Hot pipe EGR cooler

Abstract

The invention discloses a heat pipe EGR cooler, mainly comprising a shell and a heat pipe, wherein, two ends of the shell are provided with a waste gas inlet and a waste gas outlet respectively; and the heat pipe consists of a heating section, a steam pipe, a condensing section and a condensation pipe which are communicated from beginning to end. The invention is characterized in that the heating section is arranged in the shell. The principle of the invention is to adopt the heat pipe technology to cool waste gas, which can ensure that the temperature of the waste gas is lower and can effectively relieve the influence of the waste gas to the power per liter of the engine on the premise of the same recirculation waste gas amount. Meanwhile, the heat pipe EGR cooler can effectively reduce the negative effect of the reduced heat exchanging efficiency caused by caking, and can effectively avoid a leaking occasion of welding lines of flange faces between the shell and the waste gas inlet and the waste gas outlet.

Description

technical field [0001] The invention relates to a gas cooling device, in particular to an exhaust gas recirculation cooler. It can be widely used in power plants using exhaust gas recirculation. Background technique [0002] With the increasingly stringent emission requirements, exhaust gas recirculation technology is increasingly used in power plants. The basic principle is that part of the exhaust gas discharged for the first time is cooled and then returned to the engine to effectively reduce the formation of nitrogen oxides in the exhaust gas. There are two types of coolers in the traditional exhaust gas recirculation (EGR) process: shell-and-tube type and plate-fin type. The main disadvantages are as follows: 1. The traditional exhaust gas cooling method uses engine coolant for cooling. Since the coolant in the steam state will cause serious cavitation to the engine cooling circuit, the engine coolant always exists in liquid form under working conditions. That is to ...

AI Technical Summary

Problems solved by technology

The main disadvantages are as follows: 1. The traditional exhaust gas cooling method uses engine coolant for cooling. Since the coolant in the steam state will cause serious cavitation to the engine cooling circuit, the engine coolant always exists in liquid form under working conditions. That is to say, the exhaust gas cooling is carried away by the temperature rise of the engine coolant, which has a poor cooling effect.

2. The conventional EGR cooler adopts shell-and-tube or plate-fin structure, and the compact structure is easier to carbonize, which will greatly reduce the cooling efficiency of the EGR cooler

3. In the traditional shell-and-tube EGR cooler, the weld between the tube bundle and the end plates on both sides is obviously affected by thermal stress and is easy to leak

4. In the traditional shell-and-tube EGR cooler, the flow direction of the exhaust gas is the same as that of the coolant. The purpose is to reduce the degree of vaporization of the coolant, but the cooling effect of the forward flow is not as good as that of the reverse flow.

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