Gas steam back-pressure cooling four-grade utilization electricity and water cold and hot steam heating system

Abstract

The invention discloses a gas steam back-pressure cooling four-grade utilization electricity and water cold and hot steam heating system. The system integrates such energy equipment as a gas turbine, an afterheat boiler, a back-pressure steam turbine and such functional equipment as a back-pressure heat supply switching loop, an organic Rankine cycle set, an absorption set and a heat supply pipe network; a networked remote management integrated system is built to seasonally balance a back-pressure heat supply quantity and a heat consumption quantity of multiple sets of functional equipment; the system realizes gas and steam second-grade cyclic power generation+warm air supply+steam supply in winter; the system realizes fuel and steam organic third-grade cyclic power generation+sanitary hot water supply+steam supply in spring and autumn; and the system realizes gas and steam second-grade cyclic power generation+process cold water supply+process hot water supply+steam supply in summer.

Description

(1) Technical field [0001] The invention relates to a gas steam back pressure cooling four-stage cooling and heating system using electric water in a distributed energy system. (2) Background technology [0002] In a gas-steam combined cycle power plant, electrical energy is generated in two separate power generation cycles: [0003] (1) The gas turbine generates electricity in the first stage cycle, the gas is mixed with air and combusted, and the high-pressure, high-temperature flue gas generated is sent to the gas turbine for expansion and work, which drives the impeller to rotate and drives the generator rotor to rotate to generate the first-stage power; The discharged low-pressure, high-temperature flue gas is introduced into the waste heat boiler, and the sensible heat of the flue gas is recovered to generate high-pressure, high-temperature superheated steam. [0004] (2) The second-stage cycle of the steam turbine generates electricity. The superheated steam is sent ...

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Problems solved by technology

[0007] (1) Power generation cycle of condensing steam turbine: only power generation without heat supply, so that a large amount of latent heat of condensation is not only not fully utilized, but also discharged into the environment through the evaporation of circulating water in the cooling tower, which not only consumes water resources but also causes environmental heat, Wet pollution; at the same time, the device is complicated, the investment is increased, the reliability is reduced, and the operating cost is increased, resulting in the system not being energy-saving and economical

[0008] (2) Extraction condensing steam turbine thermoelectric cycle: it not only generates electricity but also supplies heat. In summer, the condensed steam heat is still discharged to the environment through the evaporation of circulating water in the cooling tower, so it not only consumes water resources but also causes environmental heat and humidity pollution; and When steam is extracted from the middle stage of the steam turbine for heating in winter, the amount of steam extracted reduces the power generation; the cycle device is complex, with increased investment, reduced reliability, increased operating costs, no energy saving, and poor economy

However, this cycle uses heat to determine electricity, so when there is no heating load in spring, summer and autumn, the steam turbine needs to stop running, which in turn affects the gas turbine power generation cycle, resulting in gas emission

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