Operation process for coupling garden waste recycling and waste incineration

Abstract

The invention discloses an operation technology for coupling garden waste recycling and waste incineration. The operation technology comprises the following steps that S1, garden waste is divided into high-quality garden waste and low-quality garden waste; s2, the high-quality garden waste enters a drying machine, a pyrolysis machine and a condenser, and pyrolytic carbon, pyroligneous liquor and non-condensable gas are generated; s3, after the low-quality garden waste is dried, granulation treatment is conducted through a granulator; s4, the household garbage and the non-condensable gas enter an incinerator to be incinerated, and high-temperature flue gas is generated; s5, the hot flue gas enters a second flue and a pyrolysis machine and then enters a third flue to be converged with the main flue gas; s6, the hot flue gas is conveyed to a drying machine through an induced draft fan to be dried; and S7, the flue gas obtained after heat exchange is sent to a suction inlet of an induced draft fan, mixed in the induced draft fan and then discharged to the atmosphere. The waste heat and the heat value of the pyrolysis gas are utilized, the generating capacity of the incineration system is effectively improved while the garden waste is recycled, and the construction cost and the operation cost of the garden waste recycling system can be reduced by utilizing hardware of the incinerator and the flue gas purification system.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of garden waste resource processing, in particular to a garden waste resource processing coupled with garbage incineration operation process. BACKGROUND

[0002] At present, with the rapid development of urban greening, the total amount of garden greening waste in domestic major cities is also increasing year by year. In domestic Beijing, Shanghai, Guangzhou, Shenzhen and other cities, garden greening waste has gradually been separated from municipal waste and handled by the garden greening department for centralized disposal, and gradually processed in more and more ways, and then recycled to form a new organic resource.

[0003] In the related art, there are mainly three processing methods: composting, making biomass fuel and making organic mulch.

[0004] 1. Composting: This is the most environmentally friendly method. Garden waste is converted into organic fertilizer through composting and fermentation, which can be used to improve soil fertility and promote plant growth, reducing the amount of waste and creating useful resources. 2. Making biomass fuel: Garden waste is processed and compressed to make biomass pellets or other fuels. This fuel can replace traditional fuels such as coal for power generation or heating, reducing dependence on fossil fuels and reducing greenhouse gas emissions. 3. Making organic mulch: Garden waste such as leaves, branches and grass clippings is crushed to make organic mulch. These mulches can be applied to garden green spaces, farmland and flower beds.

[0005] However, the above processing methods have low synergy, cannot achieve efficient coupling effect, and increase the construction cost and operation cost of the garden waste resource system; therefore, it is urgent to provide a garden waste resource processing coupled with garbage incineration method to solve the above problems. SUMMARY

[0006] The purpose of the present application is to provide a garden waste resource processing coupled with garbage incineration operation process to solve the problem of low synergy of the processing method in the related art, which cannot achieve efficient coupling effect and increases the construction cost and operation cost of the garden waste resource system.

[0007] The garden waste resource processing coupled with garbage incineration operation process provided by the present application adopts the following technical solution: A garden waste resource processing coupled with garbage incineration operation process, comprising the following steps: S1, garden waste is separated into high-quality garden waste and low-quality garden waste by a sorting and pretreatment device; S2, the high-quality garden waste obtained above is sequentially fed into a dryer, a pyrolysis machine and a condenser to produce three economic products of pyrolysis carbon, wood vinegar and non-condensed gas in the order of solid, liquid and gas; the non-condensed gas produced after the condenser has a high calorific value and is fed into a flue of a waste incinerator to burn and work; S3, the low-quality garden waste obtained in step S1 is dried by a dryer to have a water content of less than 15%, and the dried low-quality garden waste is granulated by a granulator; S4, the household waste and the non-condensed gas obtained in step S2 are fed into a waste incinerator to be incinerated to produce high-temperature flue gas; S5, the hot flue gas of the incinerator is fed into a second flue, and part of the flue gas is fed into the pyrolysis machine as a pyrolysis heat source and then fed into a third flue to mix with the main flue gas; S6, the hot flue gas is fed into the dryers of the high-calorific-value and low-calorific-value garden waste by an induced draft fan to provide energy and dry the garden waste; S7, the flue gas after heat exchange is fed into the suction inlet of the induced draft fan, mixed again in the induced draft fan, and then discharged into the atmosphere through a chimney.

[0008] Further, in steps S1 and S4, the ratio of the garden waste to the household waste should be less than 25%.

[0009] Further, in step S1, the high-quality garden waste should satisfy the conditions of impurity content < 5% and lignin content ≥ 25%, and the low-quality garden waste should satisfy the conditions of impurity content > 5% and lignin content < 25%.

[0010] Further, in steps S2 and S5, the temperature of the hot flue gas fed into the pyrolysis machine is 750-850℃, and the flue gas fed into the pyrolysis machine accounts for 5-10% of the total hot flue gas.

[0011] Further, in step S5, to avoid high-temperature corrosion, a sleeve is arranged on the pyrolysis machine in addition to using 310S stainless steel on the flue gas heat exchange side of the pyrolysis machine, and the sleeve needs to be chrome-plated.

[0012] Further, in step S4, the non-condensed gas is incinerated at the auxiliary burner position of the first flue by a burner.

[0013] Further, in steps S2 and S6, the temperature of the flue gas is 150℃, the flue gas amount fed into the dryer accounts for 10-15% of the total flue gas amount, and the drying time is within 1-1.5 hours.

[0014] Further, in step S6, to avoid low-temperature corrosion, a sleeve is arranged on the dryer in addition to using 316 stainless steel on the flue gas heat exchange side of the dryer, and a layer of fluoride coating is sprayed on the outside of the sleeve.

[0015] Compared with the prior art, the application has the beneficial effects that: The scheme of the application provides a running process of garden waste resourceization coupled with household waste incineration, which has high coordination degree and can achieve high coupling effect, and makes full use of the waste heat of the waste incinerator and the pyrolysis gas heat value of the garden waste pyrolysis, so that the garden waste resourceization can be realized, the power generation capacity of the waste incineration system can be effectively improved, and the hardware of the incinerator and the flue gas purification system can be fully utilized, thereby reducing the construction cost and operation cost of the garden waste resourceization system.

[0016] In addition, the energy utilization efficiency of the scheme of the application is high. According to energy balance calculation, the energy of the pyrolysis gas generated by the garden waste pyrolysis is 300% of the energy required by the hot flue gas, and 60% of the energy in the pyrolysis gas can be used to increase the steam evaporation capacity. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the running process of garden waste resourceization coupled with waste incineration according to an embodiment of the application.

[0018] Figure 2 is a process flow diagram of Figure 1 DETAILED DESCRIPTION

[0019] The following will be described in detail with reference to the accompanying drawings. Figures 1-2 The application will be further described in detail.

[0020] The embodiment of the application discloses a running process of garden waste resourceization coupled with waste incineration, referring to Figure 1 and Figure 2 In the embodiment, the running process comprises the following steps: S1, garden waste is divided into high-quality garden waste and low-quality garden waste through sorting and pretreatment equipment; specifically, the quality of the garden waste is divided according to the content of combustible components in the garden waste.

[0021] Meanwhile, in step S1, the high-quality garden waste should meet the requirements of impurity content <5% and lignin content ≥25%, such as branches and trunks; the low-quality garden waste should meet the requirements of impurity content >5% and lignin content <25%, such as leaves and weeds.

[0022] S2, the high-quality garden waste obtained above enters a dryer, a pyrolysis machine and a condenser in sequence, and three economic products of solid, liquid and gas, i.e. pyrolysis carbon, wood vinegar and non-condensable gas, are generated in sequence. Specifically, the pyrolysis carbon generated by the pyrolysis machine can be used to make carbon-based fertilizer and activated carbon, and mechanism carbon can also be generated by a carbon production machine.

[0023] ​And the output of wood vinegar deep processing can be called water-soluble fertilizer base, or directly used in agriculture, or industry; the non-condensable gas generated by the condenser has a high calorific value, and the non-condensable gas is discharged into a flue of a waste incinerator for incineration to do work.

[0024] S3, the low-quality garden waste obtained in step S1 is dried by a dryer, and the water content is less than 15%, so that the water content requirement of granulation in the granulator is reached, and therefore the dried low-quality garden waste is granulated by the granulator.

[0025] S4, the household garbage and the non-condensable gas obtained in step S2 are put into the waste incinerator for incineration to generate high-temperature flue gas. Specifically, in steps S1 and S4, the ratio of the garden waste and the household garbage treatment capacity should be less than 25%; this is because the process of the present application requires that the household garbage incinerator must provide enough energy for the garden waste resource process; but when the household garbage treatment capacity is four times that of the garden waste, the energy balance requirement can be met. At the same time, in step S4, the non-condensable gas is incinerated by the burner at the flue auxiliary burner position.

[0026] S5, the hot flue gas of the incinerator enters the second flue, part of the flue gas is divided into the pyrolysis machine as a pyrolysis heat source, and then enters the third flue to meet the main flue gas. Specifically, in steps S2 and S5, the temperature of the hot flue gas entering the pyrolysis machine is 750-850℃, and the flue gas entering the pyrolysis machine accounts for 5-10% of the total hot flue gas amount. By setting the above process conditions, the energy requirement for garden waste pyrolysis can be met.

[0027] At the same time, in step S5, in order to avoid high-temperature corrosion, the pyrolysis machine and its flue gas heat exchange side need to be plated with chromium in addition to using 310S stainless steel. Specifically, the sleeve is a heat exchange sleeve installed on the pyrolysis machine; and the pyrolysis machine is a partition type pyrolysis machine.

[0028] S6, the hot flue gas is transported to the high and low calorific value garden waste dryers by the induced draft fan to provide energy and dry. Specifically, in steps S2 and S6, the flue gas temperature is 150℃, the flue gas amount entering the dryer accounts for 10-15% of the total flue gas amount, and the drying time is within 1-1.5 hours, which can avoid the situation that the drying material entering the pyrolysis machine has too low water content or low-temperature pyrolysis occurs in the dryer.

[0029] At the same time, in step S6, in order to avoid low-temperature corrosion, the dryer and its flue gas heat exchange side need to be sprayed with a layer of fluoride coating in addition to using 316 stainless steel. Specifically, the sleeve is a heat exchange sleeve installed on the dryer. Specifically, before the hot flue gas is transported to the high and low calorific value garden waste dryers by the induced draft fan, the hot flue gas is purified by a flue gas purification system.

[0030] S7: the flue gas after heat exchange is sent to the suction port of the induced draft fan, mixed in the induced draft fan again, and then discharged into the atmosphere through the chimney.

[0031] Therefore, the scheme of the present application provides a process of coupling garden waste resourceization with household waste incineration. First, the garden waste is classified into high and low quality, and then the garden waste resourceization is carried out by the energy of the flue gas of the incinerator. The non-condensable gas generated by the pyrolysis of the garden waste can also enter the incinerator for incineration, increasing the steam evaporation capacity of the waste incinerator. The scheme of the present application has high synergy and can achieve efficient coupling effect, while making full use of the waste heat of the waste incinerator and the heat value of the pyrolysis gas of the garden waste pyrolysis. At the same time of garden waste resourceization, the power generation capacity of the waste incineration system is effectively improved, and the hardware of the incinerator and the flue gas purification system is fully utilized, thereby reducing the construction cost and operation cost of the garden waste resourceization system.

[0032] In addition, the energy utilization efficiency of the scheme of the present application is high. According to energy balance calculation, the energy of the pyrolysis gas generated by the garden waste pyrolysis is 300% of the heat energy required by the pyrolysis gas, and 60% of the energy in the pyrolysis gas can be used to increase the steam evaporation capacity. At the same time, according to the calculation, about 5% of the steam evaporation capacity can be increased. The flue gas used by the dryer belongs to the flue gas purification system, which is pure waste heat recovery and does not affect the evaporation capacity of the waste heat boiler.

[0033] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process conversion, or direct or indirect application in other related technical fields, as described in the specification and drawings of the present application, are also included in the patent protection scope of the present application.

Claims

1. A garden waste resource utilization coupled with waste incineration operation process, characterized in that, It comprises the following steps: S1, garden waste is separated into high-quality garden waste and low-quality garden waste through sorting and pretreatment equipment; S2, the high-quality garden waste obtained above is sequentially introduced into a dryer, a pyrolysis machine and a condenser to produce pyrolysis carbon, wood vinegar and non-condensable gas, which are three economic products of solid, liquid and gas; the non-condensable gas produced after the condenser has a high calorific value and is introduced into a flue of a waste incinerator to burn and work; S3, the low-quality garden waste obtained in step S1 is dried by a dryer to have a water content of less than 15%, and the dried low-quality garden waste is granulated by a granulator; S4, household waste and the non-condensable gas obtained in step S2 are introduced into the waste incinerator to be incinerated to produce high-temperature flue gas; S5, the hot flue gas of the incinerator is introduced into a second flue, and part of the flue gas is introduced into the pyrolysis machine as a pyrolysis heat source and then introduced into a third flue to mix with the main flue gas; S6, the hot flue gas is introduced into dryers of high- and low-calorific value garden waste through an induced draft fan to provide energy and dry the garden waste; S7, the flue gas after heat exchange is introduced into the suction port of the induced draft fan, mixed again in the induced draft fan, and then discharged into the atmosphere through a chimney.

2. The operation process of garden waste resourceization coupled with waste incineration according to claim 1, characterized in that, In steps S1 and S4, the ratio of the treatment amount of garden waste to that of household waste should be less than 25%.

3. The operation process of garden waste resourceization coupled with waste incineration according to claim 1, characterized in that, In step S1, the high-quality garden waste should have an impurity content of less than 5% and a lignin content of more than 25%, and the low-quality garden waste should have an impurity content of more than 5% and a lignin content of less than 25%.

4. The operation process of garden waste resourceization coupled with waste incineration according to claim 1, characterized in that, In steps S2 and S5, the temperature of the hot flue gas introduced into the pyrolysis machine is 750-850℃, and the amount of the flue gas introduced into the pyrolysis machine accounts for 5-10% of the total amount of hot flue gas.

5. The operation process of garden waste resourceization coupled with waste incineration according to claim 4, characterized in that, In step S5, to avoid high-temperature corrosion, a sleeve is arranged on the pyrolysis machine in addition to using 310S stainless steel on the flue gas heat exchange side, and the sleeve needs to be chrome plated.

6. The operation process of garden waste resourceization coupled with waste incineration according to claim 1, characterized in that, In step S4, the non-condensable gas is incinerated at the auxiliary burner position of the first flue by a burner.

7. The operation process of garden waste resourceization coupled with waste incineration according to claim 1, characterized in that, In steps S2 and S6, the temperature of the flue gas is 150℃, the amount of the flue gas introduced into the dryer accounts for 10-15% of the total amount of flue gas, and the drying time is within 1-1.5 hours.

8. The operation process of garden waste resourceization coupled with waste incineration according to claim 7, characterized in that, In step S6, to avoid low-temperature corrosion, a sleeve is arranged on the dryer in addition to using 316 stainless steel on the flue gas heat exchange side, and a layer of fluoride coating is sprayed on the outside of the sleeve.

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