Coupled system and method for the separation and drying of moist fine particle coal

Abstract

A system for separation and drying of moist fine particle coal includes a blast blower, a surge tank, a moisture detection sensor, a control device and two pipelines, wherein the blast blower is communicated with the surge tank; one end of two pipelines which are connected in parallel is communicated with the surge tank, while the other end is communicated with a fluidized bed; a first pipeline includes a first valve, a first flowmeter, an air heater and an electric butterfly valve which are connected in series sequentially, while the second pipeline includes a second valve and a second flowmeter which are connected in series; the moisture detection sensor is arranged in the fluidized bed; and the control device is connected with the blast blower, the first valve, the first flowmeter, the air heater, the second valve, the second flowmeter and the moisture detection sensor.

Claims

1. A method for a coupled system of separation and drying of moist fine particle coal wherein the system comprises: at least two pipelines, wherein the first of the at least two pipelines consists of a No. 1 valve, a No. 1 flowmeter, an air heater and an electric butterfly valve which are connected in series sequentially, and the second of the at least two pipelines consists of a No. 2 valve and a No. 2 flowmeter which are connected in series; a blast blower communicated with a surge tank, wherein one end of each of the at least two pipelines is communicated with the surge tank and connected in parallel to the other of the at least two pipelines, while the other end of each of the at least two pipelines is communicated with a fluidized bed; a moisture detection sensor arranged in the fluidized bed; and a control device that is respectively connected with the blast blower, the No. 1 valve, the No. 1 flowmeter, the air heater, the No. 2 valve, the No. 2 flowmeter, the electric butterfly valve and the moisture detection sensor; wherein, the air heater is an electrical heating type; the method comprising the following steps: putting mined brown coal particles into the fluidized bed; detecting a moisture content on the surfaces of the brown coal particles in the fluidized bed in real time by the moisture detection sensor; transmitting the moisture content back to the control device; comparing a detected moisture content with a set moisture content with the control device, wherein if the detected moisture content exceeds the set moisture content, the control device will control the air heater and the blast blower to open, and at the same time, control the No. 1 valve and the electric butterfly valve to open, so that an air flow generated by the blast blower flows through the surge tank for pressure stabilizing, and then, the air flow is heated into a hot air flow by the air heater after passing through the No. 1 valve and the No. 1 flowmeter; generating the hot air flow pulsatingly after the hot air flow passes through the electric butterfly valve; conveying the hot air flow to the fluidized bed to dry the brown coal particles; providing real-time flow value feedback to the control device of the No. 1 flowmeter; controlling the fluidization number by controlling the opening degree of the No. 1 valve based on the set flow value with the control device; detecting the moisture content during the drying process on the surfaces of the brown coal particles in the fluidized bed in real time using the moisture detection sensor, if the detected moisture content is reduced to the set moisture content, the drying process will be completed; directing the air heater to stop operating during the process of separation and de-ashing via the control device while at the same time controlling the fluidization number of the pulsating air flow by controlling an aperture opening degree of the No. 1 valve; controlling the No. 2 valve to open via the control device and controlling the fluidization number with an aperture opening degree of the No. 2 valve via the flow value detected by the No. 2 flowmeter in real time; generating a second air flow by the blast blower that is divided into two paths after being subjected to pressure stabilizing by the surge tank, in one path, the pulsating air flow is generated via the No. 1 valve, the No. 1 flowmeter and the electric butterfly valve to be inputted to the fluidized bed, and in the other path, continuous air flow is generated by the No. 2 valve and the No. 2 flowmeter to enter the fluidized bed for the separation of the brown coal particles; and layering the brown coal particles in accordance with the density in the fluidized bed under a combined action of the pulsating air flow and the continuous air flow to complete the separation and de-ashing process of the brown coal particles.

2. The coupled method for the separation and drying of moist fine particle coal according to claim 1, wherein, in the drying process, the temperature of the hot air flow is 90 to 200 degree Celsius, air flow frequency is 0.5 to 8 Hz, and the fluidization number is 1.6 to 2.2.

3. The coupled method for the separation and drying of moist fine particle coal according to claim 1, wherein, in the separation process, the fluidization number of the continuous air flow is 0.6 to 1.0, the fluidization number of the pulsating air flow is 0.2 to 0.6, and the frequency is 0.5 to 8 Hz.

4. The coupled method for the separation and drying of moist fine particle coal according to claim 1, wherein, in the separation process, the temperature of the continuous air flow and the pulsating air flow is normal temperature.

5. The coupled method for the separation and drying of moist fine particle coal according to claim 1, wherein, the set moisture content on the surfaces of brown coal particles is 4%.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is the flow schematic diagram of the system in the invention;

(2) FIG. 2 is an electronics functional block diagram of the invention.

DETAILED DESCRIPTION

(3) Hereunder the present invention will be further detailed.

(4) As shown in the FIGS. 1 and 2, a coupled system for the separation and drying of moist fine particle coal, which comprises a blast blower, a surge tank, a moisture detection sensor, a control device and two pipelines, wherein the blast blower is communicated with the surge tank; one end of two pipelines which are connected in parallel is communicated with the surge tank, while the other end is communicated with a fluidized bed; one of the two pipelines consists of a No. 1 valve, a No. 1 flowmeter, an air heater and an electric butterfly valve which are connected in series sequentially, while the other pipeline consists of a No. 2 valve and a No. 2 flowmeter which are connected in series; the moisture detection sensor is arranged in the fluidized bed; and the control device is respectively connected with the blast blower, the No. 1 valve, the No. 1 flowmeter, the air heater, the No. 2 valve, the No. 2 flowmeter, the electric butterfly valve and the moisture detection sensor.

(5) Further, the air heater is an electrical heating type.

(6) A coupled method for the separation and drying of moist fine particle coal comprises the following steps:

(7) (1) the mined brown coal particles are put into the fluidized bed, and the moisture detection sensor detects the moisture content on the surfaces of the brown coal particles in the fluidized bed in real time and transmits it back to the control device;

(8) (2) the control device compares the detected moisture content with the set moisture content, if it exceeds the set moisture content, the control device will control the air heater and the blast blower to open, and at the same time, control the No. 1 valve and the electric butterfly valve to open, so that air flow generated by the blast blower flows through the surge tank for pressure stabilizing, and then, the air flow is heated into hot air flow by the air heater after passing through the No. 1 valve and the No. 1 flowmeter; after the hot air flow passes through the electric butterfly valve, pulsating hot air flow is generated and is conveyed to the fluidized bed for the drying of brown coal particles; and the No. 1 flowmeter feedbacks the real-time flow value to the control device, and the control device controls the fluidization number by controlling the opening degree of the No. 1 valve based on the set flow value;

(9) (3) in the drying process, the moisture detection sensor detects the moisture content on the surfaces of the brown coal particles in the fluidized bed in real time, and if the detected moisture content is reduced to the set moisture content, the drying process will be completed;

(10) (4) during the process of separation and de-ashing, the control device controls the air heater to stop operating, and at the same time, controls the fluidization number of the pulsating air flow by controlling the aperture opening degree of the No. 1 valve; in addition, the control device controls the No. 2 valve to open, and controls the fluidization number by controlling the aperture opening degree of the No. 2 valve via the flow value detected by the No. 2 flowmeter in real time; air flow generated by the blast blower is divided into two paths after being subjected to pressure stabilizing by the surge tank, in one path, the pulsating air flow is generated via the No. 1 valve, the No. 1 flowmeter and the electric butterfly valve to be inputted to the fluidized bed, and in the other path, continuous air flow is generated by the No. 2 valve and the No. 2 flowmeter to enter the fluidized bed for the separation of brown coal particles;

(11) (5) under the combined action of the pulsating air flow and the continuous air flow, brown coal particles are layered in accordance with the density in the fluidized bed to complete the separation and de-ashing process of brown coal particles, wherein the input of the continuous air flow can maintain the bed of fluidized bed having a certain expansion rate; and the pulsating air flow can introduce vibrating energy to reduce bubble size in the bed, enhance the uniform stability of bed density and enhance the layered separation of coal particles as per density, thereby achieving the separation and de-ashing process of brown coal particles under the combination of both air flows.

(12) Further, in the drying process, the temperature of the hot air flow is 90 to 200 degree Celsius, air flow frequency is 0.5 to 8 Hz, and the fluidization number is 1.6 to 2.2.

(13) Further, in the separation process, the fluidization number of the continuous air flow is 0.6 to 1.0, the fluidization number of the pulsating air flow is 0.2 to 0.6, and the frequency is 0.5 to 8 Hz.

(14) Further, in the separation process, the temperature of the continuous air flow and the pulsating air flow is normal temperature.

(15) Further, the set moisture content on the surfaces of brown coal particles is 4%.

(16) Although certain example methods and apparatus have been described herein, the scope of coverage of this patent is not limited thereto. On the contrary, this patent covers all methods, apparatus, and articles of manufacture fairly falling within the scope of the appended claims either literally or under the doctrine of equivalents.