Dual-tower parallel urea synthesizing device

Abstract

The invention relates to a dual-tower parallel urea synthesizing device, comprising two urea synthesizing towers. Each urea synthesizing tower is communicated with respective liquid ammonia feed pipe,carbon dioxide feed pipe and nail liquid feed pipe; discharge pipes are respectively arranged at the tops of the two urea synthesizing towers; two discharge pipes are connected together and then communicated with a discharge main pipe; and the size and the specification of the two urea synthesizing towers are same. The dual-tower parallel urea synthesizing device reduces the production strength of the urea synthesizing towers, prolongs the stay time of materials in the synthesizing towers, improves the urea synthesizing conversion rate and the yield capacity, has less investment and quick extension and production, saves labor force and matched facilities, allows to repair synthesizing towers having faults or stop the overhaul of any one synthesizing tower under the condition of not stopping production and has simples operation and flexible adjustment.

Description

technical field [0001] The invention relates to urea production equipment, in particular to a double-tower parallel urea synthesis device. Background technique [0002] Most of the current small and medium-sized urea production units adopt the full circulation production process of aqueous solution. This technology uses a synthesis tower with a set of pipelines, and the conversion rate is low. In theory, improving the conversion rate of urea in a single column can be achieved by increasing the number of trays, adopting high-efficiency trays, increasing the flow rate to form a plug flow, and reducing the aspect ratio. However, in practice, due to production intensity, production load, and manufacturing standards Influenced by other factors, the effect of improving the conversion rate of urea production is not obvious and cannot reach the theoretical value. Moreover, the above-mentioned method requires large investment, complicated operation, and poor feasibility; in addition,...

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Problems solved by technology

[0002] Most of the current small and medium-sized urea production units adopt the full circulation production process of aqueous solution. This technology uses a synthesis tower with a set of pipelines, and the conversion rate is low.

In theory, improving the conversion rate of urea in a single column can be achieved by increasing the number of trays, adopting high-efficiency trays, increasing the flow rate to form a plug flow, and reducing the aspect ratio. However, in practice, due to production intensity, production load, and manufacturing standards Influenced by other factors, the effect of improving the conversion rate of urea production is not obvious and cannot reach the theoretical value. Moreover, the above-mentioned method requires large investment, complicated operation, and poor feasibility; in addition, in the single-tower urea synthesis process, once the synthesis tower fails, it must be Shutdown for maintenance may easily cause large production losses

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