Heat exchanger and heat pump coupling heat exchange system utilizing tail smoke of waste heat boiler

Abstract

The utility model discloses a heat exchanger and heat pump coupling heat exchange system utilizing waste heat boiler tail smoke, which comprises a heat exchanger and a heat pump, and the heat exchanger is provided with a waste heat boiler tail smoke inlet, a smoke exhaust outlet, a low-temperature circulating water inlet and a high-temperature circulating water outlet. The heat pump is provided with a low-temperature urban heating water inlet, a high-temperature urban heating water outlet, a high-temperature circulating water inlet and a low-temperature circulating water outlet. The heat exchanger and the heat pump are combined into a whole efficient heat exchange system, and the comprehensive purposes of reducing the exhaust gas temperature of the waste heat boiler, improving the heat efficiency of the boiler and generating heat for urban heating are achieved. Flue gas waste heat of a waste heat boiler is mainly utilized deeply, and sensible heat and latent heat of flue gas are extracted and used for external centralized heat supply. And the consumption of other fossil energy does not need to be increased, the flue gas waste heat is extracted to realize low-temperature emission of the flue gas, the heat supply capacity under unit gas consumption is improved, the operation economy is improved, and the conversion from a low-quality heat source to a high-quality heat source is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste heat boiler technical field especially utilizes a heat exchanger and heat pump coupling heat exchange system of waste heat boiler tail flue gas. BACKGROUND

[0002] As an important parameter of waste heat boiler, the exhaust gas temperature directly affects the working efficiency and stability of the waste heat boiler, and has great significance for the safe and stable operation of the boiler. In the waste heat boiler, the traditional exhaust gas temperature mainly exists in high-temperature flue gas emission, which causes the gas energy not to be maximized and deeply utilized, resulting in the problem of energy waste.

[0003] To solve this problem, the conventional method is to increase the low-temperature economizer. However, this scheme will increase the maintenance and repair costs, and the economic efficiency is low, and the tail flue gas temperature after the low-temperature economizer cannot be deeply utilized. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, the utility model designs a heat exchanger and heat pump coupling heat exchange system utilizing waste heat boiler tail flue gas.

[0005] The utility model adopts the following technical scheme:

[0006] A heat exchanger and heat pump coupling heat exchange system utilizing waste heat boiler tail flue gas, comprising a heat exchanger and a heat pump, the heat exchanger is provided with a waste heat boiler tail flue gas inlet, an exhaust gas outlet, a low-temperature circulating water inlet and a high-temperature circulating water outlet, the heat pump is provided with a low-temperature city heating water inlet, a high-temperature city heating water outlet, a high-temperature circulating water inlet and a low-temperature circulating water outlet, the heat exchanger is connected to the high-temperature circulating water inlet of the heat pump through the high-temperature circulating water outlet, and the heat pump is connected to the low-temperature circulating water inlet of the heat exchanger through the low-temperature circulating water outlet. The waste heat boiler tail flue gas enters the heat exchanger and exchanges heat with the low-temperature circulating water, so that the flue gas temperature is reduced. The heat pump utilizes the heat released by the high-temperature circulating water outlet of the heat exchanger to heat the low-temperature city heating water, and the high-temperature city heating water after being heated can be used for city heating. The low-temperature circulating water enters the heat exchanger and exchanges heat with the high-temperature flue gas of the waste heat boiler, the high-temperature circulating water generated is discharged in the heat pump, and the low-temperature circulating water after being cooled continues to flow in the heat exchanger, so that the heat exchanger and the heat pump are coupled to exchange heat, and the working medium is recycled.

[0007] As a preferred, the high-temperature circulating water outlet is provided with an adjusting valve and a thermocouple, which are used for controlling the circulating water temperature and flow to meet the normal work of the heat exchanger and the heat pump.

[0008] Preferably, the inlet of the heat exchanger's heat-absorbing end is connected to the flue gas inlet at the tail end of the waste heat boiler, the outlet of the heat exchanger's heat-absorbing end is connected to the exhaust gas outlet, the inlet of the heat exchanger's heat-releasing end is connected to the low-temperature circulating water inlet, and the outlet of the heat exchanger's heat-releasing end is connected to the high-temperature circulating water outlet.

[0009] Preferably, the inlet of the heat pump's heat-absorbing end is connected to the high-temperature circulating water inlet, the outlet of the heat pump's heat-absorbing end is connected to the low-temperature circulating water outlet, the inlet of the heat pump's heat-releasing end is connected to the low-temperature urban heating water inlet, and the outlet of the heat pump's heat-releasing end is connected to the high-temperature urban heating water outlet.

[0010] The beneficial effects of this utility model are:

[0011] This invention aims to achieve the comprehensive goals of reducing the flue gas temperature of waste heat boilers, improving boiler thermal efficiency, and generating heat for urban heating. The main focus is on the deep utilization of waste heat from waste heat boilers, extracting sensible and latent heat for centralized external heating. This invention achieves low-temperature emissions by extracting waste heat from flue gas without increasing the consumption of other fossil fuels, while also increasing the heating capacity per unit of fuel consumption, improving operational economy, and realizing the transformation from a low-quality heat source to a high-quality heat source. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a system structure of this utility model;

[0013] In the diagram: 1. Heat exchanger, 2. Heat pump, 3. Waste heat boiler tail flue gas inlet, 4. Flue gas outlet, 5. Low temperature circulating water, 6. High temperature circulating water, 7. Low temperature urban heating water inlet, 8. High temperature urban heating water outlet. Detailed Implementation

[0014] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0015] Example: Figure 1 As shown, a heat exchanger and heat pump coupled heat exchange system suitable for efficient utilization of flue gas from the tail end of a waste heat boiler includes a heat exchanger 1, a heat pump 2, a flue gas inlet 3 for the tail end of the waste heat boiler, a flue gas outlet 4, low-temperature circulating water 5, high-temperature circulating water 6, a low-temperature urban heating water inlet 7, and a high-temperature urban heating water outlet 8. The heat exchanger and the heat pump are connected through circulating water. The low-temperature circulating water enters the heat exchanger, is heated, and then enters the heat pump. After releasing heat in the heat pump, the circulating water re-enters the heat exchanger for circulation.

[0016] The working principle of the utility model is: the waste heat boiler tail flue gas (about 90 DEG C) enters the heat exchanger and the low temperature circulating water to carry out heat exchange, so that the flue gas temperature is reduced (about 45 DEG C). The heat pump utilizes the heat released by the high temperature circulating water outlet of the heat exchanger to heat the low temperature city heating water, and the high temperature city heating water (about 90 DEG C) after temperature rise can be used for city heating. The low temperature circulating water (about 25 DEG C) enters the heat exchanger and carries out heat exchange with the waste heat boiler tail high temperature flue gas, the generated high temperature circulating water (about 40 DEG C) enters the heat pump and releases heat, and the circulating water (about 25 DEG C) after temperature reduction continues to enter the heat exchanger and circulates, so that the heat exchanger and the heat pump are coupled heat exchange, and the working medium is recycled.

[0017] The heat exchanger and the heat pump are combined into a whole high efficiency heat exchange system in the utility model, the comprehensive purposes of reducing the waste heat boiler flue gas temperature, improving the boiler thermal efficiency and generating heat for city heating are realized. The utility model mainly deeply utilizes the flue gas waste heat of the waste heat boiler, extracts the flue gas sensible heat and latent heat, and is used for external centralized heating. The utility model does not need to increase the consumption of other fossil energy, can extract the flue gas waste heat and realize the low temperature discharge of the flue gas, can also improve the heating capacity under the unit gas consumption, improves the operation economy, and realizes the change of low quality heat source to high quality heat source.

[0018] The above described embodiment is only a preferable scheme of the utility model, and does not limit the utility model in any form, and other variants and modifications are still possible without exceeding the technical scheme recorded in the claims.

Claims

1. A heat exchanger and heat pump coupled heat exchange system utilizing waste heat boiler tail flue gas, comprising a heat exchanger and a heat pump, characterized in that: The heat exchanger is provided with a waste heat boiler tail flue gas inlet, a flue gas outlet, a low-temperature circulating water inlet and a high-temperature circulating water outlet, the heat pump is provided with a low-temperature city heating water inlet, a high-temperature city heating water outlet, a high-temperature circulating water inlet and a low-temperature circulating water outlet, the heat exchanger is connected to the high-temperature circulating water inlet of the heat pump through the high-temperature circulating water outlet, and the heat pump is connected to the low-temperature circulating water inlet of the heat exchanger through the low-temperature circulating water outlet.

2. The heat exchanger and heat pump coupled heat exchange system utilizing the exhaust flue gas of a waste heat boiler according to claim 1, characterized in that: The high-temperature circulating water outlet is provided with an adjusting valve and a thermocouple for controlling the temperature and flow of the circulating water.

3. The heat exchanger and heat pump coupled heat exchange system utilizing the exhaust flue gas of a waste heat boiler according to claim 1, characterized in that: The inlet of the heat absorption end of the heat exchanger is connected to the waste heat boiler tail flue gas inlet, the outlet of the heat absorption end of the heat exchanger is connected to the flue gas outlet, the inlet of the heat release end of the heat exchanger is connected to the low-temperature circulating water inlet, and the outlet of the heat release end of the heat exchanger is connected to the high-temperature circulating water outlet.

4. The heat exchanger and heat pump coupled heat exchange system utilizing the exhaust flue gas of a waste heat boiler according to claim 1, characterized in that: The inlet of the heat absorption end of the heat pump is connected to the high-temperature circulating water inlet, the outlet of the heat absorption end of the heat pump is connected to the low-temperature circulating water outlet, the inlet of the heat release end of the heat pump is connected to the low-temperature city heating water inlet, and the outlet of the heat release end of the heat pump is connected to the high-temperature city heating water outlet.

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