CN115727677A - An energy-saving lime production system and production method - Google Patents

Abstract

The application discloses an energy-saving lime production system and a production method, wherein a lime kiln of the system is provided with an upper gas absorption beam, an upper combustion beam and a lower combustion beam; the combustion-supporting fan is connected with a cold source inlet of the air heat exchanger, and a cold source outlet of the air heat exchanger is connected with air inlets of the upper combustion beam and the lower combustion beam; one path of the outlet of the upper air suction beam is connected with the inlet of the air heat exchanger, the outlet of the air heat exchanger is connected with the inlet of the hot water heat exchanger, the other path of the outlet of the upper air suction beam is connected with the inlet of the gas heat exchanger, and the outlet of the gas heat exchanger is connected with the inlet of the hot water heat exchanger; the outlet of the fuel system is connected with the cold source inlet of the gas heat exchanger, and the cold source outlet of the gas heat exchanger is respectively connected with the gas inlets of the upper combustion beam and the lower combustion beam; the air outlet of the cooling fan is connected with the cooling air inlet at the lower part of the lime kiln. The method solves the problems that in the prior art, due to the low energy utilization rate of the lime kiln, the lime kiln cannot reach the designed capacity and the coal gas consumption is high.

Description

An energy-saving lime production system and production method

technical field

The application belongs to the technical field of lime production, and in particular relates to an energy-saving lime production system and production method.

Background technique

Lime kilns are divided into beam kilns, double-chamber kilns, rotary kilns and sleeve kilns according to their structures and processes. The current beam-type gas-fired lime kiln uses a combustion beam to pass lime and air into the calcination zone of the lime kiln at a certain ratio for combustion, and heats the limestone to about 1150°C for calcination and decomposition to produce lime. The gas produced by our company's semi-coke plant is used as fuel for the lime kiln. According to the original design, the coal supply of the semi-coke plant and the gas consumption of the lime kiln are just in balance. However, the energy utilization rate of the existing lime kiln is low, the actual heat consumption is much higher than the design value, and the heat consumption per unit product is about 1300-1400kcal/kg lime, which exceeds 29% of the industrial design heat consumption of 1050kcal/kg lime, so it does not meet the energy requirements. The consumption "dual control" situation and policy, and then caused the lime kiln to fail to reach the designed capacity, and the actual capacity can only reach 75% of the designed capacity. Therefore, the lime production system has problems such as low production load, large gas consumption, and high manufacturing costs.

Contents of the invention

The embodiment of the present application provides an energy-saving lime production system and production method, which solves the problems in the prior art that the lime kiln cannot reach the designed production capacity and the gas consumption is large due to the low energy utilization rate of the lime kiln.

In order to achieve the above object, an embodiment of the present invention provides an energy-saving lime production system, including a lime kiln, a combustion-supporting fan, an air heat exchanger, a cooling fan, a hot water heat exchanger, and a gas heat exchanger;

The lime kiln is sequentially provided with an upper suction beam, an upper combustion beam, a lower combustion beam, and a closed ash discharger from top to bottom;

The air outlet of the combustion-supporting fan is divided into one way and connected to the cold source inlet of the air heat exchanger through the combustion-supporting air pipeline, and the cold source outlet of the air heat exchanger is divided into two ways respectively connected to the upper combustion beam The air inlet of the cooling air duct of the cooling air duct and the air inlet of the cooling air duct of the lower combustion beam;

The high-temperature exhaust gas outlet of the upper suction beam is connected to the heat exchange medium inlet of the air heat exchanger, and the heat exchange medium outlet of the air heat exchanger is connected to the first outlet of the hot water heat exchanger. Import of heat exchange medium;

The high-temperature exhaust gas outlet of the upper suction beam is branched into another path connected to the heat exchange medium inlet of the gas heat exchanger, and the heat exchange medium outlet of the gas heat exchanger is connected to the first outlet of the hot water heat exchanger. 2. Heat exchange medium inlet;

The gas outlet of the fuel system is connected to the cold source inlet of the gas heat exchanger, and the cold source outlet of the gas heat exchanger is respectively connected to the gas inlet of the upper combustion beam and the gas inlet of the lower combustion beam;

The air outlet of the cooling fan is connected to the cooling air inlet at the lower part of the lime kiln through the cooling air delivery pipe.

In a possible implementation, it also includes a material bell and a distributor;

The material bell and the material distributor are sequentially arranged above the feed inlet at the top of the lime kiln from top to bottom.

In a possible implementation mode, it also includes a kiln front feed bin, a volumetric bucket, a feeding trolley, a feeding track and a hoist;

The feeding trolley is slidably installed on the conveying track, the conveying track is obliquely installed on one side of the lime kiln, and a pulley is installed on the top of the conveying track;

The end of the traction rope on the hoist is connected to the upper end of the feeding trolley after bypassing the pulley;

The outlet of the feed bin in front of the kiln is arranged above the feed inlet of the volumetric hopper, the outlet of the volumetric bucket is arranged above the lower end of the conveying track, and the upper end of the conveying track is located at Above the feeding port of the material bell.

In a possible implementation, it also includes an intermediate storage bin, a belt conveyor, a screening machine, and a finished product bin;

The feed port of the intermediate storage bin is arranged below the discharge port of the closed ash discharger, and the discharge port of the intermediate storage bin is arranged above the feed end of the belt conveyor, so The discharge end of the belt conveyor is arranged above the feed port of the screening machine, and the discharge port of the screen machine is connected to the feed port of the finished product bin.

In a possible implementation, it also includes a dust collector, an induced draft fan, and a chimney;

The heat exchange medium outlet of the hot water heat exchanger is connected to the air inlet of the dust collector, the air outlet of the dust collector is connected to the air inlet of the induced draft fan, and the air outlet of the induced draft fan is connected to the Chimney air intake.

In a possible implementation manner, the cold source inlet of the hot water heat exchanger is connected to the water outlet of the coking circulating water pump, and the cold source outlet of the hot water heat exchanger is connected to the hot water tank in the living area.

In a possible implementation manner, the cooling air delivery pipe is connected to the combustion-supporting air pipeline through an emergency pipeline, and a damper is arranged on the emergency pipeline.

In a possible implementation manner, the air outlet of the cooling air duct of the upper combustion beam and the air outlet of the cooling air duct of the lower combustion beam are divided into two paths, one of which is connected to the combustion-supporting air outlet inside the lime kiln. The air ring pipe is connected to the combustion-supporting air emergency release pipe in the other way, and the air outlet of the combustion-supporting air emergency release pipe is connected with the outside world, and the combustion-supporting air emergency release pipe is provided with a release valve.

The embodiment of the present invention also provides an energy-saving lime production method, using the above-mentioned energy-saving lime production system, comprising the following steps:

Limestone is transported into the lime kiln through the feed port at the top of the lime kiln;

After the limestone enters the calcination zone, it is calcined and decomposed with the input coal gas and air. Calcium oxide is generated during calcination and decomposed, and high-temperature waste gas is released at the same time;

The high-temperature exhaust gas moves upwards, during which the high-temperature exhaust gas preheats the limestone moving to the calcination zone, and then the high-temperature exhaust gas is transported to the air heat exchanger through the high-temperature exhaust gas outlet of the upper suction beam and inside the gas heat exchanger;

The air heat exchanger heats the air output by the combustion-supporting fan and sends it to the cooling air duct of the upper combustion beam and the cooling air duct of the lower combustion beam, and the heated air exchanges heat again with the upper combustion beam and the lower combustion beam Participate in calcination and decomposition;

The gas heat exchanger heats the gas output from the fuel system and transports it to the gas inlet of the upper combustion beam and the gas inlet of the lower combustion beam, and the heated gas participates in calcination and decomposition;

The air output by the cooling fan enters from the lower part of the lime kiln, and after exchanging heat with the downwardly moving calcium oxide, the air continues to move upward and participate in calcination and decomposition; It is discharged through a closed ash discharge machine.

In a possible implementation manner, the high-temperature waste gas is sent to the hot water heat exchanger after heat exchange by the air heat exchanger and the gas heat exchanger, and the hot water heat exchanger turns the coking circulating water pump The output water is heated and sent to the hot water tank in the living area;

The hot water heat exchanger transports the high-temperature exhaust gas after heat exchange again to the dust collector for dust removal, and the exhaust gas treated by the dust collector is transported to the chimney for discharge under the action of the induced draft fan.

One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

The embodiment of the present invention provides an energy-saving lime production system and production method. The combustion-supporting fan of the system enters the air through the air inlet of the cooling air duct of the upper combustion beam and the air inlet of the cooling air duct of the lower combustion beam, and then The upper combustion beam and the lower combustion beam are cooled, and after the temperature rises, the air at about 200°C is produced and enters the combustion-supporting air channel of the upper combustion beam and the lower combustion beam, thereby participating in subsequent calcination and decomposition. The cooling fan passes the air into the cooling air pipe at the bottom of the kiln, and the cooling air pipe exchanges heat with the high-temperature lime to form high-temperature air, which rises to the combustion beam to participate in combustion. In this embodiment, the high-temperature waste gas from the kiln top is used to preheat the air and coal gas, and the high-temperature lime is used to preheat the air, so as to improve the energy utilization rate and the reaction efficiency. The coking circulating water pump transports the low-temperature water to the hot water heat exchanger for heat exchange, and the heated water is transported to the hot water tank in the living area for use in the living area, thereby realizing further utilization of heat energy. The invention reduces the gas consumption by reducing the heat energy loss in the production process, effectively increases the operating load of the lime kiln, realizes the gas balance of the semi-coke-lime kiln, effectively reduces energy waste, and improves the energy efficiency level of the system. The invention solves the problems in the prior art that the lime kiln cannot reach the designed production capacity and the gas consumption is large due to the low energy utilization rate of the lime kiln.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings that need to be used in the description of the embodiments. Apparently, the drawings in the following description are only some embodiments described in this application, and those skilled in the art can obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an energy-saving lime production system provided by an embodiment of the present invention.

Reference signs: 1-lime kiln; 2-upper suction beam; 3-upper combustion beam; 4-lower combustion beam; 5-combustion fan; 6-air heat exchanger; 7-cooling fan; 8-hot water exchange Heater; 9-gas heat exchanger; 10-closed ash machine; 11-combustion air pipeline; 12-cooling air delivery pipe; 13-material bell; 14-distributor; 16-Density bucket; 17-Loading trolley; 18-Conveying track; 19-Hoist; 20-Intermediate storage bin; 21-Belt conveyor; 22-Dust collector; 23-Induced fan; 24-Chimney; 25- Emergency pipeline; 26-damper.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer " and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, Constructed and operative in a particular orientation and therefore are not to be construed as limitations of the invention. The terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance. In addition, the terms "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it can be fixed connection, detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be It can be directly connected, or indirectly connected through an intermediary, and can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present invention according to specific situations.

As shown in Figure 1, the energy-saving lime production system provided by the embodiment of the present invention includes a lime kiln 1, a combustion-supporting fan 5, an air heat exchanger 6, a cooling fan 7, a hot water heat exchanger 8, and a gas heat exchanger 9 .

The lime kiln 1 is provided with an upper suction beam 2 , an upper combustion beam 3 , a lower combustion beam 4 , and a closed ash discharger 10 sequentially from top to bottom.

The air outlet of the combustion-supporting fan 5 is divided into one path and connected to the cold source inlet of the air heat exchanger 6 through the combustion-supporting air pipeline 11, and the cold source outlet of the air heat exchanger 6 is divided into two paths connected to the cooling air of the upper combustion beam 3 respectively. The air inlet of pipe and the air inlet of the cooling air duct of lower combustion beam 4.

The high-temperature exhaust gas outlet of the upper suction beam 2 is connected to the heat exchange medium inlet of the air heat exchanger 6, and the heat exchange medium outlet of the air heat exchanger 6 is connected to the first heat exchange medium inlet of the hot water heat exchanger 8 .

The high-temperature exhaust gas outlet of the upper suction beam 2 is divided into another path connected to the heat exchange medium inlet of the gas heat exchanger 9, and the heat exchange medium outlet of the gas heat exchanger 9 is connected to the second heat exchange medium of the hot water heat exchanger 8 import.

The gas outlet of the fuel system is connected to the cold source inlet of the gas heat exchanger 9, and the cold source outlet of the gas heat exchanger 9 is respectively connected to the gas inlet of the upper combustion beam 3 and the gas inlet of the lower combustion beam 4.

The air outlet of the cooling fan 7 is connected to the cooling air inlet of the lime kiln 1 bottom through the cooling air delivery pipe 12 .

It should be noted that in this embodiment, the original oil-cooled upper combustion beam 3 and lower combustion beam 4 are transformed into air-cooled upper combustion beam 3 and lower combustion beam 4, and the air passes through the cooling duct of the upper combustion beam 3 After entering the air inlet and the cooling air duct of the lower combustion beam 4, the upper combustion beam 3 and the lower combustion beam 4 are cooled first, and after the temperature rises, the air at about 200°C enters the combustion support of the upper combustion beam 3 and the lower combustion beam 4 Wind channel, thus participating in subsequent calcination and decomposition.

The cooling fan 7 passes the air into the cooling air pipes distributed in a rectangular grid at the bottom of the kiln. The cooling air pipes exchange heat with the high-temperature lime to form high-temperature air. The high-temperature air is output through the cooling air pipes, and then the high-temperature air rises to the combustion beam to participate in combustion. .

Combustion-supporting fan 5 and cooling fan 7 are both Roots fans. In this embodiment, high-temperature waste gas from the kiln top is used to preheat air and coal gas, and high-temperature lime is used to preheat air, thereby improving energy utilization and reaction efficiency.

In this embodiment, the original lower suction beam is removed, and the beam hole is blocked. Dismantle the original open-type ash-discharging equipment and replace it with a closed-type ash-discharging machine 10.

The production system also includes an intelligent combustion control system. The intelligent combustion control system collects environmental parameters such as the flow rate, temperature and pressure of the inner ring of the kiln, and automatically adjusts the production output operating parameters by controlling various fans, valves on the pipeline, pumps and other equipment. Realize the self-intelligent control of the lime production system, and only need to input the production output for the operation of the working condition, so that the operation of the lime kiln 1 is in the optimal state, and the heat consumption of the lime production is kept below 950kcal/kg. The specific control details of this part are the prior art, which will not be repeated in this embodiment.

The system modification investment of the invention is small, the construction period is short, and the energy saving level can be greatly improved.

In this embodiment, a material bell 13 and a distributor 14 are also included.

The material bell 13 and the distributor 14 are sequentially arranged above the feed inlet at the top of the lime kiln 1 from top to bottom.

It should be noted that the material bell 13 and the distributor 14 can evenly send a set amount of limestone into the feed inlet at the top of the lime kiln 1 .

In this embodiment, it also includes a kiln front feed bin 15 , a volume bucket 16 , a feeding trolley 17 , a feeding track 18 and a winch 19 .

Feeding trolley 17 is slidably installed on the material delivery track 18, and material delivery track 18 is obliquely installed on one side of lime kiln 1, and the top of material delivery track 18 is equipped with pulley.

The end of the traction rope on the winch 19 is connected to the upper end of the feeding trolley 17 after walking around the pulley.

The discharge port of the kiln front feed bin 15 is arranged above the feed port of the volumetric bucket 16, and the discharge port of the volumetric bucket 16 is arranged above the lower end of the delivery track 18, and the upper end of the delivery track 18 is located at the inlet of the material bell 13. above the feed port.

It should be noted that the limestone in the silo 15 in front of the kiln is transported to the volumetric bucket 16, and the volumetric bucket 16 puts the set amount of limestone into the feeding trolley 17, and starts the hoist 19, and the traction rope on the hoist 19 drives the loading trolley 17 goes up along the material delivery track 18, and the feeding trolley 17 moves to the upper end of the material delivery track 18 and automatically turns over and limestone is dropped into the material bell 13.

In this embodiment, an intermediate storage bin 20, a belt conveyor 21, a screening machine, and a finished product bin are also included.

The feed port of the intermediate storage bin 20 is arranged below the discharge port of the closed ash machine 10, the discharge port of the intermediate storage bin 20 is arranged above the feed end of the belt conveyor 21, and the belt conveyor 21 The discharge end is arranged above the feed port of the screening machine, and the discharge port of the screen machine is connected to the feed port of the finished product bin.

It should be noted that the calcium oxide output by the closed ash discharger 10 is first poured into the intermediate storage bin 20, and then the intermediate storage bin 20 transports the calcium oxide to the screening machine through the belt conveyor 21, and the screening machine performs screening. Finally, the calcium oxide is stored in the finished product warehouse.

In this embodiment, a dust collector 22, an induced draft fan 23, and a chimney 24 are also included.

The heat exchange medium outlet of the hot water heat exchanger 8 is connected to the air inlet of the dust collector 22 , the air outlet of the dust collector 22 is connected to the air inlet of the induced draft fan 23 , and the air outlet of the induced draft fan 23 is connected to the air inlet of the chimney 24 .

It should be noted that the waste gas output from the heat exchange medium outlet of the hot water heat exchanger 8 is dedusted by the dust collector 22 , and the treated waste gas is discharged through the chimney 24 under the action of the induced draft fan 23 .

In this embodiment, the cold source inlet of the hot water heat exchanger 8 is connected to the water outlet of the coking circulating water pump, and the cold source outlet of the hot water heat exchanger 8 is connected to the hot water tank in the living area.

It should be noted that the coking circulating water pump sends low-temperature water to the hot water heat exchanger 8 for heat exchange, and the heated water is sent to the hot water tank in the living area for use in the living area, thereby realizing further utilization of heat energy.

In this embodiment, the cooling air delivery pipe 12 is connected to the combustion-supporting air pipeline 11 through the emergency pipeline 25 , and the emergency pipeline 25 is provided with a damper 26 .

It should be noted that when the combustion-supporting fan 5 is shut down, the air valve 26 is opened, and the valve at the end of the cooling air delivery pipe 12 and the valve at the beginning of the combustion-supporting air pipeline 11 are closed, the cooling fan 7 delivers air to the air heat exchanger 6 , and then replace the combustion-supporting blower fan 5 as its standby machine, to ensure the normal supply of the cooling wind of the combustion beam.

In this embodiment, the air outlet of the cooling air duct of the upper combustion beam 3 and the air outlet of the cooling air duct of the lower combustion beam 4 are divided into two paths, one is connected to the combustion-supporting air ring pipe inside the lime kiln 1, and the other is connected to In the combustion-supporting air emergency release pipe, the air outlet of the combustion-supporting air emergency release pipe is connected with the outside world, and a release valve is arranged on the combustion-supporting air emergency release pipe.

It should be noted that the air outlet of the combustion-supporting air ring pipe is connected to the combustion-supporting air inlet of the upper combustion beam 3 and the combustion-supporting air inlet of the lower combustion beam 4, and the combustion-supporting air outlet of the upper combustion beam 3 and the combustion-supporting air outlet of the lower combustion beam 4 The wind discharged from the air outlet participates in the calcination and decomposition in the kiln.

When the temperature of the upper combustion beam 3 and the lower combustion beam 4 is too high, that is, when the cooling efficiency of the current combustion-supporting air is insufficient, increase the air supply volume of the combustion-supporting fan 5 and open the release valve, and the excess air will be discharged through the emergency release pipe of the combustion-supporting air to avoid The problem that the increase of air supply volume affects the smooth progress of calcination and decomposition is solved.

As shown in Figure 1, the embodiment of the present invention also provides an energy-saving lime production method, using the above-mentioned energy-saving lime production system, comprising the following steps:

The limestone is transported into the lime kiln 1 through the feed inlet at the top of the lime kiln 1 .

After the limestone enters the calcination zone, it will be calcined and decomposed with the input gas and air. Calcium oxide will be produced during the calcining and decomposed, and high-temperature waste gas will be released at the same time.

The high-temperature exhaust gas moves upward, during which the high-temperature exhaust gas preheats the limestone moving to the calcination zone, and then the high-temperature exhaust gas is transported to the air heat exchanger 6 and the gas heat exchanger 9 through the high-temperature exhaust gas outlet of the upper suction beam 2 .

The air heat exchanger 6 heats the air output by the combustion-supporting fan 5 and sends it to the cooling air duct of the upper combustion beam 3 and the cooling air duct of the lower combustion beam 4, and the heated air exchanges heat with the upper combustion beam 3 and the lower combustion beam 4 again After participating in calcination and decomposition.

The gas heat exchanger 9 heats the gas output from the fuel system and transports it to the gas inlet of the upper combustion beam 3 and the gas inlet of the lower combustion beam 4, and the heated gas participates in calcination and decomposition.

The air output by the cooling fan 7 enters from the lower part of the lime kiln 1, and after exchanging heat with the calcium oxide moving downward, the air continues to move upward and participates in calcination and decomposition. Calcium oxide is cooled to below 70°C after heat exchange and discharged through the closed ash discharger 10.

It should be noted that by setting the air heat exchanger 6 and the gas heat exchanger 9, the thermal energy in the high-temperature waste gas can be fully utilized, and the cooling of the calcium oxide and the further heating of the air can be realized through the cooling fan 7, thereby improving the efficiency of calcination and decomposition .

After the transformation of the company's 3 lime kilns 1, the output of the 3 lime kilns 1 has remained stable at more than 1,500t/d, and the annual lime production has increased by 130,000 tons compared with the original, saving about 33,600 tons of standard coal in energy consumption, which can reduce carbon dioxide emissions 90,000 tons, the effect of energy saving and carbon reduction is very prominent. The raw lime burning is stable below 10%, and the ash discharge temperature is below 70°C, which makes the product quality more stable. The heat consumption of the lime production process is reduced to 950kcal/kg, which is 100kcal/kg lower than the 1050kcal/kg production heat consumption of beam-type lime kiln 1 stipulated by the industry, creating the most advanced level of beam-type lime kiln 1 production heat consumption.

Three lime kilns 1 will increase production by 130,000 tons per year, and the fixed cost of lime plant production will be reduced by 13%. Calculated according to the price of raw coal, products, and electricity in 2022: the gross profit per ton of lime is 130 yuan, and the annual profit increase is 19.5 million yuan. 1,500 yuan per ton of standard coal, saving 50.4 million yuan in fuel costs annually. 0.55 yuan per kilowatt-hour, saving 2.36 million yuan in electricity bills annually. Save 600,000 yuan in heat transfer oil consumption and equipment maintenance costs every year. A total of 72.86 million yuan in cost reduction and profit creation, with remarkable economic benefits.

The method of the present invention has become a major breakthrough in the technology of beam-type lime kilns, promoted the development of the lime industry, can be fully promoted in the technological transformation of energy-saving and consumption-reducing technology of beam-type lime kilns that have been built in the country, and is widely used in new lime kilns. The economic benefits and energy-saving benefits are remarkable, and it has made a contribution to the lime industry for the "dual control" of national energy consumption. The present invention reduces gas consumption by reducing heat energy loss in the production process, effectively increases the operating load of the lime kiln 1, enables the semi-coke-lime kiln 1 to achieve gas balance, effectively reduces energy waste, and improves the energy efficiency level of the system.

In this embodiment, the high-temperature exhaust gas is sent to the hot water heat exchanger 8 after heat exchange by the air heat exchanger 6 and the gas heat exchanger 9, and the hot water heat exchanger 8 heats the water output by the coking circulating water pump and then sends it to the living room. District hot water tank.

The hot water heat exchanger 8 transports the high-temperature exhaust gas after heat exchange again to the dust collector 22 for dust removal, and the exhaust gas treated by the dust collector 22 is transported to the chimney 24 for discharge under the action of the induced draft fan 23 .

It should be noted that the high-temperature waste gas at about 280°C extracted from the kiln top, after heat exchange through the gas heat exchanger 9 and the air heat exchanger 6, the temperature drops below 170°C, and then after heat exchange through the hot water heat exchanger 8, The dust is filtered and removed by the bag filter 22, and the filtered waste gas is discharged up to the standard. The water in the hot water heat exchanger 8 is heated to above 60°C, and is used for heating and heating in the office and living areas of the whole plant, so as to save the cost of the public system, thereby further improving the utilization rate of heat energy.

In this embodiment, it is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention . Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention.

Claims (10)

1. An energy-saving type lime production system is characterized in that: comprise lime kiln (1), combustion-supporting fan (5), air heat exchanger (6), cooling fan (7), hot water heat exchanger (8), And gas heat exchanger (9); The lime kiln (1) is sequentially provided with an upper suction beam (2), an upper combustion beam (3), a lower combustion beam (4), and a closed ash discharger (10) from top to bottom; The air outlet of the combustion-supporting blower (5) separates one way through the combustion-supporting air pipeline (11) and is connected to the cold source inlet of the air heat exchanger (6), and the cold source outlet of the air heat exchanger (6) Branch out two roads and be respectively connected to the air inlet of the cooling air duct of the upper combustion beam (3) and the air inlet of the cooling air duct of the lower combustion beam (4); The high-temperature exhaust gas outlet of the upper suction beam (2) branches out one way and is connected to the heat exchange medium inlet of the air heat exchanger (6), and the heat exchange medium outlet of the air heat exchanger (6) is connected to the The first heat exchange medium inlet of the hot water heat exchanger (8); The high-temperature exhaust gas outlet of the upper suction beam (2) branches out to another path connected to the heat exchange medium inlet of the gas heat exchanger (9), and the heat exchange medium outlet of the gas heat exchanger (9) is connected to The second heat exchange medium inlet of the hot water heat exchanger (8); The gas outlet of the fuel system is connected to the cold source inlet of the gas heat exchanger (9), and the cold source outlet of the gas heat exchanger (9) is connected to the gas inlet of the upper combustion beam (3) and the gas inlet of the gas heat exchanger (9) respectively. Describe the gas inlet of the lower combustion beam (4); The air outlet of the cooling fan (7) is connected to the cooling air inlet at the lower part of the lime kiln (1) through the cooling air delivery pipe (12). 2. The energy-saving lime production system according to claim 1, characterized in that: it also includes a material bell (13) and a distributor (14); The material bell (13) and the material distributor (14) are sequentially arranged above the feed inlet at the top of the lime kiln (1) from top to bottom. 3. The energy-saving lime production system according to claim 2, characterized in that: it also includes a kiln front silo (15), a volume bucket (16), a feeding trolley (17), a feeding track (18) and a hoist (19); The feeding trolley (17) is slidably installed on the conveying track (18), and the conveying track (18) is obliquely installed on one side of the lime kiln (1), and the conveying track (18) ) is fitted with pulleys at the top; The end of the traction rope on the hoist (19) walks around the pulley and is connected to the upper end of the feeding trolley (17); The discharge opening of the kiln front feed bin (15) is arranged above the feed inlet of the volumetric bucket (16), and the discharge opening of the volumetric bucket (16) is arranged on the delivery track (18) Above the lower end, the upper end of the feeding track (18) is located above the feeding port of the material bell (13). 4. The energy-saving lime production system according to claim 1, characterized in that: it also includes an intermediate storage bin (20), a belt conveyor (21), a screening machine, and a finished product bin; The feed port of the intermediate storage bin (20) is arranged below the discharge port of the closed ash discharger (10), and the discharge port of the intermediate storage bin (20) is arranged on the belt Above the feeding end of the conveyor (21), the discharging end of the belt conveyor (21) is arranged above the feeding port of the screening machine, and the discharging port of the screening machine is connected to the finished product warehouse feed port. 5. The energy-saving lime production system according to claim 1, characterized in that: it also includes a dust collector (22), an induced draft fan (23), and a chimney (24); The heat exchange medium outlet of the hot water heat exchanger (8) is connected to the air inlet of the dust remover (22), and the air outlet of the dust remover (22) is connected to the air inlet of the induced draft fan (23) , the air outlet of the induced draft fan (23) is connected to the air inlet of the chimney (24). 6. The energy-saving lime production system according to claim 5, characterized in that: the cold source inlet of the hot water heat exchanger (8) is connected to the water outlet of the coking circulating water pump, and the hot water heat exchanger ( 8) The cold source outlet is connected to the hot water tank in the living area. 7. The energy-saving lime production system according to claim 1, characterized in that: the cooling air delivery pipe (12) is connected to the combustion-supporting air pipeline (11) through an emergency pipeline (25), and the emergency pipeline (25) is provided with damper (26). 8. The energy-saving lime production system according to claim 1, characterized in that: the air outlet of the cooling air duct of the upper combustion beam (3) and the air outlet of the cooling air duct of the lower combustion beam (4) Two paths are evenly divided, one is connected to the combustion-supporting air ring pipe inside the lime kiln (1), the other is connected to the combustion-supporting air emergency release pipe, the air outlet of the combustion-supporting air emergency release pipe is connected to the outside, and the combustion-supporting air A relief valve is provided on the wind emergency relief pipe. 9. An energy-saving lime production method, characterized in that, using the energy-saving lime production system according to any one of claims 1 to 8, comprising the following steps: Limestone is transported into the lime kiln (1) through the feed inlet at the top of the lime kiln (1); After the limestone enters the calcination zone, it is calcined and decomposed with the input coal gas and air. Calcium oxide is generated during calcination and decomposed, and high-temperature waste gas is released at the same time; The high-temperature exhaust gas moves upwards, during which the high-temperature exhaust gas preheats the limestone moving to the calcination zone, and then the high-temperature exhaust gas is transported to the air through the high-temperature exhaust gas outlet of the upper suction beam (2). Inside the heat exchanger (6) and the gas heat exchanger (9); The air heat exchanger (6) heats the air output by the combustion-supporting fan (5) and transports it to the cooling air duct of the upper combustion beam (3) and the cooling air duct of the lower combustion beam (4), and the heated air The upper combustion beam (3) and the lower combustion beam (4) participate in calcining and decomposition after exchanging heat again; The gas heat exchanger (9) heats the gas output from the fuel system and transports it to the gas inlet of the upper combustion beam (3) and the gas inlet of the lower combustion beam (4), and the heated gas participates in calcination and decomposition ; The air output by the cooling fan (7) enters from the lower part of the lime kiln (1), and after exchanging heat with the downwardly moving calcium oxide, the air continues to move upward and participates in calcination and decomposition; Cool to below 70°C and discharge through closed ash discharger (10). 10. The energy-saving lime production method according to claim 9, characterized in that: the high-temperature waste gas is transported to the heat exchanger after heat exchange by the air heat exchanger (6) and the gas heat exchanger (9). A water heat exchanger (8), the hot water heat exchanger (8) heats the water output by the coking circulating water pump and transports it to the hot water tank in the living area; The hot water heat exchanger (8) transports the high-temperature exhaust gas after heat exchange again to the dust collector (22) for dust removal, and the exhaust gas treated by the dust collector (22) is transported to the Chimney (24) discharges.

Images