A steam generator with high temperature difference, high pressure difference and easy maintenance

Abstract

The invention discloses a high temperature difference, high pressure difference and easily maintained steam generator, and relates to the field of petrochemical waste heat recovery. The steam generator comprises a pipe box and a shell which are mutually connected, a heat exchange pipe bundle and a floating head are arranged in the shell, the heat exchange pipe bundle comprises a first longitudinal pipe plate and a second longitudinal pipe plate, a plurality of heat exchange pipes are transversely arranged between the first pipe plate and the second pipe plate, the pipe box is fixedly connected with the shell through the first pipe plate, the floating head is connected with the shell through the second pipe plate and comprises an outlet pipe and an expansion joint, a floating head flange is fixed on the outer side wall of the outlet pipe, a reverse flange is arranged on the inner side wall of the shell and corresponds to the floating head flange, the floating head flange is connected with the floating head flange through a fixing part, 1-4 limit sliding ways are arranged at the bottom of the outer side of the outlet pipe, and a limit bolt is fixed at the bottom of each limit sliding way. The steam generator is safer, the heat exchange pipe bundle is detachably maintained, the use rate of the shell is increased, use cost is reduced, and the heat exchange efficiency of pipe and shell sides is improved.

Description

technical field [0001] The invention relates to the field of petrochemical waste heat recovery, in particular to a steam generator with high temperature difference, high pressure difference and easy maintenance. ) device reaction gas, MTA (Methanol to aromatics, methanol conversion to aromatics) device reaction gas and hydrogen production device conversion gas. Background technique [0002] Due to the pressure drop, the existing steam generators for petrochemical plants use single-tube fixed tube-sheet heat exchangers, which mainly exchange heat with the shell-side medium through the tube-side high-temperature medium. When used, there are the following defects: [0003] (1) The cross-section of the tube-side medium inlet is smaller than the cross-section of the medium flow. When the medium passes through the flow cross-section, the flow cannot be fully distributed, and the flow velocity and flow rate in each heat exchange tube are different, which affects the heat exchange e...

AI Technical Summary

Problems solved by technology

[0003] (1) The cross-section of the tube-side medium inlet is smaller than the cross-section of the medium flow. When the medium passes through the flow cross-section, the flow cannot be fully distributed, and the flow velocity and flow rate in each heat exchange tube are different, which affects the heat exchange efficiency.

[0004] (2) The fixed tube-sheet heat exchanger structure is not convenient for the maintenance of the heat exchange tube bundle. The heat exchange tube bundle cannot be pulled out and cleaned separately. Replacement of equipment, resulting in high cost

Images