CN-122006568-A - Biomass blending control method and system

CN122006568ACN 122006568 ACN122006568 ACN 122006568ACN-122006568-A

Abstract

The invention provides a biomass blending control method and a biomass blending control system, which relate to the technical field of resource recycling and comprise a dehydration unit, a crushing unit, a mixing unit, a granulating unit and a conveying unit which are electrically connected with a control unit, wherein the dehydration unit, the crushing unit, the mixing unit and the granulating unit are sequentially connected through the conveying unit, the dehydration unit dehydrates raw sludge to obtain dehydrated sludge, the crushing unit crushes and pulverizes the dehydrated sludge and biomass to obtain sludge powder and biomass powder, the mixing unit mixes the dehydrated sludge and biomass powder according to a blending proportion to obtain mixed powder, the granulating unit extrudes the mixed powder into fuel particles, and the conveying unit conveys materials. The biomass has a heat value higher than that of the sludge, and the dehydrated sludge and the biomass are crushed, crushed and mixed in sequence, so that the heat value of the fuel is improved, the heat value of the mixed fuel reaches the requirement of self-sustaining combustion, and the problem that the heat value of the sludge is low and cannot be self-sustaining combusted is solved.

Inventors

CHEN XIAO
TAO QIANG
DENG BOHAO
DENG XUE
WU MENGLI

Assignees

四川华洁环保股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260302

Claims (9)

1. The biomass blending control system is characterized by comprising a control unit (6), and a dewatering unit (1), a crushing unit (2), a mixing unit (3), a granulating unit (4) and a conveying unit (5) which are electrically connected with the control unit (6), wherein the control unit (6) is used for controlling the starting and stopping of the dewatering unit (1), the crushing unit (2), the mixing unit (3) and the granulating unit (4); the dehydration unit (1), the crushing unit (2), the mixing unit (3) and the granulating unit (4) are sequentially connected through the conveying unit (5); The dewatering unit (1) is used for dewatering the raw sludge to obtain dewatered sludge with the water content of less than or equal to 50%; the crushing unit (2) is used for crushing and crushing the dehydrated sludge and biomass to obtain sludge powder and biomass powder with particle sizes smaller than or equal to 1 mm; The mixing unit (3) is used for mixing the sludge powder and the biomass powder according to the mixing proportion to obtain mixed powder; the granulating unit (4) is used for extruding the mixed powder into regular fuel particles; The conveying unit (5) is used for conveying materials, wherein the materials comprise any one of raw sludge, biomass, dehydrated sludge, sludge powder, biomass powder and mixed powder.
2. The control system according to claim 1, characterized in that the dewatering unit (1) comprises a filter press provided with a pressure relief valve, a level sensor and a pressure transmitter, which are electrically connected to the control unit (6); the liquid level sensor is used for detecting the sludge quantity entering the filter press, and the pressure transmitter is used for detecting the filter pressing pressure; The control unit (6) is configured to perform the following operations: Judging whether the sludge amount is equal to a preset sludge amount or not; if the sludge quantity is equal to the preset sludge quantity, starting a filter press, and judging whether the filter pressing pressure is in a normal pressure interval after the filter press is started; If the filter pressing pressure is higher than the normal pressure interval, opening a pressure relief valve; if the filter pressing pressure is lower than the normal pressure interval, generating a pressure shortage alarm signal; if the sludge amount is smaller than the preset sludge amount, continuing to feed the filter press; And if the sludge amount is larger than the preset sludge amount, generating a sludge feeding abnormal signal.
3. The control system according to claim 1, characterized in that the crushing unit (2) comprises a crusher group comprising at least two crushers and a crusher group comprising at least two crushers; The conveying unit (5) comprises a first conveying mechanism, a second conveying mechanism and a third conveying mechanism, wherein the discharge end of the first conveying mechanism is connected with the feed end of the crusher unit, the second conveying mechanism is connected with the crusher unit and the crusher unit, and the feed end of the third conveying mechanism is connected with the discharge end of the crusher unit; The crusher unit is used for crushing the dewatered sludge and biomass; The pulverizer set is used for pulverizing the dehydrated sludge and biomass; The discharging end of each crusher in the crusher set is provided with a first granularity detector, and the first granularity detector is electrically connected with a control unit (6); the first granularity detector is used for detecting the particle size of the crushed material; The control unit (6) is used for judging whether the particle size of the crushed material is in a normal crushing particle size range or not, and adjusting the working frequency of the corresponding crusher when the particle size of the crushed material is not in the normal crushing particle size range; the pulverizer is provided with a first rotational speed detector which is electrically connected with a control unit (6); the first rotation speed detector is used for monitoring the rotation speed of the pulverizer; the control unit (6) is used for judging whether the rotating speed of the pulverizer is in a normal rotating speed interval or not, and adjusting the working frequency of the corresponding pulverizer when the rotating speed of the pulverizer is not in the normal rotating speed interval; The discharge end of each pulverizer in the pulverizer set is provided with a second granularity detector, and the second granularity detector is electrically connected with the control unit (6); the second granularity detector is used for detecting the particle size of the crushed material; The control unit (6) is used for judging whether the particle size of the crushed material is in a normal crushing particle size range, and generating a shortage crushing alarm signal when the particle size of the crushed material is not in the normal crushing particle size range.
4. A control system according to claim 3, characterized in that the mixing unit (3) comprises a screw scale group and a mixer, which are electrically connected to a control unit (6); The feeding end of the spiral metering balance group is connected with the discharging end of the third conveying mechanism; The spiral metering balance group comprises a first spiral metering balance and a second spiral metering balance, and discharge ends of the first spiral metering balance and the second spiral metering balance are respectively connected with a sludge feed inlet and a biomass feed inlet of the mixer; The first spiral metering scale is used for conveying and monitoring the flow of the sludge powder; The second spiral metering scale is used for conveying and monitoring the flow rate of the biomass powder.
5. The control system according to claim 1, characterized in that the feed end of the dewatering unit (1) is connected with a feed pump, the feed end of the feed pump is provided with an electromagnetic flow meter, and the feed pump and the electromagnetic flow meter are electrically connected with the control unit (6); The electromagnetic flowmeter is used for monitoring the material feeding rate; The control unit (6) is used for judging whether the material feeding rate is in a normal feeding rate interval; if the material feeding rate is higher than the normal feeding rate interval, adjusting the working frequency of the feeding pump; and if the material feeding rate is lower than the normal feeding rate interval, generating a feeding alarm signal.
6. A control system according to claim 3, characterized in that the discharge end of the filter press is provided with a first moisture content detector, which is electrically connected to the control unit (6); the first water content detector is used for detecting the water content of the dehydrated sludge; the control unit (6) is used for judging whether the water content of the dehydrated sludge is in a normal water content interval; And when the water content of the dewatered sludge is not in the normal water content interval, adjusting the filter pressing time.
7. The control system according to claim 6, characterized in that the discharge end of the pulverizer is provided with a second moisture content detector, which is electrically connected to the control unit (6); The second water content detector is used for detecting the water content of the sludge powder or the biomass powder; the control unit (6) is used for judging whether the water content of the sludge powder is in a normal water content interval of the sludge powder and judging whether the water content of the biomass powder is in a normal water content interval of the biomass powder; When the water content of the sludge powder is higher than the water content interval of the normal sludge powder, stopping conveying the sludge powder to the mixing unit (3); When the water content of the sludge powder is lower than the water content interval of the normal sludge powder, increasing the feeding amount of the sludge powder conveyed to the mixing unit (3); And stopping conveying the biomass powder to the mixing unit (3) when the water content of the biomass powder is higher than the water content interval of the normal biomass powder.
8. The control system according to claim 4, characterized in that the mixer is provided with a third moisture content detector, which is electrically connected to the control unit (6); after mixing for a preset time, the third water content detector detects the actual water content of the mixed powder; the control unit (6) is used for judging whether the actual water content of the mixed powder is in a normal mixed water content interval; When the actual water content of the mixed powder is higher than the normal mixed water content interval, increasing the feeding amount of the biomass powder conveyed to the mixer; when the actual water content of the mixed powder is lower than the normal mixed water content interval, increasing the feeding amount of the sludge powder conveyed to the mixer; sampling and detecting the actual heat value of the mixed powder when the actual water content of the mixed powder is in a normal mixed water content range; when the actual heat value of the mixed powder is smaller than the preset heat value, the biomass powder feeding amount conveyed to the mixer is increased in the next batch until the preset heat value is reached.
9. A biomass blending control method, characterized in that the control method is implemented by the control system according to any one of claims 1 to 8; Setting the preset water content of the mixed powder; acquiring the water content of the sludge powder and the water content of the biomass powder; and determining the blending proportion based on the water content of the sludge powder, the water content of the biomass powder and the preset water content of the mixed powder.

Description

Biomass blending control method and system Technical Field The invention relates to the technical field of resource recycling, in particular to a biomass blending control method and system. Background In order to realize the recycling of sludge and agricultural and forestry waste, the sludge and the agricultural and forestry waste are expected to be cooperatively prepared into biomass fuel. However, the inherent characteristics of the primary sludge severely restrict the industrial application of the technology, namely, the water content of the primary sludge is generally 75-85%, the water content is excessively high, the self heat value of the sludge is extremely low, generally only 0-600kcal/kg and is far lower than the minimum heat value threshold (more than or equal to 800 kcal/kg) required by self-sustaining combustion, so that the sludge cannot be independently used as fuel to participate in the combustion reaction, the assistance of external energy sources is needed, and the essential problem of energy self-supply capability loss exists. Because the sludge cannot be burned in a self-sustaining manner, a large amount of outsourcing energy sources (such as coal, natural gas, high-heat-value biomass fuel and the like) are required to be added in the existing treatment process to dry or support the sludge, so that the fuel purchasing cost is increased, and on the other hand, extra carbon emission and pollutants are generated in the burning process of the outsourcing energy sources, which is contrary to the aim of recycling the low-carbon environment-friendly sludge, and meanwhile, the treatment measures of leakage prevention, volume reduction and the like are required to be added in the transportation and storage processes of the high-water-content sludge, so that the comprehensive treatment cost is further increased. The characteristics of high water content and low heat value limit the recycling path of the sludge. If the waste gas is directly burnt and disposed, the input quantity of auxiliary energy needs to be continuously regulated and controlled to maintain the burning temperature, so that the problems of insufficient burning, hearth temperature fluctuation and the like are easy to occur, and the tail gas treatment effect and the ash recycling value are affected. Disclosure of Invention The invention aims to provide a biomass blending control method and a biomass blending control system, which aim to solve the technical problems that sludge has high water content and low heat value, so that self-sustaining combustion cannot be realized. The invention is realized by the following technical scheme: The first aspect provides a biomass blending control system, which comprises a control unit, and a dewatering unit, a crushing unit, a mixing unit, a granulating unit and a conveying unit which are electrically connected with the control unit, wherein the control unit is used for controlling the start and stop of the dewatering unit, the crushing unit, the mixing unit and the granulating unit; The dehydration unit, the crushing unit, the mixing unit and the granulating unit are sequentially connected through the conveying unit; The dehydration unit is used for dehydrating the primary sludge to obtain dehydrated sludge with the water content of less than or equal to 50%; the crushing unit is used for crushing and crushing the dehydrated sludge and biomass to obtain sludge powder and biomass powder with the particle size smaller than or equal to 1 mm; the mixing unit is used for mixing the sludge powder and the biomass powder according to the mixing proportion to obtain mixed powder; The granulating unit is used for extruding the mixed powder into regular fuel particles; The conveying unit is used for conveying materials, wherein the materials comprise any one of raw sludge, biomass, dehydrated sludge, sludge powder, biomass powder and mixed powder. The crushing unit respectively crushes and crushes the dewatered sludge and biomass, and the biomass has a higher heat value than the sludge, the sludge powder and the biomass powder are mixed by the mixing unit, so that the heat value is further improved, the mixed fuel heat value reaches or exceeds the minimum heat value threshold required by self-sustaining combustion based on the mixing proportion, and the problem that the sludge cannot be self-sustaining combusted due to low heat value is solved. And finally extruding the mixture into fuel particles for convenient transportation and storage. Further, the dehydration unit comprises a filter press, the filter press is provided with a pressure relief valve, a liquid level sensor and a pressure transmitter, and the pressure relief valve, the liquid level sensor and the pressure transmitter are electrically connected with the control unit; The liquid level sensor is used for detecting the sludge amount entering the filter press, and the pressure transmitter is used for detecting the filter pressing pressure; the