CN1308200C - A method of transporting coal slime with high-pressure pipeline - Google Patents

Abstract

A method for transporting highly viscous coal slime over long distances through pipelines. The present invention includes all or part of the following processes: crushing of coal slime → transport of coal slime → stirring and temporary storage of coal slime → positive pressure feeding of coal slime → piston pump pumping of coal slime → slag removal → switching of transport pipelines → transport of coal slime through pipelines → diversion of coal slime → branch pipe transport → boiler feeding → pipeline cleaning. The present method uses a hydraulically driven high-pressure piston pump to transport coal slime through a pipeline. It has the advantages of high conveying pressure, long conveying distance, a wide range of coal slime concentrations that can be transported, the ability to adjust the conveying volume locally or remotely and instantly according to the requirements of the boiler, the ability to communicate and control with related equipment, easy switching between the standby system and the common system, and the ability to achieve multi-point balanced feeding to the boiler and cleaning of the entire conveying pipeline without disassembly through a branch through a conveying pipeline.

Description

A method of transporting coal slime with high-pressure pipeline

Technical field

The invention relates to a method for transporting coal slime through a high-pressure pipeline, in particular to a pump with a piston structure capable of steplessly adjusting the delivery volume locally or remotely. Or a method of transporting coal slime to multiple feeding points.

Background technique

At present, the pipeline transportation of coal slime is carried out at a pressure lower than 3MPa through ordinary steel pipes by extrusion pumps. The conveying pressure is small, the concentration of coal slime is low, the conveying distance is short, the conveying volume is small, there is no function of adjusting the output in real time, and one conveying pipe cannot feed multiple feed points to the boiler at the same time, and the reliability is poor, and the operation and maintenance The cost is high, and it cannot meet the requirements of high concentration and long-distance transportation of coal slime in power plants, and it cannot automatically adjust the feeding amount of coal slime according to needs.

Contents of the invention

The invention provides a method for transporting high-concentration coal slime through long-distance pipelines for power plants. In this method, the coal slime is first stirred and pretreated to increase its pumpability, and then sent to a hydraulically driven high-pressure piston pump at a certain pressure, which is pumped out and delivered to the boiler through a high-pressure pipeline. According to different requirements of the boiler , the pumped slime can enter the boiler through one or more feeding points. The method has the advantages of high conveying pressure, long conveying distance, wide range of transportable slime concentration, in-situ or remote stepless real-time adjustment of conveying volume according to boiler requirements, easy switching between standby system and common system, and can pass through a conveying pipeline. The branch realizes the function of multi-point balanced feeding for the boiler and cleaning the entire conveying pipeline without disassembly.

The coal slime pipeline transportation method provided by the invention comprises the following operations:

(1) The crushing of coal slime, crushing and preliminary stirring of coal slime;

(2) Stirring and temporary storage of coal slime, further fully stir the coal slime and temporarily store a certain amount of coal slime;

(3) Positive pressure feeding. The positive pressure feeding equipment adopts a parallel double-rod spiral structure. The spiral can be made into a complete spiral or an incomplete spiral. The projection of the incomplete spiral blade on a plane perpendicular to the axis of the spiral is not a perfect circle;

(4) The piston pump pumps the coal slime, the piston pump pumps the coal slime to the delivery pipeline, the pumping pressure is greater than 3MPa, and the delivery volume of the coal slime can be adjusted steplessly from 0 to the rated amount;

(5) Switching of the conveying pipeline, switching the conveying pipeline so that it is connected with the common conveying system or the standby conveying system;

(6) The coal slime is transported to the boiler inlet through the pipeline;

(7) The diversion of the coal slime, the coal slime transported by the pipeline is divided into several branch pipelines through the diversion mechanism;

(8) Branch pipe transportation, coal slime is transported to each feeding port of the boiler through each branch pipe;

(9) Boiler feeding, the coal slime is sent into the boiler through the feeding device.

crafting process

According to the different characteristics and requirements of users, the present invention includes all or part of the following processes:

Coal slime crushing→coal slime transportation→coal slime mixing and temporary storage→coal slime positive pressure feeding→slag removal→piston pump pumping coal slime→conveying pipeline switching→coal slime transported through pipelines→coal slime diversion→ Branch pipe transportation→boiler feeding→pipeline cleaning.

Part or a single process in the above processes can be connected in parallel with a set of standby mechanisms.

The following is a further description of the role of each process:

1. Coal slime crushing: crush agglomerated coal slime or gangue, stones, wood blocks, etc., and also add a certain amount of water for preliminary mixing.

2. Stirring and temporary storage of coal slime: add a certain proportion of water to the coal slime and then fully stir it, and temporarily store a certain amount of coal slime.

3. Coal slime transportation: transport the crushed coal slime to the next process.

4. Supply slime to piston pump: supply slime to piston pump with proper pressure.

5. Coal slime pumping by piston pump: pump out the coal slime at a higher pressure (≥ 3Mpa).

6. Transmission pipeline switching: If there are two sets of equipment in the previous process, one for use and one for standby, the working part and the standby part can be switched through the transmission pipeline.

7. Pipeline transportation of coal slime: the pumped coal slime is transported to the boiler inlet through a high-pressure pipeline.

8. Diversion of coal slime: The coal slime is divided into multiple channels.

9. Branch pipe transportation: transport the coal slime to the feed point of each boiler.

10. Boiler feeding: Coal slime is sent into the boiler through the boiler feeding device.

11. Pipeline cleaning: clean up the coal slime in the conveying pipeline.

Process conditions

1. This method adopts a hydraulically driven high-pressure piston pump, the delivery volume can be adjusted steplessly in real time, and it has communication and joint control functions.

2. The positive pressure feeding equipment of the piston pump adopts a parallel double-rod screw structure, and the screw speed is steplessly adjustable. The screw can be made into a complete spiral or an incomplete spiral. The projection is not a perfect circle.

3. The transmission pipeline is made of high-pressure seamless steel pipe or a composite pipe lined with low-friction coefficient organic materials.

4. Through the reversing mechanism, the common system and the backup system can be switched to the same delivery pipeline, so as to realize the switching between the normal system and the backup system.

5. A conveying pipeline is divided into several branch pipelines through a diversion mechanism.

6. The coal slime can be transported to the boiler through the feeding mechanism, and it can also be switched to the cleaning position to clean the conveying pipeline, and the cleaning water will not enter the boiler.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a flow chart of the conveying process of three feeding ports of a single boiler of a single conveying system in the first embodiment of the method for conveying coal slime through high-pressure pipelines.

Fig. 2 is a flow chart of the conveying process of one boiler and three feed ports of a conveying system for one use and one spare for the second embodiment of the method for conveying coal slime through high-pressure pipelines.

Fig. 3 is a flow chart of the conveying process of two boilers and three feed ports of the dual-purpose and one-standby conveying system of the third embodiment of the method for conveying coal slime through high-pressure pipelines.

Fig. 4 is a schematic diagram of the composite pipe structure.

In the figure, the coal slime crushing process (1), coal slime mixing and temporary storage process (2), coal slime positive pressure feeding process (3), piston pump pumping process (4), slag removal process (5), pipeline reversing Process (6), high-pressure pipeline transport process (7), coal slime diversion process (8), branch pipe transport process (9), boiler feeding process (10), pipeline cleaning process (11), seamless steel pipe (12), Low-friction material lining (13).

In Figure 1, the coal slime crushing process (1), coal slime mixing and temporary storage process (2), coal slime positive pressure feeding process (3) piston pump pumping process (4) slag removal process (5) high pressure pipeline The conveying process (7), the coal slime diverting process (8), the branch pipe conveying process (9), the boiler feeding process (10), and the pipeline cleaning process (11) are connected in series to form a complete set of coal slime transporting process.

In Figure 2, the coal slime crushing process (1), coal slime mixing and temporary storage process (2), coal slime positive pressure feeding process (3), piston pump pumping process (4), and slag removal process (5) are connected in series into two parts of the conveying process, and these two sets of processes are connected in parallel through the conveying pipeline switching process (6) to form one for use and one for standby, and then combined with the high-pressure pipeline conveying process (7), coal slime diversion process (8), branch pipe conveying process (9), The boiler feeding process (10) and the pipeline cleaning process (11) are connected in series. The switching between the working part and the standby part can be realized through the transfer pipeline switching process (6).

In Figure 3, the coal slime crushing process (1), coal slime mixing and temporary storage process (2), coal slime positive pressure feeding process (3), piston pump pumping process (4), and slag removal process (5) are connected in series Three-part conveying process, two of which are used as the working part, and the other part is used as the spare part, and the two working parts are respectively connected in parallel with the spare part through the conveying pipeline switching process (6) to form dual-purpose and one standby, and then combined with the high-pressure pipeline conveying process (7) , slime diversion process (8), branch pipe conveying process (9), boiler feeding process (10), pipeline cleaning process (11) are connected in series, and the working part and the spare part can be realized through the conveying pipeline switching process (6) switch.

Fig. 2 is a structural schematic diagram of a composite pipe, a seamless steel pipe (12), and an organic material (13) with a friction coefficient of the lining.

Claims (3)

1. A coal slime pipeline transportation method, comprising the following steps: (1) The crushing of coal slime, crushing and preliminary stirring of coal slime; (2) Stirring and temporary storage of coal slime, further fully stir the coal slime and temporarily store a certain amount of coal slime; (3) Positive pressure feeding. The positive pressure feeding equipment adopts a parallel double-rod spiral structure. The spiral can be made into a complete spiral or an incomplete spiral. The projection of the incomplete spiral blade on a plane perpendicular to the axis of the spiral is not a perfect circle; (4) The piston pump pumps the coal slime, the piston pump pumps the coal slime to the delivery pipeline, the pumping pressure is greater than 3MPa, and the delivery volume of the coal slime can be adjusted steplessly from 0 to the rated amount; (5) Switching of the conveying pipeline, switching the conveying pipeline so that it is connected with the common conveying system or the standby conveying system; (6) The coal slime is transported to the boiler inlet through the pipeline; (7) The diversion of the coal slime, the coal slime transported by the pipeline is divided into several branch pipelines through the diversion mechanism; (8) Branch pipe transportation, coal slime is transported to each feeding port of the boiler through each branch pipe; (9) Boiler feeding, the coal slime is sent into the boiler through the feeding device. 2. The coal slime pipeline transportation method according to claim 1, characterized in that there is a slag removal process between the positive pressure feeding and the piston pump pumping the coal slime. 3. The coal slime pipeline conveying method according to claim 1 or 2, characterized in that the coal slime conveying system can be switched from the coal slime feeding state to the pipeline cleaning state or from the pipeline cleaning state to the coal slime pipeline conveying method through the boiler feeding mechanism. Mud feed status.

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