Semi-dry desulfurization and dust removal equipment

Abstract

The utility model relates to the technical field of flue gas desulfurization equipment, in particular to semi-dry desulfurization and dust removal equipment, which comprises a semi-dry desulfurization tower and a spraying component, and the spraying component comprises a slaked lime powder bin, a first manual gate valve, a first variable-frequency star-shaped discharger, a first ejector, a first Roots blower and a water spraying component. Slaked lime powder in a slaked lime powder bin passes through a first variable-frequency star-shaped discharger, is added into the semi-dry desulfurization tower in a dry state by utilizing a high-pressure first Roots blower according to a pneumatic ash conveying principle, is humidified and activated with water mist sprayed by a water spraying component, and reacts with SO2 in flue gas in the tower; desulfurization products and fly ash in the flue gas enter the bag-type dust collector together with the flue gas to the top of the semi-dry desulfurization tower, no moving part or supporting rod piece is arranged in the semi-dry desulfurization tower, the operation gas speed is reasonable, internal abrasion is slight, no accumulation dead angle exists, the service life is long, maintenance is convenient, and new pollution sources are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas desulfurization equipment, in particular to a semi-dry desulfurization and dedusting equipment. Background Art

[0002] The semi-dry desulfurization and dedusting technology is a flue gas treatment technology between wet method and dry method, and is widely used in the flue gas desulfurization of industrial furnaces due to its advantages such as low operation cost and no generation of industrial wastewater.

[0003] The existing patent with publication number CN216223779U discloses a semi-dry desulfurization dust collector, which includes a semi-dry desulfurization absorption tower, a flue gas inlet and a flue gas outlet. The semi-dry desulfurization absorption tower further includes a guide plate, a flue gas injection system, a two-fluid spray gun, a desulfurization reaction zone and an outlet section arranged in sequence from bottom to top. There are two flue gas outlets, which are symmetrically arranged on the left and right of the outlet section of the semi-dry desulfurization absorption tower. The guide plate is arranged close to the flue gas inlet, and a dust discharging device is arranged below the flue gas inlet. The dust discharging device includes a dust accumulation hole, and a dust discharging screw is arranged directly below the dust accumulation hole. The dust discharging screw is driven to rotate by a motor, and a dust accumulation collecting hopper is arranged at the dust discharging port of the dust discharging screw, which can evenly send the flue gas with high dust concentration at the outlet of the desulfurization tower into two dust collectors arranged in parallel, ensure the uniformity of the flue gas flow field and dust concentration at the inlet of the dust collector, maximize the performance of the dust collector, and avoid the influence of the flue gas inlet on the desulfurization efficiency.

[0004] However, the above-mentioned semi-dry desulfurization dust collector is provided with support structures such as support pipes, lining base cloth, and flue gas diverter plates, which will cause ash accumulation, may become a new pollution source, and release harmful gases such as sulfur dioxide. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a semi-dry desulfurization and dedusting equipment, which solves the problem that the existing semi-dry desulfurization dust collector is provided with support structures such as support pipes, lining base cloth, and flue gas diverter plates, which will cause ash accumulation, may become a new pollution source, and release harmful gases such as sulfur dioxide.

[0006] To achieve the above purpose, the utility model provides a semi-dry desulfurization and dedusting equipment, which includes a semi-dry desulfurization tower and further includes a spray assembly;

[0007] The spray assembly includes a hydrated lime powder bin, a first manual slide valve, a first variable-frequency star feeder, a first injector, a first Roots blower, and a water spraying member. The first variable-frequency star feeder is communicated with the hydrated lime powder bin, and the first manual slide valve is arranged between the first variable-frequency star feeder and the hydrated lime powder bin. The first injector is communicated with the first variable-frequency star feeder. The first Roots blower is communicated with the first injector and is located at one end of the first Roots blower. The end of the first injector away from the first Roots blower is communicated with the semi-dry desulfurization tower, and the water spraying member is communicated with the semi-dry desulfurization tower.

[0008] Among them, the water spraying member includes a water tank, a humidifying and cooling water pump, a metal rotameter, and a magnetic flap level gauge. The water tank is respectively communicated with the two humidifying and cooling water pumps, and the two humidifying and cooling water pumps are respectively communicated with the semi-dry desulfurization tower; the metal rotameter is arranged between the humidifying and cooling water pump and the semi-dry desulfurization tower, and the magnetic flap level gauge is connected to the water tank.

[0009] Among them, the spray assembly further includes a first top bag filter and a first level gauge. The first top bag filter is connected to the hydrated lime powder bin; the first level gauge is connected to the hydrated lime powder bin.

[0010] Among them, the semi-dry desulfurization and dust removal equipment further includes a plurality of bag filters, a plurality of second injectors, and a second Roots blower. The plurality of bag filters are arranged in series in sequence. The bag filter at the head end is communicated with the semi-dry desulfurization tower, and the bag filter at the tail end is communicated with the chimney through an induced draft fan; each bag filter is connected with a second injector, and the plurality of second injectors are arranged in series in sequence; the second Roots blower is communicated with the second injector at the head end.

[0011] Among them, the semi-dry desulfurization and dust removal equipment further includes a circulating buffer bin, which is communicated with the second injector at the tail end and is communicated with the semi-dry desulfurization tower.

[0012] A semi-dry desulfurization and dust removal device of the present utility model. During desulfurization operation, after the hydrated lime powder in the hydrated lime powder silo passes through the first variable-frequency star feeder, it is added in a dry state to the semi-dry desulfurization tower by using the pneumatic ash conveying principle with the high-pressure first Roots blower, and is humidified and activated with the water mist sprayed by the water spraying component. In the tower, it reacts with SO2 in the flue gas through high-speed fluidization in the Venturi section. The desulfurization products and fly ash in the flue gas enter the bag filter at the top of the semi-dry desulfurization tower together with the flue gas for deep desulfurization and dust removal. The desulfurization products collected by the bag filter are mixed with unreacted lime powder, which is concentrated by pneumatic ash conveying into the circulating buffer silo for recycling desulfurization. There are no moving parts and support rods in the semi-dry desulfurization tower, the operating gas velocity is reasonable, the internal wear is slight, there is no accumulation dead angle, the service life is long, and the maintenance is convenient, avoiding the emergence of new pollution sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0014] Figure 1 It is a schematic diagram of the semi-dry desulfurization and dust removal device according to the first embodiment of the present utility model.

[0015] In the figure: 101 - semi-dry desulfurization tower, 102 - hydrated lime powder silo, 103 - first manual slide valve, 104 - first variable-frequency star feeder, 105 - first ejector, 106 - first Roots blower, 107 - water tank, 108 - humidifying and cooling water injection pump, 109 - metal rotor flowmeter, 110 - magnetic flap level gauge, 111 - first top bag filter, 112 - first level gauge, 113 - bag filter, 114 - second ejector, 115 - second Roots blower, 116 - circulating buffer silo. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following will describe in detail the embodiments of the present utility model. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation to the present utility model.

[0017] The first embodiment of the present application is as follows:

[0018] Please refer to Figure 1 , in which, Figure 1 It is a schematic diagram of the semi-dry desulfurization and dust removal device according to the first embodiment of the present utility model.

[0019] The utility model provides a semi-dry desulfurization and dust removal device, which comprises a semi-dry desulfurization tower 101, a spray assembly, a plurality of bag filters 113, a plurality of second ejectors 114, a second Roots blower 115 and a circulating buffer silo 116. The spray assembly comprises a hydrated lime powder silo 102, a first manual slide valve 103, a first variable-frequency star feeder 104, a first ejector 105, a first Roots blower 106, a water spraying member, a first top bag filter 111 and a first level gauge 112. The water spraying member comprises a water tank 107, a humidifying and cooling water pump 108, a metal rotameter 109 and a magnetic flap level gauge 110.

[0020] For this specific embodiment, the first variable-frequency star feeder 104 is communicated with the hydrated lime powder silo 102, the first manual slide valve 103 is arranged between the first variable-frequency star feeder 104 and the hydrated lime powder silo 102, the first ejector 105 is communicated with the first variable-frequency star feeder 104, the first Roots blower 106 is communicated with the first ejector 105 and is located at one end of the first Roots blower 106. One end of the first ejector 105 far away from the first Roots blower 106 is communicated with the semi-dry desulfurization tower 101, and the water spraying member is communicated with the semi-dry desulfurization tower 101.

[0021] The hydrated lime powder silo 102 is used for storing hydrated lime powder. The first manual slide valve 103 controls the opening and closing of the hydrated lime powder silo 102. The first variable-frequency star feeder 104 precisely controls the flow rate of the hydrated lime powder. The cooperation of the first ejector 105 and the first Roots blower 106 uses the principle of pneumatic ash conveying to add the hydrated lime powder into the semi-dry desulfurization tower 101 in a dry state. In the tower, it reacts with SO2 in the flue gas through high-speed fluidization in the Venturi section. The water spraying member sprays water mist to humidify and activate the hydrated lime powder. The feeding amount of the hydrated lime powder is controlled according to the SO2 concentration in the flue gas at the inlet and outlet of the semi-dry desulfurization tower 101 to ensure that the emission value of SO2 in the chimney exhaust gas reaches the standard.

[0022] Wherein, the water tank 107 is respectively communicated with two humidifying and cooling water pumps 108, and the two humidifying and cooling water pumps 108 are respectively communicated with the semi-dry desulfurization tower 101. The metal rotameter 109 is arranged between the humidifying and cooling water pump 108 and the semi-dry desulfurization tower 101, and the magnetic flap level gauge 110 is connected with the water tank 107.

[0023] The water tank 107 is used to store water source. The humidifying and cooling spray water pump 108 is used to generate water mist to achieve the effects of humidification and cooling. Then the water mist is transported into the semi-dry desulfurization tower 101 to humidify and activate the hydrated lime powder. The metal rotameter 109 monitors the water mist flow rate, and the magnetic flap level gauge 110 monitors the water source volume in the water tank 107. Furthermore, the electric control valve is used to control the water delivery volume and flow rate.

[0024] Secondly, the first top bag filter 111 is connected to the hydrated lime powder bin 102; the first level gauge 112 is connected to the hydrated lime powder bin 102. The first top bag filter 111 is respectively communicated with compressed air and the hydrated lime powder bin 102 to filter dust and particulate matters in the compressed air and ensure the smooth flow of the hydrated lime powder in the hydrated lime powder bin 102. The first level gauge 112 monitors the delivery volume of the hydrated lime powder and cooperates with the valve to control the feeding volume to ensure that the SO2 emission value in the chimney flue gas reaches the standard.

[0025] Meanwhile, a plurality of the bag filters 113 are arranged in series in sequence. The bag filter 113 at the head end is communicated with the semi-dry desulfurization tower 101, and the bag filter 113 at the tail end is communicated with the chimney through an induced draft fan; each of the bag filters 113 is connected with the second ejector 114, and a plurality of the second ejectors 114 are arranged in series in sequence; the second Roots blower 115 is communicated with the second ejector 114 at the head end.

[0026] The semi-dry desulfurization tower 101 and the bag filter 113 are closely connected, which is beneficial to accelerating the circulation and can also prevent the material from depositing in the horizontal connecting pipe. The desulfurization product and the fly ash in the flue gas enter the bag filter 113 at the top of the semi-dry desulfurization tower 101 along with the flue gas for deep desulfurization and dust removal. The cooperation of the second ejector 114 and the second Roots blower 115 uses the principle of pneumatic ash conveying to concentrate the desulfurization product collected by the bag filter 113, which is mixed with the unreacted lime powder completely, into the circulating buffer bin 116 for recycling desulfurization.

[0027] In addition, the circulating buffer bin 116 is communicated with the second ejector 114 at the tail end and is also communicated with the semi-dry desulfurization tower 101. The circulating buffer bin 116 has two outlets, and a manual slide valve and a variable frequency star-shaped unloader are respectively arranged at the two outlets. One outlet is communicated with the semi-dry desulfurization tower 101, and the other outlet is used for ash unloading and loading, and a bin vibrator is arranged on the surface to avoid the accumulation of dust and particulate matters.

[0028] When using a semi-dry desulfurization and dust removal device according to this embodiment, during desulfurization operation, after hydrated lime powder passes through the first variable-frequency star feeder 104, it is added to the semi-dry desulfurization tower 101 in a dry state by using the principle of pneumatic ash conveying with the high-pressure first Roots blower 106, and is humidified and activated with the sprayed water mist. In the tower, it reacts with SO2 in the flue gas through high-speed fluidization in the Venturi section. The desulfurization products and fly ash in the flue gas go to the top of the semi-dry desulfurization tower 101 along with the flue gas, and enter the bag filter 113 for deep desulfurization and dust removal. The desulfurization products collected by the bag filter 113 are mixed with unreacted lime powder, and are concentrated by pneumatic ash conveying to the circulating buffer bin 116 for recycling desulfurization. The feeding amount of hydrated lime powder is controlled according to the SO2 concentration in the flue gas at the inlet and outlet of the semi-dry desulfurization tower 101 to ensure that the emission value of SO2 in the chimney exhaust gas meets the standard. There are no moving parts and support rods in the semi-dry desulfurization tower 101, the operating gas velocity is reasonable, the internal wear is slight, there are no accumulation dead corners, the service life is long, and the maintenance is convenient. The optimal gas velocity in the tower is selected to maximize the slip velocity of the gas-solid two-phase; the solid density in the desulfurization reaction zone is high, the single-pass average residence time is long, the gas-solid contact time is up to 3 seconds, and the mixing, mass transfer, and heat transfer between the gas and solid are more rapid and sufficient, so as to achieve a higher desulfurization efficiency. The semi-dry desulfurization tower 101 and the bag filter 113 are closely connected, which is beneficial to accelerating the circulation and can also prevent the deposition of materials in the horizontal connecting pipe. It has good adaptability to the change of the inlet flue gas sulfur dioxide concentration. When the sulfur content or the required desulfurization efficiency changes, there is no need to add any process equipment, and only the consumption of the desulfurizer needs to be adjusted to meet the requirements. There are no moving parts in the semi-dry desulfurization tower 101, and there is no need to stir the gas by means of rotating machinery, and it works reliably. It is made of carbon steel, without corrosion. There are air inlet guiding facilities, ash discharge holes, manholes, and ash poking holes at the bottom of the tower, and expansion joints are provided at the inlet and outlet gas ports at both ends. At low load, the tower layer is maintained by means of clean gas reflux, there are no accumulation dead corners, the service life is long, and the maintenance is convenient, avoiding the emergence of new pollution sources.

[0029] The above-disclosed are only one or more preferred embodiments of the present application, and the scope of rights of the present application cannot be limited thereby. Those of ordinary skill in the art can understand the whole or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A semi-dry desulfurization and dust removal equipment, comprising a semi-dry desulfurization tower, characterized in that: Also included is a spray assembly; The spray assembly includes a slaked lime powder bin, a first manual gate valve, a first variable frequency star-shaped discharger, a first injector, a first Roots blower and a water spray component. The first variable frequency star-shaped discharger is connected to the slaked lime powder bin. The first manual gate valve is arranged between the first variable frequency star-shaped discharger and the slaked lime powder bin. The first injector is connected to the first variable frequency star-shaped discharger. The first Roots blower is connected to the first injector and is located at one end of the first Roots blower. The end of the first injector away from the first Roots blower is connected to the semi-dry desulfurization tower. The water spray component is connected to the semi-dry desulfurization tower.

2. The semi-dry desulfurization and dust removal equipment according to claim 1, characterized in that: The water spray component includes a water tank, a humidifying and cooling water spray pump, a metal rotor flowmeter and a magnetic flap level gauge. The water tank is respectively connected to the two humidifying and cooling water spray pumps, and the two humidifying and cooling water spray pumps are respectively connected to the semi-dry desulfurization tower; the metal rotor flowmeter is arranged between the humidifying and cooling water spray pump and the semi-dry desulfurization tower, and the magnetic flap level gauge is connected to the water tank.

3. The semi-dry desulfurization and dust removal equipment according to claim 1, characterized in that: The spray assembly also includes a first silo top bag dust collector and a first material level meter. The first silo top bag dust collector is connected to the slaked lime powder silo; the first material level meter is connected to the slaked lime powder silo.

4. The semi-dry desulfurization and dust removal equipment according to claim 1, characterized in that: The semi-dry desulfurization and dust removal equipment also includes a plurality of bag dust collectors, a plurality of second ejectors and a second Roots blower. The plurality of bag dust collectors are arranged in series in sequence. The bag dust collector at the head end is connected to the semi-dry desulfurization tower, and the bag dust collector at the tail end is connected to the chimney through an induced draft fan. Each of the bag dust collectors is connected to the second ejector, and the plurality of second ejectors are arranged in series in sequence. The second Roots blower is connected to the second ejector at the head end.

5. The semi-dry desulfurization and dust removal equipment according to claim 4, characterized in that: The semi-dry desulfurization and dust removal equipment also includes a circulating buffer silo, which is connected to the second ejector at the tail end and to the semi-dry desulfurization tower.

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