Gas-fired boiler for overheating foreign steam

Abstract

The invention relates to a gas-fired boiler for overheating foreign steam. The gas-fired boiler comprises a pot part composed of a steam pocket, a front forced-circulation evaporator, a composite overheater, a rear natural circulation evaporator and a coal economizer, and a furnace part composed of a combustor, a combustion chamber, an air preheater, a gas preheater, a furnace body and a chimney. The combustor is arranged at the front end of the furnace body, the chimney is arranged at the tail end of the furnace body, the front forced-circulation evaporator, the composite overheater, the rear natural circulation evaporator and the coal economizer are sequentially arranged in the furnace body from front to back, and the steam pocket is arranged above the outside of the furnace body. Middle-pressure steam generated by the gas-fired boiler and foreign low-pressure steam are mixed in a steam ejector, then enter the composite overheater, and are overheated to the needed overheating temperature, the steam can adapt to the change of the load of the foreign steam, continuous stable high-quality overheated steam is provided for a steam turbine generator unit for power generation or other heat users, efficient utilization of energy is achieved, and the aims of energy saving and emission reduction are achieved.

Description

technical field [0001] The invention relates to the technical field of gas boilers, in particular to a gas boiler for superheating external steam. Background technique [0002] China is a large country with a large population and a lack of resources. In the process of development, it still follows the "development first, governance later" model that most developed countries achieve industrialization at the cost of consuming resources and sacrificing the environment. my country is relatively short of oil and gas resources, but rich in coal resources. In my country's primary energy consumption, coal accounts for nearly 70%. With the rapid development of my country's economy, energy shortages and environmental pollution are becoming more and more serious. Energy and environmental problems can no longer be ignored. Energy conservation and emission reduction have become an important measure for my country's social and economic development. . [0003] In the metallurgy, building ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to solve the technical problems of unstable steam production and low utilization rate of low-temperature waste gas in the prior art, the present invention provides a gas-fired boiler for superheating external steam

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