Double-chamber kiln pulverized coal injection device capable of accurately controlling injection quantity

Abstract

The utility model discloses a double-hearth kiln pulverized coal injection device capable of accurately controlling injection quantity, which comprises a tank body, two metering and feeding components are arranged at the bottom of the tank body, each metering and feeding component comprises a metering unit and a feeder, the output end of each feeder is provided with two branches, and the two branches are respectively connected with the metering unit and the feeder. The two branches are respectively a kiln chamber pipeline A and a kiln chamber pipeline B, distributors are arranged at the tail ends of the kiln chamber pipeline A and the kiln chamber pipeline B, and the distributors are connected with branch flow regulating valves; according to the device, the injection tank is filled with pulverized coal by means of gravity, each feeder is connected with a main injection pipeline, a main pipe is divided into two paths, the main pipe can selectively enter a hearth A or a hearth B of a double-hearth kiln, each branch corresponds to a pulverized coal distributor, the pulverized coal is injected to 33 pulverized coal spray guns corresponding to one kiln hearth through the distributors, and the pulverized coal is injected to the pulverized coal spray guns corresponding to the other kiln hearth. A flow control valve is arranged behind the distributor, the opening degree of the valve can be adjusted, secondary adjustment of the pulverized coal amount of each spray gun is achieved, and therefore the purpose of optimizing calcination is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of limestone calcination, in particular to a double-hearth kiln coal powder injection device for precisely controlling injection amount. BACKGROUND

[0002] The double-hearth lime kiln adopts a structure in which two kiln hearths are connected, and a connecting channel can be used for heat exchange between the two kiln hearths. One kiln hearth is used for calcination, and the other kiln hearth is used for heat storage, and the calcination of lime is alternately performed. The double-hearth lime kiln is more energy-saving, and such kiln types are increasingly built in the market.

[0003] Each double-hearth kiln has two kiln hearths, and each kiln hearth has 33 coal injection ports. The double-hearth kiln uses fluid fuel, such as coal gas, oil, coal powder, etc. The device is suitable for a double-hearth kiln using coal powder as fuel. The combustion-supporting air of the double-hearth kiln is sent from the top of one kiln hearth by a Roots blower, and the combustion-supporting air is preheated in a preheating zone before being mixed with the fuel. Then, the combustion flame gas flow passes through a calcination zone to calcine the limestone. The exhaust gas of the combustion in this kiln hearth enters the other kiln hearth through the bottom channel to preheat the limestone in the other kiln hearth. The traditional coal powder injection is mainly composed of a coal powder bin, a feeder, a screw scale, and a coal powder injection device. The injection amount is controlled by adjusting the size of the air volume. The disadvantages of this process are that the injection amount is uneven, and it is difficult to achieve weighing control. The original process distributor is uniformly distributed, and it is unable to achieve the function of reducing the coal injection amount for some of the 33 injection guns, which is not conducive to precisely controlling the combustion in the kiln. Therefore, a double-hearth kiln coal powder injection device for precisely controlling injection amount is needed to solve the above problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a double-hearth kiln coal powder injection device for precisely controlling injection amount to solve the above problems in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A double-hearth kiln coal powder injection device for precisely controlling injection amount, comprising a tank body, two metering and feeding assemblies are arranged at the bottom of the tank body, the metering and feeding assembly comprises a metering unit and a feeder, the feeder is arranged at the discharge end of the metering unit, the output ends of the two feeders are both provided with two branches, the two branches are respectively an A kiln hearth pipeline and a B kiln hearth pipeline, the ends of the A kiln hearth pipeline and the B kiln hearth pipeline are both provided with a distributor, and the distributor is connected with a branch flow regulating valve.

[0007] Preferably, the A kiln hearth pipeline and the B kiln hearth pipeline are both provided with an explosion-proof switching valve, which can realize separate distribution of the coal powder to the A kiln hearth pipeline and the B kiln hearth pipeline, and the coal powder is injected out by the branch flow regulating valve through the distributor.

[0008] Preferably, the branch flow regulating valve is provided with a scale, and the scale is a full flow interface, which is a minimum flow section.

[0009] Preferably, the device further comprises a manual maintenance gate valve, a partition valve, a flexible joint and a pulverized coal injection tank inlet valve, the pulverized coal injection tank inlet valve is arranged at the top of the tank body, and the manual maintenance gate valve, the partition valve, the flexible joint and the pulverized coal injection tank inlet valve are sequentially connected from top to bottom.

[0010] Preferably, the inside of the tank body is provided with a weighing sensor, and the weighing sensor is connected with a pulverized coal distributor.

[0011] Preferably, the weighing sensor is further provided with a flow guide pipe, one end of the flow guide pipe is provided with a double-way pipe, and the double-way pipe is connected with a metering unit.

[0012] Preferably, one side of the tank body is provided with a nitrogen vulcanization gas inlet assembly, the nitrogen vulcanization gas inlet assembly comprises an inlet pipe, one end of the inlet pipe is provided with an on-off ball valve, the inlet pipe is connected with a flexible joint, the flexible joint is connected with a top exhaust pipe, and the top exhaust pipe is communicated with the top of the tank body.

[0013] In the above technical scheme, the double-chamber kiln pulverized coal injection device provided by the utility model can accurately control the injection amount, (1) the pulverized coal in the device is filled into the injection tank by gravity, the weight of the pulverized coal tank is monitored in real time through the weighing sensor, thereby the pulverized coal injection amount is monitored, the frequency converter controls the feeder, and the injection rate is adjusted in the first stage. One main injection pipeline is connected to each feeder, an anti-explosion switching valve is arranged on the conveying pipeline, the main pipeline is divided into two branches, A chamber or B chamber of the double-chamber kiln can be selected, each branch corresponds to one pulverized coal distributor, the pulverized coal is injected into 33 pulverized coal injection guns corresponding to one kiln chamber through the distributor, and a flow control valve is arranged behind the distributor, the opening degree of the valve can be adjusted, the secondary adjustment of the pulverized coal amount of each injection gun is realized, and the purpose of optimizing calcination is achieved; (2) the device has the advantages that the injection is secondarily adjustable, the pulverized coal is quantitatively injected through the weighing sensor and the feeder in the first stage, and the pulverized coal injection rate can be set on the upper computer, and the flow of each branch behind the distributor is adjusted through the special flow regulating valve arranged behind the distributor in the second stage. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical schemes in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the utility model, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0015] Figure 1The utility model provides a whole structure schematic diagram provided by the embodiment of the double hearth kiln coal powder injection device of precision control injection amount.

[0016] Figure 2 The utility model provides a tank body structure schematic diagram provided by the embodiment of the double hearth kiln coal powder injection device of precision control injection amount.

[0017] Figure 3 The utility model provides branch pipe schematic diagram provided by the embodiment of the double hearth kiln coal powder injection device of precision control injection amount.

[0018] Figure 4 The utility model provides the overhead schematic diagram of A and B kiln hearth distributor provided by the embodiment of the double hearth kiln coal powder injection device of precision control injection amount.

[0019] Figure 5 The utility model provides branch flow regulating valve schematic diagram provided by the embodiment of the double hearth kiln coal powder injection device of precision control injection amount.

[0020] Mark explanation:

[0021] 1 manual maintenance gate valve, 2 partition valve, 3 flexible joint, 4 coal powder injection jar inlet valve, 5 tank body, 6 weighing sensor, 7 coal powder distributor, 8 metering unit, 9 feeder, 10 A kiln hearth pipeline, 11 B kiln hearth pipeline, 12 distributor, 13 branch flow regulating valve, 14 anti -explosion switch valve, 15 flow guide pipe, 16 double -way pipe, 17 on -off ball valve, 18 air inlet pipe, 19 flexible joint, 20 top exhaust pipe. Specific implementation

[0022] In order to make the technical personnel of the prior art better understand the technical scheme of the utility model, the utility model will be introduced further in the following with the attached drawing.

[0023] As Figures 1-5 The utility model discloses a double hearth kiln coal powder injection device of precision control injection amount, including tank body 5, the bottom of tank body 5 is provided with two metering and feeding assemblies, and the metering and feeding assembly includes metering unit 8 and feeder 9, and the feeder 9 is arranged at the discharge end of metering unit 8, and the output end of two feeders 9 is provided with two branches, and the two branches are A kiln hearth pipeline 10 and B kiln hearth pipeline 11 respectively, and the tail end of A kiln hearth pipeline 10 and B kiln hearth pipeline 11 is provided with distributor 12, and the distributor 12 is connected with branch flow regulating valve 13.

[0024] Specifically, in the present embodiment, the metering unit 8 delivers the distributed pulverized coal to the feeder 9, the feeder 9 is arranged at the discharge end of the metering unit 8, the output ends of the two feeders 9 are each provided with two branches, the discharge end of the feeder 9 is provided with a main pipeline, the end of the main pipeline is provided with two branch pipelines, the two branches are respectively an A hearth pipeline 10 and a B hearth pipeline 11, the ends of the A hearth pipeline 10 and the B hearth pipeline 11 are each provided with a distributor 12, the distributor 12 is connected to the pulverized coal distribution inside the hearth, the distributor 12 is connected with a branch flow regulating valve 13, the branch flow regulating valve 13 is used to adjust the flow rate and flow of the spray gun connected with the distributor;

[0025] Preferably, the A hearth pipeline 10 and the B hearth pipeline 11 are each provided with an explosion-proof switching valve 14, which can realize separate distribution of the pulverized coal to the A hearth pipeline 10 and the B hearth pipeline 11, and spray the pulverized coal out through the branch flow regulating valve by using the distributor.

[0026] Preferably, the branch flow regulating valve 13 is provided with a scale of 0-15, the scale 0 is a full flow interface, and the scale 15 is a minimum flow cross section, when the scale is 0, the flow interface is maximum, and when the scale is 15, the flow interface is minimum.

[0027] Preferably, it further includes a manual maintenance gate valve 1, a cutoff valve 2, a flexible joint 3, and a pulverized coal injection tank inlet valve 4, the pulverized coal injection tank inlet valve 4 is arranged at the top of the tank body 5, the manual maintenance gate valve 1, the cutoff valve 2, the flexible joint 3, and the pulverized coal injection tank inlet valve 4 are sequentially connected from top to bottom, the pulverized coal sequentially passes through the manual maintenance gate valve 1, the cutoff valve 2, the flexible joint 3, and the pulverized coal injection tank inlet valve 4 to enter the inside of the tank body 5, and the prior art is not described here.

[0028] Preferably, the inside of the tank body 5 is provided with a weighing sensor 6, and the weighing sensor is connected with a pulverized coal distributor 7.

[0029] A double-hearth kiln pulverized coal injection device for precise control of injection amount further includes a PLC control cabinet, a frequency converter cabinet, and an upper computer, the PLC control cabinet and the frequency converter cabinet are connected with the weighing sensor 6, the feeder 9, and the pulverized coal distributor 7 through wires, the prior art is not described here, first, the pulverized coal is filled into the injection tank by gravity, the weight of the pulverized coal tank is monitored in real time by the weighing sensor, so as to monitor the pulverized coal injection amount, the frequency converter controls the feeder, and the injection rate is adjusted in the first quarter. One main injection pipeline is connected to each feeder, an explosion-proof switching valve is arranged on the conveying pipeline to divide the main pipeline into two routes, A hearth or B hearth of the double-hearth kiln can be selected, each branch corresponds to one pulverized coal distributor, the pulverized coal is injected into the corresponding 33 pulverized coal spray guns of one of the hearths through the distributor, as shown in the accompanying drawings. Figure 4As shown, the plan view of the left distributor is 1 / 16, the plan view of the right distributor is 1 / 17, and the access to the A and B kiln is 33 pulverized coal injection guns respectively, a flow control valve is arranged behind the distributor, the valve opening degree can be adjusted to realize the secondary adjustment of the pulverized coal quantity of each injection gun, so as to achieve the purpose of optimizing calcination

[0030] Preferably, the weighing sensor 6 is further provided with a flow guide pipe 15, one end of the flow guide pipe 15 is provided with a double pipe 16, the double pipe 16 is connected with the metering unit, the weighing sensor monitors the weight of the pulverized coal tank in real time, so as to monitor the pulverized coal injection quantity, and the pulverized coal is transported to the double pipe through the flow guide pipe 15, and the feeder is controlled by the frequency converter.

[0031] Preferably, one side of the tank body 5 is provided with a nitrogen vulcanization gas inlet assembly, the nitrogen vulcanization gas inlet assembly comprises a gas inlet pipe 18, one end of the gas inlet pipe 18 is provided with an on-off ball valve 17, the on-off ball valve 17 controls the opening and closing of the gas inlet pipe 18, the gas inlet pipe 18 is connected with a flexible joint 19, the flexible joint 19 avoids damage or separation of the gas inlet pipe 18 caused by vibration during use, the flexible joint 19 is connected with a top exhaust pipe 20, and the top exhaust pipe 20 is communicated with the top of the tank body 5.

[0032] Example 1

[0033] A double-chamber kiln pulverized coal injection device for accurately controlling the injection quantity, the metering unit 8 delivers the distributed pulverized coal to the feeder 9, the feeder 9 is arranged at the discharge end of the metering unit 8, the output ends of the two feeders 9 are both provided with two branches, the discharge end of the feeder 9 is provided with a main pipe, the tail end of the main pipe is two branch pipes, the two branches are an A kiln tunnel pipe 10 and a B kiln tunnel pipe 11 respectively, the tail ends of the A kiln tunnel pipe 10 and the B kiln tunnel pipe 11 are both provided with a distributor 12, the distributor 12 is connected with a branch flow regulating valve 13.

[0034] Example 2

[0035] The embodiment is further limited based on the embodiment 1, the A kiln channel pipeline 10 and the B kiln channel pipeline 11 are provided with the explosion-proof switch valve 14, the coal powder to the A kiln channel pipeline 10 and the B kiln channel pipeline 11 can be realized individually distributed, and is sprayed by the distributor through the branch flow regulating valve; the branch flow regulating valve 13 is provided with the scale of 0-15, the scale 0 is the full flow interface, and the scale 15 is the minimum flow cross section, when the scale is 0, the flow interface is maximum, and when the scale is 15, the flow interface is minimum; further comprising the manual maintenance gate valve 1, the cutoff valve 2, the flexible joint 3, the coal powder injection tank inlet valve 4, the coal powder injection tank inlet valve 4 is arranged at the top of the tank body 5, the manual maintenance gate valve 1, the cutoff valve 2, the flexible joint 3 and the coal powder injection tank inlet valve 4 are sequentially connected from top to bottom, the coal powder sequentially passes through the manual maintenance gate valve 1, the cutoff valve 2, the flexible joint 3 and the coal powder injection tank inlet valve 4 and enters the inside of the tank body 5, and the prior art is not described one by one; the inside of the tank body 5 is provided with the weighing sensor 6, the weighing sensor is connected with the coal powder distributor 7; the weighing sensor 6 is further provided with the flow guide pipe 15, one end of the flow guide pipe 15 is provided with the double-way pipe 16, the double-way pipe 16 is connected with the metering unit, the weighing sensor monitors the coal powder tank weight in real time, so that the coal powder injection amount is monitored, and is delivered to the double-way pipe through the flow guide pipe 15, and is controlled by the frequency converter to the feeder; one side of the tank body 5 is provided with the nitrogen vulcanization gas inlet assembly, the nitrogen vulcanization gas inlet assembly comprises the gas inlet pipe 18, one end of the gas inlet pipe 18 is provided with the on-off ball valve 17, the on-off ball valve 17 controls the opening and closing of the gas inlet pipe 18, the gas inlet pipe 18 is connected with the flexible joint 19, the flexible joint 19 avoids damage or separation of the gas inlet pipe 18 caused by vibration during use, the flexible joint 19 is connected with the top exhaust pipe 20, and the top exhaust pipe 20 is communicated with the top of the tank body 5.

[0036] Some demonstrative embodiments of the present application are described above by way of illustration only. It should be apparent that there are numerous ways of modifying the described embodiments without departing from the spirit and scope of the application. Therefore, the above-described drawings and descriptions should not be construed to limit the scope of the present application, but merely to explain exemplary embodiments thereof.

Claims

1. A double hearth kiln pulverized coal injection device for precisely controlling the injection amount, characterized by, Including the tank body (5), the bottom of the tank body (5) is provided with two metering assembly, the metering assembly includes metering unit (8) and feeder (9), the feeder (9) is arranged at the discharge end of metering unit (8), the output end of two feeder (9) is provided with two branches, two branches are A kiln hearth pipeline (10) and B kiln hearth pipeline (11) respectively, the end of A kiln hearth pipeline (10) and B kiln hearth pipeline (11) is provided with distributor (12), the distributor (12) is connected with branch flow regulating valve (13).

2. The double furnace kiln pulverized coal injection device with precise control of injection amount according to claim 1, characterized in that, The A kiln hearth pipeline (10) and B kiln hearth pipeline (11) are provided with explosion-proof switch valve (14).

3. The double furnace kiln pulverized coal injection device with precise control of injection amount according to claim 1, characterized in that, The branch flow regulating valve (13) is provided with 0-15 scale, scale 0 is full flow interface, 15 is the minimum flow cross section.

4. The double furnace kiln pulverized coal injection device with precise control of injection amount according to claim 1, characterized in that, It also includes manual maintenance gate valve (1), cutoff valve (2), flexible joint (3), pulverized coal injection tank inlet valve (4), the pulverized coal injection tank inlet valve (4) is arranged at the top of the tank body (5), the manual maintenance gate valve (1), cutoff valve (2), flexible joint (3), pulverized coal injection tank inlet valve (4) are connected in order from top to bottom.

5. The double furnace kiln pulverized coal injection device with precise control of injection amount according to claim 1, characterized in that, The inside of the tank body (5) is provided with a load cell (6), the load cell is connected with a pulverized coal distributor (7).

6. The double furnace kiln pulverized coal injection device with precise control of injection amount according to claim 5, characterized in that, The load cell (6) is also provided with a flow guide pipe (15), one end of the flow guide pipe (15) is provided with a double-way pipe (16), the double-way pipe (16) is connected with the metering unit.

7. The double furnace kiln pulverized coal injection device with precise control of injection amount according to claim 1, characterized in that, One side of the tank body (5) is provided with a nitrogen vulcanization gas inlet assembly, the nitrogen vulcanization gas inlet assembly includes an inlet pipe (18), one end of the inlet pipe (18) is provided with an on-off ball valve (17), the inlet pipe (18) is connected with a flexible joint (19), the flexible joint (19) is connected with a top exhaust pipe (20), the top exhaust pipe (20) is communicated with the top of the tank body (5).

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