CN106479524B - Dry quenching boiler sewage recycling device and process - Google Patents

Dry quenching boiler sewage recycling device and process Download PDF

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Publication number
CN106479524B
CN106479524B CN201611005115.5A CN201611005115A CN106479524B CN 106479524 B CN106479524 B CN 106479524B CN 201611005115 A CN201611005115 A CN 201611005115A CN 106479524 B CN106479524 B CN 106479524B
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blow
sewage
dry quenching
expander
water
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CN106479524A (en
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张义飞
姜宁
金基浩
任众
何玉涛
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Acre Coking and Refractory Engineering Consulting Corp MCC
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Acre Coking and Refractory Engineering Consulting Corp MCC
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B39/00—Cooling or quenching coke
    • C10B39/02—Dry cooling outside the oven
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Coke Industry (AREA)

Abstract

A dry quenching boiler blow-down water recycling device and process, the device includes periodic blow-down expander, continuous blow-down expander, dry quenching furnace, blow-down well, blow-down pump, level gauge, set up blow-down well in the low reaches of periodic blow-down expander, blow-down pump is set up in blow-down well, blow-down pump pass pipeline connect dry quenching furnace water seal trough of entrance, there are three pipe heaters on the connecting line of blow-down pump and water seal trough, connect steam connecting line of continuous blow-down expander and deaerator, steam blow-off pipeline of periodic blow-down expander and steam blow-off pipeline of blow-down well respectively; a liquid level meter is arranged in the sewage well, and a liquid level meter is also arranged in a water seal tank of the dry quenching furnace. The invention pumps the sewage in the sewage well of the dry quenching boiler into the water seal tank of the dry quenching boiler, heats the sewage by the steam waste heat of the boiler, prevents the cracking of the water seal tank and effectively realizes the recycling of the sewage of the dry quenching boiler.

Description

Dry quenching boiler blow-down water recycling device and process
Technical Field
The invention relates to a dry quenching process system in the field of coking and metallurgy, in particular to a process for recycling boiler sewage water of a dry quenching boiler for a dry quenching water seal tank.
Background
The quality of the feed water of the coke dry quenching boiler is one of important factors influencing the safety, stability and economic operation of a steam-water system of the boiler, such as: scaling, salt accumulation, corrosion and the like of a steam-water system of the dry quenching boiler can be caused. In order to make the water quality index of boiler feed water meet the relevant standard requirements, raw water must be treated, such as: precipitating, filtering, removing hardness, desalting, deoxidizing and the like so as to ensure the safe operation of the dry quenching boiler. Nevertheless, during operation, the steam-water system of the dry quenching boiler still generates a certain amount of salt and impurities, and the salt and the impurities corrode a heating surface, affect heat exchange or block pipelines. Thus, dry quenching boilers use blowdown systems to discharge "waste". The sewage discharge system is divided into two parts of continuous sewage discharge and periodic sewage discharge: the continuous blowdown is to continuously discharge water with higher salt content in the boiler steam drum into the continuous blowdown expander so as to ensure that the salt content in the boiler is controlled within a normal range; the periodic blowdown is to periodically discharge impurities and water slag inside the boiler into the periodic blowdown expander to avoid scaling or blockage of the pipeline.
According to the requirements of national standards, the amount of sewage discharged by the boiler with the medium temperature and pressure parameters is not more than 1-2% of the rated evaporation capacity of the boiler. The part of sewage is discharged into a sewage well through a sewage expander and is discharged outside after being cooled. The indexes of hardness and the like of the boiler blow-off water are superior to those of industrial water, the boiler blow-off water is relatively clean water, the temperature is relatively high, and the boiler blow-off water is uneconomical to directly discharge. Taking a dry quenching boiler with rated evaporation capacity of 100t/h as an example, the amount of sewage discharged by the boiler is (1-2) t/h and is higher than 80 ℃, and direct discharge is a great waste of water resources. Therefore, the recycling of the blow-off water of the coke dry quenching boiler is imperative.
The top of the dry quenching furnace is provided with a water seal tank to solve the sealing problem of the furnace top. Generally, industrial water or circulating cooling water (such water has a relatively high hardness) is used as the sealing water of the water seal tank. In the operation process, the water seal tank is easy to scale, the bottom is often adhered or bonded with attachments with poor heat conductivity, and when industrial water or circulating cooling water is supplemented, the water seal tank is easy to deform and crack due to cold and hot temperature difference. The hardness of the dry quenching boiler sewage is far lower than that of industrial water or circulating cooling water, so that the problem of scaling does not exist, and the temperature is higher. Therefore, the problem of cracking of the water seal tank can be solved by adopting the discharged sewage of the dry quenching boiler to replace industrial water or circulating cooling water as the sealing and supplementing water of the water seal tank, and the safe operation of the water seal tank can be ensured.
The patent document with the application number of 201610096544.1 discloses a boiler blow-off water treatment device and a method for a dry quenching system, which are characterized in that boiler blow-off water is pumped into a water seal tank through a fixed-discharge flash tank, a cooler, a water tank and a booster pump in sequence; this patent has realized that the sealed make-up water of boiler blow off water as water seal tank has carried out recovery and reuse, but this patent is sent into the water seal tank after the cooler cooling with boiler blow off water, causes the blow off water and the further increase of water seal tank difference in temperature, and the water seal tank is because thermal stress very easily causes the phenomenon of fracture.
In addition, in the patent document, a balance water tank is arranged at a platform of the loading device, the water level of the water seal tank is equal to the edge of an overflow port of the water seal tank, and water automatically flows into the water seal tank, so that water can continuously overflow out of the water seal tank.
Disclosure of Invention
The invention aims to provide a device and a process for recycling sewage of a dry quenching boiler. The utilization rate of the sewage is ensured through the interlocking relation of the liquid level of the water seal tank, the liquid level of the sewage well and the sewage pump. Effectively realizes the recycling of the sewage discharged by the coke dry quenching boiler.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dry quenching boiler blow-off water recycling device comprises a periodic blow-off expander, a continuous blow-off expander, a dry quenching furnace, a blow-off well, a blow-off pump and a liquid level meter, wherein the blow-off well is arranged at the downstream of the periodic blow-off expander, the blow-off pump is arranged in the blow-off well, the blow-off pump is connected with a water seal tank at the inlet of the dry quenching furnace through a pipeline, three pipeline heaters are arranged on a connecting pipeline of the blow-off pump and the water seal tank, and a steam connecting pipeline for respectively connecting the continuous blow-off expander and a deaerator, a steam diffusing pipeline for the periodic blow-off expander and a steam diffusing pipeline for the blow-off well are respectively arranged on the connecting pipeline; a liquid level meter is arranged in the sewage well, a liquid level meter is also arranged in a water seal tank of the dry quenching furnace, and a temperature detecting instrument is arranged on a water inlet pipeline for discharging sewage in the water seal tank.
A process for recycling the blow-off water of a coke dry quenching boiler by adopting a blow-off water recycling device of the coke dry quenching boiler comprises the following specific steps:
pumping and conveying the sewage in the sewage well of the dry quenching boiler into a water seal tank of the dry quenching boiler by using a sewage pump, interlocking the sewage level with the sewage pump, and controlling the water level of the water seal tank of the dry quenching boiler;
arranging a pipeline heater on a sewage discharge pipeline, and heating sewage by using steam of a boiler periodic sewage discharge expander, a continuous sewage discharge expander and a sewage discharge well when a sewage discharge pump runs so that the temperature of the sewage sent to a water seal tank of a dry quenching furnace reaches 85-95 ℃;
when the blow-down pump stops running, the steam of the continuous blow-down expander is sent to the deaerator to be deaerated, and the steam of the periodic blow-down expander and the blow-down well is diffused.
Compared with the prior art, the invention has the beneficial effects that:
a blow-down water recycling device and a process for a dry quenching boiler are characterized in that a blow-down pump is adopted to pressurize and convey blow-down water in a blow-down well of the dry quenching boiler into a water seal tank of the dry quenching boiler, and the blow-down water is heated by waste heat of steam diffused by a recovery boiler, so that the temperature of the blow-down water is close to that of water in the water seal tank of the dry quenching boiler, cracking of the water seal tank is prevented, and recycling of the blow-down water of the dry quenching boiler is effectively realized. The invention controls the water level of the water seal tank of the dry quenching furnace and the sewage pump in an interlocking way through the automatic control system, and synchronously controls the temperature of the sewage water, thereby ensuring the safe operation of the water seal tank.
Drawings
FIG. 1 is a schematic structural view of a dry quenching boiler blow-down water recycling device of the present invention.
In the figure: 1-continuous blowdown expander, 2-periodic blowdown expander, 3-blowdown well, 4-blowdown pump, 5-liquid level meter, 6-central processing unit, 7-dry quenching furnace, 8-water seal tank, 9-pipeline heater, 10-temperature detecting instrument and 11-valve.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
a dry quenching boiler blow-down water recycling device comprises a periodic blow-down expander 2, a continuous blow-down expander 1, a dry quenching furnace 7, a blow-down well 3, a blow-down pump 4 and a liquid level meter 5, wherein the blow-down well 3 is arranged at the downstream of the periodic blow-down expander 2, the blow-down pump 4 is arranged in the blow-down well 3, the blow-down pump 4 is connected with a water seal tank 8 at the inlet of the dry quenching furnace 7 through a pipeline, the water seal tank 8 is provided with 4 blow-down water inlets (1 is opened for 3), the consistency of the water level of the blow-down water entering the water seal tank is ensured to the maximum extent, three pipeline heaters 9 are arranged on a connecting pipeline of the blow-down pump 4 and the water seal tank 8, and a steam connecting pipeline for respectively connecting the continuous blow-down expander 1 and a deaerator, a steam diffusing pipeline for the periodic blow-down expander 2 and a steam diffusing pipeline for the blow-down well 3 are respectively arranged; a liquid level meter 5 is arranged in the sewage well 3, the liquid level meter 5 is also arranged in a water seal tank 8 of the dry quenching furnace 7, and a temperature detecting instrument 10 is arranged on a water inlet pipeline for discharging sewage in the water seal tank 8.
The pipe heater 9 is a closed sleeve pipe sleeved on a sewage draining pipeline, the inside of the closed sleeve pipe is communicated with the sewage draining pipeline, a steam inlet on the pipe heater 9 is connected with a steam diffusing pipeline at the upper ends of the regular sewage discharging expander 2 and the sewage discharging well 3 through a pipeline, the steam diffusing pipeline is connected with a steam connecting pipeline of the continuous sewage discharging expander 1 and the deaerator, and the steam is dredged to the sewage draining pipeline through the pipe heater 9 and is heated for draining sewage. Be equipped with valve 11 on pipe heater 9 steam inlet line, valve 11 and the periodic blowdown expander 2 on the pipe heater 9 steam inlet line, central processing unit 6 is connected respectively to the steam conduit valve of continuous blowdown expander 1 and blowdown well 3 upper ends, be provided with temperature-detecting instrument 10 on the inlet channel of 8 blowdown waters in water seal tank, central processing unit 6 is given with the blowdown water temperature signal transmission who gathers to temperature-detecting instrument 10, the opening of the valve on each steam conduit is controlled by central processing unit, thereby the steam flow in the control pipe heater 9 and the temperature of blowdown water.
The liquid level meter 5 in the sewage well 3 and the liquid level meter in the water seal tank 8 are respectively connected with the central processing unit 6, the liquid level detection signal is transmitted to the central processing unit 6, and the central processing unit 6 controls the flow of the sewage pump 4 according to the liquid level signal to carry out interlocking control on the sewage pump 4.
A process for recycling the blow-off water of a coke dry quenching boiler by adopting a blow-off water recycling device of the coke dry quenching boiler comprises the following specific steps:
adding pressure to the sewage in the sewage well 3 of the dry quenching boiler by using a sewage pump 4, conveying the sewage into a water-sealed tank 8 of a dry quenching furnace 7, interlocking the sewage level with the sewage pump 4, and controlling the water level of the water-sealed tank 8 of the dry quenching furnace 7;
a pipeline heater 9 is arranged on the sewage discharge pipeline, when the sewage discharge pump 4 runs, the steam of the boiler periodic sewage discharge expander 2, the continuous sewage discharge expander 1 and the sewage discharge well 3 is utilized to heat the sewage, so that the temperature of the sewage sent to the water seal tank 8 of the dry quenching furnace 7 reaches 85-95 ℃;
when the sewage pump 4 stops running, the steam of the continuous sewage expander 1 is sent to a deaerator for deoxidization, and the steam of the periodic sewage expander 2 and the sewage well 3 is diffused.
At present, steam of the boiler continuous blowdown expander 1 is used for deaerating a deaerator, and steam of the periodic blowdown expander 2 and steam of the boiler blowdown well 3 are diffused. The steam is wasted by diffusing the steam, the steam of the continuous blowdown expander 1, the steam of the periodic blowdown expander 2 and the steam of the blowdown well 3 are integrated and recycled, the blowdown water sent to the water seal tank 8 is heated, the steam is fully recycled, the temperature difference between the blowdown water and the water seal tank 8 is reduced, and the cracking of the water seal tank 8 is effectively prevented.

Claims (1)

1. A dry quenching boiler blow-down water recycling device comprises a periodic blow-down expander, a continuous blow-down expander and a dry quenching furnace, and is characterized by also comprising a blow-down well, a blow-down pump and a liquid level meter, wherein the blow-down well is arranged at the downstream of the periodic blow-down expander, the blow-down pump is arranged in the blow-down well, the blow-down pump is connected with a water seal tank at the inlet of the dry quenching furnace through a pipeline, three pipeline heaters are arranged on a connecting pipeline of the blow-down pump and the water seal tank, and a steam connecting pipeline, a steam diffusing pipeline of the periodic blow-down expander and a steam diffusing pipeline of the blow-down well are respectively connected with the continuous blow-down expander and a deaerator; a liquid level meter is arranged in the sewage well, the liquid level meter is also arranged in a water seal tank of the dry quenching furnace, and a temperature detecting instrument is arranged on a water inlet pipeline for discharging sewage in the water seal tank;
the process for recycling the sewage of the coke dry quenching boiler by adopting the sewage recycling device of the coke dry quenching boiler comprises the following specific steps:
pumping and conveying the sewage in the sewage well of the dry quenching boiler into a water seal tank of the dry quenching boiler by using a sewage pump, interlocking the sewage level with the sewage pump, and controlling the water level of the water seal tank of the dry quenching boiler;
arranging a pipeline heater on a sewage discharge pipeline, and heating sewage by using steam of a boiler periodic sewage discharge expander, a continuous sewage discharge expander and a sewage discharge well when a sewage discharge pump runs so that the temperature of the sewage sent to a water seal tank of a dry quenching furnace reaches 85-95 ℃;
when the blow-down pump stops running, the steam of the continuous blow-down expander is sent to the deaerator to be deaerated, and the steam of the periodic blow-down expander and the blow-down well is diffused.
CN201611005115.5A 2016-11-11 2016-11-11 Dry quenching boiler sewage recycling device and process Active CN106479524B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111517380A (en) * 2020-03-31 2020-08-11 临涣焦化股份有限公司 Comprehensive recycling system for coke dry quenching wastewater
CN113551220B (en) * 2021-07-22 2022-04-01 广东鸿业建材科技有限公司 Based on boiler waste heat recovery utilizes system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006135711A2 (en) * 2005-06-10 2006-12-21 Nanologix, Inc. System for sustained microbial production of hydrogen gas in a bioreactor
JP4074521B2 (en) * 2003-01-16 2008-04-09 新日本製鐵株式会社 Combustible gas recovery method during biomass processing in CDQ
CN103836606A (en) * 2012-11-25 2014-06-04 哈尔滨弘盛电力设备有限公司 Sewerage waste heat recovery device
CN104633644A (en) * 2014-12-10 2015-05-20 北京京诚科林环保科技有限公司 Regularly-discharged waste water waste heat recycling system of converter waste heat boiler
CN105542801A (en) * 2016-02-22 2016-05-04 山东钢铁股份有限公司 Boiler-discharged-wastewater treating device and method for coke dry quenching system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4074521B2 (en) * 2003-01-16 2008-04-09 新日本製鐵株式会社 Combustible gas recovery method during biomass processing in CDQ
WO2006135711A2 (en) * 2005-06-10 2006-12-21 Nanologix, Inc. System for sustained microbial production of hydrogen gas in a bioreactor
CN103836606A (en) * 2012-11-25 2014-06-04 哈尔滨弘盛电力设备有限公司 Sewerage waste heat recovery device
CN104633644A (en) * 2014-12-10 2015-05-20 北京京诚科林环保科技有限公司 Regularly-discharged waste water waste heat recycling system of converter waste heat boiler
CN105542801A (en) * 2016-02-22 2016-05-04 山东钢铁股份有限公司 Boiler-discharged-wastewater treating device and method for coke dry quenching system

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