Do this one thing
Write down the material, the steam pressure and the hours this step runs.
Record only these
- The material being evaporated or concentrated
- Steam pressure or vacuum, and which side the steam heats
- The hours this step actually runs
- Whether the vapor is process vapor or a separate waste-heat stream
If the material, steam state or hours are still blank, measure or sketch them first. Do not choose a heat pump or vapor recompression from the steam bill alone.
Start with one evaporator
Choose one evaporator, concentrator or still. Record what it removes and which steam supply serves it. A plant steam total can feed several duties, so it cannot set the share this one step could change. Tonnes of steam are a mass, not useful heat. Pressure, condensate return and the system boundary also have to be known.
A closed heat pump and open vapor recompression are different routes
A closed heat pump uses electricity to lift a lower-temperature source up to steam or process heat. Open mechanical vapor recompression takes vapor the process itself produces and sends it back as the heating steam. The two are not interchangeable. Neither is chosen until the vapor state, the temperatures the process allows, and the process constraints are known.
Do not change the specified heating utility without process review. A boiling-point rise that has not been measured stays blank; do not fill it in from a similar product.
Bring these records
- Material, and whether the step removes water or another component.
- Steam pressure or vacuum, and whether steam touches the product or heats through a surface.
- Feed and product conditions when they are known. Leave boiling-point rise blank when it is not measured.
- Operating hours, including cleaning and shutdown.
- Condensate recovery that already exists.
Choose the next step
If the duty is still unclear, sketch the evaporator and mark steam in, vapor out and condensate. When those are known, open the steam and MVR pathway, then the focused screen. Screening does not size an evaporator or a vapor compressor.
Sources and limits
This is an editorial learning guide, not a plant audit or a measured savings result. Site inputs remain unknown until supplied and checked. Detailed design, procurement, hygienic and pressure-equipment decisions require qualified review. Read our editorial principles.
现在做这一件事
先写下蒸发的物料、蒸汽压力和运行时间。
现在只记这几项
- 蒸发或浓缩的是什么物料
- 蒸汽压力或真空度，以及蒸汽加热的是哪一侧
- 这一步实际运行多少小时
- 气流是工艺蒸汽本身，还是另一股余热
物料、蒸汽状态或运行时间还空着，就先补测或画简图。不要只凭蒸汽账单选择热泵或蒸汽再压缩。
先选一台蒸发或浓缩设备
先选一台蒸发器、浓缩设备或蒸馏釜，记下它除去什么、由哪路蒸汽供热。全厂蒸汽总量往往供给多个环节，不能直接当成这一步可以改掉的份额。蒸汽吨数是质量，不是可用热量；压力、凝结水回流和系统边界也要一起看。
闭式热泵和开式蒸汽再压缩不是同一条路
闭式热泵用电把较低温度的热源提升到蒸汽或工艺热。开式机械蒸汽再压缩取的是工艺自己产生的蒸汽，再送回去作加热蒸汽。两者不能互相替换。蒸汽状态、工艺允许的温度和工艺约束还没弄清之前，先不要选定哪一条。
未经工艺复核，不能更改规定的供热方式。沸点升高没有测过就留空，不要用相近产品的数字填上。
先准备这几类资料
- 物料，以及这一步除去的是水还是其他组分。
- 蒸汽压力或真空度，以及蒸汽是直接接触物料还是通过壁面加热。
- 已知的进料和出料条件。沸点升高没有测量就留空。
- 运行时间，包括清洗和停机。
- 已经在做的凝结水回收。
选择下一步
边界还不清楚时，先画简图，标出进汽、二次蒸汽和凝结水。这些清楚之后，再打开蒸汽与 MVR 路径，然后进入这条路径的初筛。初筛不定蒸发器或蒸汽压缩机的规格。
依据与使用边界
本文为编辑整理的入门指南，不是现场审计或实测节能成果。现场数据在提供并核对前保持未知。详细设计、采购、卫生与压力设备事项需要合格专业人员复核。参见编辑原则。
