Ammonia desulfurization device for preparing ammonium sulfite solution

Abstract

The utility model discloses an ammonia desulfurization device for preparing an ammonium sulfite solution, and belongs to the technical field of ammonia desulfurization. Comprising an ammonium sulfite preparation tower, an ammonium sulfite circulating pump, a cooling pump, a cooling circulating tank, a flue, an ammonia water pipeline, a flue gas discharge pipeline, an absorption spraying layer, a cooling spraying layer, a first branch pipe, a first return pipe, a liquid accumulation tank, a second return pipe, a desulfurization tower bottom and a second branch pipe, the absorption spraying layer is arranged at the upper part of the ammonium sulfite preparation tower, the liquid accumulation tank is positioned in the middle of the ammonium sulfite preparation tower, the cooling spraying layer is positioned below the liquid accumulation tank, the absorption spraying layer is connected with the bottom of the desulfurization tower through a second return pipe, and the cooling spraying layer is connected with the bottom of the desulfurization tower through a first branch pipe; the cooling circulation tank is connected with the cooling spraying layer through a cooling pump, and the liquid accumulation tank is connected with the cooling circulation tank through a first return pipe. According to the ammonia desulfurization device disclosed by the utility model, an existing ammonia desulfurization device is transformed into the ammonia desulfurization device capable of preparing an ammonium sulfite solution through improvement.

Description

Technical Field

[0001] The utility model relates to an ammonia desulfurization device for preparing ammonium sulfite solution, belonging to the technical field of ammonia desulfurization. Background Art

[0002] The production of ammonium sulfite generally adopts the ammonia method or the ammonium bicarbonate method.

[0003] Sulfur burns in the combustion furnace to generate SO2, which is dedusted by the dust collector, cooled by the cooler, and sent to the SO2 absorber by the blower. The ammonia water from the ammonia water tank is pumped to the ammonia water metering tank and flows into the semi-finished product circulation tank. The ammonia water is then pumped to the SO2 absorber to combine with the SO2 gas to generate ammonium sulfite solution. Through the gas-liquid separator, the liquid flows into the semi-finished product circulation tank, and the unabsorbed SO2 gas and volatile ammonia gas, etc., are absorbed by the pump circulating water through the recovery absorber to become a dilute ammonium sulfite solution. Through the gas-liquid separator, the liquid flows into the recovery circulation tank, and the tail gas is discharged through the chimney. The ammonium sulfite solution in the semi-finished product circulation tank is pumped back and forth to the SO2 absorber, where it combines with the SO2 gas sent by the blower until a nearly saturated acidic ammonium bisulfite solution (containing a small amount of (NH4)2SO3) is generated. This liquid is pumped to the neutralization tank, where it undergoes a bubbling neutralization reaction with the ammonia gas sent from the liquid ammonia bottle. When the solution becomes neutral or slightly alkaline, a supersaturated ammonium sulfite solution is generated, from which ammonium sulfite crystals are precipitated after cooling.

[0004] Ammonia desulfurization is a highly efficient, low-energy wet desulfurization method. The desulfurization process is a gas-liquid phase reaction with a fast reaction rate and high absorbent utilization rate, which can maintain a desulfurization efficiency of 95-99%.

[0005] The Chinese invention patent application CN116081646A published on May 9, 2023 discloses a method for efficiently treating ammonia desulfurization mother liquor by multi-stage oxidation, wherein a manganese dioxide catalyst is added to the ammonia desulfurization mother liquor, and then oxygen is introduced for primary oxidation to oxidize most of the ammonium sulfite in the ammonia desulfurization mother liquor. After the oxidation is completed, the manganese dioxide catalyst and the ammonia desulfurization mother liquor are filtered and separated to obtain an absorption mother liquor after oxygen oxidation; ammonium persulfate is added to the absorption mother liquor after oxygen oxidation for secondary oxidation to oxidize ammonium thiosulfate to obtain a qualified mother liquor; the qualified mother liquor is sent to the subsequent step to produce ammonium sulfate solid.

[0006] The Chinese invention patent application CN116272328A published on June 23, 2023 discloses an environmentally friendly treatment method for ammonia-based desulfurization slurry of flue gas from a coal-fired boiler, comprising the following steps: absorbent ammonia is transported to the primary spray of a desulfurization tower; water, absorbent ammonia, and sulfur dioxide in the flue gas form ammonium sulfite slurry; the ammonium sulfite slurry is input into a circulating oxidation tank and reacts with oxygen to obtain ammonium sulfate slurry, and the ammonium sulfate slurry is transported to the primary spray of the desulfurization tower through a circulating oxidation tube; the ammonium sulfate slurry output from the ammonium sulfate slurry outlet is transported to a cyclone through a first pipeline; the cyclone separates the ammonium sulfate slurry into a concentrate and transports it to a centrifuge, the centrifuge separates the solid particles in the concentrate and enters a vibrating fluidized bed for drying to obtain an ammonium sulfate product that is stored in a silo.

[0007] Therefore, in ammonia-based desulfurization, because ammonium sulfite will cause the system to produce aerosols, most ammonia-based desulfurization processes require the introduction of oxidizing air to fully oxidize the ammonium sulfite in the solution to produce by-product ammonium sulfate. The inventors of the present invention have discovered that, through improvements, the existing ammonia-based desulfurization device can be converted into an ammonia-based desulfurization device capable of preparing ammonium sulfite solution. After the conversion, firstly, the investment and land occupation of oxidation equipment and sulfuric acid preparation equipment can be saved. Secondly, the power consumption for the normal operation of environmental protection facilities can be saved, and operating costs can be saved. Finally, the produced ammonium sulfite can react with lignite and weathered coal to produce high-value-added humic acid fertilizer, offsetting the company's investment in environmental protection operating costs. Utility Model Content

[0008] The utility model aims to provide an ammonia desulfurization device for preparing ammonium sulfite solution. By improving, the existing ammonia desulfurization device is transformed into an ammonia desulfurization device capable of preparing ammonium sulfite solution. After the transformation, firstly, the investment and land occupation of oxidation equipment and sulfuric acid preparation equipment can be saved; secondly, the power consumption of normal operation of environmental protection facilities can be saved, and the operation cost can be saved; finally, the produced ammonium sulfite can react with lignite and weathered coal to generate high value-added humic acid fertilizer, which offsets the environmental protection operation cost investment of the enterprise.

[0009] In order to achieve the above purpose, the technical solution provided by the utility model is:

[0010] An ammonia desulfurization device for preparing ammonium sulfite solution, characterized in that it comprises an ammonium sulfite preparation tower, an ammonium sulfite circulation pump, a cooling pump, a cooling circulation tank, a flue, an ammonia water pipeline, a flue gas discharge pipeline, an absorption spray layer, a cooling spray layer, a first branch pipe, a first reflux pipe, a liquid accumulation tank, a second reflux pipe, a desulfurization tower bottom, and a second branch pipe; the flue is connected to the middle of the ammonium sulfite preparation tower, the absorption spray layer is arranged at the upper part of the ammonium sulfite preparation tower, the liquid accumulation tank is located in the middle of the ammonium sulfite preparation tower, the cooling spray layer is located below the liquid accumulation tank, the bottom of the desulfurization tower is connected to the ammonia water supply device through the ammonia water pipeline on the one hand, and the bottom of the desulfurization tower is connected to the absorption spray layer through the ammonium sulfite circulation pump on the other hand, the absorption spray layer is connected to the bottom of the desulfurization tower through the second reflux pipe, the cooling spray layer is connected to the bottom of the desulfurization tower through the first branch pipe, the cooling circulation tank is connected to the cooling spray layer through the cooling pump, and the liquid accumulation tank is connected to the cooling circulation tank through the first reflux pipe.

[0011] Preferably, the top of the ammonium sulfite preparation tower is connected to a process water supply device.

[0012] Preferably, the top of the cooling circulation tank is connected to a process water supply device.

[0013] Preferably, the absorption spray layer consists of two layers: a first absorption spray layer and a second absorption spray layer.

[0014] Beneficial effects:

[0015] The utility model discloses an ammonia desulfurization device for preparing ammonium sulfite solution, which transforms the existing ammonia desulfurization device into an ammonia desulfurization device capable of preparing ammonium sulfite solution through improvement. After the transformation, the investment and land occupation of oxidation equipment and sulfuric acid preparation equipment can be saved firstly, and the power consumption of normal operation of environmental protection facilities can be saved, and the operation cost can be saved. Finally, the produced ammonium sulfite can react with lignite and weathered coal to generate high-value-added humic acid fertilizer, which offsets the environmental protection operation cost investment of the enterprise.

[0016] The present invention is further described below through the accompanying drawings and specific implementation modes, but it is not intended to limit the protection scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an ammonia desulfurization device for preparing ammonium sulfite solution in Example 1 of the utility model.

[0018] Description of main reference numerals:

[0019] 1Ammonium sulfite preparation tower 2Ammonium sulfite circulation pump

[0020] 3 Cooling pump 4 Cooling circulation tank

[0021] 5 Flue 6 Ammonia Pipe

[0022] 7 Smoke exhaust pipe 8-1 First absorption spray layer

[0023] 8-2 Second absorption spray layer 9 Cooling spray layer

[0024] 10 first branch pipe 11 first reflux pipe

[0025] 12 liquid storage tank 13 second reflux pipe

[0026] 14 Desulfurization tower bottom 15 Second branch pipe DETAILED DESCRIPTION

[0027] Unless otherwise specified, in the embodiments of the present invention, the components used are conventional components available on the market in the technical field, the connections between the components are conventional connections, and the units are weight units.

[0028] Example 1

[0029] like Figure 1As shown, it is a schematic diagram of the structure of an ammonia desulfurization device for preparing ammonium sulfite solution according to Example 1 of the utility model; wherein 1 is an ammonium sulfite preparation tower, 2 is an ammonium sulfite circulation pump, 3 is a cooling pump, 4 is a cooling circulation tank, 5 is a flue, 6 is an ammonia water pipeline, 7 is a flue gas exhaust pipeline, 8-1 is a first absorption spray layer, 8-2 is a second absorption spray layer, 9 is a cooling spray layer, 10 is a first branch pipe, 11 is a first reflux pipe, 12 is a liquid accumulation tank, 13 is a second reflux pipe, 14 is the bottom of the desulfurization tower, 15 is the second branch pipe; the ammonia desulfurization device for preparing ammonium sulfite solution of Example 1 of the utility model comprises an ammonium sulfite preparation tower 1, an ammonium sulfite circulation pump 2, a cooling pump 3, a cooling circulation tank 4, a flue 5, an ammonia water pipeline 6, a flue gas exhaust pipeline 7, a first absorption spray layer 8-1, a second absorption spray layer 8-2, a cooling spray layer 9, a first branch pipe 10, a first reflux pipe 11, a liquid accumulation tank 12, a second reflux pipe 13, a desulfurization tower bottom 14, The second branch pipe 15; the flue 5 is connected to the middle of the ammonium sulfite preparation tower 1, the first absorption spray layer 8-1 and the second absorption spray layer 8-2 are arranged on the upper part of the ammonium sulfite preparation tower 1, the liquid storage tank 12 is located in the middle of the ammonium sulfite preparation tower 1, the cooling spray layer 9 is located below the liquid storage tank 12, the bottom 14 of the desulfurization tower is connected to the ammonia water supply device through the ammonia water pipeline 6 on the one hand, and the bottom 14 of the desulfurization tower is connected to the first absorption spray layer 8-1 and the second absorption spray layer 8-2 through the ammonium sulfite circulation pump 2 on the other hand. The first absorption spray layer 8-2 is connected to the desulfurization tower bottom 14 through the second reflux pipe 13, the cooling spray layer 9 is connected to the desulfurization tower bottom 14 through the first branch pipe 10, the cooling circulation tank 4 is connected to the cooling spray layer 9 through the cooling pump 3, the liquid storage tank 12 is connected to the cooling circulation tank 4 through the first reflux pipe 11, the top of the ammonium sulfite preparation tower 1 is connected to the process water supply device, and the top of the cooling circulation tank 4 is connected to the process water supply device;

[0030] The operating steps of the ammonia desulfurization device for preparing ammonium sulfite solution in Example 1 of the present utility model are as follows:

[0031] The flue gas enters the ammonium sulfite preparation tower 1 from the flue 5, and is cooled by contact with the cooling water from the cooling circulation tank 4. The cooling water is pumped into the cooling spray layer 9 through the cooling pump 3, and refluxes into the cooling circulation tank 4 through the first reflux pipe 11 to form a circulation. Part of the cooling water enters the bottom 14 of the desulfurization tower through the first branch pipe 10. The circulating liquid in the bottom 14 of the desulfurization tower is ammonia-added through the ammonia pipeline 6, and then is pumped into the first absorption spray layer 8-1 and the second absorption spray layer 8-2 through the ammonium sulfite circulation pump 2, and contacts with the cooled flue gas to generate an absorption reaction to form an ammonium sulfite solution. The ammonium sulfite solution in the upper part of the liquid accumulation tank 12 enters the bottom 14 of the desulfurization tower through the second reflux pipe 13 to form an absorption cycle and produce an ammonium sulfite solution. After circulating for a period of time, the density of the ammonium sulfite solution increases and meets the requirements, and is discharged through the second branch pipe 15. The flue gas after desulfurization and purification is discharged into the atmosphere through the flue gas exhaust pipe 7.

[0032] The utility model discloses an ammonia desulfurization device for preparing ammonium sulfite solution, which transforms the existing ammonia desulfurization device into an ammonia desulfurization device capable of preparing ammonium sulfite solution through improvement.

[0033] The above description is only a preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technician familiar with the technical field within the technical scope disclosed in the present utility model, according to the technical scheme and utility model concept or equivalent substitution or change, should be covered within the protection scope of the present utility model.

Claims

1. An ammonia desulfurization device for preparing ammonium sulfite solution, characterized in that: It includes an ammonium sulfite preparation tower, an ammonium sulfite circulation pump, a cooling pump, a cooling circulation tank, a flue, an ammonia water pipeline, a flue gas exhaust pipeline, an absorption spray layer, a cooling spray layer, a first branch pipe, a first reflux pipe, a liquid accumulation tank, a second reflux pipe, a desulfurization tower bottom, and a second branch pipe; the flue is connected to the middle part of the ammonium sulfite preparation tower, the absorption spray layer is arranged at the upper part of the ammonium sulfite preparation tower, the liquid accumulation tank is located in the middle part of the ammonium sulfite preparation tower, the cooling spray layer is located below the liquid accumulation tank, the bottom of the desulfurization tower is connected to the ammonia water supply device through the ammonia water pipeline on the one hand, and the bottom of the desulfurization tower is connected to the absorption spray layer through the ammonium sulfite circulation pump on the other hand, the absorption spray layer is connected to the bottom of the desulfurization tower through the second reflux pipe, the cooling spray layer is connected to the bottom of the desulfurization tower through the first branch pipe, the cooling circulation tank is connected to the cooling spray layer through the cooling pump, and the liquid accumulation tank is connected to the cooling circulation tank through the first reflux pipe.

2. The ammonia desulfurization device for preparing ammonium sulfite solution according to claim 1, characterized in that: The top of the ammonium sulfite preparation tower is connected to a process water supply device.

3. The ammonia desulfurization device for preparing ammonium sulfite solution according to claim 2, characterized in that: The top of the cooling circulation tank is connected to a process water supply device.

4. The ammonia desulfurization device for preparing ammonium sulfite solution according to claim 3, characterized in that: The absorption spray layer consists of two layers: a first absorption spray layer and a second absorption spray layer.

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