Temperature rise control system of high-pressure liquefied hydrocarbon pump

Abstract

The invention discloses a temperature rise control system of a high-pressure liquefied hydrocarbon pump. The temperature rise control system comprises an axial force balancing mechanism and a mechanical-seal self-washing mechanism; a liquid returning hole is formed in the first-stage middle section of the mechanical-seal self-washing mechanism; a second-stage middle section sealing rubber ring is mounted between the second-stage middle section and an outer cylinder body of the mechanical-seal self-washing mechanism; a sucking box sealing rubber ring is mounted among a sucking box, the outer cylinder body and the first-stage middle section; one end of a balancing liquid returning pipe component is connected with a balancing chamber through a pump cover; the other end of the balancing liquid returning pipe component is connected with a second-stage impeller sucking chamber through the outer cylinder body; one end of a forward washing pipe component is connected with the outlet of a first-stage impeller; the other end of the forward washing pipe component is connected with a mechanical sealing component at a driving side; one end of a backward washing pipe component is connected with the sucking chamber; the other end of the backward washing pipe component is connected with the mechanical sealing component at the non-driving side. The temperature rise control system also comprises a self-control backflow type thermal control mechanism. The temperature rise control system disclosed by the invention is capable of preventing gasification of a pumped medium, improving cooling and lubrication of a mechanically-sealed end face, reducing the quantity of minimal continuous heat limit flow, reducing energy consumption and guaranteeing safe and reliable running of the pump.

Description

technical field [0001] The invention relates to the field of pump valves, in particular to a multistage centrifugal high-pressure liquefied hydrocarbon pump, which includes a temperature rise control system composed of an axial force balance mechanism, a mechanical seal self-flushing mechanism and the like. Background technique [0002] The liquefied hydrocarbon pump belongs to the light hydrocarbon pump, and it transports dangerous media that are flammable, explosive, easy to vaporize and volatile, low density, low ignition point, and high saturated vapor pressure, and the change of temperature is extremely sensitive to its vaporization pressure. For example, low-carbon liquid ethylene, butane and propylene. Liquefied hydrocarbon pumps, especially high-pressure liquefied hydrocarbon pumps, are the most critical dynamic equipment in the processes of petrochemical industry and petroleum refining plants. [0003] At present, vertical high-speed pumps (tangential pumps) or rec...

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Problems solved by technology

Such a flushing scheme, if the pump vaporizes, will affect the stability of the self-flushing pressure of the mechanical seal, which may lead to a series of operational failures such as mechanical seal damage and leakage.

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