CN108317864B - Cement kiln deep waste heat recovery cooperated garbage incineration system - Google Patents

Abstract

The invention discloses a cement kiln deep waste heat recovery cooperated waste incineration system, which belongs to the technical field of cement production waste heat recovery and waste incineration, and comprises a kiln head waste heat recovery system, a rotary kiln waste heat recovery system, a bypass air discharge system and a waste incineration system, wherein the kiln head waste heat recovery system comprises a grate cooler, a first dust removal device, a waste heat boiler, a second dust removal device, an induced air device and a connecting pipeline, the rotary kiln waste heat recovery system comprises an air supply device, an air heating device and a connecting pipeline, the bypass air discharge system comprises a third dust removal device and a connecting pipeline, and the waste incineration system comprises an incinerator, a primary air pipeline, a primary air preheater, a secondary air pipeline and a secondary air preheater. The invention effectively reduces the waste of energy sources in the waste incineration power generation and cement industry, effectively improves the overall power generation efficiency of the waste incineration power generation at one time, improves the cement production operation efficiency and reduces the operation energy consumption.

Description

A cement kiln deep waste heat recovery collaborative waste incineration system

Technical field

The invention belongs to the technical fields of cement production waste heat recovery and waste incineration technology, and specifically relates to a cement kiln deep waste heat recovery coordinated waste incineration system.

Background technique

In recent years, urban domestic waste disposal has increasingly become a social problem worldwide and is a very arduous comprehensive and systematic project. At present, many countries in the world, especially some advanced countries, use thermal treatment methods for the treatment of municipal solid waste. The thermal treatment method currently mainly uses incineration, which is also a garbage treatment method commonly used in countries around the world. It has the advantages of large processing capacity and reduction of waste. It has good capacitance and heat recovery characteristics.

There are more and more waste incineration power generation projects in our country, which has alleviated some problems of waste pollution. However, fly ash from waste-to-energy plants has high harmful components and is classified as hazardous waste. It must undergo strict technical treatment, usually through landfill. This landfilled fly ash still has the risk of polluting the environment and takes up part of the site. The slag discharged from waste incinerators in waste-to-energy power plants is generally disposed of by landfill. Since the waste slag contains harmful components such as heavy metals, this method still poses the risk of environmental pollution. For example, landfills from waste-to-energy power plants in Japan and other countries Ash and slag have caused environmental pollution accidents. Some landfills have dug out the ash and slag and sent them to cement rotary kilns for incineration.

Waste incineration power generation has the characteristics of large waste processing capacity and good capacity reduction. It can also convert the thermal energy of waste into electrical energy. The slag and fly ash produced by incineration are sent to the cement production system, so that the ash and slag materials are well processed. In addition, the cement production system is a large consumer of electricity. The electricity generated by waste incineration will be directly used in the cement production system, which not only reduces the waste of electrical energy in the transmission process and the investment in the construction of power transmission equipment caused by the outward transmission of waste-generated electricity, but also solves the problem of Cement plants consume a lot of electricity. Therefore, the joint construction of waste incineration power generation projects and cement projects is a feasible operation method.

However, the joint construction of waste incineration power generation projects and cement projects is still in the research and trial stage. There is energy waste in waste incineration power generation and the cement industry. The overall power generation efficiency of waste incineration power generation is low, and the cement production operation efficiency is low and the operation energy consumption is high. The problem.

Contents of the invention

The purpose of the present invention is to propose a cement kiln deep waste heat recovery collaborative waste incineration system to effectively reduce waste incineration power generation and energy waste in the cement industry, kill two birds with one stone, effectively improve the overall power generation efficiency of waste incineration power generation, and improve cement production operations. efficiency and reduce operating energy consumption.

The object of the present invention is achieved through the following technical solutions:

A cement kiln deep waste heat recovery collaborative waste incineration system, including a kiln head waste heat recovery system, a rotary kiln waste heat recovery system, a bypass ventilation system and a waste incineration system. The kiln head waste heat recovery system includes a grate cooler, a first dust removal device, a waste heat Boiler, second dust removal device, draft device and connecting pipes. The rotary kiln waste heat recovery system includes an air supply device, air heating device and connecting pipes. The bypass ventilation system includes a third dust removal device and connecting pipes. The waste incineration system includes an incinerator. , primary air duct and primary air air preheater, secondary air duct and secondary air air preheater. The primary air duct supplies hot primary air to the incinerator after passing through the primary air air preheater. The secondary air duct passes through the secondary air preheater. The secondary air preheater supplies hot secondary air to the incinerator;

In the waste heat recovery system at the kiln head, air extraction ports are provided in the middle and tail of the grate cooler. The hot air extracted from the middle air extraction port enters the waste heat boiler through the first dust removal device. After exchanging heat in the waste heat boiler, it passes through the second dust removal device for dust removal. The air induction device is led out and merged into the primary air duct after the primary air air preheater, or into the secondary air duct after the secondary air air preheater; the hot air extracted from the rear air extraction port enters the second dust collector device;

In the rotary kiln waste heat recovery system, the cold air is sent to the air heating device through the air supply device. After the rotary kiln surface absorbs the heat emitted by the rotary kiln, part of the hot air is sent to the bypass ventilation system before the third dust removal device. The cold air in the outlet duct of the road exhaust system is mixed with the bypass exhaust, and when the kiln head waste heat recovery system merges the hot air from the draft device into the primary air duct, the hot air heated by the air heating device is partially merged into the secondary air duct. In the secondary air duct after the secondary air preheater, or when the kiln head waste heat recovery system merges the hot air from the air induction device into the secondary air duct, the hot air heated by the air heating device is partially merged into the primary air duct. In the primary air duct after the air air preheater;

In the bypass ventilation system, part of the hot air introduced from the rotary kiln waste heat recovery system is mixed with the bypass ventilation. The mixed air after dust removal by the third dust removal device is sent to the waste incineration system and used as part of the combustion-supporting air in the waste incineration system.

In the present invention, in order to reduce waste incineration power generation and the energy waste existing in the cement industry, to kill two birds with one stone, improve the overall power generation efficiency of waste incineration power generation, improve cement production operation efficiency, and reduce operating energy consumption, the inventor has conducted in-depth research on waste incineration power generation. As well as the cement production process, the study found:

In waste incineration power generation projects, in order to enable better combustion of low calorific value waste, the primary and secondary air temperatures used for waste combustion should fully consider the characteristics of high moisture content, high ash content, and low calorific value of the waste. The combustion air must pass through After being heated by the steam air preheater, it can be sent to the incinerator. The combustion air entering the incinerator chamber should be maintained at a stable temperature. This temperature needs to be maintained by adjusting the flow of heating steam. Before the primary air enters the incinerator, it is heated to 200-220°C by a steam air preheater, and then the air is supplied from the lower part of the furnace in sections. Before the secondary air enters the incinerator, it is heated to 150-180°C by a steam air preheater, and then the secondary air is sprayed evenly from the front and rear arch groups of the incinerator to enhance the disturbance of the flue gas and extend the combustion stroke of the flue gas. , fully mixing the air and flue gas to ensure complete combustion of the combustible gas in the flue gas. However, this method of using higher-quality steam to heat the air will inevitably cause a waste of high-quality heat sources.

However, there is also a large amount of heat waste in the cement production system. In the cement clinker burning system, the blower blows the normal-temperature air from the grate cooler to cool the clinker. Part of the air heated by the high-temperature clinker is discharged as waste gas. , usually recycled and utilized through the construction of supporting waste heat power plants, and this part of the waste gas is introduced into the waste heat boiler of the waste heat power plant for heat exchange. The exhaust gas at the outlet of the waste heat boiler can be reduced to about 100°C. At the same time, low-temperature exhaust gas with a temperature of about 120°C is discharged from the exhaust port at the rear of the grate cooler. These two parts of low-temperature exhaust gas carry a large amount of heat and are discharged from the chimney, resulting in a large amount of waste of energy.

Due to the high internal temperature of the rotary kiln in the cement production system, although various thermal insulation measures are taken on the cylinder wall, its surface can still reach a certain temperature. To ensure the safe operation of the rotary kiln. Most of the kiln bodies are directly exposed to the air. In some special cases, fans are used to air-cool the surface of the kiln barrel to reduce the temperature of the kiln barrel surface. Although this layout can meet the needs of rotary kiln operation, it causes a large amount of heat energy to be directly lost to the air during the operation of the rotary kiln, resulting in a large amount of waste of energy.

In addition, in the cement production system, sometimes there is a situation where the content of chloride ions (Cl ^- ) brought into the raw fuel is high. When the volatilized chloride ions (Cl ^- ) reach the lower temperature area of the preheater, they will condense at high temperatures. In the lower raw meal, the condensed chloride ions (Cl ^- ) will return to the higher temperature kiln with the preheated raw meal and volatilize again, causing the chloride ions (Cl - ) to circulate and enrich within the kiln system. , it is easy to form crusts in the preheater system and even cause blockage, which seriously affects system production and product quality. Therefore, appropriate bypass ventilation measures are often taken in cement production to solve the problem of circulating harmful components and reduce harmful components in clinker. Practical solutions. However, the bypass exhaust exhausts very high-temperature exhaust gas, resulting in a large amount of waste of energy.

Therefore, the present invention proposes a cement kiln deep waste heat recovery collaborative waste incineration system, including a kiln head waste heat recovery system, a rotary kiln waste heat recovery system, a bypass ventilation system, and a waste incineration system. In the kiln head waste heat recovery system, the grate Air extraction ports are provided in the middle and tail of the cooling machine. The hot air with higher temperature extracted from the middle air extraction port enters the waste heat boiler after passing through the first dust removal device. After heat exchange in the waste heat boiler, it passes through the second dust removal device for dust removal and is led out through the air induction device. Since the air at the outlet of the draft device is still hot air with a certain temperature, this hot air is used as part of the primary and secondary air of the garbage incineration system.

In the rotary kiln waste heat recovery system, the cold air is sent to the air heating device through the air supply device, and the heat emitted by the rotary kiln is absorbed on the surface of the rotary kiln. The heated hot air is used as part of the primary and secondary air of the garbage incineration system. At the same time, because the temperature of the hot air in this part is relatively low, a small amount of hot air is used as cooling air for the bypass ventilation system.

In the bypass ventilation system, due to the high temperature of the bypass ventilation and the harmful substances are still in the gaseous state, the bypass ventilation needs to be cooled to 400-450°C to allow the harmful substances to condense, and a small amount of hot air is introduced from the rotary kiln waste heat recovery system to the bypass ventilation system. The road exhaust air is mixed, and when the temperature is lowered to a suitable temperature, the harmful substances are solidified in the dust and then introduced into the third dust removal device. The mixed gas after dust removal is sent to the garbage incineration system and used as part of the combustion-supporting air in the garbage incineration system.

As an option, in the kiln head waste heat recovery system, a valve is set on the middle exhaust pipe of the grate cooler and a valve is set on the rear exhaust pipe. When the waste heat boiler is operating normally, the valve on the middle exhaust pipe is open and the valve on the rear exhaust pipe is closed; When the waste heat boiler is decommissioned, the valve on the middle exhaust pipe is closed and the valve on the tail exhaust pipe is opened. In this plan, a valve is set on the middle exhaust pipe of the grate cooler, and a valve is set on the rear exhaust pipe. When the waste heat boiler is operating normally, the valve on the middle exhaust pipe is opened, and the valve on the rear exhaust pipe is closed, and hot air enters through the waste heat boiler. In the second dust removal device, when the waste heat boiler is decommissioned, the valve on the middle air extraction pipe is closed, the valve on the rear air extraction pipe is opened, and the hot air directly enters the second dust removal device.

As an option, the outlet pipe of the draft device is connected to the chimney through a valve and to the garbage incineration system through a valve. When the garbage incineration system is operating normally, close the valve connected to the chimney and open the valve connected to the garbage incineration system; when the garbage incineration system is decommissioned, When in operation, close the valve connected to the garbage incineration system and open the valve connected to the chimney. In this plan, the outlet pipe of the draft device is connected to the chimney through a valve and to the garbage incineration system through a valve. When the garbage incineration system is operating normally, the valve connected to the chimney is closed and the valve connected to the garbage incineration system is opened, and hot air enters the garbage incineration system. system, when the waste incineration system is decommissioned, the valve connected to the waste incineration system is closed, the valve connected to the chimney is opened, and the hot air is discharged into the atmosphere.

As an option, a valve is installed on the pipe connecting the rotary kiln waste heat recovery system and the waste incineration system. When the waste incineration system is operating normally, the valve is opened and when the waste incineration system is decommissioned, the valve is closed; A valve is installed on the pipeline. When the bypass ventilation system is operating normally, the valve is opened and when the bypass ventilation system is decommissioned, the valve is closed.

As a further option, valves are provided on the outlet pipe of the bypass ventilation system and on the pipeline connecting the third dust removal device to the garbage incineration system. When the bypass ventilation system is put into operation, the valves on the outlet pipe of the bypass ventilation system and the garbage incineration system are opened at the same time. The valves connected to the incineration system and the valves connected to the rotary kiln waste heat recovery system will be closed when the bypass ventilation system is decommissioned.

As an option, a regulating valve is installed at the outlet of the primary air air preheater.

As an option, a regulating valve is installed at the outlet of the secondary air air preheater.

In the above scheme, in the garbage incineration system, the primary air usually extracts air from the garbage storage pit to maintain the pressure in the garbage storage pit at a negative pressure to prevent the odor from escaping, and the secondary air extracts the odor from the sealing cover of the incinerator feeder. Air to maintain the air environment in the incineration room. Since the primary and secondary air temperatures required for waste incineration are low, and the hot air sent from the kiln head waste heat recovery system and the rotary kiln waste heat recovery system already has a certain temperature and flow rate, only a primary fan is needed to move a small amount of air It is sent to the primary air steam air preheater, and the secondary air fan sends a small amount of air to the secondary air steam air preheater. After being heated by the external heating steam, it is mixed with the hot air from the cement production system and sent to the incinerator. . In addition, the mixed air with higher temperature in the bypass ventilation system directly enters the waste incinerator and is used as part of the combustion-supporting air in the waste incineration system. Set a regulating valve at the outlet of the primary air steam air preheater to control the temperature and flow rate of the primary air, so that after the primary air is mixed with the hot air from the cement system, the temperature and flow rate of the mixed hot air can meet the requirements of the incinerator. A regulating valve is installed at the outlet of the secondary air steam air preheater to control the temperature and flow rate of the secondary air, so that after the secondary air is mixed with the hot air from the cement system, the temperature and flow rate of the mixed hot air can meet the requirements of the incinerator.

The aforementioned main scheme of the present invention and its further options can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection by the present invention; and in the present invention, (non-conflicting options) between choices and between other choices Rooms can also be freely combined. After understanding the solution of the present invention, those skilled in the art will understand that there are many combinations according to the existing technology and common knowledge, all of which are the technical solutions to be protected by the present invention, and an exhaustive list will not be made here.

Beneficial effects of the present invention: The present invention provides a cement kiln deep waste heat recovery collaborative waste incineration system, which organically combines waste incineration and cement kiln waste heat recovery, effectively reduces waste incineration power generation and energy waste in the cement industry, and is effective in killing two birds with one stone. Improving the overall power generation efficiency of waste incineration power generation while improving cement production and operation efficiency and reducing operating energy consumption has good economic and environmental benefits:

1. Achieve deep recovery of cement kiln waste heat, make full use of the relatively low-temperature hot air at the kiln head and the heat loss on the surface of the rotary kiln barrel, and recover and utilize the low-temperature waste heat of the cement kiln to partially replace the waste incineration. The secondary air reduces the amount of steam used to heat the air, replacing the high-quality heat source with a low-quality heat source. The high-quality steam is used for power generation, improving the overall power generation efficiency of waste incineration power generation, improving cement production operation efficiency, and reducing Operating energy consumption.

2. When the chloride ion content of the raw fuel brought into the cement production system is unstable and the bypass ventilation system is frequently opened and stopped from time to time, you only need to open or close the connected system valve; at the same time, the bypass When the ventilation system is turned on, a small amount of hot air is introduced from the rotary kiln waste heat recovery system and mixed with the bypass ventilation. When the temperature is lowered to a suitable temperature, harmful substances are solidified in the dust and then introduced into the high-temperature dust collector. The mixed air after dust removal is sent to the garbage incineration system. , used as part of the combustion-supporting air in the waste incineration system, it can not only meet the requirements of the cement production system without affecting the normal operation of the waste incineration system, but also can recover and utilize this part of the heat.

3. Realize the complementarity between waste incineration power generation and cement production, and send the slag and fly ash generated by waste incineration into the cement production system so that the ash and slag materials can be well processed. Waste incineration power generation has the characteristics of large waste processing capacity and good capacity reduction. It can also convert the thermal energy of waste into electrical energy. The electricity generated by waste incineration will be directly used in the cement production system, which not only reduces the waste caused by the external transmission of waste electricity The waste of electric energy during the power transmission process and the investment and construction of power transmission equipment also solve the need for cement kilns to consume large amounts of electricity.

Description of the drawings

Figure 1 is a schematic flow diagram of the device according to Embodiment 1 of the present invention;

Figure 2 is a schematic flow diagram of the device according to Embodiment 2 of the present invention;

Among them, 1----Grate cooler, 2----Dust collector, 3----AQC boiler, 4----Dust collector, 5----Induced draft fan, 6----Chimney, 7----Air blower, 8----Air heating device, 9----High temperature dust collector, 10----Incinerator, 11----Primary fan, 12----Primary air steam Type air preheater, 13----Secondary air fan, 14----Secondary air steam air preheater, 15----Rotary kiln, 16----Decomposition furnace, 17--- -Fume purification and treatment system, 18----valve.

Detailed ways

The following non-limiting examples illustrate the invention.

Example 1:

As shown in Figure 1, the cement kiln deep waste heat recovery collaborative waste incineration system consists of a kiln head waste heat recovery system, a rotary kiln waste heat recovery system, a bypass ventilation system, and a waste incineration system. The kiln head waste heat recovery system includes a grate cooler 1, a collector Dust collector 2 (first dust removal device), AQC boiler 3 (waste heat boiler), dust collector 4 (second dust removal device), draft fan 5 (draft induction device), chimney 6 and connecting pipes, the rotary kiln waste heat recovery system includes an air blower 7 (air supply device), air heating device 8 and connecting pipes, the bypass ventilation system includes a high-temperature dust collector 9 and connecting pipes, the garbage incineration system includes an incinerator 10, a primary fan 11, and a primary air steam air preheater 12 , secondary air fan 13, secondary air steam air preheater 14 and connecting pipes.

In the kiln head waste heat recovery system, air extraction ports are provided in the middle and tail of the grate cooler 1. The hot air with higher temperature extracted from the middle air extraction port enters the AQC boiler 3 through the dust collector 2. After heat exchange in the AQC boiler 3, The dust collector 4 removes dust, and the hot air extracted from the tail exhaust port also enters the dust collector 4 for dust removal, and is then led out through the induced draft fan 5. Since the air at the outlet of the induced draft fan 5 is still hot air with a certain temperature, this hot air is burned as garbage. Part of the system is used for primary wind.

Set valve 18 on the middle exhaust pipe of grate cooler 1, and set valve 18 on the rear exhaust pipe. When AQC boiler 3 is operating normally, valve 18 on the middle exhaust pipe opens, and valve 18 on the rear exhaust pipe closes, and the hot air passes through the AQC Boiler 3 enters dust collector 4. When AQC boiler 4 is decommissioned, the valve 18 on the middle exhaust pipe is closed and the valve 18 on the rear exhaust pipe is opened. The hot air directly enters dust collector 4. The outlet pipe of induced draft fan 5 is connected to the chimney through valve 18. 6 is connected to the waste incineration system through valve 18. When the waste incineration system is operating normally, the valve 18 connected to the chimney 6 is closed, the valve 18 connected to the waste incineration system is opened, and hot air enters the waste incineration system. When the incinerator 10 is decommissioned , close the valve 18 connected to the garbage incineration system, open the valve 18 connected to the chimney 6, and discharge the hot air into the atmosphere.

In the rotary kiln waste heat recovery system, the cold air is sent to the air heating device 8 through the air blower 7, and the heat emitted by the rotary kiln is absorbed on the surface of the rotary kiln. The heated hot air is used as part of the secondary air of the garbage incineration system. At the same time, because the temperature of the hot air in this part is relatively low, a small amount of hot air is used as cooling air for the bypass ventilation system. Valve 18 is set on the pipeline connected to the waste incineration system. When the waste incineration system is operating normally, valve 18 is opened. When the waste incineration system is decommissioned, valve 18 is closed. Valve 18 is set on the pipeline connected to the bypass ventilation system. , when the bypass ventilation system is operating normally, the valve 18 is opened, and when the bypass ventilation system is decommissioned, the valve 18 is closed.

In the bypass ventilation system, due to the high temperature of the bypass ventilation and the harmful substances are still in the gaseous state, the bypass ventilation needs to be cooled to 400-450°C to allow the harmful substances to condense, and a small amount of hot air is introduced from the rotary kiln waste heat recovery system to the bypass ventilation system. The air is released from the road for mixing, and when the temperature is lowered to a suitable temperature, the harmful substances are solidified in the dust and then introduced into the high-temperature dust collector 9 (the third dust removal device). The mixed gas after dust removal is sent to the garbage incineration system and used as part of the combustion-supporting air of the garbage incineration system. Valve 18 is provided on the outlet pipe of the bypass ventilation system and on the pipe connecting the high-temperature dust collector 9 and the garbage incineration system. When the bypass ventilation system is put into operation, the valve 18 on the outlet pipe of the bypass ventilation system is opened at the same time to connect with the garbage incineration system. The valve 18 connected to the system and the valve 18 connected to the rotary kiln waste heat recovery system will be closed when the bypass ventilation system is decommissioned.

In the garbage incineration system, the primary air usually extracts air from the garbage storage pit to maintain the pressure in the garbage storage pit at a negative pressure to prevent the odor from escaping. The secondary air extracts the odor from the sealing cover of the incinerator feeder to maintain incineration. room air environment. Since the primary air and secondary air required for garbage incineration have low temperatures, and the hot air sent from the kiln head waste heat recovery system and the rotary kiln waste heat recovery system already has a certain temperature and flow rate, only the primary fan 11 needs to blow a small amount of air. The air is sent to the primary air steam air preheater 12, and the secondary air fan 13 sends a small amount of air to the secondary air steam air preheater 14. It is heated by the external heating steam and mixed with the hot air from the cement production system. Send to incinerator 10. In addition, the mixed gas with a higher temperature in the bypass ventilation system directly enters the waste incinerator 10 and is used as part of the combustion-supporting air in the waste incineration system. A regulating valve 18 is provided at the outlet of the primary air steam air preheater 12 to control the temperature and flow rate of the primary air, so that after the primary air is mixed with the hot air from the cement system, the temperature and flow rate of the mixed hot air can meet the requirements of the incinerator 10 It is required that a regulating valve 18 be installed at the outlet of the secondary air steam air preheater 13 to control the temperature and flow of the secondary air, so that after the secondary air is mixed with the hot air from the cement system, the temperature and flow of the mixed hot air can meet Incinerator 10 requirements.

Example 2:

As shown in Figure 2, the cement kiln deep waste heat recovery collaborative waste incineration system consists of a kiln head waste heat recovery system, a rotary kiln waste heat recovery system, a bypass ventilation system, and a waste incineration system. The kiln head waste heat recovery system includes a grate cooler 1, a collection Dust collector 2 (first dust removal device), AQC boiler 3 (waste heat boiler), dust collector 4 (second dust removal device), draft fan 5 (draft induction device), chimney 6 and connecting pipes, the rotary kiln waste heat recovery system includes an air blower 7 (air supply device), air heating device 8 and connecting pipes, the bypass ventilation system includes a high-temperature dust collector 9 and connecting pipes, the garbage incineration system includes an incinerator 10, a primary fan 11, and a primary air steam air preheater 12 , secondary air fan 13, secondary air steam air preheater 14 and connecting pipes.

In the kiln head waste heat recovery system, air extraction ports are provided in the middle and tail of the grate cooler 1. The hot air with higher temperature extracted from the middle air extraction port enters the AQC boiler 3 through the dust collector 2. After heat exchange in the AQC boiler 3, The dust collector 4 removes dust, and the hot air extracted from the tail exhaust port also enters the dust collector 4 for dust removal, and is then led out through the induced draft fan 5. Since the air at the outlet of the induced draft fan 5 is still hot air with a certain temperature, this hot air is burned as garbage. Part of the system is used for secondary air.

Set valve 18 on the middle exhaust pipe of grate cooler 1, and set valve 18 on the rear exhaust pipe. When AQC boiler 3 is operating normally, valve 18 on the middle exhaust pipe opens, and valve 18 on the rear exhaust pipe closes, and the hot air passes through the AQC Boiler 3 enters dust collector 4. When AQC boiler 4 is decommissioned, the valve 18 on the middle exhaust pipe is closed and the valve 18 on the rear exhaust pipe is opened. The hot air directly enters dust collector 4. The outlet pipe of induced draft fan 5 is connected to the chimney through valve 18. 6 is connected to the waste incineration system through valve 18. When the waste incineration system is operating normally, the valve 18 connected to the chimney 6 is closed, and the valve 18 connected to the waste incineration system is opened. Hot air enters the waste incineration system. When the incinerator 10 is decommissioned, , close the valve 18 connected to the garbage incineration system, open the valve 18 connected to the chimney 6, and discharge the hot air into the atmosphere.

In the rotary kiln waste heat recovery system, the cold air is sent to the air heating device 8 through the air blower 7, and the heat emitted by the rotary kiln is absorbed on the surface of the rotary kiln. The heated hot air is used as part of the primary air of the garbage incineration system. Since the temperature of the hot air in this part is relatively low, a small amount of hot air is used as cooling air for the bypass ventilation system. Valve 18 is set on the pipeline connected to the waste incineration system. When the waste incineration system is operating normally, valve 18 is opened. When the waste incineration system is decommissioned, valve 18 is closed. Valve 18 is set on the pipeline connected to the bypass ventilation system. , when the bypass ventilation system is operating normally, the valve 18 is opened, and when the bypass ventilation system is decommissioned, the valve 18 is closed.

In the bypass ventilation system, due to the high temperature of the bypass ventilation and the harmful substances are still in the gaseous state, the bypass ventilation needs to be cooled to 400-450°C to allow the harmful substances to condense, and a small amount of hot air is introduced from the rotary kiln waste heat recovery system to the bypass ventilation system. The air is released from the road for mixing, and when the temperature is lowered to a suitable temperature, the harmful substances are solidified in the dust and then introduced into the high-temperature dust collector 9 (the third dust removal device). The mixed gas after dust removal is sent to the garbage incineration system and used as part of the combustion-supporting air of the garbage incineration system. Valve 18 is provided on the outlet pipe of the bypass ventilation system and on the pipe connecting the high-temperature dust collector 9 and the garbage incineration system. When the bypass ventilation system is put into operation, the valve 18 on the outlet pipe of the bypass ventilation system is opened at the same time to connect with the garbage incineration system. The valve 18 connected to the system and the valve 18 connected to the rotary kiln waste heat recovery system will be closed when the bypass ventilation system is decommissioned.

In the garbage incineration system, the primary air usually extracts air from the garbage storage pit to maintain the pressure in the garbage storage pit at a negative pressure to prevent the odor from escaping. The secondary air extracts the odor from the sealing cover of the incinerator feeder to maintain incineration. room air environment. Since the primary air and secondary air required for garbage incineration have low temperatures, and the hot air sent from the kiln head waste heat recovery system and the rotary kiln waste heat recovery system already has a certain temperature and flow rate, only the primary fan 11 needs to blow a small amount of air. The air is sent to the primary air steam air preheater 12, and the secondary air fan 13 sends a small amount of air to the secondary air steam air preheater 14. It is heated by the external heating steam and mixed with the hot air from the cement production system. Send to incinerator 10. In addition, the mixed gas with a higher temperature in the bypass ventilation system directly enters the waste incinerator 10 and is used as part of the combustion-supporting air in the waste incineration system. A regulating valve 18 is provided at the outlet of the primary air steam air preheater 12 to control the temperature and flow rate of the primary air, so that after the primary air is mixed with the hot air from the cement system, the temperature and flow rate of the mixed hot air can meet the requirements of the incinerator 10 It is required that a regulating valve 18 be installed at the outlet of the secondary air steam air preheater 13 to control the temperature and flow of the secondary air, so that after the secondary air is mixed with the hot air from the cement system, the temperature and flow of the mixed hot air can meet Incinerator 10 requirements.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (9)

1. The utility model provides a cement kiln degree of depth waste heat recovery cooperatees msw incineration system which characterized in that: the waste heat recovery system of the rotary kiln comprises an air supply device, an air heating device and a connecting pipeline, the bypass air release system comprises a third dust removal device and the connecting pipeline, the waste incineration system comprises an incinerator, a primary air pipeline, a primary air preheater, a secondary air pipeline and a secondary air preheater, the primary air pipeline supplies hot primary air for the incinerator after passing through the primary air preheater, and the secondary air pipeline supplies hot secondary air for the incinerator after passing through the secondary air preheater;

in the kiln head waste heat recovery system, the middle part and the tail part of the grate cooler are provided with extraction openings, hot air extracted from the extraction openings in the middle part enters a waste heat boiler through a first dust removal device, is subjected to dust removal through a second dust removal device after the waste heat boiler exchanges heat, and is introduced through an air introduction device and then is merged into a primary air pipeline behind a primary air preheater or is merged into a secondary air pipeline behind a secondary air preheater; hot air extracted from the tail extraction opening enters a second dust removing device;

in the waste heat recovery system of the rotary kiln, cold air is sent into an air heating device through an air supply device, after the surface of the rotary kiln absorbs heat emitted by the rotary kiln, part of hot air is sent into a bypass air discharge system leading-out pipeline in front of a third dust removal device of a bypass air discharge system to be mixed with bypass air discharge, and when the kiln head waste heat recovery system merges the hot air led out by the air guide device into a primary air pipeline, the hot air heated by the air heating device is partially merged into a secondary air pipeline behind a secondary air preheater, or when the kiln head waste heat recovery system merges the hot air led out by the air guide device into a secondary air pipeline, the hot air heated by the air heating device is partially merged into the primary air pipeline behind the primary air preheater;

in the bypass air release system, part of hot air introduced from the rotary kiln waste heat recovery system is mixed with bypass air release, and the mixed gas after dust removal by the third dust removal device is sent to the garbage incineration system and used as part of combustion air of the garbage incineration system.

2. The cement kiln deep waste heat recovery cooperative waste incineration system according to claim 1, wherein: in the kiln head waste heat recovery system, a valve is arranged on an air extraction pipeline in the middle part of the grate cooler, a valve is arranged on an air extraction pipeline at the tail part, when the waste heat boiler normally operates, the valve on the air extraction pipeline at the middle part is opened, and the valve on the air extraction pipeline at the tail part is closed; when the waste heat boiler is separated, the valve on the middle air extraction pipeline is closed, and the valve on the tail air extraction pipeline is opened.

3. The cement kiln deep waste heat recovery cooperative waste incineration system according to claim 1, wherein: the outlet pipeline of the induced draft device is connected with the chimney through a valve and the garbage incineration system through a valve respectively, when the garbage incineration system normally operates, the valve connected with the chimney is closed, and the valve connected with the garbage incineration system is opened; when the garbage incineration system is separated, the valve connected with the garbage incineration system is closed, and the valve connected with the chimney is opened.

4. The cement kiln deep waste heat recovery cooperative waste incineration system according to claim 1, wherein: a valve is arranged on a pipeline connected with the waste heat recovery system and the waste incineration system of the rotary kiln, the valve is opened when the waste incineration system normally operates, and the valve is closed when the waste incineration system is separated; and a valve is arranged on a pipeline connected with the bypass air release system, and is opened when the bypass air release system operates normally and closed when the bypass air release system is disconnected.

5. The cement kiln deep waste heat recovery cooperative waste incineration system according to claim 4, wherein: and when the bypass air release system is put in, the valve on the bypass air release system lead-out pipeline, the valve connected with the garbage incineration system and the valve connected with the rotary kiln waste heat recovery system are simultaneously opened, and when the bypass air release system is disconnected, the connected valve is closed.

6. The cement kiln deep waste heat recovery cooperative waste incineration system according to claim 1, wherein: an adjusting valve is arranged at the outlet of the primary air preheater.

7. The cement kiln deep waste heat recovery cooperative waste incineration system according to claim 1, wherein: and an adjusting valve is arranged at the outlet of the secondary air preheater.

8. The cement kiln deep waste heat recovery cooperative waste incineration system according to claim 1, wherein: the primary air preheater is a primary air steam type air preheater, and the secondary air preheater is a secondary air steam type air preheater.

9. The cement kiln deep waste heat recovery cooperative waste incineration system according to claim 1, wherein: the incinerator in the garbage incineration system is a grate type incinerator or a fluidized bed type incinerator.