Waste paper residue energy utilization environment-friendly treatment device system

Abstract

The invention discloses a waste paper residue energy utilization environment-friendly treatment device system, and relates to the technical field of waste paper residue energy utilization. Comprising an incineration system, a waste heat recovery system, a flue gas environment-friendly up-to-standard emission system and an incineration residue recovery system, the tunnel kiln is provided with the front arch and the rear arch, and secondary air is supplied to ensure that waste paper residues are burnt out; the membrane wall incineration hearth is adopted as a part of the main combustion hearth, so that the retention time of high-temperature flue gas combustion is prolonged, and meanwhile, the incineration temperature rise is reduced and the generation of thermal NOx is reduced due to radiation heat absorption of the membrane wall; the modes of the membrane wall incineration hearth, the cooling chamber and the convection bank are adopted, so that heat energy is efficiently recycled, and low-melting-point substances such as inorganic salt contained in incineration residues are prevented from being hung on the wall and blocking a flue; generation of NOx can be effectively reduced through recycling of part of flue gas; through cooperative use of the activated carbon injection port, the quick lime injection port, the bag-type dust collector and the alkaline washing tower, dioxin substances, dust, acid gas and the like in the flue gas are effectively removed, so that the flue gas reaches the standard and is discharged.

Description

Technical Field

[0001] The invention relates to the technical field of waste paper residue energy utilization, and in particular to an environmentally friendly treatment device system for waste paper residue energy utilization. Background Art

[0002] Whether it is office paper, household paper or cartons, paper is very important in our lives. Traditional paper is produced from pulp, but with the deepening of environmental protection concepts and the promotion of environmental protection policies, recycled papermaking has been slowly replacing traditional pulp papermaking. However, in the process of recycled papermaking, a large amount of paper mill waste will be generated. According to statistics, the papermaking waste residue generated by a recycled paper mill each year accounts for about 12% of the recycled paper production. For example, a recycled paper mill with an annual output of 2 million tons will generate about 240,000 tons of paper mill waste residue. If these paper mill waste residues are not properly handled, not only will paper manufacturers face notification fines, or even suspension of business for rectification, but it will also have a serious impact on the environment, thus losing the significance of recycled paper mills contributing to environmental protection.

[0003] Papermaking waste residue has a complex composition, among which waste plastic cannot be degraded. After the papermaking waste residue is crushed by the pre-treatment system and treated by magnetic separation and recovery, the remaining waste paper residue has a combustible component of more than 80%. Incineration is the most commonly used disposal method. Through incineration, the weight of waste paper residue can be reduced by more than 90%. The heat energy recovered from the incineration flue gas can be used to generate steam and electricity for papermaking workshops. It is very environmentally friendly and economical, effectively realizing the resource-based environmental protection treatment of paper mill waste, and bringing low-cost operation and high-value recovery benefits to paper mills.

[0004] The flue gas emitted from the incineration of waste paper residue contains a variety of harmful and toxic substances such as SO2, HCl, Pb, NOx, dioxins and heavy metals. If a simple incineration method is used, it will cause serious secondary pollution. At present, the existing incineration devices for treating waste paper residue cannot completely burn it out, and cannot effectively purify the exhaust flue gas, resulting in a large amount of unburned particulate matter mixed in the flue gas, polluting the environment. It is necessary to conduct in-depth research on combustion methods, combustion optimization and flue gas purification, and adopt targeted technical methods to achieve "clean" incineration of waste paper residue. Based on this, we propose a waste paper residue energy utilization and environmental protection treatment device system.

[0005] After searching the patent pool, our technical staff found the following similar partially related patents:

[0006] First, regarding the patent application document with application number CN201820612335.2, it provides a domestic waste treatment system, and the technical solution is as follows: a domestic waste treatment system, characterized in that it includes a garbage sorting device, a garbage crusher, a fermentation tank, a hot air circulation dryer, a garbage storage pit and a pyrolysis incinerator connected in sequence, the garbage sorting device includes a metal material outlet and a non-metallic material outlet, the metal material outlet is provided with a metal material recovery and processing equipment, the non-metallic material outlet is connected to the garbage crusher, and the fermentation tank is connected to the garbage crusher. A pair of aerobic fermentation tanks are connected in series, a bucket elevator is provided between the garbage storage pit and the pyrolysis incinerator, a plastic screening machine is provided between the bucket elevator and the feed end of the pyrolysis incinerator, the plastic screening machine includes a plastic outlet and a non-plastic outlet, the plastic outlet end is provided with a plastic recovery device, the non-plastic outlet end is connected with the feed end of the pyrolysis incinerator, a combustible gas outlet is provided on one side of the pyrolysis incinerator, a waste residue outlet is provided at the bottom, an organic waste gas adsorption device is provided at one end of the combustible gas outlet, and a waste residue brick making machine is provided at one end of the waste residue outlet. The comparative document mainly describes a domestic waste treatment system, and the treatment method is pyrolysis without energy recovery. The device only uses simple adsorption treatment for flue gas treatment, which is difficult to meet the requirements of standard emissions, and is therefore prone to environmental pollution.

[0007] Secondly, the patent application document with application number CN201120302150.X provides a waste paper residue incineration device. This patent mainly treats waste paper residue before entering the furnace, and does not involve the structure of the incinerator and the waste heat boiler. In addition, the device does not carry out targeted treatment of flue gas, so it cannot effectively remove the smoke in the flue gas and harmful substances such as SO2, HCl, Pb, NOx, dioxins and heavy metals generated by incineration, which causes great pollution to the environment and does not meet the actual waste paper residue treatment needs.

[0008] Similarly, the patent application document with application number CN202120116130.7 provides an energy-saving and environmentally friendly paper slag incineration device, including an incineration device body and a filter tank, a fan is installed at the upper end of the filter tank, a first connecting pipe is installed at the input end of the fan, and the fan and the incineration device body are connected through the first connecting pipe, a second connecting pipe is installed at the output end of the fan, and the fan and the filter tank are connected through the second connecting pipe, a first motor is installed at the lower side of one side of the filter tank, and the output end of the first motor A stirring rod is installed, and the stirring rod is rotatably connected to the filter tank. A porous plate is installed inside the filter tank and above the stirring rod. A liquid inlet pipe is installed on one side of the upper end of the filter tank. A first solenoid valve is installed at the position of the liquid inlet pipe close to the filter tank. A liquid discharge pipe is installed at the lower end of one side of the filter tank. A second solenoid valve is installed at the position of the liquid discharge pipe close to the filter tank. A third connecting pipe is installed at the upper end of the filter tank. An activated carbon filter body is installed at one end of the third connecting pipe away from the filter tank. An exhaust pipe is installed on one side of the activated carbon filter body. This patent only solves the flue gas treatment after the incineration of waste paper residues, and does not explain how to incinerate waste paper residues and the energy recovery after incineration.

[0009] Finally, the patent application document with application number CN201510113572.5 is an environmentally friendly garbage incineration equipment for paper mills and its working method, which is characterized by: including a garbage feeding tank, and a garbage feeding pipe connected to the lower end of the garbage feeding tank, and a sorting rotating motor arranged on the left side of the garbage feeding tank, and a sorting rotating shaft arranged at the bottom of the garbage feeding tank and connected to the sorting rotating motor, and a sorting plate connected to the sorting rotating shaft, and a feeding pipe bracket fixed on the four sides of the garbage feeding tank for support, and a preheating sealed tank connected to the right end of the garbage feeding pipe, and a tank body bracket arranged at the right end of the preheating sealed tank, and a combustion furnace arranged on the right side of the tank body bracket, and a combustion air intake fan arranged on the left side of the combustion furnace, and a smoke conveying pipe with one end connected to the top of the combustion furnace and the other end connected to the top of the left end of the preheating sealed tank, and a smoke exhaust fan arranged on the smoke conveying pipe and with the bottom end mounted on the preheating sealed tank, and a smoke exhaust pipe connected to the top of the right end of the preheating sealed tank, and another smoke exhaust fan connected to the smoke exhaust pipe. The exhaust gas treatment tank is connected at one end, and a smoke outlet tank is connected to the upper right end of the exhaust gas treatment tank, and a combustion furnace slag pipe is arranged at the bottom of the combustion furnace, and a tail gas tank slag pipe is arranged at the right bottom of the exhaust gas treatment tank, and a control valve is arranged in the tail gas tank slag pipe, the tail gas tank slag pipe and the combustion furnace slag pipe are connected to each other, the preheating sealing tank includes a fixed bin, and a rotating preheating bin rotatable inside the fixed bin, and a flue gas circulation plate arranged between the fixed bin and the rotating preheating bin, and a rotating pushing plate arranged in the rotating preheating bin, and a slag collecting plate arranged at the lower end of the fixed bin, and a slag dropping port uniformly distributed on the bottom of the fixed bin in the transverse direction, and a preheating bin rotating tooth fixedly connected to the left end of the rotating preheating bin, and a gear driving mechanism arranged on the outside of the fixed bin for driving the preheating bin rotating tooth to rotate, the exhaust gas treatment tank includes a smoke collecting bin, and an extended smoke collecting pipe arranged in the smoke collecting bin, and a water tank arranged at the bottom of the smoke collecting bin, and a nitrate-alkali filter and a basalt fiber filter layer penetrated by the extended smoke collecting pipe. The comparative document mainly describes the incineration treatment using two-stage rotary treatment, using the flue gas generated by the first-stage rotary incineration to heat the waste paper residues in the other stage of rotary preheating. In addition, the device uses an exhaust gas treatment tank to reduce the emission of harmful substances in the flue gas through reaction with harmful substances and collection in a water tank. Although this method can reduce the emission of harmful substances, the treatment efficiency is not high. Harmful substances will still remain in the emitted flue gas, affecting the surrounding environment, and it is difficult for flue gas emissions to meet the standards.

[0010] In summary, the main shortcomings of these patent application documents include low heat recovery efficiency, poor flue gas treatment effect, inability to effectively remove harmful substances, and greater impact on the environment, etc. Therefore, it is necessary to improve and perfect these shortcomings in order to provide a more efficient and environmentally friendly waste paper residue treatment device and method. Summary of the invention

[0011] The purpose of the present invention is to provide an environmentally friendly treatment device system for energy utilization of waste paper residues, so as to solve the problem that the existing incineration device for treating waste paper residues proposed in the above background technology cannot completely burn it and cannot effectively purify the discharged flue gas, resulting in a large amount of unburned particulate matter mixed in the flue gas, polluting the environment.

[0012] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a waste paper residue energy utilization and environmental protection treatment device system, including an incineration system, a waste heat recovery system, a flue gas environmental protection standard emission system and an incineration residue recovery system; the incineration system includes a feeding hopper and a feeding gate arranged at its bottom discharge port, a reciprocating grate is arranged below the feeding gate, and a tunnel kiln and a membrane wall incineration furnace are arranged above the reciprocating grate from bottom to top; the waste heat recovery system includes a membrane wall incineration furnace and a cooling chamber connected to its outlet, the flue gas outlet end of the cooling chamber is connected to a convection tube bundle, and the flue gas of the convection tube bundle The outlet end is connected to an economizer through a flue; the environmentally friendly flue gas emission system includes a bag dust collector connected to the flue gas outlet end of the economizer through a flue, and an activated carbon injection inlet and a quicklime injection inlet are arranged on the flue before entering the bag dust collector. The flue gas outlet end of the bag dust collector is connected to an alkali washing tower through the flue, and a flue gas pre-spray nozzle is arranged on the flue entering the alkali washing tower, and the flue gas outlet end of the alkali washing tower is connected to the induced draft fan through the flue and then to the chimney; the incineration residue recovery system includes a first water-cooled scraper conveyor, a second water-cooled scraper conveyor, a roller slag cooler, and a screw conveyor.

[0013] Furthermore, the feeding gate is vertically arranged on the left side wall at the outlet of the feeding hopper; the reciprocating grate is obliquely arranged and divided into an upper and lower part, which operate independently, the upper part is a preheating section and is connected to a preheating section reducer through a connecting rod at the bottom, and the lower part is a combustion and burnout section and is connected to a combustion and burnout section reducer through a connecting rod at the bottom, and the operating speed of the combustion and burnout section reducer is lower than that of the preheating section reducer; a plurality of primary air inlets are arranged below the reciprocating grate along its length direction; an ash hopper and an ash leakage hopper are arranged below the reciprocating grate, and the bottoms of the ash hopper and the ash leakage hopper are respectively connected to the incineration residue recovery system through pipelines.

[0014] Preferably, the reciprocating grate is arranged obliquely downward at an angle of 15° to the horizontal plane, and includes multiple groups of fixed grate plates and running grate plates.

[0015] Furthermore, a front arch and a rear arch are arranged on the furnace wall of the tunnel kiln, which together constitute the main combustion zone of the tunnel kiln. The front arch is arranged close to the side of the charging hopper and is higher, and the rear arch is arranged on the rear wall side of the tunnel kiln. A secondary air nozzle is arranged on the upper part of the rear arch.

[0016] Furthermore, multiple primary air inlets are commonly connected to a primary air dry pipe, the inlet end of the primary air dry pipe is connected to a primary combustion-supporting fan, and the primary air dry pipe is also connected to a recirculation fan, and the inlet end of the recirculation fan is connected to the air outlet duct of the induced draft fan.

[0017] Preferably, the cooling chamber is composed of a membrane wall, and a thinning pipe is provided at the flue gas inlet end of the convection tube bundle so that the flue gas can enter the convection tube bundle and laterally flush the convection tube bundle. The cooling chamber and the bottom of the ash hopper of the convection tube bundle and the bottom ash hopper of the economizer are all provided with ash pipes and are respectively connected to the incineration residue recovery system.

[0018] Preferably, the activated carbon injection inlet and the quicklime injection inlet are respectively sprayed with activated carbon powder and quicklime powder, and the multiple ash hoppers at the bottom of the bag filter are commonly connected to a screw conveyor; the flue gas pre-spray nozzle sprays circulating alkali solution into the flue, the alkali washing tower is a glass fiber reinforced plastic tower and adopts a filler type, and the alkali solution is circulated and sprayed into the alkali washing tower, a part of the flue gas at the flue gas outlet end of the induced draft fan is introduced into the primary air drying pipe by the flue gas recirculation fan, and the remaining flue gas enters the chimney for emission that meets the standards; the flue gas circulation rate is 5-20% of the total exhaust gas volume, which can reduce the NO generation by 10-90%.

[0019] Furthermore, a SNCR denitrification spray gun interface is provided in the membrane wall incineration furnace. When the flue gas recirculation cannot meet the flue gas emission requirements, urea solution is sprayed into the furnace to remove NOx in the flue gas at high temperature.

[0020] Preferably, the high-temperature flue gas temperature at the outlet of the membrane wall incineration furnace is ≥850°C, and is cooled to 160°C through the cooling chamber, convection tube bundle, and economizer; activated carbon powder and quicklime powder are sprayed into the activated carbon injection inlet and quicklime injection inlet respectively, the bag filter is used for cooling and dust removal, and circulating alkali liquid is sprayed into the flue gas pre-spray nozzle to reduce the flue gas temperature to below 80°C; after passing through the alkali washing tower, the flue gas temperature is reduced to below 60°C.

[0021] Preferably, the first water-cooled scraper conveyor is respectively connected to the ash hopper and the ash hopper through corresponding ash dropping pipes; the second water-cooled scraper conveyor is respectively connected to the ash dropping pipe at the bottom of the ash hopper of the cooling chamber, the ash dropping pipe at the bottom of the convection tube bundle and the ash dropping pipe at the bottom of the economizer; the second water-cooled scraper conveyor is connected to the first water-cooled scraper conveyor, and the outlet end of the first water-cooled scraper conveyor is connected to a drum slag cooler; the screw conveyor is connected to multiple ash hoppers at the bottom of the bag collector through corresponding pipelines.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] In the process of converting waste paper slag into energy, the front arch and the rear arch of the tunnel kiln arranged by the present invention and the supply of secondary air ensure the combustion of the waste paper slag; the membrane wall incineration furnace is used as a part of the main combustion furnace, which is not only beneficial to prolonging the residence time of high-temperature flue gas combustion, but also reduces the combustion temperature rise and reduces the generation of thermal NOx due to the radiation heat absorption of the membrane wall; the membrane wall incineration furnace, cooling chamber and convection tube bundle are used to not only efficiently recover heat energy, but also help prevent low-melting-point substances such as inorganic salts contained in the waste paper slag incineration residue from hanging on the wall and blocking the flue gas channel; the recycling of part of the flue gas can effectively reduce the generation of NOx; the coordinated use of the activated carbon injection port, the quicklime injection port, the bag filter and the alkali washing tower can effectively remove dioxins, dust, acidic gases and the like in the flue gas, so that the flue gas meets the emission standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the waste heat recovery system and the flue gas environmentally friendly emission system;

[0025] Figure 2 This is a schematic diagram of the incineration system;

[0026] Figure 3 for Figure 2 A magnified view of middle;

[0027] Figure 4 for Figure 1 Enlarged view of middle B;

[0028] Figure 5 for Figure 1 Enlarged view of middle C;

[0029] In the figure: Incineration system-1, charging hopper-11, feeding gate-12, reciprocating grate-13, preheating section reducer-131, combustion and burnout section reducer-132, tunnel kiln-14, front arch-141, rear arch-142, secondary air nozzle-143, membrane wall incineration furnace-15, SNCR denitrification spray gun interface-151, primary air inlet-16, ash hopper-17, ash hopper-18, waste heat recovery system-2, cooling chamber-2 1. Convection tube bundle-22, economizer-23, ash drop pipe-24, flue gas environmentally friendly emission system-3, activated carbon injection inlet-31, quicklime injection inlet-32, bag filter-33, flue gas pre-spray nozzle-34, alkali washing tower-35, induced draft fan-36, chimney-37, incineration residue recovery system-4, first water-cooled scraper conveyor-41, second water-cooled scraper conveyor-42, roller slag cooler-43, screw conveyor-44. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0031] Please refer to Figure 1-5 , Figure 1 This is a schematic diagram of the waste heat recovery system and the flue gas environmentally friendly emission system; Figure 2 This is a schematic diagram of the incineration system; Figure 3 for Figure 2 A magnified view of middle; Figure 4 for Figure 1 Enlarged view of middle B; Figure 5 for Figure 1 Enlarged view of C in the middle.

[0032] The present invention provides an environmentally friendly treatment device system for energy utilization of waste paper residues, which is used to ensure the complete combustion of waste paper residues and purify flue gas during the process of energy utilization of waste paper residues to avoid pollution to the environment; it includes an incineration system 1, a waste heat recovery system 2, a flue gas environmentally friendly emission system 3 and an incineration residue recovery system 4.

[0033] The incineration system 1 includes a feeding hopper 11, a feeding gate 12, a reciprocating grate 13, a tunnel kiln 14, and a membrane wall incineration furnace 15; the waste paper slag is lifted into the feeding hopper 11 by a bucket elevator, the bottom of the feeding hopper 11 is a discharge port, which is used to discharge the waste paper slag added to the feeding hopper 11, and a reciprocating grate 13 is arranged downwardly at an angle of 15° to the horizontal plane to the lower left, and a vertically movable feeding gate 12 is arranged on the left side wall at the outlet of the feeding hopper 11, and the amount of waste paper slag added to the reciprocating grate 13 can be adjusted by lifting and lowering the feeding gate 12; the reciprocating grate 13 is obliquely arranged and divided into upper and lower parts, each of which operates independently, the upper part of which is a preheating section for preheating the waste paper slag, and a preheating section reducer 131 is connected to the bottom surface through a connecting rod, and the lower part is a combustion burnout section for the waste paper slag The reciprocating grate 13 is used for combustion and burnout, and a combustion and burnout section reducer 132 is connected to its bottom surface through a connecting rod, and the operating speed of the combustion and burnout section reducer 132 is lower than the operating speed of the preheating section reducer 131, so that the waste paper slag in the preheating section has a faster downward speed and a slower running speed when reaching the combustion and burnout section, which is conducive to the full combustion of the material; the reciprocating grate 13 forms a tunnel kiln 14 between the furnace walls above it, and a membrane wall incineration furnace 15 is arranged above the main combustion zone of the tunnel kiln 14, and a plurality of primary air inlets 16 are arranged below the reciprocating grate 13. The plurality of primary air inlets 16 use isobaric air supply to allow the waste paper slag sent to the reciprocating grate 13 through the feeding hopper 11 and the feeding gate 12 to be burned on the reciprocating grate 13, and the high-temperature flue gas generated by the burned waste paper slag continues to be burned in the tunnel kiln 14 and the membrane wall incineration furnace 15, so that the waste paper slag is fully burned and burnt out.

[0034] In order to improve the combustion efficiency of waste paper residue, the furnace wall of the tunnel kiln 14 is provided with a front arch 141 and a rear arch 142. The front arch 141 is arranged close to the side of the feeding hopper 11 and is relatively high. The rear arch 142 is arranged on the rear wall side of the tunnel kiln 14. The front arch 141 and the rear arch 142 together constitute the main combustion zone of the tunnel kiln 14. The secondary air nozzle 143 arranged at the upper part of the rear arch 142 is used to inject secondary air to guide the high-temperature flue gas in the furnace to the front arch 141, and at the same time, oxygen is added to the high-temperature flue gas to make it The high-temperature flue gas is fully burned and burnt out, and the high-temperature flue gas is guided to the front arch 141. Through the reflection effect of the front arch 141, the high-temperature flue gas sweeps the new waste paper slag on the reciprocating grate 13 through the hopper 11 and the feeding gate 12, and heats, evaporates and ignites it; at the same time, the flue gas generated enters the rear arch 142 under the effect of the reflection force, and flows to the front arch 141 under the effect of the reflection force of the rear arch 142. The flue gas vortex generated repeatedly in this way can ensure that the waste paper slag on the reciprocating grate 13 is fully burned and burnt out. The low and short rear arch 142 not only guides the high-temperature flue gas generated by the combustion of waste paper slag on the reciprocating grate 13 into the front of the furnace, but also has its reflection effect, reflecting the high-temperature flue gas to the reciprocating grate 13, so that the waste paper slag on the grate is fully burned and burnt out.

[0035] The reciprocating grate 13 includes a plurality of fixed grate plates and running grate plates. The waste paper slag on the fixed grate plates are pushed downward from top to bottom step by step by the running grate plates. The reciprocating grate 13 is in an obvious downward-sloping step shape to facilitate the downward movement of the waste paper slag. At the tail of the reciprocating grate, the waste paper slag falls into the ash hopper 17 arranged below after being burned out. In the process of the running grate plates pushing the waste paper slag downward, the waste paper slag on the reciprocating grate 13 can be continuously stirred to make the waste paper slag burn more fully. At the same time, multiple primary air inlets 16 at the lower part of the reciprocating grate 13 are arranged along the length direction of the reciprocating grate 13, so that air can be supplied in stages along the length direction during the combustion process of the reciprocating grate 13, and equal-pressure air distribution with different air volumes can be performed according to the drying, pre-combustion, combustion, and burnout processes of the waste paper slag on the reciprocating grate 13 to ensure that the oxygen demand in the combustion process is sufficient and the combustion is complete; during normal operation, the air supply volume in the middle section of the grate is relatively large, and the air supply volume in the front and rear sections is relatively small, especially in the waste paper slag preheating and drying section at the head of the fire bed, which basically does not require air supply.

[0036] During the combustion of waste paper residue, in order to control the generation of NOx during the combustion process, multiple primary air inlets 16 are commonly connected to a primary air drying pipe, the inlet end of the primary air drying pipe is connected to a primary combustion-supporting fan, and the primary air drying pipe is also connected to a recycling fan, and the inlet end of the recycling fan is connected to the air outlet duct of the induced draft fan 36, so that the flue gas after the induced draft fan 36 can be partially extracted by the recycling fan and sent to the primary air drying pipe, and then mixed with the primary air and sent to the primary air inlet 16 at the lower part of the reciprocating grate 13.

[0037] In addition to the ash hopper 17, an ash hopper 18 is also provided below the reciprocating grate 13 and the multiple primary air inlets 16. After the waste paper residue is completely burned on the reciprocating grate 13, it falls into the ash hopper 17. At the same time, the ash leaked from the reciprocating grate 13 during the combustion process enters the ash hopper 18. The ash in the ash hopper 17 and the ash hopper 18 enters the incineration residue recovery system 4 through their respective ash dropping pipes for recovery.

[0038] The waste heat recovery system 2 includes a membrane wall incineration furnace 15, a cooling chamber 21, a convection tube bundle 22 and an economizer 23; the smoke outlet end of the membrane wall incineration furnace 15 is directly connected to the cooling chamber 21, the cooling chamber 21 is composed of a membrane wall, the smoke outlet end of the cooling chamber 21 is connected to the convection tube bundle 22, the smoke inlet end of the convection tube bundle 22 is provided with a loosening pipe so that the smoke can enter the convection tube bundle 22 to laterally flush the convection tube bundle, and the smoke outlet end of the convection tube bundle 22 is connected to the economizer 23 through a flue; the high-temperature smoke generated by the incineration of waste paper slag on the reciprocating grate 13 continues to burn and burn out in the membrane wall incineration furnace 15, and the high-temperature smoke temperature at the outlet of the membrane wall incineration furnace 15 is ≥850°C, and enters the cooling chamber 21 through the outlet of the membrane wall incineration furnace 15. The cooling chamber 21 is composed of a membrane wall. The high-temperature flue gas above 850°C is cooled by heat radiation in the cooling chamber 21 on the one hand, and the dust carried in the flue gas is settled down on the other hand, and falls into the incineration residue recovery system 4 through the ash dropping pipe 24 arranged below the ash dropping hopper at the bottom; the flue gas after cooling and dust reduction in the cooling chamber 21 enters the convection tube bundle 22 through the exhaust pipe at the entrance of the convection tube bundle 22 to continue convection heat transfer cooling, and the dust in the flue gas continues to settle and falls into the incineration residue recovery system 4 through the ash dropping pipe 24 arranged below the ash dropping hopper at the bottom; the flue gas coming out of the convection tube bundle 22 enters the economizer 23 through the flue, and the flue gas temperature is further reduced in the economizer 23. At the same time, the boiler feed water is heated by the economizer 23 to further recover the energy carried in the flue gas and improve the thermal efficiency of the system.

[0039] At the same time, the combined use of the membrane wall incineration furnace 15, the cooling chamber 21, and the convection tube bundle 22 can effectively prevent the problems of incineration residues hanging on the wall and blocking the flue gas channel.

[0040] The environmentally friendly flue gas emission system 3 includes an activated carbon injection inlet 31, a quicklime injection inlet 32, a bag filter 33, a flue gas pre-spray nozzle 34, an alkali washing tower 35, an induced draft fan 36, and a chimney 37; the bottom ash hopper of the economizer 23 is provided with an ash dropping pipe 24, and the bottom end is connected to an incineration residue recovery system 4; the flue gas outlet end of the economizer 23 is connected to the bag filter 33 through a flue, and an activated carbon injection inlet 31 and a quicklime injection inlet 32 ​​are provided in the flue before entering the bag filter 33, the flue gas outlet end of the bag filter 33 is connected to the alkali washing tower 35 through the flue, and a flue gas pre-spray nozzle 34 is provided on the flue entering the alkali washing tower 35, the flue gas outlet end of the alkali washing tower 35 is connected to the induced draft fan 36 through the flue, and the flue gas outlet end of the induced draft fan 36 is connected to the chimney 37 through the flue.

[0041] The flue gas cooled to 160°C by the economizer 23 is sprayed with activated carbon powder and quicklime powder respectively through the activated carbon spray port 31 and the quicklime spray port 32 arranged on the flue before entering the bag filter 33, so as to adsorb and desorb dioxins in the flue gas and remove part of the acidic gas in the flue gas. Then the flue gas enters the bag filter 33 for dust removal; the flue gas after dust removal by the bag filter 33 enters the alkali washing tower 35 through the flue; the alkali washing tower 35 is a glass fiber reinforced plastic tower. Since the normal working temperature of the glass fiber reinforced plastic tower is about 80°C, a flue gas pre-spray nozzle 34 is arranged on the flue in front of the alkali washing tower 35, and circulating alkali liquid is sprayed into the flue to reduce the flue gas temperature to below 80°C. The alkali washing tower 35 adopts a packing type, and a certain concentration of alkali solution is circulated and sprayed into the alkali washing tower 35. The acid gas in the flue gas reacts with the alkali solution in the alkali washing tower 35 to neutralize. The flue gas below 60°C after the acid gas is removed passes through the induced draft fan 36, and a part of it is introduced into the primary air drying duct by the flue gas recycling fan. The flue gas circulation rate is usually 5-20% of the total exhaust gas volume, which can reduce the NO generation by 10-90%; the remaining flue gas enters the chimney 37 to meet the emission standards.

[0042] In addition, an SNCR denitrification spray gun interface 151 is arranged in the membrane wall incineration furnace. When the flue gas recirculation cannot meet the flue gas emission requirements, urea solution is sprayed into the furnace to remove NOx in the flue gas at high temperature, so that the exhaust flue gas meets the emission requirements of GB18485.

[0043] The multiple ash hoppers at the bottom of the bag filter 33 respectively enter the incineration residue recovery system 4 through corresponding pipelines for recovery treatment.

[0044] The incineration residue recovery system 4 includes a first water-cooled scraper conveyor 41, a second water-cooled scraper conveyor 42, a roller slag cooler 43, and a screw conveyor 44; the first water-cooled scraper conveyor 41 is connected to the ash hopper 17 and the ash hopper 18 through corresponding ash dropping pipes, respectively, for receiving the residue after incineration of the incineration system 1, and the outlet end of the first water-cooled scraper conveyor 41 is connected to the roller slag cooler 43, which is used to cool the residue received by the first water-cooled scraper conveyor 41 and then pack it; the second water-cooled scraper conveyor 42 is respectively connected to the ash dropping pipe 24 at the bottom of the ash hopper of the cooling chamber 21, the ash dropping pipe 24 at the bottom of the ash hopper of the convection tube bundle 22, and the ash dropping pipe 24 at the bottom of the ash hopper of the economizer 23, for receiving the The smoke dust falling in the cooling chamber 21, the convection tube bundle 22, and the economizer 23, the second water-cooled scraper conveyor 42 is connected to the first water-cooled scraper conveyor 41 and then connected to the drum cooler 43. The smoke dust received by the second water-cooled scraper conveyor 42 is packaged after being cooled by the first water-cooled scraper conveyor 41 and the drum cooler 43; the screw conveyor 44 is connected to the multiple ash hoppers at the bottom of the bag-type dust collector 33 through corresponding pipelines, and is used to receive the dust separated by the bag-type dust collector 33. Because the smoke enters the flue before the bag-type dust collector 33 and is sprayed with activated carbon and quicklime powder, which is hazardous waste residue, a separate screw conveyor 38 is set, and the material conveyed and collected by the screw conveyor 38 are subjected to corresponding incineration or landfill treatment.

[0045] In the process of converting waste paper slag into energy, the front arch and the rear arch of the tunnel kiln arranged by the present invention and the supply of secondary air ensure the combustion of the waste paper slag; the membrane wall incineration furnace is used as a part of the main combustion furnace, which is not only beneficial to prolonging the residence time of high-temperature flue gas combustion, but also reduces the combustion temperature rise and reduces the generation of thermal NOx due to the radiation heat absorption of the membrane wall; the membrane wall incineration furnace, cooling chamber and convection tube bundle are used to not only efficiently recover heat energy, but also help prevent low-melting-point substances such as inorganic salts contained in the waste paper slag incineration residue from hanging on the wall and blocking the flue gas channel; the recycling of part of the flue gas can effectively reduce the generation of NOx; the coordinated use of the activated carbon injection port, the quicklime injection port, the bag filter and the alkali washing tower can effectively remove dioxins, dust, acidic gases and the like in the flue gas, so that the flue gas meets the emission standards.

[0046] Although the embodiments of the present invention have been shown and described, it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, it can be understood by ordinary technicians in this field that all other embodiments obtained by making various changes, modifications, substitutions and variations to these embodiments without departing from the principles and spirit of the present invention and without making creative work, all belong to the scope of protection of the present invention.

Claims

1. A waste paper residue energy utilization and environmental protection treatment device system, characterized by: The invention comprises an incineration system (1), a waste heat recovery system (2), a flue gas environmentally friendly emission system (3) and an incineration residue recovery system (4); the incineration system (1) comprises a feeding hopper (11) and a feeding gate (12) arranged at a discharge port at its bottom, a reciprocating grate (13) is arranged below the feeding gate (12), and a tunnel kiln (14) and a membrane wall incineration furnace (15) are arranged above the reciprocating grate (13) in order from bottom to top; the waste heat recovery system (2) comprises a membrane wall incineration furnace (15) and a cooling chamber (21) connected to its outlet, the flue gas outlet end of the cooling chamber (21) is connected to a convection tube bundle (22), and the flue gas outlet end of the convection tube bundle (22) is connected to an economizer (23) through a flue; the flue gas recycling system (21) comprises a condenser (22) and a heat exchanger (23) connected to the flue gas outlet end of the cooling chamber (21); The standard-compliant emission guarantee system (3) comprises a bag filter (33) connected to the flue gas outlet of the economizer (23) through a flue, an activated carbon injection port (31) and a quicklime injection port (32) are arranged on the flue before entering the bag filter (33), the flue gas outlet of the bag filter (33) is connected to an alkali washing tower (35) through the flue, and a flue gas pre-spray nozzle (34) is arranged on the flue entering the alkali washing tower (35), the flue gas outlet of the alkali washing tower (35) is connected to an induced draft fan (36) through the flue and then connected to a chimney (37); the incineration residue recovery system (4) comprises a first water-cooled scraper conveyor (41), a second water-cooled scraper conveyor (42), a roller slag cooler (43), and a screw conveyor (44).

2. The waste paper residue energy utilization and environmental protection treatment device system according to claim 1 is characterized by: The feeding gate (12) is vertically arranged on the left side wall at the outlet of the feeding hopper (11); the reciprocating grate (13) is obliquely arranged and divided into upper and lower parts, each of which operates independently, the upper part is a preheating section and is connected to the preheating section reducer (131) through a connecting rod at the bottom, and the lower part is a combustion and burnout section and is connected to the combustion and burnout section reducer (132) through a connecting rod at the bottom, and the operation speed of the combustion and burnout section reducer (132) is lower than that of the preheating section reducer (131); a plurality of primary air inlets (16) are arranged below the reciprocating grate (13) along its length direction; an ash hopper (17) and an ash drain hopper (18) are arranged below the reciprocating grate (13), and the bottoms of the ash hopper (17) and the ash drain hopper (18) are respectively connected to the incineration residue recovery system (4) through pipelines.

3. The waste paper residue energy utilization and environmental protection treatment device system according to claim 2 is characterized by: The reciprocating grate (13) is arranged obliquely downward at an angle of 15° to the horizontal plane, and comprises a plurality of groups of fixed grate plates and running grate plates.

4. The waste paper residue energy utilization and environmental protection treatment device system according to claim 3 is characterized by: The tunnel kiln (14) is provided with a front arch (141) and a rear arch (142) on the furnace wall, which together form the main combustion zone of the tunnel kiln (14); the front arch (141) is arranged close to one side of the charging hopper (11) and is relatively high; the rear arch (142) is arranged on the rear wall side of the tunnel kiln (14); and a secondary air nozzle (143) is arranged on the upper part of the rear arch (142).

5. The waste paper residue energy utilization and environmental protection treatment device system according to claim 4 is characterized by: A plurality of primary air inlets (16) are commonly connected to a primary air drying pipe, the inlet end of which is connected to a primary combustion-supporting fan. The primary air drying pipe is also connected to a recirculation fan, and the inlet end of which is connected to the air outlet duct of the induced draft fan (36).

6. The waste paper residue energy utilization and environmental protection treatment device system according to claim 5 is characterized by: The cooling chamber (21) is composed of a membrane wall, and a flue gas inlet end of the convection tube bundle (22) is provided with a thinning pipe so that the flue gas can enter the convection tube bundle (22) and laterally flush the convection tube bundle. The bottom of the ash hopper of the cooling chamber (21) and the convection tube bundle (22) and the bottom ash hopper of the economizer (23) are all provided with ash dropping pipes (24) and are respectively connected to the incineration residue recovery system (4).

7. The waste paper residue energy utilization and environmental protection treatment device system according to claim 6 is characterized by: The activated carbon spray inlet (31) and the quicklime spray inlet (32) are sprayed with activated carbon powder and quicklime powder respectively; the multiple ash hoppers at the bottom of the bag filter (33) are respectively connected to the screw conveyor (44); the flue gas pre-spray nozzle (34) sprays circulating alkali solution into the flue; the alkali washing tower (35) is a glass fiber reinforced plastic tower and adopts a filler type, and alkali solution is circulated and sprayed into the alkali washing tower (35); part of the flue gas at the flue gas outlet end of the induced draft fan (36) is introduced into the primary air drying pipe by the flue gas recirculation fan, and the rest enters the chimney (37) to meet the emission standards; the flue gas circulation rate is 5-20% of the total exhaust gas volume, which can reduce the NO generation by 10-90%.

8. The waste paper residue energy utilization and environmental protection treatment device system according to claim 7 is characterized by: The membrane wall incineration furnace (15) is provided with an SNCR denitration spray gun interface (151). When the flue gas recirculation cannot meet the flue gas emission requirements, urea solution is sprayed into the furnace to remove NOx in the flue gas at high temperature.

9. The waste paper residue energy utilization and environmental protection treatment device system according to claim 8 is characterized by: The high-temperature flue gas at the outlet of the membrane wall incineration furnace (15) has a temperature of ≥850°C, and is cooled to 160°C through the cooling chamber (21), the convection tube bundle (22), and the economizer (23); activated carbon powder and quicklime powder are sprayed into the activated carbon spray inlet (31) and the quicklime spray inlet (32) respectively, the bag filter (33) is used for cooling and dust removal, and circulating alkali liquid is sprayed into the flue gas pre-spray nozzle (34) to reduce the flue gas temperature to below 80°C; after passing through the alkali washing tower (35), the flue gas temperature is reduced to below 60°C.

10. The waste paper residue energy utilization and environmental protection treatment device system according to claim 9, characterized in that: The first water-cooled scraper conveyor (41) is respectively connected to the ash hopper (17) and the ash funnel (18) through corresponding ash dropping pipes; the second water-cooled scraper conveyor (42) is respectively connected to the ash dropping pipe (24) at the bottom of the ash hopper of the cooling chamber (21), the ash dropping pipe (24) at the bottom of the ash hopper of the convection tube bundle (22), and the ash dropping pipe (24) at the bottom of the ash hopper of the economizer (23); the second water-cooled scraper conveyor (42) is connected to the first water-cooled scraper conveyor (41), and the outlet end of the first water-cooled scraper conveyor (41) is connected to a roller slag cooler (43); the screw conveyor (44) is connected to multiple ash hoppers at the bottom of the bag filter (33) through corresponding pipelines.

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