CN110950367B

CN110950367B - Process for cooperatively producing calcium aluminate powder by using power station boiler

Info

Publication number: CN110950367B
Application number: CN201911365580.3A
Authority: CN
Inventors: 张保森
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2022-07-12
Anticipated expiration: 2039-12-26
Also published as: CN110950367A

Abstract

The invention discloses a process for producing calcium aluminate powder by using a power station boiler in a synergistic manner, which adopts a microcomputer batching device to prepare raw materials, wherein the raw materials comprise the following components in parts by weight: 50-70% of coal, 10-20% of calcium oxide and 20-30% of aluminum oxide; mixing the raw materials, conveying the mixture to a crusher (flour mill) by using a belt for crushing and milling; the crushed powdery materials are conveyed to a storage bin (a homogenizing bin) through a material conveyor; feeding the materials into a power station boiler through a boiler feeding device for combustion; and collecting the burnt fly ash into a finished product warehouse through a dust collecting device. The invention fully utilizes the characteristics of the power station boiler, and converts the fly ash into a calcium aluminate powder product on the premise of controlling the process indexes such as raw material proportion, combustion temperature and the like and not influencing power generation; greatly reduces the production cost of the calcium aluminate powder and improves the energy utilization efficiency.

Description

Process for cooperatively producing calcium aluminate powder by using power station boiler

Technical Field

The invention belongs to the technical field of preparation of calcium aluminate powder, and particularly relates to a process for cooperatively producing calcium aluminate powder by using a power station boiler.

Background

The traditional production process equipment of the calcium aluminate powder is a rotary kiln, the investment is large, the process is complex, the production period of the product is long, the energy utilization rate is low, the desulfurization and denitration cost is high, the temperature field of the rotary kiln is unstable, and the raw material has the phenomenon of overburning or undercurning.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a process for producing calcium aluminate powder by using a power station boiler in a synergistic manner.

In order to solve the technical problems, the invention adopts the following technical scheme:

a process for producing calcium aluminate powder by using a power station boiler comprises the following steps:

(1) preparing raw materials by adopting a microcomputer batching device, wherein the raw materials comprise the following components in parts by weight: 50-70% of coal, 10-20% of calcium oxide and 20-30% of aluminum oxide;

(2) mixing the raw materials, conveying the mixture to a crusher (a flour mill) by a belt for crushing and milling;

(3) the crushed powdery materials are conveyed to a storage bin (a homogenizing bin) through a material conveyor;

(4) feeding the materials into a power station boiler through a boiler feeding device for combustion;

(5) and collecting the burnt fly ash into a finished product warehouse through a dust collecting device.

The raw materials also comprise a catalyst, and the dosage of the catalyst is 1% of the total mass of the coal, the calcium oxide and the aluminum oxide.

Further, the catalyst is gypsum or iron oxide.

Further, the mixed raw materials comprise the following components in percentage by mass:Al₂O₃≥55%，CaO≤30%，MgO≤2%，Fe₂O₃≤2.0%，SiO₂≤6%。

further, the utility boiler adopts a pulverized coal boiler or a fluidized bed.

Further, when a pulverized coal boiler is adopted, the particle size of the material is controlled to be 500-1000 meshes through a powder selecting sieve of a powder preparing device; when a fluidized bed is adopted, the particle size of the material is controlled to be 0-13 mm through a crusher screen.

Further, when a pulverized coal boiler is adopted, the temperature is controlled to be 1200-1300 ℃; when the fluidized bed is adopted, the temperature is controlled to be 850-1050 ℃.

The reactions that take place in a pulverized coal boiler or a fluidized bed are as follows:

1、CaO+Al₂O₃→CaOAl₂O₃

2、CaO+2 Al₂O₃→2CaO Al₂O₃。

the invention has the beneficial effects that: 1. the above reaction takes place in the power station boiler combustion process, the main advantages are: the ultrafine powder is mixed, the contact surface is enlarged, the reaction speed is high, the temperature in the furnace is uniform, and the production process parameters are stable; 2. the characteristics of the power station boiler are fully utilized, and the fly ash is converted into a calcium aluminate powder product on the premise of well controlling the raw material ratio and the combustion temperature without influencing power generation; 3. greatly reduces the production cost of the calcium aluminate powder and improves the energy utilization efficiency. 4. The power generation process and the calcium aluminate powder production are carried out cooperatively, and the two production flows are integrated; 5. the investment is saved, the energy is saved, the consumption is reduced, the environment is protected, the emission is ultra-low, the fly ash is directly converted into the product in a recycling way, and the industrial chain is prolonged; 6. compared with the unit consumption (60 ten thousand kilocalories per ton) of the traditional product, the comprehensive energy consumption of the enterprise is reduced by more than 30 percent.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The present invention will be further described with reference to the following examples. It is to be understood that the following examples are illustrative only and are not intended to limit the scope of the invention, which is to be given numerous insubstantial modifications and adaptations by those skilled in the art based on the teachings set forth above.

Example 1 (pulverized coal boiler)

(1) preparing raw materials by adopting a microcomputer batching device, wherein the raw materials comprise the following components in parts by weight: 50-70% of coal, 10-20% of calcium oxide, 20-30% of aluminum oxide and 1% of ferric oxide;

(4) the material is subjected to powder selection by a powder selection sieve of a powder preparation device to control the particle size of the material to be 500-1000 meshes, and is fed into a pulverized coal boiler for combustion by a boiler feeding device, and the temperature is controlled to be 1200-1300 ℃;

(5) the burnt fly ash is collected by a dust collecting device and enters a finished product warehouse, and the slag is also processed into powder and then enters the finished product warehouse.

The 220t/h pulverized coal fired boiler of a certain cogeneration power station is used, and the raw materials are proportioned as follows: 62 percent of semi-coke (the calorific value of 7000 kcal/kg), 13.8 percent of limestone and 24.2 percent of aluminum ore, wherein the content of aluminum oxide is more than 54 percent, the total consumption of raw materials is 600 tons per day, the yield of the produced calcium aluminate powder is 22.5 percent, the yield per day is 135 tons, the power generation is 30 ten thousand DEG, and 1440 tons of steam for plant use are produced; the energy consumption of the product is 1.9 ten thousand kilocalories per ton.

Example 2 (Using a fluidized bed boiler)

(1) preparing raw materials by adopting a microcomputer batching device, wherein the raw materials comprise the following components in parts by weight: 50-70% of coal, 10-20% of calcium oxide, 20-30% of alumina and 1% of gypsum;

(4) controlling the particle size of the material to be 0-13 mm through a crusher screen, feeding the material into a fluidized bed through a boiler feeding device for combustion, and controlling the temperature to be 850-1050 ℃;

The method comprises the following steps of (1) utilizing a 220t/h fluidized bed boiler of a certain cogeneration power station, wherein the raw material ratio is as follows: 70 percent of semi-coke (with a heat value of 6000 kcal/kg), 14.5 percent of limestone and 25.6 percent of aluminum ore, wherein the content of aluminum oxide is more than 52 percent, the total consumption of raw materials is 800 tons every day, the yield of the produced calcium aluminate powder is 23.7 percent, the yield is 189.6 tons every day, the power generation is 35 ten thousand degrees, and 1850 tons of steam for plant use are produced; the energy consumption of the product is 2.0 ten thousand kilocalories per ton.

The combustion device adopts a pulverized coal boiler burner (CN 2009202971442), and the boiler control system adopts a power station boiler intelligent expert system (APC boiler expert system).

The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A process for producing calcium aluminate powder by using a power station boiler comprises the following steps:

(1) preparing raw materials by adopting a microcomputer batching device, wherein the raw materials comprise the following components in parts by weight: 50-70% of coal, 10-20% of calcium oxide, 20-30% of aluminum oxide and gypsum accounting for 1% of the total mass of the coal, the calcium oxide and the aluminum oxide;

(2) mixing the raw materials, conveying the mixture to a crusher by using a belt for crushing and pulverizing;

(3) conveying the crushed powdery material to a storage bin through a material conveyor;

(4) controlling the particle size of the material to be 0-13 mm through a crusher screen, feeding the material into a fluidized bed for combustion through a power station boiler feeding device, and controlling the temperature to be 850-1050 ℃;