阅读说明：本技术 一种气流磨的预热系统及其预热方法 (Preheating system and preheating method of jet mill ) 是由 谢毅霏 马晓峰 李润昌 张金鑫 王利刚 张�浩 于 2019-10-30 设计创作，主要内容包括：本发明公开了一种气流磨的预热系统及其预热方法,解决了现有技术采用蒸气对气流磨进行预热容易产生凝结水的问题。在气流磨(1)与粉尘收集装置(2)之间连接有收尘管路(3),在粉尘收集装置(2)上设置有收尘器空气加热循环管路(4),在收尘器空气加热循环管路(4)上设置有轴流风机(5)和空气加热器(6),在空气加热器(6)的输出端与气流磨(1)底端的排渣口之间连接有气流磨预热管路(11),在气流磨预热管路(11)上设置有第三阀门(12)。本发明结构简单、安装方便、容易控制,可靠性高。(The invention discloses a preheating system and a preheating method of an air flow mill, and solves the problem that condensation water is easily generated when steam is adopted to preheat the air flow mill in the prior art. A dust collecting pipeline (3) is connected between the jet mill (1) and the dust collecting device (2), a dust collector air heating circulating pipeline (4) is arranged on the dust collecting device (2), an axial flow fan (5) and an air heater (6) are arranged on the dust collector air heating circulating pipeline (4), a jet mill preheating pipeline (11) is connected between the output end of the air heater (6) and a slag discharging port at the bottom end of the jet mill (1), and a third valve (12) is arranged on the jet mill preheating pipeline (11). The invention has simple structure, convenient installation, easy control and high reliability.)

1. A preheating system of an airflow mill comprises the airflow mill (1) and a dust collecting device (2), a dust collecting pipeline (3) is connected between the airflow mill (1) and the dust collecting device (2), a dust collector air heating circulating pipeline (4) is arranged on the dust collecting device (2), a circulating heating air output end on the dust collecting device (2) is communicated with an input end of an axial flow fan (5) through a first valve (9), an output end of the axial flow fan (5) is communicated with an input end of an air heater (6), an output end of the air heater (6) is communicated with a circulating heating air input port on the dust collecting device (2) through a second valve (10), a slag discharging pipeline (7) is arranged on a slag discharging port at the bottom end of the airflow mill (1), and a slag discharging valve (8) is arranged on the slag discharging pipeline (7), the device is characterized in that an airflow mill preheating pipeline (11) is connected between the output end of the air heater (6) and the slag discharge pipeline (7), and a third valve (12) is arranged on the airflow mill preheating pipeline (11).

2. A method of preheating a preheating system of a jet mill as recited in claim 1, comprising the steps of:

firstly, before the airflow mill (1) is started, a second valve (10) and a slag discharge valve (8) are closed, a first valve (9) and a third valve (12) are opened, an axial flow fan (5) and an air heater (6) are started, air heated by the air heater (6) sequentially passes through an airflow mill preheating pipeline (11) and a slag discharge pipeline (7) to enter the airflow mill (1) to preheat the inner cavity of the airflow mill (1), and then the preheated air sequentially passes through a dust collection pipeline (3), a dust collection device (2), a circulating heating air output end on the dust collection device (2), the opened first valve (9) and the axial flow fan (5) to return to the air heater (6) to be heated again, so that the circulating heating of the air and the continuous preheating of the inner cavity of the airflow mill (1) are realized;

and secondly, when the temperature of the inner cavity of the jet mill (1) exceeds the steam dew point of the jet mill, closing the third valve (12), opening the second valve (10), and then starting the jet mill (1) to enable the jet mill system to be put into normal operation.

Technical Field

The invention relates to a preheating system of an air flow mill, in particular to a preheating system of an air flow mill and a preheating method thereof, which are suitable for the air flow mill for preparing superfine powdery materials by taking steam as power.

Background

At present, the preheating of the ultrafine powder jet mill generally adopts steam preheating; at the initial stage of starting the jet mill, as the internal temperature of the jet mill is lower than the dew point of steam, condensation water is inevitably generated inside the jet mill; if the condensed water is not discharged in time, the raw materials can be adhered to the inner wall of the jet mill after the raw materials are ground to form hardening, so that the normal production operation of equipment is influenced, and the quality of products can be directly influenced in serious cases; in the prior art, condensed water in the jet mill needs to be discharged, a slag discharging facility at the bottom of the jet mill needs to be dismantled, after the condensed water is discharged, the slag discharging facility at the bottom of the jet mill is installed, the operation process is time-consuming and labor-consuming, the process is complex, and the production efficiency is influenced.

Disclosure of Invention

The invention provides a preheating system and a preheating method of an air flow mill, and solves the technical problem that condensation water is easily generated when steam is adopted to preheat the air flow mill in the prior art.

The invention solves the technical problems by the following technical scheme:

the utility model provides a preheating system of air current mill, including air current mill and dust collection device, be connected with the pipeline that gathers dust between air current mill and dust collection device, be provided with dust collector air heating circulation pipeline on the dust collection device, the circulation heated air output on the dust collection device communicates with axial fan's input through first valve together, axial fan's output communicates with air heater's input together, air heater's output communicates with the circulation heated air input on the dust collection device through the second valve, be provided with the sediment pipeline on the row's cinder notch of air current mill bottom, be provided with the sediment valve on the sediment pipeline, be connected with air current mill preheating pipeline between air heater's output and sediment pipeline, be provided with the third valve on the air current mill preheating pipeline.

A preheating method of a preheating system of a jet mill comprises the following steps:

firstly, before the jet mill is started, closing a second valve and a slag discharge valve, opening a first valve and a third valve, starting an axial flow fan and an air heater, enabling air heated by the air heater to enter the jet mill through a jet mill preheating pipeline and a slag discharge pipeline in sequence, preheating an inner cavity of the jet mill, enabling the preheated air to return to the air heater through a dust collection pipeline, a dust collection device and a circulating heating air output end on the dust collection device, the opened first valve and the axial flow fan in sequence, and heating again to realize circulating heating of the air and continuous preheating of the inner cavity of the jet mill;

and secondly, when the temperature of the inner cavity of the jet mill exceeds the steam dew point of the jet mill, closing the third valve, opening the second valve, and then starting the jet mill to enable the jet mill system to be put into normal operation.

The invention effectively solves the problem that the existing steam jet mill is easy to generate condensed water in the preheating period; the invention has simple structure, convenient installation, easy control and high reliability.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Detailed Description

The invention is described in detail below with reference to the accompanying drawings:

a preheating system of an air flow mill comprises an air flow mill 1 and a dust collecting device 2, a dust collecting pipeline 3 is connected between the air flow mill 1 and the dust collecting device 2, the dust collecting device 2 is provided with a dust collector air heating circulation pipeline 4, the output end of the circulation heating air on the dust collecting device 2 is communicated with the input end of the axial flow fan 5 through a first valve 9, the output end of the axial flow fan 5 is communicated with the input end of the air heater 6, the output end of the air heater 6 is communicated with the circulation heating air input end on the dust collecting device 2 through a second valve 10, a slag discharge pipeline 7 is arranged on a slag discharge port at the bottom end of the jet mill 1, a slag discharge valve 8 is arranged on the slag discharge pipeline 7, an airflow mill preheating pipeline 11 is connected between the output end of the air heater 6 and the slag discharge pipeline 7, and a third valve 12 is arranged on the airflow mill preheating pipeline 11.

A preheating method of a preheating system of a jet mill comprises the following steps:

firstly, before the jet mill 1 is started, closing a second valve 10 and a slag discharge valve 8, opening a first valve 9 and a third valve 12, starting an axial flow fan 5 and an air heater 6, enabling air heated by the air heater 6 to enter the jet mill 1 through a jet mill preheating pipeline 11 and a slag discharge pipeline 7 in sequence, preheating an inner cavity of the jet mill 1, enabling the preheated air to return to the air heater 6 through a dust collection pipeline 3, a dust collection device 2, a circulating heating air output end on the dust collection device 2, the opened first valve 9 and the axial flow fan 5 in sequence, and heating again to realize circulating heating of the air and continuous preheating of the inner cavity of the jet mill 1;

and secondly, when the temperature of the inner cavity of the jet mill 1 exceeds the steam dew point of the jet mill, closing the third valve 12, opening the second valve 10, and then starting the jet mill 1 to enable the jet mill system to be put into normal operation.