CN106830603B - Step heat exchange pyrohydrolysis reactor - Google Patents
Step heat exchange pyrohydrolysis reactor Download PDFInfo
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- CN106830603B CN106830603B CN201710098847.1A CN201710098847A CN106830603B CN 106830603 B CN106830603 B CN 106830603B CN 201710098847 A CN201710098847 A CN 201710098847A CN 106830603 B CN106830603 B CN 106830603B
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- 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
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
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Abstract
The invention discloses a cascade heat exchange pyrohydrolysis reactor which is characterized by consisting of a heating furnace, four reactors, a heat exchanger and a circulating pump; the heat exchanger is positioned in the reactor; a furnace left valve and a furnace right valve are mounted at a heating medium inlet and outlet of the heating furnace, the furnace left valve is connected with a furnace left tee joint, the furnace right valve is connected with a furnace right tee joint, and a furnace separation valve is connected between the furnace left tee joint and the furnace right tee joint; a hot left valve and a hot right valve are mounted at a heating medium inlet and a heating medium outlet of the reactor, the hot left valve is connected with a hot left tee joint, the hot right valve is connected with a hot right tee joint, and a thermal isolation valve is connected between the hot left tee joint and the hot right tee joint; the furnace right tee is connected with the hot left tee of the reactor, the hot right tee of the reactor is connected with the hot left tee of the next reactor, and the steps are repeated until all the reactors are connected; the hot right tee joint of the last reactor is connected with the inlet of the circulating pump, and the outlet of the circulating pump is connected with the left tee joint of the furnace.
Description
Technical Field
The invention relates to a pyrohydrolysis device, in particular to a sludge pyrohydrolysis device.
Background
Researches show that after the sludge is subjected to pyrohydrolysis, the dehydration performance is improved, the water-soluble COD is improved, and the subsequent treatments such as deep dehydration or anaerobic digestion are facilitated. However, heating the sludge to a thermal hydrolysis temperature (about 200 ℃) requires a significant amount of energy, and therefore limits the application of this technique.
Sludge pyrohydrolysis is not an endothermic reaction, i.e. the reaction itself does not consume heat, which is mainly the heat that is cooled after the reaction, which cannot be recovered effectively. At present, part of energy can be recovered by means of flash evaporation and the like; however, flash evaporation is relatively complicated in its equipment due to the phase change process. The patent intends to recover heat in a mode of no phase change and step heat exchange.
Disclosure of Invention
The invention aims to solve the technical problem of providing a cascade heat exchange pyrohydrolysis reactor which has no water phase change and high energy utilization rate. It is characterized by comprising a heating furnace, more than two reactors, a heat exchanger and a circulating pump; the heat exchanger is positioned in the reactor; a furnace left valve and a furnace right valve are mounted at a heating medium inlet and outlet of the heating furnace, the furnace left valve is connected with a furnace left tee joint, the furnace right valve is connected with a furnace right tee joint, and a furnace separation valve is connected between the furnace left tee joint and the furnace right tee joint; a hot left valve and a hot right valve are mounted at a heating medium inlet and a heating medium outlet of the reactor, the hot left valve is connected with a hot left tee joint, the hot right valve is connected with a hot right tee joint, and a thermal isolation valve is connected between the hot left tee joint and the hot right tee joint; the furnace right tee is connected with the hot left tee of the reactor, the hot right tee of the reactor is connected with the hot left tee of the next reactor, and the steps are repeated until all the reactors are connected; the hot right tee joint of the last reactor is connected with the inlet of the circulating pump, and the outlet of the circulating pump is connected with the left tee joint of the furnace.
Compared with the prior art, the cascade heat exchange pyrohydrolysis reactor has the beneficial effects that: realize no phase transition cascade heat transfer, energy utilization is high.
Drawings
FIG. 1 is a schematic structural diagram of a cascade heat exchange pyrohydrolysis reactor according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example (b):
the cascade heat exchange pyrohydrolysis reactor shown in figure 1 consists of a heating furnace 1, more than two reactors 2, a heat exchanger 3 and a circulating pump 4; the heat exchanger 3 is positioned in the reactor 2; a furnace left valve 1-1 and a furnace right valve 1-2 are installed at a heating medium inlet and outlet of the heating furnace 1, the furnace left valve 1-1 is connected with a furnace left tee 1-3, the furnace right valve 1-2 is connected with a furnace right tee 1-4, and a furnace separation valve 1-5 is connected between the furnace left tee 1-3 and the furnace right tee 1-4; a hot left valve 2-1 and a hot right valve 2-2 are mounted at a heating medium inlet and a heating medium outlet of the reactor 2, the hot left valve 2-1 is connected with a hot left tee 2-3, the hot right valve 2-2 is connected with a hot right tee 2-4, and a heat isolating valve 2-5 is connected between the hot left tee 2-1 and the hot right tee 2-2; the furnace right tee 1-4 is connected with the hot left tee 2-3 of the reactor, the hot right tee 2-4 of the reactor is connected with the hot left tee 2-3 of the next reactor, and the steps are repeated until all the reactors 2 are connected; the hot right tee 2-4 of the last reactor 2 is connected with the inlet of the circulating pump 4, and the outlet of the circulating pump 4 is connected with the furnace left tee 1-3.
The working principle of the present embodiment is briefly described as follows:
four reactors 2 are arranged in this example and are designated A, B, C, D for ease of description. At the start-up, the four reactors are respectively filled with a liquid at a temperature Ta，Tb，Tc，TdSludge (T) of four temperaturesa＞Tb＞Tc＞Td). The method comprises the following steps:
step one, hydrolysis: the hot left valve 2-1 and the hot right valve 2-2 of the reactor B, C, D are closed; closing a thermal isolation valve 2-5 of the reactor A, and opening a thermal left valve 2-1 and a thermal right valve 2-2; closing a furnace isolation valve 1-5 of the heating furnace 1, and opening a furnace left valve 1-1 and a furnace right valve 1-2; and starting the circulating pump 4, heating the sludge in the reactor A, preserving heat and carrying out thermal hydrolysis reaction until thermal hydrolysis is finished. The circulation pump 4 is switched off.
Step two, heat exchange: closing a furnace left valve 1-1 and a furnace right valve 1-2, and opening a furnace partition valve 1-5; the state of the reactor A, C, D is the same as that of the first step, a thermal isolation valve 1-5 of the reactor B is closed, and a thermal left valve 2-1 and a thermal right valve 2-2 are opened; and starting the circulating pump 4 to perform AB heat exchange. When the temperature of the reactor B reaches a certain temperature, the circulating pump 4 is closed.
The hot left valve 2-1 and the hot right valve 2-2 of the reactor B are closed, and the thermal isolation valve 2-5 is opened. And opening a hot left valve 2-1 and a hot right valve 2-2 of the reactor C, closing a thermal isolation valve 2-5, and opening a circulating pump 4 to perform AC heat exchange. When the temperature of the reactor C reaches a certain temperature, the circulating pump 4 is closed.
The hot left valve 2-1 and the hot right valve 2-2 of the reactor C are closed, and the thermal isolation valve 2-5 is opened. And (3) opening a hot left valve 2-1 and a hot right valve 2-2 of the reactor D, closing a thermal isolation valve 2-5, and opening a circulating pump 4 to perform AD heat exchange. When the temperature of the reactor D reaches a certain temperature, the circulating pump 4 is closed.
Since the temperature of B, C, D is stepped down, reactor A can be cooled to a very low temperature (well below 100 ℃ C.) and since the reactor is always closed, no phase change occurs.
Step three, discharging and feeding: reactor a was opened, discharged and then fed.
Step four, repeating: after the third step, the temperature of the reactor is: t isb＞Tc＞Td＞TaAt this time, according to the operation modes of the first step, the second step and the third step, the reactor B is subjected to thermal hydrolysis, the heat exchange of BC, BD and BA is carried out, and after the reactor B is discharged and fed, the reactor C is operated, and the circulation is carried out, so that the continuous production is formed.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.
Claims (1)
1. A method for carrying out a pyrohydrolysis reaction by utilizing a cascade heat exchange pyrohydrolysis reactor is characterized in that the cascade heat exchange pyrohydrolysis reactor consists of a heating furnace, four reactors, a heat exchanger and a circulating pump; the heat exchanger is positioned in the reactor; a furnace left valve and a furnace right valve are mounted at a heating medium inlet and outlet of the heating furnace, the furnace left valve is connected with a furnace left tee joint, the furnace right valve is connected with a furnace right tee joint, and a furnace separation valve is connected between the furnace left tee joint and the furnace right tee joint; a hot left valve and a hot right valve are mounted at a heating medium inlet and a heating medium outlet of the reactor, the hot left valve is connected with a hot left tee joint, the hot right valve is connected with a hot right tee joint, and a thermal isolation valve is connected between the hot left tee joint and the hot right tee joint; the furnace right tee is connected with the hot left tee of the reactor, the hot right tee of the reactor is connected with the hot left tee of the next reactor, and the steps are repeated until all the reactors are connected; the hot right tee joint of the last reactor is connected with the inlet of the circulating pump, and the outlet of the circulating pump is connected with the left tee joint of the furnace;
a, B, C, D for each of the four reactors; at the start-up, the four reactors are respectively filled with the mixture with the temperature Ta、Tb、Tc、TdSludge of four temperatures, Ta＞Tb＞Tc＞TdThe method specifically comprises the following steps:
step one, hydrolysis: the hot left and right valves of reactor B, C, D are closed; closing a heat insulation valve of the reactor A, and opening a heat left valve and a heat right valve; closing a furnace partition valve of the heating furnace, and opening a furnace left valve and a furnace right valve; starting a circulating pump, heating the sludge in the reactor A, preserving heat, performing a thermal hydrolysis reaction, and closing the circulating pump until thermal hydrolysis is completed;
step two, heat exchange: closing a furnace left valve and a furnace right valve, and opening a furnace isolating valve; the state of the reactor A, C, D is the same as that of the first step, the thermal isolation valve of the reactor B is closed, and the thermal left valve and the thermal right valve are opened; starting a circulating pump to perform AB heat exchange, and closing the circulating pump after the temperature of the reactor B reaches a constant temperature;
closing the hot left valve and the hot right valve of the reactor B, and opening the thermal isolation valve; opening a hot left valve and a hot right valve of the reactor C, closing a heat insulation valve, opening a circulating pump, carrying out AC heat exchange, and closing the circulating pump after the reactor C reaches a constant temperature;
closing the hot left valve and the hot right valve of the reactor C, and opening the thermal isolation valve; opening a hot left valve and a hot right valve of the reactor D, closing a thermal isolation valve, and opening a circulating pump to perform AD heat exchange; when the temperature of the reactor D is constant, the circulating pump is closed;
step three, discharging and feeding: opening the reactor A, discharging and then feeding;
step four, repeating: the temperature of the reactor after the third step is as follows: t isb＞Tc＞Td＞TaAnd at the moment, according to the operation modes of the first step, the second step and the third step, carrying out thermal hydrolysis on the reactor B, carrying out heat exchange on BC, BD and BA, and circulating the reactor B, and then operating the reactor C after discharging and feeding the reactor B to form continuous production.
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| CN201710098847.1A CN106830603B (en) | 2017-02-23 | 2017-02-23 | Step heat exchange pyrohydrolysis reactor |
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| CN201710098847.1A CN106830603B (en) | 2017-02-23 | 2017-02-23 | Step heat exchange pyrohydrolysis reactor |
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| CN106830603B true CN106830603B (en) | 2020-10-27 |
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| CN112473563A (en) * | 2021-01-06 | 2021-03-12 | 轻工业环境保护研究所 | Step direct heat exchange hydrothermal reaction device |
| CN112759229B (en) * | 2021-01-18 | 2022-12-09 | 北京市科学技术研究院资源环境研究所 | Cascade heat exchange pyrohydrolysis reaction device for material mixing and operation method |
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| CN102162636B (en) * | 2011-04-11 | 2014-02-19 | 中国科学院电工研究所 | High-temperature heat storage and evaporation integrated device |
| CN204298217U (en) * | 2014-10-16 | 2015-04-29 | 轻工业环境保护研究所 | A kind of sludge hot hydrolysis reactor |
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