CN201217646Y - Spiral Rotary Sludge Drying Machine - Google Patents

Abstract

The utility model relates to a harmless and resourceful treatment equipment for solid waste, and aims to provide a spiral rotary sludge drying and forming machine. It includes a shell, and at least one hollow thermal shaft connected to the transmission mechanism is installed inside. Several hollow paddles are arranged on the hollow thermal shaft. The two ends of the hollow thermal shaft are respectively connected to the heat carrier inlet. The middle part of the hollow thermal shaft passes through the shell A heat carrier outlet is drawn out; a wet material inlet is provided at the upper part of one end of the housing, and a product outlet is provided at the lower part of the other end; a jacket is provided on the housing, and a steam inlet and a condensed water outlet are arranged on the jacket. The equipment completes the drying and forming of wet sludge at one time, and the space of the dryer becomes smaller and smaller as the sludge dries, which saves equipment investment; the sludge is dried by using the low-grade steam turbine of the power plant, which fully saves energy; Sludge is made into granulated fuel, which is beneficial to further grinding and incineration; it has important application value for solving the urgent problem of urban sewage sludge treatment in our country.

Description

Spiral Rotary Sludge Drying Machine

technical field

The utility model relates to a solid waste harmless recycling treatment equipment, more specifically, the utility model relates to a spiral rotary sludge drying molding machine.

Background technique

With the acceleration of my country's urbanization process and the strengthening of urban infrastructure construction, the urban sewage treatment rate has gradually increased, accompanied by a large amount of excess sludge. If these sludges cannot be treated in a timely, effective and stable manner, it will bring great hidden dangers to the safety of our regional environment and people's lives. In addition, industrial processes such as papermaking, chemical and pharmaceutical industries, and dredging of rivers and lakes also generate large amounts of sludge. The harmless treatment of sludge has become a major environmental protection problem that must be solved in the process of urban scientific development.

The moisture content of the sludge after dehydration in the sewage treatment plant is as high as 75-85%, and the volume is huge. Whether the final sludge treatment method is incineration or other uses, the drying and shaping of sludge are very important. Dried sludge is a valuable raw material that is easily stored under safe conditions and can be incinerated in an incinerator, or used as a fuel for the production of cement, or as a fertilizer for farmland.

In the prior art, the drying and forming of wet sludge is generally step-by-step. For example, after drying in a drying rotary kiln, it is sent to a crushing equipment for crushing to obtain sludge particles. This process requires the establishment of a rotary kiln and crushing equipment. At the same time, the rotary kiln also needs to provide additional heating facilities, and the overall cost is relatively high.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art and provide a spiral rotary sludge drying molding machine.

In order to solve the above technical problems, the utility model is achieved through the following technical solutions:

The utility model provides a spiral rotary sludge drying forming machine, which comprises a casing. At least one hollow thermal shaft connected to a transmission mechanism is installed inside the forming machine. Several hollow paddles are arranged on the hollow thermal shaft. The hollow thermal shaft The two ends of the two ends are respectively connected to the heat carrier inlet, and the middle part of the hollow heat shaft passes through the shell to lead to the heat carrier outlet; the upper part of one end of the shell is provided with a wet material inlet, and the lower part of the other end is provided with a product outlet; the shell is provided with a jacket , steam inlet and condensate outlet are set on the jacket.

As an improvement of the utility model, there are two hollow heat shafts.

As an improvement of the utility model, the paddle is wedge-shaped, and is obliquely installed on the hollow thermal shaft.

As an improvement of the utility model, the blades are propeller blades.

As an improvement of the utility model, an air inlet and an air outlet are also provided on the housing.

Compared with the prior art, the beneficial effects of the utility model are:

(1) The drying and molding machine completes the drying and molding of wet sludge at one time, and the space of the dryer becomes smaller and smaller as the sludge dries, saving equipment investment;

(2) Utilize the low-grade turbine steam that has done work in the power plant to dry the sludge to fully save energy;

(3) The sludge is made into granular shaped fuel, which is conducive to further grinding and incineration;

(4) The calorific value in the sludge can be fully utilized after the sludge particles are turned into fuel, and the volume of the sludge can be reduced by more than 90% after drying treatment, which has important application value for solving the urgent problem of urban sewage sludge treatment in our country.

Description of drawings

Fig. 1 is a schematic diagram of the dryer structure;

Fig. 2 is a schematic diagram of a sectional structure of a dryer;

Fig. 3 is a schematic diagram of the structure of the hollow heat shaft of the dryer;

Fig. 4 is a schematic diagram of the wedge-shaped paddle structure of the dryer;

Fig. 5 is a schematic diagram of the wedge-shaped paddle structure of the dryer;

In the figure: 1-W-shaped tank body; 2-hollow thermal shaft; 3-top cover; 4-bearing and stuffing box; 5-jacket; 6-wedge blade; 7-gear; 8 speed control device; 9- swivel joint; 10-sprocket.

Detailed ways

Referring to the accompanying drawings, the utility model will be described in detail below in conjunction with the embodiments.

In this embodiment, a spiral rotary sludge drying molding machine is provided for wet sludge treatment, the structure of which is shown in FIG. 1 .

Two hollow thermal shafts 2 connected to the transmission mechanism are installed inside the screw rotary sludge drying and forming machine. Several hollow wedge-shaped paddles 6 are arranged on the hollow thermal shafts 2, and the interior thereof communicates. The two ends of the hollow thermal shaft 2 are respectively connected to the heat carrier inlet, and the middle part of the hollow thermal shaft 2 passes through the shell to lead to the heat carrier outlet; the wedge-shaped paddle 6 is installed obliquely on the hollow thermal shaft 2, and the inclination direction allows the sludge material to flow The wedge-shaped paddle 6 pushes down and moves toward the discharge direction, and of course propeller blades or blades of other shapes can also be used. The upper part of the molding machine housing is a loam cake 3, one end of the loam cake 3 is provided with a wet material inlet, and the lower part of the other end of the housing is provided with a product outlet. An air inlet for leading in dry air and an air outlet for discharging wet gas are also arranged on the casing. A jacket 5 is arranged on the shell, and a steam inlet and a condensed water outlet are arranged on the jacket 5 . The inner side of the jacket 5 forms a W-shaped groove body 1 adapted to the two hollow thermal shafts 2 .

In this embodiment, the transmission mechanism includes a rotary joint 9, a sprocket 10, a speed regulating device 8, a gear 7, a bearing and a stuffing box 4, and the rotary joint 9 is connected to a power device such as a motor.

The operation mode of the spiral rotary sludge drying molding machine is as follows: the saturated steam after the work of the steam turbine is used as the heating heat source, the pressure is 0.4-0.8MPa, and the temperature is 175°C. Saturated steam from the boiler enters the jacket 5 of the shell from the steam inlet, and enters the hollow heat shaft 2 and the wedge-shaped paddle 6 from the heat carrier inlet, and heats the fuselage, the hollow heat shaft 2 and the wedge-shaped paddle 6 at the same time to conduct The way of heating is to heat and dry the sludge. The dried wet sludge is quantitatively and continuously fed into the dryer from the wet material inlet. After the sludge enters the machine body, the sludge is turned over and stirred by the rotation of the wedge-shaped paddle 6, and the heating interface is continuously updated to fully integrate with the heated material. The fuselage is in contact with the wedge-shaped paddle 6 and is fully heated to evaporate the surface moisture contained in the sludge. At the same time, the sludge is transported to the product outlet with the rotation of the blade shaft, and the stirring is continued during the transport, so that the water seeping out of the sludge continues to evaporate. Finally, the evenly dried sludge is discharged from the product outlet. During this process, a small amount of flue gas from the boiler tail is introduced into the drying molding machine to take away the water vapor continuously generated during the sludge drying process. The flue gas enters from the air inlet and is discharged from the air outlet. After the saturated steam is heat-exchanged and condensed, it is discharged through the condensed water outlet for reuse.

The application of the equipment in this embodiment in the sludge briquette fuel incineration process is as follows:

Take the sludge briquette fuel incineration project with a processing capacity of 300 tons/day as an example: 300 tons/day of raw sludge (with a moisture content of 85%) is transported to the sludge incineration plant and stacked in a closed raw sludge storage bin. It is transported to the sludge drying plant through sludge pumps and pipelines. The sludge is dried by 2 sets of spiral rotary sludge dryers, and the wet sludge treatment capacity of each dryer is 150 tons/day. The sludge is dried to become granulated fuel with a water content of 30% and a particle size of 1-5 mm. The dried sludge is sent to the dry sludge bin through the belt. The sludge in the dry sludge bin and the coal in the dry coal shed are mixed and sent to the coal bunker in front of the furnace through the original coal conveying belt. The mixed fuel in the coal bunker in front of the furnace can be directly sent to the circulating fluidized bed for combustion or sent to the original coal mill of the power plant, and then enters the pulverized coal furnace for combustion through the pulverized coal burner.

Finally, it should be noted that the above-mentioned examples are only specific implementation examples of the present invention. Apparently, the utility model is not limited to the above examples, and there are many variations, including heat conduction oil, high-temperature air or flue gas as the drying heat source. All deformations that a person skilled in the art can derive or associate directly from the content disclosed in the utility model shall be considered as the protection scope of the utility model.

Claims (5)

1. A spiral rotary sludge drying molding machine, including a shell, characterized in that: at least one hollow thermal shaft connected to the transmission mechanism is installed inside the molding machine, and several hollow paddles are arranged on the hollow thermal shaft. The two ends of the shaft are respectively connected to the heat carrier inlet, and the middle part of the hollow heat shaft passes through the shell to lead out the heat carrier outlet; the upper part of one end of the shell is provided with a wet material inlet, and the lower part of the other end is provided with a product outlet; the shell is provided with a clamp A steam inlet and a condensate outlet are arranged on the jacket. 2. The sludge drying molding machine according to claim 1, characterized in that there are two hollow heat shafts. 3. The sludge drying and molding machine according to claim 1, characterized in that the paddle is wedge-shaped and installed obliquely on the hollow heat shaft. 4. The sludge drying molding machine according to claim 1, characterized in that, the blades are propeller blades. 5. The sludge drying and molding machine according to claim 1, characterized in that, an air inlet and an air outlet are also provided on the housing.

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