Electricity-saving pulp mixing device for papermaking

Abstract

The utility model discloses an electricity-saving pulp mixing device for papermaking, which comprises a long-fiber pulp dispersing machine, the long-fiber pulp dispersing machine is sequentially connected with a long-fiber pulp temporary storage tank, a pipeline mixer and a pre-grinding tank through pipelines, and the pipeline mixer is further connected with an input pipeline of short-fiber wet pulp. Long fiber paper pulp and short fiber paper pulp are mixed through the pipeline mixer and then enter the pre-grinding groove. According to the utility model, only the long-fiber paper pulp is dispersed, the short-fiber wet pulp is directly used, the long-fiber paper pulp and the short-fiber paper pulp are proportionally mixed in the pipeline mixer and enter the pre-grinding groove to wait for grinding, so that electricity is saved.

Description

Technical Field

[0001] The utility model relates to a papermaking device, in particular to a power-saving pulp mixing device for papermaking. Background Art

[0002] In the papermaking industry, pulp, as the core raw material, its properties and processing methods have a crucial impact on the quality of the final paper product and the energy consumption during the production process. Pulp is mainly divided into two categories: long-fiber pulp and short-fiber pulp. They have significant differences in fiber length, strength, softness, etc. Therefore, during the production process of paperboard, according to the product requirements, these two types of pulp often need to be mixed in a certain proportion to obtain ideal paper properties. Since the fibers of long-fiber pulp are longer and intertwined complexly, while short-fiber pulp is relatively finer and more fragmented, it is difficult for the two to quickly reach a uniform dispersion state when mixed. To achieve a good mixing effect, usually, an efficient mixing device is required, and through long-time stirring or strong shearing action, the entanglement between fibers is broken, so that long fibers and short fibers are fully intertwined.

[0003] Currently, long fibers and short fibers are added to the pulper together for pulping and pulp supply, and then input into the pre-grinding tank. However, there are problems such as concentration fluctuations and increased power consumption in the mixed pulp. Especially when dealing with a large amount of pulp, the energy consumption of the mixing device increases significantly, becoming an important part of the production cost of papermaking enterprises. Content of the Utility Model

[0004] Purpose of the Utility Model: The purpose of the utility model is to provide a power-saving pulp mixing device for papermaking with long-fiber pulp and short-fiber pulp.

[0005] Technical Solution: The power-saving pulp mixing device for papermaking described in the utility model includes a long-fiber pulper. The long-fiber pulper is sequentially connected to a long-fiber pulp storage tank, a pipe mixer, and a pre-grinding tank through pipelines. The pipe mixer is also connected to the input pipeline of short-fiber wet pulp. The long-fiber pulp and the short-fiber pulp are mixed by the pipe mixer and then enter the pre-grinding tank.

[0006] Further, flow meters and control valves are provided on all pipelines.

[0007] Preferably, pulp stirring devices are provided in both the long-fiber pulp storage tank and the pre-grinding tank to improve the stability of the pulp concentration in the tank.

[0008] Further, the length of the pipe mixer is 1.48 m - 2 m, and the inner diameter is 0.3 m - 0.45 m.

[0009] Further, the inner diameter of the discharge pipe of the pipe mixer is 0.25 m - 3 m.

[0010] Preferably, the pipeline flow rate of the input pipeline of the short fiber wet pulp is 3000 - 3500 L / min, and the pipeline flow rate from the long fiber pulp storage tank to the pipeline mixer is 1000 - 1500 L / min.

[0011] Furthermore, it also includes a PLC controller. The flowmeter and control valve are electrically connected to the PLC controller to control the proportion of long fiber pulp and short fiber pulp in the pipeline mixer.

[0012] Beneficial effects: Compared with the prior art, the present utility model has the following advantages: 1. The present utility model only performs defibering treatment on long fiber pulp and directly uses short fiber wet pulp. The long fiber pulp and short fiber pulp are proportionally mixed in the pipeline mixer and then enter the pre-grinding tank to wait for grinding, achieving power saving; 2. In this embodiment, the PLC controller is used to control the pulp feeding flow rate in the pipeline, and pulp stirring devices are provided in both the long fiber pulp storage tank and the pre-grinding tank to further stabilize the concentration of the mixed pulp. Description of the Drawings

[0013] Figure 1 It is a structural schematic diagram of the present utility model. Detailed Embodiment

[0014] The technical solution of the present utility model will be further described below in conjunction with the drawings.

[0015] The power-saving pulp mixing device for papermaking described in the present utility model includes a long fiber defibering machine 1 and a PLC controller. The long fiber defibering machine 1 is sequentially connected to a long fiber pulp storage tank 2, a pipeline mixer 3, and a pre-grinding tank 4 through pipelines. The pipeline mixer 3 is also connected to an input pipeline 5 of short fiber wet pulp. The long fiber pulp and short fiber pulp are mixed in the pipeline mixer 3 and then enter the pre-grinding tank. Flowmeters and control valves are provided on all pipelines. The flowmeters and control valves are electrically connected to the PLC controller to enable the long fiber pulp and short fiber pulp to enter the pipeline mixer 3 for mixing at a set proportion and then enter the pre-grinding tank 4, realizing the mixed pulp supply of long fiber pulp and short fiber pulp, meeting the production requirements of the paper machine, and at the same time solving problems such as concentration fluctuations and increased power consumption in mixed defibering. Preferably, pulp stirring devices are provided in both the long fiber pulp storage tank 2 and the pre-grinding tank 4. The length of the pipeline mixer is 1.48 m, the diameter is 0.45 m, and the diameter of the discharge pipe is 0.25 m. Furthermore, the pipeline flow rate of the input pipeline of the short fiber wet pulp is 3000 - 3500 L / min, and the pipeline flow rate from the long fiber pulp storage tank to the pipeline mixer is 1000 - 1500 L / min.

[0016] Comparative Example

[0017] Defibering machine motor (315 KW / H), for each tank of defibered pulp: 2 tons, defibering time: 8 minutes, defibering motor load: 50%

[0018] The long fiber slurry and the short fiber slurry are mixed and supplied as loose slurry. The daily loose slurry volume of one line is 200 tons. 200 tons / 2 tons = 100 tanks (per day). 100 * 8 (loose slurry time per tank) = 800 minutes / 60 = 13.3 hours. 13.3 * 315 * 0.5 = 2095 KW (daily power consumption)

[0019] The concentration fluctuation of the mixed long fiber and short fiber loose slurry of 3% - 5% affects the process stability.

[0020] Example

[0021] The daily slurry supply of one line is 200 tons * 20% = 40 tons (per day). 40 tons / 2 tons = 20 tanks per day. 20 tanks * 8 (loose slurry time per tank) = 160 minutes / 60 = 2.67 hours. 2.67 * 315 * 0.5 = 421 KW (daily power consumption)

[0022] Compared with the comparative example, the daily power consumption of this example can be saved by 1674 KW.

[0023] The concentration of the mixed long fiber and short fiber loose slurry is stably controlled at 4% - 4.5%. The optimal requirement is a fluctuation of around 4.5%.

Claims

1. An energy-saving pulp mixing device for papermaking, characterized in that: The invention comprises a long fiber pulping machine (1), wherein the long fiber pulping machine (1) is connected in sequence to a long fiber pulp temporary storage tank (2), a pipeline mixer (3) and a pre-grinding tank (4) through pipelines, wherein the pipeline mixer (3) is also connected to an input pipeline (5) for short fiber wet pulp, and the long fiber pulp and the short fiber pulp are mixed through the pipeline mixer (3) and then enter the pre-grinding tank (4).

2. The power-saving pulp mixing device for papermaking according to claim 1, characterized in that: Flow meters and control valves are installed on the pipelines.

3. The power-saving pulp mixing device for papermaking according to claim 2, characterized in that: The long-fiber pulp temporary storage tank (2) and the pre-grinding tank (4) are both provided with pulp stirring devices.

4. The power-saving pulp mixing device for papermaking according to claim 1, characterized in that: The length of the pipeline mixer (3) is 1.48m-2m, and the diameter is 0.3m-0.45m.

5. The power-saving pulp mixing device for papermaking according to claim 1, characterized in that: The diameter of the discharge pipe of the pipeline mixer (3) is 0.25m-3m.

6. The power-saving pulp mixing device for papermaking according to claim 2, characterized in that: The pipeline flow rate of the input pipeline (5) for the short fiber wet pulp is 3000-3500 L / min, and the pipeline flow rate from the long fiber pulp temporary storage tank to the pipeline mixer is 1000-1500 L / min.

7. The power-saving pulp mixing device for papermaking according to claim 2, characterized in that: It also includes a PLC controller, and the flow meter and the control valve are electrically connected to the PLC controller.

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