Quantitative feeding device for feeding sludge into incinerator

Abstract

A quantitative feeding device for feeding sludge into an incinerator comprises a sludge bin, a discharging arm, a weighing screw feeder, a rotary feeding valve, a feeding pipe, a discharging scraper, a variable-frequency gear motor and related accessories. The unloading arm is arranged at the bottom of the sludge bin and is used for controlling the sludge unloading frequency. An inlet of the weighing screw feeder is connected with a discharging outlet in the bottom of a sludge bin, a rotary feeding valve is arranged at an outlet of the weighing screw feeder, a compensator is installed at an outlet of the rotary feeding valve and used for compensating expansion at a connector, a feeding pipe is arranged at the sludge feeding position, and a discharging scraper arranged in the feeding pipe is driven by a variable frequency motor. And the unloading arm is driven by a variable frequency motor at variable speed. The weighing screw feeder adopts a shaftless screw and is driven by a variable frequency motor at a variable speed. The sludge quantitative feeding device can realize quantitative and accurate feeding of sludge, has the characteristic of blocking prevention, and is particularly suitable for quantitative feeding of sludge with different viscosities.

Description

Technical Field

[0001] The utility model belongs to the technical field of sludge incineration and relates to a quantitative feeding device for sludge into an incinerator. Background Art

[0002] The incineration treatment of sludge can effectively utilize the available calorific value of sludge, realize the rapid reduction, harmless treatment and resource utilization of sludge, and has great social and economic benefits. Sludge with different moisture contents has different viscosities, specific gravities and calorific values. When carrying out sludge incineration treatment, a sludge quantitative feeding device is usually used to ensure the stability and quantitative feeding of sludge. The stable quantitative feeding of sludge directly determines the stability, safety and economy of incineration. Chinese patent ZL202320825653.8 discloses a sludge feeding system, which can solve the caching and feeding of sludge, but cannot effectively solve the quantitative feeding and stable feeding of sludge into the furnace. Chinese patent CN116557874A discloses a sludge storage and furnace feeding system, but the invention cannot effectively solve the problem of clogging of sludge feeding pipes with different moisture and viscosity. Utility Model Content

[0003] In view of the above-mentioned deficiencies of the prior art, the utility model provides a quantitative feeding device for sludge into an incinerator, which solves the problems of blockage, accurate metering, poor stability and adaptability in the existing sludge feeding system.

[0004] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A quantitative feeding device for sludge into an incinerator comprises a sludge bin, a discharge arm, a weighing screw feeder, a rotary feeding valve, a feeding pipe, a discharge scraper and a variable frequency reduction motor; the discharge arm is arranged at the bottom of the sludge bin, and the discharge arm is driven by a variable frequency motor to discharge; the inlet of the weighing screw feeder is connected with the discharge outlet at the bottom of the sludge bin, the outlet of the weighing screw feeder is provided with a rotary feeding valve, and the weighing screw feeder is connected with the feeding pipe through the rotary feeding valve; the weighing screw feeder is provided with a weight sensor, and the shaftless screw used by the weighing screw feeder is driven by a variable frequency motor to change speed through the weight sensor feedback signal; the discharge scraper driven by the variable frequency motor is installed in the feeding pipe.

[0006] Furthermore, a metal compensator is provided between the rotary feeding valve and the feeding pipe to compensate for the expansion at the interface of the incinerator. The metal compensator is a corrugated metal compensator.

[0007] Furthermore, the unloading scraper is V-shaped, and the angle β between the two wings of the unloading scraper V is 135~145°; the total length of the unloading scraper L1 ≥ 0.6L, the wing length of the unloading scraper L3 = 0.25~0.35D, and the length of the unloading scraper beyond the access point L2 ≥ 0.25L, where L is the length of the feeding pipe, and D is the inner diameter of the feeding pipe; the distance between the unloading scraper and the inner wall of the feeding pipe is ≤ 5mm;

[0008] The advantages of the utility model are mainly reflected in the following aspects:

[0009] Firstly, the sludge unloading arm controlled by the feedback signal of the weighing screw weighing sensor can well control the discharge of sludge, ensuring that the sludge will not be accumulated in large quantities at the feeder inlet due to excessive feed of the screw feeder, and ensuring that ineffective feeding will not occur due to too little feed of the screw feeder. At the same time, the design can adopt different unloading rates for sludge with different moisture content (specific gravity) to maintain efficient sludge unloading.

[0010] Secondly, the shaftless screw feeder can better adapt to the changes in sludge moisture content and particle size, and will not cause blockage or jamming due to the differences in sludge moisture content and particle size. The screw feeder that controls the speed through weight feedback signals can accurately calculate the amount of screw feeding, thereby achieving precise control of the amount of sludge entering the furnace.

[0011] Thirdly, the rotary feeding valve arranged between the screw feeder and the feeding pipe can evenly distribute the amount of sludge entering the furnace. At the same time, it can separate the upper sludge feeding system and the lower sludge entering the furnace, thus improving the safety of the system.

[0012] Fourthly, the feeding pipe with a discharging scraper can effectively prevent the sludge entering the furnace from becoming compacted and sticking to the wall, thereby ensuring the stability of the sludge entering the furnace. In addition, the design has very good spatial adaptability and can arrange different furnace entry angles according to actual spatial conditions.

[0013] Fifthly, the entire quantitative feeding device has few parts, simple structure, low energy consumption and good adaptability, and is particularly suitable for feeding and entering the furnace of sludge with different moisture contents and particle sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the device for quantitatively feeding sludge into the incinerator.

[0015] Figure 2 It is a cross-sectional diagram of the arrangement of the unloading scraper in the feed pipe.

[0016] Figure 3 This is a schematic diagram of the unloading scraper structure.

[0017] In the figure: 1. Sludge silo, 2. Sludge unloading arm, 3. Weighing screw feeder, 4. Rotary feeding valve, 5. Metal compensator, 6. Feeding pipe, 7. Unloading scraper. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0019] Figure 1 As shown: the quantitative feeding device for sludge into the incinerator includes a sludge silo 1, a sludge discharge arm 2, a weighing screw feeder 3, a rotary feeding valve 4, a metal compensator 5, a feeding pipe 6, a discharge scraper 7 and a related variable frequency motor for driving. The sludge discharge arm 2 is installed at the bottom of the sludge silo 1. The outlet of the sludge silo 1 is connected to the inlet of the weighing screw feeder 3, and the connection angle is vertical 90°. The sludge discharge arm 2 is driven by a variable frequency motor, and its speed is controlled by the controller according to the feedback signal of the weighing screw weighing sensor, so as to better realize the control of the sludge discharge frequency. This control method can ensure that the sludge accumulation at the feeder inlet caused by too much feeding of the screw feeder will not be caused, and it can ensure that the ineffective feeding of the sludge will not be caused by too little feeding of the screw feeder. The weighing screw feeder 3 adopts a shaftless screw and is driven by a variable frequency motor. Tests show that the shaftless screw feeder can better adapt to changes in sludge moisture content and particle size, and will not cause blockage or jamming of materials due to differences in sludge moisture content and particle size.

[0020] The controller of the weighing screw feeder 3 will comprehensively calculate the received weighing signal and screw speed signal to obtain the instantaneous flow rate and cumulative weight value of the sludge. At the same time, the controller can dynamically adjust the screw speed by adjusting the output control signal transmitted to the frequency converter, thereby achieving accurate quantitative feeding. The screw feeder that controls the speed through the weighing signal can better achieve accurate control of the amount of sludge entering the furnace after the sludge discharge arm 2 at the front end has a suitable frequency of sludge discharge.

[0021] The outlet of the weighing screw feeder 3 is connected to the inlet of the rotary feeding valve 4, and the rotary feeding valve 4 is arranged between the weighing screw feeder 3 and the feeding pipe 6, and its inlet and outlet discharge pipes are connected by vertical short pipes. The metal compensator 5 is installed at the inlet end of the feeding pipe 6, and the outlet end of the feeding pipe 6 is directly connected to the sludge interface entering the furnace.

[0022] The feed pipe 6 is provided with a discharge scraper 7, which is V-shaped. The scraper is close to the inner wall of the feed pipe and moves in a circular motion to clean the wall of the feed pipe. The clearing range is large and there is no dead angle. The distance between the scraper and the inner wall of the feed pipe is ≤5mm. The total length of the discharge scraper L1 ≥ 0.6L, and the length of the discharge scraper beyond the access point L2 ≥ 0.25L. The scraper is driven by a variable frequency motor. Experiments show that the feed pipe designed according to the above can effectively prevent the hardening and wall adhesion of the sludge entering the furnace, and ensure the stability of the sludge entering the furnace.

[0023] The wing length of the unloading scraper 7 is L3 = 0.25~0.35D, where D is the diameter of the feed pipe 6. The angle between the two wings of the unloading scraper V-shaped is β = 135~145°. In this embodiment, the optimal ratio is L3 = 0.28D, and the angle between the two wings of the scraper is β = 140°. According to the above design, the unloading scraper 7 can efficiently unload the sludge adhering to the wall of the feed pipe without causing deformation and damage to the scraper due to excessive force.

[0024] Instructions for use: The sludge feeding pipe designed as above has very good spatial adaptability. The feeding pipe can be arranged at different furnace entry angles according to the actual spatial conditions on site. In this example, the furnace entry angle of the feeding pipe 6 is α=60°. The feeding pipe can adapt to the range of the furnace entry angle of α=50~90°, which can ensure efficient feeding.

Claims

1. A quantitative feeding device for sludge into an incinerator, characterized in that: It includes a sludge bin, a discharge arm, a weighing screw feeder, a rotary feeding valve, a feeding pipe, a discharge scraper, and a variable frequency reduction motor; the discharge arm is arranged at the bottom of the sludge bin, and the discharge arm is driven by a variable frequency motor to discharge; the inlet of the weighing screw feeder is connected with the discharge outlet at the bottom of the sludge bin, and the outlet of the weighing screw feeder is provided with a rotary feeding valve, and the weighing screw feeder is connected to the feeding pipe through the rotary feeding valve; the weighing screw feeder is provided with a weight sensor, and the shaftless screw used by the weighing screw feeder is driven by a variable frequency motor for variable speed through the weight sensor feedback signal; a discharge scraper driven by a variable frequency motor is installed in the feeding pipe.

2. A quantitative feeding device for sludge into an incinerator according to claim 1, characterized in that: A metal compensator is arranged between the rotary feeding valve and the feeding pipe, and the metal compensator adopts a corrugated metal compensator.

3. The device for quantitatively feeding sludge into an incinerator according to claim 1, characterized in that: The unloading scraper is V-shaped, and the angle β between the two wings of the V-shaped unloading scraper is 135~145°; the total length of the unloading scraper L1≥0.6L, the wing length of the unloading scraper L3=0.25~0.35D, the length of the unloading scraper beyond the access point L2≥0.25L, where L is the length of the feeding pipe and D is the inner diameter of the feeding pipe; the distance between the unloading scraper and the inner wall of the feeding pipe is ≤5mm.

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