and the purified water generation soil is heated and dried, so the use of regenerated fuel is extremely economical and does not increase the environmental load. In addition, it is possible to obtain a high-quality dried product (dried water from which purified water has been generated) that has been heated and dried to a temperature of 80 ° C. or higher, which is necessary for inhibiting germination of seeds and disinfecting various bacteria.

  In addition, since the dryer body is provided with a screw feeder for supplying the material to be dried, and the dried material is discharged outside through the weight damper, the hermeticity of the dryer body is improved and high temperature controllability is achieved. Can be obtained.

  Furthermore, backfire to the pellet service silo is completely prevented by closing the shut-off damper by the detection signal of the temperature sensor attached to the pellet supply system and releasing water from the fire-extinguishing water tank by opening the solenoid valve. It is possible to ensure high safety.

  In the method invention of the present application, the feed amount of the wood pellet fuel to the hot air generating furnace main body is feedback controlled by the exhaust gas temperature at the dryer main body outlet, and the dilution air supply amount is fed back by the hot air temperature at the hot air generating furnace main body outlet. Control and adjust the exhaust air volume by the internal pressure of the dryer body, so that the purified water generation soil is heated and dried at a temperature of 80 ° C. or higher, based on the outlet exhaust gas temperature of the dryer body, With a control system having a simple configuration, germination suppression and germ disinfection by seeds in the treatment area after drying can be reliably and safely performed.

It is explanatory drawing which shows the structure outline | summary of the wood pellet burner drying apparatus of the purified water generation soil which concerns on this invention. Drawing 2 is an explanatory view showing the composition outline of the purified water generation soil recycling plant to which the wood pellet burner drying device is applied. It is a top view which shows the principal part of a wood pellet burner drying apparatus. FIG. 4 is a front view of FIG. 3. FIG. 4 is a right side view of FIG. 3. It is a systematic diagram which concerns on the Example of a wood pellet burner drying apparatus. It is a feedback control system diagram in the operation of the wood pellet burner drying apparatus according to the present invention. It is a figure which shows the burner control range by the combustion test of the wood pellet burner drying apparatus of FIG. It is a curve which shows the control responsiveness of the wood pellet burner drying apparatus of FIG. It is a schematic diagram of the drying test apparatus of a sun cake.

  FIG. 1 is an explanatory diagram showing a configuration outline of a wood pellet burner drying apparatus according to the present invention, and FIG. 2 is a configuration outline of a water purification soil recycling plant to which the wood pellet burner drying apparatus of FIG. 1 is applied. FIG.

  Referring to FIG. 1, the wood pellet burner drying apparatus A of the present invention is mainly composed of a wood pellet burner unit 1 and a dryer unit 2, and a dust collector unit 4 and a control panel unit 3 are added thereto. Etc. are attached. And while the to-be-processed object (sun cake) B injected | thrown-in to the sun cake inlet 2a of the dryer unit 2 flows through the inside of the dryer unit 2 in the arrow A direction, it is from the wood pellet burner unit 1. It is heated and dried by the high-temperature hot air C, and is carried out from the dried product discharge port 2b.

In addition, as shown in FIG. 2, the said wood pellet burner drying apparatus A is normally used in the state which connected the sun cake crushing unit 5 and the bagging unit 6 to the front | former stage and back | latter stage. That is, from the sun cake figurine D to the dryer unit 2 of the wood pellet burner drying apparatus A, through the crusher unit 5 comprising the conveyor E ₁ , crusher 5 a, conveyor E ₂ , crushing feeder 5 b, and conveyor E _3. Thus, the workpiece B having a predetermined particle size is continuously supplied with a predetermined supply amount.
Also, the dried dried product (sun cake) B ′ discharged from the sun cake discharge port 2b of the dryer unit 2 is conveyed to the bagging machine unit 6 via the conveyors E ₄ and E ₅ , Here, the dried sun cake is packed in a bag and shipped as product (valuable) F.

  3 is a plan view of a wood pellet burner drying apparatus A according to the present invention, FIG. 4 is a front view thereof, FIG. 5 is a right side view thereof, and in FIGS. 3 to 5, 1 is a wood pellet burner unit, 2 Is a dryer unit, and the dust collector unit 3 and the control panel unit 4 shown in FIG. 1 are omitted.

The wood pellet burner unit 1 includes a hot stove main body 7, a burner 7a, a service silo 8, an oil tank 9, a nozzle chip 10, an ash receiving box 11, a sirocco fan 12, and the like as shown in FIG. The hot-air furnace main body 7 and the high-temperature hot air C generated therein are supplied to the dryer unit 2 through the duct 7c.
In addition, the detail of the structural member of the wood pellet burner unit 1 is demonstrated in detail using below-mentioned FIG.

The dryer unit 2 has a configuration in which a rotary drum type dryer main body 13 is rotatably supported on a support base 14, and is rotationally driven by a rotational drive motor 15 at a rotational speed of 1 to 5 rpm.
Further, the dryer body 13 is disposed with an inclination angle θ of 2 to 4 degrees with respect to the horizontal direction, and the sun cake B is loaded with the burner unit 1 side (the dried product discharge port 2b side) downward. The mouth 2a side is located above each.
Further, the inclination angle θ of the rotary drum dryer main body 13 can be adjusted by an inclination angle adjusting mechanism (not shown), and is usually adjusted to θ = 2.5 degrees.

  A pushing screw 19 is provided on the side of the dryer main body 13 to be processed (sun cake) inlet 2 a, and the object to be dried (sun cake) B to be dried by the pushing screw 19 is the main body 13. It is extruded and supplied.

  Further, a weight damper 20 is provided at the discharge port 2b of the dried product (dried sun cake) B ′ of the dryer main body 13, and the workpiece B heated and dried by the high-temperature hot air C that is a counterflow. By depositing a predetermined amount of ', the weight damper 20 is intermittently opened, and thereby the airtightness in the dryer main body 13 is maintained.

The exhaust gas after heating and drying the object to be processed B is discharged to the outside from the exhaust gas outlet 18 provided at the inlet side end of the object to be processed B of the dryer body 13.
The basic configuration of the dryer unit 2 itself is substantially the same as that of a known rotary drum dryer, and therefore detailed description thereof is omitted here.

  FIG. 6 is a configuration system diagram according to the embodiment of the wood pellet burner drying apparatus according to the present invention, and shows details of each component forming a part of the wood pellet burner unit 1 and a part of the dryer unit 2. It is. The dust collector unit 4 and the control panel unit 3 are omitted.

  The wood pellet burner unit 1 includes a hot stove main body 7 corresponding to a hot stove, a service silo 8 serving as a wood pellet fuel supply unit, an oil tank 9 forming an ignition unit, a nozzle tip 10 of a burner 7a, an ash receiving box 11, a combustion It is composed of a sirocco fan 12 for supplying air.

  In FIG. 6, 22 is a furnace wall material of the hot stove body, 23 is a thermocouple, 24 is a thermocouple for detecting exhaust gas temperature, 25 is a vibration sensor, 26 is a blower for supplying diluted air, and 27 is Damper control motor, 27a is a damper, 28 is a blower for supplying secondary combustion air, 29 is a blower for supplying combustion air, 30 is a flame eye, 31 is an ignition rod, 32 is an integrated ignition rod, 33 is a diffuser, 34 is An ignition transformer, 7c is an air box, 35 is a flexible tube, 36 is an electromagnetic pump, and 37 is a strainer. An ignition burner 7a is constituted by various devices such as the frame eye 30 to the strainer 37.

Also, 38 is a screw feeder, 39 is an inverter control motor, 40 is a coupling, 41 is a cutoff damper, 42 is a temperature controller, 43 is a temperature controller, 44 is a blowback fan for preventing backfire, 45 is a fire extinguishing water tank, 46 Is a ball valve, 47 is an electromagnetic valve, 48 is a flexible tube, 49 is a pellet supply duct, and safety devices such as a digestion water supply mechanism and a backfire mechanism are constituted by devices such as the cutoff damper 41 to the flexible tube 48. Has been.
Reference numeral 50 is a thermocouple, 51 is an exhaust fan, and 52 is a slight differential pressure gauge.

Referring to FIG. 6, the supply amount of the wood pellets having a particle diameter of 6 mm supplied to the service silo 8 is adjusted by the screw feeder 38, and enters the hot stove main body 7 through the shut-off damper 41 and the pellet supply duct 49. Supplied.
The wood pellet burner unit 1 is ignited by a kerosene burner that burns oil from the oil tank 9 and then switched to pellet combustion. The wood pellet burner unit 1 is fired on a fire bed formed by a ceramic ball layer provided in the hot stove body 7. Is fluidly burned.

Combustion air is supplied into the hot stove main body 7 from the sirocco fan 12, the turbo blower 28, and the like, and dilution air is supplied through the blower 26 and the damper 27a.
Incinerated ash collected in the hot stove main body 7 is discharged to the ash receiving box 11.

  In addition, since the structure itself of the hot stove main body 7 etc. is well-known, the detailed description is abbreviate | omitted here, However, (1) For the operation control of the wood pellet burner drying apparatus A, drying machine exit waste gas temperature A thermocouple 50 that detects the amount of wood pellets, an inverter control motor 39 that controls the supply amount of wood pellets, a damper control motor 27 that controls the amount of diluted air, and (2) an oil tank 9 used for starting the hot stove main body 7; An ignition kerosene burner including an ignition transformer 34, a strainer 37, an electromagnetic pump 36, an ignition rod 31, an integrated ignition rod 32, a nozzle chip 10, a diffuser 33, and the like, and (3) For improving safety, Shut-off damper 41, temperature controller 42, water discharge mechanism (fire extinguishing water tank 45, ball valve 46, solenoid valve 47, flexible Tube 48, etc.), sensitive exciter 25, a point in which a flame eye 30 or the like for misfire detection is different from its structure to the known hot-air furnace body 7.

Although not shown in FIG. 6, in the control panel unit 3, an adjuster TIC _{1 for} controlling the hot air temperature at the outlet of the hot stove main body 7 shown in FIG. A regulator TIC ₂ for controlling the exhaust gas temperature at the outlet of the main body 13 by the amount of wood pellets supplied and a regulator PIC for controlling the internal pressure of the dryer main body 13 by the amount of exhaust air are provided.

FIG. 7 is a feedback control system diagram in the operation of the wood pellet burner drying apparatus according to the present invention. The wood pellet burner unit 1 is supplied with wood pellets, combustion air and dilution air to the hot stove body 7 respectively. The dilution air supply is adjusted by the temperature controller TIC ₁ such that the hot air temperature (thermocouple 24) at the outlet of the hot stove main body 7 is maintained at a set value.
Similarly, the pellet supply to the hot stove main body 7 is adjusted by the temperature controller TIC ₂ so that the outlet exhaust gas temperature (thermocouple 50) of the dryer main body 13 is maintained at a set value.

  The supply amount of combustion air into the hot stove body 7 is controlled separately according to the supply amount of pellets, and the supply amount of the object to be processed (sun cake) into the dryer body 13 and the drum rotation speed Of course, it is controlled separately to a predetermined set value.

  In addition to supplying hot hot air and raw material (sun cake) from the burner body 7 to the dryer body 13 of the dryer unit 2, the internal pressure of the dryer body 13 is adjusted, and the dryer body On the basis of the detected value of the fine differential pressure gauge 51 provided at the 13 exhaust gas outlets, the exhaust air amount by the exhaust air fan 52 is adjusted by the pressure regulator PIC.

FIG. 8 shows a result of confirming a burner control range by a combustion test performed using the wood pellet burner apparatus A according to the present invention shown in FIG. 6. The length of the dryer body 13 is 4,000 mm, It is an actual measurement value when the outer diameter is 500 mm and the calorific value of the wood pellet burner is 100,000 kcal / h.
That is, since the lower calorific value of the wood pellet used was 4260 kcal / h, the maximum supply amount was 30.5 kg / h (130,000 ÷ 4260). Further, if the supply amount is 7.6 kg / h or more, misfire does not occur even when the pellets are burned alone, so the minimum supply amount is 7.6 kg / h.

  FIG. 9 shows the response characteristic test results of the hot air temperature at the outlet of the hot blast furnace body 7 and the exhaust gas temperature at the exhaust gas outlet 18 of the dryer body 13 in the wood pellet burner drying apparatus A of FIG. The state of each change (responsiveness) is shown when the hot air temperature at the outlet of the hot stove main body 7 is increased from 150 ° C. to 200 ° C., and the exhaust gas temperature at the outlet of the dryer main body is simultaneously increased from 100 ° C. to 150 ° C. Is.

In FIG. 9, curve Q is the hot air temperature at the outlet of the main body of the hot stove ° C, L is the supply amount of wood pellets kg / h, M is the exhaust gas temperature at the outlet of the main body of the dryer, N is the exhaust gas amount (act × 10 m ³ / h), O is the pressure (Pa) at the outlet of the dryer body.

  By using wood pellets as fuel, there will be a time delay in the responsiveness of the feedback control corresponding to changes in the combustion state, etc. As is clear from FIG. 9, variable adjustment of the pellet supply amount and dilution air flow rate Thus, it can be seen that the exhaust gas temperature M at the outlet of the dryer body, which is the target value, can be controlled with a response time delay of about 2 minutes or less.

  Table 3 is a comparison of the running cost, environmental load, etc., when using the wood pellet burner drying apparatus A according to the present invention and using the burner drying apparatus using kerosene or gas as fuel. It can be seen that the present invention has excellent utility in terms of running cost and environmental load.

  In addition, it was found that various germs such as seeds and mold mixed in the object to be treated (sun cake) can be sterilized by being heated at a temperature of about 80 ° C. or more and germination of the seeds is suppressed. ing. Therefore, in the wood pellet burner drying apparatus A according to the present invention, the heating residence time of the sun cake can be arbitrarily adjusted by adjusting the inclination angle of the dryer body 13 and its rotation speed, and the moisture content can be adjusted. Adjustment, suppression of seed germination, and disinfection of miscellaneous fungi can be performed reliably, easily, and more economically.

  The present invention can be applied not only to the sun cake, but also to heat drying treatment of any purified water generation soil, and also adjusts and controls the supply amount of wood pellets, the amount of combustion air, the amount of diluted air, and the amount of exhaust air according to the application. Therefore, it can be applied to heat drying of various raw materials.

A Wood pellet burner drying equipment B Object to be processed (sun cake)
B 'Dried food (dried sun cake)
C High-temperature hot air D Sun cake storage E Conveyor F Packed product 1 Wood pellet burner unit 2 Dryer unit 2a Material (sun cake) inlet 2b Dried material (processed sun cake) outlet 3 Control panel unit 4 Dust Collector Unit 5a Crusher 5b Crushing Supply Unit 6 Packing Unit 7 Hot Air Furnace Body 7a Burner 7b Air Box 7c Duct 8 Service Silo 9 Oil Tank 10 Nozzle Tip 11 Blower 13 Rotary Drum Type Dryer Body 14 Drying Support frame for machine main body 15 Motor for driving rotation of dryer body 16 Dryer body support roller 18 Exhaust gas outlet 19 Sun cake push screw 20 Dry material discharge weight damper 21 Ladder 22 Furnace wall material 23 Thermocouple 24 Thermoelectric Anti-vibration sensor 25 Blower 27 Damper control motor 27a Damper 2 Blower 29 Blower 30 Frame eye 31 Ignition rod 32 Integrated ignition rod 33 Diffuser 34 Ignition transformer 35 Flexible tube 36 Electromagnetic pump 37 Strainer 38 Screw feeder 39 Inverter control motor 40 Coupling 41 Shut-off damper 42 Temperature adjuster 43 Temperature adjuster 44 Reverse Pushing blower for fire prevention 45 Fire extinguishing water tank 46 Ball valve 47 Solenoid valve 48 Flexible tube 49 Duct for wood pellet supply 50 Thermocouple 51 Micro differential pressure gauge 52 Ventilator

The present invention was invented on the basis of the results of the basic experiment as described above and various knowledge obtained from the analysis thereof. The invention of claim 1 includes a hot stove main body using wood pellets as fuel, A wood pellet burner unit 1 for generating hot air comprising a screw feeder for supplying pellets, a hot air temperature detector at the outlet of the main body of the hot air furnace, and a blower for supplying diluted air into the main body of the hot air furnace, and a predetermined inclination angle A dryer main body that is rotatably supported and is supplied with the high-temperature hot air from one side and supplied with purified water generation soil from the other side, an exhaust gas temperature detector at the exhaust gas outlet of the dryer main body, and pushing the purified water generation soil a screw, at a water purification occurs doyo wood pellet burners drying apparatus and the drying unit 2 for water purification soil generated drying and a pressure adjusting exhaust fan consisted in the dryer main body, exits dryer body Feedback control of the pellet supply amount to the hot stove body so as to keep the side exhaust gas temperature at a predetermined temperature, and the dilution air supply amount to the hot stove body so as to keep the hot air temperature from the hot stove body at a desired temperature. Feedback control and feedback control of the exhaust air flow from the dryer main body so that the internal pressure of the dryer main body is maintained at a predetermined pressure, so that the temperature of the dry matter from the dry matter outlet of the dryer main body is maintained at 80 ° C or higher. This is the basic configuration of the invention.

The invention of claim 2 is the invention of claim 1, wherein the hot air temperature from the hot stove main body is set to 150 to 200 ° C., and the exhaust gas outlet temperature of the dryer main body is set to 100 to 150 ° C. .

The invention of claim 3 is the invention of claim 1, wherein the purified water generation soil is a sun cake, the amount of combustion air supplied to the hot air generating furnace body, the amount of sun cake supplied to the dryer body, and the dryer body Is adjusted to a desired value.

According to a fourth aspect of the present invention, there is provided a water purification wood pellet burner drying apparatus according to the first aspect of the present invention, a kerosene burner for igniting a hot blast furnace main body of the wood pellet burner unit 1, a blower for supplying combustion air, A water supply mechanism, an ash receiving box, a pellet supply cutoff damper, and a pellet pushing fan are provided.

Claims (7)

  A hot blast furnace body that uses wood pellets as fuel, a screw feeder for supplying wood pellets, a hot air temperature detector at the outlet of the hot blast furnace body, and a blower for supplying diluted air into the hot blast furnace body. A wood pellet burner unit (1), a dryer main body that is rotatably supported at a predetermined inclination angle, is supplied with the high-temperature hot air from one side and is supplied with purified water generation soil from the other side, and a dryer main body Exhaust gas temperature detector at the exhaust gas outlet, a pusher screw for the purified water generation soil, and a dryer unit (2) for drying the purified water generation soil provided with a pressure adjusting exhaust in the dryer body. A wood pellet burner dryer for clean water generation soil.   Wood pellet burner unit (1) equipped with a kerosene burner for ignition, a blower for supplying combustion air, a fire extinguishing water supply mechanism, an ash receiving box, a pellet supply shut-off damper, and a pellet pushing fan on the main body of the hot stove The wood pellet burner drying apparatus for generating purified water according to claim 1.   2. A dryer unit (2) comprising a drum-type dryer body having a dryer internal pressure detector, a weight damper provided at a dried product outlet, and a tilt angle adjusting mechanism of the dryer body. A wood pellet burner drying device for use in the generation of purified water as described.   The purified water generating soil according to claim 1, wherein the purified water generating soil is a sun cake and the outer diameter or the vertical, horizontal, and thickness of the sun cake supplied to the dryer body is 20 to 30 mm or less. Wood pellet burner drying equipment.   In the wood pellet burner drying apparatus of the purified water generating soil according to claim 1, the feed amount of pellets to the hot stove body is feedback controlled so that the exhaust gas temperature on the outlet side of the dryer body is maintained at a predetermined temperature, and the hot stove Feedback control of the dilution air supply amount to the hot stove main body to keep the hot air temperature from the main body at a desired temperature, and feedback of the exhaust air amount from the dryer main body to keep the internal pressure of the dryer main body at a predetermined pressure The operation control method of the wood pellet burner drying apparatus for purified water generation soil made into the structure which maintains the dried material temperature from the dried material exit of a dryer main body to 80 degreeC or more by controlling.   The operation of the wood pellet burner drying device for generating purified water according to claim 5, wherein the temperature of hot air from the hot stove main body is 150 to 200 ° C and the exhaust gas outlet temperature of the dryer main body is 100 to 150 ° C. Control method.   Claim that the purified water generation soil is a sun cake, and that the amount of combustion air supplied to the hot air generator main body, the amount of sun cake supplied to the dryer main body and the rotation speed of the dryer main body are adjusted to desired values Item 6. A method for controlling the operation of the wood pellet burner drying apparatus for generating purified water according to item 5.

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