WO2014107912A1 - 低压蒸汽回收过热系统 - Google Patents

低压蒸汽回收过热系统 Download PDF

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Publication number
WO2014107912A1
WO2014107912A1 PCT/CN2013/070562 CN2013070562W WO2014107912A1 WO 2014107912 A1 WO2014107912 A1 WO 2014107912A1 CN 2013070562 W CN2013070562 W CN 2013070562W WO 2014107912 A1 WO2014107912 A1 WO 2014107912A1
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Prior art keywords
steam
heat carrier
low
pressure
carrier boiler
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PCT/CN2013/070562
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English (en)
French (fr)
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蔡京鹏
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Cai Jingpeng
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Publication of WO2014107912A1 publication Critical patent/WO2014107912A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G5/00—Controlling superheat temperature
    • F22G5/16—Controlling superheat temperature by indirectly cooling or heating the superheated steam in auxiliary enclosed heat-exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
    • F01K3/14—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having both steam accumulator and heater, e.g. superheating accumulator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G1/00—Steam superheating characterised by heating method
    • F22G1/16—Steam superheating characterised by heating method by using a separate heat source independent from heat supply of the steam boiler, e.g. by electricity, by auxiliary combustion of fuel oil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/005—Drying-steam generating means

Definitions

  • the utility model relates to a steam drying device, in particular to a steam drying device for reheating waste steam exhaust gas discharged from a pressure vessel to a high temperature state.
  • the steam drying equipment involved has the following problems: 1.
  • the boiler producing superheated steam has a large pressure, and the equipment input is high; 2.
  • the pressure of the steam exhaust gas discharged from the pressure vessel is low.
  • the temperature is low, it is considered that it has no drying ability and is directly discharged, and a large amount of water vaporization heat is wasted; 3.
  • the steam for drying is all obtained by heating and vaporizing water by a boiler, and the amount of steam is large and the energy consumption is high.
  • the system can greatly improve the drying capacity and save the amount of steam in the production process, thereby achieving the purpose of energy saving and consumption reduction.
  • a low pressure steam recovery superheating system comprising a pressure vessel and an industrial boiler providing high temperature superheated steam to the pressure vessel; further comprising a waste steam storage tank and a heat carrier boiler; the pressure vessel, the waste steam storage tank, and the heat carrier boiler
  • the sequential circulation connection constitutes a low-pressure steam recovery superheating circuit; the pipeline connecting the waste steam storage tank of the pressure vessel is provided with a steam exhaust gas inlet valve, and the steam exhaust steam tank is connected with the steam carrier gas outlet valve, and the steam exhaust gas outlet valve is arranged on the pipeline, the heat carrier
  • the boiler is connected to the pressure vessel and is provided with a superheated steam intake valve.
  • the steam exhaust steam tank connected to the heat carrier boiler is further provided with a steam tail gas bypass gas outlet valve, and the heat carrier boiler is connected with the pressure vessel to be provided with a superheated steam bypass gas outlet valve.
  • the waste steam storage tank is provided with a condensed water discharge port, and the condensed water discharge is provided with a steam trap.
  • an automatic safety valve is further disposed on the pipe of the heat carrier boiler connected to the pressure vessel.
  • the steam heat exchange tube disposed in the heat carrier boiler is a 15 chrome molybdenum alloy steam heat exchange tube.
  • the low-pressure steam superheat recovery system of the utility model converts the low-pressure low-temperature steam discharged from the pressure vessel into a low-pressure high-temperature superheated steam, so that it has a high enthalpy value, can greatly improve the drying capacity, and saves the production process. Other steam usage to achieve energy savings. Simple, sensitive and rapid control of the steam flow through the valve, thereby improving the stability and safety of the system.
  • the utility model uses the heat carrier boiler to perform secondary heating to the high temperature state of the exhaust steam discharged from the pressure vessel, and the operation is simple, and the energy saving and the consumption are reduced, and the whole process equipment investment is small, the land occupation is small, and the utility model has a strong Technical advantages.
  • FIG. 1 is a schematic structural view of a low pressure steam recovery superheating system of the present invention
  • FIG. 2 is a schematic structural view of a heat carrier boiler of the present invention.
  • a low pressure steam recovery superheating system as shown in Figure 1, the system comprising a pressure vessel and an industrial boiler providing high temperature superheated steam to the pressure vessel, and a waste steam storage tank and a heat carrier boiler.
  • the pressure vessel, the waste steam storage tank, and the heat carrier boiler are sequentially cyclically connected to form a low pressure steam recovery superheat circuit. That is, the low-temperature and low-pressure steam discharged from the pressure vessel is concentratedly discharged into the steam storage tank, and then the steam is supplied to the heat carrier boiler through the waste steam storage tank for secondary heating.
  • the heated steam can reach a temperature above 450 ° C and then re-delivered to a pressure vessel or dryer for the drying medium used for drying.
  • the steam of the heat carrier boiler must maintain a pressure of 0.05 MPa or more.
  • a steam exhaust gas intake valve 1 is arranged on the pipeline connecting the waste steam storage tank of the pressure vessel, and a steam exhaust gas outlet valve 4 is arranged on the pipeline connecting the waste steam storage tank to the heat carrier boiler, and the heat carrier boiler is connected to the pressure vessel and the pipeline is superheated.
  • Steam intake valve 6 By controlling the steam exhaust gas intake valve 1, the steam exhaust gas outlet valve 4 and the superheated steam intake valve 6, the control of the steam flow rate can be achieved, and the control of the hot steam temperature can be realized. Combined with the amount of coal burned by the heat carrier boiler and the air volume of the heat carrier boiler fan, the control of the whole system is more sensitive, rapid, and more convenient to operate.
  • the steam exhaust steam tank connected to the heat carrier boiler of the utility model is further provided with a steam tail gas bypass gas outlet valve 4, and the hot carrier boiler is connected with the superheated steam bypass gas outlet valve 7 on the pipeline connecting the pressure vessel.
  • the steam off-gas bypass valve 4 and the superheated steam bypass outlet valve 7 can remove the malfunctioning device from the system in some special cases without affecting the operation of other devices of the system.
  • the waste steam storage tank of the utility model is provided with a condensed water discharge port, and the condensed water discharge is provided with a steam trap 2 .
  • the condensed water in the steam exhaust gas is discharged from the steam storage tank by the steam trap 2 to reduce the water content in the steam to reduce the amount of steam.
  • the steam heat exchange tube 8 disposed in the heat carrier boiler is a 15 chrome molybdenum alloy steam heat exchange tube, and the 15 chrome molybdenum alloy tube is resistant to high temperature and corrosion, and has a safe temperature resistance of up to 800 ° C.
  • the pipeline of the heat carrier boiler connected to the pressure vessel of the present invention is further provided with an automatic safety valve 5 for protecting the pipeline in the system.
  • the automatic safety valve 5 is clogged or broken in the steam heat exchange tube 8 or the pressure vessel of the heat carrier boiler, and cannot be normally exhausted, so that the pressure of the heat exchange tube in the heat carrier boiler rises.
  • the automatic safety valve 5 automatically opens the pressure relief to protect the heat carrier boiler and the operator.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)

Abstract

一种低压蒸汽回收过热系统，该系统由压力容器、废汽储汽罐、热载体锅炉依次循环连接构成一低压蒸汽回收过热回路；压力容器连接废汽储汽罐的管道上设置有一蒸汽尾汽进汽阀（1），废汽储汽罐连接热载体锅炉的管道上设置有一蒸汽尾汽出汽阀（4）和一蒸汽尾汽旁路出汽阀（3），热载体锅炉连接压力容器的管道上设置由一过热蒸汽进汽阀（6）、一过热蒸汽旁路出汽阀（7）和一自动安全阀（5），废汽储汽罐上设置疏水阀（2），置于热载体锅炉内的蒸汽换热管（8）为15铬钼合金蒸汽换热管。

Description

低压蒸汽回收过热系统 技术领域
本实用新型涉及一种蒸汽烘干设备，尤其是指一种对压力容器排放的废汽尾气进行二次加热到高温状态重新回收利用的蒸汽烘干设备。
背景技术
通常需要用高温过热蒸汽在压力容器里烘干物料时，涉及的蒸汽烘干设备存在以下问题：①.生产过热蒸汽的锅炉压力要大，设备投入高；②.压力容器排放的蒸汽尾气压力低，温度低，被认为没有烘干能力而被直接排放掉，浪费了大量的水汽化热；③.烘干用的蒸汽全部是由锅炉将水加热汽化而得，蒸汽用量大，耗能高。
实用新型内容
针对现有技术中存在的问题，本实用新型的目的是提供一种低压蒸汽回收过热系统。该系统可以大幅度提高其烘干能力，节省生产过程中的蒸汽用量，从而达到节能降耗的目的。
本实用新型解决其技术问题所采取的技术方案是：
低压蒸汽回收过热系统，该系统包括一压力容器和一向压力容器提供高温过热蒸汽的工业锅炉；还包括有一废汽储汽罐和一热载体锅炉；所述压力容器、废汽储汽罐、热载体锅炉依序循环连接构成一低压蒸汽回收过热回路；压力容器连接废汽储汽罐的管道上设置有蒸汽尾气进气阀，废汽储汽罐连接热载体锅炉的管道上设置有蒸汽尾气出气阀，热载体锅炉连接压力容器的管道上设置有过热蒸汽进气阀。
进一步，废汽储汽罐连接热载体锅炉的管道上还设置有蒸汽尾气旁路出气阀，热载体锅炉连接压力容器的管道上还设置有过热蒸汽旁路出气阀。
进一步，所述废汽储汽罐上设置有凝结水排放口，该凝结水排放设置有疏水阀。
进一步，热载体锅炉连接压力容器的管道上还设置有一自动安全阀。
进一步，设置于热载体锅炉内的蒸汽换热管为15铬钼合金蒸汽换热管。
与现有技术相比，本实用新型的有益效果是：
本实用新型低压蒸汽过热回收系统把压力容器排放的低压低温蒸汽用热载体锅炉转化为低压高温过热蒸汽，使它具有较高的焓值，可以大幅度提高其烘干能力，节省生产过程中的其它蒸汽用量从而达到节能降耗。通过阀门对蒸汽流量进行简单、灵敏，迅速的控制，进而提高系统的稳定性和安全性。本实用新型用热载体锅炉对压力容器排放的废汽尾气进行二次加热到高温状态重新回收利用的操作简单，做到了节能降耗，且整个工艺设备投资省，占地小，具有很强的技术优势。
附图说明
图1是本实用新型低压蒸汽回收过热系统的结构示意图；
图2是本实用新型热载体锅炉的结构示意图。
具体实施方式
如图1所示的低压蒸汽回收过热系统，该系统包括一压力容器和一向压力容器提供高温过热蒸汽的工业锅炉，还包括有一废汽储汽罐和一热载体锅炉。
所述压力容器、废汽储汽罐、热载体锅炉依序循环连接构成一低压蒸汽回收过热回路。也就是压力容器排放的低温低压蒸汽集中排放到废汽储汽罐里，然后经过废汽储汽罐向热载体锅炉供汽，进行二次加热。经过加热后的蒸汽温度可达到450℃以上，然后再重新输送给压力容器或烘干机做烘干所用热媒介。为保证热载体锅炉内蒸汽的流动性，热载体锅炉的蒸汽必须保持0.05兆帕以上的压力。
压力容器连接废汽储汽罐的管道上设置有蒸汽尾气进气阀1，废汽储汽罐连接热载体锅炉的管道上设置有蒸汽尾气出气阀4，热载体锅炉连接压力容器的管道上设置有过热蒸汽进气阀6。通过对蒸汽尾气进气阀1、蒸汽尾气出气阀4和过热蒸汽进气阀6的控制，来做到对蒸汽流量的控制，也就能够实现对热蒸汽温度的控制。再配合热载体锅炉燃煤量大小和热载体锅炉风机的风量大小，使整个系统的控制更灵敏，迅速，操作更方便。
本实用新型废汽储汽罐连接热载体锅炉的管道上还设置有蒸汽尾气旁路出气阀4，热载体锅炉连接压力容器的管道上还设置有过热蒸汽旁路出气阀7。蒸汽尾气旁路出气阀4和过热蒸汽旁路出气阀7可以在出现一些特殊情况时，把出现故障的设备从系统中切除，而不影响系统的其它设备运行。
本实用新型废汽储汽罐上设置有凝结水排放口，该凝结水排放设置有疏水阀2。从废汽储汽罐上把蒸汽尾气中的凝结水利用疏水阀2排出，降低蒸汽中的含水量，以减少蒸汽用量。
如图2所示，设置于热载体锅炉内的蒸汽换热管8为15铬钼合金蒸汽换热管，该15铬钼合金管耐高温、耐腐蚀，安全耐温可达800℃。
本发明热载体锅炉连接压力容器的管道上还设置有一对系统中的管道起保护作用的自动安全阀5。该自动安全阀5在热载体锅炉的蒸汽换热管8或压力容器发生堵塞或故障，不能正常排气，致使热载体锅炉内的换热管压力升高。当压力升高到一定程度时，自动安全阀5自动开启泄压，以保护热载体锅炉和操作人员的安全。
以上实施例仅为说明本实用新型的技术思想，不能以此限定本实用新型的保护范围，凡是按照本实用新型提出的技术思想，在技术方案基础上所做的任何改动，均落入本实用新型保护范围之内。

Claims (9)

  1. 低压蒸汽回收过热系统，该系统包括一压力容器和一向压力容器提供高温过热蒸汽的工业锅炉；其特征在于：还包括有一废汽储汽罐和一热载体锅炉；所述压力容器、废汽储汽罐、热载体锅炉依序循环连接构成一低压蒸汽回收过热回路；压力容器连接废汽储汽罐的管道上设置有蒸汽尾气进气阀，废汽储汽罐连接热载体锅炉的管道上设置有蒸汽尾气出气阀，热载体锅炉连接压力容器的管道上设置有过热蒸汽进气阀。
  2. 如权利要求1所述的低压蒸汽回收过热系统，其特征在于：废汽储汽罐连接热载体锅炉的管道上还设置有蒸汽尾气旁路出气阀，热载体锅炉连接压力容器的管道上还设置有过热蒸汽旁路出气阀。
  3. 如权利要求1或2所述的低压蒸汽回收过热系统，其特征在于：所述废汽储汽罐上设置有凝结水排放口，该凝结水排放设置有疏水阀。
  4. 如权利要求1或2所述的低压蒸汽回收过热系统，其特征在于：热载体锅炉连接压力容器的管道上还设置有一自动安全阀。
  5. 如权利要求3所述的低压蒸汽回收过热系统，其特征在于：热载体锅炉连接压力容器的管道上还设置有一自动安全阀。
  6. 如权利要求1或2所述的低压蒸汽回收过热系统，其特征在于：设置于热载体锅炉内的蒸汽换热管为15铬钼合金蒸汽换热管。
  7. 如权利要求3所述的低压蒸汽回收过热系统，其特征在于：设置于热载体锅炉内的蒸汽换热管为15铬钼合金蒸汽换热管。
  8. 如权利要求4所述的低压蒸汽回收过热系统，其特征在于：设置于热载体锅炉内的蒸汽换热管为15铬钼合金蒸汽换热管。
  9. 如权利要求5所述的低压蒸汽回收过热系统，其特征在于：设置于热载体锅炉内的蒸汽换热管为15铬钼合金蒸汽换热管。
PCT/CN2013/070562 2013-01-11 2013-01-16 低压蒸汽回收过热系统 WO2014107912A1 (zh)

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Publication number Priority date Publication date Assignee Title
CN103062756A (zh) * 2013-01-11 2013-04-24 蔡京鹏 低压蒸汽回收过热控制系统
CN112106619A (zh) * 2020-09-23 2020-12-22 中国农业科学院都市农业研究所 一种利用过热蒸汽将园林废弃物转化为基质材料的方法

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US4571949A (en) * 1985-04-18 1986-02-25 Moke Harold C Cogeneration and sludge drying system
CN201476510U (zh) * 2009-09-15 2010-05-19 何国豪 压缩式干热风制备装置
CN201837064U (zh) * 2010-09-14 2011-05-18 王海波 有机热载体锅炉余热高效回收系统
CN201836865U (zh) * 2010-08-24 2011-05-18 舒城诚信包装材料有限公司 一种蒸汽回收装置
CN202369480U (zh) * 2011-12-09 2012-08-08 合肥水泥研究设计院 一种利用水泥窑尾低温废气干化污泥的装置
CN103062756A (zh) * 2013-01-11 2013-04-24 蔡京鹏 低压蒸汽回收过热控制系统

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4571949A (en) * 1985-04-18 1986-02-25 Moke Harold C Cogeneration and sludge drying system
CN201476510U (zh) * 2009-09-15 2010-05-19 何国豪 压缩式干热风制备装置
CN201836865U (zh) * 2010-08-24 2011-05-18 舒城诚信包装材料有限公司 一种蒸汽回收装置
CN201837064U (zh) * 2010-09-14 2011-05-18 王海波 有机热载体锅炉余热高效回收系统
CN202369480U (zh) * 2011-12-09 2012-08-08 合肥水泥研究设计院 一种利用水泥窑尾低温废气干化污泥的装置
CN103062756A (zh) * 2013-01-11 2013-04-24 蔡京鹏 低压蒸汽回收过热控制系统

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