SOLID SCR SYSTEM AND HEATING METHOD FOR SOLID SCR REDUCTANT USING THE SAME

• US 20130047584A1
• Filed: 12/01/2011
• Published: 02/28/2013
• Est. Priority Date: 08/30/2011
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: PARK, Jun Sung
• Granted Patent: US 8,893,484 B2
• Time in Patent Office: Days
• US Class Current: 60/274
• CPC Class Codes: F01N 2610/02 the substance being ammonia or urea
• CPC Class Codes: F01N 2610/10 the substance being heated, e.g. by heating tank or supply line of the added substance
• CPC Class Codes: F01N 2610/12 the substance being in solid form, e.g. pellets or powder
• CPC Class Codes: F01N 2610/14 Arrangements for the supply of substances, e.g. conduits
• CPC Class Codes: F01N 3/2066 Selective catalytic reduction [SCR]
• CPC Class Codes: F01N 5/02 the devices using heat
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A solid SCR system includes solid state reductant, a container storing the solid state reductant, an exhaust pipe supplying gas state reductant converted from the solid state reductant and SCR catalyst disposed on the exhaust pipe, an exhaust heat recovery device disposed on the exhaust pipe and recovering waste heat from exhaust gas exhausted through the exhaust pipe and a heat exchanger connected to the exhaust heat recovery device and supplying the recovered heat to the solid state reductant.

Claims

1. A solid SCR system comprising:

a solid state reductant;

a container storing the solid state reductant;

an exhaust pipe supplying gas state reductant converted from the solid state reductant;

a SCR catalyst disposed on the exhaust pipe;

an exhaust heat recovery device disposed on the exhaust pipe and recovering waste heat from exhaust gas exhausted through the exhaust pipe; and

a heat exchanger connected to the exhaust heat recovery device and supplying the recovered heat to the solid state reductant.

2. The solid SCR system of claim 1, wherein the solid SCR system further comprises a flow control valve disposed within the exhaust pipe for selectively supplying the exhaust gas to the exhaust heat recovery device.

3. The solid SCR system of claim 1, wherein the exhaust heat recovery device comprises:

an insulation member disposed around a circumference of the exhaust heat recovery device for insulating heat; and

a partition for guiding the exhaust gas within the exhaust heat recovery device.

4. The solid SCR system of claim 1, wherein the heat exchanger comprises:

a circulation pipe in which heat transfer fluid circulates;

a pump circulating the heat transfer fluid within the circulation pipe; and

a heat diffusion fin releasing the heat transferred from the heat transfer fluid.

5. The solid SCR system of claim 1, wherein the heat exchanger is connected to a heat storage device storing the recovered heat.

6. A heating method for solid SCR reductant using a solid SCR system comprising a container storing solid state reductant and an exhaust heat recovery device recovering waste heat from exhaust gas exhausted through a exhaust pipe by heat exchange, the heating method comprising:

(a) comparing temperature and pressure within the container with predetermined temperature and pressure values;

(b) comparing temperature of the exhaust heat recovery device with the temperature within the container when the temperature and pressure within the container is lower than the predetermined values in the step (a);

(c) recovering waste heat from the exhaust gas by heat exchange with the exhaust gas in the exhaust heat recovery device when the temperature of the exhaust heat recovery device is higher than the temperature within the container in the step (b); and

(d) heating the solid state reductant by the recovered heat.

7. The heating method of claim 6, wherein the heating method further comprises:

stopping the heat exchange with the exhaust gas when the temperature and pressure within the container is higher than the predetermined values in the step (a).

8. The heating method of claim 6, wherein the heating method further comprises:

stopping the heat exchange with the exhaust gas when the temperature of the exhaust heat recovery device is lower than the temperature within the container in the step (b).