CN116986785A - Wet sludge drying control system and method - Google Patents
Wet sludge drying control system and method Download PDFInfo
- Publication number
- CN116986785A CN116986785A CN202211613705.1A CN202211613705A CN116986785A CN 116986785 A CN116986785 A CN 116986785A CN 202211613705 A CN202211613705 A CN 202211613705A CN 116986785 A CN116986785 A CN 116986785A
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- Prior art keywords
- sludge
- conduction oil
- heat conduction
- dryer
- wet
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- 239000010802 sludge Substances 0.000 title claims abstract description 168
- 238000001035 drying Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 26
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000003546 flue gas Substances 0.000 claims abstract description 34
- 238000002485 combustion reaction Methods 0.000 claims abstract description 33
- 238000002309 gasification Methods 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 238000010981 drying operation Methods 0.000 claims description 7
- 239000010865 sewage Substances 0.000 description 7
- 238000007599 discharging Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 241000700605 Viruses Species 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000018102 proteins Nutrition 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
Abstract
The invention provides a wet sludge drying control system and a method thereof, comprising the following steps: the conduction oil circulation system is used for heating the conduction oil through the flue gas exhausted by the gasification combustion furnace boiler; the sludge dryer is used for receiving the heat conduction oil in the heat conduction oil circulation system so as to heat the sludge dryer; the wet sludge feeding device is used for conveying wet sludge into the sludge dryer. According to the invention, the temperature of the flue gas discharged by the flue gas discharge pipeline of the gasification combustion furnace boiler is used as a starting signal of the drying control system, so that the heat-conducting oil circulation system heats the sludge dryer, and the wet sludge is dried by using the temperature of the heat-conducting oil. And re-feeding the dried sludge into a gasification combustion boiler for incineration. In the process, the high-temperature flue gas exhausted by the flue gas exhaust pipeline of the gasification combustion furnace boiler can be recycled, and meanwhile, wet sludge is dried by the sludge dryer, so that energy is recycled, and meanwhile, the cost can be reduced.
Description
Technical Field
The invention relates to the technical field of wet sludge drying control, in particular to a wet sludge drying control system and method.
Background
The sludge is produced in the sewage treatment process, and is an uneven body composed of organic residues, bacterial bodies, inorganic particles, colloid and the like, while the sewage is formed by mixing resident domestic sewage, municipal sewage, industrial sewage, groundwater, surface water and rainwater, the sewage contains organic matters, inorganic matters, toxic organic matters and virus microorganisms, and the organic components in the sewage are mainly proteins, carbohydrates, fatty acids and waste oil.
Municipal sludge generally has higher water content, when municipal sludge is incinerated, a large amount of heat energy is consumed to dry the wet sludge, so that the wet sludge can be incinerated when the water content is lower than a certain value, meanwhile, a gasification combustion furnace boiler is generally adopted to treat municipal sludge at present, a large amount of high-temperature flue gas is generated for emission in the furnace in the process, and the high-temperature flue gas contains a large amount of heat energy to cause loss and cannot be well utilized.
Disclosure of Invention
The invention provides a wet sludge drying control system and a method thereof, which aim to overcome the technical problems.
In order to achieve the above object, the technical scheme of the present invention is as follows:
a wet sludge drying control system comprises a heat conducting oil circulating system, a sludge dryer, a wet sludge feeding device, a steam condensing system and a water circulating system;
the heat conduction oil circulation system is used for heating the heat conduction oil in the heat conduction oil circulation system through the flue gas exhausted by the gasification combustion furnace boiler;
the sludge dryer is used for receiving the heat conduction oil in the heat conduction oil circulation system, and the temperature of the heat conduction oil is used for heating the sludge dryer;
the wet sludge feeding device is used for conveying wet sludge into the sludge dryer so as to dry the wet sludge through the sludge dryer after temperature rise;
the steam condensing system is used for condensing steam generated in the drying operation process of wet sludge; so as to convert the water vapor generated in the drying operation process of the wet sludge in the sludge dryer into condensed water;
the water circulation system is used for collecting the condensed water.
Further, the conduction oil circulation system comprises a conduction oil heat exchanger, a first circulation pipeline and a second circulation pipeline;
the heat transfer oil heat exchanger is connected with a flue gas discharge pipeline of the gasification combustion furnace boiler so as to heat the heat transfer oil in the heat transfer oil circulation system through the flue gas discharged by the gasification combustion furnace boiler;
an oil outlet of the heat conduction oil heat exchanger is connected with the sludge dryer through a first circulating pipeline; and an oil inlet of the heat conduction oil heat exchanger is connected with the sludge dryer through a second circulating pipeline.
Further, a heat conduction oil circulating pump is arranged on the first circulating pipeline.
Further, the sludge dryer is connected with the gasification combustion furnace boiler through a sludge bin.
Further, an expansion oil tank is arranged on the second circulation pipeline.
A control method of a wet sludge drying control system comprises the following steps:
s1: when the temperature of the flue gas exhausted by the flue gas exhaust pipeline of the gasification combustion furnace boiler enables the inlet temperature of the heat conduction oil heat exchanger to reach a first temperature threshold value, a heat conduction oil circulation system is started, and heat conduction oil circulates between the heat conduction oil heat exchanger and the sludge dryer;
s2: when the temperature of the heat conduction oil in the heat conduction oil circulation system is increased to a second temperature threshold value, the sludge dryer starts to operate at a first dryer operating frequency;
s3: when the temperature of the heat conduction oil in the heat conduction oil circulation system is increased to a third temperature threshold value, starting the wet sludge feeding device; wet sludge is supplied to a sludge dryer, and the wet sludge is dried while a water circulation system and a steam condensing system are started;
s4: and drying the wet sludge to obtain dried sludge with the water content of 20-30%, enabling the dried sludge to enter a dry storage bin, and waiting to enter a gasification combustion furnace boiler for incineration through a dry sludge feeding auger.
Further, after the conduction oil circulation system is started, a conduction oil circulation pump arranged on the first circulation pipeline is started at the first water pump operation frequency, so that the conduction oil circulates between the conduction oil heat exchanger and the sludge dryer.
Further, the wet sludge feed device supplies wet sludge having a water content of more than 80% to the sludge dryer.
The beneficial effects are that: the invention provides a wet sludge drying control system and a method, wherein when the inlet temperature of a heat transfer oil heat exchanger reaches a first temperature threshold value through smoke exhausted by a smoke exhaust pipeline of a gasification combustion furnace boiler, the smoke is used as a starting signal of a drying control system, so that a heat transfer oil circulation system heats a sludge dryer, and wet sludge is dried by using the temperature of heat transfer oil. And re-feeding the dried sludge into a gasification combustion boiler for incineration. In the process, the high-temperature flue gas exhausted by the flue gas exhaust pipeline of the gasification combustion furnace boiler can be recycled, and meanwhile, wet sludge is dried by the sludge dryer, so that energy is recycled, and meanwhile, the cost can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a flow chart of a wet sludge drying control method of the present invention;
fig. 2 is a schematic diagram of a wet sludge drying control system according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment provides a wet sludge drying control system, which is shown in fig. 2 and comprises a heat conducting oil circulating system 1, a heat conducting oil circulating pump 2, a sludge dryer 3, a wet sludge feeding device 4, a steam condensing system 5 and a water circulating system 6;
the heat conduction oil circulation system 1 is used for heating the heat conduction oil in the heat conduction oil circulation system 1 through the flue gas exhausted by the gasification combustion furnace boiler; specifically, the conduction oil circulation system 1 is connected with a flue gas discharge pipeline 9 of the gasification combustion furnace boiler, so that the conduction oil circulation system 1 exchanges heat with high-temperature flue gas discharged by the flue gas discharge pipeline of the gasification combustion furnace boiler;
the sludge dryer 3 is used for receiving the heat conduction oil in the heat conduction oil circulation system 1, and the temperature of the heat conduction oil is used for heating the sludge dryer 3; specifically, the sludge dryer 3 is connected with the conduction oil circulation system 1 to realize heat exchange between the conduction oil circulation system 1 and the sludge dryer 3;
the wet sludge feeding device 4 is used for conveying wet sludge into the sludge dryer 3 so as to dry the wet sludge through the sludge dryer after temperature rise; specifically, the wet sludge feeding device 4 is connected with the sludge dryer 3, so that the wet sludge in the wet sludge feeding device 4 enters the sludge dryer 3;
the steam condensing system 5 is used for condensing steam generated in the drying operation process of the wet sludge; specifically, the sludge dryer 3 is connected with the steam condensing system 5 to convert the water vapor generated in the drying operation process of the wet sludge in the sludge dryer 3 into condensed water;
the water circulation system 6 is used for collecting the condensed water. Specifically, the steam condensing system 5 is connected to the water circulating system 6 to collect condensed water to enter the water tank through the water circulating system 6.
Preferably, the conduction oil circulation system 1 includes a conduction oil heat exchanger 18, a first circulation line 11 and a second circulation line 12;
the heat conduction oil heat exchanger 18 is connected with a flue gas discharge pipeline 9 of the gasification combustion furnace boiler so as to heat the heat conduction oil in the heat conduction oil circulation system 1 through the flue gas discharged by the gasification combustion furnace boiler;
an oil outlet of the heat conduction oil heat exchanger 18 is connected with the sludge dryer 3 through a first circulating pipeline 11; an oil inlet of the heat conduction oil heat exchanger 18 is connected with the sludge dryer 3 through a second circulation pipeline 12;
preferably, the second circulation pipeline 12 is provided with an expansion oil tank 7;
preferably, the first circulation pipeline 11 is provided with a conduction oil circulation pump 2;
the sludge dryer 3 is connected with a gasification combustion furnace boiler (not labeled in the figure) through a sludge bin, so that the dried sludge subjected to the drying operation enters the gas combustion furnace boiler to be burnt.
The invention also discloses a control method of the wet sludge drying control system, as shown in figure 1; the method comprises the following steps:
s1: when the temperature of the flue gas exhausted by the flue gas exhaust pipeline of the gasification combustion furnace boiler enables the inlet temperature of the heat conduction oil heat exchanger to reach a first temperature threshold value, a heat conduction oil circulation system is started, and heat conduction oil circulates between the heat conduction oil heat exchanger and the sludge dryer;
preferably, after the conduction oil circulation system is started, a conduction oil circulation pump arranged on the first circulation pipeline is started at the first water pump operation frequency, so that the conduction oil circulates between the conduction oil heat exchanger and the sludge dryer;
s2: when the temperature of the heat conduction oil in the heat conduction oil circulation system is increased to a second temperature threshold value, the sludge dryer starts to operate at a first dryer operating frequency;
s3: when the temperature of the heat conduction oil in the heat conduction oil circulation system is increased to a third temperature threshold (130 ℃), starting the wet sludge feeding device; wet sludge is supplied to a sludge dryer, and the wet sludge is dried while a water circulation system and a steam condensing system are started;
preferably, the wet sludge feed device supplies wet sludge having a water content of more than 80% to the sludge dryer.
S4: and drying the wet sludge to obtain dried sludge with the water content of 20-30%, enabling the dried sludge to enter a dry storage bin, and waiting until the dried sludge enters a gasification combustion furnace boiler for incineration through a dry sludge feeding auger.
Specifically, the first circulation pipeline is a pipeline for conveying heat conduction oil from the heat conduction oil heat exchanger to the sludge dryer, when the inlet temperature of the heat conduction oil heat exchanger reaches 50 ℃, the control system controls the heat conduction oil heat exchange system to start, so that the heat conduction oil circulation pump on the first circulation pipeline is started at a low frequency of 20Hz, and the heat conduction oil circulates between the heat conduction oil heat exchanger and the sludge dryer;
with the increase of the flue gas temperature of the heat conducting oil inlet, the heat conducting oil is heated at 40 ℃ per hour, and because the viscosity of the oil is high during cooling of the furnace, the flow velocity in a heating surface tube is low, the oil film on the tube wall is thick, the heat transfer condition is poor, for example, the heating speed is too high, and the local oil film temperature is easy to be too high.
When the temperature of the heat conduction oil in the heat conduction oil circulation system is increased to 80 ℃, the sludge dryer starts to run at a low frequency, and the sludge dryer is preheated so that the dryer roller is heated uniformly.
When the temperature of the heat conduction oil in the heat conduction oil circulation system is increased to 130 ℃, a wet sludge feeding pump of the wet sludge feeding device is started; wet sludge with the water content of 80% is supplied to a sludge dryer at low frequency, the wet sludge is dried, and a water circulation system and a steam condensing system are started at the same time; at this time, the water circulation system condenses the steam generated from the dryer by the steam condensing system. The output of the heat conducting oil circulating pump is increased along with the increment of the oil temperature, and when the heat conducting oil is lifted by 60 ℃, the frequency interval is lifted by 10Hz.
Specifically, when the temperature of the flue gas exhausted by the flue gas exhaust pipeline of the gasification combustion furnace boiler increases the inlet temperature of the heat transfer oil heat exchanger to a fourth temperature threshold (1100 ℃), and when the temperature of the heat transfer oil reaches a fifth temperature threshold (230 ℃), the heat transfer oil circulating pump reaches the maximum output, at this time, the dryer can continuously and stably process wet sludge, and a single dry dryer daily processes wet sludge: 20 tons/day, dry duration at a time: 2-3 min, the water content of the dried sludge is: 20-30% (wet basis), and the total mass of the dried sludge is as follows: 5t, moisture removal amount: 15t, wherein the mass removed as water vapor: 10.5t, mass removed as liquid water: 4.5t;
specifically, in this embodiment, when the heat transfer oil in the heat transfer circulation system is not heating, the sludge screw pump in the wet sludge feeding device continues to work until the sludge dryer is cooled to the safety index and then is stopped stably. When the oil temperature in the heat conduction circulation system is too high, the sludge dryer automatically starts oil overtemperature protection, and the sludge dryer stops to protect the safety of the system.
The whole sludge dryer is designed by adopting a motor, a speed reducer and a gear transmission mechanism; the wet sludge is uniformly paved on a conveyor belt through a feeding device and enters a dryer, and sludge drying is realized through heat conduction; the dried sludge falls into the discharging device, is discharged from the discharging hole along with the transmission of the discharging device, and enters the dry sludge bin through the conveying mechanism to enter the next combustion stage.
Specifically, the calculation results of the conduction oil heat exchange system in this embodiment are shown in the following table:
when the temperature of the flue gas exhausted by the flue gas exhaust pipeline of the gasification combustion furnace boiler reaches a first temperature threshold, the inlet temperature of the heat transfer oil heat exchanger is used as a starting signal of the drying control system, so that the heat transfer oil circulation system heats the sludge dryer, and the wet sludge is dried by using the temperature of the heat transfer oil. And re-feeding the dried sludge into a gasification combustion boiler for incineration. In the process, the high-temperature flue gas exhausted by the flue gas exhaust pipeline of the gasification combustion furnace boiler can be recycled, and meanwhile, wet sludge is dried by the sludge dryer, so that energy is recycled, and meanwhile, the cost can be reduced.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. The wet sludge drying control system is characterized by comprising a heat conduction oil circulation system (1), a sludge dryer (3), a wet sludge feeding device (4), a steam condensing system (5) and a water circulation system (6);
the heat conduction oil circulation system (1) is used for heating the heat conduction oil in the heat conduction oil circulation system (1) through the flue gas exhausted by the gasification combustion furnace boiler;
the sludge dryer (3) is used for receiving the heat conduction oil in the heat conduction oil circulation system (1), and the temperature of the heat conduction oil is used for heating the sludge dryer (3);
the wet sludge feeding device (4) is used for conveying wet sludge into the sludge dryer (3) so as to dry the wet sludge through the sludge dryer after temperature rise;
the steam condensing system (5) is used for condensing steam generated in the drying operation process of the wet sludge; so as to convert the water vapor generated in the drying operation process of the wet sludge in the sludge dryer (3) into condensed water;
the water circulation system (6) is used for collecting the condensed water.
2. A wet sludge drying control system according to claim 1, characterized in that the conduction oil circulation system (1) comprises a conduction oil heat exchanger (18), a first circulation line (11) and a second circulation line (12);
the heat conduction oil heat exchanger (18) is connected with a flue gas discharge pipeline (9) of the gasification combustion furnace boiler so as to heat the heat conduction oil in the heat conduction oil circulation system (1) through flue gas discharged by the gasification combustion furnace boiler;
an oil outlet of the heat conduction oil heat exchanger (18) is connected with the sludge dryer (3) through a first circulating pipeline (11); an oil inlet of the heat conduction oil heat exchanger (18) is connected with the sludge dryer (3) through a second circulating pipeline (12).
3. A wet sludge drying control system according to claim 2, characterized in that the first circulation line (11) is provided with a heat transfer oil circulation pump (2).
4. A wet sludge drying control system according to claim 1, characterized in that the sludge dryer (3) is connected to the gasification burner boiler via a sludge silo.
5. A wet sludge drying control system according to claim 2, characterized in that the second circulation line (12) is provided with an expansion tank (7).
6. A method of controlling a wet sludge drying control system according to any one of claims 1 to 5, comprising the steps of:
s1: when the temperature of the flue gas exhausted by the flue gas exhaust pipeline of the gasification combustion furnace boiler enables the inlet temperature of the heat conduction oil heat exchanger to reach a first temperature threshold value, a heat conduction oil circulation system is started, and heat conduction oil circulates between the heat conduction oil heat exchanger and the sludge dryer;
s2: when the temperature of the heat conduction oil in the heat conduction oil circulation system is increased to a second temperature threshold value, the sludge dryer starts to operate at a first dryer operating frequency;
s3: when the temperature of the heat conduction oil in the heat conduction oil circulation system is increased to a third temperature threshold value, starting the wet sludge feeding device; wet sludge is supplied to a sludge dryer, and the wet sludge is dried while a water circulation system and a steam condensing system are started;
s4: and drying the wet sludge to obtain dried sludge with the water content of 20-30%, enabling the dried sludge to enter a dry storage bin, and waiting to enter a gasification combustion furnace boiler for incineration through a dry sludge feeding auger.
7. The method according to claim 6, wherein after the conduction oil circulation system is started, a conduction oil circulation pump provided on the first circulation line is turned on at a first water pump operation frequency, so that the conduction oil circulates between the conduction oil heat exchanger and the sludge dryer.
8. The method of claim 6, wherein the wet sludge feeding device supplies wet sludge having a water content higher than 80% to the sludge dryer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211613705.1A CN116986785A (en) | 2022-12-15 | 2022-12-15 | Wet sludge drying control system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211613705.1A CN116986785A (en) | 2022-12-15 | 2022-12-15 | Wet sludge drying control system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116986785A true CN116986785A (en) | 2023-11-03 |
Family
ID=88532782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211613705.1A Pending CN116986785A (en) | 2022-12-15 | 2022-12-15 | Wet sludge drying control system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116986785A (en) |
-
2022
- 2022-12-15 CN CN202211613705.1A patent/CN116986785A/en active Pending
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