CN100556998C - Energy-saving sulfur-reducing dust removal concentration liquid - Google Patents

Abstract

The invention discloses an energy-saving, sulfur-reducing and dust-removing concentrated solution, which is composed of potassium permanganate, potassium perchlorate, sodium nitrate, sodium chloride, rare earth chloride, calcium carbonate, calcium oxide, magnesium carbonate, potassium dichromate, oxidized Boron and borax are used as raw materials. Calcium carbonate, magnesium carbonate, and calcium oxide are crushed into powders with a particle size of less than 1mm in advance, and then the above-mentioned components are mixed evenly, and water is added to stir evenly. The concentrated solution of the invention is mixed into coal in a certain proportion, so that the coal can be fully burned, the temperature of the furnace is increased, the thermal efficiency of the boiler is improved, energy is saved, and the emission of _SO2 and smoke is reduced.

Description

Concentrated solution for energy saving, sulfur reduction and dust removal

technical field

The invention belongs to a coal-burning additive concentrated liquid capable of fully burning coal and reducing pollutant discharge, in particular to an energy-saving, sulfur-reducing, dust-removing concentrated liquid.

Background technique

Coal is the main primary energy source in our country, but the combustion of coal is not sufficient, the efficiency of energy utilization is low, and it brings serious air pollution. At present, most of the clean utilization of coal is to pulverize coal and add solid concentrate, and then process shaped coal, which not only increases equipment, but also adds solid substances such as clay, lime, etc., which do not burn themselves and absorb heat during combustion , reduce the combustion efficiency of coal, so the effect is not ideal.

Contents of the invention

The object of the present invention is to provide an energy-saving, sulfur-reducing and dust-removing concentrated solution, which can be mixed into coal in a certain proportion so that the coal can be fully burned, the temperature of the furnace can be increased, the thermal efficiency of the boiler can be improved, energy can be saved, and emissions of SO _and smoke can be reduced.

The object of the present invention is achieved like this: a kind of energy-saving desulfurization dedusting concentrated solution is made up of following raw material weight ratio (consumption is weight part):

Potassium permanganate 0.5-2 Potassium perchlorate 2-6 Sodium nitrate 2-6

Sodium chloride 8-13 Rare earth chloride 0.2-1 Calcium carbonate 1-4

Calcium oxide 0.5-4 Magnesium carbonate 0.5-2 Potassium dichromate 0.2-1

Boron oxide 0.5-2 Borax 0.5-2 Water 70-90.

The preferred weight distribution ratio range of the formula for preparing the concentrated solution of the present invention is:

Potassium permanganate 1-1.5 Potassium perchlorate 3-5 Sodium nitrate 3-5

Sodium chloride 10-13 Rare earth chloride 0.5-1 Calcium carbonate 1.5-3.5

Calcium oxide 0.5-3.5 Magnesium carbonate 0.5-1.8 Potassium dichromate 0.5-1

Boron oxide 0.8-2 Borax 0.5-1.8 Water 73-85.

The production method that above-mentioned each component is made concentrated solution of the present invention is:

Weigh the raw materials according to the weight (parts) ratio of the above raw materials, wherein calcium carbonate, magnesium carbonate, and calcium oxide are first pulverized into powders with a particle size of less than 1mm, then the above-mentioned components are mixed uniformly, and 70-90 parts by weight of water is added to stir Evenly.

Potassium permanganate, potassium perchlorate, potassium nitrate, sodium nitrate, potassium dichromate, and boron oxide form a mixed strong oxidant, which can release oxygen and flammable substances at different temperatures during coal combustion to support combustion. Improve coal combustion efficiency. Molecular formula of potassium dichromate: K ₂ Cr ₂ O ₇ , molecular weight: 294.18. Sodium chloride, as a leavening agent, produces a "micro-explosion" phenomenon in the process of coal combustion, achieving the purpose of making coal and oxygen in good contact, accelerating the combustion speed, and making coal burn quickly, completely and thoroughly; rare earth chloride as a desulfurizer, At high temperature, the rare earth elements replaced by the rare earth chloride can react with the sulfur in the coal to play the role of sulfur fixation and desulfurization. Rare earth chloride mainly refers to the rare earth minerals mainly composed of light rare earth, which is a mixture of light rare earth chlorides obtained after alkali or acid treatment and grouping by _P204 . It contains lanthanum chloride, cerium chloride, praseodymium chloride, neodymium chloride and so on. The chemical composition of rare earth chloride is shown in Table 1.

Table 1

Calcium carbonate, calcium oxide, and magnesium carbonate prevent sulfate from decomposing to produce secondary sulfur dioxide when coal combustion reaches above 1000°C, and generate a stable phase of compound sulfate [CaMg(SO4) ₂ ], which is discharged with slag to reduce sulfur dioxide emissions .

Contrast test: the concentrated liquid mixed raw coal of the present invention and the untreated raw coal of the same composition were compared under the same combustion conditions for soot, sulfur dioxide emission concentration and emission, as shown in Table 2, Table 3, and Table 4.

1. Test methods: GB5468-91 "Test Method for Boiler Smoke and Dust", GB/T16157-1996 "Measurement of Particulate Matter in Exhaust from Stationary Pollution Sources and Sampling Method of Gaseous Pollutants".

2. Test instruments: TH880V automatic smoke tester, testo smoke tester.

3. Test location: two measuring points at the original smoke and dust discharge port of the boiler and at the outlet of the dust collector.

4. Test conditions:

Table 2 Fuel composition

Table 3 Boiler operating status

Raw coal combustion Raw coal mixed with the concentrated solution of the present invention   Boiler output steam per unit time 8.3 tons/hour 8.3 tons/hour testing time 6.5 hours 8.2 hours Coal consumption 8 tons 8 tons steam production per ton of coal 6.7 tons 8.5 tons Average furnace temperature 640°C 715°C

5. Test results

Table 4

Analysis of test results

1. From the test results, the sulfur dioxide emission rate is 15.35kg/h when raw coal is used on the chain boiler; the sulfur dioxide emission rate is 7.22kg/h when clean coal is used, a reduction of 52.9%.

2. From the test results, when raw coal is used on the chain boiler, the original soot emission rate of the boiler is 12.57kg/h: when using the raw coal added with the concentrated solution of the present invention, the original soot emission rate of the boiler is 6.04kg/h , reduced by 51.9%; the smoke and dust emission rate at the outlet of the dust collector hardly changed.

On the No. 1 WGZ-220/9.81 liquid slagging cyclone furnace of Longkou Nanshan Group Thermal Power Plant in Shandong Province, the raw coal produced by the company mixed with the concentrated solution of the present invention and the untreated raw coal of the same composition were tested under the same combustion conditions. The comparison of coal gas production and sulfur dioxide emission concentration is shown in Table 5 and Table 6.

1. Test method: The test of sulfur dioxide emission concentration is in accordance with GB5468-91 "Test Method for Boiler Smoke Dust" and GB/T16157-1996 "Measurement of Particulate Matter in Exhaust from Stationary Pollution Sources and Sampling Method of Gaseous Pollutants".

2. Test instrument: TH880V automatic smoke tester

3. Test location: the original smoke and dust discharge port of the boiler

4. Test conditions:

table 5

project raw coal Mix raw coal with concentrate Raw coal low calorific value kJ/kg 26.13 26.51 Total Sulfur % 1.5 1.5 Raw coal moisture % 6.8 8.8 Coal powder moisture % 1.33 2.32

5. Test results

Table 6

raw coal Mix raw coal with concentrate Change rate% Experiment time (h) twenty four 72 / Steam production per ton of standard coal (ton of steam/ton of standard coal) 9.7 10.47 7.9 Sulfur dioxide emission concentration (mg/m³) 3884 1947 49.8

6. Analysis of test results

1. According to the test results, the sulfur dioxide emission concentration is 3884mg/m ³ when raw coal is used in the 1#WGZ-220/9.81 liquid slagging cyclone furnace of Shandong Longkou Nanshan Group Thermal Power Plant. When the raw coal mixed with the concentrated solution of the present invention is used, the emission concentration of sulfur dioxide is 1947 mg/m ³ , which is reduced by 49.8%.

2. According to the test results, the steam production per ton of standard coal is 9.7 tons of steam per ton of standard coal when raw coal is used in the 1#WGZ-220/9.81 liquid slagging cyclone furnace of Shandong Longkou Nanshan Group Thermal Power Plant. When the raw coal mixed with the concentrated solution of the present invention is used, the steam production per ton of standard coal is 10.7 tons of steam per ton of standard coal, an increase of 7.9%.

Raw coal is added the concentrated solution of the present invention, mainly has the following characteristics when burning:

1. Change of flame temperature: After adding the concentrate, fill the flame with high-density oxygen, thereby increasing the temperature of the inner flame and the middle flame of the flame, so that the outer flame of the flame can be assisted (when no additive is added, only the external combustion, The core of the flame is black due to lack of oxygen and does not burn), so that the fuel can be burned more fully at high temperature, thereby increasing the furnace temperature by 100°C.

2. Part of the water in the coal is utilized: during normal operation, water is used as a mediator for the stable combustion of the fire bed, but it is one of the main impurities in the coal combustion. After adding the concentrate, the water in the coal evaporates after being heated. Steam, through the mixing of strong oxidant and high-temperature flue gas, instantly forms combustible gas and participates in combustion to increase heat energy.

3. The metal compounds and non-oxides in the ash are utilized: the ash in the coal is also one of the main impurities in the coal combustion. After adding the concentrated solution, through the processes of catalysis, oxidation, and bulking, the ash in the ash is made Metal compounds and non-oxides participate in combustion to increase heat energy and reduce total ash emissions by 30%.

4. The burning area density of the firebed increases: when the firebed burns, due to the fuel and mechanical characteristics, the combustion of the firebed is unstable and uneven, and the divisions of the flame are not stable. After the firebed burns, it is uneven and wastes Effective firebed area and coal combustion, after adding the concentrate, the firebed burns smoothly, and the coal combustion is benign. The burning zone expands and extends about 1/4-1/3 backwards.

5. Due to the full utilization of fixed carbon, the original combustion state is changed due to the action of the concentrate, the flame temperature is high, the fire bed is loose and fully burned, and the carbon content of the slag is reduced.

6. The expansion and looseness of the coal bed is about 1 times higher than usual. The worker said: "The coal is rising like bread."

7. The Ringelmann blackness in the flue gas is reduced. Black smoke turns white.

8. Long-term use can reduce the corrosion of the boiler system, and has a special protective effect on prolonging the service life of the equipment.

After the raw coal is added with the concentrated solution of the invention, the coal can be fully burned, the temperature of the furnace can be increased, the thermal efficiency of the boiler can be improved, energy can be saved, and the discharge of SO ₂ and smoke dust can be reduced.

Detailed ways

Example one,

Producing concentrated liquid raw material ratio of the present invention: potassium permanganate 10kg, potassium perchlorate 50kg, sodium nitrate 50kg, potassium dichromate 10kg, boron oxide 20kg, borax 10kg, sodium chloride 100kg, rare earth chloride 10kg, water 740kg, put Put into the shearing machine of rotating speed 1800 revs/min, stir; Then calcium carbonate 15kg, calcium oxide 5kg, magnesium carbonate 5kg, the powder that the particle size of pulverizing respectively is less than 1 mm is mixed, adds 75kg water, stirs, and above-mentioned The mixture is mixed and stirred for 1 hour to obtain the concentrated solution of the present invention. When spraying on coal, take 5kg of energy-saving, sulfur-reducing and dust-removing concentrate and dilute it with 200kg of water, spray it on 5000kg of coal, and test it on a 10T/hour chain boiler. The temperature of the furnace is increased by 121°C, which can reduce the smoke and dust by 51.8%. Ringer Within Manhei Level I, sulfur dioxide drops by 52.2%, and the coal saving rate reaches 21.9%.

Example two,

Produce concentrated solution raw material ratio of the present invention: potassium permanganate 15kg, potassium perchlorate 50kg, sodium nitrate 50kg, potassium dichromate 10kg, boron oxide 15kg, borax 5kg, sodium chloride 130kg, rare earth chloride 5kg, water 730kg, put Put into a shearing machine with a rotating speed of 1800 rpm, and stir; then 15kg of calcium carbonate, 15kg of calcium oxide, and 10kg of magnesium carbonate are respectively pulverized into powders with a particle size of less than 1mm, mixed, and 65kg of water is added, stirred evenly, and then mixed with the above The solution was mixed and stirred for 1 hour to obtain the concentrated solution of the present invention. When spraying coal, take 5kg of energy-saving, sulfur-reducing and dust-removing concentrate and dilute it with 200kg of water, spray it on 5000kg of coal, and test it on a 35T/hour coal throwing furnace. The temperature of the furnace is increased by 138°C, which can reduce the smoke and dust by 59.3%. Within the blackness level I, the sulfur dioxide is reduced by 65.2%, and the coal saving rate reaches 20.3%.

Claims (2)

1, a kind of energy-saving sulfur-reducing dust removal concentration liquid is characterized in that being made up of following raw material weight proportioning, and consumption is a weight part:

Potassium permanganate 0.5-2 potassium perchlorate 2-6 SODIUMNITRATE 2-6

Sodium-chlor 8-13 rare earth chloride 0.2-1 lime carbonate 1-4

Calcium oxide 0.5-4 magnesiumcarbonate 0.5-2 potassium bichromate 0.2-1

Boron oxide 0.5-2 borax 0.5-2 water 70-90, wherein: the granularity of lime carbonate, magnesiumcarbonate and calcium oxide is the powder less than 1mm.

2, energy-saving sulfur-reducing dust removal concentration liquid according to claim 1 is characterized in that wherein the weight proportion of each raw material is:

Potassium permanganate 1-1.5 potassium perchlorate 3-5 SODIUMNITRATE 3-5

Sodium-chlor 10-13 rare earth chloride 0.5-1 lime carbonate 1.5-3.5

Calcium oxide 0.5-3.5 magnesiumcarbonate 0.5-1.8 potassium bichromate 0.5-1

Boron oxide 0.8-2 borax 0.5-1.8 water 73-85.