Water vapor cycle based on supercritical and subcritical heat regeneration

Abstract

The invention discloses a water vapor cycle based on supercritical and subcritical heat regeneration, and belongs to the field of steam engine devices. A low-temperature vapor outlet of a compression supercritical heat regeneration system is connected with a low-temperature vapor inlet of a Rankine cycle system, and a high-temperature vapor inlet of the compression supercritical heat regeneration system is connected with a high-temperature vapor outlet of the Rankine cycle system, a low-temperature water inlet of the compression supercritical heat regeneration system is connected with a low-temperature water outlet of the Rankine cycle system; a low-temperature water inlet of a second high-temperature heat regenerator, a main tee joint and a low-temperature vapor inlet of a first high-temperature heat regenerator are sequentially connected; and low-temperature vapor flowing out of a first compressor and low-temperature vapor flowing out of the second high-temperature heat regenerator are converged into the first high-temperature heat regenerator for heat exchange. A working medium in the cycle is in a supercritical state, the cycle mass flow rate is high, feed water can be generally heated to 400 DEG C or above, due to the characteristics, the average heat absorption temperature is increased, and the cycle heat efficiency is further improved.

Description

technical field

[0001] The invention belongs to the technical field of steam engine devices, in particular to a steam cycle based on super- and subcritical heat recovery. Background technique

[0002] At present, coal-fired power generation accounts for 39.3% of the world's total power generation. Coal-fired power generation provides a stable and sufficient power supply for the world. Although the new energy power generation technology is developing rapidly, the current situation that coal-fired power generation plays a leading role in power generation technology will not change in the short and medium term, and the pressure of resources, environment and climate change makes coal-fired power generation face challenges. Therefore, it is still of great significance to explore and promote efficient and clean coal-fired power generation technology.

[0003] The steam Rankine cycle is a mature advanced technology and is the power cycle of conventional coal-fired power plants. W...

Examples

Embodiment 1

[0031] When Example 1 works,

[0032] In the compression supercritical heat recovery system 200, the low temperature working medium (low temperature water) entering from the low temperature water inlet of the compression supercritical heat recovery system 200 (the low temperature water inlet of the second high temperature regenerator 210) passes through the second high temperature heat recovery system. After exchanging heat with the high-temperature steam flowing out of the first high-temperature regenerator 208, the high-temperature steam flowing out of the first compressor 209 joins at the main tee 201, and then enters the first high-temperature regenerator 208 together with the compressor. The high-temperature steam inlet of the supercritical heat recovery system 200 (the high-temperature steam inlet of the first high-temperature regenerator 208) flows into the high-temperature steam with a steam pressure of 22.1-26MPa for heat exchange and is heated to 400°C-490°C; the seco...

Embodiment 2

[0035] When Example 2 works,

[0036] In the compression supercritical heat recovery system 200, the low temperature water entering from the low temperature water inlet of the compression supercritical heat recovery system 200 (the low temperature water inlet of the third high temperature regenerator 212) passes through the third high temperature regenerator 212 and the second After heat exchange, the high-temperature steam flowing out of the high-temperature regenerator 210 merges with the low-temperature steam flowing out of the second compressor 211 at the auxiliary tee 202, and then enters the second high-temperature regenerator 210 and the first high-temperature regenerator 208 After exchanging heat, the outgoing high-temperature steam merges with the low-temperature steam compressed by the first compressor 209 at the main tee 201, and then enters the high-temperature steam inlet of the first high-temperature regenerator 208 and the compression supercritical heat recovery ...

Embodiment 3

[0043] When working in Example 3,

[0044] In the compression supercritical heat recovery system 200, the low-temperature steam with a temperature of 321°C entering from the low-temperature water inlet of the compression supercritical heat recovery system 200 (the low-temperature water inlet of the second high-temperature regenerator 210) passes through the second high-temperature heat recovery system. After exchanging heat with the high-temperature steam flowing out of the first high-temperature regenerator 208, the high-temperature steam flowing out of the first compressor 209 at the main tee 201 merges with the low-temperature steam flowing out of the first compressor 209, and then enters the first high-temperature regenerator 208 together with the compressor The high-temperature steam inlet of the supercritical heat recovery system 200 (the high-temperature steam inlet of the first high-temperature regenerator 208 ) flows into the high-temperature steam for heat exchange, a...

technical field

[0001] The invention belongs to the technical field of steam engine devices, in particular to a steam cycle based on super- and subcritical heat recovery. Background technique

[0002] At present, coal-fired power generation accounts for 39.3% of the world's total power generation. Coal-fired power generation provides a stable and sufficient power supply for the world. Although the new energy power generation technology is developing rapidly, the current situation that coal-fired power generation plays a leading role in power generation technology will not change in the short and medium term, and the pressure of resources, environment and climate change makes coal-fired power generation face challenges. Therefore, it is still of great significance to explore and promote efficient and clean coal-fired power generation technology.

[0003] The steam Rankine cycle is a mature advanced technology and is the power cycle of conventional coal-fired power plants. W...

Examples

Embodiment 1

[0031] When Example 1 works,

[0032] In the compression supercritical heat recovery system 200, the low temperature working medium (low temperature water) entering from the low temperature water inlet of the compression supercritical heat recovery system 200 (the low temperature water inlet of the second high temperature regenerator 210) passes through the second high temperature heat recovery system. After exchanging heat with the high-temperature steam flowing out of the first high-temperature regenerator 208, the high-temperature steam flowing out of the first compressor 209 joins at the main tee 201, and then enters the first high-temperature regenerator 208 together with the compressor. The high-temperature steam inlet of the supercritical heat recovery system 200 (the high-temperature steam inlet of the first high-temperature regenerator 208) flows into the high-temperature steam with a steam pressure of 22.1-26MPa for heat exchange and is heated to 400°C-490°C; the seco...

Embodiment 2

[0035] When Example 2 works,

[0036] In the compression supercritical heat recovery system 200, the low temperature water entering from the low temperature water inlet of the compression supercritical heat recovery system 200 (the low temperature water inlet of the third high temperature regenerator 212) passes through the third high temperature regenerator 212 and the second After heat exchange, the high-temperature steam flowing out of the high-temperature regenerator 210 merges with the low-temperature steam flowing out of the second compressor 211 at the auxiliary tee 202, and then enters the second high-temperature regenerator 210 and the first high-temperature regenerator 208 After exchanging heat, the outgoing high-temperature steam merges with the low-temperature steam compressed by the first compressor 209 at the main tee 201, and then enters the high-temperature steam inlet of the first high-temperature regenerator 208 and the compression supercritical heat recovery ...

Embodiment 3

[0043] When working in Example 3,

[0044] In the compression supercritical heat recovery system 200, the low-temperature steam with a temperature of 321°C entering from the low-temperature water inlet of the compression supercritical heat recovery system 200 (the low-temperature water inlet of the second high-temperature regenerator 210) passes through the second high-temperature heat recovery system. After exchanging heat with the high-temperature steam flowing out of the first high-temperature regenerator 208, the high-temperature steam flowing out of the first compressor 209 at the main tee 201 merges with the low-temperature steam flowing out of the first compressor 209, and then enters the first high-temperature regenerator 208 together with the compressor The high-temperature steam inlet of the supercritical heat recovery system 200 (the high-temperature steam inlet of the first high-temperature regenerator 208 ) flows into the high-temperature steam for heat exchange, a...

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