Exhaust Gas Heat Exchangers - Gasketed Plate Heat Exchanger

These heat exchangers are designed to remove thermal energy from the exhaust gas of natural gas, diesel and bio-fuel engines and transfer it to the water circuit. The extracted heat can be used for space heating, domestic hot water and any industrial process that requires hot water.

  • Standard range available for quick delivery.
  • Suitable for engines up to 1MW.
  • Suitable for use with engines powered by conventional and alternative fuels.
  • Fully welded stainless steel construction for reliability and durability.
  • Can also be used to extract energy from gas or air and transfer it to the water circuit.
  • Compact and highly efficient design for ease of installation.
  • Ideal to reduce the exit temperature of the exhaust gases in hazardous areas.
  • Used in conjunction with jacket water, charge air, fuel and oil coolers, Bowman units can reclaim up to 60% of waste heat from an engine.
  • Bowman units when fitted provide FREE HEATING & HOT WATER.

Given the following information, our thermal engineers can recommend a unit specific to your requirements:
Fuel type
Exhaust Gas Mass Flow Rate
Exhaust Gas Inlet Temperature
Water Circuit Inlet Temperature and Flow Rate

Typical set up showing full heat transfer configuration for CHP using Bowman Heat Exchangers

Provision should be made for cooling the engine water, oil and gas when heat recovery is not required.

Typical examples of exhaust gas heat exchanger performance

The figures below are a general guide only and are not based on any particular natural gas engine. They assume an air/fuel ratio of 10.23 : 1 by volume, a fuel consumption of 0.34m3/kWh (measured at 1.013 bar and 15oC) and an exhaust gas temperature of 600oC and a water inlet temperature of 80oC.

Type Gen Set Rating Performance
  Typical Engine power kW Exhaust gas flow kg/min Exhaust gas outlet temp °C Heat recovery kW Exhaust gas pressure drop kPa
2-25-3737-4
2-32-3737-5
16
16
1.2
1.2
210
170
9.5
10.5
2.4
2.8
3-32-3738-5
3-40-3738-6
3-60-3738-8
32
32
32
2.4
2.4
2.4
210
170
120
19
21
23
2.4
2.8
3.4
4-32-3739-5
4-40-3739-6
4-60-3739-8
60
60
60
4.5
4.5
4.5
210
170
120
35
39
43
2.2
2.4
3.0
5-32-3740-5
5-40-3740-6
5-60-3740-8
90
90
90
6.7
6.7
6.7
210
170
120
52
57
65
2.1
2.4
2.9
6-32-3741-5
6-40-3741-6
6-60-3741-8
140
140
140
10.5
10.5
10.5
210
170
120
82
90
101
2.2
2.4
3.0
8-32-3742-5
8-40-3742-6
8-60-3742-8
250
250
250
18.7
18.7
18.7
210
170
120
147
160
181
2.3
2.5
3.0
10-32-3743-5
10-40-3743-6
10-60-3743-8
400
400
400
30.0
30.0
30.0
210
170
120
236
256
288
2.4
2.6
3.1
12-32-3744-5
12-40-3744-6
12-60-3744-8
600
600
600
45.0
45.0
45.0
210
170
120
353
380
425
2.3
2.5
3.1

For larger sizes contact our sales department.  100kPa-1 bar
Maximum working gas side pressure 0.5 bar  Maximum working gas side temperature 700ºC
Maximum working water side pressure 4 bar  Maximum working water side temperature 110ºC

European Pressure Equipment Directive

This range of products fall within Article 3 Paragraph 3 (Sound Engineering Practice) and do not require CE marking.

Combined Heat Recovery Performance Table

his table shows the heat that can be removed from each type of heat exchanger as shown in the illustration on page 2.

Type Gen Set rating kva Jacket Water kW Engine Oil kW Charge Air Cooler kW Exhaust Gas kW Total Reclaimed Energy kW
2" 16 5 2 2.5 11.5 20.5
3" 32 10 4 5 23 41
4" 60 18 7 9 43 77
5" 90 27 10 14 65 115
6" 140 42 15 21 101 179
8" 250 75 28 38 181 321
10" 400 120 44 60 288 512
12" 600 180 66 90 425 761

Above figures are used as a guide only, optimised design available on request.

  A B C D E F H J K L M N P R Kgs
2-25-3737-4
2-32-3737-5
mm
754
932
mm
540
718
mm
584
762
mm
60.3
60.3
mm
100
100
mm
75
75
mm
83
83
mm
60
60
mm
9
9
BSP
R P3⁄4 "
R P3⁄4 "
mm
34
34
mm
75
75
mm
4x11
4x11
mm
16
16
10
12
3-32-3738-5
3-40-3738-6
3-60-3738-8
962
1164
1672
718
920
1428
762
964
1472
89
89
89
140
140
140
60
60
60
75
75
75
70
70
70
9
9
9
RP1"
RP1"
RP1"
54
54
54
110
110
110
4x14
4x14
4x14
16
16
16
18
20
27
4-32-3739-5
4-40-3739-6
4-60-3739-8
992
1194
1702
698
900
1408
762
964
1472
114
114
114
160
160
160
80
80
80
90
90
90
85
85
85
9
9
9
RP1 2"
RP1 1⁄2"
RP1 1⁄2"
66
66
66
130
130
130
4x14
4x14
4x14
22
22
22
24
28
42
5-32-3740-5
5-40-3740-6
5-60-3740-8
1032
1234
1742
688
890
1398
967
624
1472
141
141
141
190
190
190
100
100
100
105
105
105
100
100
100
11
11
11
RP2"
RP2"
RP2"
82
82
82
150
150
150
4x18
4x18
4x18
26
26
26
36
39
51
  A B C D E F H J K L M N P R Kgs
6-32-3741-5
6-40-3741-6
6-60-3741-8
mm
1082
1284
1792
mm
668
870
1378
mm
762
964
1472
mm
168
168
168
mm
210
210
210
mm
130
130
130
mm
120
120
120
mm
140
140
140
mm
11
11
11
Flange
DN60*
DN60*
DN60*
mm
104
104
104
mm
170
170
170
mm
4x18
4x18
4x18
mm
28
28
28
51
53
75
8-32-3742-5
8-40-3742-6
8-60-3742-8
1152
1354
1862
648
850
1358
752
954
1462
219
219
219
240
240
240
180
180
180
150
150
150
180
180
180
14
14
14
DN80*
DN80*
DN80*
130
130
130
200
200
200
8x18
8x18
8x18
40
40
40
85
98
121
10-32-3743-5
10-40-3743-6
10-60-3743-8
1232
1434
1942
608
810
1318
752
954
1462
273
273
273
265
265
265
250
250
250
180
180
180
220
220
220
14
14
14
DN100*
DN100*
DN100*
154
154
154
225
225
225
8x18
8x18
8x18
55
55
55
132
146
181
12-32-3744-5
12-40-3744-6
12-60-3744-8
1332
1534
2042
538
740
1248
738
940
1448
324
324
324
320
320
320
300
300
300
220
220
220
270
270
270
18
18
18
DN150*
DN150*
DN150*
204
204
204
280
280
280
8x18
8x18
8x18
55
55
55
190
208
262
Installation and Operating Instructions
Installation

The heat exchanger must be installed horizontally and levelled accurately, with the primary circuit (tubeside) being installed through the tubes and the secondary circuit (shellside) being installed over the tubes. The heat exchanger should only be connected in “counter flow” with the secondary circuit (shellside) connections always being positioned on top. (See schematic diagram below).

Alternative installations may also be acceptable; consultation with the technical department for acceptance should be made prior to installation. It is very important that the secondary circuit is fully vented via the vent plug fitted in order to prevent any aeration taking place which can cause corrosion of the tubes.

If ethylene glycol or any other heat transfer fluid is to be utilised within the secondary circuit, adequate mixing should be performed prior to filling of the heat exchanger.

If temperature control sensors are fitted to either the primary or secondary circuits of the heat exchanger, they should be fitted to the inlet circuit and not the outlet circuit in order to provide accurate temperature readings.

The pressure relief valve should not be removed or tampered with.

Operation

Adequate provision should be made to ensure that in the event of the primary circuit being shutdown, the secondary circuit continues to operate for a period of time to enable the dispersal of residual heat to an acceptable level, preventing any damage to the heat exchanger. Adequate provision should also be made to ensure that the secondary circuit pumps are in continual operation whenever the primary circuit is in operation. Provision should also be made to ensure that any valves or ancillary equipment associated to either the primary or secondary side of the heat exchanger can not be accidentally turned off, therefore preventing flow through the heat exchanger.