Coal ash pulping backfilling system

Abstract

The utility model discloses a coal ash slurrying backfill system, relates to the technical field of coal ash recovery equipment, and mainly aims to provide the coal ash slurrying backfill system for recovering coal ash by using flue gas waste heat and carbon dioxide as acid sources. According to the main technical scheme, the fly ash slurrying backfilling system comprises a collecting part, a boiler part and a dust remover, the bottom of the boiler part and the dust remover are connected to an ash storage tank, and the side face of the boiler part is connected to the dust remover; the side surfaces of the desulfurization tower are respectively connected to the dust remover and the condenser, and the water storage tank is connected to the bottom of the condenser; the two ends of a feeding pipeline are connected to the pulping reactor and the ash storage tank respectively, the two ends of a second feeding pipeline are connected to the pulping reactor and the condenser respectively, the two ends of a first water inlet pipeline are connected to the water storage tank and the pulping reactor respectively, and one end of a smoke exhaust pipeline is connected to the top of the pulping reactor. The fly ash treatment device is mainly used for treating fly ash.

Description

Technical Field

[0001] The utility model relates to the technical field of fly ash recovery equipment, in particular to a fly ash slurry backfilling system. Background Art

[0002] my country's electric energy is mainly coal. Every year, coal-fired power plants produce 600 million tons of fly ash, accounting for about half of the world's total production. However, the current comprehensive utilization rate is only 70%. Although this ratio is comparable to the world average, my country still faces many challenges in the comprehensive utilization of fly ash due to its huge production and uneven geographical distribution. With the shrinking demand and seasonal fluctuations in the traditional building materials market, coal-fired power plants are widely distributed and the demand in the building materials industry has weakened, resulting in the comprehensive utilization rate of fly ash in the western region being far lower than the national average. At the same time, the treatment of the large amount of fly ash generated by power plants in the west has become a problem. The local building materials market cannot absorb it, and long-distance transportation has increased costs, so most of them can only choose to landfill.

[0003] There is a coal-fired power plant flue gas condensate neutralizing fly ash slurry filling system with China Publication No. CN220026961U, which includes a power plant desulfurization tower, a clean flue gas condensation mechanism connected to the power plant desulfurization tower, a flue gas outlet of the clean flue gas condensation mechanism connected to a chimney, a flue gas condensate outlet of the clean flue gas condensation mechanism connected to a flue gas condensate pool, and a flue gas condensate pool connected to a reaction mechanism. It solves the problem of insufficient fly ash processing capacity in power plants and low degree of fly ash resource utilization in power plants, and achieves positive results in the resource utilization of fly ash underground filling.

[0004] However, the process energy consumption of the fly ash pulping filling system in the flue gas condensate water of coal-fired power plants is large, as it reduces the flue gas outlet temperature through the clean flue gas condensation mechanism and obtains the fly ash pulping condensate water. In addition, simply relying on the white flue gas wastewater (pH value of about 3) produced after wet desulfurization to neutralize the strongly alkaline fly ash (pH value of about 11) is not enough to prepare a high solid-liquid ratio backfill slurry. A new acid source must be added, thereby increasing the recovery cost. Utility Model Content

[0005] In view of this, an embodiment of the utility model provides a fly ash slurry backfilling system, the main purpose of which is to provide a fly ash slurry backfilling system that utilizes flue gas waste heat and carbon dioxide as acid sources to recycle fly ash.

[0006] In order to achieve the above purpose, the utility model mainly provides the following technical solutions:

[0007] The utility model provides a fly ash slurry backfilling system, which includes:

[0008] A collecting component, the collecting component comprises a boiler component, a dust collector and an ash storage tank, the bottoms of the boiler component and the dust collector are connected to the ash storage tank, and the side of the boiler component is connected to the dust collector;

[0009] A treatment component, the treatment component comprises a desulfurization tower, a condenser and a water storage tank, the sides of the desulfurization tower are respectively connected to the dust collector and the condenser, and the water storage tank is connected to the bottom of the condenser;

[0010] A pulping component, the pulping component includes a pulping reactor, a first feed pipe, a second feed pipe, a first water inlet pipe and a smoke exhaust pipe, the two ends of the feed pipe are respectively connected to the pulping reactor and the ash storage tank, the two ends of the second feed pipe are respectively connected to the pulping reactor and the condenser, the two ends of the first water inlet pipe are respectively connected to the water storage tank and the pulping reactor, and one end of the smoke exhaust pipe is connected to the top of the pulping reactor.

[0011] Furthermore, the boiler component has a nozzle and a flue, and the dust collector, the nozzle and the flue are respectively connected to the ash storage tank.

[0012] Furthermore, the processing component also includes a smoke exhaust component, and the condenser and the other end of the smoke exhaust pipe are connected to the smoke exhaust component.

[0013] Furthermore, the pulping component also includes a powder pump and a powder flow valve, and the powder pump and the powder flow valve are arranged on the first feed pipeline.

[0014] Furthermore, the pulping component also includes a condensate water pump and a condensate water flow valve, and the condensate water pump and the condensate water flow valve are arranged on the first water inlet pipe.

[0015] Furthermore, the pulping component also includes a white smoke elimination pump and a white smoke elimination flow valve, and the white smoke elimination pump and the white smoke elimination flow valve are arranged on the second feed pipeline.

[0016] Furthermore, a discharge pipe is provided, one end of which is connected to the pulping reactor, and the other end of which is connected to the mine.

[0017] Compared with the prior art, the utility model has the following technical effects:

[0018] In the technical solution provided by the embodiment of the utility model, the function of the collecting component is to collect fly ash, and the collecting component includes a boiler component, a dust collector and an ash storage tank, the bottoms of the boiler component and the dust collector are connected to the ash storage tank, and the side of the boiler component is connected to the dust collector; the function of the processing component is to perform whitening treatment on the generated flue gas, and the processing component includes a desulfurization tower, a condenser and a water storage tank, the sides of the desulfurization tower are respectively connected to the dust collector and the condenser, and the water storage tank is connected to the bottom of the condenser; the function of the pulping component is to make slurry, and the pulping component includes a pulping reactor, a first feed pipe, a second feed pipe, a first water inlet pipe and a smoke exhaust pipe, the two ends of the feed pipe are respectively connected to the pulping reactor and the ash storage tank, the two ends of the second feed pipe are respectively connected to the pulping reactor and the condenser, the two ends of the first water inlet pipe are respectively connected to the water storage tank and the pulping reactor, and one end of the smoke exhaust pipe is connected to the top of the pulping reactor. Compared with the prior art, by The clean flue gas condensation mechanism reduces the flue gas factory temperature and obtains fly ash pulping condensate water, which consumes a lot of process energy. In addition, simply relying on the white flue gas wastewater (pH value of about 3) generated after wet desulfurization to neutralize the strongly alkaline fly ash (pH value of about 11) is not enough to prepare a high solid-liquid ratio backfill slurry. A new acid source must be added, thereby increasing the cost of recovery. In this technical solution, the white flue gas is introduced into the pulping reactor to increase the temperature in the pulping reactor, so that the soluble alkali in the acetic acid fly ash is dissolved faster, and the neutralization reaction rate is accelerated, thereby increasing the high solid-liquid ratio pulping rate. Moreover, the flue gas is used as a disturbance medium in the pulping reactor to prevent and alleviate the formation of coal powder agglomerates and reduce the mechanical stirring intensity. At the same time, the carbon dioxide in the flue gas is used as an acid source, and the carbon dioxide is introduced into the water to form carbonic acid. The carbonic acid reacts with the alkaline oxide of the fly ash in the water to fix the carbon dioxide, thereby reducing the emission of carbon dioxide. Not only can the waste heat be fully utilized, but also the cost of fly ash treatment can be reduced, thereby achieving the technical effect of reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A structural schematic diagram of a fly ash slurry backfilling system provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0020] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1 As shown, the embodiment of the utility model provides a fly ash slurry backfilling system, the system comprising:

[0022] A collecting component, the collecting component includes a boiler component 11, a dust collector 12 and an ash storage tank 13, the bottoms of the boiler component 11 and the dust collector 12 are connected to the ash storage tank 13, and the side of the boiler component 11 is connected to the dust collector 12;

[0023] The processing part includes a desulfurization tower 21, a condenser 22 and a water storage tank 23. The sides of the desulfurization tower 21 are respectively connected to the dust collector 12 and the condenser 22, and the water storage tank 23 is connected to the bottom of the condenser 22;

[0024] The pulping components include a pulping reactor 31, a first feed pipe 32, a second feed pipe 34, a first water inlet pipe 33 and a smoke exhaust pipe 35. The two ends of the feed pipe are respectively connected to the pulping reactor 31 and the ash storage tank 13, the two ends of the second feed pipe 34 are respectively connected to the pulping reactor 31 and the condenser 22, the two ends of the first water inlet pipe 33 are respectively connected to the water storage tank 23 and the pulping reactor 31, and one end of the smoke exhaust pipe 35 is connected to the top of the pulping reactor 31.

[0025] In the technical solution provided by the embodiment of the utility model, the function of the collecting component is to collect fly ash, and the collecting component includes a boiler component 11, a dust collector 12 and an ash storage tank 13. The bottoms of the boiler component 11 and the dust collector 12 are connected to the ash storage tank 13, and the side of the boiler component 11 is connected to the dust collector 12; the function of the processing component is to perform whitening treatment on the generated flue gas, and the processing component includes a desulfurization tower 21, a condenser 22 and a water storage tank 23. The side of the desulfurization tower 21 is respectively connected to the dust collector 12 and the condenser 22, and the water storage tank 23 is connected to the condenser 2 2; the pulping component is used to make pulp, and the pulping component includes a pulping reactor 31, a first feed pipe 32, a second feed pipe 34, a first water inlet pipe 33 and a smoke exhaust pipe 35. The two ends of the feed pipe are respectively connected to the pulping reactor 31 and the ash storage tank 13, the two ends of the second feed pipe 34 are respectively connected to the pulping reactor 31 and the condenser 22, the two ends of the first water inlet pipe 33 are respectively connected to the water storage tank 23 and the pulping reactor 31, and one end of the smoke exhaust pipe 35 is connected to the top of the pulping reactor 31. Compared with the existing Technology, the process of reducing the flue gas factory temperature through the clean flue gas condensation mechanism and obtaining fly ash pulping condensate water consumes a lot of energy. In addition, simply relying on the white flue gas wastewater (pH value of about 3) produced after wet desulfurization to neutralize the strongly alkaline fly ash (pH value of about 11) is not enough to prepare a high solid-liquid ratio backfill slurry. A new acid source must be added, thereby increasing the cost of recycling. In this technical solution, the white flue gas is introduced into the pulping reactor 31 to increase the temperature in the pulping reactor 31, and the soluble alkali in the acetic acid fly ash is dissolved faster. At the same time, the neutralization reaction rate is accelerated, and the high solid-liquid ratio pulping rate is improved. In addition, the flue gas is used as a disturbing medium in the pulping reactor 31, which can prevent and alleviate the formation of coal powder agglomerates and reduce the mechanical stirring intensity. At the same time, the carbon dioxide in the flue gas is used as an acid source, and the carbon dioxide is introduced into water to form carbonic acid. The carbonic acid reacts with the alkaline oxide of fly ash in water to fix the carbon dioxide, thereby reducing the emission of carbon dioxide. It can not only make full use of the waste heat, but also reduce the cost of fly ash treatment, thereby achieving the technical effect of reducing production costs.

[0026] The function of the above-mentioned collecting component is to collect fly ash. The collecting component includes a boiler component 11, a dust collector 12 and an ash storage tank 13. The bottoms of the boiler component 11 and the dust collector 12 are connected to the ash storage tank 13. The side of the boiler component 11 is connected to the dust collector 12. The bottom of the boiler component 11 is provided with a nozzle 14, which is connected to the ash storage tank 13 and can transport the fly ash to the ash storage tank 13. The lower part of the horizontal flue 15 of the boiler component 11 is connected to the ash storage tank 13, and the fly ash in the horizontal flue 15 can be transported to the ash storage tank 13. The exhaust end of the boiler component 11 is connected to the dust collector 12. The exhaust gas is filtered by the dust collector 12 after being discharged from the exhaust end, and the filtered fly ash enters the ash storage through the lower part of the dust collector 12. The processing component is used to perform whitening treatment on the generated flue gas. The processing component includes a desulfurization tower 21, a condenser 22 and a water storage tank 23. The sides of the desulfurization tower 21 are respectively connected to the dust collector 12 and the condenser 22. The water storage tank 23 is connected to the bottom of the condenser 22. The gas after dust removal enters the desulfurization tower 21 for desulfurization treatment. The treated gas enters the condenser 22 to be cooled to form whitening flue gas, and most of the whitening flue gas is discharged. Optionally, the processing component also includes a smoke exhaust component 24. The other end of the condenser 22 and the smoke exhaust pipe 35 is connected to the smoke exhaust component 24. The smoke exhaust component 24 is a chimney. Most of the whitening gas is discharged from the chimney into the atmosphere, and a small part of the whitening gas is discharged through the first inlet. The gas component enters the pulping reactor 31, and the whitening gas contains part of the waste heat of the flue gas, which can enter the pulping reactor 31, increase the temperature in the pulping reactor 31, and the soluble alkali in the acetic acid fly ash is dissolved faster, while accelerating the neutralization reaction rate, and improving the high solid-liquid ratio pulping rate. In addition, the flue gas, as a disturbance medium in the pulping reactor 31, can prevent and alleviate the formation of coal powder agglomerates and reduce the mechanical stirring intensity. The cooled carbon dioxide enters the water storage tank 23 from the condenser 22 and reacts with water to form carbonic acid, and then the carbonic acid enters the pulping reactor 31 through the second feeding pipe 34; the function of the pulping component is to make slurry, and the pulping component includes the pulping reactor 31, the first feeding pipe 32, and the first feeding pipe 34. Two feed pipes 34, a first water inlet pipe 33 and a smoke exhaust pipe 35, both ends of the feed pipe are respectively connected to the pulping reactor 31 and the ash storage tank 13, both ends of the second feed pipe 34 are respectively connected to the pulping reactor 31 and the condenser 22, both ends of the first water inlet pipe 33 are respectively connected to the water storage tank 23 and the pulping reactor 31, one end of the smoke exhaust pipe 35 is connected to the top of the pulping reactor 31, the first feed pipe 32 passes the fly ash in the ash storage tank 13 into the pulping reactor 31, so that the fly ash, carbonic acid and white smoke react in the pulping reactor 31, which can not only make full use of the waste heat, but also reduce the cost of fly ash treatment, thereby achieving the technical effect of reducing production costs.

[0027] Furthermore, the pulping component further includes a powder pump 41 and a powder flow valve 42, and the powder pump 41 and the powder flow valve 42 are arranged on the first feed pipe 32. In the present embodiment, the pulping component is further defined, the powder pump 41 and the powder flow valve 42 are arranged on the first feed pipe 32, the powder pump 41 is arranged at a position close to the boiler component 11, and the powder flow valve 42 is arranged at an end of the powder pump 41 away from the boiler component 11, and can adjust the feed amount of the powder, optionally, the pulping component further includes a condensate pump 43 and a condensate flow valve 44, and the condensate pump 43 and the condensate flow valve 44 are arranged on the first water inlet pipe 33, the pulping component further includes a white smoke pump 45 and a white smoke flow valve 46, and the white smoke pump 45 and the white smoke flow valve 46 are arranged on the second feed pipe 34, the condensate pump 43 is arranged at one end close to the cooler, and the condensate flow valve 4 4 is arranged at the end of the condensate pump 43 away from the cooler, and can control the flow of condensate. The white smoke flow valve 46 is arranged at the end close to the pulping reactor 31. The white smoke pump 45 is arranged at the end of the white smoke flow valve 46 away from the pulping reactor 31. By arranging the powder flow valve 42, the condensate flow valve 44 and the white smoke flow valve 46, a wide range of solid-liquid ratio backfill slurry can be configured according to the soluble alkaline oxide content of fly ash and the backfill demand. Optionally, a discharge pipe is added, one end of the discharge pipe is connected to the pulping reactor 31, and the other end is connected to the mine. The slurry made by the pulping reactor 31 is directly transported to the mine through the discharge pipe, thereby achieving the technical effect of convenient transportation of the slurry.

[0028] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A fly ash slurry backfilling system, characterized in that: include: A collecting component, the collecting component comprises a boiler component, a dust collector and an ash storage tank, the bottoms of the boiler component and the dust collector are connected to the ash storage tank, and the side of the boiler component is connected to the dust collector; A treatment component, the treatment component comprises a desulfurization tower, a condenser and a water storage tank, the sides of the desulfurization tower are respectively connected to the dust collector and the condenser, and the water storage tank is connected to the bottom of the condenser; A pulping component, the pulping component includes a pulping reactor, a first feed pipe, a second feed pipe, a first water inlet pipe and a smoke exhaust pipe, the two ends of the feed pipe are respectively connected to the pulping reactor and the ash storage tank, the two ends of the second feed pipe are respectively connected to the pulping reactor and the condenser, the two ends of the first water inlet pipe are respectively connected to the water storage tank and the pulping reactor, and one end of the smoke exhaust pipe is connected to the top of the pulping reactor.

2. A fly ash slurry backfilling system according to claim 1, characterized in that: The boiler component has a nozzle and a flue, and the dust collector, the nozzle and the flue are respectively connected to the ash storage tank.

3. The fly ash slurry backfilling system according to claim 1, characterized in that: The processing component further includes a smoke exhaust component, and the condenser and the other end of the smoke exhaust pipe are connected to the smoke exhaust component.

4. The fly ash slurry backfilling system according to claim 1, characterized in that: The pulping component further includes a powder pump and a powder flow valve, and the powder pump and the powder flow valve are arranged on the first feed pipeline.

5. A fly ash slurry backfilling system according to claim 4, characterized in that: The pulping component further includes a condensate water pump and a condensate water flow valve, and the condensate water pump and the condensate water flow valve are arranged on the first water inlet pipe.

6. A fly ash slurry backfilling system according to claim 5, characterized in that: The pulping component further includes a smoke elimination pump and a smoke elimination flow valve, and the smoke elimination pump and the smoke elimination flow valve are arranged on the second feed pipeline.

7. A fly ash slurry backfilling system according to any one of claims 1 to 6, characterized in that: Also includes: A discharge pipe, one end of which is connected to the pulping reactor, and the other end of which is connected to the mine.

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