阅读说明：本技术 气固两相流双可调分配器和缩孔一体化装置 (Gas-solid two-phase flow double-adjustable distributor and shrinkage cavity integrated device ) 是由 冯万春 张野 陈军 于 2019-10-16 设计创作，主要内容包括：本发明气固两相流双可调分配器和缩孔一体化装置包括：空气流量传感器、煤粉浓度传感器、变送器、控制器、执行器、分配器壳体、流量调节板、转轴、浓度调节板、入口固定缩孔和出口固定缩孔,分配器壳体为Y型管,在分配器壳体下部装有两块煤粉浓度调节板,在靠近分配器壳体上端的Y型分支处装有一块空气流量调节板,在分配器壳体下端入口处布置一入口固定缩孔,在分配器壳体上端两出口处分别布置一出口固定缩孔,在两根燃烧器入口管内装有空气流量传感器和煤粉浓度传感器,空气流量传感器和煤粉浓度传感器分别与各自的变送器、控制器和执行器相连,执行器分别装在流量调节板和浓度调节板的转轴上,控制着流量调节板和浓度调节板的摆动角度。(The invention relates to a gas-solid two-phase flow double-adjustable distributor and shrinkage cavity integrated device, which comprises: an air flow sensor, a pulverized coal concentration sensor, a transmitter, a controller, an actuator, a distributor shell, a flow adjusting plate, a rotating shaft, a concentration adjusting plate, an inlet fixed shrinkage cavity and an outlet fixed shrinkage cavity, wherein the distributor shell is a Y-shaped pipe, two pulverized coal concentration adjusting plates are arranged at the lower part of the distributor shell, an air flow adjusting plate is arranged at the Y-shaped branch close to the upper end of the distributor shell, an inlet fixed shrinkage cavity is arranged at an inlet at the lower end of the distributor shell, two outlet fixed shrinkage cavities are respectively arranged at two outlets at the upper end of the distributor shell, air flow sensors and coal powder concentration sensors are arranged in the two burner inlet pipes, the air flow sensors and the coal powder concentration sensors are respectively connected with respective transmitters, controllers and actuators, and the actuators are respectively arranged on rotating shafts of a flow adjusting plate and a concentration adjusting plate and control the swinging angles of the flow adjusting plate and the concentration adjusting plate.)

1. The utility model provides a two adjustable distributors of gas-solid two-phase flow and shrinkage cavity integrated device, two exports in two adjustable distributors of gas-solid two-phase flow and shrinkage cavity integrated device upper end link to each other with two combustor inlet tubes (11) through the flange respectively, and the lower extreme entry passes through the flange and links to each other with coal pulverizer outlet pipe (12), and two adjustable distributors of gas-solid two-phase flow and shrinkage cavity integrated device include: air flow sensor (1), buggy consistency transmitter (2), changer (3), controller (4), executor (5), distributor housing (6), flow control board (7), pivot (8), consistency control board (9), fixed shrinkage cavity (10) of export and the fixed shrinkage cavity of entry (16), distributor housing (6) are the Y type pipe, two buggy consistency control boards (9) are equipped with in distributor housing (6) lower part, an air flow control board (7) are equipped with in Y type branch department of being close to distributor housing upper end, be equipped with a pivot (8) on buggy consistency control board (9) and air flow control board (7) respectively, pivot (8) pass distributor housing (6) and drive buggy consistency control board (9) and air flow control board (7) swing respectively, its characterized in that: an inlet fixing shrinkage cavity (16) is arranged at an inlet at the lower end of a distributor shell (6), outlet fixing shrinkage cavities (10) are respectively arranged at two outlets at the upper end of the distributor shell (6), at least one air flow sensor (1) and at least one coal powder concentration sensor (2) are respectively arranged in two combustor inlet pipes (11), the air flow sensor (1) and the coal powder concentration sensor (2) are respectively connected with respective transmitters (3) through information lines, a controller (4) and an actuator (5), the actuator (5) is respectively arranged on rotating shafts (8) of a flow adjusting plate (7) and a concentration adjusting plate (9), and the swinging angles of the flow adjusting plate (7) and the concentration adjusting plate (9) are controlled.

2. The dual adjustable distributor and shrinkage cavity integrated device for gas-solid two-phase flow of claim 1, wherein: the outlet fixing shrinkage holes (10) are fixed at two outlets at the upper end of the distributor shell (6) in a bonding, welding or bolt connection mode; the inlet fixing shrinkage cavity (16) is fixed at the inlet at the lower end of the distributor shell (6) in a bonding, welding or bolt connection mode.

3. The dual adjustable distributor and throat integrated apparatus for a gas-solid two-phase flow of claim 2, wherein: the cross sections of the outlet fixing shrinkage cavity (10) and the inlet fixing shrinkage cavity (16) close to one side of the distributor shell (6) are triangular.

4. The dual adjustable distributor and shrinkage cavity integrated device for gas-solid two-phase flow of claim 3, wherein: the outlet fixed shrinkage cavity (10) and the inlet fixed shrinkage cavity (16) are made of silicon carbide ceramic materials.

5. The dual adjustable distributor and shrinkage cavity integrated device for gas-solid two-phase flow of claim 4, wherein: an air flow sensor (1) and a pulverized coal concentration sensor (2) are respectively arranged in the two burner inlet pipes (11), one pulverized coal concentration sensor (2) in each burner inlet pipe (11) is respectively connected with a transmitter (3), a controller (4) and an actuator (5) in sequence, and the swinging of the two concentration adjusting plates (9) is respectively controlled; one air flow sensor (1) in each burner inlet pipe (11) is connected with a transmitter (3), a controller (4) and an actuator (5) in sequence, and controls the swing of a flow adjusting plate (7).

6. The dual adjustable distributor and shrinkage cavity integrated device for gas-solid two-phase flow of claim 5, wherein: the actuator (5) is a DJK angular travel electric actuator.

Technical Field

The invention relates to a double-adjustable pulverized coal distributor, in particular to a gas-solid two-phase flow double-adjustable distributor and shrinkage cavity integrated device.

Background

In the industrial production of electric power in China, the main power equipment of a coal-fired power plant is mainly a coal-fired boiler. The economic operation of pulverized coal boilers greatly affects the benefits of power enterprises and the loss of equipment. The pulverized coal distributor and the adjustable shrinkage cavity are one of key devices of a combustion pulverizing system of a thermal power plant, are responsible for reasonably organizing boiler combustion, effectively controlling a temperature field in a boiler and adjusting inlet and outlet air pressure, can ensure that the combustion power of each combustor is equal and the ignition conditions are the same, prevent the boiler from tube explosion caused by slag bonding and thermal deviation in the boiler and avoid the blockage or ignition of a pulverized coal pipeline.

The ultra-supercritical 1000 MW-grade unit boiler mostly adopts the direct-fired pulverizing system, and generally, each coal mill needs to provide primary air for 4 burners or even 8 burners on a certain layer of the boiler, so that the uniformity of primary air distribution of the direct-fired pulverizing system is improved, and the stability of primary air pressure is ensured to be more and more emphasized. If the distribution of the pulverized coal and the air has larger deviation, the ignition of primary air at the outlet of the burner and the combustion working condition of the whole hearth are influenced, and the problems of flame deflection, steam temperature deviation, even boiler tube explosion and the like in the furnace are caused. The primary air pressure is unstable, which causes the abrasion and blockage of the powder feeding pipeline, and the problems of advanced or delayed combustion, unstable ignition and the like. Meanwhile, the problems of abrasion of the pulverized coal distributor and the adjustable shrinkage cavity, interference of the adjustable shrinkage cavity and powder leakage are difficult to solve due to the high airflow velocity of primary air.

The Chinese invention patent (application number: ZL 201610636129.0) discloses a double-adjustable coal powder distributor, wherein a concentration adjusting plate and a flow adjusting plate are arranged in the double-adjustable coal powder distributor. In practical use, the adjustable shrinkage cavities are sequentially arranged on the coal mill outlet pipe and the combustor inlet pipe in front of and behind the double adjustable coal powder distributor, namely the adjustable shrinkage cavities are arranged at the inlet end of the distributor and used for adjusting the wind pressure of primary air at the inlet of the distributor, the two outlet ends of the distributor are provided with the two adjustable shrinkage cavities, and the two adjustable shrinkage cavities are used for adjusting the wind pressure of the primary air at the two outlets of the distributor. It also has the problems of abrasion and blockage of the powder feeding pipeline system, early or late combustion, unstable ignition and the like. Meanwhile, the phenomena of interference and powder leakage of the adjustable shrinkage cavity are difficult to solve.

Disclosure of Invention

The invention aims to solve the problems that a powder feeding pipeline system of the existing double-adjustable pulverized coal distributor is easy to wear and block, the adjustable shrinkage cavity is easy to generate phenomena of interference, powder leakage and the like, and the concentration of the fed boiler pulverized coal is not uniform, and provides the gas-solid two-phase flow double-adjustable distributor and the shrinkage cavity integrated device.

The invention relates to a gas-solid two-phase flow double-adjustable distributor and shrinkage cavity integrated device, wherein two outlets at the upper end of the gas-solid two-phase flow double-adjustable distributor and the shrinkage cavity integrated device are respectively connected with two burner inlet pipes through flanges, an inlet at the lower end of the gas-solid two-phase flow double-adjustable distributor and the shrinkage cavity integrated device are connected with an outlet pipe of a coal mill through flanges, and the gas-solid two-phase flow double-adjustable distributor and the shrinkage cavity integrated device: air flow sensor, buggy concentration sensor, the changer, a controller, the executor, the distributor casing, the flow control board, the apparatus further comprises a rotating shaft, the concentration control board, the fixed shrinkage cavity of entry and the fixed shrinkage cavity of export, the distributor casing is Y type pipe, two buggy concentration control boards are equipped with in distributor casing lower part, an air flow control board is equipped with in Y type branch department near distributor casing upper end, a pivot is equipped with respectively on buggy concentration control board and the air flow control board, the distributor casing is passed and drive buggy concentration control board and air flow control board swing respectively to the one end of pivot, wherein: an inlet fixing shrinkage cavity is arranged at an inlet at the lower end of the distributor shell, outlet fixing shrinkage cavities are respectively arranged at two outlets at the upper end of the distributor shell, at least one air flow sensor and at least one coal powder concentration sensor are respectively arranged in inlet pipes of the two combustors, the air flow sensor and the coal powder concentration sensor are respectively connected with a transmitter, a controller and an actuator through information wires, and the actuator is respectively arranged on rotating shafts of a flow regulating plate and a concentration regulating plate and controls the swing angles of the flow regulating plate and the concentration regulating plate.

The invention relates to a gas-solid two-phase flow double-adjustable distributor and shrinkage cavity integrated device, wherein: the outlet fixing shrinkage holes are fixed at two outlets at the upper end of the distributor shell in a bonding, welding or bolt connection mode; the inlet fixing shrinkage cavity is fixed at the inlet at the lower end of the distributor shell in a bonding, welding or bolt connection mode.

The invention relates to a gas-solid two-phase flow double-adjustable distributor and shrinkage cavity integrated device, wherein: the cross sections of the outlet fixed shrinkage cavity and the inlet fixed shrinkage cavity close to one side of the distributor shell are triangular.

The invention relates to a gas-solid two-phase flow double-adjustable distributor and shrinkage cavity integrated device, wherein: the outlet fixed shrinkage cavity and the inlet fixed shrinkage cavity are made of silicon carbide ceramic materials.

The invention relates to a gas-solid two-phase flow double-adjustable distributor and shrinkage cavity integrated device, wherein: an air flow sensor and a pulverized coal concentration sensor are respectively arranged in the inlet pipes of the two burners, and one pulverized coal concentration sensor in each inlet pipe of the burners is respectively connected with a transmitter, a controller and an actuator in turn and respectively controls the swinging of the two concentration adjusting plates; an air flow sensor in each burner inlet tube is connected with the transmitter, the controller and the actuator in turn, and controls the swing of the flow adjusting plate.

The invention relates to a gas-solid two-phase flow double-adjustable distributor and shrinkage cavity integrated device, wherein: the actuator is a DJK angle stroke electric actuator.

The gas-solid two-phase flow double-adjustable distributor and shrinkage cavity integrated device simplifies the structure, replaces adjustable shrinkage cavity equipment at the inlet and the outlet of the distributor with fixed shrinkage cavities, can realize uniform distribution of coal dust and air at the two outlets through the air flow sensor, the coal dust concentration sensor, the transmitter, the controller and the actuator, and can realize real-time online automatic adjustment. Meanwhile, the fixed shrinkage cavity using the wear-resistant silicon carbide ceramic increases the wear resistance of equipment and is not easy to generate powder leakage, the fixed shrinkage cavity of the wear-resistant silicon carbide ceramic is fixed firmly and is not easy to fall off, the service life is prolonged, the workload and the maintenance cost of daily maintenance are reduced, the operation is reliable, and the safety is greatly improved.

drawings

FIG. 1 is a schematic forward view of a dual adjustable coal fines distributor of the prior art;

FIG. 2 is a schematic forward view of the gas-solid two-phase flow dual adjustable distributor and shrinkage cavity integrated device of the present invention;

Fig. 3 is a side view of fig. 2.

In fig. 1, 2 and 3, reference numeral 1 denotes an air flow sensor; the reference numeral 2 is a pulverized coal concentration sensor; reference numeral 3 is a transmitter; reference numeral 4 is a controller; reference numeral 5 is an actuator; reference numeral 6 is a dispenser housing; reference numeral 7 is a flow regulating plate; reference numeral 8 denotes a rotary shaft; reference numeral 9 is a density adjusting plate; reference numeral 10 is an outlet fixing shrinkage cavity; reference numeral 11 is a burner inlet pipe; reference numeral 12 is a coal mill outlet pipe; reference numeral 13 is an adjustable shrinkage cavity of the distributor outlet; reference numeral 14 is a manual adjustment handle; reference numeral 15 is an adjustable shrinkage cavity of the distributor inlet; reference numeral 16 is an inlet fixing shrinkage cavity.

Detailed Description

As shown in fig. 1, in the prior art, two outlets at the upper end of the double adjustable coal powder distributor are respectively connected with two adjustable shrinkage cavities 13 at the outlet of the distributor and two burner inlet pipes 11 in turn through flanges, and the inlet at the lower end is connected with an outlet pipe 12 of the coal mill and an adjustable shrinkage cavity 15 at the inlet of the distributor in turn through flanges, and the double adjustable coal powder distributor comprises: distributor housing 6, flow control baffle 7, pivot 8, concentration adjusting plate 9 and manual adjustment handle 14, distributor housing 6 is Y type pipe, be equipped with two buggy concentration adjusting plate 9 in distributor housing 6 lower part, be equipped with an air flow control plate 7 in the Y type branch department that is close to distributor housing 6 upper end, a pivot 8 is equipped with respectively on buggy concentration adjusting plate 9 and the air flow control plate 7, pivot 8 passes distributor housing 6 and links to each other with manual adjustment handle 14, manual adjustment handle 14 drives buggy concentration adjusting plate 9 and the swing of air flow control plate 7 respectively.

As shown in fig. 2 and 3, the two outlets at the upper end of the gas-solid two-phase flow dual-adjustable distributor and shrinkage cavity integrated device of the present invention are respectively connected with two burner inlet pipes 11 through flanges, the inlet at the lower end is connected with a coal mill outlet pipe 12 through a flange, the gas-solid two-phase flow dual-adjustable distributor and shrinkage cavity integrated device comprises: the coal dust concentration control device comprises an air flow sensor 1, coal dust concentration sensors 2, a transmitter 3, a controller 4, an actuator 5, a distributor shell 6, a flow control plate 7, a rotating shaft 8, a concentration control plate 9, an outlet fixing shrinkage cavity 10 and an inlet fixing shrinkage cavity 16, wherein the distributor shell 6 is a Y-shaped pipe, two coal dust concentration control plates 9 are arranged at the lower part of the distributor shell 6, an air flow control plate 7 is arranged at a Y-shaped branch position close to the upper end of the distributor shell, the rotating shaft 8 is respectively arranged on the coal dust concentration control plate 9 and the air flow control plate 7, the rotating shaft 8 penetrates through the distributor shell 6 and respectively drives the coal dust concentration control plate 9 and the air flow control plate 7 to swing, an air flow sensor 1 and a coal dust concentration sensor 2 are respectively arranged in two combustor inlet pipes 11, and one coal dust concentration sensor 2 in, A controller 4 is connected with an actuator 5, the two actuators 5 are respectively arranged on a rotating shaft 8 of a concentration adjusting plate 9, and the actuator 5 controls the swinging angles of the two concentration adjusting plates 9; wherein two air flow sensors 1 in two burner inlet pipes 11 are connected with a transmitter 3, a controller 4 and an actuator 5 in sequence, the actuator 5 is arranged on a rotating shaft 8 of a flow adjusting plate 7, the actuator 5 controls the swinging angle of the flow adjusting plate 7, and the actuator 5 is a DJK angle stroke electric actuator.

an outlet fixing shrinkage cavity 10 is fixed at two outlets at the upper end of the distributor shell 6 respectively in a bonding, welding or bolt connection mode, an inlet fixing shrinkage cavity 16 is fixed at an inlet at the lower end of the distributor shell 6 in a bonding, welding or bolt connection mode, the cross sections of the outlet fixing shrinkage cavity 10 and the inlet fixing shrinkage cavity 16 close to one side of the distributor shell 6 are triangular, and the outlet fixing shrinkage cavity 10 and the inlet fixing shrinkage cavity 16 are formed by integrally firing a silicon carbide ceramic material.

Compared with the existing double-adjustable pulverized coal distributor, the gas-solid two-phase flow double-adjustable distributor and shrinkage cavity integrated device of the invention cancels 3 adjustable shrinkage cavities on the outlet pipe of the coal mill and the inlet pipe of the burner which are connected with the inlet and the outlet of the distributor shell 6, and the outlet fixed shrinkage cavity 10 and the inlet fixed shrinkage cavity 16 can adopt the same or different structural forms according to the design requirements to adjust the balance of pulverized coal air pressure in the pulverized coal pipeline. The outlet fixing shrinkage cavity 10 and the inlet fixing shrinkage cavity 16 on the side close to the distributor housing 6 are made of wear-resistant silicon carbide ceramics which are integrally fired. The wear-resisting property of the device is improved, the powder leakage phenomenon is not easy to generate, the wear-resisting silicon carbide ceramic is fixed firmly and is not easy to fall off, the service life is prolonged, the workload and the maintenance cost of daily maintenance are reduced, the operation is reliable, the safety is greatly improved, and the stable combustion of the combustor is ensured.

In addition, the gas-solid two-phase flow double adjustable distributor and shrinkage cavity integrated device is additionally provided with an automatic adjusting device, namely an actuator 5 is arranged on a rotating shaft 8 of a pulverized coal concentration adjusting plate 9 and an air flow adjusting plate 7, an air flow sensor 1 and a pulverized coal concentration sensor 2 are additionally arranged in two burner inlet pipes 11, real-time monitoring results of the air flow sensor 1 and the pulverized coal concentration sensor 2 are transmitted to respective controllers 4 through respective transmitters 3, the controllers 4 give instructions to the actuators 5 through analyzing the monitoring results, and the actuators 5 perform real-time online adjustment on the concentration and the air flow of pulverized coal at the outlet of the double adjustable pulverized coal distributor through the received instructions, so that a large number of monitoring personnel are saved. Under various working conditions of actual operation, the pulverized coal and air can be uniformly distributed and randomly adjusted in real time, the adjustment precision of the pulverized coal concentration is greatly improved, the combustion efficiency of the boiler is greatly improved, and the automation level of the system is improved.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.