CN203349293U - Blended pulverized coal combustion controlling device - Google Patents

Abstract

The utility model discloses a blended pulverized coal combustion control device, which comprises a pulverized coal preparation system, an injection system, a combustion system, and a flue gas treatment system. The system adopts the direct tank injection process, and the combustion furnace adopts a double-chamber furnace for combustion reaction. When one furnace chamber performs combustion reaction, the flue gas enters the other furnace through the pipeline in the furnace to circulate and work, and the exhaust gas has a treatment system, the sulfur released from exhaust flue gas can be sold as a by-product of sulfur paste, without secondary pollution. The combustion efficiency of the utility model is superior to other devices for mixing coal, which is higher than 88%, and has the advantages of simple process, less equipment, and It has the characteristics of less land, low factory buildings, less construction investment, and convenient measurement. This device can also be applied to the combustion of other solid fuels.

Description

A blended pulverized coal combustion control device

technical field

The utility model relates to a control device for blending pulverized coal combustion.

Background technique

At present, my country is the largest producer and consumer of coal in the world, and it is also the only country that uses coal as its main energy source. The total amount of coal resources in Yunnan Province is 69.1 billion tons. By the end of 2006, the province's proven coal resources were 27.716 billion tons, and the predicted resources were 41.384 billion tons. Yunnan Province lacks resources. In 2005, the output of raw coal was 65.349 million tons, in 2006 it was 75.0924 million tons, in 2007 it was 80.3844 million tons, and in 2008 it was 86.5743 million tons. In 2012, the output of raw coal was 60.4 million tons, the target output was 120 million tons, the demand was 85.49 million tons, and the gap was 25.09 million tons. In 2015, the output of raw coal was 71.74 million tons, the target output was 130 million tons, the demand was 85.49 million tons, and the gap was 15.23 million tons. In 2020, the output of raw coal is 76.7 million tons, the target output is 140 million tons, the demand is 93.77 million tons, and the gap is 17.07 million tons. Among the raw coal production, lignite production accounted for 56.83%, bituminous coal accounted for 23.42%, and anthracite accounted for 19.75%. There are three major lignite coal mines in Yunnan, namely Yunnan Zhaotong Coalfield (with reserves of 8 billion tons), Yunnan Xiaolongtan Coalfield (with reserves of 1 billion tons), and Xianfeng Coalfield (with reserves of 297 million tons). The lignite is mainly in Zhaotong, Yunnan, with a coal-bearing area of 142 square kilometers. It is an earthy lignite with a moisture content of more than 40% and a thermal weight of less than 2000Kcal/kg. It is a high-humidity low-rank lignite with high sulfur, high ash, and high moisture content. , Low degree of coalification, low calorific value, low ignition point, poor thermal stability, easy weathering and spontaneous combustion.

High-quality coal is a non-renewable resource. With the growth of the economy, the consumption of coal has increased sharply. In order to reduce the cost of coal combustion, relevant research institutions and enterprises at home and abroad have used various types of coal for co-firing. The research on power coal blending is the current domestic It is one of the research hotspots at home and abroad. The most important and difficult problem is the pyrolysis and combustion of coal blending. The feasibility and effectiveness of coal blending tests are the focus of coal blending research. The research of coal blending is in grindability, pressure, There are still gaps in the atmosphere rate and other aspects, which can only be solved by obtaining the optimal control technology of coal blending combustion. Therefore, the invention of Yunnan lignite, bituminous coal and anthracite blended coal combustion optimization control technology and its device has great industrial guiding significance for the development and utilization of lignite.

At present, domestic combustion optimization control technologies commonly used include: (1) oxygen content control optimization technology; (2) closed-loop balanced combustion control system (BCCS); (3) combustion optimization control software. Among them (1) the combustion optimization control technology of oxygen content is mainly the optimization control of flue gas oxygen content. The oxygen content of the flue gas represents the combustion air-to-coal ratio, and is a key parameter for combustion efficiency and pollution emissions. The combustion efficiency has a quadratic function relationship with the oxygen content of the flue gas. On-line measurement of combustion efficiency is not possible, and the CO content and combustion efficiency in the flue gas are used as the control basis for the oxygen content of the flue gas. (2) The closed-loop balanced combustion control system (BCCS) is mainly to ensure that the total amount of fuel entering the combustion furnace is consistent with the amount of fuel required by the unit, resulting in unstable combustion, deviation of the center of the furnace flame, and coking of the water wall. (3) Combustion optimization control software has been widely used, but it has poor adaptability to changing coal types and large-scale changes in load. For the blending of Yunnan lignite with bituminous coal and anthracite, there are few research reports on its combustion characteristics, combustion optimization control technology and equipment. Therefore, it is of great significance to make full use of Yunnan lignite by rationally using coal blending and controlling the emission control technology of pollutants in the process of co-combustion to realize power coal blending and efficient and clean combustion of blended coal.

Contents of the invention

In order to realize efficient and clean combustion of power coal blending and mixed coal, the utility model provides a blended pulverized coal combustion control device. The device takes Yunnan lignite, bituminous coal, and anthracite as objects, and studies the blending of lignite, bituminous coal, and anthracite in different proportions. Coal combustion optimization control method and technology, and a complete set of coal blending combustion optimization control device has been formed.

The blended pulverized coal combustion control device includes a pulverized coal preparation system, an injection system, a combustion system, and a flue gas treatment system. After being processed by the pulverized coal preparation system, the mixed pulverized coal enters the combustion system from the injection system for blending combustion. The tail gas discharged after combustion is treated and discharged through the flue gas treatment system;

Wherein the pulverized coal preparation system includes a raw coal bunker 1, a loader 2, a raw coal meter 3, a belt conveyor 4, a coal mixing initial hopper 5, a disc feeder 6, a drying furnace 7, a steel ball coal mill 9, Primary fan 10, coarse powder separator 11, primary fine powder separator 12, secondary fine powder separator 13, circulating fan 14, bag filter 15, screw conveyor 16, impeller feeder 17, coal powder mixing bin 18. The belt conveyor 4 communicates with the raw coal bunker 1 through the raw coal meter 3 and the loader 2, the outlet of the belt conveyor 4 communicates with the inlet of the primary coal mixing bin 5, and the primary coal mixing bin 5 passes through the disk The feeder 6 transports coal powder to the drying furnace 7, and the drying furnace 7 is connected to the coarse powder separator 11 through the steel ball coal mill 9, and the coarse powder separator 11 is connected to the first-level fine powder separator 12 and the second-level fine powder separator in turn. After sieving, the mixed coal enters the mixed coal powder bin 18, and the coarse powder separator 11, the primary fine powder separator 12 and the secondary fine powder separator 13 are separated by the circulating fan 14 and the connected bag filter 15 respectively. The dust generated in the process is sent to the mixed coal powder bin 18 by the bag filter 15 through the screw conveyor 16 and the impeller feeder 17;

Described injection system comprises flexible pipe 20, injection tank I 21-1, injection tank II 21-2, forward purge valve 22, toward powder bin direction purge valve 23, flow meter 24, regulating valve 25, Roots blower I 26, automatic cut-off valve 29, safety valve 30, pulverized coal distributor 31, pulverized coal bin 18 communicates with injection tank I 21-1 and injection tank II 21-2 through hose 20, and blows Tank I and blowing tank II communicate with the pulverized coal distributor 31 through the pulverized coal delivery pipe 27. The front end of 27, the automatic cut-off valve 29 and the safety valve 30 are arranged at the rear end of the pulverized coal delivery pipe 27, the Roots blower I 26 communicates with the blowing tank I and the blowing tank II, and the pulverized coal delivery pipe 27 is connected to the ground wire 28 ;

The combustion system includes three-way valve A 32, three-way valve B 33, three-way valve C 34, automatic control valves A1-A2 35, automatic control valves B1-B2 36, automatic control valves C1-C2 37, Roots blower II 38, cooling air delivery pipeline 39, spray gun 40, Roots blower III 41, combustion air delivery pipeline 42, oxygen pump 43, combustion furnace 44, automatic ignition device 49, maintenance observation flame hole 50, platinum rhodium thermocouple 51, High-temperature flue gas flow meter 52, _O2 content measuring instrument 53-1, CO content measuring instrument 54-1, finished product warehouse 56, waste heat flue gas recycling pipeline 57; among them, the pulverized coal distributor 31 passes through the three-way valve A 32 and the automatic The control valve A1-A2 35 sprays coal powder into the spray gun 40, and the Roots blower III 41 and the oxygen pump 43 deliver the air into the combustion furnace through the three-way valve B 33, the combustion-supporting air delivery pipe 42, and the automatic control valve B1-B2 36 In 44, Roots blower II 38 provides cold air cooling spray gun 40 through three-way valve C 34, cooling air delivery pipeline 39, automatic control valve C1-C2 37, spray gun 40 is arranged on combustion furnace 44, automatic ignition device 49, maintenance observation The flame hole 50, the platinum-rhodium thermocouple 51, the high-temperature flue gas flowmeter 52, the _O2 content measuring instrument 53-1 and the CO content measuring instrument 54-1 are arranged on the combustion furnace 44, and the combustion furnace 44 communicates with the finished product warehouse 56, and the combustion The top of the furnace 44 is provided with a waste heat flue gas recycling pipeline 57, which returns to the coal powder mixing bin 18 of the injection system, and an _O2 content measuring instrument 53- 2 and a CO content measuring instrument 54-2; wherein the furnace wall of the combustion furnace 44 includes an inner wall 45, an intermediate layer 46, and an outer wall 47, and the interior of the combustion furnace 44 is divided into a hearth and a hearth B, and the two hearths are communicated through a pipeline 48 in the furnace. The bottom of the combustion furnace 44 is provided with a discharge valve 55, and the combustion furnace 44 is also connected with a distributed control system DCS, an automatic alarm device and a nitrogen system;

The flue gas treatment system includes a flue gas discharge pipe 59 connected to the combustion system. A three-way valve 58, a flue gas pipe thermometer 60, and a fly ash carbon content detector 61 are arranged on the flue gas discharge pipe 59. The flue gas passes through the flue gas The gas discharge pipe 59 enters the serpentine condenser 62, and the serpentine condenser 62 communicates with the dust collector 64 through the induced draft fan 163. on pipe 59;

The load condition of the pulverized coal conveying pipeline used in this device is ≥15m/s, and the load condition of the horizontal pipeline is ≥25m/s. The delivery pipelines of the device are all connected by steel pipelines, and the connections between the pipelines and between the pipelines and the valves are connected with screws.

The drying oven 7 described in the utility model is provided with a thermometer 8 .

In the utility model, a powder bin depth display rod 19 is arranged on the mixed coal powder bin 18 . Spray gun 40 is installed in the position of 1/3～1/2 apart from the top of the combustion furnace.

The desulfurization system described in the utility model includes induced draft fan II 66, bypass baffle 67, booster fan 68, heat exchanger 69, outlet baffle 70, chimney 71, absorption tower 72, demister 73, circulation fan 74 , limestone bin 75, limestone mill 76, slurry tank 77, liquid pump 78, fan 79, slurry pump 80, water cyclone I 81, vacuum belt filter 82, intermediate storage tank 83, water cyclone The device II 84, the induced draft fan II 66 are connected to the heat exchanger 69 through the booster fan 68, and the heat exchanger 69 is connected to the absorption tower 72. The flue gas discharged from the absorption tower 72 enters the heat exchanger 69 through the demister 73, and then passes through the outlet block. The plate 70 enters the chimney 71 and is discharged; the circulation fan 74 is arranged on the absorption tower 72, the limestone bin 75 is connected with the slurry tank 77 through the limestone mill 76, and the slurry tank 77 is connected with the absorption tower 72 by the liquid pump 78, and the slurry discharge pump 80 passes through The fan 79 is connected to the absorption tower 72, and the slurry discharge pump 80 is connected to the intermediate storage tank 83 through the hydrocyclone I 81 and the vacuum belt filter 82. The upper part of the intermediate storage tank 83 is connected to the absorption tower 72, and the lower part is connected to the hydrocyclone II 84, the bypass baffle 67 communicates with the induced draft fan II and the chimney 71.

The inner wall 45 of the combustion furnace 44 described in the utility model is a refractory brick, the middle layer 46 of the combustion furnace is a 150mm aluminum silicate fiber insulation layer, and the outer wall 47 of the combustion furnace is cement.

The use method of the utility model blending pulverized coal combustion control device, the method steps are as follows:

(1) Prepare mixed coal raw materials. The mixed coal raw materials include lignite with a mass percentage of 10% to 35%, bituminous coal with a mass percentage of 40% to 80%, and anthracite with a mass percentage of 10% to 35%. The total cycle is 380Kg to 430kg, The mixed coal raw materials are dried in the drying furnace of the coal powder preparation system, and the moisture content is ≤8%, and the mixed coal is ground after drying to obtain mixed coal powder with a particle size of 60-120 μm and a temperature of ≤70°C;

(2) The mixed pulverized coal enters the injection tank of the injection system from the mixed pulverized coal warehouse of the pulverized coal preparation system. When the pressure of the injection tank is > 10kPa, the injection starts, and the pulverized coal and gas are distributed to the in the combustion system;

(3) The pulverized coal is burned in the combustion system, the excess air coefficient is 1.05~1.36, the combustion temperature is 750°C~1150°C, the pressure of the pulverized coal conveying air is 30KPa~98KPa, the pressure of the combustion air is 20KPa~98KPa, the spray gun is cooled The wind pressure is 20Kpa～98Kpa, the air flow rate of pulverized coal conveying is 0.28m ³ /s～87 m ³ /s, the flow rate of combustion air is 1 m ³ /s～16.67m ³ /s, and the flow rate of cooling air is 0.28 m ³ /s～0.8 m ³ /s, the stable power of the plasma auto-ignition magnetic field is 50KPa～150KPa, the pulverized coal is switched every 650s～820s in the combustion furnace, and the heat is recycled after combustion. The pressure of the combustion furnace is 10KPa～30KPa, the combustion furnace The flue gas outlet temperature is 50-250°C, and the temperature inside the two furnaces of the combustion furnace is 600-1150°C. After combustion, the exhaust gas is purified through the flue gas treatment system, and acid gases such as SO ₂ in the flue gas are removed by the limestone-gypsum method, so that Smoke emission up to standard.

The specific process adopted by the utility model device is as follows: (1) Load the coal from the raw coal bunker 1 through the loader 2, and use the raw coal meter 3 to weigh lignite, bituminous coal, and anthracite according to the designed ratio (lignite: 10% to 35% %, bituminous coal: 40% to 80%, anthracite 10% to 35%), the total amount of the cycle is 380Kg to 430kg, which is sent to the primary coal mixing bin 5 by the belt conveyor 4, and is fed to the drying furnace 7 by the disc feeder 6 Medium-heating coal powder is dried until the mixed coal moisture is ≤8%. At this time, the temperature of the drying furnace is controlled to be ≤150°C (the lowest temperature for spontaneous combustion of coal powder), and the dried mixed coal enters the steel ball coal mill 9 to be ground into Coal powder needs to be mixed, the outlet particle size is 60-120μm, and the temperature is ≤70°C. The mixed coal powder is pumped by the primary fan 10 to the coarse powder separator 11, the first-stage fine powder separator 12, and the second-stage fine powder separator 13 for three stages. After screening, the mixed coal with a particle size in the range of 80-120 μm enters the mixed coal powder bin 18, and the mixed coal particles larger than 120 μm are sent back to the steel ball coal mill 9; the coarse powder separator 11, the primary fine powder separation The dust generated during the separation process of the filter 12 and the secondary fine powder separator 13 is pumped to the bag filter 15 by the circulating fan 14. The bag is made of an anti-static filter bag, and the coal powder of the bag filter is cleaned every day. The conveyor 16 and the impeller feeder 17 are sent into the mixed coal powder bin 18; the load condition of the pulverized coal conveying pipeline is ≥15m/s, and the load condition of the horizontal pipeline is ≥25m/s.

(2) There is a powder bin depth display rod 19 in the pulverized coal bin 18, and its depth indicates the weight of the remaining pulverized coal in the pulverized coal bin 18. The pulverized coal passes through the pulverized coal bin 18 under the action of gravity. The pipe 20 enters the blowing tank, and the Roots blower I 26 is used to increase the blowing pressure of the blowing tank. When the pressure of the blowing tank is > 10kPa, the blowing starts. The blowing tank I (21-1), the blowing tank II (21- 2) When one of them is spraying, the other blowing tank is used for depressurization, powder filling, and pressure filling. The blowing tank I (21-1) and the blowing tank II (21-2) are used alternately, going round and round, in order The cycle is completed; the forward purge valve 22, the purge valve 23, the flowmeter 24, and the regulating valve 25 are arranged on the front end of the pulverized coal delivery pipe 27, and the purge valve 22 purges the pulverized coal forward to The function of purge valve 23 in the direction of the powder bin is to purge the pulverized coal in the direction of the powder bin. The function of the valve 23 is to clean up the remaining coal in the pipeline after the injection is stopped, and the gas-powder mixture blown back toward the powder bin enters the mixed coal powder bin through the pulverized coal conveying pipe; in order to prevent static electricity, connect the pulverized coal conveying pipe 27 to the ground The line 28 has a resistance≯100Ω, and the connectors are connected with conductors. The radius of the elbow on the pulverized coal conveying pipeline should be 10 to 15 times the diameter of the conveying pipe to reduce pressure loss and pipe wall wear, and reduce conveying failures caused by elbow blockage. The length of the horizontal straight pipe of the pulverized coal delivery pipeline should be greater than 5m as much as possible to avoid blockage of the elbow; the automatic shut-off valve 29 and the safety valve 30 are installed at the rear end of the pulverized coal delivery pipe 27, and the automatic shut-off valve 29 is used to cut off the spray when the system fails. The pulverized coal of the blowing system enters the combustion system, and the safety valve 30 plays a dual protective role; ~10 spray guns, 10-20 in total).

(3) Three-way valve A 32, three-way valve B 33, three-way valve C 34, automatic control valve A1-A2 35, automatic control valve B1-B2 36, automatic control valve C1-C2 37 are used to control pulverized coal, Conveying of combustion-supporting air and cooling air; the pulverized coal in the pulverized coal distributor 31 sprays the pulverized coal into the spray gun 40 through the three-way valve A32, the pulverized coal delivery pipeline 27, and the automatic control valve A1-A2 35; wherein the pulverized coal delivery pipeline passes through The three-way valve A 32 is divided into two branch pipes, and the pulverized coal enters the spray gun 40 from the branch pipe to the furnace A of the combustion furnace for combustion. After the combustion is completed, the coal powder enters the spray gun through the switching three-way valve A 32 to burn in the furnace B; start the Roots blower 41 and add Oxygen pump 43 provides the air needed for combustion according to the requirement of excess air coefficient (1.05~1.36), and controls the air entering furnace A of combustion furnace 44 through three-way valve B 33, combustion-supporting air delivery pipe 42, and automatic control valve B1-B2 36 Among them, the pipeline setting is the same as that of pulverized coal transportation, and the entry time is synchronized with pulverized coal; from the perspective of safety, Roots blower II 38 provides cooling air through three-way valve C 34, cooling air delivery pipeline 39, and automatic control valve C1-C2 37 Used for cooling the spray gun 40, the spray gun 40 is made of heat-resistant seamless steel pipe with a diameter of 15-25 mm, the pipeline setting is the same as that of pulverized coal transportation, and the entry time is synchronized with pulverized coal, and the three-way valve C34 is set at the end of the cooling air transmission pipeline 39 , the spray gun 40 is arranged on the same circumference of the combustion furnace 44 from the top 1/3~1/2; The three-way valve B 33 and the three-way valve C 34 respectively pass into the furnace A of the combustion furnace 44. The combustion furnace 44 is used as a combustion chamber and filled with materials that need to be heated by high-temperature flue gas. When the coal undergoes a combustion reaction, the flue gas after combustion enters the furnace B to preheat the materials in the furnace B through the pipeline in the furnace; after a certain period of reaction, the combustion reaction furnace is switched, that is, the pulverized coal is burned in the furnace B, and the combustion flue gas enters the furnace A Preheat the material in the furnace A, switch the furnace A to the furnace B every 650s~820s; the lower part of the combustion furnace is the burned material and the produced product;

After pulverized coal and air enter the combustion furnace, under the conditions of direct current>200A and medium pressure>0.01MPa, the cathode and anode in the automatic ignition device 49 contact the arc and obtain stable power (50~ 150KPa) DC air plasma and automatic ignition; the maintenance observation flame hole 50 is opened at 1/2 of the distance from the furnace top of the combustion furnace, with a diameter of φ40-80, made of high-temperature-resistant multi-layer transparent composite material, and can rotate Open. Use platinum-rhodium thermocouple 51 to measure the combustion flue gas temperature in combustion furnace 44, and control the amount of pulverized coal entering furnace A or furnace B (each furnace load is 340Kg-450Kg) and air-fuel ratio (1.05-1.36), so that the combustion temperature Stable in the range of 750°C to 1150°C, so that the mixed coal can be fully burned to reach the maximum combustion heat, and high-temperature flue gas can be provided; The _O2 content measuring instrument 53-1 and the CO content measuring instrument 54-1 in the system respectively measure the _O2 content and CO content in the combustion furnace, and the measured _O2 content and CO content are sent to the DCS system for control to achieve optimal combustion; Roots blower 42 and oxygen pump 43 make the combustion system fully combustible under the optimal value and safe value, and the products produced in the combustion furnace after combustion are discharged through the ash discharge valve 55 and then enter the finished product bin 56; the discharge valve 55 every 650s ~ 720s unloading to the finished product warehouse 56; the decentralized control system DCS optimizes the control of the entire combustion system by collecting various data, and the automatic alarm system gives an alarm when the system fails or there is an explosion, and then starts the nitrogen system Nitrogen is introduced, and the nitrogen system is also used to prepare the atmosphere for inerting the pulverized coal system cleaning and equipment maintenance. The waste heat flue gas generated by the combustion of materials in the combustion furnace 44 enters the mixed coal powder bin 18 in the injection system to preheat the mixed coal (waste heat recovery); the _O2 content measuring instrument in the system 53-2. The CO content measuring instrument 54-2 respectively measures the O ₂ content and the CO content of the waste heat recycling pipeline 57.

When the materials to be processed and the mixed coal are added to the furnace A of the combustion furnace for combustion reaction, the flue gas generated by the combustion passes through the three-way valve on the flue gas pipeline, so that the flue gas enters the furnace B of the combustion furnace from the channel 48 in the furnace to preheat the materials; the reaction After the end, switch the combustion reaction furnace, that is, the combustion of pulverized coal is carried out in the combustion furnace furnace B, and the flue gas enters the combustion furnace A to preheat the materials, and the materials to be processed in the furnace are continuously fed according to the different materials; from the top of the furnace Add the materials to be processed, the middle part of the combustion furnace is the combustion chamber, the lower part of the furnace stores the processed materials, and the spray gun is located at 1/3~1/2 of the height of the combustion furnace 44 from the top. the

(4) After combustion, the flue gas enters the flue gas treatment program through the three-way valve 58 and the flue gas discharge pipe 59, and the flue gas discharge pipe 59 arranged on the top of the combustion furnace 44 is merged into a flue gas discharge main pipe through the three-way valve 58. A flue gas pipe thermometer 60 and a fly ash carbon content meter 61 are installed on the flue gas discharge pipe 59 to measure the flue gas temperature and fly ash carbon content, and the flue gas is cooled by a serpentine condenser 62, and the cooled flue gas passes through The flue gas online monitor 63 detects the flue gas composition, and the flue gas is sent to the dust collector 64 by the induced draft fan 163 for dust removal treatment. The flue gas after dedusting is carried out desulfurization treatment, and wherein bypass baffle plate 67 is that when the technological treatment of induced draft fan II 66 breaks down, flue gas directly enters chimney 71 from bypass baffle plate 67; The booster fan 68 increases the pressure of the flue gas, and then enters the heat exchanger 69 for heat exchange so that the flue gas temperature reaches 40°C-60°C and enters the absorption tower 72. The pH of the absorption tower 72 is controlled between 4.8-5.8, and the saturation of the lime slurry It is between 1.25 and 1.3. The crystallization temperature of gypsum is controlled at 40°C to 60°C. The flue gas discharged from the absorption tower 72 is demistered in the demister 73 and enters the heat exchanger 69 for heat exchange. The flue gas temperature is 20°C to 40°C and then passes through the outlet. Plate 70 enters chimney 71 for discharge. The circulation fan 74 circulates the wind in the absorption tower 72 . The limestone raw material is ground from the limestone bin 75 to the limestone mill 76 and enters the slurry tank 77 for processing, and is sent to the absorption tower 72 by the liquid pump 78; the function of the fan 79 is to extract the air needed by the absorption tower. Calculate the theoretical required air volume according to the sulfite content, and then multiply by the empirical coefficient, which is 1.8 to 2.5. The slurry after the absorption tower 72 absorbs and processes is sent into the hydrocyclone 1 81 by the slurry discharge pump 80 and enters the vacuum belt filter 82 to filter. Hydrocyclone I 81 dehydrates gypsum to 40%, then dehydrates to less than 10% with vacuum belt filter 82, and the moisture that comes out is returned to intermediate storage tank 83. The clear upper layer of water in the intermediate storage tank 83 is sent to the absorption tower, and the lower layer of wastewater is treated after passing through the hydrocyclone II 84. The water after wastewater treatment is recycled, and the desulfurized sulfur paste can be sold as a by-product .

The desulfurization reaction principle of the utility model is as follows:

Advantage and technical effect of the present utility model are as follows:

1. The device uses mixed coal for combustion, and the volatile matter in the mixed coal will be precipitated earlier. Compared with the single coal, the heat generated by the volatile matter will preheat the pulverized coal and the materials to be processed first, and promote the coke in the pulverized coal. The combustion is more complete and the combustion efficiency is improved; the flue gas in the kiln is discharged through the flue gas in the middle channel, and there is a process of heat recovery and utilization, which makes the thermal efficiency higher, which is superior to other devices, and its combustion efficiency is greater than 88%;

2. It can make the mixed coal powder burn in the high-temperature area, and the internal temperature is smooth and uniform. The heating coverage of the heated body in the furnace is large, and the combustion efficiency is high. The double furnace can further use the waste heat of the high-temperature flue gas to reduce the temperature of the outlet flue gas. The purpose of energy saving and emission reduction;

3. It is easy to ignite, heat up quickly, and requires low coal quality. The entire combustion process is in a normal pressure state, easy to operate, good in stability, and high in safety; Adjust the furnace temperature and flame length within a certain range to meet actual needs;

4. The sulfur released from the flue gas can be sold as a by-product of sulfur paste;

5. This device has the characteristics of simple process, less equipment, less land occupation, low workshop building, less construction investment, convenient measurement, etc. It can also be applied to other solid fuel combustion.

Description of drawings

Fig. 1 is the utility model device structural representation;

Fig. 2 is the structural representation of the utility model pulverized coal preparation system;

Fig. 3 is a structural schematic diagram of the blowing system of the utility model;

Fig. 4 is a structural schematic diagram of the utility model combustion system;

Fig. 5 is a schematic structural diagram of the flue gas treatment system of the present invention;

Fig. 6 is the furnace structure diagram of the utility model;

In the figure: 1-raw coal bunker, 2-loader, 3-raw coal measuring instrument, 4-belt conveyor, 5-primary coal mixing bin, 6-disk feeder, 7-drying furnace, 8-thermometer, 9-steel Ball coal mill, 10-primary fan, 11-coarse powder separator, 12-first-level fine powder separator, 13-secondary fine powder separator, 14-circulation fan, 15-bag filter, 16-screw transport Machine, 17-impeller feeder, 18-coal powder mixing bin, 19-powder bin depth display rod, 20-hose, 21-1-injection tank I, 21-2-injection tank II, 22-direction Front purge valve, 23-purge valve in the direction of the powder bin, 24-flow meter, 25-regulating valve, 26-Roots blower I, 27-coal powder delivery pipe, 28-ground wire, 29-automatic shut-off valve, 30-safety valve, 31 pulverized coal distributor, 32-three-way valve A, 33-three-way valve B, 34-three-way valve C, 35-automatic control valve A1-A2, 36-automatic control valve B1-B2, 37-Automatic control valve C1-C2, 38-Roots blower II, 39-Cooling air pipeline, 40-Spray gun, 41-Roots blower III, 42-Combustion air pipeline, 43-Oxygen pump, 44-Combustion Furnace, 45-inner wall, 46-middle layer, 47-outside, 48-inner furnace pipe, 49-automatic ignition device, 50-maintenance observation flame hole, 51-platinum rhodium thermocouple, 52-high temperature flue gas flow meter, 53 -1- _O2 content tester, 54-1-CO content tester, 53-2- _O2 content tester, 54-2-CO content tester, 55-unloading valve, 56-finished product warehouse, 57- Waste heat flue gas reuse pipe, 58-three-way valve, 59-flue gas discharge pipe, 60-flue gas pipe thermometer, 61-fly ash carbon content tester, 62-serpentine condenser, 63-induced fan I, 64-dust collector, 65-on-line flue gas monitoring, 66-induced fan II, 67-bypass baffle, 68-booster fan, 69-heat exchanger, 70-exit baffle, 71-chimney, 72-absorption Tower, 73-demister, 74-circulation fan, 75-limestone bin, 76-limestone mill, 77-slurry tank, 78-liquid pump, 79-fan, 80-slurry pump, 81-water cyclone Device I, 82-vacuum belt filter, 83-intermediate storage tank, 84-water cyclone II.

Detailed ways

The utility model is described further below by accompanying drawings and embodiments, but the protection scope of the utility model is not limited to the described content.

Example 1: The combustion control device for blending Yunnan lignite, bituminous coal and anthracite includes a pulverized coal preparation system, an injection system, a combustion system, and a flue gas treatment system. The mixed pulverized coal is processed by the pulverized coal preparation system and then injected The system enters the combustion system for blending combustion, and the exhaust gas discharged after combustion is treated and discharged by the flue gas treatment system;

Wherein the pulverized coal preparation system includes a raw coal bunker 1, a loader 2, a raw coal meter 3, a belt conveyor 4, a coal mixing initial hopper 5, a disc feeder 6, a drying furnace 7, a steel ball coal mill 9, Primary fan 10, coarse powder separator 11, primary fine powder separator 12, secondary fine powder separator 13, circulating fan 14, bag filter 15, screw conveyor 16, impeller feeder 17, coal powder mixing bin 18. The belt conveyor 4 is connected through the raw coal metering 3, the loader 2, and the raw coal bunker 1, and the outlet of the belt conveyor 4 is connected with the inlet of the primary coal mixing bin 5, and the primary coal mixing bin 5 is fed through a disc. The feeder 6 transports coal powder to the drying furnace 7, and the drying furnace 7 is connected to the coarse powder separator 11 through the steel ball coal mill 9, and the coarse powder separator 11 is connected to the first-level fine powder separator 12 and the second-level fine powder separator in turn 13. After sieving, the mixed coal enters the mixed coal powder bin 18, and at the same time, the coarse powder separator 11, the first-level fine powder separator 12 and the second-level fine powder separator 13 pass through the circulating fan 14 and the connected bag filter 15 respectively to complete the separation process. The dust generated in the coal mill is sent to the mixed coal powder bin 18 by the bag filter 15 through the screw conveyor 16 and the impeller feeder 17; the drying furnace 7 is equipped with a thermometer 8; the specification model of the steel ball coal mill is Ф2100×4500, and the output is 8～43 (t/h), output granularity: 0.074～0.4 (mm) (discharge granularity of ball mill); disc feeder specification model 1000, feeding capacity 4.2～22 (m ² /h). The conveying pipeline is made of steel, and the mixed coal pulverized coal has an appropriate particle size and is evenly mixed.

Described blowing system comprises the flexible pipe 20 that communicates with coal powder bin 18, blowing tank I 21-1, blowing tank II 21-2, forward purge valve 22, toward powder bin direction purge valve 23, flow rate Meter 24, regulating valve 25, Roots blower I 26, automatic cut-off valve 29, safety valve 30, pulverized coal distributor 31, wherein the mixed pulverized coal bin 18 passes through the hose 20 and the injection tank I 21-1, the injection tank II 21-2 communication, the injection tank I and the injection tank II are communicated with the pulverized coal distributor 31 through the pulverized coal delivery pipe 27, the forward purge valve 22, the purge valve 23 toward the powder bin, the flow meter 24 and the The regulating valve 25 is arranged on the front end of the pulverized coal delivery pipe 27, the automatic cut-off valve 29 and the safety valve 30 are arranged on the rear end of the pulverized coal delivery pipe 27, and the Roots blower I 26 communicates with the injection tank I and the injection tank II, and the coal The pulverized coal conveying pipe 27 is connected to the ground wire 28; the pulverized coal mixing bin 18 is provided with a powder bin depth display rod 19;

The combustion system includes three-way valve A 32, three-way valve B 33, three-way valve C 34, automatic control valves A1-A2 35, automatic control valves B1-B2 36, automatic control valves C1-C2 37, Roots blower II 38, cooling air delivery pipeline 39, spray gun 40, Roots blower III 41, combustion air delivery pipeline 42, oxygen pump 43, combustion furnace 44, automatic ignition device 49, maintenance observation flame hole 50, platinum rhodium thermocouple 51, High-temperature flue gas flow meter 52, _O2 content measuring instrument 53-1, CO content measuring instrument 54-1, finished product warehouse 56, waste heat flue gas recycling pipeline 57; among them, the pulverized coal distributor 31 passes through the three-way valve A 32 and the automatic The control valve A1-A2 35 sprays coal powder into the spray gun 40, and the Roots blower III 41 and the oxygen pump 43 deliver the air into the combustion furnace through the three-way valve B 33, the combustion-supporting air delivery pipe 42, and the automatic control valve B1-B2 36 In 44, Roots blower II 38 provides cold air cooling spray gun 40 through three-way valve C 34, cooling air delivery pipeline 39, automatic control valve C1-C2 37, spray gun 40 is arranged on combustion furnace 44, automatic ignition device 49, maintenance observation The flame hole 50, the platinum-rhodium thermocouple 51, the high-temperature flue gas flowmeter 52, the _O2 content measuring instrument 53-1 and the CO content measuring instrument 54-1 are arranged on the combustion furnace 44, and the combustion furnace 44 communicates with the finished product warehouse 56, and the combustion The top of the furnace 44 is provided with a waste heat flue gas recycling pipeline 57, which returns to the coal powder mixing bin 18 of the injection system, and an _O2 content measuring instrument 53- 2 and a CO content measuring instrument 54-2; wherein the furnace wall of the combustion furnace 44 includes an inner wall 45, an intermediate layer 46, and an outer wall 47, and the interior of the combustion furnace 44 is divided into a hearth and a hearth B, and the two hearths are communicated through a pipeline 48 in the furnace. The bottom of the combustion furnace 44 is provided with a discharge valve 55, and the combustion furnace 44 is also connected with a distributed control system DCS, an automatic alarm device and a nitrogen system; Aluminum fiber insulation layer, the outer wall 47 is cement; the pressure of the combustion-supporting air is 29.87KPa, and the model of the Roots blower is L82WD-A Roots blower. The air pressure of spray gun cooling air is 38KPa. The model of the Roots blower is RRE-150 Roots blower, the design height of the combustion furnace is 15.5m, and the inner diameter is 3m.

The flue gas treatment system includes a flue gas discharge pipe 59 connected to the combustion system. A three-way valve 58, a flue gas pipe thermometer 60, and a fly ash carbon content detector 61 are arranged on the flue gas discharge pipe 59. The flue gas passes through the flue gas The gas discharge pipe 59 enters the serpentine condenser 62, and the serpentine condenser 62 communicates with the dust collector 64 through the induced draft fan 163. On the pipeline 59; wherein the desulfurization system includes induced draft fan II 66, bypass baffle 67, booster fan 68, heat exchanger 69, outlet baffle 70, chimney 71, absorption tower 72, mist eliminator 73, circulation fan 74, Limestone bin 75, limestone mill 76, slurry tank 77, liquid pump 78, fan 79, slurry discharge pump 80, water cyclone I 81, vacuum belt filter 82, intermediate storage tank 83, water cyclone II 84, induced draft fan II 66 is connected to heat exchanger 69 through booster fan 68, heat exchanger 69 is connected to absorption tower 72, and the flue gas discharged from absorption tower 72 enters heat exchanger 69 through demister 73, and then passes through the outlet baffle 70 enters the chimney 71 and discharges; the circulation fan 74 is arranged on the absorption tower 72, the limestone bin 75 is connected with the slurry tank 77 through the limestone mill 76, and the slurry tank 77 is communicated with the absorption tower 72 by the liquid pump 78, and the slurry discharge pump 80 passes the fan 79 is connected to the absorption tower 72, and the slurry discharge pump 80 is connected to the intermediate storage tank 83 through the hydrocyclone I 81 and the vacuum belt filter 82. The upper part of the intermediate storage tank 83 is connected to the absorption tower 72, and the lower part is connected to the hydrocyclone II 84 , the bypass baffle 67 communicates with the induced draft fan II and the chimney 71 (see Figure 1-6).

The load condition of the pulverized coal conveying pipeline used in this device is 15m/s, and the load condition of the horizontal pipeline is 25m/s. Use GB/T 213-2008 (coal calorific value measurement standard) to measure the heat of mixed coal, and measure the flue gas temperature with flue gas on-line monitoring to obtain the heat released by the actual reaction. The combustion efficiency is 91%.

When using this device, the mixed coal raw material is first prepared. The mixed coal raw material includes lignite with a mass percentage of 35%, bituminous coal with a mass percentage of 40%, and anthracite with a mass percentage of 25%. The time is 600s, the delayed combustion time is 60s, and the furnace switching time is 20s), the mixed coal raw material is dried in the drying furnace of the pulverized coal preparation system, and the water content is 6%. ≤70℃ mixed pulverized coal; the mixed pulverized coal enters the injection tank of the injection system from the mixed coal powder bin of the coal powder preparation system. When the pressure of the injection tank is 20kPa, the injection starts, and the coal powder and gas pass through the coal The powder distributor is distributed to the combustion system;

The pulverized coal is burned in the combustion system, the air excess coefficient is 1.2, and the required air volume is 2769m ³ , which is transported into the furnace by a Roots fan. Kpa, the air pressure of the combustion air is 29.87 Kpa, and the air pressure of the spray gun cooling air is 38Kpa. The air flow rate of pulverized coal conveying is 0.7 m ³ /s, the air flow rate of combustion-supporting air is 2.87 m ³ /s, the air flow rate of spray gun cooling is 0.67 m ³ /s, the stable power of plasma auto-ignition magnetic field is 100KPa, and the pulverized coal is in the combustion furnace every 680s The combustion furnace is switched once, and the heat is recycled after combustion. The pressure of the combustion furnace is 12KPa, the temperature of the flue gas outlet of the combustion furnace is 90°C, and the temperature inside the two furnaces of the combustion furnace is 850°C. - The gypsum method removes acid gases such as SO ₂ in the flue gas, so that the flue gas can be discharged up to the standard.

After the combustion is stable, the temperature measured at the measuring hole on the device by a platinum-rhodium thermocouple is 985°C.

The flow rate of high temperature flue gas measured by the high temperature flue gas flowmeter is 2300 m ³ (680s), or 3.38 m ³ /s, the combustion efficiency is 91%, and the lime production is 2350 Kg (680s), or 300t/d.

After the flue gas exits from the exhaust outlet, the flue gas enters the tail gas treatment system, and the volume of flue gas treated is 11.67 m ³ /h (mainly for the purification of sulfur). The lime consumption is 26.03 kg/h, and the oxygen demand is 16.36 m ³ /h. The tail gas volume to be treated is 11.67 m ³ /h, and the by-product sulfur paste is 63.3 kg/h, which can be sold; after purification by this system, the SO ₂ emission concentration is 51.27 mg/m ³ , which meets the relevant national emission standards and environmental protection requirements.

Embodiment 2 : The device structure of this embodiment is the same as that of Embodiment 1, the difference is that the specification and model of the steel ball coal mill is Ф2700×4500, output: 12～90 (t/h), output granularity: 0.074～0.4 (mm), round The specification model of the pan feeder is 1000, and the feeding capacity is 4.2-22 (m ² /h). The conveying pipeline is made of steel, and the mixed coal pulverized coal has an appropriate particle size and is evenly mixed.

When using the device of this embodiment, the mixed coal raw material is prepared. The mixed coal raw material includes lignite with a mass percentage of 20%, bituminous coal with a mass percentage of 45%, and anthracite with a mass percentage of 35%. (The coal supply time is 620s, the delayed combustion time is 80s, and the furnace switching time is 20s). After drying in the drying furnace of the pulverized coal preparation system, the mixed coal raw material has a moisture content of 5%. The particle size is 100μm, and the temperature is ≤70°C; the mixed pulverized coal enters the injection tank of the injection system from the coal powder mixing bin of the pulverized coal preparation system. When the pressure of the injection tank is 20kPa, the injection starts, and the pulverized coal and gas Distributed to the combustion system through the pulverized coal distributor;

The pulverized coal is burned in the combustion system, the air excess coefficient is 1.25, and the required air volume is 3137m ³ , which is transported into the furnace by a Roots blower. The speed of pulverized coal transport is controlled at 0.71kg/s, and the air pressure of the pulverized coal transport is 63.53 Kpa, combustion-supporting air pressure 21 Kpa, spray gun cooling air pressure 38Kpa, pulverized coal conveying air flow rate 0.8 m ³ /s, combustion-supporting air flow rate 3.09 m ³ /s, spray gun cooling air volume 0.67 m ³ /s, The stable power of the plasma automatic ignition magnetic field is 150KPa. The pulverized coal is switched every 720s in the combustion furnace, and the heat is recycled after combustion. The pressure of the combustion furnace is 30KPa. The temperature of the channel is 600°C, and the exhaust gas after combustion is purified through the flue gas treatment system, and acid gases such as SO ₂ in the flue gas are removed through the limestone-gypsum method, so that the flue gas can be discharged up to the standard.

After the combustion is stable, use a platinum-rhodium thermocouple to measure the temperature at the maintenance and flame measuring hole to 925°C, use GB/T 213-2008 (coal calorific value measurement standard) to measure the heat of mixed coal, and use flue gas online monitoring to measure flue gas The temperature is the heat released by the actual reaction, and its combustion efficiency is 89%.

The flow rate of high-temperature flue gas measured by the high-temperature flue gas flow rate is 2093.4 m ³ (720s), that is, 2.9 m ³ /s, and the combustion efficiency is 89%. Lime output is 2350 Kg (720s), that is 280t/d.

The treated tail gas volume is 12.1 m ³ /h (mainly sulfur purification), the lime consumption is 27.1kg/h, and the oxygen demand is 17.02 m ³ /h. The tail gas volume to be treated is 11.67 m ³ /h, and the by-product sulfur paste is 69.6 kg/h, which can be sold; after purification by this system, the SO ₂ emission concentration is 55.25 mg/m ³ , which meets the relevant national emission standards and environmental protection requirements.

Embodiment 3: The structure of the device in this embodiment is the same as that in Embodiment 1, except that the steel ball coal mill is GZM2135Ф2100×3500, output: 4.5-33 (t/h), and output granularity: 0.074-0.6 (mm). Disc feeder specification model 1000, feeding capacity 4.2 ~ 22 (m ² /h), conveying pipes are made of steel, mixed coal powdered coal particle size is appropriate and mixed evenly.

When using the device of this embodiment, the mixed coal raw material is prepared. The mixed coal raw material includes lignite with a mass percentage of 10%, bituminous coal with a mass percentage of 80%, and anthracite with a mass percentage of 10%. (The coal supply time is 550s, the delayed combustion time is 80s, and the furnace switching time is 20s). After drying in the drying furnace of the pulverized coal preparation system, the mixed coal raw material has a moisture content of 4%. The particle size is 60 μm, and the temperature is ≤70°C; the mixed coal powder enters the injection tank of the injection system from the coal powder mixing bin of the coal powder preparation system. When the pressure of the injection tank is 15kPa, the injection starts, and the coal powder and gas Distributed to the combustion system through the pulverized coal distributor;

The pulverized coal is burned in the combustion system, the excess air coefficient is 1.15, and the required air volume is 2585.7m ³ , which is transported into the furnace by a Roots blower. 57.85Kpa, combustion-supporting air pressure 25.62 Kpa, spray gun cooling air pressure 38Kpa, pulverized coal conveying air flow rate 0.65 m ³ /s, combustion-supporting air flow rate 2.85 m ³ /s, spray gun cooling air volume 0.67 m ³ /s, The stable power of the plasma auto-ignition magnetic field is 50KPa, the pulverized coal is switched every 650s in the combustion furnace, and the heat is recovered and utilized after combustion. The temperature is 1000°C. After combustion, the exhaust gas is purified by the flue gas treatment system, and acid gases such as SO ₂ in the flue gas are removed by the limestone-gypsum method, so that the flue gas can be discharged up to the standard.

After the combustion is stable, use a platinum-rhodium thermocouple to measure the temperature at the maintenance and flame measuring hole at 1005°C, use GB/T 213-2008 (the standard for measuring the calorific value of coal) to measure the heat of mixed coal, and use the flue gas online monitoring to measure the flue gas The heat released by the actual reaction is obtained at the temperature, and its combustion efficiency is 92%.

The high-temperature flue gas flow meter measures the flow rate of high-temperature flue gas to 2279 m ³ (650s), that is, 3.51 m ³ /s, and the combustion efficiency is 92%. Lime output is 2350 Kg (720s), that is 310t/d.

The treated tail gas volume is 14.12 m ³ /h (mainly sulfur purification), the lime consumption is 25.6kg/h, and the oxygen demand is 7.37 m ³ /h. The tail gas volume to be treated is 11.67 m ³ /h, and the by-product sulfur paste is 66 kg/h, which can be sold; after purification by this system, the SO ₂ emission concentration is 50.02 mg/m ³ , which meets the relevant national emission standards and environmental protection requirements.

Claims (6)

1. a blend coal dust firing control device, it is characterized in that: it comprises coal dust preparation system, injection system, combustion system, smoke processing system, coal dust preparation system is communicated with combustion system by injection system, and combustion system is communicated with smoke processing system and processes emission;

Described coal dust preparation system comprises belt feeder (4), mixed coal is feed bin (5) just, disk feeder (6), drying oven (7), steel ball coal mill (9), primary air fan (10), mill separator (11), one-level pulverized-coal collector (12), secondary pulverized-coal collector (13), circulating fan (14), sack cleaner (15), spiral shell fortune machine (16), impeller dispenser (17), mixed Pulverized Coal Bin (18), described belt feeder (4) is communicated with run coal bin by loading machine, belt feeder (4) discharging opening is communicated with the charging aperture of the first feed bin (5) of mixed coal, mixed coal just feed bin (5) passes through disk feeder (6) to drying oven (7) pulverized coal conveying, drying oven (7) is communicated with mill separator (11) by steel ball coal mill (9), connect successively one-level pulverized-coal collector (12) and secondary pulverized-coal collector (13) after mill separator (11), after screening, mixed coal enters mixed Pulverized Coal Bin (18), simultaneously mill separator (11), one-level pulverized-coal collector (12) and secondary pulverized-coal collector (13) are respectively by circulating fan (14), be communicated with sack cleaner (15) dust produced in separation process is transported to machine (16) by sack cleaner (15) through spiral shell, impeller dispenser (17) is sent into mixed Pulverized Coal Bin (18),

Described injection system comprises the flexible pipe (20) that is communicated with mixed Pulverized Coal Bin (18), winding-up tank I(21-1), winding-up tank II(21-2), blow down valve (22) forward, to powder storehouse direction blow down valve (23), flowmeter (24), control valve (25), roots blower I(26), automatic stop valve (29), safety valve (30), pulverized coal distributor (31), wherein mixed Pulverized Coal Bin (18) is by flexible pipe (20) and winding-up tank I(21-1), winding-up tank II(21-2) be communicated with, winding-up tank I and winding-up tank II are by coal dust carrier pipe (27), with pulverized coal distributor (31), be communicated with, blow down valve (22) forward, to powder storehouse direction blow down valve (23), flowmeter (24) and control valve (25) are arranged on the front end of coal dust carrier pipe (27), automatic stop valve (29), safety valve (30) is arranged on coal dust carrier pipe I(27) rear end, roots blower I(26) with winding-up tank I and winding-up tank II, be communicated with, coal dust carrier pipe (27) access ground wire (28),

Described combustion system comprises triple valve A(32), triple valve B(33), triple valve C(34), autocontrol valve A1-A2(35), autocontrol valve B1-B2(36), autocontrol valve C1-C2(37), roots blower II(38), cooling air conveyance conduit (39), spray gun (40), roots blower III(41), combustion air conveyance conduit (42), oxygen pump (43), combustion furnace (44), automatic ignition device (49), maintenance observation glory hole (50), platinum rhodium thermocouple (51), high-temperature flue gas flowmeter (52), O ₂content meter (53-1), CO content meter (54-1), finished bin (56), waste heat flue gas reuse pipeline (57), wherein pulverized coal distributor (31) is through triple valve A(32) and autocontrol valve A1-A2(35) by coal dust spirt spray gun (40), roots blower III(41) and oxygen pump (43) by triple valve B(33), combustion air conveyance conduit (42), autocontrol valve B1-B2(36) air is delivered in combustion furnace (44), roots blower II(38) by triple valve C(34), cooling air conveyance conduit (39), autocontrol valve C1-C2(37) provide the cooling spray gun of cold air (40), spray gun (40) is arranged on combustion furnace (44), automatic ignition device (49), maintenance observation glory hole (50), platinum rhodium thermocouple (51), high-temperature flue gas flowmeter (52), O ₂content meter (53-1) and CO content meter (54-1) are arranged on combustion furnace (44), combustion furnace (44) is communicated with finished bin (56), combustion furnace (44) top is provided with waste heat flue gas reuse pipeline (57), the mixed Pulverized Coal Bin (18) of injection system is led in its time, at waste heat flue gas reuse pipe end, near mixed Pulverized Coal Bin place, O is housed ₂content meter (53-2) and CO content meter (54-2), wherein the furnace wall of combustion furnace (44) comprises inwall (45), intermediate layer (46), outer wall (47), combustion furnace (44) inside is divided into A burner hearth and B burner hearth, two burner hearths are communicated with by stove interior conduit (48), and combustion furnace (44) bottom is provided with discharge valve (55),

Described smoke processing system comprises the flue gas exhausting pipe line (59) be connected with combustion system, be provided with triple valve (58), flue thermometer (60), unburned carbon in flue dust analyzer (61) on flue gas exhausting pipe line (59), flue gas enters coil condenser (62) by flue gas exhausting pipe line (59), coil condenser (62) is by air-introduced machine I(63) with deduster (64), be communicated with, it is upper that desulphurization system is connected to deduster (64), and smoke gas on-line monitor (65) is arranged on flue gas exhausting pipe line (59);

Load condition >=the 15m/s of power transportation pipe used in this device, the load condition >=25m/s of horizontal pipe.

2. blend coal dust firing control device according to claim 1, is characterized in that: be provided with thermometer (8) on drying oven (7).

3. blend coal dust firing control device according to claim 1, is characterized in that: be provided with powder storehouse Depth display bar (19) on mixed Pulverized Coal Bin (18).

4. blend coal dust firing control device according to claim 1, it is characterized in that: spray gun (40) is arranged on apart from the position at combustion furnace top 1/3 ~ 1/2.

5. blend coal dust firing control device according to claim 1, it is characterized in that: desulphurization system comprises air-introduced machine II(66), by-pass damper (67), booster fan (68), heat exchanger (69), outlet damper (70), chimney (71), absorption tower (72), demister (73), circulating fan (74), lime stone storehouse (75), lime stone grinding machine (76), slurry tank (77), liquor pump (78), blower fan (79), slurry pump (80), cyclone I(81 in water), vacuum band-type filter machine (82), middle storage tank (83), cyclone II(84 in water), air-introduced machine II(66) connect heat exchanger (69) by booster fan (68), heat exchanger (69) connects absorption tower (72), the flue gas that discharge on absorption tower (72) enters heat exchanger (69) through demister (73), pass through again outlet damper (70) and enter chimney (71) discharge, circulating fan (74) is arranged on absorption tower (72), lime stone storehouse (75) is connected with slurry tank (77) by lime stone grinding machine (76), slurry tank (77) is communicated with absorption tower (72) by liquor pump (78) again, slurry pump (80) connects by blower fan (79) absorption tower (72), slurry pump (80) is by cyclone I(81 in water), storage tank (83) in the middle of vacuum band-type filter machine (82) connects, middle connection absorption tower, storage tank (83) top (72), bottom connects cyclone II(84 in water), by-pass damper (67) is communicated with air-introduced machine II and chimney.

6. blend coal dust firing control device according to claim 1, it is characterized in that: the inwall (45) of combustion furnace (44) is refractory brick, the alumina silicate fibre heat-insulation layer that combustion furnace intermediate layer (46) are 150mm, combustion furnace outer wall (47) is cement.

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