CN216862468U

CN216862468U - Novel automatic bridge breaking device with coal powder lock hopper sequential control function

Info

Publication number: CN216862468U
Application number: CN202122432969.4U
Authority: CN
Inventors: 张鹏; 宋太浩; 胜兆泉; 刘红宇
Original assignee: Henan Province Zhongyuan Dahua Group Co ltd
Current assignee: Henan Province Zhongyuan Dahua Group Co ltd
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2022-07-01
Anticipated expiration: 2031-10-11

Abstract

A novel coal powder lock hopper sequential control automatic bridge breaking device is a technology for effectively breaking a bridge after coal powder is bridged in the production process of the coal chemical industry, is used for making up the single defect of a conventional mode of pressing down to break the bridge and eliminating the operation risk of manually breaking the bridge by personnel, and has the structural relationship that the lower part of a coal powder lock hopper is a lock hopper bottom cone, and a lock hopper low material level detection switch is arranged in the middle of the coal powder lock hopper; the top end of the pulverized coal lock hopper is connected with a pressure relief pipe, and the pressure relief pipe is respectively provided with a lock hopper pressure relief cut-off valve and a lock hopper pressure relief regulating valve; the external part of the bottom end of a coal powder lock hopper is connected with a pipeline aerator, the pipeline aerator is connected with the middle of a coal powder buffer tank through a lock hopper discharging pipeline, a lock hopper discharging upper cutting valve and a lock hopper discharging lower cutting valve are sequentially connected to the lock hopper discharging pipeline from top to bottom, and a high material level detection switch is mounted on the coal powder buffer tank; one side of the pipeline aerator is connected with an aeration pipeline, and a nitrogen shut-off valve of the pipeline aerator is arranged on the aeration pipeline.

Description

Novel automatic bridge breaking device with coal powder lock hopper sequential control function

Technical Field

The utility model relates to a technology for effectively breaking a bridge after coal powder is bridged in the production process of the coal chemical industry, in particular to a novel coal powder lock hopper sequential control automatic bridge breaking device.

Background

In the process and equipment of pulverized coal in chemical and power generation industries, a lock hopper device is commonly used when the pulverized coal, ash, slag and other solid materials need to be conveyed in a variable pressure manner. Under the influence of material granularity, humidity and detention time, the lock hopper blanking process often generates a bridge bridging phenomenon, and the conventional automatic bridge breaking program design concept is to pressurize the lock hopper bottom cone, the flute pipe and the pipeline aerator and break the bridge by means of a pressure difference downward-pressing conveying mode. The conventional mode usually needs to be successful through multiple times of bridge breaking, time is delayed, nitrogen is wasted, particularly for the bridge bridging condition between a pipeline aerator and a blanking valve, the conventional bridge breaking mode can cause further compaction of solid materials, and the effect is poor. After the conventional automatic bridge breaking method is invalid, an operator is inevitably required to manually break the bridge, so that the burden of the operator is increased, and certain operation risk is brought. And the problem of bridging of the lock hopper can be effectively solved by finding the mode of 'pushing up and breaking the bridge' of the pressure relief airflow of the lock hopper during manual 'bridge breaking'. At present, the automatic 'bridge breaking' process sequence control concept of the lock hopper equipment still stays in the traditional lock hopper pressurization 'bridge breaking' mode.

Disclosure of Invention

The utility model aims to provide a novel safe and efficient coal powder lock hopper sequential control automatic bridge breaking device which is used for making up the single defect of the conventional 'bridge breaking by pressing down', meanwhile, the utility model eliminates the operational risk of manual bridge breaking of personnel, and the utility model aims to realize the method, which comprises a coal powder lock hopper, a pressure-charging flute pipe in the lock hopper, a lock hopper bottom cone, a pipeline aerator, a coal powder buffer tank, a nitrogen stop valve, a nitrogen flow regulating valve, a bottom cone nitrogen stop valve, a pipeline aerator nitrogen stop valve, a balance pipeline, an upper cut-off valve, a lower cut-off valve, a lock hopper pressure-discharging regulating valve, a lock hopper discharge upper cut-off valve, a lock hopper discharge lower cut-off valve, a lock hopper low material level detection switch, a high material level detection switch, a coal powder buffer pipe and lock hopper differential pressure measurement instrument, and a flute pipe nitrogen flowmeter, the lower part of the coal powder lock hopper is a lock hopper bottom cone, and the middle of the coal powder lock hopper is provided with a lock hopper low material level detection switch; the top end of the pulverized coal lock hopper is connected with a pressure relief pipe, and the pressure relief pipe is respectively provided with a lock hopper pressure relief cut-off valve and a lock hopper pressure relief regulating valve; the external part of the bottom end of a coal powder lock hopper is connected with a pipeline aerator, the pipeline aerator is connected with the middle of a coal powder buffer tank through a lock hopper discharging pipeline, a lock hopper discharging upper cutting valve and a lock hopper discharging lower cutting valve are sequentially connected to the lock hopper discharging pipeline from top to bottom, and a high material level detection switch is mounted on the coal powder buffer tank; one side of the pipeline aerator is connected with an aeration pipeline, and a nitrogen shut-off valve of the pipeline aerator is arranged on the aeration pipeline.

The upper part of the lock hopper bottom cone is provided with a lock hopper internal filling flute pipe; a nitrogen charging pipeline is connected to a charging flute pipe in the lock hopper, a nitrogen stop valve and a nitrogen flow regulating valve are sequentially connected to the nitrogen charging pipeline, and a flute pipe nitrogen flowmeter is arranged between the nitrogen stop valve and the nitrogen flow regulating valve; a bottom cone nitrogen stop valve is arranged between the nitrogen pressurizing pipeline and the lock hopper bottom cone.

In the embodiment 3, the top end of the coal powder lock hopper is connected with the middle of the coal powder buffer tank through a balance pipeline, and an upper cut-off valve and a lower cut-off valve are sequentially arranged in the middle of the balance pipeline from top to bottom; the upper and lower balance pipelines externally connected with the upper and lower cut-off valves are connected with a pipeline, and a pulverized coal buffer tube and a lock bucket differential pressure measuring instrument are arranged on the pipeline.

The device is used for manually starting the 'top-up bridge-breaking' program by an operator and can be provided with a 'top-up bridge-breaking' button. The button can be set as an external electronic mechanical button or a built-in HMI panel soft button.

The application method of the utility model comprises the following steps: when the bridging phenomenon of the pulverized coal bucket locking equipment during blanking is judged, the sequence control program skips to preferentially execute a top-pushing bridge-breaking program, and a bottom-pressing bridge-breaking program is selected according to the bridge-breaking effect; after the bridge breaking program is executed, whether bridge breaking is successful or not is judged by detecting a lock hopper low material level detection switch, if yes, the normal blanking program is directly returned, and a subsequent bridge breaking program is not executed; if the operation of one-time 'bridge breaking' is unsuccessful, the bridge breaking differential pressure is automatically increased by 50kpa on the basis of the original setting, and the 'top-up bridge breaking' is carried out for the second time; the program is set with the maximum execution times of 'top-up bridge breaking', and the 'bridge breaking' can not be successful after reaching the upper limit, then an alarm is sent to be converted into manual operation, and the judgment of an operator is converted into execution of 'bottom-up bridge breaking' program or manual operation; according to the load capacity of the device and the design parameters of the equipment, the frequency high-limit protection of 'top-lifting bridge-breaking' and the 'bridge-breaking pressure difference' are set, the program is set with the initial frequency of 'top-lifting bridge-breaking' and the initial 'bridge-breaking pressure difference', and the process can modify the set values of the frequency of 'top-lifting bridge-breaking' and the 'bridge-breaking pressure difference' according to the running condition.

The normal blanking timing of the coal powder lock hopper is overtime or the automatic program start of the top-loading bridge-breaking can be triggered by manually triggering a top-loading bridge-breaking button by an operator; specifically, the normal lock hopper blanking program enters the automatic program design of 'top-up bridge breaking': the method comprises the following steps that 1, if the normal lock hopper blanking timing is reached and a lock hopper low material level detection switch is not monitored, an 'top-up bridge breaking' program is automatically started; and 2, under the condition that the normal coal powder lock hopper is not fed for a while, and the lock hopper low material level detection switch is not monitored, an operator enters an upper top bridge breaking program by triggering an upper top bridge breaking button. And if the conditions 1 and 2 are satisfied arbitrarily, an automatic program of 'top-up bridge breaking' can be entered.

Executing the program design of 'top-up bridge breaking' sequential control: step one, closing an upper cut-off valve of a lock hopper discharging and an upper cut-off valve of a balance pipeline by a program; secondly, after the upper cutting valve of the discharging of the lock hopper and the upper cutting valve of the balance pipeline are detected to be closed, the program opens the pressure relief cut-off valve of the lock hopper; after the situation that the lock bucket pressure relief cut-off valve is opened is monitored, a certain initial valve position x% of the lock bucket pressure relief regulating valve is set by a program, the lock bucket pressure relief regulating valve is opened and put into operation automatically, and the set value is a broken bridge pressure difference; thirdly, after the coal powder buffer tank and lock hopper pressure difference measuring instrument 19 is monitored to be larger than a set value of bridge-breaking pressure difference, closing the lock hopper pressure-relief cut-off valve and the lock hopper pressure-relief regulating valve by a program; fourthly, after the lock bucket pressure relief cut-off valve is monitored to be closed, the program opens an upper cut-off valve of the lock bucket discharging and an upper cut-off valve of the balance pipeline, and starts an 'upper top bridge breaking discharging timer'; step five, condition 1: if the condition that the lock hopper low material level detection switch is triggered is monitored, a bridge breaking procedure is carried out, wherein the bridge breaking procedure represents that the bridge breaking is successful; condition 2: if the bridge breaking blanking timing is finished, the bridge breaking count is less than 2, and meanwhile, a lock hopper low material level detection switch is not triggered, the bridge breaking count is increased by 1, the bridge breaking differential pressure is increased by 50kpa, and after the bridge lifting blanking timer is reset, the bridge breaking step is carried out again; condition 3: if the bridge breaking blanking timing is finished, the bridge breaking count is not less than or equal to 2, and the lock hopper low material level detection switch is not triggered, an alarm is sent, and after manual processing by an operator, the bridge breaking by pushing up can be continuously executed or the bridge breaking by pressing down can be continuously executed.

A given lock hopper pressure relief regulating valve has a certain initial valve position x%, and can be modified according to the valve characteristics and the size of the lock hopper; bridge breaking pressure difference = bridge breaking primary pressure difference + (bridge breaking times and pressure difference increasing value); the initial pressure difference (default 100 kpa) and the pressure difference increase value (default 50 kpa) of the broken bridge can be modified by process personnel, and the upper limit protection limitation is carried out on the broken bridge pressure difference according to the equipment safety; the upper limit of the times of executing the automatic bridge breaking can be modified, but the program execution period and the material level of downstream equipment need to be considered; after jumping out of the upper top bridge breaking sequence control, the upper top bridge breaking blanking timer needs to be reset, and the bridge breaking counting counter is reset to be 0.

The significance of the utility model is as follows: 1. the defect that a conventional bridge breaking mode is single is overcome, and a lock hopper pressure relief type bridge breaking process is added; 2. the bottleneck problem that the conventional bridge breaking mode can aggravate material compaction and is not suitable for successful bridge breaking when the bridge is built between the bottom of the lock hopper and the blanking valve is solved; 3. the pressure relief type bridge breaking operation method forms an automatic sequential control bridge breaking procedure, so that the operation is convenient and fast; 4. the operation risk of manually relieving pressure to break the bridge by operators is eliminated; 5. the 'bridge breaking' method is suitable for coal powder locking hoppers and other solid material locking hoppers with similar conditions; 6. it can be directly applied to the design of new devices and the technical transformation of old devices; 7. no equipment investment is required to be increased; 8. the design of changeable 'bridge breaking' times and 'bridge breaking' pressure difference can pertinently solve the problem of different coal powder 'bridge building' severity, so that an operator can determine the next 'bridge breaking' degree according to the 'bridge breaking' effect last time, the treatment time is shortened to the maximum degree, and nitrogen is saved, therefore, the method is a solution without investment and with quick effect.

Drawings

Fig. 1 is a schematic structural diagram of a novel sequential control automatic bridge breaker of a pulverized coal lock bucket, wherein 1 is a pulverized coal lock bucket 2, a pressure filling flute pipe 3 in the lock bucket, a lock bucket bottom cone 4, a pipeline aerator 5, a pulverized coal buffer tank 6, a nitrogen shut-off valve 7, a nitrogen flow regulating valve 8, a bottom cone nitrogen shut-off valve 9, a pipeline aerator nitrogen shut-off valve 10, a balance pipeline 11, an upper cut-off valve 12, a lower cut-off valve 13, a lock bucket pressure relief shut-off valve 14, a lock bucket pressure relief regulating valve 15, a lock bucket discharging upper cut-off valve 16, a lock bucket discharging lower cut-off valve 17, a lock bucket low material level detection switch 18, a high material level detection switch 19, a pulverized coal buffer pipe and lock bucket differential pressure measurement instrument 20 and a flute pipe nitrogen flow meter.

Detailed Description

The device comprises a coal powder lock hopper 1, a pressure filling flute pipe 2 in the lock hopper, a lock hopper bottom cone 3, a pipeline aerator 4, a coal powder buffer tank 5, a nitrogen stop valve 6, a nitrogen flow regulating valve 7, a bottom cone nitrogen stop valve 8, a pipeline aerator nitrogen stop valve 9, a balance pipeline 10, an upper cut-off valve 11, a lower cut-off valve 12, a lock hopper pressure relief cut-off valve 13, a lock hopper pressure relief regulating valve 14, a lock hopper discharging upper cut-off valve 15, a lock hopper discharging lower cut-off valve 16, a lock hopper low material level detection switch 17, a high material level detection switch 18, a coal powder buffer pipe and lock hopper differential pressure measurement instrument 19 and a flute pipe nitrogen flowmeter 20, wherein the lower part of the coal powder lock hopper 1 is provided with the lock hopper bottom cone 3, and the middle part of the coal powder lock hopper 1 is provided with the lock hopper low material level detection switch 17; the top end of a pulverized coal lock hopper 1 is connected with a pressure relief pipe, and a lock hopper pressure relief cut-off valve 13 and a lock hopper pressure relief regulating valve 14 are respectively arranged on the pressure relief pipe; the external part of the bottom end of a coal powder lock hopper 1 is connected with a pipeline aerator 4, the middle of the pipeline aerator 4 and a coal powder buffer tank 5 is connected by a lock hopper discharging pipeline, a lock hopper discharging upper cut-off valve 15 and a lock hopper discharging lower cut-off valve 16 are sequentially connected on the lock hopper discharging pipeline from top to bottom, and a high material level detection switch 18 is arranged on the coal powder buffer tank 5; one side of the pipeline aerator 4 is connected with an aeration pipeline, and a pipeline aerator nitrogen shut-off valve 9 is installed on the aeration pipeline.

In the embodiment 2, the upper part of the lock hopper bottom cone 3 is provided with a lock hopper internal pressurizing flute pipe 2; a nitrogen charging pipeline is connected to a charging flute pipe 2 in the lock hopper, a nitrogen cut-off valve 6 and a nitrogen flow regulating valve 7 are sequentially connected to the nitrogen charging pipeline, and a flute pipe nitrogen flowmeter 20 is arranged between the nitrogen cut-off valve 6 and the nitrogen flow regulating valve 7; a bottom cone nitrogen cut-off valve 8 is arranged between the nitrogen pressurizing pipeline and the lock hopper bottom cone 3.

In embodiment 3, the top end of the pulverized coal lock hopper 1 is connected with the middle of the pulverized coal buffer tank 5 through a balance pipeline 10, and an upper cut-off valve 11 and a lower cut-off valve 12 are sequentially arranged in the middle of the balance pipeline 10 from top to bottom; the upper and lower balance pipelines 10 externally connected with the upper and lower cut-off valves are connected with a pipeline, and a pulverized coal buffer tube and a lock bucket differential pressure measuring instrument 19 are arranged on the pipeline.

Claims

1. The utility model provides a novel buggy lock fill is in same direction as automatic bridge breaker of accuse device, it includes buggy lock fill (1), pressurize flute pipe (2) in the lock fill, lock fill base cone (3), pipeline aerator (4), buggy buffer tank (5), nitrogen gas trip valve (6), nitrogen gas flow control valve (7), base cone nitrogen gas trip valve (8), pipeline nitrogen gas trip valve (9), balanced pipeline (10), go up cut-off valve (11), lower cut-off valve (12), lock fill pressure release trip valve (13), lock fill pressure release governing valve (14), cut-off valve (15) on the lock fill blowing, lock fill blowing lower cut-off valve (16), lock fill low material level detect switch (17), high material level detect switch (18), buggy and lock fill differential pressure measuring instrument (19), flute pipe nitrogen gas flowmeter (20), characterized by: the lower part of the coal powder lock hopper (1) is provided with a lock hopper bottom cone (3), and the middle of the coal powder lock hopper (1) is provided with a lock hopper low material level detection switch (17); the top end of a pulverized coal lock hopper (1) is connected with a pressure relief pipe, and a lock hopper pressure relief cut-off valve (13) and a lock hopper pressure relief regulating valve (14) are respectively arranged on the pressure relief pipe; the external part of the bottom end of a coal powder lock hopper (1) is connected with a pipeline aerator (4), the middle of the pipeline aerator (4) and a coal powder buffer tank (5) is connected by a lock hopper discharging pipeline, a lock hopper discharging upper cut-off valve (15) and a lock hopper discharging lower cut-off valve (16) are sequentially connected on the lock hopper discharging pipeline from top to bottom, and a high material level detection switch (18) is installed on the coal powder buffer tank (5); one side of the pipeline aerator (4) is connected with an aeration pipeline, and a pipeline aerator nitrogen shut-off valve (9) is arranged on the aeration pipeline.

2. The novel pulverized coal lock-bucket sequential control automatic bridge breaking device as claimed in claim 1, which is characterized in that: the upper part of the lock hopper bottom cone (3) is provided with a lock hopper internal filling flute pipe (2); a nitrogen charging pipeline is connected to a charging flute pipe (2) in the lock hopper, a nitrogen stop valve (6) and a nitrogen flow regulating valve (7) are sequentially connected to the nitrogen charging pipeline, and a flute pipe nitrogen flowmeter (20) is arranged between the nitrogen stop valve (6) and the nitrogen flow regulating valve (7); a bottom cone nitrogen stop valve (8) is arranged between the nitrogen pressurizing pipeline and the lock hopper bottom cone (3).

3. The novel pulverized coal lock-bucket sequential control automatic bridge breaking device as claimed in claim 1, which is characterized in that: the top end of the coal dust lock hopper (1) is connected with the middle of the coal dust buffer tank (5) through a balance pipeline (10), and an upper cut-off valve (11) and a lower cut-off valve (12) are sequentially arranged in the middle of the balance pipeline (10) from top to bottom; an upper balance pipeline (10) and a lower balance pipeline (10) which are externally connected with the upper cut-off valve and the lower cut-off valve are connected with a pipeline, and a coal powder buffer tube and a lock bucket differential pressure measuring instrument (19) are arranged on the pipeline.