Resource utilization system for sludge coupling construction site wooden formwork and working method

Abstract

According to the resource utilization system for the sludge coupling construction site wooden formwork and the working method, collaborative resource utilization of two different materials can be achieved, and the requirement for ultra-clean emission of smoke can be met. The first-stage high-pressure vertical dewatering equipment, the second-stage steam drying equipment and the dry sludge temporary storage warehouse are connected in sequence, and the dry sludge temporary storage warehouse is connected with the incinerator; the first-stage crushing and iron removing system, the second-stage crushing and iron removing system and the third-stage crushing system are sequentially connected, and the third-stage crushing system is connected with the incinerator; the incinerator is connected with the steam turbine generator unit and the dry desulfurization system, and the steam turbine generator unit is connected with the secondary steam drying equipment; the dry desulfurization system, the SNCR denitration system, the metal filter cartridge dust remover, the SCR denitration system, the dry deacidification system, the activated carbon injection system and the bag-type dust remover are connected in sequence; and the multi-medium heat exchange device is connected with the bag-type dust collector, the wet deacidification system, the incinerator, the metal filter cartridge dust collector and the secondary steam drying equipment.

Description

Technical Field

[0001] The invention relates to a resource utilization system and a working method of a sludge-coupled construction site wooden formwork. Background Art

[0002] Municipal sludge treatment and disposal is an important part of urban solid waste disposal. In the national plan, it is clearly required that the harmless disposal rate of urban sludge should reach more than 90%. Among the many sludge disposal routes, sludge incineration technology has the characteristics of harmlessness, reduction, and resource utilization, and has become a disposal route encouraged by the state. From 2019 to 2021, the treatment process based on incineration accounted for more than 65% of the newly built sludge disposal projects. However, municipal sludge has the characteristics of low calorific value and calorific value fluctuations with the seasons, which brings great difficulties to the self-sustaining incineration of sludge. Therefore, it is generally necessary to add auxiliary fuel to the sludge incinerator to ensure the normal incineration of sludge.

[0003] Wooden formworks at construction sites have always been an important part of urban solid waste. The untreated wooden formworks are piled up randomly, which not only affects the appearance of the city, but also becomes a "misplaced resource" that fails to be fully utilized. However, due to the low calorific value, high ash content and high moisture content of sludge, and the large amount of impurities in wooden formworks at construction sites, the formwork binder contains more corrosive substances. Therefore, compared with the conventional independent incineration of sludge, if sludge and wooden formworks at construction sites are to be incinerated in coordination, not only do they have different disposal requirements in the fuel drying pretreatment section, but they are also different from independent incineration projects in the incineration section and flue gas purification section. Therefore, there is an urgent need for a resource utilization technology that coordinates sludge and wooden formworks at construction sites. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a sludge-coupled construction site wooden formwork resource utilization system and working method with a reasonable structural design, coupled with drying, incineration and flue gas purification processes, which can achieve the coordinated resource utilization of two different materials and the flue gas meets ultra-clean emission requirements.

[0005] The technical solution adopted by the present invention to solve the above-mentioned problems is: a resource utilization system of sludge coupled with wooden formwork at construction sites, which is characterized by: comprising a first-level high-pressure vertical dehydration device, a second-level steam drying device, a dry sludge temporary storage warehouse, a first-level crushing and iron removal system, a second-level crushing and iron removal system, a third-level crushing system, an incinerator, a steam turbine generator set, a dry desulfurization system, an SNCR denitrification system, a metal filter cartridge dust collector, an SCR denitrification system, a dry deacidification system, an activated carbon injection system, a bag dust collector, a multi-media heat exchange device and a wet deacidification system; ... The vertical pressure dehydration equipment, the secondary steam drying equipment, and the dry sludge temporary storage are connected in sequence, and the dry sludge temporary storage is connected to the sludge feeding port of the incinerator; the primary crushing and iron removal system, the secondary crushing and iron removal system, and the tertiary crushing system are connected in sequence, and the tertiary crushing system is connected to the wood feeding port of the incinerator; the steam outlet of the incinerator is connected to the steam inlet of the steam turbine generator set, and the steam extraction port of the steam turbine generator set is connected to the steam inlet of the secondary steam drying equipment; the flue gas outlet of the incinerator is connected to the dry desulfurization system, the dry desulfurization system, the SNCR denitrification system, and the metal filter cartridge The dust collector, SCR denitrification system, dry deacidification system, activated carbon injection system, and bag dust collector are connected in sequence; the multi-media heat exchange device includes a main heat exchanger, a bypass heat exchanger, a switching valve 1 and a switching valve 2; the main heat exchanger is provided with a flue gas flow channel, a combustion air flow channel, a compressed air flow channel and a drain flow channel, wherein the flue gas flow channel is a hot fluid flow channel, and the combustion air flow channel, the compressed air flow channel and the drain flow channel are all cold fluid flow channels; the inlet of the flue gas flow channel is connected to the bag dust collector, and the outlet is connected to the flue gas inlet of the wet deacidification system; the combustion air flow channel is The outlet is connected to the air inlet of the incinerator; the outlet of the compressed air flow channel is divided into two paths, one path is connected to the hot flow channel inlet of the bypass heat exchanger through switching valve 2, and the other path is connected to the compressed air inlet of the metal filter cartridge dust collector through switching valve 1; the inlet of the drain flow channel is connected to the drain outlet of the secondary steam drying equipment, the outlet is connected to the inlet of the cold fluid flow channel of the bypass heat exchanger, the outlet of the cold fluid flow channel of the bypass heat exchanger is connected to the desalted water inlet of the steam turbine generator set, and the hot flow channel outlet of the bypass heat exchanger is connected to the compressed air inlet of the metal filter cartridge dust collector.

[0006] The present invention also comprises a wet sludge temporary storage receiving bin, and a sludge outlet of the wet sludge temporary storage receiving bin is connected with a sludge inlet of a primary high-pressure vertical dewatering device.

[0007] The sludge outlet of the dry sludge temporary storage bin of the present invention is connected to the sludge feeding port of the incinerator through the dry sludge scraper conveying equipment.

[0008] The present invention also comprises a chimney, and the smoke outlet of the wet deacidification system is connected to the chimney.

[0009] The main heat exchanger described in the present invention is a shell and tube heat exchanger.

[0010] The secondary steam drying equipment described in the present invention adopts a disc dryer, a paddle dryer or a thin layer dryer.

[0011] The incinerator of the present invention adopts a circulating fluidized bed furnace type with a cyclone separator.

[0012] The working method of the sludge coupled construction site wooden formwork resource utilization system is characterized by comprising the following processes: 1. Wet sludge pretreatment, including the following steps: (1) The wet sludge is sent to the first-stage high-pressure vertical dewatering equipment for first-stage filter pressing; (2) The sludge after the first-stage filter press enters the second-stage steam drying equipment for secondary drying; (3) The dry sludge after secondary drying needs to be sent to the dry sludge temporary storage warehouse for temporary storage; 2. Pretreatment of wooden formwork mud at construction sites includes the following steps: The wooden formwork at the construction site first enters the primary crushing and iron removal system for primary crushing and iron removal, then enters the secondary crushing and iron removal system for secondary crushing and iron removal, and then enters the tertiary crushing system for tertiary crushing; 3. After pretreatment, the sludge is transported to the incinerator and incinerated together with the pretreated wooden formwork materials of the construction site; 4. The incinerator burns to produce high-quality steam, which drives the steam turbine generator set to generate electricity; the steam extracted from the steam turbine generator set enters the secondary steam drying equipment for secondary drying of sludge; 5. The flue gas from the incinerator is sequentially desulfurized by the dry desulfurization system, denitrated by the SNCR denitrification system, dedusted by the metal cartridge dust collector, denitrated by the SCR denitrification system, deacidified by the dry deacidification system, de-heavy metal removed by the activated carbon injection system, and dedusted by the bag filter dust collector. It then enters the flue gas flow channel of the main heat exchanger for cooling and is then sent to the wet deacidification system for the final wet deacidification treatment. In the multi-media heat exchange device, combustion air is fed into the inlet of the combustion air flow channel, the combustion air is heated up after heat exchange, and then enters the incinerator; the drain of the secondary steam drying equipment enters the drain flow channel, the drain is heated up after heat exchange, and then enters the cold fluid flow channel of the bypass heat exchanger, and then enters the steam turbine generator set; under normal operating conditions, close the switching valve 2, open the switching valve 1, and feed the compressed air into the inlet of the compressed air flow channel, the compressed air enters the metal filter cartridge dust collector after heat exchange and temperature increase in the main heat exchanger; under startup conditions, open the switching valve 2, close the switching valve 1, and feed the compressed air into the inlet of the compressed air flow channel, the compressed air enters the bypass heat exchanger after heat exchange with the drain and temperature increase in the main heat exchanger, and then enters the metal filter cartridge dust collector.

[0013] In the multi-media heat exchange device of the present invention, under normal working conditions, the temperature of the combustion air is increased from 20°C to 70°C after heat exchange, the temperature of the hydrophobic air is increased from 130°C to 150°C after heat exchange, the temperature of the compressed air is increased from 20°C to 120°C after heat exchange, and the temperature of the flue gas is reduced from 160°C to 80°C after heat exchange.

[0014] The temperature operating window of the metal filter cartridge dust collector of the present invention is 380°C-420°C, and the temperature operating window of the SCR denitration system is 370°C-380°C.

[0015] Compared with the prior art, the present invention has the following advantages and effects: 1. The coupling of drying, incineration and flue gas purification processes can achieve the coordinated resource utilization of two different materials, sludge and wooden formwork on construction sites, and the flue gas can meet the ultra-clean emission requirements, realize material synergy, energy coupling, and achieve the goals of environmental protection, high efficiency, energy saving and stable operation.

[0016] 2. The sludge is dehydrated using a two-stage technology. The first stage is a high-pressure vertical dehydration process without the addition of chemical modifiers. The second stage uses steam for indirect heating, which greatly reduces the energy consumption of sludge drying compared to direct heating of the sludge.

[0017] 3. The wooden formwork at the construction site adopts a three-stage pretreatment process: primary crushing and iron removal, secondary crushing and iron removal, and tertiary crushing. After the above processes, the particle size of the formwork entering the furnace can be uniformly within 2cm×1cm, and the metal content is less than 0.1%.

[0018] 4. Flue gas purification adopts an 8-step process route of "in-furnace desulfurization + in-furnace SNCR denitrification + high-temperature metal filter cartridge dust removal + high-temperature SCR denitrification + dry deacidification + activated carbon injection to remove heavy metals + low-temperature bag dust removal + wet deacidification", which can achieve ultra-clean flue gas emissions: the dust emission concentration can be controlled at 3mg / Nm 3 The SO2 emission concentration can be controlled within 20mg / Nm 3 , HCl emission concentration can be controlled at 10mg / Nm 3 , NOx emission concentration can be controlled at 50mg / Nm 3 .

[0019] 5. The present invention uses the key point of a multi-media heat exchange device to achieve the four goals of flue gas energy recovery, steam-water working fluid energy absorption to improve thermal efficiency, compressed air heat exchange to increase temperature to protect high-temperature metal filter devices, and increase the temperature of combustion-supporting air to improve efficiency, thereby realizing energy recovery of waste heat and stable operation of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0021] Figure 2 It is a schematic structural diagram of a multi-medium heat exchange device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0023] The sludge-coupled resource utilization system of wooden formwork at a construction site of an embodiment of the present invention comprises a wet sludge temporary storage receiving bin 1, a first-level high-pressure vertical dehydration device 2, a second-level steam drying device 3, a dry sludge temporary storage bin 4, a dry sludge scraper conveying device 5, a first-level crushing and iron removal system 7, a second-level crushing and iron removal system 8, a third-level crushing system 9, an incinerator 6, a steam turbine generator set 10, a dry desulfurization system 11, an SNCR denitrification system 12, a metal filter cartridge dust collector 13, an SCR denitrification system 14, a dry deacidification system 15, an activated carbon injection system 16, a bag dust collector 17, a multi-media heat exchange device 18, a wet deacidification system 19 and a chimney 20.

[0024] The sludge outlet of the wet sludge temporary storage receiving bin 1 is connected to the sludge inlet of the first-level high-pressure vertical dehydration equipment 2, the sludge outlet of the first-level high-pressure vertical dehydration equipment 2 is connected to the sludge inlet of the second-level steam drying equipment 3, the sludge outlet of the second-level steam drying equipment 3 is connected to the sludge inlet of the dry sludge temporary storage warehouse 4, and the sludge outlet of the dry sludge temporary storage warehouse 4 is connected to the sludge feeding port of the incinerator 6 through the dry sludge scraper conveying equipment 5.

[0025] The crushed material outlet of the primary crushing and iron removal system 7 is connected to the inlet of the secondary crushing and iron removal system 8, the crushed material outlet of the secondary crushing and iron removal system 8 is connected to the inlet of the tertiary crushing system 9, and the crushed material outlet of the tertiary crushing system 9 is connected to the wood feeding port of the incinerator 6.

[0026] The steam outlet of the incinerator 6 is connected to the steam inlet of the steam turbine generator set 10 , and the steam extraction port of the steam turbine generator set 10 is connected to the steam inlet of the secondary steam drying equipment 3 .

[0027] The flue gas outlet of the incinerator 6 is connected to the flue gas inlet of the dry desulfurization system 11, the flue gas outlet of the dry desulfurization system 11 is connected to the flue gas inlet of the SNCR denitrification system 12, the flue gas outlet of the SNCR denitrification system 12 is connected to the flue gas inlet of the metal cartridge dust collector 13, the flue gas outlet of the metal cartridge dust collector 13 is connected to the flue gas inlet of the SCR denitrification system 14, the flue gas outlet of the SCR denitrification system 14 is connected to the flue gas inlet of the dry deacidification system 15, the flue gas outlet of the dry deacidification system 15 is connected to the flue gas inlet of the activated carbon injection system 16, and the flue gas outlet of the activated carbon injection system 16 is connected to the flue gas inlet of the bag dust collector 17.

[0028] The multi-medium heat exchange device 18 includes a main heat exchanger 181 , a bypass heat exchanger 182 , a switching valve 1 183 and a switching valve 2 184 .

[0029] The main heat exchanger 181 is a shell and tube heat exchanger, and is provided with a flue gas flow channel 1811, a combustion air flow channel 1812, a compressed air flow channel 1813 and a drain flow channel 1814. The flue gas flow channel 1811 is a hot fluid flow channel, the combustion air flow channel 1812, the compressed air flow channel 1813 and the drain flow channel 1814 are all cold fluid flow channels, the flue gas flows through the shell side, and the other three media flow through the tube side.

[0030] The inlet of the flue gas flow duct 1811 is connected to the flue gas outlet of the bag filter 17 , the outlet of the flue gas flow duct 1811 is connected to the flue gas inlet of the wet deacidification system 19 , and the flue gas outlet of the wet deacidification system 19 is connected to the chimney 20 . The inlet of the combustion-supporting air flow channel 1812 is used to supply combustion-supporting air, and the outlet of the combustion-supporting air flow channel 1812 is connected to the air inlet of the incinerator 6; the inlet of the compressed air flow channel 1813 is used to supply compressed air, and the outlet of the compressed air flow channel 1813 is divided into two paths, one path is connected to the hot flow channel inlet of the bypass heat exchanger 182 through the switching valve 2 184, and the other path is connected to the compressed air inlet of the metal filter cartridge dust collector 13 through the switching valve 183; the inlet of the drain flow channel 1814 is connected to the drain outlet of the secondary steam drying equipment 3, and the outlet of the drain flow channel 1814 is connected to the inlet of the cold fluid flow channel of the bypass heat exchanger 182, the outlet of the cold fluid flow channel is connected to the desalted water inlet of the steam turbine generator set 10, and the hot flow channel outlet of the bypass heat exchanger 182 is connected to the compressed air inlet of the metal filter cartridge dust collector 13.

[0031] The working method of the sludge-coupled construction site wooden formwork resource utilization system of the embodiment of the present invention includes the following process: Wet sludge and wooden formwork at construction sites must be pre-treated into fuel before being burned in the furnace.

[0032] 1. Wet sludge pretreatment includes the following steps: (1) Wet sludge is transported to the plant by closed tank trucks and first sent to the wet sludge temporary storage receiving bin 1. A 50×50 grid is installed above the temporary storage receiving bin to filter out large debris in the sludge to avoid affecting the normal operation of the back-end equipment. The wet sludge with a moisture content of 80% is sent to the back-end drying equipment through the plunger pump at the bottom of the receiving bin.

[0033] (2) The sludge in the wet sludge temporary storage receiving bin 1 is sent to the first-level high-pressure vertical dehydration equipment 2 for first-level filter pressing. This equipment is different from the traditional plate and frame filter pressing. The sludge does not need to be diluted with water or modified by adding chemicals. The sludge with a moisture content of 80% is directly filtered after passing through the cloth. The filter pressing power comes from the hydraulic pressure to ensure that the force in the entire filter pressing area is uniform. After the first-level filter pressing, the moisture content of the sludge can be reduced from 80% to 65%, which can greatly reduce the energy consumption of subsequent steam drying and achieve energy saving and efficiency improvement for the entire plant.

[0034] (3) The sludge after the primary filtration enters the secondary steam drying equipment 3 for secondary drying. The secondary steam drying equipment 3 can adopt the mature disc dryer, blade dryer or thin layer dryer in the industry. The moisture content of the sludge can be further reduced from 65% to 40%. The steam required by the secondary steam drying equipment 3 comes from the steam generated after the coupled incineration. Due to the primary high-pressure vertical dehydration process, the steam energy consumption of the secondary drying and dehydration is greatly reduced, and the amount of steam generated by the whole plant can be much greater than the steam energy consumption.

[0035] (4) The dry sludge after secondary drying needs to be sent to the dry sludge temporary storage 4 for temporary storage. This can separate the drying process section and the incineration process section to achieve a buffer between the two. When a process section fails, the operation of the other process section will not be affected for a short time.

[0036] Second, the wooden formwork at the construction site cannot be directly put into the furnace for incineration. On the one hand, this type of material is bulky and cannot be fully burned in the incinerator 6. On the other hand, the formwork is mixed with metal materials such as iron nails and iron sheets. Long-term operation will wear the heating surface and affect the normal slag discharge of the incinerator 6. Therefore, the wooden formwork at the construction site needs to be pre-treated before entering the furnace. The pretreatment of the wooden formwork mud at the construction site includes the following steps: The present invention adopts a three-stage pretreatment process: the wooden formwork of the construction site first enters the primary crushing and iron removal system 7 for primary crushing and iron removal, then enters the secondary crushing and iron removal system 8 for secondary crushing and iron removal, and then enters the tertiary crushing system 9 for tertiary crushing. After the above process stages, the particle size of the wood entering the furnace can be uniformly within 2cm×1cm, and the metal content is less than 0.1%. This process stage can also recycle a large amount of waste metal, which can be recycled and reused in the market to realize the circular economy of resources.

[0037] 3. After pretreatment, the dry sludge with a moisture content of 40% is transported to the incinerator 6 through the sludge scraper conveyor 5, and is incinerated together with the pretreated wooden formwork raw materials of the construction site. The sludge scraper conveyor 5 is welded with a metal scraper, and the contact part between the sludge scraper conveyor 5 and the sludge is made of SUS30408 ​​material, and the bottom is lined with polytetrafluoroethylene plate to enhance corrosion protection.

[0038] The sludge and the broken formwork wood are fed into the incinerator 6 for incineration through different feeding ports. The different feeding ports can effectively control the disposal amount of different materials and improve the flexibility of the system. On the other hand, the process section of fully mixing the materials at the front end can be eliminated to simplify the system process.

[0039] Sludge and wooden formwork materials from construction sites are incinerated in an incinerator 6. The design of the incinerator 6 is the key to the entire coupled resource utilization: on the one hand, it is necessary to consider the full incineration of different materials, and on the other hand, it is necessary to accurately control the furnace temperature to meet the environmental protection requirement of 850°C and avoid high-temperature coking. In view of this, the present invention recommends the use of a circulating fluidized bed furnace with a cyclone separator, which can return the larger particles of combustible materials in the flue gas to the furnace for secondary incineration through cyclone separation, ensuring multiple circulations and thorough incineration of flame-retardant materials. In addition, by adjusting the air volume and temperature of the secondary air, the furnace temperature can be controlled within the range of 850°C to 900°C, achieving efficient and precise temperature control.

[0040] Fourth, the incinerator 6 produces high-quality steam after incineration, and the steam drives the steam turbine generator set 10 to generate electricity, realizing the resource utilization of solid waste. On the other hand, the steam turbine generator set 10 is provided with a low-quality steam extraction port, and the extracted steam enters the secondary steam drying equipment 3 for secondary drying of sludge.

[0041] 5. The flue gas after incineration contains a large amount of dust, sulfur dioxide, NOx and other harmful substances. According to environmental protection requirements, it must be thoroughly treated before it can be discharged. The patent of this invention provides a set of 8-stage series high-efficiency flue gas purification system, which can achieve ultra-clean flue gas emissions.

[0042] The flue gas from the incinerator 6 is sequentially subjected to in-furnace desulfurization of the dry desulfurization system 11, in-furnace SNCR denitrification of the SNCR denitrification system 12, dust removal by the metal cartridge dust collector 13, high-temperature SCR denitrification by the SCR denitrification system 14, dry deacidification by the dry deacidification system 15, heavy metal removal by activated carbon injection by the activated carbon injection system 16, and low-temperature bag dust removal by the bag dust collector 17, and then enters the flue gas flow duct 1811 of the main heat exchanger 181 for cooling. After that, the flue gas at about 80°C is sent to the wet deacidification system 19 for the final wet deacidification treatment, and then is sent to the chimney 20 for discharge.

[0043] In the multi-media heat exchange device 18, there are four types of heat exchange media in the main heat exchanger 181: drain, compressed air, combustion air and flue gas. Under normal working conditions: the combustion air is fed into the inlet of the combustion air flow channel 1812, and the temperature of the combustion air is increased from about 20°C to about 70°C after heat exchange, and then enters the incinerator 6; the drain of the secondary steam drying equipment 3 enters the drain flow channel 1814, and the temperature of the drain is increased from about 130°C to about 150°C after heat exchange, and then enters the cold fluid flow channel of the bypass heat exchanger 182, and then enters the steam turbine generator set 10. The flue gas enters the flue gas flow channel 1811, and the temperature is reduced from about 160°C to about 80°C after heat exchange.

[0044] Considering that the flue gas temperature does not reach 160°C under the system startup condition, but the compressed air of the metal filter cartridge dust collector 13 must be at a temperature of more than 100°C to spray the high-temperature metal filter cartridge, a bypass heat exchanger 182 is set between the hydrophobic and compressed air as a subsystem of the multi-media heat exchange device. Under normal conditions, the switching valve 2 184 is closed, the switching valve 1 183 is opened, and the compressed air at about 20°C is sent to the inlet of the compressed air flow channel 1813. After the compressed air is heated to about 120°C through the main heat exchanger 181, it enters the metal filter cartridge dust collector 13; under the startup condition, the switching valve 2 184 is opened, the switching valve 1 183 is closed, and the compressed air at about 20°C is sent to the inlet of the compressed air flow channel 1813. After the compressed air is heated through the main heat exchanger 181, it enters the bypass heat exchanger 182 to heat the hydrophobic and heat it to about 120°C, and then enters the metal filter cartridge dust collector 13. The classification of drainage, compressed air and combustion air makes full use of the energy of flue gas.

[0045] With this system, the smoke from the incineration of sludge and wooden formwork at construction sites can be discharged ultra-cleanly: the smoke emission concentration can be controlled at 3mg / Nm 3 The SO2 emission concentration can be controlled within 20mg / Nm 3 , HCl emission concentration can be controlled at 10mg / Nm 3 , NOx emission concentration can be controlled at 50mg / Nm 3 . Achieving new heights in industry pollutant control.

[0046] The whole flue gas process is built with the metal filter cartridge dust collector 13 as the core, which is the first in the sludge solid waste industry. Compared with the traditional bag dust collector, the present invention can reduce the dust concentration of 80g / Nm3 to 3mg / Nm3 at a temperature of about 400°C by adding the metal filter cartridge dust collector 13, and the dust removal efficiency reaches 99.99%. Through high-temperature dust removal, the alkali metal atoms originally attached to the dust in the flue gas are removed together, so the back-end flue gas can adopt the low-investment and low-cost high-temperature SCR process.

[0047] Key parameters: The temperature operating window of the metal filter cartridge dust collector 13 is 380° C.-420° C., within which a large amount of dust can be captured.

[0048] The temperature operating window of the SCR denitration system 14 is 370°C-380°C. At this temperature, the denitration catalyst is most active and has the highest denitration efficiency. Different from the conventional low-temperature SCR denitration process in the industry, the process used in the present invention does not involve the process of cooling the flue gas and then heating it up, which saves more than 80% of energy consumption and increases the service life of the catalyst from the conventional 6 months to more than 5 years.

[0049] The flue gas after high-temperature SCR is further cooled by heat exchange. The flue gas at about 160°C is discharged from the boiler and sent to the post-furnace dry deacidification and activated carbon injection heavy metal removal process section, and then sent to the low-temperature bag dust removal to further remove the dust brought by drying and activated carbon injection. After the flue gas passes through the multi-media heat exchange device 18, the flue gas at about 80°C is sent to the wet deacidification system 19 for the final deacidification treatment.

[0050] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A sludge-coupled construction site wood formwork resource utilization system, characterized by: It includes a primary high-pressure vertical dehydration equipment, a secondary steam drying equipment, a dry sludge temporary storage, a primary crushing and iron removal system, a secondary crushing and iron removal system, a tertiary crushing system, an incinerator, a steam turbine generator set, a dry desulfurization system, an SNCR denitrification system, a metal filter cartridge dust collector, an SCR denitrification system, a dry deacidification system, an activated carbon injection system, a bag dust collector, a multi-media heat exchange device and a wet deacidification system; the primary high-pressure vertical dehydration equipment, the secondary steam drying equipment and the dry sludge temporary storage are connected in sequence, and the dry sludge temporary storage is connected to the The sludge feeding port of the incinerator is connected; the first-level crushing and iron removal system, the second-level crushing and iron removal system, and the third-level crushing system are connected in sequence, and the third-level crushing system is connected to the wood feeding port of the incinerator; the steam outlet of the incinerator is connected to the steam inlet of the steam turbine generator set, and the steam extraction port of the steam turbine generator set is connected to the steam inlet of the second-level steam drying equipment; the flue gas outlet of the incinerator is connected to the dry desulfurization system, the dry desulfurization system, the SNCR denitrification system, the metal filter cartridge dust collector, the SCR denitrification system, the dry deacidification system, the activated carbon spray The multi-media heat exchange device includes a main heat exchanger, a bypass heat exchanger, a switching valve 1 and a switching valve 2; the main heat exchanger is provided with a flue gas flow channel, a combustion air flow channel, a compressed air flow channel and a drain flow channel, wherein the flue gas flow channel is a hot fluid flow channel, and the combustion air flow channel, the compressed air flow channel and the drain flow channel are all cold fluid flow channels; the inlet of the flue gas flow channel is connected to the bag dust collector, and the outlet is connected to the flue gas inlet of the wet deacidification system; the outlet of the combustion air flow channel is connected to the air inlet of the incinerator The outlet of the compressed air flow channel is divided into two paths, one of which is connected to the hot flow channel inlet of the bypass heat exchanger through switching valve 2, and the other is connected to the compressed air inlet of the metal filter cartridge dust collector through switching valve 1; the inlet of the drain flow channel is connected to the drain outlet of the secondary steam drying equipment, and the outlet is connected to the inlet of the cold fluid flow channel of the bypass heat exchanger, the outlet of the cold fluid flow channel of the bypass heat exchanger is connected to the desalted water inlet of the steam turbine generator set, and the hot flow channel outlet of the bypass heat exchanger is connected to the compressed air inlet of the metal filter cartridge dust collector.

2. The sludge-coupled construction site wood formwork resource utilization system according to claim 1 is characterized by: It also includes a wet sludge temporary storage and receiving bin, and the sludge outlet of the wet sludge temporary storage and receiving bin is connected to the sludge inlet of the first-level high-pressure vertical dewatering equipment.

3. The sludge-coupled construction site wood formwork resource utilization system according to claim 1 is characterized by: The sludge outlet of the dry sludge temporary storage is connected to the sludge feeding port of the incinerator through the dry sludge scraper conveying equipment.

4. The sludge-coupled construction site wood formwork resource utilization system according to claim 1 is characterized by: It also includes a chimney, and the flue gas outlet of the wet deacidification system is connected to the chimney.

5. The sludge-coupled construction site wood formwork resource utilization system according to claim 1 is characterized by: The main heat exchanger is a shell and tube heat exchanger.

6. The sludge-coupled construction site wood formwork resource utilization system according to claim 1 is characterized by: The secondary steam drying equipment adopts a disc dryer, a paddle dryer or a thin layer dryer.

7. The sludge-coupled construction site wood formwork resource utilization system according to claim 1 is characterized by: The incinerator is a circulating fluidized bed furnace with a cyclone separator.

8. The working method of the sludge coupled construction site wooden formwork resource utilization system according to any one of claims 1 to 7, characterized in that: The process includes the following:

1. Wet sludge pretreatment, including the following steps: (1) The wet sludge is sent to the first-stage high-pressure vertical dewatering equipment for first-stage filter pressing; (2) The sludge after the first-stage filter press enters the second-stage steam drying equipment for secondary drying; (3) The dry sludge after secondary drying needs to be sent to the dry sludge temporary storage warehouse for temporary storage; 2. Pretreatment of wooden formwork mud at construction sites includes the following steps: The wooden formwork at the construction site first enters the primary crushing and iron removal system for primary crushing and iron removal, then enters the secondary crushing and iron removal system for secondary crushing and iron removal, and then enters the tertiary crushing system for tertiary crushing; 3. After pretreatment, the sludge is transported to the incinerator and incinerated together with the pretreated wooden formwork materials of the construction site; 4. The incinerator burns to produce high-quality steam, which drives the steam turbine generator set to generate electricity; the steam extracted from the steam turbine generator set enters the secondary steam drying equipment for secondary drying of sludge; 5. The flue gas from the incinerator is sequentially desulfurized by the dry desulfurization system, denitrated by the SNCR denitrification system, dedusted by the metal cartridge dust collector, denitrated by the SCR denitrification system, deacidified by the dry deacidification system, de-heavy metal removed by the activated carbon injection system, and dedusted by the bag filter dust collector. It then enters the flue gas flow channel of the main heat exchanger for cooling and is then sent to the wet deacidification system for the final wet deacidification treatment. In the multi-media heat exchange device, combustion air is fed into the inlet of the combustion air flow channel, the combustion air is heated up after heat exchange, and then enters the incinerator; the drain of the secondary steam drying equipment enters the drain flow channel, the drain is heated up after heat exchange, and then enters the cold fluid flow channel of the bypass heat exchanger, and then enters the steam turbine generator set; under normal operating conditions, close the switching valve 2, open the switching valve 1, and feed the compressed air into the inlet of the compressed air flow channel, the compressed air enters the metal filter cartridge dust collector after heat exchange and temperature increase in the main heat exchanger; under startup conditions, open the switching valve 2, close the switching valve 1, and feed the compressed air into the inlet of the compressed air flow channel, the compressed air enters the bypass heat exchanger after heat exchange with the drain and temperature increase in the main heat exchanger, and then enters the metal filter cartridge dust collector.

9. The working method according to claim 8, characterized in that: In the multi-media heat exchange device, under normal operating conditions, the temperature of the combustion air rises from 20°C to 70°C after heat exchange, the temperature of the drain rises from 130°C to 150°C after heat exchange, the temperature of the compressed air rises from 20°C to 120°C after heat exchange, and the temperature of the flue gas drops from 160°C to 80°C after heat exchange.

10. The working method according to claim 8, characterized in that: The temperature operating window of the metal filter cartridge dust collector is 380°C-420°C, and the temperature operating window of the SCR denitration system is 370°C-380°C.

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