Selection of steam turbines for generator sets in large-scale methanol projects

Are the above questions difficult? I consulted an expert today, and he believes that back-pressure generator sets are primarily used for process steam generation, which is in line with the principles of a circular economy; **they support this approach ； On the other hand, extraction-type generator sets are primarily designed for power generation, and **no support is provided for them**. Please discuss whether his statement is correct Furthermore, I believe back-pressure generator sets are not suitable for regulating the steam demand in large chemical enterprises. What are others’ opinions on this?

The experts’ views make sense. What you said, that \"back-pressure generator sets are not suitable for regulating the steam demand of large chemical enterprises,\" is indeed true; this requires greater effort to achieve balance throughout the entire plant.

Brief reply: 1. First of all, it should be noted that steam extraction, condensing, or combined steam extraction and condensing turbogenerators are absolutely not allowed to be used; this rule has been in effect since last year, and it applies even to cogeneration systems. Even for back-pressure steam turbine generators to be installed, they must undergo approval from the Development and Reform Commission as well as recognition and authorization by the power grid company. 2. The “Notice issued by the **Development and Reform Commission and the Ministry of Construction” dated January 17, 2007” (Document No. Fa Gai Neng Yuan 141) came into effect. The document specifies clearly that: · Within the heating coverage area of existing thermal power plants, it is generally not permissible to plan and construct additional thermal power plants for use by enterprises. Except for large enterprises in the petrochemical, chemical, steel, and paper industries, the construction of cogeneration projects that serve a single enterprise is restricted. ·In cogeneration projects, back-pressure cogeneration units are given priority. ·The power generation capacity of back-pressure units is not included in the controlled scale for power construction. 3. From the perspective of chemical production requirements, back-pressure generator sets are indeed less suitable for regulating steam demand in large chemical enterprises compared to extraction-type steam turbine generators; the established industrial policies cannot be changed. 4. Don’t you see that in China, generator sets with a single-unit capacity of less than 200MW (including those used for combined heat and power generation as well as those operated by the four major power companies) have been shut down one after another amid the drive for \"energy conservation and emission reduction\"? That’s how it is in China: policies are changeable and unpredictable; one must study them carefully and implement them thoroughly.

Back-pressure type units do not pose any obstacles to the regulation of steam demand in large chemical enterprises. I work in the fertilizer industry and have been studying the methanol production process recently; our compressors are of the back-pressure type. Their functions are similar, and the regulation of steam usage varies depending on the load, with differences in pumping in and out of air. It might be difficult to explain this concept clearly, but I firmly disagree with the idea that back-pressure type units hinder the regulation of steam demand in large chemical enterprises. I welcome any insights from those who are more knowledgeable