CN210159453U

CN210159453U - Novel semi-dry desulfurization lime feeding metering system

Info

Publication number: CN210159453U
Application number: CN201920324987.0U
Authority: CN
Inventors: 李明俊; 刘轶; 钱福祥
Original assignee: Nanjing Longyuan Environment Co Ltd
Current assignee: Guoneng Longyuan environmental protection Nanjing Co.,Ltd.
Priority date: 2019-03-14
Filing date: 2019-03-14
Publication date: 2020-03-20
Anticipated expiration: 2029-03-14

Abstract

The utility model provides a novel semi-dry desulfurization lime feeding measurement system installs the unloading pipe in lime hydrate storage bin below, installs manual push-pull valve one, feed control valve, telescopic joint one, subtracts material balance, manual push-pull valve two, variable frequency batcher, telescopic joint two, rotary feeder, jet pump on the unloading pipe. The compressed air pipe is connected to the jet pump, and one end of the compressed air pipe is connected with the Roots blower and the butterfly valve. The slaked lime enters the material reducing scale through the discharging pipe, after the material reducing scale is filled with the slaked lime, the material reducing scale prompts the feeding control valve to be closed, the variable frequency feeder is opened, the opening degree is adjusted as required, and the slaked lime and compressed air provided by the Roots blower are pumped into the absorption tower through the jet pump. The utility model discloses can real-time control lime hydrate quantity, automatic start or stop, the measurement is accurate to effectively avoided the intraductal deposition condition, can effectively solve the unsafe condition of semidry desulfurization lime hydrate ratio quantity.

Description

Novel semi-dry desulfurization lime feeding metering system

Technical Field

The invention belongs to the technical field of environmental protection, and particularly relates to a novel semi-dry desulfurization slaked lime feeding metering system.

Background

With the continuous development of society, all countries in the world save energy and protect the environment.

At present, in the industries of iron and steel plants, garbage incinerators, chemical plants, smelting plants, power industry boilers and the like, in order to realize SO₂And the ultra-low emission of smoke dust, the electric dust removal technology, the wet flue gas desulfurization technology and the wet electric dust removal technology (ESP, WFGD and WESP) are mainly adopted at present. However, the ESP + WFGD + WESP technology is found to have the following disadvantages in practical use: (1) the equipment is more, the investment is high, the occupied land is more, and the construction period is long; (2) the treated smoke has white fog and poor visual effect; (3) and the byproduct of desulfurization waste water is generated, so that secondary pollution is generated. Therefore, the novel technique of semi-dry desulfurization and dust removal is popularized and adopted in China, and the requirement of ultralow emission can be met.

The feeding mode of slaked lime of a desulfurizing tower in a semi-dry desulfurization system generally adopts a variable-frequency feeder and a conveying chute to feed, and due to the fact that slaked lime powder is too fine and negative pressure in the desulfurizing tower is high, common metering equipment such as a common electronic spiral scale and a variable-frequency feeder cannot work normally, and then consumption of slaked lime cannot be accurately metered, and stable operation of the desulfurizing system is affected.

Disclosure of Invention

In order to solve the problems, the invention discloses a novel semi-dry desulfurization and slaked lime feeding and metering system which is reasonable in design, high in reliability and simple and practical in operation method and can solve the problem that the slaked lime cannot be used according to the designed proportion.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the utility model provides a novel semi-dry desulfurization lime feeding measurement system, includes unloading pipe, manual push-pull valve one, feeding control valve, subtracts material balance, manual push-pull valve two, frequency conversion batcher, rotary feeder, jet pump, manual push-pull valve one, feeding control valve install in proper order at subtract material balance anterior segment, subtract and connect gradually manual push-pull valve two, frequency conversion batcher, rotary feeder between material balance and the jet pump.

As an improvement of the invention, a first expansion joint is arranged between the feeding control valve and the material reducing scale.

As an improvement of the invention, an expansion joint II is arranged between the variable-frequency feeder and the rotary feeder.

As an improvement of the invention, the first manual gate valve is in a normally open state.

The use method of the novel semi-dry desulfurization lime feeding metering system comprises the following steps:

when the slaked lime in the material reducing scale is reduced to a set value, prompting that a feeding control valve is opened, enabling a manual gate valve I to be in a normally open state, enabling the slaked lime in a slaked lime storage bin to fall into the material reducing scale through a discharging pipe, enabling a manual gate valve II to be in a closed state, prompting that the feeding control valve is closed after the slaked lime in the material reducing scale is full, and stopping discharging;

opening a manual gate valve II, starting the variable-frequency feeder, enabling the slaked lime to enter the jet pump, enabling compressed air provided by the Roots blower to reach the jet pump, mixing with the slaked lime, and then spraying into the absorption tower to react with the flue gas; when lime in the material reducing scale is reduced to a set value, the feeding control valve is prompted to be opened to carry out the next feeding process.

As an improvement of the using method, one end of the compressed air pipe is connected with the Roots blower, and the other end of the compressed air pipe is connected with the butterfly valve.

In this system, adopt the jet pump to carry and replace the chute to carry as the charge-in system of desulfurizing tower, firstly utilize the tonifying qi measure of roots's fan to reduce negative pressure in the desulfurizing tower to charge-in system's influence, secondly can utilize the characteristic that the jet pump can long distance be carried to build the lime hydrate powder storehouse in original desulfurization position, can reduce the lime hydrate powder storehouse simultaneously and build the height, more convenient, be favorable to the arrangement of desulfurization transformation system.

In the system, the material reduction scale is arranged, so that the weighing and metering are changed from the process weighing of the electronic spiral scale to result weighing, and the metering is more accurate and reliable.

In the system, the residual amount of slaked lime in the material reducing scale is displayed on a monitoring screen of the centralized control room, so that the accurate consumption of the slaked lime can be obtained, and the consumption of the slaked lime is controlled by adjusting the opening degree of the variable-frequency feeder.

The invention has the beneficial effects that:

the slaked lime metering system is arranged below the slaked lime storage bin in the semidry desulfurization system, can monitor the consumption of slaked lime in real time, can be adjusted through the variable-frequency feeder, is convenient and accurate, has high reliability, and ensures that the slaked lime and SO in the flue gas can be accurately metered₂The full reaction improves the stability of the semi-dry desulfurization system, reduces the possibility of excessive loss of the desulfurizer, reduces the cost and improves the economic benefit.

Drawings

Fig. 1 is a schematic diagram of an embodiment of the present invention.

List of reference numerals:

1-a blanking pipe, 2-a manual gate valve I, 3-a feeding control valve, 4-a first expansion joint, 5-a material reduction scale, 6-a manual gate valve II, 7-a variable frequency feeder, 8-an expansion joint II, 9-a rotary feeder, 10-a jet pump, 11-a Roots blower, 12-a butterfly valve, 13-a compressed air pipe, 14 and a slaked lime storage bin.

Detailed Description

The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention.

As shown in the figure, the novel semi-dry desulfurization and slaked lime feeding and metering system comprises a feeding pipe 1, a manual gate valve I2, a feeding control valve 3, a first expansion joint 4, a material reducing scale 5, a second manual gate valve 6, a variable frequency feeder 7, a second expansion joint 8, a rotary feeder 9, a jet pump 10, a Roots blower 11, a butterfly valve 12, a compressed air pipe 13 and a slaked lime storage bin 14 which are sequentially connected.

In this embodiment, the blanking pipe 1 is installed below the slaked lime storage bin 14, the first manual gate valve 2 is in a normally open state, the feeding control valve 3 is opened and closed as required, when no slaked lime exists in the material reducing scale 5 or the feeding control valve is lower than a set value, the feeding control valve 3 is prompted to be opened, and when the slaked lime in the material reducing scale 5 is filled, the feeding control valve 3 is prompted to be closed to stop blanking.

The slaked lime enters the material reducing scale 5 through the discharging pipe 1, and then reaches the jet pump 10 through the manual gate valve II 6, the variable-frequency feeder 7 and the rotary feeder 9 below, the residual amount of the slaked lime in the material reducing scale 5 is displayed on a monitoring screen of the centralized control room, the accurate slaked lime using amount can be obtained, and the slaked lime using amount is controlled through adjusting the opening degree of the variable-frequency feeder 9.

The first expansion joint 4 and the second expansion joint 8 play a pipeline expansion compensation role for the blanking pipe.

Compressed air provided by the Roots blower 11 is converged with slaked lime discharged from the injection pump 10 through a compressed air pipe, and is sprayed into the absorption tower after being mixed to react with flue gas; the compressed air pipe is provided with a butterfly valve for controlling the opening and closing of the pipeline.

The novel feeding and metering system and method for semi-dry desulfurization lime hydrate provided by the invention are verified on a test bench, the metering of the lime hydrate amount is accurate, the cost is low, the installation and the maintenance are convenient, the lime hydrate amount can be controlled according to the designed proportion, and the desulfurization efficiency of the semi-dry desulfurization system is improved.

The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.

Claims

1. The utility model provides a novel semi-dry desulfurization lime feeding measurement system which characterized in that: the automatic feeding device comprises a feeding pipe, a first manual gate valve, a feeding control valve, a material reducing scale, a second manual gate valve, a variable-frequency feeder, a rotary feeder and a jet pump, wherein the first manual gate valve and the feeding control valve are sequentially installed on the front section of the material reducing scale, and the second manual gate valve, the variable-frequency feeder and the rotary feeder are sequentially connected between the material reducing scale and the jet pump.

2. The novel semi-dry desulfurized slaked lime feed metering system according to claim 1, wherein: and an expansion joint I is arranged between the feeding control valve and the material reducing scale.

3. The novel semi-dry desulfurized slaked lime feed metering system according to claim 1, wherein: and an expansion joint II is arranged between the variable frequency feeder and the rotary feeder.

4. The novel semi-dry desulfurized slaked lime feed metering system according to claim 1, wherein: and the first manual gate valve is in a normally open state.